Patent Description:
With the development of hybrid electric vehicles, increasingly high requirement for the economy is raised by the users for hybrid electric vehicles. Due to the current hybrid system architecture and its policy, optimum energy consumption of the vehicles cannot be achieved. Therefore, the user's requirement for the economy of hybrid electric vehicles cannot be satisfied and the user's expectation cannot be met.

For example, due to the system architecture of the traditional range extended hybrid electric vehicles, the driving can only be realized by generating electricity by the electric generator driven by the engine and then supplying it to the driving motor. Therefore, even in a medium- or high-speed high-efficiency operating condition directly driven by the engine, energy conversion by the generator is necessitated, causing a large loss. This leads to the failure to achieve an optimum energy consumption in the medium- and high-speed operating conditions, and thus the low economy of the vehicles. <CIT> relates to a drive control method including acquiring an operation parameter of the vehicle and performing a drive control of the vehicle based on the operation parameter and an operation mode of the vehicle. <CIT> relates to a vehicle including an engine, a motor operating with electrical energy of a battery, an engine clutch for switching between an operation mode including an EV mode for transferring power generated by the motor to wheels and an HEV mode for transferring power generated by the engine and the motor to the wheels, and a controller. <CIT> relates to a mode transition control device for a hybrid vehicle, which prevents a second power generation system from overheating while traveling in a series HEV mode. <CIT> relates to an energy management control device for a hybrid vehicle.

According to the invention a control method for a hybrid vehicle, a computer-readable storage medium and a vehicle controller are provided as set out in the claims. The present invention is intended to solve one of the technical problems in related art at least to some extent. To this end, a first object of the present invention is to provide a control method for a hybrid vehicle, which enables the hybrid vehicle to operate with a low energy consumption in an operation mode of minimum equivalent fuel consumption according to the traveling parameters, thereby effectively improving the economy of the hybrid vehicle, and meeting the user's expectation during use.

A second object of the present invention is to provide a computer-readable storage medium.

A third object of the present invention is to provide a vehicle controller.

To achieve the above object, an embodiment according to a first aspect of the present invention provides a control method for a hybrid vehicle. The hybrid vehicle includes an engine, a driving motor, an electric generator, and a power battery. The engine is configured to selectively output power to a wheel end. The driving motor is configured to output power to the wheel end. The electric generator is connected to the engine and driven by the engine to generate electricity. The power battery is configured to supply electricity to the driving motor and be charged with an alternating current outputted by the electric generator or the driving motor, where the capacity of the power battery is greater than or equal to a first preset capacity. The control method includes the following steps: acquiring a traveling parameter of the hybrid vehicle, controlling the engine, the driving motor and the electric generator according to the traveling parameter, to enable the engine to operate in an economic zone by charging and discharging control of the power battery; and comparing the equivalent fuel consumptions when the hybrid vehicle is in a series mode, a parallel mode, and an EV mode, to select an operation mode of minimum equivalent fuel consumption as a current operation mode of the hybrid vehicle.

In the control method for a hybrid vehicle according to the embodiment of the present invention, a traveling parameter of the hybrid vehicle is acquired; the engine, the driving motor, and the electric generator are controlled according to the traveling parameter, to enable the engine to always operate in an economic zone when it is in an operating state, by charging and discharging control of the power battery; and the equivalent fuel consumptions when the hybrid vehicle is in the series mode, the parallel mode, and the EV mode are compared, to select an operation mode of minimum equivalent fuel consumption as a current operation mode of the hybrid vehicle. In this way, the hybrid vehicle is allowed to operate with a low energy consumption in an operation mode of minimum equivalent fuel consumption according to the traveling parameter, thereby effectively improving the economy of the hybrid vehicle, and meeting the user's expectation during use.

To achieve the above object, an embodiment according to a second aspect of the present invention provides a computer-readable storage medium storing a control program for the hybrid vehicle, when executed by a processor, implementing the control method for a hybrid vehicle as described above.

The computer-readable storage medium according to the embodiment of the present invention enables, by the control method for a hybrid vehicle as described above, the hybrid vehicle to operate with a low energy consumption in an operation mode of minimum equivalent fuel consumption according to the traveling parameter, thereby effectively improving the economy of the hybrid vehicle, and meeting the user's expectation during use.

To achieve the above object, an embodiment according to a third aspect of the present invention provides a vehicle controller, which includes: a memory, a processor, and a control program for a hybrid vehicle stored in the memory and executable on the processor. When the control program for a hybrid vehicle is executed by the processor, the control method for a hybrid vehicle as described above is implemented.

The vehicle controller according to the embodiment of the present invention enables, by the control method for a hybrid vehicle as described above, the hybrid vehicle to operate with a low energy consumption in an operation mode of minimum equivalent fuel consumption according to the traveling parameter, thereby effectively improving the economy of the hybrid vehicle, and meeting the user's expectation during use.

The additional aspects and advantages of the present invention will be provided in the following description, some of which will become apparent from the following description or may be learned from practices of the present invention.

<NUM> hybrid vehicle, <NUM> hybrid system, <NUM> engine, <NUM> driving motor, <NUM> electric generator, <NUM> power battery, <NUM> controller, <NUM> dual electronic controller module, <NUM> first inverter, <NUM> second inverter, <NUM> DC/DC, <NUM> transmission, <NUM> host reduction gear, C1 clutch, <NUM> vehicle controller, <NUM> memory, <NUM> processor.

The embodiments of the present invention will be described below in detail. Examples of the embodiments are shown in the accompanying drawings, and the same or similar reference numerals in all the accompanying drawings indicate the same or similar components or components having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and cannot be construed as a limitation on the present invention.

A hybrid system <NUM>, a hybrid vehicle <NUM> and a control method therefor, a vehicle controller <NUM> and a computer-readable storage medium according to the embodiments of the present invention will be described below with reference to accompanying drawings.

<FIG> is a schematic structural view of a hybrid system <NUM> for according to an embodiment of the present invention. As shown in <FIG>, the hybrid system <NUM> includes: an engine <NUM>, a driving motor <NUM>, an electric generator <NUM>, a power battery <NUM>, and a controller <NUM>.

The engine <NUM> is configured to selectively output power to a wheel end. The driving motor <NUM> is configured to output power to the wheel end. The electric generator <NUM> is connected to the engine <NUM>, and driven by the engine <NUM> to generate electricity. The power battery <NUM> is configured to supply electricity to the driving motor <NUM>, and be charged with an alternating current outputted by the electric generator <NUM> or the driving motor <NUM>, where the capacity of the power battery <NUM> is greater than or equal to a first preset capacity. The controller <NUM> is configured to acquire a traveling parameter of a hybrid vehicle <NUM>; control the engine <NUM>, the driving motor <NUM> and the electric generator <NUM> according to the traveling parameter, to enable the engine <NUM> to operate in an economic zone by charging and discharging control of the power battery <NUM>; and compare equivalent fuel consumptions when the hybrid vehicle <NUM> is in a series mode, a parallel mode, and an EV modes, to select an operation mode of minimum equivalent fuel consumption as a current operation mode of the hybrid vehicle <NUM>.

Particularly, the engine <NUM> can be an Atkinson cycle engine <NUM>, and a clutch C1 is provided between the engine <NUM> and the wheel end. The controller <NUM> controls the connection and disconnection of the engine <NUM> with and from the wheel end by controlling the disengagement and engagement of the clutch C1, so that the engine <NUM> can selectively output power to the wheel end. In this way, direct driving by the engine <NUM> is realized, that is, the engine <NUM> directly outputs power to the wheel end. For example, when the controller <NUM> controls the clutch C1 to disengage, the engine <NUM> is disconnected from the wheel end, and the engine <NUM> will out directly output power to the wheel end. When the controller <NUM> controls the clutch C1 to engage, the engine <NUM> is connected to the wheel end, and the engine <NUM> directly outputs power to the wheel end, to realize the direct driving by the engine <NUM>. Compared with the traditional range extended hybrid electric vehicles, the architecture has a direct driving path by the engine <NUM>, to avoid the loss caused by energy conversion in the traditional range extended hybrid electric vehicles where due to the lack of a direct driving path by the engine <NUM>, even though the engine <NUM> is highly efficient (the rotational speed and torque of the engine <NUM> are both efficient), the driving can only be realized by generating electricity by the electric generator <NUM> and then providing it to the driving motor <NUM>, and the further loss caused by energy conversion due to the frequent working of the power battery <NUM> in charging/discharging states, thus effectively improving the economy of the vehicle.

The driving motor <NUM> can be a hair-pin motor, in which rectangular coils are used for the stator winding, to improve the slot fullness of the stator slot, reduce the motor volume, and greatly improve the power density of the motor. The driving motor <NUM> is directly connected with the wheel end through a gear, and the controller <NUM> outputs power to the wheel end by controlling the driving motor <NUM> to operate. According to some embodiments of the present invention, the driving motor <NUM> is arranged in parallel to the electric generator <NUM>. Compared with other arrangements where for example, the driving motor <NUM> and the electric generator <NUM> are arranged coaxially, the parallel arrangement in this embodiment has a low design requirement for the motor, so that the large-power electric generator <NUM> can be easily arranged, and the cost is low.

The electric generator <NUM> can be a hair-pin motor, the electric generator <NUM> is connected between the clutch C1 and the engine <NUM>, and the electric generator <NUM> is directly connected with the engine <NUM> through a gear. The controller <NUM> controls the engine <NUM> to operate, which in turn drives the electric generator <NUM> to generate electricity. The generated electricity can be controlled by the controller <NUM> to charge the power battery <NUM> or power the driving motor <NUM>.

In some embodiments of the present invention, as shown in <FIG>, the hybrid system <NUM> further includes a transmission <NUM> and a host reduction gear <NUM>. As shown in <FIG>, the transmission <NUM> further includes gears Z1, Z2, Z3, and Z4. A central shaft of the gear Z1 is connected to one end of the clutch C1, the gear Z1 is engaged with the gear Z2, the gear Z2 is engaged with the gear Z3, and a central shaft of the gear Z3 is connected to the driving motor <NUM>. A central shaft of the gear Z2 is connected to a central shaft of the gear Z4, and the gear Z4 is engaged with a host reduction gear of the host reduction gear <NUM>. Of course, the transmission <NUM> can also have other structures, which is not limited herein.

The power battery <NUM> can be a blade battery. The power battery <NUM> is respectively electrically connected to the driving motor <NUM> and the electric generator <NUM>, and the power battery <NUM> is controlled by the controller <NUM> to power the driving motor <NUM>, or be charged with an alternating current outputted by the electric generator <NUM> or the driving motor <NUM>. That is, the power battery <NUM> can be charged by the electric generator <NUM> or the driving motor <NUM>. Moreover, the capacity of the power battery <NUM> is larger than or equal to a first preset capacity. For example, the first preset capacity is <NUM> kWh to <NUM> kWh. Due to the large capacity of the power battery <NUM>, the power battery <NUM> has a good buffering effect by using the charging and discharging of the power battery <NUM>, whereby the operation efficiency of the engine <NUM> can be adjusted, and the engine <NUM> can always operate in an economic zone when it is in an operating state. Otherwise, the operating efficiency of the engine <NUM> is low, and it will be in a non-operating state. The engine <NUM> operating in an economic zone means that the engine <NUM> always operates in the high-efficiency state. In this embodiment, the engine <NUM> operates in a state with a fuel efficiency of <NUM>% or higher. The large capacity of the power battery <NUM> enables the hybrid system <NUM> to run in the EV mode for a long time, and the operating time of the engine <NUM> becomes shorter, thus reducing the fuel consumption.

The controller <NUM> is respectively connected to the engine <NUM>, the driving motor <NUM>, the electric generator <NUM>, the power battery <NUM> and the clutch C1. The controller <NUM> can send a control signal to the engine <NUM>, the driving motor <NUM>, the electric generator <NUM>, the power battery <NUM>, and the clutch C1 so as to control them. The controller <NUM> acquires a traveling parameter of the hybrid vehicle <NUM>. According to some embodiments of the present invention, the traveling parameter includes at least one of a required wheel torque, SOC of the power battery <NUM>, and travel speed of the hybrid vehicle <NUM>. The required wheel torque is also the required vehicle torque. The controller <NUM> controls the engine <NUM>, the driving motor <NUM> and the electric generator <NUM> according to the traveling parameter, to enable the engine <NUM> to operate in an economic zone by charging and discharging control of the power battery <NUM>; and compares equivalent fuel consumptions when the hybrid vehicle <NUM> is in the series mode, the parallel mode, and the EV mode, to select an operation mode of minimum equivalent fuel consumption as a current operation mode of the hybrid vehicle <NUM>. It should be noted that the equivalent fuel consumptions are compared based on a situation where the engine <NUM> operates in the economic zone, for example, the engine <NUM> operates in an economic zone of <NUM> kW. However, combining the traveling parameter such as the required wheel torque, the fuel consumption in the parallel mode may be lower than the fuel consumption in the series mode, and also lower than the fuel consumption in the EV mode. In this case, the hybrid vehicle <NUM> is controlled to run in the parallel mode. If the fuel consumption in the EV mode is lower than the fuel consumption in the parallel mode and also lower than the fuel consumption in the series mode, the hybrid vehicle <NUM> is controlled to run in the EV mode. In addition, it is to be noted that the equivalent fuel consumption is a sum of the fuel consumed by the engine <NUM> itself and the fuel equivalent to the electricity consumed by the power battery <NUM>. The electricity consumed by the power battery <NUM> can be empirically converted into fuel to obtain the fuel equivalent to the electricity consumed by the power battery <NUM>. When the power battery <NUM> is charged, the fuel equivalent to the electricity consumed by the power battery <NUM> is a negative value. When the power battery <NUM> is discharged, the fuel equivalent to the electricity consumed by the power battery <NUM> is a positive value.

That is to say, considering the traveling parameter such as required wheel torque of the hybrid vehicle <NUM>, SOC of the power battery <NUM>, speed of the hybrid vehicle <NUM>, and equivalent fuel consumption of the hybrid vehicle <NUM> in various operating modes in combination, the controller <NUM> enables the hybrid vehicle <NUM> to operate in an operating mode with minimum equivalent fuel consumption while the power demand and Noise, Vibration, Harshness (NVH) are met. In this way, the equivalent fuel consumption of the hybrid vehicle <NUM> is minimum under all operating conditions, and the hybrid vehicle <NUM> has high economy. The series mode means that the power output between the engine <NUM> and the wheel end is cut off (that is, the clutch C1 is in a disengaged state), and the engine <NUM> drives the electric generator <NUM> to generate electricity and provide it to the driving motor <NUM>. In some cases, the engine <NUM> also charges excess energy to the power battery <NUM> by the electric generator <NUM>. The parallel mode means the power coupling between the engine <NUM> and the wheel end (that is, the clutch C1 is in an engaged state). In some cases, the engine <NUM> also charges excess energy to the power battery <NUM> by the driving motor <NUM>. The EV mode means that neither engine <NUM> nor electric generator <NUM> operates, and the power battery <NUM> supplies power to the driving motor <NUM>. When the hybrid vehicle <NUM> operates in the series mode, the parallel mode, or the EV mode, the engine <NUM> is controlled, by the charging and discharging control of the power battery <NUM>, to always operate in an economic zone during operation, and the equivalent fuel consumptions are compared based on a situation where the engine <NUM> is in an economic zone. In this way, the engine <NUM> is enabled to always operate in the economic zone under all operating conditions, and the equivalent fuel consumption of the hybrid vehicle <NUM> is minimum, thereby effectively improving the economy of the hybrid vehicle <NUM>. In this embodiment, by using the combined control and cooperation of the large-capacity power battery <NUM>, the engine <NUM>, the driving motor <NUM> and the electric generator <NUM>, the hybrid vehicle <NUM> is ensured to operate in an energy-saving mode.

In some embodiments of the present invention, when the hybrid vehicle <NUM> is in the series mode, the engine <NUM> charges the power battery <NUM> by the electric generator <NUM>. When the hybrid vehicle <NUM> is in the parallel mode, the engine <NUM> charges the power battery <NUM> by the driving motor <NUM>. In this embodiment, the engine <NUM> charges the power battery <NUM> by different motors in the series mode and parallel mode, to optimize the loss and reduce the energy consumption of the vehicle.

According to the present invention, when the engine <NUM> operates in the economic zone, the controller <NUM> is further configured to control the engine <NUM> to operate on an optimum economic line, when SOC of the power battery <NUM> is greater than or equal to a first preset value; or control the engine <NUM> to operate on the optimum economic line when SOC of the power battery <NUM> is less than the first preset value and the output power of the engine <NUM> is greater than or equal to a required wheel power. The first preset value inversely correlates with the first preset capacity.

Particularly, when the engine <NUM> operates in the economic zone, if SOC of the power battery <NUM> is greater than or equal to the first preset value, or SOC of the power battery <NUM> is less than the first preset value and the output power of the engine <NUM> is greater than or equal to the required wheel power, the controller <NUM> controls the engine <NUM> to operate on the optimum economic line.

That is to say, when the power battery <NUM> can supply a certain power, or the power of the power battery <NUM> is low, and the required wheel power is small at this time, the hybrid vehicle <NUM> can be enabled to operate on the optimum economic line. It should be noted that the engine <NUM> has at least one economic line in the economic zone, and one of these economic lines is an optimum economic line. The fuel consumption of the engine <NUM> corresponding to the optimum economic line is minimum. The fuel consumption of the hybrid vehicle <NUM> is caused to reach a minimum value by controlling the engine <NUM> to operate on the optimum economic line. In addition, it is to be noted that the first preset value inversely correlates with the first preset capacity. In practical use, the first preset value can be obtained by a look-up table method according to the first preset capacity, and the first preset value may be different in different modes. For example, the first preset value may be <NUM>% in the series mode, and the first preset value may be <NUM>% in the parallel mode. In this embodiment, the capacity of the power battery <NUM> is greater than or equal to the first preset capacity. The power battery <NUM> is a large-capacity battery, and the first preset value can be set to be extremely low. Even if SOC of the power battery <NUM> is low, the engine <NUM> also can operate on the optimum economic line. The setting of the capacity of the power battery <NUM> to be greater than or equal to the first preset capacity allows the engine <NUM> of the hybrid vehicle <NUM> to operate on the optimum economic line for a longer time.

In some embodiments of the present invention, when the hybrid vehicle <NUM> is in the parallel mode, the controller <NUM> is further configured to determine a required wheel torque. When the required wheel torque is less than the output torque when the engine <NUM> operates on the economic line, the engine <NUM> is controlled to operate on the economic line to respond to the required wheel torque, and the engine <NUM> is controlled to drive the driving motor <NUM> to generate electricity, so as to charge excess energy outputted by the engine <NUM> to the power battery <NUM> by the driving motor <NUM>. When the required wheel torque is greater than the output torque when the engine <NUM> operates on the economic line, the engine <NUM> is controlled to operate on the economic line, and the power battery <NUM> is controlled to power the driving motor <NUM>, so both the power battery <NUM> and the engine <NUM> respond to the required wheel torque.

It should be noted that the process occurs in the parallel mode of the hybrid vehicle <NUM>. In the parallel mode, the large-capacity power battery <NUM> can be used to supplement the torque or take in excess torque, that is, the power battery <NUM> plays a buffering role, so that the engine <NUM> can operate in the high-efficiency economic zone for a longer time, and the equivalent fuel consumption of the hybrid vehicle <NUM> in the parallel mode is minimum, thus making the hybrid vehicle <NUM> more economical.

Particularly, the controller <NUM> can control the clutch C1 to engage, to cause power coupling between the engine <NUM> and the wheel end; and control the engine <NUM> to operate, to allow the hybrid vehicle <NUM> to enter a parallel mode. In the parallel mode, the controller <NUM> acquires the required wheel torque, and compares it with the output torque when the engine <NUM> operates on the economic line.

If the required wheel torque is less than or equal to the output torque when the engine <NUM> operates on the economic line, the engine <NUM> is controlled to operate on the economic line, to meet the power demand. Meanwhile, the controller <NUM> controls the engine <NUM> to drive the driving motor <NUM> generate electricity and the electric generator <NUM> to be idle, so that excess energy outputted by the engine <NUM> is charged to the power battery <NUM> by the driving motor <NUM>. At this time, the hybrid vehicle <NUM> enters a parallel electricity generation mode in the parallel mode. That is, the parallel mode includes the parallel electricity generation mode. The parallel electricity generation is to generate electricity by the driving motor <NUM>. The power of the driving motor <NUM> is larger, so the power supplementing rate is higher; and the loss when the electric generator <NUM> is idle is less than the loss when the driving motor <NUM> is idle, so the energy saving effect is better. Therefore, the driving motor <NUM> is used for electricity generation in the mode, thereby further improving the economy of the vehicle. Moreover, excess energy outputted by the engine <NUM> is charged to the power battery <NUM>, so the power in the power battery <NUM> increase accordingly, and the vehicle can operate in the EV mode for a longer time, with a better economy.

If the required wheel torque is greater than the output torque when the engine <NUM> operates on the economic line, the engine <NUM> is controlled to operate on the economic line, and the power battery <NUM> is controlled to power the driving motor <NUM>. At this time, both the power battery <NUM> and the engine <NUM> provide the required wheel torque, to meet the power demand; and the hybrid vehicle <NUM> enters a parallel assisting mode in the parallel mode.

Therefore, when the hybrid vehicle <NUM> is in the parallel mode, the power battery <NUM> plays a buffering role, such that the operating area of the engine <NUM> is in an economic zone (that is, on the economic line) on the efficiency curve diagram, and the engine <NUM> is ensured to always operate in the economic zone. As a result, the hybrid vehicle <NUM> has high economy. In this embodiment, the capacity of the power battery <NUM> is greater than or equal to the first preset capacity. The large-capacity power battery <NUM> can play a buffering role to supplement the torque or take in excess torque when the engine <NUM> operates.

In some other embodiments of the present invention, when the hybrid vehicle <NUM> is in the series mode, the controller <NUM> is further configured to determine a required wheel power according to the required wheel torque and speed of the vehicle; control the engine <NUM> to operate on an economic line, so as to drive the electric generator <NUM> to generate electricity according to a output torque when the engine <NUM> operates on the economic line and output power to the wheel end by the driving motor <NUM>; charge excess power to the power battery <NUM> by the electric generator <NUM> when the electricity generation power of the electric generator <NUM> is greater than the required wheel power; and control the power battery <NUM> to power the driving motor <NUM>, so both the engine <NUM> and the power battery <NUM> respond to the required wheel power, when the electricity generation power of the electric generator <NUM> is less than the required wheel power.

It should be noted that the process occurs in the series mode of the hybrid vehicle <NUM>. In the series mode, the large-capacity power battery <NUM> can be used to supplement the power or take in excess power, that is, the power battery <NUM> plays a buffering role, so that the engine <NUM> can operate in the high-efficiency economic zone for a longer time, thus making the hybrid vehicle <NUM> more economical.

Particularly, the controller <NUM> can control the clutch C1 to disengage, to cut off the power output between the engine <NUM> and the wheel end; and the engine <NUM> drives the electric generator <NUM> to generate electricity and the power is outputted by the driving motor <NUM> to the wheel end, to allow the hybrid vehicle <NUM> to enter the series mode. In the series mode, the controller <NUM> controls the engine <NUM> to operate on the economic line, acquires a required wheel torque and speed of the hybrid vehicle <NUM>, acquires a required wheel power according to the required wheel torque and speed of the hybrid vehicle <NUM> (specifically by a method in related art, which is not limited herein), and compares the required wheel power with the electricity generation power of the electric generator <NUM>. The electricity generation power of the electric generator <NUM> is a power outputted when the electric generator <NUM> is driven to generate electricity by the torque outputted by the engine <NUM> operating on the economic line. Excess power is charged to the power battery <NUM> by the electric generator <NUM> if the electricity generation power of the electric generator <NUM> is greater than the required wheel power. The power battery <NUM> is controlled to power the driving motor <NUM>, so both the engine <NUM> and the power battery <NUM> provides the required wheel power, if the electricity generation power of the electric generator <NUM> is less than or equal to the required wheel power.

It should be noted that power is compared in the series mode, so as to avoid the control deviation caused by the incompletely efficiently following by the electricity generation and driving power when torque comparison is adopted.

Therefore, when the hybrid vehicle <NUM> is in the series mode, the power battery <NUM> plays a buffering role, such that the operating area of the engine <NUM> is in an economic zone (that is, on the economic line) on the efficiency curve diagram, and the engine <NUM> is ensured to always operate in the economic zone. As a result, the hybrid vehicle <NUM> has high economy. In this embodiment, the capacity of the power battery <NUM> is greater than the first preset capacity. The large-capacity power battery <NUM> can play a buffering role to supplement the power or take in excess power when the engine <NUM> operates.

In some embodiments of the present invention, the controller <NUM> is further configured to determine, when the speed of the hybrid vehicle <NUM> is greater than or equal to a preset vehicle speed threshold, a first wheel torque threshold entering the parallel mode and a second wheel torque threshold exiting the parallel mode of the hybrid vehicle <NUM> according to SOC of the power battery <NUM> and the speed of the hybrid vehicle <NUM>, and control the hybrid vehicle <NUM> to enter the parallel mode when the required wheel torque is greater than or equal to the first wheel torque threshold and less than or equal to the second wheel torque threshold; control the engine <NUM> to operate on the economic line, and control the power battery <NUM> to power the driving motor <NUM>, so both the engine <NUM> and the power battery <NUM> respond to the required wheel torque, when the required wheel torque is greater than the output torque when the engine <NUM> operates on the economic line; control the engine <NUM> to operate on the economic line to respond to the required wheel torque, and control the engine <NUM> to drive the driving motor <NUM> to generate electricity, so as to charge excess energy outputted by the engine <NUM> to the power battery <NUM> by the driving motor <NUM>, if the required wheel torque is less than the output torque when the engine <NUM> operates on the economic line; and control the engine <NUM> to operate on the economic line, to respond to the required wheel torque independently, if the required wheel torque is equal to the output torque when the engine <NUM> operates on the economic line, where the first wheel torque threshold is less than the second wheel torque threshold.

That is, the operating mode of the hybrid vehicle <NUM> can be determined according to the required wheel torque of the hybrid vehicle <NUM>, SOC of the power battery <NUM>, and speed of the hybrid vehicle <NUM>, to ensure that the hybrid vehicle <NUM> operates in a mode with minimum equivalent fuel consumption, and achieve the purpose of energy saving.

Particularly, during the traveling of the hybrid vehicle <NUM>, the controller <NUM> acquires the speed of the hybrid vehicle <NUM> and compares it with a preset vehicle speed threshold (e.g. <NUM>/h). When the speed of the hybrid vehicle <NUM> is greater than or equal to the preset vehicle speed threshold, the controller <NUM> can determine a first wheel torque threshold T1 entering the parallel mode and a second wheel torque threshold T2 exiting the parallel mode of the hybrid vehicle <NUM> by a look-up table method according to SOC of the power battery <NUM> and speed of the hybrid vehicle <NUM>. Then, the controller <NUM> acquires a required wheel torque of the hybrid vehicle <NUM>, and compares it with the first wheel torque threshold T1 and the second wheel torque threshold T2. When the required wheel torque is greater than or equal to the first wheel torque threshold T1 and less than or equal to the second wheel torque threshold T2, the controller <NUM> controls the clutch C1 to engage, to cause power coupling between the engine <NUM> and the wheel end, so as to allow the hybrid vehicle <NUM> to enter the parallel mode.

After the hybrid vehicle <NUM> enters the parallel mode, if the required wheel torque is greater than the output torque when the engine <NUM> operates on the economic line, the controller <NUM> control the engine <NUM> to operate on the economic line, and control the power battery <NUM> to power the driving motor <NUM>. Both the engine <NUM> and the power battery <NUM> provide the required wheel torque. At this time, the hybrid vehicle <NUM> enters the parallel assisting mode in the parallel mode. If the required wheel torque is less than the output torque when the engine <NUM> operates on the economic line, the controller <NUM> controls the engine <NUM> to operate on the economic line, so as to provide the required wheel torque; and control the engine <NUM> to drive the driving motor <NUM> to generate electricity, so as to charge excess energy outputted by the engine <NUM> to the power battery <NUM> by the driving motor <NUM>. At this time, the hybrid vehicle <NUM> enters the parallel electricity generation mode in the parallel mode. If the required wheel torque is equal to the output torque when the engine <NUM> operates on the economic line, the controller <NUM> controls the engine <NUM> to operate on the economic line, so as to provide the required wheel torque independently. At this time, the hybrid vehicle <NUM> enters the parallel direct-driving mode in the parallel mode.

Therefore, the hybrid vehicle <NUM> is controlled to enter the parallel mode according to the required wheel torque of the hybrid vehicle <NUM>, SOC of the power battery <NUM>, and speed of the hybrid vehicle <NUM>, and different modes in the parallel mode are used, such that the engine <NUM> always operates in the economic zone, thereby achieving the object of energy saving, and ensuring the high economy of the hybrid vehicle <NUM>. Moreover, the hybrid vehicle <NUM> can operate in the parallel direct-driving mode. In contrast, in the traditional range extended hybrid electric vehicles, due to the lack of a direct driving path by the engine <NUM>, even in a medium- or high-speed high-efficiency operating condition directly driven by the engine <NUM>, the driving can only be realized by generating electricity and then providing it to the driving motor <NUM>, which necessitates the energy conversion by the electric generator <NUM>, causing loss due to energy conversion. The power battery <NUM> frequently works in charging/discharging states, further causing loss due to energy conversion. In the present invention, the hybrid vehicle <NUM> can operates in the parallel direct-driving mode, to effectively avoid the loss above, thereby improving the economy of the hybrid vehicle <NUM>. It can be understood that in this embodiment, at the current required wheel torque, the current SOC and the current vehicle speed, more energy can be saved when the hybrid vehicle <NUM> operates in the parallel mode than in the series mode and the EV mode.

According to some embodiments of the present invention, the first wheel torque threshold T1 and the second wheel torque threshold T2 positively correlate with SOC of the power battery <NUM>. That is to say, the first wheel torque threshold T1 and the second wheel torque threshold T2 vary with varying SOC of the power battery <NUM>, so as to achieve power reservation of the power battery <NUM> while energy saving is ensured. Moreover, when SOC of the power battery <NUM> is low, the engine <NUM> is caused to operate as much as possible; and when SOC of the power battery <NUM> is high, the vehicle is caused to operate in the EV mode as much as possible, so as to allow the vehicle to have good NVH performance while energy saving is ensured. In practical use, the first wheel torque threshold T1 and the second wheel torque threshold T2 can be acquired by a look-up table method according to SOC of the power battery <NUM>, as shown in Table <NUM>:.

SOC1 and SOC2 are preset values and SOC1 < SOC2; T11<T12<T13, T21<T22<T23.

According to some embodiments of the present invention, when the hybrid vehicle <NUM> operates in the parallel mode, the vehicle speed where the engine <NUM> is involved in the operation inversely correlates with SOC of the power battery <NUM>. That is to say, in the parallel mode, the vehicle speed where the engine <NUM> is involved in the operation varies with varying SOC of the power battery <NUM>, so as to reduce the duration of the parallel mode as much as possible, and allow the power battery <NUM> to discharge to power the driving motor <NUM> as much as possible. That is, electricity is used as much as possible, and the vehicle operates in the EV mode as much as possible. In practical use, the vehicle speed V where the engine <NUM> is involved in the operation can be acquired by a look-up table method according to SOC of the power battery <NUM>, as shown in Table <NUM>:.

SOC1 and SOC2 are preset values, and SOC1<SOC2, V3<V2<V1.

In some embodiments of the present invention, the controller <NUM> is further configured to, when the required wheel torque is less than the first wheel torque threshold T1, control the engine <NUM> to stop operation and control the power battery <NUM> to power the driving motor <NUM>, so as to respond to the required wheel torque by the power battery <NUM>.

It should be noted that this process occurs in the EV mode, that is, a solely electric mode, of the hybrid vehicle <NUM>. When the hybrid vehicle <NUM> operates in the EV mode, the engine <NUM> is not required to be involved in the operation. At this time, the fuel consumption rate is zero, and the efficiency of the hybrid vehicle <NUM> can be up to <NUM>% or more, so the vehicle has high economy. Particularly, when the required wheel torque is less than the first wheel torque threshold T1, the controller <NUM> controls the clutch C1 to disengage, to cut off the power output between the engine <NUM> and the wheel end, controls the engine <NUM> and the electric generator <NUM> to stop operation, and controls the power battery <NUM> to power the driving motor <NUM>, where the required wheel torque is provided by the driving motor <NUM>. At this time, the hybrid vehicle <NUM> enters the EV mode, that is, the solely electric mode. It is to be understood that in this embodiment, at the current required wheel torque, current SOC and current vehicle speed, more energy is saved when the hybrid vehicle <NUM> operates in the EV mode. Therefore, the operating mode of the vehicle is switched from the parallel mode to the EV mode.

Therefore, the hybrid vehicle <NUM> is controlled to enter the EV mode according to the required wheel torque of the hybrid vehicle <NUM>, SOC of the power battery <NUM>, and speed of the hybrid vehicle <NUM>. Due to the high efficiency in the EV mode, the purpose of energy saving is achieved, and the hybrid vehicle <NUM> is ensured to have high economy.

In some embodiments of the present invention, the controller <NUM> is further configured to, when the required wheel torque is greater than the second wheel torque threshold T2, control the hybrid vehicle <NUM> to enter the series mode; determine a required wheel power according to the required wheel torque and the vehicle speed; control the engine <NUM> to operate at a preset power at an optimum economic point, so as to drive the electric generator <NUM> to generate electricity according to the preset power when the engine <NUM> operates at the optimum economic point and output power to the wheel end by the driving motor <NUM>; charge excess power to the power battery <NUM> by the electric generator <NUM> when the electricity generation power of the electric generator <NUM> is greater than the required wheel power; and control the engine <NUM> to increase the output power, and control the engine <NUM> to operate on the economic line of the engine <NUM>, so as to respond to the required wheel power, when the electricity generation power of the electric generator <NUM> is less than the required wheel power.

Particularly, when the required wheel torque is greater than the second wheel torque threshold T2, the controller <NUM> controls the clutch C1 to disengage, to cut off the power output between the engine <NUM> and the wheel end; and the engine <NUM> drives the electric generator <NUM> to generate electricity and the power is outputted by the driving motor <NUM> to the wheel end, to allow the hybrid vehicle <NUM> to enter the series mode. In the series mode, the controller <NUM> controls the engine <NUM> to operate at a preset power (for example, <NUM> kW) at the optimum economic point, acquires the required wheel torque and the vehicle speed, determine the required wheel power according to the required wheel torque and the vehicle speed, and compare it with the electricity generation power of the electric generator <NUM>. The controller <NUM> controls the electric generator <NUM> to charge excess power to the power battery <NUM> if the electricity generation power of the electric generator <NUM> is greater than the required wheel power. The controller <NUM> controls the engine <NUM> to increase the output power and control the engine <NUM> to operate on the economic line of the engine <NUM> if the electricity generation power of the electric generator <NUM> is less than the required wheel power.

Therefore, the hybrid vehicle <NUM> is controlled to enter the series mode according to the required wheel torque of the hybrid vehicle <NUM>, SOC of the power battery <NUM>, and speed of the hybrid vehicle <NUM>, and different modes in the series mode are used, such that the engine <NUM> always operates in the economic zone, thereby achieving the object of energy saving, and ensuring the high economy of the hybrid vehicle <NUM>. It is to be understood that in this embodiment, at the current required wheel torque, current SOC and current vehicle speed, more energy is saved when the hybrid vehicle <NUM> operates in the series mode. Therefore, the operating mode of the vehicle is switched from the parallel mode to the series mode, and the engines <NUM> always operates on the economic line, and particularly, is switched from the economic line in the parallel mode to the economic line in the series mode.

According to some embodiments of the present invention, the controller <NUM> is further configured to, when the electricity generation power of the electric generator <NUM> is less than the required wheel power, determine whether the current SOC of the power battery <NUM> is less than a second preset value (for example, <NUM>%, and <NUM>%, etc.), control the engine <NUM> to further increase the output power if yes, so as to control the output power of the engine <NUM> to respond to the required wheel power, and charge the power battery <NUM> by the electric generator <NUM>.

That is to say, when the electricity generation power of the electric generator <NUM> is less than the required wheel power and current SOC of the power battery <NUM> is less than the second preset value, namely, SOC of the power battery <NUM> is extremely low, the engine <NUM> will increase the output power while the driving demand is met. That is, the operating point of the engine <NUM> on the economic line moves toward a direction with increasing output torque. Some energy is transferred to the power battery <NUM>, to charge the power battery <NUM>. As a result, the power in the power battery <NUM> is supplemented while the engine <NUM> is driven in an energy saving mode.

It should be noted that the heat efficiency is the highest when the engine <NUM> operates at the optimum economic point. As shown in <FIG>, when the output power of the engine <NUM> is <NUM> kW, the corresponding heat efficiency is <NUM>%. Therefore, after the engine <NUM> is activated, when the required wheel power is less than the electricity generation power of the electric generator <NUM>, the engine <NUM> will drive the electric generator <NUM> to generate electricity at a power corresponding to the optimum economic point, and the excess energy is transferred to the power battery <NUM> after the wheel end is driven by the driving motor <NUM>. If the required wheel power is greater than the electricity generation power of the electric generator <NUM>, the engine <NUM> will drive at a power greater than the power corresponding to the optimum economic point following the required wheel power on a high-efficiency economic line of the engine <NUM>. That is, the engine <NUM> operates on the economic line of the engine <NUM>, but outputs more power. According to some embodiments of the present invention, if the required wheel power is greater than the electricity generation power of the electric generator <NUM> and SOC of the power battery <NUM> is low to a certain value, the engine <NUM> will further increase the power, to meet the power demand, and allow some energy to enter the power battery <NUM> for charging the power battery <NUM>. That is to say, the engine <NUM> will increase the output power while the driving demand is met, so as to supply some energy to the power battery <NUM>. When SOC of the power battery <NUM> is increased to a certain value, the controller <NUM> will control the engine <NUM> to stop operation, and the EV mode is entered. In this manner, the solely electric traveling of the hybrid vehicle <NUM> can account for <NUM>% under an electricity-deficient operating condition as shown in <FIG>, thereby ensuring that the hybrid vehicle <NUM> has high economy. The typical electricity-deficient operating condition is an electricity-deficient operating condition in an urban scenario, including frequent start and stop of vehicles, vehicle-following congestion, and medium and low vehicle speed with strict NVH restrictions.

In some embodiments of the present invention, the controller <NUM> is further configured to, when the speed of the hybrid vehicle <NUM> is less than a preset vehicle speed threshold, according to SOC of the power battery <NUM> and the vehicle speed, determine a third wheel torque threshold T3 entering the series mode of the hybrid vehicle <NUM>, and control the hybrid vehicle <NUM> to enter the series mode when the required wheel torque is greater than or equal to the third wheel torque threshold T3; determine a required wheel power according to the required wheel torque and the vehicle speed; control the engine <NUM> to operate at a preset power at an optimum economic point, so as to drive the electric generator <NUM> to generate electricity according to the preset power when the engine <NUM> operates at the optimum economic point and output power to the wheel end by the driving motor <NUM>; charge excess power to the power battery <NUM> by the electric generator <NUM> when the electricity generation power of the electric generator <NUM> is greater than the required wheel power; and control the engine <NUM> to increase the output power, and control the engine <NUM> to operate on the economic line of the engine <NUM>, so as to respond to the required wheel power, when the electricity generation power of the electric generator <NUM> is less than the required wheel power.

According to some embodiments of the present invention, the controller <NUM> is further configured to, when the required wheel torque is less than the third wheel torque threshold, control the engine <NUM> to stop operation and control the power battery <NUM> to power the driving motor <NUM>, so as to respond to the required wheel torque by the power battery <NUM>. It is to be understood that in this embodiment, at the current required wheel torque, current SOC and current vehicle speed, more energy is saved when the hybrid vehicle <NUM> operates in the EV mode. Therefore, the operating mode of the vehicle is switched from the series mode to the EV mode.

That is to say, when the speed of the hybrid vehicle <NUM> is small, for example, less than <NUM>/h, the hybrid vehicle <NUM> is controlled to enter the series mode or EV mode according to SOC of the power battery <NUM> and the vehicle speed. That is, at a low vehicle speed, the parallel mode cannot be entered due to the hardware limitation. In this case, the equivalent energy consumptions in the series mode and the EV mode are compared, to reduce the system computation, reduce the requirement for the processing speed of the controller <NUM>, make the processing speed faster, reduce the use of high-speed processing chips, and save the cost.

Particularly, when the vehicle speed of the hybrid vehicle <NUM> is less than a preset vehicle speed threshold (for example, <NUM>/h), a third wheel torque threshold T3 entering the series mode of the hybrid vehicle <NUM> is determined by a look-up table method according to SOC of the power battery <NUM> and the vehicle speed, and compared with the required wheel torque.

The controller <NUM> controls the hybrid vehicle <NUM> to enter the series mode, when the required wheel torque is greater than or equal to the third wheel torque threshold T3. In the series mode, the controller <NUM> controls the engine <NUM> to operate at a preset power (for example, <NUM> kW) at the optimum economic point, acquires the required wheel torque and the vehicle speed, determine the required wheel power according to the required wheel torque and the vehicle speed, and compare it with the electricity generation power of the electric generator <NUM>. The controller <NUM> controls the electric generator <NUM> to charge excess power to the power battery <NUM> if the electricity generation power of the electric generator <NUM> is greater than the required wheel power. The controller <NUM> controls the engine <NUM> to increase the output power and control the engine <NUM> to operate on the economic line of the engine <NUM> to provide the required wheel power, if the electricity generation power of the electric generator <NUM> is less than the required wheel power. According to some embodiments of the present invention, when the electricity generation power of the electric generator <NUM> is less than the required wheel power and the current SOC of the power battery <NUM> is less than the second preset value, the engine <NUM> will increase the output power while the driving demand is met, and some energy will be transferred to the power battery <NUM> to supplement the power in the power battery <NUM>.

When the required wheel torque is less than the third wheel torque threshold T3, the controller <NUM> controls the engine <NUM> to stop operation, and controls the power battery <NUM> to power the driving motor <NUM>, where the required wheel torque is provided by the power battery <NUM>. At this time, the hybrid vehicle <NUM> enters the EV mode.

Therefore, the hybrid vehicle <NUM> is controlled to enter the series mode according to the required wheel torque of the hybrid vehicle <NUM>, SOC of the power battery <NUM>, and speed of the hybrid vehicle <NUM>, and different modes in the series mode are used, such that the engine <NUM> always operates in the economic zone, thereby achieving the object of energy saving, and ensuring the high economy of the hybrid vehicle <NUM>. According to some embodiments of the present invention, the third wheel torque threshold T3 positively correlate with SOC of the power battery <NUM>. That is to say, the third wheel torque threshold T3 varies with varying SOC of the power battery <NUM>, so as to reduce the duration of the series mode as much as possible, and allow the power battery <NUM> to discharge to power the driving motor <NUM> as much as possible. That is, electricity is used as much as possible, and the vehicle operates in the EV mode as much as possible. In practical use, the third wheel torque threshold T3 can be acquired by a look-up table method according to SOC of the power battery <NUM>, as shown in Table <NUM>:.

SOC1 and SOC2 are preset values, and SOC1<SOC2, T31<T32<T33.

In some embodiments of the present invention, as shown in <FIG>, the controller <NUM> is further configured to, when the hybrid vehicle <NUM> operates in the series mode, control the engine <NUM> to operate on a first economic line if SOC of the power battery <NUM> is in a first preset interval; and control the engine <NUM> to operate on a second economic line if SOC of the power battery <NUM> is in a second preset interval. An upper limit of the second preset interval is less than or equal to a lower limit of the first preset interval. The first economic line is the optimum economic line of the series mode. At the same rotational speed, the output torque when the engine <NUM> operates on the second economic line is greater than or equal to the output torque when the engine <NUM> operates on the first economic line. In this embodiment, the second economic line can basically coincide with an external characteristic line of the engine <NUM>, or set between the first economic line and the external characteristic line of the engine <NUM>. The first preset interval can be such that SOC of the power battery <NUM> is greater than or equal to <NUM>%, and the second preset interval can be such that SOC of the power battery <NUM> is less than <NUM>%.

In some embodiments of the present invention, as shown in <FIG>, the controller <NUM> is further configured to, when the hybrid vehicle <NUM> operates in the parallel mode, control the engine <NUM> to operate on a third economic line if SOC of the power battery <NUM> is in a third preset interval; control the engine <NUM> to operate on a fourth economic line if SOC of the power battery <NUM> is in a fourth preset interval; and control the engine <NUM> to operate on a fifth economic line if SOC of the power battery <NUM> is in a fifth preset interval. An upper limit of the fifth preset interval is less than or equal to a lower limit of the fourth preset interval, and an upper limit of the fourth preset interval is less than or equal to a lower limit of the third preset interval. The third economic line is the optimum economic line in the parallel mode. The fifth economic line basically coincide with an external characteristic line of the engine <NUM>, and the fourth economic line is located between the fifth economic line and the third economic line. The third preset interval may be such that SOC of the power battery <NUM> is greater than or equal to <NUM>%, the fourth preset interval may be such that SOC of the power battery <NUM> is greater than <NUM>% and less than <NUM>%, and the fifth preset interval may be such that SOC of the power battery <NUM> is less than or equal to <NUM>%. That is to say, the optimum operating mode of the engine <NUM> is always operation on the economic lines, and not operation in an economic area between economic lines. The economic zone in the present invention may be two economic lines in the series mode or three economic lines in the parallel mode in the economic zone, as described above. The present invention is not limited thereto, and the description is merely exemplary here. In other words, the economic line on which the engine <NUM> operates is movable. Therefore, when the hybrid vehicle <NUM> operates at a low SOC of the power battery <NUM>, power reservation of the power battery <NUM> is achieved by adjusting the economic line on which the engine <NUM> operates, and improving the fraction of the engine <NUM> involved in the driving and the output torque. The economic lines of the engine <NUM> in the parallel mode and the series mode are different, to achieve a low comprehensive fuel consumption of the hybrid vehicle <NUM>.

In summary, a series mode and a parallel mode are set for the hybrid vehicle <NUM> according to the embodiment of the present invention, to achieve the high-efficiency operation of the engine <NUM> in the whole range from low- to medium- and high-speed operating conditions. Under medium- and high-speed operating conditions, the engine <NUM> is determined to operate in the parallel mode or the series mode according to the traveling parameter. Under low-speed operating conditions, the timing at which the engine <NUM> enters the series mode is determined according to the traveling parameter. Therefore, the probability of the engine <NUM> operating on the optimum economic line is increased, and the engine <NUM> always operates in the economic zone, to achieve energy saving.

In some embodiments of the present invention, the controller <NUM> is further configured to determine SOC of the power battery <NUM>; and control the hybrid vehicle <NUM> to operate in the series mode or the parallel mode and the engine <NUM> to operate in the economic zone, according to SOC of the power battery <NUM>, the vehicle speed, the required wheel torque, when SOC of the power battery <NUM> is less than a third preset value. That is to say, when SOC of the power battery <NUM> is less than a third preset value (for example, <NUM>%), the hybrid vehicle <NUM> is controlled to enter the series mode or the parallel mode according to SOC of the power battery <NUM>, the vehicle speed and the required wheel torque, and the engine <NUM> is controlled to operate in the economic zone when the hybrid vehicle <NUM> operates in the series mode or the parallel mode, thereby avoiding the fast power drop in the case of electricity-deficient operating conditions when the hybrid vehicle <NUM> operates in the EV mode, and ensuring power reservation of the power battery <NUM>.

In a specific example, the controller <NUM> can be configured to control the hybrid vehicle <NUM> according to a control logic shown in <FIG> and <FIG>, which specifically includes the following steps:.

According to some embodiments of the present invention, a corresponding control policy is schematically shown in <FIG>. As can be seen from <FIG>, when SOC of the power battery <NUM> is high (for example, SOC is ≥<NUM>%), the vehicle travels solely relying on electricity in most time, that is, the fraction of operating zone in the EV mode is higher than that of the operating zone in the series mode. Under the medium- and high-speed operating conditions, direct driving by the engine <NUM> dominates, and the engine <NUM> operates on the optimum economic line. At the same time, the driving motor <NUM> assists to meet the wheel demand, that is, the vehicle enters the parallel assisting mode. Only in the case of large power demand, the vehicle enters the series electricity-generation mode to meet the wheel demand.

As shown in FIG. 7b, and FIG. 7c, as SOC of the power battery <NUM> decreases, the operating zone in the EV mode decreases, and the operating zone in the series mode increases. After entering direct driving by the engine <NUM> by traveling at a medium or high speed, the assisting torque of the driving motor <NUM> decreases, to slow down the descending rate of SOC of the power battery <NUM>, and achieve power reservation of the power battery <NUM>. In the parallel mode, when the speed at which the engine <NUM> is involved in the operation is higher relative to SOC of the power battery <NUM>, the involving speed is smaller and closer to the preset vehicle speed threshold.

When SOC of the power battery <NUM> is extremely low (for example, SOC is ≤<NUM>%), to increase the power reservation of the power battery <NUM> of the vehicle, the vehicle does not travel solely relying on electricity any more, and series driving is employed at a low speed. In the series mode, the engine <NUM> will drive the electric generator <NUM> to generate some more electricity that is supplemented to the power battery <NUM>. The zone of direct driving by the engine <NUM> at a high speed decreases. After the engine <NUM> enters direct drying, some more electricity will be generated and supplemented to the power battery <NUM>.

Therefore, by determining SOC of the power battery <NUM>, and in the descending process of SOC, the priority of power reservation of the vehicle is persistently improved, and the operating zone in the EV mode is continuously reduced. The series driving includes series power following (when SOC of the power battery <NUM> is low) and series constant power (when SOC of the power battery <NUM> is high) according to different SOC of the power battery <NUM>. In the case of series power following, the operating point of the engine <NUM> follows the economic line of the engine <NUM>; and when SOC of the power battery <NUM> is extremely low, the output power of the engine <NUM> will respond to the required wheel power, and charge the power battery <NUM> as well. In the case of series constant power, the engine <NUM> will operate at a high-efficiency economic point (for example, <NUM> kW). If the required wheel torque cannot be met solely by driving by the engine <NUM>, the power battery <NUM> outputs some energy, and the driving motor <NUM> is driven by both the power battery <NUM> and the engine <NUM>. It can be understood that <NUM> KW is an exemplary economic point in this embodiment.

For example, when SOC is high and the vehicle speed is high, the wheel demand is small. Atthis time, the parallel mode is mainly employed, that is, direct driving by the engine <NUM> dominates. In the mode, the economy is good, and the energy consumption is low. For example, the electrically equivalent fuel consumption in the EV mode alone is tested to be about <NUM> times the fuel consumption of the engine <NUM> operating in the economic zone; Moreover, the NVH performance is good. For example, when the vehicle speed is <NUM>/h, the rotational speed of the engine <NUM> in the parallel mode is about <NUM> rpm, and the rotational speed of the engine <NUM> is greater than <NUM> rpm if the series electricity-generation mode is employed. Furthermore, the power reservation is good. For example, in this mode, the power battery <NUM> does not discharge to the outside, and SOC of the power battery <NUM> basically does not drop. However, if the EV mode is employed, the power battery <NUM> will discharge to the outside, and SOC of the power battery <NUM> drops quickly. The power battery <NUM> has large capacity, high discharge power, and long solely electricity-relaying traveling range, leading to a good NVH performance of the vehicle traveling solely relying on electricity for a long time. The engine <NUM> and the driving motor <NUM> operates in a high efficiency interval, resulting in a low energy consumption of the vehicle.

At about the balance point of SOC of the power battery <NUM> or in the case of vehicle following at a low vehicle speed or under traffic congestion conditions, the EV mode is mainly adopted. In the mode, the economy is good. For example, the efficiency of the driving motor <NUM> is high. If the series electricity-generation mode is employed, the operation of the engine <NUM> in a low-efficiency zone cannot be avoided, and the electricity generation efficiency of the engine <NUM> is low. Moreover, the NVH performance is good in the EV mode. For example, there is no start noise of the engine <NUM> in this mode, and the quietness is good. If the series mode is used, the engine <NUM> will rotate at a speed of <NUM> rpm-<NUM> rpm, and the experience is slightly worse.

At low SOC and large required wheel torque (such as large throttle acceleration or high driver demand), the series mode is mainly adopted, in which the power performance is good. For example, in the case of insufficient discharge capacity of the power battery <NUM>, the engine <NUM> has powerful electricity generation power, to meet the driver's demand for acceleration and overtaking. In addition, the power reservation performance is good. For example, in this mode, when the discharge capacity of the power battery <NUM> is insufficient, the engine <NUM> can generate electricity according to the driver's demand. If the parallel assisting mode is used, because the engine <NUM> is directly connected to the wheel end and the driving demand cannot be met when the engine <NUM> operates in the economic zone, the power battery <NUM> needs to supplement a large power, so the power reservation performance becomes worse.

Therefore, in the traveling process of the vehicle, the hybrid vehicle <NUM> mainly operates in the EV mode and series mode at a medium or low speed, and the hybrid vehicle <NUM> is mainly directly driven by the engine <NUM> at a high speed. In the series mode, the engine <NUM> operates on the economic line, to ensure the fuel economy. When the power battery <NUM> is in an extremely low SOC state, the engine <NUM> operates on the second economic line, to improve the power reservation. In the case of direct driving by the engine <NUM>, the engine <NUM> operates on the economic line at a high SOC; and as SOC decreases, the economic line on which the engine <NUM> operates shifts gradually toward the external characteristic line, to improve the power reservation. Therefore, the energy consumption, power and NVH performances of the hybrid vehicle <NUM> can well meet the needs of users.

It should be noted that the core underlying the control in the present invention is that driving by electricity dominates, and the high-efficiency operating area of the driving motor <NUM> almost covers the entire range of rotational speed and torque, as shown in <FIG>; and direct driving by the engine <NUM> is supplementary, and the engine <NUM> always operates on the optimum economic line, as shown in <FIG>, thereby improving the fuel economy of the vehicle. The faction of the driving motor <NUM> in an area where the efficiency exceeds <NUM>% is tested to <NUM>% or more, and the driving by the motor is in the high-efficiency area for a long time. The engine <NUM> operates in a high-efficiency range of <NUM>% or more for <NUM>% of the time. Because the capacity of the power battery <NUM> is not less than <NUM> kWh, the faction of traveling in the EV mode can be ensured even in a non-full power state while the engine <NUM> is maintained to operate in a high-efficiency range. When the engine <NUM> operates in the economic zone, the output power is greater than the vehicle's demand, the battery can take in excess energy, so that the vehicle can largely operates in the electrically driven mode.

In some embodiments of the present invention, as shown in <FIG> and <FIG>, the hybrid system <NUM> further includes a dual electronic controller module <NUM>. The dual electronic controller module <NUM> is respectively connected to the driving motor <NUM> and the electric generator <NUM>, and the dual electronic controller module <NUM> powers the driving motor <NUM> by an AC current outputted by the electric generator <NUM>. The power battery <NUM> is connected to the dual electronic controller module <NUM>, and the power battery <NUM> powers the driving motor <NUM> by the dual electronic controller module <NUM>, or is charged by the dual electronic controller module <NUM> with an AC current outputted by the electric generator <NUM> or the driving motor <NUM>. The maximum operating power of the electric generator <NUM> is greater than or equal to the first preset power, and the maximum operating power of the engine <NUM> is greater than or equal to the second preset power. The second preset power is greater than or equal to the first preset power, and a difference between the second preset power and the first preset power is less than <NUM>%-<NUM>% of the second preset power.

According to some embodiments of the present invention, the capacity of the power battery <NUM> is greater than or equal to the first preset capacity. For example, the first preset capacity is <NUM> kWh to <NUM> kWh. The first preset power can be set to <NUM> kW, and the second preset power can be set to <NUM> kW.

It should be noted that in the present invention, the power battery <NUM> has a large capacity, so that the hybrid vehicle <NUM> operates in the EV mode in <NUM>% of the operating time; and the large capacity of the power battery <NUM> allows for the balance of the operation of the engine <NUM> by charging and discharging, so that the engine <NUM> can always operate in high efficiency when it is in an operating state, for driving or electricity generation (referring to the foregoing description for details). Moreover, the electric generator <NUM> is large, and the corresponding electricity generation power is larger, so that rapid power supplementation can be achieved. The time for increasing SOC of the power battery <NUM> from <NUM>% to <NUM>% is about <NUM>. That is, it takes about <NUM> to generate electricity in situ. Moreover, there is little difference in the maximum operating power between the electric generator <NUM> and the engine <NUM>, so that the electric generator <NUM> can make full use of the effective power of the engine <NUM>, to avoid energy waste. In the above arrangement, the engine <NUM> is the energy source, the electric generator <NUM> is the pipeline for energy flow, and the battery is the reservoir. The source, the pipeline, and the reservoir suffer no bottleneck for energy flow. That is, the parameters of the engine <NUM>, and the electric generator <NUM>, and the battery can be coordinated to realize the efficient and reasonable utilization of energy.

In some embodiments of the present invention, as shown in <FIG>, the dual electronic controller module <NUM> includes a first inverter <NUM>, a second inverter <NUM> and a DC/DC <NUM>. An AC terminal of the first inverter <NUM> is connected to the driving motor <NUM>, a DC terminal of the first inverter <NUM> is respectively connected to a DC terminal of the second inverter <NUM> and a first DC terminal of the DC/DC <NUM>, an AC terminal of the second inverter <NUM> is connected to the electric generator <NUM>, and a second DC terminal of the DC/DC <NUM> is connected to the power battery <NUM>.

According to some embodiments of the present invention, the maximum operating power of the DC/DC <NUM> is greater than a third preset power. The third preset power is greater than the second preset power, for example, the third preset power can be set to <NUM> kW. Therefore, the capacity of the power battery <NUM> can be fully utilized, and the maximum power of the power battery <NUM> can be outputted to the driving motor <NUM>.

According to some embodiments of the present invention, the difference between the third preset power and the second preset power is less than <NUM>%-<NUM>% of the third preset power. In this way, regardless of SOC of the power battery <NUM>, the electricity generation power of the engine <NUM> causes the driving motor <NUM> to be in a high-efficiency range for most time. Because the third preset power is close to the maximum operating power of the driving motor <NUM>, the power waste caused by surplus power is effectively avoided.

The operating states of the dual electronic controller module <NUM> when the hybrid vehicle <NUM> operates in various operating modes will be described with reference to <FIG> hereinafter. In some embodiments of the present invention, as shown in <FIG>, when the power output between the engine <NUM> and the wheel end is cut off and the electric generator <NUM> is driven to generate electricity, the hybrid system <NUM> enters the series mode. AnAC current outputted by the electric generator <NUM> is converted into a DC current by the second inverter <NUM>, and the DC current is converted by the first inverter <NUM> into an AC current, which is then supplied to the driving motor <NUM>, so that the driving motor <NUM> can operate for driving work. Alternatively, an AC current outputted by the electric generator <NUM> is converted into a DC current by the second inverter <NUM>, and the DC current is converted by the first inverter <NUM> into an AC current, which is then supplied to the driving motor <NUM>; and at the same time, a DC current outputted by the power battery <NUM> is converted by the DC/DC <NUM>, and then the DC current is converted by the first inverter <NUM> into an AC current, which is then supplied to the driving motor <NUM>, so that the driving motor <NUM> can operate for driving work. Alternatively, an AC current outputted by the electric generator <NUM> is converted into a DC current by the second inverter <NUM>, and the DC current is converted by the first inverter <NUM> into an AC current, which is then supplied to the driving motor <NUM>, so that the driving motor <NUM> can operate for driving work. At the same time, the DC current is converted by the DC/DC <NUM> and then charged to the power battery <NUM>.

In some embodiments of the present invention, when the engine <NUM> and the electric generator <NUM> do not operate and the power battery <NUM> powers the driving motor <NUM>, the hybrid system <NUM> enters the EV mode. A DC current outputted by the power battery <NUM> flows through the DC/DC <NUM>, and then the DC current is converted by the first inverter <NUM> into an AC current, which is then supplied to the driving motor <NUM>, so that the driving motor <NUM> can operate for driving work.

In some embodiments of the present invention, when power coupling is enabled between the engine <NUM> and the wheel end, the electric generator <NUM> is idle, and the engine <NUM> drives the driving motor <NUM> to generate electricity, the hybrid system <NUM> enters the parallel power-generation mode. An AC current outputted by the driving motor <NUM> is converted into a DC current by the first inverter <NUM>, and then the DC current is converted by the DC/DC <NUM> and charged to the power battery <NUM>.

Therefore, in the parallel power generation mode, the driving motor <NUM> can be used to generate electricity. Because of the large power of the driving motor <NUM>, the power supplementation is faster, and the loss when the electric generator <NUM> is idle is less than the loss when the driving motor <NUM> is idle, so the energy is saved.

In some embodiments of the present invention, when power coupling is enabled between the engine <NUM> and the wheel end, the electric generator <NUM> is idle, and the power battery <NUM> powers the driving motor <NUM>, the hybrid system <NUM> enters the parallel assisting mode. A DC current outputted by the power battery <NUM> is converted by the DC/DC <NUM>, and then the DC current is converted by the first inverter <NUM> into an AC current, which is then supplied to the driving motor <NUM>, so that the driving motor <NUM> can operate for driving work. At the same time, the engine <NUM> outputs power to the wheel end so as to participate in the driving work.

The hybrid system <NUM> according to the embodiment of the present invention allows the hybrid vehicle <NUM> to be mainly driven by electricity, supplemented by driving by fuel. By comprehensively considering the current vehicle speed, the actually required torque, SOC of the power battery <NUM>, and the high-efficiency range of the engine <NUM> and the driving motor <NUM>, the vehicle is preferentially driven in a high-efficiency mode, and the mode is switched according to the power performance of the vehicle and power reservation performance of the battery, so that the energy consumption, power performance, and NVH of the hybrid vehicle <NUM> can well meet the user's demand.

<FIG> is a schematic structural view of a hybrid vehicle <NUM> according to an embodiment of the present invention. As shown in <FIG>, the hybrid vehicle <NUM> includes the hybrid system <NUM> above.

The hybrid vehicle <NUM> according to the embodiment of the present invention is enabled, by the hybrid system <NUM> as described above, to enable the hybrid vehicle <NUM> to operate with a low energy consumption in an operation mode of minimum equivalent fuel consumption according to the traveling parameter, thereby effectively improving the economy of the hybrid vehicle <NUM>, and meeting the user's expectation during use.

<FIG> is a flow chart of a control method for the hybrid vehicle <NUM> according to an embodiment of the present invention. As shown in <FIG>, the hybrid vehicle <NUM> includes an engine <NUM>, a driving motor <NUM>, an electric generator <NUM>, and a power battery <NUM>. The engine <NUM> is configured to selectively output power to a wheel end. The driving motor <NUM> is configured to output power to the wheel end. The electric generator <NUM> is connected to the engine <NUM> and driven by the engine <NUM> to generate electricity. The power battery <NUM> is configured to supply electricity to the driving motor <NUM> and be charged with an alternating current outputted by the electric generator <NUM> or the driving motor <NUM>, where the capacity of the power battery <NUM> is greater than or equal to a first preset capacity.

As shown in <FIG>, the control method for the hybrid vehicle <NUM> includes the following steps: Step S201: A traveling parameter of the hybrid vehicle <NUM> is acquired.

Step S202: The engine <NUM>, the driving motor <NUM> and the electric generator <NUM> are controlled according to the traveling parameter, and the engine <NUM> is controlled to operate in an economic zone by the charging and discharging control of the power battery <NUM>.

Step S203: Equivalent fuel consumptions when the hybrid vehicle <NUM> operates in the series mode, parallel mode and EV mode are compared, to select an operating mode of minimum equivalent fuel consumption as a current operation mode of the hybrid vehicle <NUM>.

In some embodiments of the present invention, when the engine <NUM> operates in the economic zone, if SOC of the power battery <NUM> is greater than or equal to a first preset value, the engine <NUM> is controlled to operate on an optimum economic line. Alternatively, if SOC of the power battery <NUM> is less than the first preset value and the output power of the engine <NUM> is greater than or equal to the required wheel power, the engine <NUM> is controlled to operate on the optimum economic line. The first preset value inversely correlates with the first preset capacity.

In some embodiments of the present invention, when the hybrid vehicle <NUM> is in the series mode, the engine <NUM> charges the power battery <NUM> by the electric generator <NUM>. When the hybrid vehicle <NUM> is in the parallel mode, the engine <NUM> charges the power battery <NUM> by the driving motor <NUM>.

In some embodiments of the present invention, the traveling parameter includes at least one of the required wheel torque, SOC of the power battery <NUM>, and vehicle speed of the hybrid vehicle <NUM>.

In some embodiments of the present invention, the step of controlling the engine <NUM>, the driving motor <NUM> and the electric generator <NUM> according to the traveling parameter when the hybrid vehicle <NUM> is in the parallel mode includes: determining the required wheel torque; controlling the engine <NUM> to operate on the economic line to respond to the required wheel torque when the required wheel torque is less than the output torque when the engine <NUM> operates on the economic line, and controlling the engine <NUM> to drive the driving motor <NUM> to generate electricity, so as to charge excess energy outputted by the engine <NUM> to the power battery <NUM> by the driving motor <NUM>; and controlling the engine <NUM> to operate on the economic line, when the required wheel torque is greater than the output torque when the engine <NUM> operates on the economic line, and controlling the power battery <NUM> to power the driving motor <NUM>, so both the power battery <NUM> and the engine <NUM> respond to the required wheel torque.

In some embodiments of the present invention, the step of controlling the engine <NUM>, the driving motor <NUM> and the electric generator <NUM> according to the traveling parameter when the hybrid vehicle <NUM> is in the series mode includes: determining a required wheel power according to the required wheel torque and the vehicle speed; controlling the engine <NUM> to operate on an economic line, so as to drive the electric generator <NUM> to generate electricity according to an output torque when the engine <NUM> operates on the economic line and output power to the wheel end by the driving motor <NUM>; charging excess power to the power battery <NUM> by the electric generator <NUM> when the electricity generation power of the electric generator <NUM> is greater than the required wheel power; and controlling the power battery <NUM> to power the driving motor <NUM>, so both the engine <NUM> and the power battery <NUM> respond to the required wheel power, when the electricity generation power of the electric generator <NUM> is less than the required wheel power.

In some embodiments of the present invention, the step of controlling the engine <NUM>, the driving motor <NUM> and the electric generator <NUM> according to the traveling parameter includes: determining a first wheel torque threshold entering the parallel mode and a second wheel torque threshold exiting the parallel mode of the hybrid vehicle <NUM> according to SOC of the power battery <NUM> and the speed of the hybrid vehicle <NUM> when the speed of the hybrid vehicle <NUM> is greater than or equal to a preset vehicle speed threshold, and controlling the hybrid vehicle <NUM> to enter the parallel mode when the required wheel torque is greater than or equal to the first wheel torque threshold and less than or equal to the second wheel torque threshold; control the engine <NUM> to operate on the economic line, and control the power battery <NUM> to power the driving motor <NUM>, so both the engine <NUM> and the power battery <NUM> respond to the required wheel torque, when the required wheel torque is greater than the output torque when the engine <NUM> operates on the economic line; controlling the engine <NUM> to operate on the economic line to respond to the required wheel torque, and controlling the engine <NUM> to drive the driving motor <NUM> to generate electricity, so as to charge excess energy outputted by the engine <NUM> to the power battery <NUM> by the driving motor <NUM>, if the required wheel torque is less than the output torque when the engine <NUM> operates on the economic line; and controlling the engine <NUM> to operate on the economic line, to respond to the required wheel torque independently if the required wheel torque is equal to the output torque when the engine <NUM> operates on the economic line.

In some embodiments of the present invention, the step of controlling the engine <NUM>, the driving motor <NUM> and the electric generator <NUM> according to the traveling parameter further includes: controlling the engine <NUM> to stop operation and controlling the power battery <NUM> to power the driving motor <NUM>, so as to respond to the required wheel torque by the power battery <NUM>, when the required wheel torque is less than the first wheel torque threshold.

In some embodiments of the present invention, the step of controlling the engine <NUM>, the driving motor <NUM> and the electric generator <NUM> according to the traveling parameter further includes: controlling the hybrid vehicle <NUM> to enter the series mode, when the required wheel torque is greater than the second wheel torque threshold; determining a required wheel power according to the required wheel torque and the vehicle speed; controlling the engine <NUM> to operate at a preset power at an optimum economic point, so as to drive the electric generator <NUM> to generate electricity according to the preset power when the engine <NUM> operates at the optimum economic point, and outputting power to the wheel end by the driving motor <NUM>; charging excess power to the power battery <NUM> by the electric generator <NUM> when the electricity generation power of the electric generator <NUM> is greater than the required wheel power; and controlling the engine <NUM> to increase the output power, and controlling the engine <NUM> to operate on the economic line of the engine <NUM>, so as to respond to the required wheel power, when the electricity generation power of the electric generator <NUM> is less than the required wheel power.

In some embodiments of the present invention, the step of controlling the engine <NUM>, the driving motor <NUM> and the electric generator <NUM> according to the traveling parameter further includes: determining a third wheel torque threshold entering the series mode of the hybrid vehicle <NUM> according to SOC of the power battery <NUM> and the vehicle speed, when the speed of the hybrid vehicle <NUM> is less than a preset vehicle speed threshold, and controlling the hybrid vehicle <NUM> to enter the series mode when the required wheel torque is greater than or equal to the third wheel torque threshold; determining a required wheel power according to the required wheel torque and the vehicle speed; controlling the engine <NUM> to operate at a preset power at an optimum economic point, so as to drive the electric generator <NUM> to generate electricity according to the preset power when the engine <NUM> operates at the optimum economic point, and outputting power to the wheel end by the driving motor <NUM>; charging excess power to the power battery <NUM> by the electric generator <NUM> when the electricity generation power of the electric generator <NUM> is greater than the required wheel power; and controlling the engine <NUM> to increase the output power, and controlling the engine <NUM> to operate on the economic line of the engine <NUM>, so as to respond to the required wheel power, when the electricity generation power of the electric generator <NUM> is less than the required wheel power.

In some embodiments of the present invention, the step of controlling the engine <NUM>, the driving motor <NUM> and the electric generator <NUM> according to the traveling parameter further includes: determining whether the current SOC of the power battery <NUM> is less than a second preset value when the electricity generation power of the electric generator <NUM> is less than the required wheel power, and controlling the engine <NUM> to further increase the output power if yes, so as to control the output power of the engine <NUM> to respond to the required wheel power, and charge the power battery <NUM> by the electric generator <NUM>.

In some embodiments of the present invention, the step of controlling the engine <NUM>, the driving motor <NUM> and the electric generator <NUM> according to the traveling parameter further includes: controlling the engine <NUM> to stop operation and controlling the power battery <NUM> to power the driving motor <NUM>, so as to respond to the required wheel torque by the power battery <NUM>, when the required wheel torque is less than the third wheel torque threshold.

In some embodiments of the present invention, when the hybrid vehicle <NUM> operates in the series mode, the engine <NUM> is controlled to operate on a first economic line if SOC of the power battery <NUM> is in a first preset interval; and the engine <NUM> is controlled to operate on a second economic line if SOC of the power battery <NUM> is in a second preset interval. An upper limit of the second preset interval is less than or equal to a lower limit of the first preset interval. At the same rotational speed, the output torque when the engine <NUM> operates on the second economic line is greater than or equal to the output torque when the engine <NUM> operates on the first economic line.

In some embodiments of the present invention, when the hybrid vehicle <NUM> operates in the parallel mode, the engine <NUM> is controlled to operate on a third economic line if SOC of the power battery <NUM> is in a third preset interval; the engine <NUM> is controlled to operate on a fourth economic line if SOC of the power battery <NUM> is in a fourth preset interval; and the engine <NUM> is controlled to operate on a fifth economic line if SOC of the power battery <NUM> is in a fifth preset interval. An upper limit of the fifth preset interval is less than or equal to a lower limit of the fourth preset interval, and an upper limit of the fourth preset interval is less than or equal to a lower limit of the third preset interval. The third economic line is the optimum economic line in the parallel mode. The fifth economic line basically coincide with an external characteristic line of the engine <NUM>, and the fourth economic line is located between the fifth economic line and the third economic line.

In some embodiments of the present invention, when the hybrid vehicle <NUM> operates in the EV mode, the hybrid vehicle <NUM> is controlled to operate in the series mode or the parallel mode and the engine <NUM> is controlled to operate in the economic zone according to SOC of the power battery <NUM>, the vehicle speed and the required wheel torque if SOC of the power battery <NUM> is less than the third preset value.

It should be noted that the description of the control method for the hybrid vehicle <NUM> according to the present invention can be made reference to the description of the hybrid system <NUM> according to the present invention, and details will not be given here again.

In the control method for the hybrid vehicle <NUM> according to the embodiment of the present invention, a traveling parameter of the hybrid vehicle <NUM> is acquired; the engine <NUM>, the driving motor <NUM>, and the electric generator <NUM> are controlled according to the traveling parameter, to enable the engine <NUM> to operate in an economic zone, by charging and discharging control of the power battery <NUM>; and the equivalent fuel consumptions when the hybrid vehicle <NUM> is in the series mode, parallel mode, and EV mode are compared, to select an operation mode of minimum equivalent fuel consumption as a current operation mode of the hybrid vehicle <NUM>. In this way, the hybrid vehicle <NUM> is allowed to operate with a low energy consumption in an operation mode of minimum equivalent fuel consumption according to the traveling parameter, thereby effectively improving the economy of the hybrid vehicle <NUM>, and meeting the user's expectation during use.

In some embodiments, a computer-readable storage medium is further provided, on which a control program for the hybrid vehicle <NUM> is stored. When the control program for the hybrid vehicle <NUM> is executed by the processor <NUM>, the control method for the hybrid vehicle <NUM> is implemented.

The computer-readable storage medium according to the embodiment of the present invention enables, by the control method for the hybrid vehicle <NUM> as described above, the hybrid vehicle <NUM> to operate with a low energy consumption in an operation mode of minimum equivalent fuel consumption according to the traveling parameter, thereby effectively improving the economy of the hybrid vehicle <NUM>, and meeting the user's expectation during use.

<FIG> is a schematic structural view of a vehicle controller <NUM> according to an embodiment of the present invention. As shown in <FIG>, the vehicle controller <NUM> includes a memory <NUM>, a processor <NUM>, and a control program for the hybrid vehicle <NUM> stored on the memory <NUM> and running on the processor <NUM>. When the control program for the hybrid vehicle <NUM> is implemented by the processor <NUM>, the control method for the hybrid vehicle <NUM> is implemented.

The vehicle controller <NUM> according to the embodiment of the present invention enables, by the control method for the hybrid vehicle <NUM> as described above, the hybrid vehicle <NUM> to operate with a low energy consumption in an operation mode of minimum equivalent fuel consumption according to the traveling parameter, thereby effectively improving the economy of the hybrid vehicle <NUM>, and meeting the user's expectation during use.

It should be noted that the logic and/or steps shown in the flowcharts or described otherwise herein, for example, a sequenced list that may be considered as executable instructions used for implementing logical functions, may be specifically implemented in any computer-readable medium for use by an instruction execution system, apparatus, or device (for example, a computer-based system, a system including the processor <NUM>, or other systems that can obtain an instruction from the instruction execution system, apparatus, or device and execute the instruction) or for use with such instruction execution systems, apparatuses, or devices. In the context of this specification, a "computer-readable medium" may be any apparatus that can include, store, communicate, propagate, or transmit the program for use by the instruction execution system, apparatus, or device or in combination with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic apparatus), a random access memory (RAM) <NUM>, a read-only memory (ROM) <NUM>, an erasable programmable read-only memory <NUM> (EPROM or flash memory <NUM>), an optical fiber apparatus, and a portable compact disk read-only memory (CD-ROM) <NUM>. In addition, the computer-readable medium can even be paper or other suitable media on which the program can be printed, because the program can be obtained electronically by, for example, optically scanning the paper or other media, then editing, interpreting, or processing in other suitable ways if necessary, and then stored in a computer memory <NUM>.

It should be understood that various parts of the present invention can be implemented by hardware, software, firmware, or a combination thereof. In the foregoing implementations, steps or methods can be implemented by software or firmware that is stored in a memory <NUM> and executed by a proper instruction execution system. For example, if hardware is used for implementation, same as in another implementation, implementation may be performed by any one of the following technologies well known in the art or a combination thereof: a discrete logic circuit including a logic gate circuit for implementing a logic function of a data signal, a dedicated integrated circuit including a proper combined logic gate circuit, a programmable gate array (PGA), a field programmable gate array (FPGA), and the like.

In the description of the specification, the description with reference to the terms "an embodiment", "some embodiments", "example", "specific example", or "some example" and so on means that specific features, structures, materials or characteristics described in connection with the embodiment or example are embraced in at least one embodiment or example of the present invention. In this specification, exemplary descriptions of the foregoing terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any suitable manner in one or more embodiments.

In addition, the terms "first" and "second" are used merely for the purpose of description, and shall not be construed as indicating or implying relative importance or implying a quantity of indicated technical features. Therefore, the features defined by "first", and "second" may explicitly or implicitly include at least one of the features. In the descriptions of the present invention, unless explicitly specified, "multiple" means at least two, for example, two or three.

In the present invention, it should be noted that unless otherwise explicitly specified and limited, the terms "mount", "connect", "connection", and "fix" should be understood in a broad sense. For example, a connection may be a fixed connection, a detachable connection, or an integral connection; or the connection may be a mechanical connection or an electrical connection; or the connection may be a direct connection, an indirect connection through an intermediary, or internal communication between two elements or mutual action relationship between two elements, unless otherwise specified explicitly. For those of ordinary skill in the art, the specific meanings of the above terms in the present disclosure can be understood according to specific situations.

Claim 1:
A control method for a hybrid vehicle (<NUM>), the hybrid vehicle comprising an engine (<NUM>), a driving motor (<NUM>), an electric generator (<NUM>), and a power battery (<NUM>), the engine being configured to selectively output power to a wheel end, the driving motor being configured to output power to the wheel end, the electric generator being connected to the engine and driven by the engine to generate electricity, the power battery being configured to supply electricity to the driving motor and be charged with an alternating current outputted by the electric generator or the driving motor, and the capacity of the power battery being greater than or equal to a first preset capacity, the control method comprising:
acquiring (S201) a traveling parameter of the hybrid vehicle;
controlling (S202) the engine, the driving motor and the electric generator according to the traveling parameter, to enable the engine to operate in an economic zone by charging and discharging control of the power battery; characterized by
comparing (S203) the equivalent fuel consumptions when the hybrid vehicle is in a series mode, a parallel mode, and an EV mode, to select an operation mode of minimum equivalent fuel consumption as a current operation mode of the hybrid vehicle;
wherein when the engine (<NUM>) operates in the economic zone, the engine is controlled to operate on an optimum economic line if SOC of the power battery is greater than or equal to a first preset value, or the engine is controlled to operate on the optimum economic line if SOC of the power battery is less than the first preset value and the output power of the engine is greater than or equal to a required wheel power, wherein the first preset value inversely correlates with the first preset capacity.