Patent Description:
Electric vehicles, with such advantages as good environmental protection performance, low noise, low use-cost, have great market prospect and are capable of promoting energy conservation and emission reduction and facilitating the development and progress of society.

In the prior art, control components of a high-voltage electrical system of the electric vehicle mainly consist of a vehicle control unit (Vehicle Control Unit, VCU) and a battery management system (Battery Management System, BMS). The VCU, through a power distribution unit (Power Distribution Unit, PDU), performs high-voltage control of such electric components as a water cooling unit, an electric defroster, an electric air conditioner, an electric warm-air blower, an oil pump controller (oil pump DC/AC), an air pump controller (air pump DC/AC), and a DC/DC converter; and the BMS mainly performs high-voltage control of a motor driver module (inverter) of a motor control unit (Motor Control Unit, MCU).

As mentioned above, in the prior art, as control components of the high-voltage electrical system of the electric vehicle are scattered, the information interaction between the VCU and the BMS is performed through a CAN, and complex communication protocol and control strategy need to be made. And only after mutual logical judgment, may closing and disconnecting the relay be performed. Complex wiring, a plurality of wires, and long communication cycle increase the power-on and power-off time of the vehicle, and it is prone to faults, as a result of which the vehicle fails to be powered on and start normally, and the user experience is affected. <CIT> relates to a device for battery charging and discharging. <CIT> describes a battery heating unit. <CIT> Al relates to an electronic circuit for charging and heating a battery.

The present invention provides an electric vehicle control system and a control method, an electric vehicle power-on method, an electric vehicle power-off method, an electric vehicle charging method as defined in the appended claim set.

According to a first aspect, there is provided an electric vehicle control system in this application, including:.

In the above embodiment of this application, the electric vehicle control system is provided with a domain control unit (Domain Control Unit, DCU). Sampling signals of the power battery, the motor driver module and the electrical device are directly sent to the DCU, and the DCU manages and controls the power battery, the motor driver module and the electrical device according to the sampling signals. That is, the DCU integrates the functions of the BMS, the MCU, and the VCU, not like the prior art, in which the VCU, the BMS and the MCU, with independent management and control, perform complex communication and control strategy mutually. Therefore, the control system of the electric vehicle in this embodiment, with a simple structure, is capable of simplifying the wiring, the control strategy and the communication manner.

In some embodiments, the electric vehicle control system also includes:.

In the above embodiment of this application, sampling signals of the switch module are directly sent to the DCU, and the DCU controls the switch module according to the sampling signals so as to control the operation of the electrical device and the motor driver module. That is, the DCU further integrates the functions of the PDU. Therefore, the control system structure of the electric vehicle in this embodiment is further simplified, and the wiring, the control strategy and the communication manner are also further simplified.

In some embodiments, the domain control unit detects a state of the electrical device and calculates test data to determine a control strategy of the electrical device.

In the above embodiment of this application, the DCU receives sampling signals from the electrical device, detects its state, calculates the detected state data, and determines control strategy of the electrical device on the basis of the calculated detection data. That is, the DCU performs internal calculations and logical judgment, and the calculation results may be shared. Thus, the procedures that each controller processes and then transmits data individually in the prior art are eliminated, and the comprehensive processing capacity is greatly improved, and it is not needed to formulate complex communication protocol and control strategy.

In some embodiments, the domain control unit is connected to the electrical device and the current sampling unit with signal wires, and the domain control unit is connected to the switch module with hard wires.

In the above embodiment of this application, the DCU is connected to the electrical device and the current sampling unit through the CAN, and the communication between the DCU and the electrical device and the current sampling unit is performed through the CAN Protocol (Controller Area Network Protocol, controller area network bus protocol). The DCU receives the sampling types of the electrical device and the current sampling unit, and sends control signals to them. As the DCU and the switch module are connected with hard wires, signals may be transmitted fast between the DCU and the switch module and then the switch module may be controlled quickly.

In some embodiments, the electrical device comprises an air pump controller, an oil pump controller, an air conditioner compressor, a water cooling unit, a voltage conversion module (DC/DC), and the motor driver module.

In the above embodiment of this application, the DCU controls a plurality of electrical device such as the air pump controller, the oil pump controller, the air conditioner compressor, the water cooling unit, the voltage conversion module (DC/DC), and the motor driver module to achieve high side power distribution control of the vehicle.

According to a second aspect, there is provided an electric vehicle control method in this application. The electric vehicle is provided with the domain control unit, and the control method includes:
the domain control unit receiving sampling signals from a power battery and an electrical device, and managing and controlling operations of the power battery and the electrical device according to the sampling signals.

In the above embodiment of this application, the domain control unit directly receives sampling signals of the power battery and the electrical device, and manages and controls the operation of the power battery and electrical device directly according to the sampling signals. That is, the DCU integrates the functions of the BMS, the MCU, and the VCU, and the electric vehicle control method in this embodiment is capable of simplifying the control strategy and the communication manner, not like the prior art, in which the VCU, the BMS and the MCU, with independent management and control, perform complex communication and control strategy mutually.

In some embodiments, the domain control unit receives the sampling signals from a switch module and performs on/off control of the switch module according to the sampling signals.

In the above embodiment of this application, sampling signals of the switch module are directly sent to the DCU, and the DCU controls the switch module according to the sampling signals so as to control the operation of the electrical device and the motor driver module. That is, the DCU further integrates the functions of the PDU. Therefore, the electric vehicle control method in this embodiment further simplifies the control strategy and the communication manner.

In the above embodiment of this application, the DCU receives sampling signals from the electrical device, detects its state, calculates the detected state data, and determines control strategy of the electrical device on the basis of the calculated detection data. That is, the DCU performs internal calculations and logical judgment, and the calculation results may be shared. As a result, the procedures that each controller processes and then transmits data individually in the prior art are eliminated. The comprehensive processing capacity is greatly improved, and it is not needed to formulate complex communication protocol and control strategy.

In the above embodiment of this application, the DCU is connected to the electrical device and the current sampling unit with signal wires, such as CAN connection, that is, the communication between the DCU and the electrical device and the current sampling unit is performed through the CAN Protocol (Controller Area Network Protocol, controller area network bus protocol). The DCU receives the sampling signals of the electrical device and the current sampling unit, and sends control signals to them. As the DCU and the switch module are connected with hard wires, signals may be transmitted fast between the DCU and the switch module and then the switch module may be controlled quickly.

In some embodiments, the electrical device include the air pump controller, the oil pump controller, the air conditioner compressor, the water cooling unit, the voltage conversion module, and the motor driver module.

According to a third aspect, there is provided an electric vehicle power-on method in this application. The electric vehicle is provided with a domain control unit for receiving sampling signals from a power battery, a switch module, and an electrical device, and manages and controls operations of the power battery, the switch module, and the electrical device according to the sampling signals, and the power-on method includes the following steps:.

In the power-on method described in the above embodiment of this application, the domain control unit directly controls the relay and thus the control capability is centralized and the response is fast, and the situation in the prior art that the VCU, the BMS and the PDU work independently and perform complex communication and control strategy mutually is simplified. In this embodiment, the DCU detects and calculates the power-on conditions and makes logical judgment, and the calculation results are shared, thus the link in the prior art that each controller transmits data to each other and the VCU makes judgment is eliminated. Therefore, the communication manner and the control strategy of the power-on method in this embodiment are simple and capable of shortening the power-on time.

In some embodiments, the steps of the domain control unit to detect power-on conditions include:.

In the technical solutions described in the above embodiment of this application, the domain control unit quickly detects the above power-on conditions, thus the power-on time is shortened and also the power-on safety is ensured.

In some embodiments, after diagnosing each of the relays, the domain control unit reads information about the electrical device stored inside the domain control unit; and
the domain control unit performs calculations according to the read information about the electrical device and then performs high-voltage distribution for the electrical device according to calculation results.

In the technical solutions described in the above embodiment of this application, the DCU reads the information stored in its internal electrical device and performs internal calculations, and the high-voltage distribution strategy of the electrical device is determined and energy management and power distribution are optimized according to the calculation results. The internal information and calculation results of the DCU may be shared, thus the procedures that each controller processes and then transmits data individually in the prior art are eliminated, and complex communication protocol and control strategy are not needed, and also the power-on time is greatly shortened and faults are reduced.

In some embodiments, the information about the electrical device read by the domain control unit comprises information of the electrical device to be turned on and rated power and weight of each electrical device.

In the technical solutions described in the above embodiment of this application, the DCU reads what electrical device needs to be turned on and the rated power and weight of each electrical device, and, by reference to the State of Charge (SOC) of the battery, performs calculations according to the rated power of the electrical device, and then determines whether power processing is required for the equipment with certain powers according to the calculation results in order to optimize high-voltage distribution and energy management.

According to a fourth aspect, there is provided an electric vehicle power-off method in this application. The electric vehicle is provided with a domain control unit for receiving sampling signals from a power battery, a switch module, and an electrical device, and manages and controls operations of the power battery, the switch module, and the electrical device according to the sampling signals, and the power-off method includes the following steps:.

In the power-off method described in the above embodiment of this application, the domain control unit (DCU) gives a power-off instruction, followed by the power-off process, namely an active power-off mode. In the power-off method, the domain control unit directly controls the relay and thus the control capability is centralized and the response is fast, and the situation in the prior art that the VCU, the BMS and the PDU work independently and perform complex communication and control strategy between each other is simplified. Therefore, the power-off method in the embodiment, with simple communication manner and control strategy, is capable of shortening the power-off time.

According to a fifth aspect, there is provided an electric vehicle power-off method in this application. The electric vehicle is provided with a domain control unit for receiving sampling signals from a power battery, a switch module, and an electrical device, and manages and controls operations of the power battery, the switch module, and the electrical device according to the sampling signals, and the power-off method includes the following steps:.

In the power-off method described in the above embodiment of this application, the domain control unit (DCU) receives a power-off request instruction, followed by the power-off process, namely a passive power-off mode. In the power-off method, the DCU acquires the current acquisition signals of the power battery and the motor driver module and determines the state of the power battery and the motor driver module, and the domain control unit directly controls the relay and thus the control capability is centralized and the response is fast, and the link in the prior art that the VCU, the BMS and the PDU work independently and perform complex communication and control strategy between each other is simplified. Therefore, the power-off method in the embodiment, with simple communication manner and control strategy, is capable of shortening the power-off time.

According to a sixth aspect, there is provided an electric vehicle charging method in this application. The domain control unit receives sampling signals from the power battery, the switch module, and the electrical device, and manages and controls the operation of the power battery, switch module, and electrical device according to the sampling signals, and the charging method includes the following steps:.

In some embodiments, when the domain control unit detects that the charging state reaches the ending condition, an instruction to end the charging will be sent, and the domain control unit sends disconnecting instructions to disconnect the relay K1 connected to the positive pole of the charging source, the relay K2 connected to the negative pole of the charging source, the water cooling unit relay K5, and the major loop relay K0 connected to the negative pole of the power battery so as to end the charging.

In the charging method described in the above embodiment of this application, the domain control unit directly controls the relay and thus the control capability is centralized and the response is fast, and the situation in the prior art that the VCU, the BMS and the PDU work independently and perform complex communication and control strategy between each other is simplified. Therefore, the charging method in the embodiment, with simple communication manner and control strategy, is capable of reducing faults.

According to a seventh aspect, there is provided a computer-readable storage medium stored with computer-executable instructions, which, when being executed by a processor, perform the method according to any one of the second to sixth aspects of the present application.

According to an eighth aspect, there is provided an electrical device, including: a memory stored with computer instructions; and
a processor executing the computer instructions to perform the method according to any one of the second to sixth aspects of the present application.

The following gives a description of the technical solutions in the embodiments of this application with reference to drawings. The following drawings are merely intended for showing preferred implementations but not limit this application. In addition, of all the drawings, the same drawing reference numeral indicates the same component.

The following gives a detailed description of the embodiments of the technical solutions of this application with reference to drawings. The following embodiments are merely intended for specifying the technical solutions of this application and may not be used to limit the scope of protection of this application.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those normally understood by those skilled in this art; the terms used herein are merely for the purpose of describing specific embodiments but not limiting this application; and the terms "include" and "have" and any variations of them in the description and claims and the drawings of this application are intended to cover non-exclusive inclusions.

In the description of the embodiments of this application, technical terms such as "first" and "second" are merely intended for distinguishing different objects and may not be understood as indicating or implying relative importance, or implicitly indicating the quantity, specific order or primary and secondary relation of the indicated technical features.

All embodiments described in the description are not mutually exclusive, and those skilled in this art may have all these embodiments combined according to the technical ideas and general technical knowledge of this application.

In the description of the embodiments of this application, the term "and/or" only describes the association relation of the associated objects and means that there may be three relations. For example, A and/or B may be expressed as the three cases: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the relation between the associated objects is "or".

In the description of the embodiments of this application, the term "a plurality of" means more than two (including two), "more groups" means more than two groups (including two groups), and "more pieces" means more than two pieces (including two pieces).

In the description of the embodiments of this application, unless otherwise expressly provided and defined, the terms "mount", "concatenate", "connect", "fix", and the like shall be understood in a broad sense. For example, a "connection" may be a fixed connection, a detachable connection, or an integrated connection, may be a mechanical connection or an electric connection, may be a direct connection or an indirect connection implemented through an intermediary, and may be an internal communication between two elements or an interaction of two elements. A person of ordinary skill in the art can understand the specific meanings of the terms in the embodiments of this application according to specific situations.

The electric vehicle is powered by the power battery. The electric vehicle includes an electric drive and control system, a driving force transmission device, a traveling device, a steering device, a braking device, and other mechanical systems. The electric drive and control system, as the core of the electric vehicle, distinguishes electric vehicles from traditional oil-fueled vehicles. And the electric drive and control system includes the power battery, a motor, a motor speed control device, and the like. The electric vehicle is a complex system including a plurality of subsystems. In the prior art, each subsystem performs its functions through its own electronic control unit (Electronic Control Unit, ECU).

The electrical system of the electric vehicle includes a high-voltage electrical system and a low voltage electrical system. The high-voltage electrical system mainly controls the startup, travel, charging and discharging, air conditioning, and the like of the electric vehicle, and a power battery system, a motor drive system, a high-voltage power distribution system, a charging system, high-voltage electrical device, and the like.

The electric vehicle is equipped with a vehicle control unit (Vehicle Control Unit, VCU) to control each component and coordinate each subsystem of the electric vehicle. The VCU acquires signals from an accelerator pedal, a brake pedal and other components and then determine how to control the movement of each component controller to drive the electric vehicle to run normally. The VCU achieves optimal energy utilization and extends the service life by coordinating and managing the Motor Control Unit (MCU), the Battery Management System (BMS), the transmission system and other vehicle-mounted energy-consuming electrical device of the electric vehicle.

The Motor Control Unit (MCU) (also known as motor control module) of the electric vehicle controls the motor driver module, and the motor driver module drives the motor. The MCU converts the high-voltage direct current of the power battery into the high-voltage alternating current required to drive the electric vehicle so as to drive the motor to output mechanical energy. The MCU receives the vehicle travel control instructions of the VCU and controls the motor to output specified torque and rotating speed to drive the vehicle to run.

The battery management system (Battery Management System, BMS) of the electric vehicle power battery, a control system protecting the power battery for safe use, performs charging and discharging management, high-voltage control, battery protection, battery data acquisition, battery status assessment, energy balance between battery cells, and calculation of the state of charge (State of Charge, SOC, namely battery remaining capacity) of power batteries with the SOC maintained within a reasonable range, and dynamically monitors the working state of the power batteries, and the like.

The energy-consuming electrical device of the electric vehicle mainly includes the water cooling unit, the electric defroster, the electric air conditioner, the electric warm-air blower, the oil pump controller, the air pump controller and the DC/DC converter, and the like. The water cooling unit, through water convection heat transfer, takes away the heat generated by the battery and lowers the temperature of the battery. The electric defroster arranges a plurality of heating resistance wires evenly in a windshield, and after a resistance switch is turned on, the resistance wires heats the glass rapidly, then the temperature of the glass rises rapidly and the frost mist attached to the glass melts with heat, and the defrosting is achieved. The electric warm-air blower mainly consists of an air heater and a fan. The air heater radiates heat and the fan sends the heat out to regulate the air temperature in the car.

The oil pump controller (oil pump DC/AC), connected to the oil pump, is used to control the motor of a power steering pump of the electric vehicle. The oil pump DC/AC inverts the direct current over 300V in a battery pack of the electric vehicle into alternating current to supply power to the oil pump. By controlling the power supply current, the rotating speed and power of the oil pump are controlled.

The air pump controller (air pump DC/AC), connected to the air pump, is used to control the motor of a brake air pump of the electric vehicle. The air pump controller converts the direct current of the electric vehicle into the alternating current to supply power to the air pump, and controls the rotating speed and power of the air pump by controlling the power supply current.

The DC/DC is a voltage conversion module, which converts the high-voltage direct current of the power battery to the 12V direct current to supply power to the low-voltage system.

The PDU (Power Distribution Unit, distribution unit, distribution panel) electrically connects high-voltage elements and devices with busbars and wire harnesses to provide such functions as charging and discharging control, high-voltage component power-on control, circuit overload and short-circuit protection, high-voltage sampling, and low-voltage control for the high-voltage system of the electric vehicle to protect and monitor the operation of the high-voltage system.

In the prior art, high side control components for high-voltage power distribution in the electric vehicle mainly include the VCU (Vehicle Control Unit, vehicle controller) and the BMS (Battery Management System, power battery management system). The VCU, through the power distribution unit (Power Distribution Unit, PDU), mainly performs high-voltage control of such electrical device as the water cooling unit, the electric defroster, the electric air conditioner, the electric warm-air blower, the oil pump DC/AC, and the air pump DC/AC and DC/DC; and the BMS mainly performs high-voltage control of the motor driver module (inverter) of the motor control unit (Motor Control Unit, MCU).

The control of high side control components in the prior art is relatively scattered, resulting in complex structure and wiring of the high side control components in the prior art. Furthermore, the VCU and BMS need to perform information interaction through the CAN (Controller Area Network), and complex communication protocol and control strategy need to be made. And only after mutual logical judgment, may closing and disconnecting the relay be performed, and thus the power-on and power-ff time of the vehicle is increased due to the long power-on and power-off cycle, and it is prone to faults, as a result of which the vehicle fails to be powered on and start normally, and the user experience is affected.

In addition, in the prior art, each function of the electric vehicle generally needs to be equipped with a controller. With the continuous increase of functions of the electric vehicle, the number of controllers increases dramatically, which makes the electronic system of the electric vehicle become very complicated. This leads to an increase in the cost of the vehicle and a waste of hardware resources, which is not beneficial to the development of electric vehicles. To solve the problem of distributed electronic and electrical architecture in the prior art, a concept of the domain control unit (Domain Control Unit, DCU) is proposed recently. For example, the electronic components of the electric vehicle are divided into a plurality of domains such as a dynamic domain, an intelligent cockpit domain, and an autonomous driving domain, with each domain controlled by a controller chip with more processing power in a relatively centralized manner.

In the embodiments of this application, there is provided an electric vehicle control system and a control method, an electric vehicle power-on method, an electric vehicle power-off method, and an electric vehicle charging method, which is capable of simplifying the control system structure and the control strategy and shortening the power-on and power-off time.

<FIG> is a structural schematic diagram of the electric vehicle control system according to some embodiments of this application.

In the embodiments of this application, an electric vehicle control system <NUM> includes: a DCU <NUM> (domain control unit, Domain Control Unit), a battery current sampling unit <NUM>, and a motor driver module current sampling unit <NUM>, and the electrical device <NUM> and <NUM> and DCU <NUM> control the electric vehicle, and the battery current sampling unit <NUM> and the motor driver module current sampling unit <NUM> conduct current sampling on the power battery <NUM> and the motor driver module <NUM> of the electric vehicle respectively, and then send the sampling signals to the DCU <NUM>. The electrical device <NUM> and <NUM>, driven by the power battery <NUM>, sample the current flowing through the electrical device <NUM> and107 and send the sampling signals to the DCU <NUM>. And the DCU <NUM>, according to the sampling signals sent by the electrical device <NUM> and <NUM> and the current sampling units <NUM> and <NUM>, manages and controls the power battery <NUM>, the motor driver module <NUM>, and the electrical device <NUM> and <NUM>.

It needs to be noted that the motor driver module <NUM> also belongs to the electrical device. For convenience, the motor driver module <NUM> is described differently from other electrical device <NUM> and <NUM>.

As an embodiment of this application, the electric vehicle control system <NUM> also includes, the main switch <NUM> connected to the power battery <NUM> with power lines, the <NUM>st switch <NUM> connected to the first electrical device <NUM>, the <NUM>nd switch <NUM> connected to the second electrical device <NUM>, the Nth switch <NUM> connected to the motor driver module <NUM>, and a switch voltage sampling unit <NUM>. The <NUM>st switch <NUM>, the <NUM>nd switch <NUM> and the Nth switch <NUM> switch on or switch off the power supply circuit of the electrical device <NUM> and <NUM> and the motor driver module <NUM>; the switch voltage sampling unit <NUM> samples the voltage of the <NUM>st switch <NUM>, the <NUM>nd switch <NUM> and the Nth switch <NUM> and sends the sampling signals to the DCU <NUM>; and the DCU <NUM> performs on/off control of the <NUM>st switch <NUM>, the <NUM>nd switch <NUM> and the Nth switch <NUM> according to the sampling signals sent by the switch voltage sampling unit <NUM>.

As shown in <FIG>, the power battery <NUM> is connected to the main switch <NUM> with power lines, and the main switch <NUM> is connected to the <NUM>st switch <NUM>, the <NUM>nd switch <NUM> and the Nth switch <NUM> with power lines respectively.

The battery current sampling unit <NUM>, the battery voltage sampling unit <NUM> and the battery temperature sampling unit <NUM> are connected to the DCU <NUM> with signal wires to acquire the current, voltage and temperature information of the power battery <NUM> and send the acquisition signals to the DCU <NUM>. The DCU <NUM> receives the current, voltage and temperature sampling signals of the power battery <NUM>, and performs calculations and judgment. According to the judgment results, the DCU <NUM> controls the current distribution of the switches <NUM>, <NUM>, <NUM>, and <NUM>, the electrical device <NUM> and <NUM>, and the motor driver module <NUM>, and the like.

The switch voltage sampling unit <NUM> is connected to the DCU <NUM> with signal wires to acquire the voltage signals of the <NUM>st switch <NUM>, the <NUM>nd switch <NUM> and the Nth switch <NUM> and send the acquisition signals to the DCU <NUM>. The DCU <NUM> receives the sampling signals of the <NUM>st switch <NUM>, the <NUM>nd switch <NUM> and the Nth switch <NUM>, performs calculations and judgment, and controls the <NUM>st switch <NUM>, the <NUM>nd switch <NUM> and the Nth switch <NUM> according to the judgment results.

The motor driver module current sampling unit <NUM>, a motor driver module voltage sampling unit <NUM>, and a motor driver module temperature sampling unit <NUM> are connected to the DCU <NUM> and the motor driver module <NUM> with signal wires; and the motor driver module current sampling unit <NUM>, the motor driver module voltage sampling unit <NUM>, and the motor driver module temperature sampling unit <NUM> acquire the current, voltage and temperature information of the motor driver module <NUM> and send the acquisition signals to the DCU <NUM>. The DCU <NUM> receives the current, voltage and temperature sampling signals of the motor driver module <NUM>, performs calculations and judgment, and controls such drive signals as the torque and rotating speed output to the motor by the motor driver module <NUM> according to the judgment results.

In the above embodiment of this application, the electric vehicle control system <NUM> includes the domain control unit DCU <NUM>; the sampling signals of the power battery <NUM>, the motor driver module <NUM>, and the electrical device <NUM> and <NUM> are directly sent to the DCU <NUM>, and the DCU <NUM> manages the power battery <NUM> and controls the motor driver module <NUM> and the electrical device <NUM> and <NUM> according to the sampling signals. That is, the DCU <NUM> integrates the functions of the VCU, the BMS and the MCU in the prior art.

In a further embodiment of this application, the sampling signals of the switches <NUM>, <NUM> and <NUM> are directly sent to the DCU <NUM>, and the DCU <NUM> controls the switches <NUM>, <NUM> and <NUM> according to the sampling signals so as to control the electrical device <NUM> and <NUM> and the motor driver module <NUM>. That is, the DCU <NUM> further integrates the functions of the PDU605 in the prior art.

As the DCU <NUM> in this embodiment integrates the functions of the VCU, the BMS, the PDU and the MCU, the VCU, the BMS, the PDU and the MCU need not to conduct independent management and control or perform complex communication and control strategy mutually like in the prior art. Therefore, the electric vehicle control system <NUM> in this embodiment, with a simple structure, is capable of simplifying the wiring, the control strategy and the communication manner.

<FIG> is a schematic diagram of high-voltage power distribution of the electric vehicle control system according to some embodiments of this application.

As shown in <FIG>, in the electric vehicle control system <NUM>, the DCU <NUM> is arranged in a high voltage distribution box <NUM>.

In <FIG>, the high-voltage electrical device such as a DC/DC <NUM>, a reserved charging port <NUM> for connecting a charger, the motor driver module <NUM>, a water cooling unit <NUM>, an electric defroster <NUM>, an electric air conditioner <NUM>, an electric warm-air blower <NUM>, an oil pump DC/AC <NUM>, and an air pump DC/AC <NUM> are connected with the power battery <NUM> with power lines. On the lines between the power battery <NUM> and each electrical device, there are relays connected, and the relays are used as the switches to switch on or off the power supply circuit of each electrical device, and there is also a circuit protection element FUSE. Each switch is connected with the DCU <NUM> with hard wires, and the DCU <NUM> controls the disconnection and closing of each switch and the current supplied by the power battery <NUM> to each electrical device so as to perform high voltage distribution and drive each electrical device.

It needs to be noted that the diagram of the sampling unit is omitted in <FIG> for convenience of description.

Specifically, in <FIG>, the positive pole of the power battery <NUM> is connected to a manual maintenance switch MSD <NUM>, and its negative pole is connected to a general negative relay K0, and the positive and negative poles of the charging port <NUM> are respectively connected to a positive charging relay K1 and a negative charging relay K2. The positive ole of the motor driver module <NUM> is connected to a positive-side main relay K3 and the precharging relay K4, and the precharging relay K4 precharges the capacitor in the motor driver module <NUM>. The positive pole of the water cooling unit <NUM> is connected to the water cooling unit relay K5; the positive pole of the electric defroster <NUM> is connected to the electric defroster relay K6; the positive pole of the electric air conditioner <NUM> and the positive pole of the electric warm-air blower <NUM> are connected to the relay K7; and the positive pole of the oil pump DC/AC <NUM> and the positive pole of the air pump DC/AC <NUM> are connected to the relay K8.

The relays K1, K2, K3, K4, K5, K6, K7, and K8 are connected to the DCU <NUM> with hard wires. And the DCU <NUM>, through the current, the voltage and the temperature sampling signals, to detect the status of the relays K1, K2, K3, K4, K5, K6, K7, and K8, as well as the status of the charging port <NUM>, the motor driver module <NUM>, the water cooling unit <NUM>, the electric defroster <NUM>, the electric air conditioner <NUM>, the electric warm-air blower <NUM>, the oil pump DC/AC <NUM>, and the air pump DC/AC <NUM>, and then internal calculations and logical judgment are performed in the DCU <NUM> to control the relays K1, K2, K3, K4, K5, K6, K7, and K8 to connect or disconnect the power supply circuits of the charging port <NUM>, the motor driver module <NUM>, the water cooling unit <NUM>, the electric defroster <NUM>, the electric air conditioner <NUM>, the electric warm-air blower <NUM>, the oil pump DC/AC <NUM>, and the air pump DC/AC <NUM>, and to regulate the current supplied to the above electrical device.

In this embodiment, the DCU <NUM> integrates the functions of the four controllers including the VCU, the BMS, the MCU and the PDU in the prior art. The DCU <NUM> acquires information of a plurality of electrical device, the power battery <NUM> and a plurality of switches, detects the status of a plurality of electrical device, the power battery <NUM> and switches, and then performs internal calculations and logical judgment to determine the control strategy, so not like the prior art, in which the VCU, the BMS, the PDU and the MCU work independently and perform complex communication between each other. Therefore, the electric vehicle control system <NUM> with simple structure in this embodiment is capable of reducing the risk of faults in a fast and efficient manner.

<FIG> is a schematic diagram of current distribution of major electrical device in the electric vehicle control system according to some embodiments of this application, showing the high-voltage current distribution of major electrical device in <FIG>.

As shown in <FIG>, the motor driver module <NUM> is electrically connected to the power battery <NUM> through the positive-side main relay K3, the precharging relay K4, and the general negative relay K0. The water cooling unit <NUM> is electrically connected to the power battery <NUM> through the water cooling unit relay K5 and the general negative relay K0. The electric defroster <NUM> is electrically connected to the power battery <NUM> through the electric defroster relay K6 and the general negative relay K0. The electric air conditioner <NUM> and the electric warm-air blower <NUM> are electrically connected to the power battery <NUM> through the relay K7 and the general negative relay K0. The oil pump DC/AC <NUM> and the air pump DC/AC <NUM> are electrically connected to the power battery <NUM> through the relay K8 and the general negative relay K0. An external charger <NUM>, inserted into the charging port <NUM>, is electrically connected to the power battery <NUM> through the charging positive relay K1 and the charging negative relay K2.

In this embodiment, the DCU <NUM> integrates the functions of the four controllers including the VCU, the BMS, the MCU and the PDU in the prior art. The DCU <NUM> acquires information of a plurality of electrical device, the power battery <NUM> and a plurality of switches, detects the status of a plurality of electrical device, the power battery <NUM> and switches, and then performs internal calculations and logical judgment to determine the control strategy. Therefore, the electric vehicle control system <NUM> with simple structure in this embodiment is capable of reducing the risk of faults in a fast and efficient manner and ensuring efficient and effective control of a plurality of electrical device.

<FIG> is a connection diagram of the electric vehicle control system according to some embodiments of this application.

As shown in <FIG>, in the electric vehicle control system <NUM> in the embodiment of this application, the DCU <NUM> is connected to the battery current sampling unit <NUM>, the switch voltage sampling unit <NUM>, the DC/DC <NUM>, the motor driver module <NUM>, the water cooling unit <NUM>, the air conditioner <NUM>, the oil pump DC/AC <NUM> and the air pump DC/AC <NUM> through signal wires, such as the communication performed through the CAN Protocol (Controller Area Network Protocol), and the DCU <NUM> is connected to a switch module <NUM> with hard wires. The switch module <NUM> represents any switch in <FIG> or <FIG>.

As shown in <FIG>, the battery current sampling unit <NUM> is connected to the power battery <NUM>, and the motor driver module <NUM> is connected to the sampling units <NUM>,<NUM>, and <NUM>.

A current sensor may be used to acquire current sampling signals. For example, the positive or negative pole of the power battery <NUM> may be connected in series to the current sensor, and current sensors may also be arranged at the input positive pole of the motor driver module <NUM> and the three-stage outputting three-phase electricity. The battery current sampling units <NUM> and <NUM> acquire the sampling signals of the power battery <NUM> and the motor driver module <NUM>; the switch voltage sampling unit <NUM> acquires the voltage sampling signals of the switch module <NUM>; and the current sampling signals acquired by such electrical device as the water cooling unit <NUM>, air conditioner <NUM>, the oil pump DC/AC <NUM> and the air pump DC/AC <NUM> are transmitted to the DCU <NUM> through CAN bus wires, and then the DCU <NUM> performs calculations and judgment according to these sampling signals to control the switch module <NUM> and the current attacked to the electrical device from the power battery <NUM>. For example, when the total current provided by the power battery <NUM> is reduced, the DCU <NUM> may turn off the current supply of a portion of electrical device so as to achieve rational distribution.

In this embodiment, the DCU <NUM>, with centralized control functions, is connected to the electrical device and the sampling units with signal wires, such as CAN. The DCU receives sampling signals from the electrical device and the current sampling unit, and then sends control signals to the electrical device and the current sampling unit.

As the DCU <NUM> and the switch module <NUM> are connected with hard wires, signals may be transmitted fast between the DCU <NUM> and the switch module <NUM>, as a result of which the response time is shortened greatly and fast control of the switch module is realized, and also loss and delay of communication may be avoided and the fault rate may be reduced.

<FIG> is a DCU architecture diagram of the electric vehicle control system according to some embodiments of this application.

<FIG> lists the functions that may be realized by the electric vehicle control system <NUM> of this embodiment.

As shown in <FIG>, the DCU <NUM> is provided with a control chip <NUM> which is a central control device of the DCU <NUM>, and the control chip <NUM> is provided with a processor <NUM>, an arithmetic unit <NUM>, a storage unit <NUM>, and a communication unit <NUM>.

The DCU <NUM> also includes a digital input sampling unit <NUM>, an analog input sampling unit <NUM>, a digital output control unit <NUM>, and a PWM output control unit <NUM>. The analog input sampling unit <NUM> and the digital input sampling unit <NUM> input the sampling signals sent by the signal sampling units into the control chip <NUM> in the form of analog signals and digital signals respectively, and through the calculations and processing of the arithmetic unit <NUM> and the processor <NUM>, the sampling signals are output by the digital output control unit <NUM> or the PWM output control unit <NUM>. The storage unit <NUM> is intended for storing information data.

The digital sampling signals generally come from the relays, steering control, key operation, gear operation, an accelerator/brake pedal, power mode switch, and the like. The analog sampling signals generally come from temperature sampling, pedal position sampling, air pressure sampling, and the like. The PWM output control unit <NUM> outputs the control signals to the compressor, the water pump, the fan, and the like.

In <FIG>, the functions of the DCU <NUM> are listed around the DCU <NUM>. Taking the integrated monitoring function as an example, for example, when conducting temperature monitoring, the temperature sensor will send temperature signals to the DCU <NUM>, and the DCU <NUM> will interact with the temperature sensor to transmit information.

The main drive relay control and high voltage electrical device relay control in the power distribution functions relate to the power-on and power-off of the electric vehicle.

Among the functions of the DCU <NUM>, the functions with BMS involved include: power battery SOC/SOP/SOH calculation and charging control included in the function of power output and calculation control; emergency high-voltage power outage included in the function of driving intention recognition; insulation monitoring, high voltage inter-lock, power battery cell voltage, power battery cell/module temperature, power battery pack cell equalization, power battery pack output and total current/voltage included in the function of integrated monitoring; the vehicle low-voltage power control and charging control included in the function of energy management; power battery water cooling control and power battery water thermal control included in the function of integrated thermal management; and the like.

Among the functions of the DCU <NUM>, the functions with MCU involved include: motor temperature/rotor position and motor phase current/phase voltage included in the function of integrated monitoring; rotating speed/torque control, inverter power calculation, motor three-phase bridge arm control, motor feedback and precision adjustment included in the function of power output calculation and control; and the like.

Among the functions of the DCU <NUM>, the functions with VCU involved include: the vehicle state acquisition function; pedal operation calculation included in the function of power output calculation and control; energy management function; key operation, gear operation, accelerator/brake pedal, power mode switch, and power output calculation included in the function of driving intention recognition; and endurance mileage calculation included in the control function; and the like.

In this embodiment, the DCU <NUM> integrates the functions of the VCU, the BMS, the PDU, and the MCU, thus the problems that a plurality of controllers, with independent management and control, perform complex communication and control strategy mutually may be avoided. Therefore, the electric vehicle control system <NUM> with simple structure in this embodiment is capable of simplifying the wiring, the control strategy and the communication manner, and reducing the risk of faults in a fast and efficient manner.

In this embodiment, the DCU <NUM> acquires sampling signals, and the internal arithmetic unit <NUM> performs calculations and the processor <NUM> performs logical judgment to determine the control strategy. Therefore, the control system <NUM> of the electric vehicle in this embodiment, with centralized control capacity and fast response, is capable of conducting energy management and power distribution of the vehicle better.

For comparison, <FIG> is a structural schematic diagram of a vehicle control system in the prior art.

As shown in <FIG>, the vehicle control system <NUM> in the prior art is provided with a BMS <NUM>, a VCU <NUM>, a PDU <NUM>, and an MCU606. The BMS <NUM> is connected to the VCU <NUM>, and the VCU <NUM> is connected to the PDU <NUM> and the MCU606.

The BMS <NUM> is connected to the battery current sampling unit <NUM>, the battery voltage sampling unit <NUM> and the battery temperature sampling unit <NUM>, as well as the main switch <NUM>. The battery current sampling unit <NUM>, the battery voltage sampling unit <NUM> and the battery temperature sampling unit <NUM> acquire the current, voltage and temperature information of the power battery <NUM> and send the sampling signals to the BMS <NUM>. The BMS <NUM> transmits the current, voltage and temperature information of the power battery <NUM> to the VCU <NUM>, and the VCU <NUM> performs calculations and judgment, and according to the judgment results, the PDU <NUM> is instructed to control the on/off of the <NUM>st switch <NUM>, the 2nd switch <NUM> and the Nth switch <NUM>, and the BMS <NUM> is instructed to control the current supplied by the power battery <NUM> to each electrical device.

The PDU <NUM> is connected to the <NUM>st switch <NUM>, the 2nd switch <NUM>, and the 3rd switch <NUM> through the switch voltage sampling unit <NUM>. The switch voltage sampling unit <NUM> acquires the voltage signals of the <NUM>st switch <NUM>, the 2nd switch <NUM>, and the Nth switch <NUM> and sends the sampling signals to the PDU <NUM>. The PDU <NUM> sends the sampling signals of the <NUM>st switch <NUM>, the 2nd switch <NUM>, and the Nth switch <NUM> to the VCU <NUM>. And then the VCU <NUM> performs calculations and judgment, and according to the judgment results, the <NUM>st switch <NUM>, the 2nd switch <NUM>, and the Nth switch <NUM> are controlled directly or through the PDU <NUM>.

The MCU <NUM> is connected to the motor driver module <NUM> through the current sampling unit <NUM>, the voltage sampling unit <NUM> and the temperature sampling unit <NUM>. The current sampling unit <NUM>, the voltage sampling unit <NUM> and the temperature sampling unit <NUM> acquires the current, voltage and temperature information of the motor driver module <NUM>, and sends the sampling signals to the MCU <NUM>. And the MCU <NUM> transmits the current, voltage and temperature information of the motor driver module <NUM> to the VCU <NUM>. The VCU <NUM> performs calculations and judgment, and according to the judgment results, the motor driver module <NUM> is instructed to control the motor, for example, the electrodes are instructed to output such drive signals as torque and rotating speed.

As mentioned above, in the prior art, the VCU, the BMS, the PDU and the MCU conduct independent management and control and perform complex communication and control strategy mutually, resulting in slow response and high fault rate.

For comparison, <FIG> is a schematic diagram of high-voltage power distribution of a vehicle control system in the prior art.

The vehicle control system <NUM> shown in <FIG> is provided with the BMS <NUM>, the VCU <NUM>, the PDU <NUM> and an electrode controller <NUM>. The PDU <NUM>, and the electric defroster relay K5, the air conditioner and the warm-air blower relay K7, the auxiliary drive relay K7 of the oil pump DC/AC <NUM> and the air pump DC/AC <NUM>, DC/DC relay K8, and the like are arranged in the high-voltage distribution box <NUM>. The PDU <NUM>, by controlling the electric defroster relay K5, the air conditioner and warm-air blower relay K7, the auxiliary drive relay K7 of the oil pump DC/AC <NUM> and the air pump DC/AC <NUM>, and DC/DC relay K8, performs high-voltage control of such electric components as the water cooling unit <NUM>, the electric defroster <NUM>, the electric air conditioner <NUM>, the electric warm-air blower <NUM>, the oil pump DC/AC <NUM>, the air pump DC/AC <NUM>, and the DC/DC <NUM>.

The BMS <NUM>, and the general negative relay K0 connected with the negative pole of the power battery <NUM>, the positive charging relay K1 connected with the positive pole of the charging port <NUM>, the positive-side main relay K2 connected with the positive pole of the motor control unit <NUM>, the precharging relay K3, the water cooling unit relay K4, and the like are arranged in the BMS distribution box <NUM>. The BMS <NUM> mainly performs high-voltage control of the motor driver module <NUM> (inverter) of the motor control unit <NUM>.

In the prior art, the VCU <NUM> and the BMS <NUM> are equipped with a high voltage distribution box respectively, with complex electrical topology and various wires. The VCU <NUM> and the BMS <NUM> interact with each other through CAN information and perform logical judgment mutually and then the relay is closed, as a result of which the power-on and power-off operation takes a long time. The information interactive communication between the VCU <NUM> and the BMS <NUM>, on a software execution level, requires communication protocols, so there may be risks and situations of loss and delay of communication, thus affecting the information interaction between the two. As a result, the power-on (high voltage startup) operation fails and the vehicle fails to start normally, which affects user experience.

In the electric vehicle control method described in the embodiment of this application, the electric vehicle is provided with the DCU <NUM>, and the control method includes that the DCU <NUM> receives the sampling signals of the power battery <NUM> and the electrical device <NUM> and <NUM> and manages and controls the power battery <NUM> and the electrical device <NUM> and <NUM> according to the sampling signals.

That is, the DCU <NUM> integrates the functions of the BMS, the MCU and the VCU in the prior art, thus the control strategy and the communication manner are simplified, the time of receiving and sending data is saved, the capability of processing comprehensive data is improved, power-on and power-off time is reduced, and the fault rate is reduced.

In some possible embodiments, the DCU <NUM> receives the sampling signals from the switch module <NUM> and controls the on/off operation of the switch module <NUM> according to the sampling signals.

The DCU <NUM> further integrates the functions of the PDU, thus the electric vehicle control method in this embodiment further simplifies the control strategy and the communication manner.

In some possible embodiments, the DCU <NUM> detects the state of the electrical device <NUM>, <NUM>, and <NUM> and performs calculations of the test data to determine the control strategy for these electrical devices.

That is, the DCU <NUM> performs internal calculations and logical judgment, and the calculation results may be shared. Thus, the procedures that each controller processes and then transmits data individually in the prior art are eliminated, and the comprehensive processing capacity is greatly improved, and it is not needed to formulate complex communication protocol and control strategy.

In some possible embodiments, the DCU <NUM> is connected to the electrical device and the current sampling unit with signal wires, and to the switch module <NUM> with hard wires.

The DCU <NUM> is connected to switch module <NUM> with hard wires, thus signals may be transmitted fast and fast control of the switch module may be achieved.

In some possible embodiments, the electrical devices include the oil pump DC/AC <NUM>, the air pump DC/AC <NUM>, the electric air conditioner <NUM>, the electric warm-air blower <NUM>, the electric defroster <NUM>, the water cooling unit <NUM>, the DC/DC <NUM>, and the like.

That is, the DCU <NUM> controls the above electrical device and optimizes the high-voltage power distribution and control of the vehicle.

The electric vehicle control system and the control method in the above embodiment of the invention are capable of optimizing the power-on process, the power-off process, and the charging process of the electric vehicle. A detailed description is given below.

<FIG> is a flow diagram of the power-on method of the electric vehicle according to some embodiments of this application.

In an electric vehicle power-on method <NUM> in the embodiments of this application, the electric vehicle is provided with the DCU <NUM>. The DCU <NUM> receives sampling signals of the power battery <NUM>, the switch module <NUM> and electrical device <NUM>, <NUM>, and <NUM> and manages and controls the power battery <NUM>, the switch module <NUM>, and electrical device <NUM>, <NUM>, and <NUM> according to the sampling signals.

As shown in <FIG>, the power-on method <NUM> in this embodiment includes the following steps:.

The vehicle's proceeding to a high voltage state mainly refers to the motor <NUM>'s proceeding to a high voltage state; the DCU <NUM> sends instructions to close the water cooling unit relay K5, the electric defroster relay K6, the air conditioning warm-air blower relay K7, and the auxiliary drive relay K8; that is, all relays are closed, and the water cooling unit loop, the electric defroster loop, the air conditioning warm-air blower loop, and the auxiliary drive loop are turned on, and high voltage power-on operation of the vehicle is completed. s8115, permitting vehicle traveling and entering a ready state.

In s8106, after the relay contact diagnosis is completed, the DCU <NUM> internally reads the information of the electrical device <NUM> and <NUM>, for example, the information includes the electrical device to be turned on, and the rated power of each electrical device; and according to the rated power and weight value of different electrical device, calculations are performed with reference to the State of Charge (SOC), and then according to the calculation results whether it is needed to conduct power distribution control processing on some electrical device is determined, thus the high voltage distribution is completed.

In s8107, the power-on conditions include:.

According to the power-on method in the above embodiment, the DCU <NUM> integrates the functions of the BMS, the VCU, the PDU and the MCU. The DCU <NUM> directly controls relays, thus the control capability is centralized and the response is fast, and the situation in the prior art that the VCU <NUM>, the BMS <NUM> and the PDU <NUM> work independently and perform complex communication and control strategy between each other in the power-on process is simplified. In this embodiment, the DCU <NUM> detects and calculates the power-on conditions and makes logical judgment, and the calculation results are shared, thus the link in the prior art that each controller transmits data to each other and the VCU <NUM> makes judgment is eliminated. Therefore, the power-on method in this embodiment, with simple communication manner and fast response, is capable of shortening the power-on time and reducing the fault rate.

<FIG> is a flow diagram of the power-off method of the electric vehicle according to some embodiments of this application.

In an electric vehicle power-off method <NUM> in some embodiments of this application, the electric vehicle is provided with the DCU <NUM> as mentioned above. And the DCU <NUM> receives sampling signals from the power battery <NUM>, the switch module <NUM>, and electrical device <NUM>, <NUM>, and <NUM>, and according to the sampling signals, manages and controls the power battery <NUM>, the switch module <NUM>, and electrical device <NUM>, <NUM>, and <NUM>.

There are two power-off manners: passive power-off and active power-off. The DCU <NUM> sends a power-off instruction for power-ff operation due to a fault or in other emergencies, which is passive power-off; and the DCU <NUM> accepts an instruction and actively sends a power-off request for power-off operation, which is active power-off. <FIG> shows a flow diagram of a passive power-off method according to some embodiments of this application.

As shown in <FIG>, the power-off method <NUM> in this embodiment includes the following steps:
S9201, determining, by the DCU <NUM>, whether the vehicle sends a power-off request due to a fault forbidding power-on or a fault occurring in DCU <NUM> itself, if not, repeating s10201; if yes, proceeding to s9202.

S9202, sending, by the DCU <NUM>, the power-off instruction to start the power-off process.

S9203, detecting, by the DCU <NUM>, whether the current of the major loop is less than the set threshold value, for example, setting the threshold value as 15A, if not, repeating s9203; if yes, proceeding to s9204.

The set threshold value of the major loop current is generally not greater than <NUM> A. When the DCU <NUM> detects whether the major loop current is less than the set threshold value, if the major loop current is less than the set threshold value, the power-off operation may be performed. Power-off with load should be avoided, otherwise the performance of the vehicle devices may be affected.

S9204, sending, by the DCU <NUM>, a disconnection command to the positive-side main relay K3 to turn off the motor drive loop;.

According to the power-off method in the above embodiment of this application, the DCU <NUM> directly controls relays, thus the control capability is centralized and the response is fast, and the links in the prior art that the VCU <NUM>, the BMS <NUM>, and the PDU <NUM> work independently and perform complex communication and control strategy mutually are simplified. Therefore, the power-off method in this embodiment, with simple communication manner and control strategy, is capable of shortening the power-off time and reducing the fault rate.

<FIG> is a flow diagram of the power-off method of the electric vehicle according to other embodiments of this application.

<FIG> shows a flow chart of the active power-off method in some embodiments of this application.

As shown in <FIG>, the power-off method <NUM> in this embodiment includes the following steps:.

For example, if the threshold value is set as <NUM> A and the major loop current is greater than the threshold value, repeat s1104; if less than the threshold value, proceed to s1105. The threshold value of the major loop current is generally set not greater than <NUM> A.

According to the power-off method in the above embodiment of this application, the DCU <NUM> directly controls relays, thus the control capability is centralized and the response is fast, and the links in the prior art that the VCU, the BMS, and the PDU work independently and perform complex communication and control strategy mutually are simplified. Therefore, the power-off method in this embodiment, with simple communication manner and control strategy, is capable of shortening the power-off time and reducing the fault rate.

<FIG> (<FIG> followed by <FIG>) is a flow diagram of the charging method of the electric vehicle according to some embodiments of this application.

A charging device described in the embodiments of this application may be an ordinary charging pile, a super charging pile, a charging pile supporting the mode of vehicle to grid (V2G), or a charging and discharging device capable of charging and discharging a power battery, and the like. The specific types and application scenarios of the charging devices are not limited in the embodiments of this application.

In an electric vehicle charging method <NUM> in the embodiments of this application, the electric vehicle is provided with the DCU <NUM> as mentioned above. The DCU <NUM> receives the sampling signals from the power battery <NUM>, the switch module <NUM>, and electrical device <NUM>, <NUM>, and <NUM>, and manages and controls the power battery <NUM>, the switch module <NUM>, and electrical device <NUM>, <NUM>, and <NUM> according to the sampling signals.

As shown in <FIG>, the charging method <NUM> includes the following steps:.

Conditions for ending charging are as follows:.

s1221, the DCU <NUM> sends an instruction to stop charging.

For example, the DCU <NUM> detects whether the charging state reaches the conditions to end (SOC reaches <NUM> or the set value), and if yes, send an instruction to end charging.

CC1 is a function that an off-vehicle charger keeps monitoring the connection status between the charging plug and the charging socket by checking an input voltage signal of a contact of connection in a charging process, and, once the connection status is abnormal, turns off the output of the direct current power supply immediately and turns off the switch after completion of unloading.

CC2 is a function that the off-vehicle charger also turns off the output of the direct current power supply accordingly if no battery charging level (BCL) request message <NUM> sent by the battery management system BMS <NUM> periodically is received by the off-vehicle charger within <NUM> in the charging process.

In the charging method in the above embodiment of this application, the DCU <NUM> directly controls relays with centralized control capability and fast response and simplifies the situation in the prior art that the VCU <NUM>, the BMS <NUM>, and the PDU <NUM> work independently and carry out complex communication and control strategy between each other. Therefore, the charging method in this embodiment, with simple communication manner and control policy, is capable of reducing faults.

In the computer readable storage medium in the embodiments of this application, there are stored computer executable instructions. When the processor processes the computer executable instructions, any method in the above embodiments will be performed.

Claim 1:
An electric vehicle control system (<NUM>), comprising:
a domain control unit (<NUM>) configured to control an electric vehicle;
a current sampling unit (<NUM>) configured to sample current of a power battery (<NUM>) and a motor driver module (<NUM>) of the electric vehicle, and send sampling signals to the domain control unit (<NUM>);
an electrical device (<NUM>), driven by the power battery (<NUM>), configured to sample current flowing through the electrical device (<NUM>) and send sampling signals to the domain control unit (<NUM>);
a switch module (<NUM>) configured to turn on or off power supply circuits of the electrical device (<NUM>) and the motor driver module (<NUM>); and
a voltage sampling unit (<NUM>) configured to sample voltage of the switch module (<NUM>) and send sampling signals to the domain control unit (<NUM>),
wherein the domain control unit (<NUM>) is configured to manage the power battery (<NUM>) and control the motor driver module (<NUM>) and the electrical device (<NUM>) according to the sampling signals sent by the electrical device (<NUM>) and the current sampling unit (<NUM>), and
the domain control unit (<NUM>) is configured to perform on or off control of the switch module (<NUM>) according to the sampling signals sent by the voltage sampling unit (<NUM>),
characterized in that
the domain control unit (<NUM>) is connected to the electrical device (<NUM>) and the current sampling unit (<NUM>) with signal wires, and
the domain control unit (<NUM>) is connected to the switch module (<NUM>) with hard wires.