Patent Description:
Large worksites typically have more than one charging point for electric work vehicles. The charging points may be at the same location or at different locations.

An operator of an electric work vehicle may not know the location of the charging points, particularly if the charging point locations vary between worksites or if the charging points are mobile. The operator may waste time and charge travelling to look for a charging point. An operator of an electric work vehicles may travel to a charging point in order to charge without knowledge of any properties of the charging point, and so risk not being able to charge. For example, the charging point may be in use by another vehicle, low on power or charge, out of order, the wrong type of charging point, or otherwise unusable. In the event that an electric work vehicle cannot charge at the charging point, the electric work vehicle may be required to wait or to travel to a different charging point.

<CIT> describes a method for forecasting availability of at least one charging station for an electric vehicle. A specific charging requirement is determined for a plurality of electric vehicles. Each of the electric vehicles issues a request regarding the availability of at least one charging station depending on the specific charging requirement. A real demand for a charging process is estimated for the at least one charging station based on the requests of the electric vehicles, and from this a first probability for the availability of the at least one charging station at a future point in time is determined.

<CIT> describes a travelling energy distribution system that includes a plurality of supply facilities each of which is able to supply travelling energy to a vehicle. The system includes an information acquisition unit configured to acquire, from a vehicle, vehicle information relevant to an amount of travelling energy remaining in the vehicle and acquire, from each of the plurality of supply facilities, supply facility information relevant to an amount of travelling energy that can be supplied from that supply facility. The system includes a determination unit configured to determine a transfer source supply facility and a transfer destination supply facility for travelling energy to be transferred from among the plurality of supply facilities and determine an amount of the travelling energy to be transferred based on the vehicle information and the supply facility information acquired by the information acquisition unit.

<CIT> describes a charging support system and method for an electric vehicle. A control center detects a specific electric vehicle that needs to be charged in order to reach a destination from a current location of the electric vehicle on the basis of prescribed electric vehicle information obtained from each electric vehicle, detects a specific charging station that is available for the specific electric vehicle on the basis of information on the specific charging station among multiple charging stations and the electric vehicle information on the specific electric vehicle, detects a specific route for navigating the specific electric vehicle to the specific charging station, and transmits specific navigation information, which includes the specific route, to the specific electric vehicle.

<CIT> describes a system and method for charging machines. The method includes causing, with a controller, operation of a first compaction machine at a worksite based at least in part on a worksite plan. The method also includes determining, with the controller, a return path extending from a current location of the first machine to a charging zone located at the worksite, and determining, with the controller, a return power required for the first machine to traverse the return path. The method further includes causing, with the controller, the first machine to traverse the return path, from the current location to the charging zone, based on at least one of the return power and an amount of available power stored in an energy storage device of the first machine.

<CIT> describes a system and method for charging electric vehicles (EVs). A computer-based system is described for managing energy supply and demand at an EV charging facility, which charging facility may comprise a plurality of EV charge points. The system comprises a data capture module configured to receive data representative of a number of EVs, including EV charge status and EV location. An energy supply and demand processing unit determines a subgroup of the EVs and corresponding prospective customers based on said received data. An EV charge offer module is configured to issue EV charge offers for the benefit of the EV customers in the subgroup. These EV charge offers each include at least a proposed EV charge time and may also include an allocated EV charge point.

<CIT> describes a reservation-based charging service for electric vehicles. An electric vehicle transmits a reservation request message including the information on a current position and a battery to a reservation charge server and receives the information of a charging station from the reservation charge server. The electric vehicle transmits a reservation acceptance message to the reservation request server. The charging stations transmits the information of the charging station including the position of the charging station, sale prices, a charging schedule, and power situation of the charging station to the reservation charge server. The charging stations receive the reservation acceptance message from the reservation charge server and add the electric vehicle for reservation in the charge schedule. The reservation charge server receives and stores the information of the charging station from the charging station, receives the reservation request message from the electric vehicle, compares and analyzes the power situation of the charging station and a battery property of the electric vehicle, removes the charging station which is unsuitable for conditions, arranges the rest of the charging station by arranging the same by the distance, the sale price, and expected waiting time for charging in an ascending order, searches the optimal charging station, transmits the information of the searched charging station to the electric vehicle, and transmits the reservation acceptance message to the charging station by receiving the reservation acceptance message from the electric vehicle.

<CIT> describes a charging method applied to a server. The server collects position information and working state information of multiple battery charging stations. The charging method comprises the steps of receiving a charging request of an electric vehicle; obtaining position information, power capacity information and running path information of the electric vehicle; selecting one target battery charging station from multiple target battery charging stations according to position information and working state information of the multiple target battery charging stations in a surrounding area of the electric vehicle and the position information, the power capacity information and the running path information of the electric vehicle; and transmitting the position information of the target battery charging station to the electric vehicle so that the electric vehicle runs to the target battery charging station to execute charging operation.

<CIT> describes a system and method for presenting electric vehicle charging options. The system and method include determining at least one charging station that is within a remaining distance that the electric vehicle is capable of travelling based on the current geo-location of the electric vehicle and the current state of charge of the battery of the electric vehicle. The system and method further include presenting a charging station map user interface that pin points the current geo-location of the electric vehicle and the at least one charging station. One or more of the charging stations are presented with labels. The system and method further include reserving the at least one charging station for charging the electric vehicle by selecting one or more particular user interface selectable geo-locations that are presented on the charging station map user interface.

<CIT> describes a battery charging station and method of use. The charging station includes a plurality of charge ports and a plurality of power stages where each stage provides a portion of the station's maximum available charging power. A switching system couples the output of the power stages to the charging ports based on charging station and vehicle conditions as well as a predefined set of power distribution rules. Current charging station and vehicle conditions may include vehicle arrival time, usage fees, vehicle/customer priority information, SOC, and intended departure time. The method includes the steps of monitoring and determining battery charging station conditions, determining power distribution for the battery charging station and the charging ports in response to the current charging conditions and in accordance with a predefined set of power distribution rules, and coupling the power stages to the charging ports in accordance with the power distribution.

A method of charging management for electric work vehicles according to the invention and a.

charging management device for electric work vehicles according to the invention are both defined by the appended claims.

A specific embodiment of the invention will now be described, by way of example only, with reference to the accompanying drawings in which:.

Electric work vehicles commonly operate off road at work sites, for example on construction sites or at mining sites. The plurality of electric work vehicles at the work site will need to be charged. In order to efficiently charge the electric work vehicles, the electric work vehicle and charging module need to communicate. For example, communicating a status of a charging module to an electric work vehicle prevents the electric work vehicle wasting time and charge travelling to a charging module that is in use by another electric work vehicle, that is low on power or charge, or that is otherwise unusable. Communicating the location of the charging modules, which may differ between work sites or even over time in the same work site, means that the electric work vehicles can travel efficiently to the charging module. Similarly, communicating properties of the electric work vehicles to the charging modules allows efficient charging of the electric work vehicles, for example by ensuring that the electric work vehicle travels to a charging module that can provide at least the amount of charge required by the electric work vehicle.

Recharging an electric work vehicle can be time consuming, and queues may form at charging modules. Communication between the charging module and the electric work vehicle allows the electric work vehicle to travel to a charging module that is or that soon will be available.

With reference to <FIG>, a method of charging management for electric work vehicles comprises communicating charger properties <NUM> from a charging module <NUM> to an electric work vehicle <NUM> and communicating vehicle properties <NUM> from the electric work vehicle <NUM> to the charging module <NUM>. Charging information <NUM> is provided to an operator. The charging information <NUM> is based on the charger properties <NUM> and the vehicle properties <NUM>. The charger properties <NUM> comprise a location of the charging module <NUM> and an availability of the charging module <NUM>. The vehicle properties comprise a current state of charge of a battery of the electric work vehicle and a capacity of the battery of the electric work vehicle.

Communicating charger properties <NUM> to the electric work vehicle <NUM> and communicating vehicle properties <NUM> to the charging module <NUM> may occur at the same time, or sequentially in either order. The charger properties <NUM> and vehicle properties <NUM> may be communicated continuously or at regular intervals. The charger properties <NUM> and vehicle properties <NUM> may alternatively be communicated on demand, for example in response to a request by an operator. The charger properties <NUM> and vehicle properties <NUM> may be communicated directly between the charging module <NUM> and the electric work vehicle <NUM>. With reference to <FIG>, the charger properties <NUM> and vehicle properties <NUM> may be communicated between the charging module <NUM> and the electric work vehicle <NUM> via a central controller <NUM>. The central controller may provide the charging information <NUM>.

The charging module <NUM> and the electric work vehicle <NUM> may each comprise a telematics module. The telematics modules may be configured to send and receive the charger properties <NUM> and the vehicle properties <NUM>.

The electric work vehicle <NUM> may communicate vehicle properties <NUM> to and receive charger properties <NUM> from more than one charging module <NUM>. The charging module <NUM> may communicate charger properties <NUM> to and receive vehicle properties <NUM> from more than one electric work vehicle <NUM>.

The charging module may comprise a mains supply, or may not be connected to the mains supply. The charging module may comprise a power pack. The charger may comprise a generator.

The charger properties <NUM> may further include a health status of the charger. For example, whether the charger is working, and whether there is any damage to the charger or limited capability of the charger. The charger properties <NUM> may further comprise a charging capacity of the charger. For example, in the event that the charger is not connected to the mains supply, it may have a limited amount of charge available. The charging capacity may comprise a state of charge of power pack. In an embodiment, the charging capacity may comprise either an indication that the charger has sufficient charge to fully charge the battery, or an indication of the predicted state of charge of the battery after fully draining the charger. The charger properties <NUM> may further comprise a charging rate of the charger, and a charger connection type (such as DC, AC, three phase).

The charger properties <NUM> comprise an availability of the charging module <NUM>. The availability of the charging module <NUM> may comprise an indication of whether the charger is in use and a reservation status of the charger. For example, the charger may be currently in use, currently free, reserved for use at a certain time by another vehicle, or unreserved. In an event that the charger is in use, the availability of the charging module <NUM> may further comprise a predicted charging end time at which the charger will be available. Similarly, in an event that the charger is reserved, the availability of the charging module <NUM> may further comprise a period when the charger is free prior to the reservation and/or a predicted end time of the reservation.

The predicted charging end time may be communicated from the charger to the electric work vehicle <NUM>. The predicted charging end time may be calculated by the electric work vehicle <NUM> or central controller based on a current state of charge of the battery being charged, a target state of charge of the battery being charged, and a charging rate of the charger. In an event that the charger is not connected to the mains supply, the charger properties <NUM> may further comprise a predicted state of charge of the charger at the predicted charging end time.

In an embodiment, the charger may comprise a DC charger and the charger properties may further comprise a DC voltage of the charger.

The vehicle properties <NUM> may further comprise a predicted time before charging is required. The predicted time may be based on at least one of a current state of charge, a discharge rate, and a distance from the charger. The discharge rate may be based on a current discharge rate. The discharge rate may be based on data from previous discharging of the battery, for example data comprising discharge rates at different states of charge, or discharge rates for the operator, or discharge rates for performing various tasks with the vehicle. The distance from the charger may be used to calculate the state of charge required to travel to the charger, and therefore the minimum state of charge that the vehicle can reach before needing to travel to the charger.

The vehicle properties <NUM> may further comprise an available time period for charging. The available time may be based on a return-to-work time for the electric work vehicle <NUM>. For example, the electric work vehicle <NUM> may be charged at the end of an operator's shift, and the return-to-work time may comprise the beginning of the next shift for the electric work vehicle <NUM> (for the same or a different operator). Otherwise, an available time period may comprise a lunch break of the operator, a weekend, a closed period of the worksite, or other time period.

The vehicle properties <NUM> may further comprise a target state of charge for charging the battery. For example, the target state of charge may be to fully charge the battery to a <NUM>% state of charge. The target state of charge may comprise a state of charge that has been determined to be appropriate to maintain good battery health. The target state of charge may be the state of charge required to complete the next task or the next shift.

The vehicle properties <NUM> may further comprise at least one of a battery voltage, a maximum charge rate of the battery, a state of health of the battery, and a temperature of the battery.

The charging module <NUM> may comprise a geofence. The geofence may define a perimeter around the charging module <NUM>, for example based on a radius from the charging module <NUM>. Within the geofence, a speed of the electric work vehicle <NUM> may be limited to below a threshold speed, and/or the electric work vehicle <NUM> may be limited in the tasks it can perform. There may be other limitations, such as the number of electric work vehicles permitted to be within the geofence at any one time. The charger properties may further comprise the geofence and any limitations on the electric work vehicle <NUM> that occur within the geofence.

In an embodiment, the charging information <NUM> provided to the operator may comprise information to allow the operator to make an informed charging decision. For example, the charging information <NUM> may comprise the predicted time before charging is required and distances to available charging modules. In another embodiment, the charging information <NUM> provided to the operator may comprise a result of a charging decision made by a controller (either the central controller or a controller of the electric work vehicle). For example, the controller may decide which charging module <NUM> the electric work vehicle <NUM> should travel to, and when the electric work vehicle <NUM> should travel to or arrive at the charging module.

The method may further comprise making a reservation of the charging module <NUM>. The reservation may be made by the operator based on the charging information <NUM>. The reservation may be suggested to the operator by a controller based on a charging decision made by the controller, and the operator may confirm or reject the reservation. The reservation may be made by a controller based on a charging decision made by the controller, without input from the operator.

The method of charging management may comprise communicating charger properties <NUM> from a plurality of charging modules <NUM> to an electric work vehicle <NUM>. The charging information <NUM> may be based on the charger properties <NUM> for the plurality of charging modules <NUM>, such that the charging decision (made by the operator or a controller) comprises a decision of whether or when to charge the electric work vehicle, and which charging module to use.

The charging information <NUM> may be provided to the operator via a display in the electric work vehicle cab, via a smartphone, or by other means.

According to an embodiment, there is a charging management device for electric work vehicles. The charging management device is configured to communicate charger properties <NUM> from a charging module <NUM> to an electric work vehicle and communicate vehicle properties <NUM> from the electric work vehicle <NUM> to the charging module <NUM>. The charging management device is further configured to provide charging information <NUM> to an operator, wherein the charging information <NUM> is based on the charger properties <NUM> and the vehicle properties <NUM>. The charger properties <NUM> comprise location of the charging module <NUM> and an availability of the charging module <NUM>. The vehicle properties <NUM> comprise a current state of charge of a battery of the electric work vehicle <NUM> and a capacity of the battery of the electric work vehicle <NUM>.

Claim 1:
A method of charge management for electric work vehicles, the method comprising:
communicating charger properties (<NUM>) from a charging module (<NUM>) to an electric work vehicle (<NUM>);
communicating vehicle properties (<NUM>) from the electric work vehicle (<NUM>) to the charging module (<NUM>); and
providing charging information (<NUM>) to an operator, wherein the charging information (<NUM>) is based on the charger properties (<NUM>) and the vehicle properties (<NUM>);
wherein the charger properties (<NUM>) comprise:
a location of the charging module (<NUM>); and
an availability of the charging module (<NUM>); and
wherein the vehicle properties (<NUM>) comprise:
a current state of charge of a battery of the electric work vehicle (<NUM>);
a capacity of the battery of the electric work vehicle (<NUM>); and
an available time period for charging based on a return-to-work time of the electric work vehicle (<NUM>);
characterised in that the vehicle properties further comprise:
a predicted time before charging is required, wherein the predicted time is based on data from previous discharging of the battery of the electric work vehicle (<NUM>) comprising one or more of:
discharge rates at different states of charge;
discharge rates for the operator; and
discharge rates for performing various tasks with the electric work vehicle (<NUM>).