A control method and device for DC V2V discharge

Abstract

The present application provides a method and device for controlling DC V2V discharge, which relates to the field of vehicle technology. The method includes: obtaining the current battery voltage of the charging vehicle when a DC V2V conductive connection component is connected between the charging vehicle and the discharging vehicle; adjusting the output voltage of the discharging vehicle to a target voltage range by controlling the capacitor voltage of the original capacitor in the transmission circuit, the target voltage range includes the current battery voltage; when the battery is disconnected from the transmission circuit, controlling the voltage-adjusted transmission circuit of the discharging vehicle to be connected to the transmission circuit of the charging vehicle; when the transmission circuit of the discharging vehicle is connected to the transmission circuit of the charging vehicle, discharging the charging vehicle using a range extender. The technical solution provided in the embodiments of the present application can reduce the cost of DC V2V discharge.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a control method and device for direct current V2V discharge. Background Art

[0002] During the development of extended-range hybrid vehicles (RELHEVs), V2V discharge technology has gained popularity due to its positive impact on roadside assistance for new energy vehicles and vehicle-to-vehicle energy interaction between owners. Furthermore, DC V2V discharge technology, which enables high-power charging between the discharging and charging vehicles, is highly practical. However, a significant voltage difference between the charging and discharging vehicles can cause the vehicle to report an overvoltage fault and exit the discharge process. Consequently, aligning the voltage of the discharging and charging vehicles has become a core issue in the development of RELHEV DC V2V discharge technology.

[0003] One related technique involves adding a pre-charging circuit to the high-voltage circuit of the discharging vehicle. This involves adding two or three high-voltage contactors and a pre-charging resistor to align the voltage of the discharging vehicle with that of the charging vehicle after voltage division by the pre-charging resistor. However, this technique requires additional circuitry, increasing the cost of DC V2V charging. Therefore, a low-cost DC V2V discharging solution for extended-range hybrid vehicles is needed. Summary of the Invention

[0004] In view of the above-mentioned defects or deficiencies in the prior art, the present application aims to provide a control method and device for DC V2V discharge, which can reduce the cost of the DC V2V discharge solution of extended-range hybrid vehicles.

[0005] The control method for DC V2V discharge provided in an embodiment of the present application is applied to a discharging vehicle, wherein the transmission circuit of the discharging vehicle includes a battery and a range extender, and includes the following steps: obtaining the current battery voltage of the charging vehicle when a DC V2V conductive connection component is connected between the charging vehicle and the discharging vehicle; adjusting the output voltage of the discharging vehicle to a target voltage range by controlling the capacitor voltage of an original capacitor in the transmission circuit, wherein the target voltage range includes the current battery voltage; controlling the voltage-adjusted transmission circuit of the discharging vehicle to be conductive with the transmission circuit of the charging vehicle when the battery is disconnected from the transmission circuit; and discharging the charging vehicle using the range extender when the transmission circuit of the discharging vehicle is conductive with the transmission circuit of the charging vehicle.

[0006] According to the technical solution provided in the embodiment of the present application, the original capacitor includes a motor controller support capacitor, and the output voltage of the discharged vehicle is adjusted to a target voltage range by controlling the capacitor voltage of the original capacitor in the transmission circuit, including: discharging the motor controller support capacitor so that the capacitor voltage of the motor controller support capacitor is lower than the current battery voltage (for example, discharging to close to 0V); charging the motor controller support capacitor after the voltage is reduced; and when the voltage of the motor controller support capacitor increases to within the target voltage range, controlling the battery to be disconnected from the transmission circuit.

[0007] According to the technical solution provided in the embodiment of the present application, the supporting capacitor of the motor controller after the voltage is reduced is charged, including: judging whether the discharge duration of the supporting capacitor of the motor controller reaches a preset duration, and the preset duration is greater than the specified discharge duration of the supporting capacitor of the motor controller; when the discharge duration reaches the preset duration, the supporting capacitor of the motor controller after the voltage is reduced is charged.

[0008] According to the technical solution provided in the embodiment of the present application, the power transmission circuit of the discharging vehicle also includes a pre-charge contactor, which controls the battery to be disconnected from the power transmission circuit, including: obtaining the disconnection delay of the pre-charge contactor; estimating the voltage change value of the motor controller support capacitor within the disconnection delay; based on the voltage change value, determining the time to issue the disconnection control instruction of the pre-charge contactor, so as to control the battery to be disconnected from the power transmission circuit by controlling the disconnection of the pre-charge contactor through the disconnection control instruction.

[0009] According to the technical solution provided in the embodiment of the present application, the original capacitor includes the equivalent capacitor of the range extender, and the output voltage of the discharging vehicle is adjusted to a target voltage range by controlling the capacitor voltage of the original capacitor in the transmission circuit, including: controlling the battery to be disconnected from the transmission circuit so that the equivalent capacitor and the equivalent resistor of the range extender form a discharge network by disconnecting the battery; reducing the capacitor voltage of the equivalent capacitor through the equivalent resistor in the discharge network; and, when the transmission circuit of the discharging vehicle is connected to the transmission circuit of the charging vehicle, discharging the charging vehicle using the range extender, including: discharging the charging vehicle through the range extender when the capacitor voltage of the equivalent capacitor is reduced to within the target voltage range.

[0010] According to the technical solution provided in the embodiment of the present application, the power transmission circuit of the discharging vehicle also includes high-voltage accessories and a bus; controlling the battery to be disconnected from the transmission circuit includes: controlling the range extender to enter the idle state; after the range extender enters the idle state, controlling the bus current to be lower than a preset current threshold by controlling the high-voltage accessories to shut down; when the bus current is lower than the preset current threshold, controlling the range extender to be in a torque control mode; after the range extender is in the torque control mode, controlling the battery to be disconnected from the transmission circuit.

[0011] According to the technical solution provided in the embodiment of the present application, discharging the charged vehicle through the range extender includes: controlling the range extender to switch from the torque control mode to the normal power generation mode, so as to discharge the charged vehicle through the range extender in the normal power generation mode.

[0012] According to the technical solution provided in the embodiments of the present application, the original capacitor includes the capacitor of the generator controller in the range extender. By controlling the capacitor voltage of the original capacitor in the transmission circuit, the output voltage of the discharged vehicle is adjusted to a target voltage range, including: controlling the battery to be disconnected from the transmission circuit; after the battery is disconnected, controlling the range extender to be in normal power generation mode; and adjusting the voltage of the capacitor of the generator controller to the target voltage range through the range extender in normal power generation mode.

[0013] According to the technical solution provided in an embodiment of the present application, adjusting the voltage of the capacitor of the generator controller to a target voltage range includes: when the voltage of the capacitor of the generator controller is greater than the upper limit value of the target voltage range, lowering the voltage of the capacitor of the generator controller by the range extender in normal power generation mode until the voltage of the capacitor of the generator controller is within the target voltage range; and / or, when the voltage of the capacitor of the generator controller is less than the lower limit value of the target voltage range, increasing the voltage of the capacitor of the generator controller by the range extender in normal power generation mode until the voltage of the capacitor of the generator controller is within the target voltage range.

[0014] An embodiment of the present application further provides an electronic device, comprising: a processor; and a memory for storing executable instructions of the processor; wherein the processor is configured to perform the above-mentioned DC V2V discharge control method by executing the executable instructions.

[0015] In summary, this application proposes a method and device for controlling DC V2V discharge. By controlling the voltage of the existing capacitors in the transmission circuit, the output voltage of the discharging vehicle is adjusted to a target voltage range. This allows the discharging vehicle and the charging vehicle to achieve voltage alignment before the transmission circuit is connected. Furthermore, during subsequent discharge, the range extender can be used to discharge the charging vehicle, aligning the voltages of the discharging vehicle and the charging vehicle in real time. This eliminates the need for additional circuitry to achieve voltage alignment during DC V2V discharge, reducing the cost of DC V2V discharge. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of an exemplary DC V2V discharge system according to an embodiment of the present application is shown;

[0017] Figure 2 A schematic structural diagram of an exemplary power transmission circuit provided in an embodiment of the present application is shown;

[0018] Figure 3 A flow chart of a control method for DC V2V discharge in an embodiment of the present application is shown;

[0019] Figure 4 A schematic flow chart of another method for controlling DC V2V discharge provided in an embodiment of the present application is shown;

[0020] Figure 5 A schematic flow chart of a method for controlling direct current V2V discharge provided in an embodiment of the present application is shown;

[0021] Figure 6 A schematic diagram showing an equivalent charging circuit structure of a motor controller supporting capacitor provided by an embodiment of the present application is shown;

[0022] Figure 7 A schematic flow chart of another method for controlling DC V2V discharge provided in an embodiment of the present application is shown;

[0023] Figure 8 A schematic structural diagram of an exemplary discharge network provided in an embodiment of the present application is shown;

[0024] Figure 9 A schematic flow chart of another method for controlling DC V2V discharge provided in an embodiment of the present application is shown;

[0025] Figure 10 A structural block diagram of an electronic device in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0026] The present application will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the relevant invention and are not intended to limit the invention. It should also be noted that, for ease of description, only portions relevant to the invention are shown in the accompanying drawings.

[0027] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0028] In the new energy field, extended-range hybrid vehicles can use two energy sources: fuel and batteries such as lithium batteries. The vehicles have strong applicability, which not only solves users' anxiety about pure electric mileage, but also reduces pollutant emissions and improves energy utilization, thus being widely used in the new energy industry.

[0029] Vehicle-to-Vehicle (V2V) discharge technology, which is a technology that can use vehicles with external discharge capabilities to provide charging services for other electric vehicles, has become one of the research directions of extended-range hybrid vehicles due to its practicality.

[0030] In the DC V2V discharge technology of extended-range hybrid vehicles, as mentioned in the background technology, there are problems in the prior art. This application proposes a control method and device for DC V2V discharge. By controlling the capacitor voltage of the original capacitor in the transmission circuit and using the range extender of the discharging vehicle to discharge the charger, the voltage of the discharging vehicle and the charging vehicle can be aligned in real time without adding a new circuit structure, thereby reducing the cost of DC V2V discharge.

[0031] To facilitate understanding of the embodiments of the present application, the following section first describes the DC V2V discharge system before introducing the technical solution of the present application.

[0032] Figure 1 FIG. 1 shows a schematic diagram of an exemplary DC V2V discharge system provided in an embodiment of the present application. Figure 1 As shown, the DC V2V discharging system may include a discharging vehicle 10 , a charging vehicle 20 , and a DC V2V conductive connection component.

[0033] The discharging vehicle 10 may include a discharging control pilot circuit 11 , an on-vehicle charging and discharging device 12 , and a first vehicle socket 13 .

[0034] The charging vehicle 20 may include a charging control pilot circuit 21 and a second vehicle socket 22 .

[0035] The DC V2V conductive connection assembly may include a first vehicle plug 31, a cable 32, a second vehicle plug 33, and a fuse 34. The first vehicle plug 31 can be plugged into the first vehicle socket 13, and the second vehicle plug 33 can be plugged into the second vehicle socket 22. For example, the first vehicle plug 31 can be a discharge plug, and the second vehicle plug 33 can be a charging plug. For example, the fuse 34 can be located in the first vehicle plug 31.

[0036] Specifically, the discharging vehicle 10 and the charging vehicle 20 can be charged by connecting the DC V2V conductive connection component. Optionally, since the discharging vehicle 10 is active and the charging vehicle 20 is passive, the main control of the DC V2V discharge can be completed by the discharging vehicle 10.

[0037] Furthermore, the communication between the discharging vehicle 10 and the charging vehicle 20 can meet the requirements of a preset standard communication protocol. Optionally, the preset standard communication protocol can be the communication protocol between the electric vehicle's off-board conductive charger and the battery management system. It should be noted that the preset standard communication protocol can also be other communication protocols applicable to DC V2V discharge technology, such as national standards, Japanese standards, European standards, etc., and there is no specific limitation on this.

[0038] After introducing the DC V2V discharge system, the high-voltage electrical circuit of the discharge vehicle is explained.

[0039] Figure 2 A schematic structural diagram of an exemplary power transmission circuit (or high-voltage electrical circuit) provided in an embodiment of the present application is shown.

[0040] like Figure 2 As shown, the power transmission circuit related to the discharging vehicle and DC V2V discharging may include a battery power supply circuit 14, a high-voltage accessory (HVA) 15, a range extender 16, a rear motor controller (MCUR) 17, a high-voltage distribution box (Power Distribution Unit, PDU) 18, and a charging and discharging socket DC1.

[0041] Among them, the battery power supply circuit 14 may include a power battery BAT, a fuse F1, a pre-charge resistor Rp, a pre-charge contactor Kf, a main positive contactor Kp, and a main negative contactor Kn. Specifically, when the high voltage is powered on, the main negative contactor Kn is closed first, and then the pre-charge contactor Kf is closed to charge the support capacitor. The charging current of the support capacitor is limited by the pre-charge resistor Rp to prevent the capacitor from being instantly short-circuited by directly closing the main positive contactor Kp. When the support capacitor voltage is pre-charged to a value close to the battery voltage, the main positive contactor Kp is closed and the pre-charge contactor Kf is disconnected, and the high voltage power-on is completed. And, when the high voltage is powered off, when the high voltage loads are all shut down and the high voltage bus current is less than 5A, the main negative contactor Kn is disconnected and then the main positive contactor Kp is disconnected, and the high voltage power-off is completed.

[0042] Among them, HVA15 is a high-voltage accessory that can include a positive temperature coefficient (PTC) heater, a air conditioning compressor (CCU), and a direct current-direct current converter (DCDC).

[0043] The range extender 16 may include: an engine (ENG) 161, a generator (GA) 162, and a generator control unit (GCU) 163. And, when the discharge vehicle 10 is a four-wheel drive vehicle, the range extender 16 may also include a front motor controller (MCUF). Alternatively, the front motor controller may also be provided in a front-wheel drive three-in-one, and there is no specific limitation on this. Specifically, ENG161 converts chemical energy into mechanical energy. GA 162 is coaxially connected to ENG 161, and converts the kinetic energy transmitted by ENG 161 into three-phase AC power. GCU163 converts the three-phase AC power into high-voltage DC power through a three-phase rectifier circuit and connects it in parallel with the battery circuit.

[0044] PDU18 may include a DC fast charging positive contactor K5 and a DC fast charging negative contactor K6. The DC fast charging positive contactor K5 is set on the positive transmission line, and the DC fast charging negative contactor K6 is set on the negative transmission line.

[0045] as well as, Figure 2 Also shown is a DC V2V conductive connection assembly 30 connected to the power transmission circuit. Figure 2 The DC V2V conductive connection component 30 may include: a discharge plug DC2 (corresponding to Figure 1 The first vehicle plug 31 in the vehicle), a charging plug DC3 for connecting to a charging vehicle (corresponding to Figure 1 The second vehicle plug 33 in the fuse F2 (corresponding to Figure 1 Fuse 34 in).

[0046] After introducing the above-mentioned related technologies, the technical solutions provided by the embodiments of the present application will be described below.

[0047] An embodiment of the present application provides a method for controlling DC V2V discharge, which can be executed by a discharging vehicle. Figure 3 A flow chart of a control method for DC V2V discharge in an embodiment of the present application is shown. Figure 3 As shown, the control method of DC V2V discharge provided in the embodiment of the present application includes the following steps S310 to S340.

[0048] S310 , obtaining a current battery voltage of the charging vehicle when a DC V2V conductive connection component is connected between the charging vehicle and the discharging vehicle.

[0049] A discharge vehicle is a vehicle that has an off-board electrical energy output function. In this application, a discharge vehicle can be considered a mobile energy storage power source. The power transmission circuit of the discharge vehicle can be found in the relevant description of the above-mentioned embodiments of this application, and will not be repeated here.

[0050] The charging vehicle can be a vehicle equipped with an energy storage battery. For example, the charging vehicle can be a pure electric vehicle, an extended-range electric vehicle, or a hybrid vehicle, without specific limitation. The power transmission circuitry of the charging vehicle is similar to that of the discharging vehicle. For details, please refer to the relevant description in the above sections of the embodiments of this application and will not be repeated here.

[0051] In some embodiments, S310 may include obtaining the current battery voltage of the charging vehicle during the message exchange between the discharging vehicle and the charging vehicle. For example, the charging parameters of the charging vehicle may be obtained during the message exchange between the discharging vehicle and the charging pile. The charging parameters may include the current battery voltage of the charging vehicle.

[0052] It should be noted that the discharging vehicle can also obtain the current battery voltage of the charging vehicle through other methods, and there is no specific restriction on this.

[0053] S320: Adjust the output voltage of the discharging vehicle to a target voltage range by controlling the capacitor voltage of the original capacitor in the power transmission circuit, wherein the target voltage range includes the current battery voltage.

[0054] In this embodiment of the present application, the output voltage of the discharging vehicle is the voltage difference between the positive and negative transmission lines. Furthermore, it can be assumed that one end of the original capacitor in the transmission circuit is connected to the positive transmission line, and the other end of the original capacitor is connected to the negative transmission line. Accordingly, the output voltage of the discharging vehicle can be considered equal to the capacitance voltage of the original capacitor.

[0055] The original capacitor may be an original capacitor device or an equivalent capacitor in the power transmission circuit. For example, the original capacitor may include an equivalent capacitor of a motor controller or a capacitor of a generator controller.

[0056] The target voltage range can be a range within which the difference between the output voltage of the discharging vehicle and the current battery voltage of the charging vehicle is less than a preset voltage difference threshold. For example, the lower limit of the target voltage range is equal to the difference between the current battery voltage of the charging vehicle and the preset voltage difference threshold. The upper limit of the target voltage range is equal to the sum of the current battery voltage of the charging vehicle and the preset voltage difference threshold. For example, if the current battery voltage of the charging vehicle is 300V and the preset voltage difference threshold is 10V, the target voltage range can be [290V, 310V].

[0057] The preset voltage differential threshold can be a safety value that ensures that the charging vehicle's connection to the discharging vehicle's power transmission circuit does not cause overvoltage shocks to the contactor and high-voltage system. This value can be set based on actual conditions and specific requirements, and is not subject to specific restrictions. Accordingly, in S320, by adjusting the discharging vehicle's output voltage to the target voltage range, this ensures that the charging vehicle's connection to the discharging vehicle's power transmission circuit does not cause overvoltage shocks to the contactor and high-voltage system, thereby ensuring the safety of the DC V2V discharge process.

[0058] S330 , when the battery is disconnected from the power transmission circuit, controlling the power transmission circuit of the discharge vehicle and the power transmission circuit of the charge vehicle after voltage adjustment to be connected.

[0059] In the embodiment of the present application, the fast charging contactor can be controlled to connect the power transmission circuit of the discharging vehicle with the power transmission circuit of the charging vehicle after voltage adjustment.

[0060] In some embodiments, S330 may include: controlling the fast charge contactor to close through the battery management system (BMS) to control the power transmission circuit of the discharge vehicle after voltage adjustment to be connected to the power transmission circuit of the charging vehicle. Figure 2 The DC fast charging positive contactor K5 and the DC fast charging negative contactor K6 shown are turned on.

[0061] Optionally, in order to ensure effective conduction of the power transmission circuit, the fast charging contactor in the charging vehicle can be controlled to close in advance.

[0062] In some embodiments, the battery can be disconnected from the power transmission circuit by disconnecting the pre-charge contactor Kf, the main positive contactor Kp, and the main negative contactor Kn.

[0063] S340 , when the power transmission circuit of the discharging vehicle is connected to the power transmission circuit of the charging vehicle, the charging vehicle is discharged using the range extender.

[0064] In an embodiment of the present application, the range extender can be controlled to operate in normal power generation mode, thereby providing electrical energy to the charging vehicle through the range extender's power generation. Optionally, to ensure V2V discharge safety, the range extender can adjust the discharge vehicle's output voltage in real time during the discharge process to ensure that the discharger's output voltage is consistent with the charging vehicle's real-time battery voltage. For example, the range extender can control the difference between the discharge vehicle's real-time output voltage and the charging vehicle's real-time battery voltage to be less than a preset voltage difference threshold.

[0065] In some embodiments, during the discharge process, the range extender can be started to be in normal power generation mode, and the voltage and current demand parameters of the charging vehicle can be received through the battery management system of the discharging vehicle, and the vehicle control unit (VCU) of the discharging vehicle can adjust the GCU working mode and power according to the voltage and current demand parameters forwarded by the BMS.

[0066] In some embodiments, after the charging vehicle is discharged using the range extender, the discharging vehicle may also enable high-voltage accessories to operate to ensure that the discharging vehicle meets basic usage requirements.

[0067] The technical solution provided by the embodiments of this application can adjust the output voltage of the discharging vehicle to a target voltage range by controlling the capacitance voltage of the existing capacitors in the transmission circuit. This allows the discharging vehicle and the charging vehicle to achieve voltage alignment before the transmission circuit is connected. Furthermore, during the subsequent discharge process, the range extender can discharge the charging vehicle to align the voltages of the discharging vehicle and the charging vehicle in real time. This eliminates the need for additional circuitry to achieve voltage alignment during DC V2V discharge, reducing the cost of DC V2V discharge.

[0068] It should also be noted that the solution can be applied to extended-range electric vehicles that have been manufactured or put into use and support the DC V2V discharge protocol between charging piles and charging vehicles, thereby improving the applicability of the solution.

[0069] In some embodiments, to ensure the orderly deployment of the V2V discharge scheme, Figure 4 A flow chart of another method for controlling DC V2V discharge provided in an embodiment of the present application is shown. Figure 4 and Figure 3 The difference is that before S310, a V2V interaction process between the discharging vehicle and the charging vehicle may be included, namely the following steps S301 to S307.

[0070] S301 , a charging vehicle and a discharging vehicle are respectively connected to a DC V2V conductive connection component.

[0071] Exemplarily, the charging vehicle and the discharging vehicle can be connected separately. Specifically, the DC V2V conductive connection assembly can be connected to the discharging vehicle when the discharge plug of the DC V2V conductive connection assembly is plugged into the first vehicle socket 13 of the discharging vehicle. Furthermore, the DC V2V conductive connection assembly can be connected to the charging vehicle when the charging plug of the DC V2V conductive connection assembly is plugged into the second vehicle socket 22 of the charging vehicle.

[0072] S302 : The discharging vehicle performs DC V2V discharging mode identification, and the charging vehicle performs DC charging mode identification.

[0073] In step S303, the charging vehicle and the discharging vehicle each wake up an associated controller, respectively control their respective vehicles to be in an inoperable state, and respectively pre-charge their respective vehicles to high voltage. The associated controller may be a controller required to operate during the DC V2V discharging process, and may illustratively include a VCU, a BMS, etc.

[0074] S304: When the discharging vehicle detects that the user has clicked the V2V discharging switch, the discharging vehicle outputs an auxiliary power signal of a first voltage value. The DC V2V conductive connection component closes the electronic locks at both ends.

[0075] Exemplarily, the V2V discharge switch may be a V2V discharge soft switch provided on an in-vehicle screen device.

[0076] And, illustratively, the first voltage value may be a voltage value predefined in a preset standard protocol, such as 12V.

[0077] At step S305, the discharging vehicle simulates the charging pile and sends an interaction message to the charging vehicle according to a preset standard protocol. In response to the interaction message, the discharging vehicle and the charging vehicle exchange handshake messages according to the preset standard protocol. After the discharging vehicle and the charging vehicle exchange handshake messages, the discharging vehicle closes the fast-charging contactor to perform an insulation test and outputs a second voltage value.

[0078] For example, the preset standard protocol may be a predefined message interaction protocol between the charging pile and the charging vehicle.

[0079] For example, the second voltage value may be a smaller value between the maximum allowed total charging voltage in the handshake message and the current battery voltage of the discharging vehicle.

[0080] For example, the fast charge contactor may include Figure 2 The DC fast charging positive contactor K5 and the DC fast charging negative contactor K6 are shown.

[0081] S306: After the insulation test of the discharging vehicle is completed, the BMS disconnects the fast charging contactor (such as DC fast charging positive contactor K5 and DC fast charging negative contactor K6). The discharging vehicle and the charging vehicle exchange identification messages, and the charging vehicle sends charging parameters after the identification is passed.

[0082] It should be noted that, during the execution of S306 , the discharging vehicle may obtain the current voltage parameters of the charging vehicle.

[0083] S307: The charging vehicle closes the fast-charge contactor. The high-voltage power supply of the charging vehicle is transmitted to the charging and discharging socket DC1 of the discharging vehicle via the DC V2V conductive connection component. The charging vehicle also sends a ready status message to the discharging vehicle.

[0084] Through the above steps S301 to S307, the discharging vehicle can imitate the charging pile to interact with the charging vehicle, thereby eliminating the need for hardware improvements to the discharging vehicle and the need to formulate additional standard protocols for the discharging vehicle and the charging vehicle. This can achieve a DC V2V discharging solution for the extended-range discharging vehicle and the charging vehicle, reducing the cost and complexity of the V2V solution.

[0085] In order to fully understand the control method of DC V2V discharge provided by the embodiments of the present application, the control method of DC V2V discharge will be specifically described through three embodiments.

[0086] In the first embodiment, Figure 5 The flow chart of a control method for DC V2V discharge provided by an embodiment of the present application is shown. The embodiment of the present application is optimized based on the above embodiment, and the embodiment of the present application can be combined with various optional solutions in one or more of the above embodiments.

[0087] like Figure 5 As shown, the DC V2V discharge control method includes the following steps S510 to S560.

[0088] S510 , obtaining a current battery voltage of the charging vehicle when a DC V2V conductive connection component is connected between the charging vehicle and the discharging vehicle.

[0089] Among them, S510 is similar to S310, and the specific content of S310 can be referred to, which will not be repeated here.

[0090] S520 , discharging the motor controller support capacitor so that the capacitor voltage of the motor controller support capacitor is lower than the current battery voltage.

[0091] In some embodiments, an active discharge procedure of the motor controller may be performed to discharge the motor controller support capacitance.

[0092] In one example, S520 may include the following steps A1 to A3.

[0093] Step A1: The discharging vehicle controls the high-voltage accessories to shut down. Optionally, the high-voltage accessories can be controlled to shut down via a VCU.

[0094] Step A2: When the bus current of the power transmission circuit is less than a preset current threshold, disconnect the main positive contactor Kp and the main negative contactor Kn. For example, the preset current threshold may be 5A.

[0095] In step A3, the motor controller executes an active discharge process to reduce the capacitor voltage of the capacitor to below a preset voltage threshold within a preset time. For example, the preset time and the preset voltage threshold may be specified in a preset standard protocol, such as 3s and 60V, and there is no specific limitation on this.

[0096] It should be noted that the active discharge process may also be a specific power-off process specified by other preset standard protocols, which will not be described in detail.

[0097] Furthermore, in S520 , other methods capable of discharging the supporting capacitor of the motor controller may be adopted to implement S520 , which will not be described in detail.

[0098] S530 , charging the motor controller supporting capacitor after the voltage is reduced.

[0099] In some embodiments, a battery can be used to charge the motor controller support capacitor. For example, Figure 6 A structural schematic diagram of an equivalent charging circuit structure of a motor controller support capacitor provided in an embodiment of the present application is shown.

[0100] like Figure 6 As shown, the battery E, the motor controller support capacitor C1, and the pre-charge resistor R1 can be connected in series to form an equivalent charging circuit. Among them, the battery E can charge the motor controller support capacitor C1. Among them, the charging time t1 can satisfy the following formula (1)

[0101] t1= R1×C1×ln[(V1-V0) / (V1-Vt)] (1)

[0102] Among them, V0 is the initial voltage value of the motor controller support capacitor C1, V1 is the voltage value to which the motor controller support capacitor C1 can be finally charged and discharged, and Vt is the real-time voltage value of the motor controller support capacitor C1 at time t1.

[0103] For example, if the real-time battery voltage of the discharging vehicle is 450V, the real-time battery voltage of the charging vehicle is 300V, the preset voltage difference threshold is 10V, and the voltage of the motor controller support capacitor C1 after active discharge is 0V, then the value of V1 can be 450V, the value of Vt can be 290V (i.e., the difference between the real-time battery voltage of the electric vehicle and the preset voltage difference threshold is 0), and the value of V0 is 0V. If the capacitance value of the motor controller support capacitor C1 is 1500uf and the resistance value of the pre-charge resistor R1 is 100Ω, then substituting into the above formula (1), the charging time t1 can be calculated as 100×1500×ln[(450-0) / (450-290)]=155ms.

[0104] That is, by adopting the technical solution provided in the embodiment of the present application, the charging of the motor controller support capacitor can be completed in 155ms, thereby ensuring that the voltage of the charging vehicle and the discharging vehicle are aligned within 1 minute, thereby avoiding the message timeout caused by the failure to align the two for more than 1 minute and exiting the charging process.

[0105] Optionally, the resistance of the pre-charge resistor can be reasonably set based on the positive correlation between the pre-charge control accuracy and the resistance of the pre-charge resistor, and the positive correlation between the charging time and the resistance of the pre-charge resistor. Through this embodiment, the resistance of the pre-charge resistor can be adjusted to achieve a balance between pre-charge control accuracy and charging efficiency.

[0106] In some embodiments, to further ensure the effectiveness of pre-charging, S530 may include the following steps B1 and B2.

[0107] Step B1: determining whether the discharge duration of the motor controller supporting capacitor reaches a preset duration, wherein the preset duration is greater than a prescribed discharge duration of the motor controller supporting capacitor.

[0108] For example, the preset duration can be the sum of the specified discharge duration and the preset waiting duration. If the specified discharge duration is 3 seconds, i.e., the motor controller support capacitor voltage needs to be reduced to below 60V within 3 seconds, and the preset waiting duration is 5 seconds, then the preset duration can be set to 8 seconds. It should be noted that the preset duration can also be set to other values ​​according to actual conditions and specific needs, and there is no specific limitation on this.

[0109] Step B2: When the discharge duration reaches a preset duration, charging the motor controller supporting capacitor after the voltage is reduced.

[0110] For example, continuing with the previous example, after the motor controller actively discharges, the main negative relay Kn and the pre-charge contactor Kf can be closed by the BMS to charge the motor controller support capacitor after waiting for 5 seconds.

[0111] Through the above steps B1 and B2, the voltage of the motor controller support capacitor can be further reduced, and the passive resistor in the motor controller further consumes the residual voltage, thereby ensuring that the voltage of the support capacitor is close to 0V, so that the capacitor pre-charge voltage range is larger and the time is longer, which is more conducive to system control.

[0112] S540 : When the voltage of the motor controller support capacitor increases to within the target voltage range, the battery is controlled to be disconnected from the power transmission circuit.

[0113] In some embodiments, the voltage of the motor controller support capacitor can be monitored by the motor controller, and when the voltage difference between the monitored voltage of the motor controller support capacitor and the current battery voltage of the charging vehicle is less than a preset voltage allowable threshold, it is determined that the voltage of the motor controller support capacitor is increased to a target voltage range.

[0114] In other embodiments, the charging time t1 may be calculated according to the above formula (1), and when the charging duration reaches the charging time t1, it is determined that the voltage of the motor controller support capacitor increases to the target voltage range.

[0115] It should be noted that whether the voltage of the capacitor reaches the target voltage range can also be confirmed by other methods, and there is no specific limitation on this.

[0116] In some embodiments, the BMS can close the main negative relay Kn and the pre-charge contactor Kf to control the battery to be disconnected from the power transmission circuit.

[0117] In some embodiments, to further improve voltage alignment efficiency, S540 may include the following steps C1 to C3.

[0118] Step C1, obtaining the disconnection delay of the pre-charging contactor.

[0119] In one embodiment, the disconnection delay of the pre-charge contactor may refer to the time delay between the pre-charge relay receiving a control instruction and actually operating. For example, the disconnection delay of the pre-charge contactor may be an empirical value or a statistically calculated disconnection delay of the pre-charge relay, without specific limitation. For example, it may be 30 ms, without specific limitation.

[0120] Step C2: estimating the voltage change value of the motor controller support capacitor within the disconnection delay.

[0121] For example, the voltage change value may be estimated by a preset model or formula, which is not particularly limited.

[0122] Step C3: determining the time to issue a disconnection control instruction for the pre-charging contactor based on the voltage change value, and disconnecting the battery from the power transmission circuit by controlling the disconnection control instruction to disconnect the pre-charging contactor.

[0123] For example, the lower limit of the target voltage range can be adjusted to the current battery voltage of the charging vehicle minus the preset voltage threshold and the voltage change value. Continuing with the previous example, if the voltage change value is 5V, the lower limit of the target voltage range can be adjusted from 290V to 285V. Alternatively, the lower limit of the target voltage range can be adjusted to the current battery voltage of the charging vehicle plus the preset voltage threshold, minus the voltage change value, for example, from 310V to 305V.

[0124] It should be noted that other charging control methods based on the disconnection delay of the pre-charging relay can also be used, and there is no specific limitation on this. For example, after calculating the charging time t1 using formula (1), the value obtained by subtracting the disconnection delay from the charging time t1 can be used as the new charging time t1. And when the charging duration reaches the new charging time t1, it is determined that the voltage of the motor controller support capacitor increases to a target voltage range.

[0125] S550 , when the battery is disconnected from the power transmission circuit, the power transmission circuit of the discharge vehicle and the power transmission circuit of the charge vehicle after voltage adjustment are controlled to be connected.

[0126] Among them, S550 is similar to S330. Please refer to the specific content of S330 and will not be repeated here.

[0127] For example, it can be controlled by BMS Figure 2 The DC fast charging positive contactor K5 and the DC fast charging negative contactor K6 shown are turned on.

[0128] S560 , when the power transmission circuit of the discharging vehicle is connected to the power transmission circuit of the charging vehicle, the charging vehicle is discharged using the range extender.

[0129] Among them, S560 is similar to S340. Please refer to the specific content of S340 and will not be repeated here.

[0130] For example, the VCU can start the range extender and put it into normal power generation mode (for example, the VCU can control the GCU to speed control mode), and the discharge vehicle's BMS can receive the charging vehicle's voltage and current demand parameters. The discharge vehicle's VCU can then adjust the GCU's operating mode and power based on the voltage and current demand parameters forwarded by the BMS. In a specific example, the VCU can send a target speed to the GCU based on the voltage and current demand parameters, and send a target torque to the engine management system (EMS).

[0131] Optionally, after S560 , the process may further include enabling the high-voltage accessories of the VCU of the discharging vehicle to operate.

[0132] The technical solution provided by the embodiments of this application can adjust the output voltage of the discharging vehicle to a target voltage range by controlling the capacitor voltage of the existing capacitor in the transmission circuit. This allows the discharging vehicle and the charging vehicle to achieve voltage alignment before the transmission circuit is connected. Furthermore, during the subsequent discharge process, the range extender can discharge the charging vehicle to align the voltages of the discharging vehicle and the charging vehicle in real time. This eliminates the need for additional circuitry to achieve voltage alignment during DC V2V discharge, reducing the cost of DC V2V discharge.

[0133] Furthermore, through this embodiment, the voltage of the discharging vehicle and the charging vehicle can be aligned within the predefined voltage allowable time (1 minute), avoiding the message timeout and exiting the charging process due to the alignment time exceeding the voltage allowable time.

[0134] In the second embodiment, Figure 7 The flow chart of another DC V2V discharge control method provided by the embodiment of the present application is shown. The embodiment of the present application is optimized based on the above embodiment, and the embodiment of the present application can be combined with various optional solutions in one or more of the above embodiments.

[0135] like Figure 7 As shown, the DC V2V discharge control method includes the following steps S710 to S750.

[0136] S710 , obtaining a current battery voltage of the charging vehicle when a DC V2V conductive connection component is connected between the charging vehicle and the discharging vehicle.

[0137] Among them, S710 is similar to S310. Please refer to the specific content of S310 and will not be repeated here.

[0138] S720: Control the battery to be disconnected from the power transmission circuit, so that the equivalent capacitance and equivalent resistance of the range extender and the motor controller form a discharge network by disconnecting the battery. Optionally, to form this discharge network, the range extender can be controlled to be in an idle state without generating electricity.

[0139] In one example, Figure 8 FIG. 1 shows a schematic diagram of an exemplary discharge network structure provided by an embodiment of the present application. Figure 8 As shown, the discharge network may include an equivalent capacitor C2 of the range extender and an equivalent resistor R2 of the range extender.

[0140] For example, for a two-wheel drive extended-range electric vehicle, the range extender's equivalent capacitance C2 may be the equivalent capacitance of the GCU and the equivalent capacitance of the MCUR connected in parallel. The range extender's equivalent resistance R2 may be the equivalent resistance of the GCU and the equivalent resistance of the MCUR connected in parallel.

[0141] As another example, for a four-wheel drive extended-range electric vehicle, the range extender's equivalent capacitance C2 can be the equivalent capacitance of the GCU, the equivalent capacitance of the MCUR, and the equivalent capacitance of the MCUF connected in parallel. The range extender's equivalent resistance R2 can be the equivalent resistance of the GCU, the equivalent resistance of the MCUR, and the equivalent resistance of the MCUF connected in parallel.

[0142] In one example, S720 may include the following steps D1 to D4.

[0143] Step D1: Control the range extender to enter an idle, non-powered state. For example, the range extender can be started and controlled to enter an idle, non-powered state via the VCU. Alternatively, the idle, non-powered state can be entered by controlling the ENG to rotate at a low speed.

[0144] In step D2, after the range extender enters the idle, non-generating state, the bus current is controlled to be below a preset current threshold by shutting down the high-voltage accessories. For example, the preset current threshold can be set based on actual conditions and specific requirements, for example, it can be 5A as specified in the preset standard protocol, and this is not specifically limited.

[0145] Step D3: When the bus current is lower than the preset current threshold, the range extender is controlled to be in a torque control mode.

[0146] For example, the range extender can be put into torque control mode by controlling the GCU to shut down its internal transistors, i.e., by shutting down the GCU. The transistors may be insulated gate bipolar transistors (IGBTs). Alternatively, the GCU can be shut down by the VCU.

[0147] In step D4 , after the range extender is in the torque control mode, the battery is controlled to be disconnected from the power transmission circuit.

[0148] For example, the high voltage power-off operation can be achieved by controlling the battery high voltage power-off operation. For example, the high voltage power-off operation can be achieved by disconnecting the main positive contactor Kp and the main negative contactor Kn.

[0149] Through the above steps D1 to D4, the above discharge network can be formed by disconnecting the battery and not generating electricity by the range extender, thereby accurately adjusting the capacitor voltage of the equivalent capacitor.

[0150] S730, reducing the capacitor voltage of the equivalent capacitor by using the equivalent resistor in the discharge network.

[0151] For example, see Figure 8 , the capacitance voltage of the equivalent capacitor R2 can be consumed by the equivalent resistor R2.

[0152] For example, Table 1 shows parameters of the equivalent resistance and equivalent capacitance of the range extender.

[0153] Table 1

[0154] Serial number part Equivalent resistance Equivalent capacitance 1 GCU 110kΩ 500uf 2 MCUR 50kΩ 500uf 3 MCUF 330kΩ 600uf 4 GCU+MCUR (two-wheel drive) 34.375kΩ 1000uf 5 GCU+MCUR+MCUF(four-wheel drive) 31kΩ 1600uf

[0155] As shown in Table 1, for a two-wheel drive extended-range electric vehicle, the range extender's equivalent resistance can be 34.375 kΩ, and the equivalent capacitance can be 1000 uF. If the initial voltage of the equivalent capacitor is 450 V, the final charge / discharge voltage is 0 V, and the real-time voltage Vt of the equivalent capacitor C2 at time t1 is 300 V, then substitute this into the above formula (1).

[0156] Accordingly, the above formula (1) can be used to calculate t1 = 34.375 × 10 3 ×1000×10 -6 ×ln[(0-450) / (0-300)]=14s.

[0157] Continuing to refer to Table 1, for a two-wheel drive extended-range electric vehicle, the equivalent resistance of the range extender can be 31kΩ, and the equivalent capacitance can be 1600uf. Accordingly, it can be calculated that t1 = 31×10 3 ×1600×10 -6 ×ln[(0-450) / (0-300)]=20s.

[0158] S740 , when the capacitor voltage of the equivalent capacitor is reduced to within the target voltage range, controlling the voltage-adjusted power transmission circuit of the discharging vehicle and the power transmission circuit of the charging vehicle to be connected.

[0159] In one example, the capacitor voltage of the equivalent capacitor can be monitored, and when the capacitor voltage of the equivalent capacitor drops to within the target voltage range, the fast charging contactor is closed and turned on. For example, the BMS can be used to control Figure 2 The DC fast charging positive contactor K5 and the DC fast charging negative contactor K6 shown are turned on.

[0160] S750, discharges the charged vehicle through the range extender.

[0161] In one example, S750 may include the following step E1:

[0162] The range extender is controlled to switch from the torque control mode to the normal power generation mode, so as to discharge the charging vehicle through the range extender in the normal power generation mode.

[0163] For example, the range extender can be controlled to enter normal power generation mode by controlling the GCU to activate its internal transistors (i.e., by turning on the GCU). Alternatively, the GCU can be turned on by the VCU. The details of normal power generation mode can be found in the above description of the embodiments of this application and will not be repeated here.

[0164] Optionally, after S750 , the process may further include enabling the high-voltage accessories of the VCU of the discharge vehicle to operate.

[0165] The technical solution provided by the embodiments of this application can adjust the output voltage of the discharging vehicle to a target voltage range by controlling the capacitance voltage of the existing capacitors in the transmission circuit. This allows the discharging vehicle and the charging vehicle to achieve voltage alignment before the transmission circuit is connected. Furthermore, during the subsequent discharge process, the range extender can discharge the charging vehicle to align the voltages of the discharging vehicle and the charging vehicle in real time. This eliminates the need for additional circuitry to achieve voltage alignment during DC V2V discharge, reducing the cost of DC V2V discharge.

[0166] Furthermore, through this embodiment, the voltage of the discharging vehicle and the charging vehicle can be aligned within a predefined voltage allowable time (1 minute) by consuming the power of the equivalent capacitor through the equivalent resistance of the range extender, thereby avoiding the message timeout caused by the alignment time exceeding the voltage allowable time and exiting the charging process.

[0167] In the third embodiment, Figure 9 The flow chart of another DC V2V discharge control method provided by the embodiment of the present application is shown. The embodiment of the present application is optimized based on the above embodiment, and the embodiment of the present application can be combined with various optional solutions in one or more of the above embodiments.

[0168] like Figure 9 As shown, the DC V2V discharge control method includes the following steps S710 to S750.

[0169] S910 , when a DC V2V conductive connection component is connected between the charging vehicle and the discharging vehicle, obtain a current battery voltage of the charging vehicle.

[0170] Among them, S910 is similar to S310. Please refer to the specific content of S310 and will not be repeated here.

[0171] S920, controlling the battery to be disconnected from the power transmission circuit.

[0172] In one example, S920 may include the following steps F1 to F4.

[0173] In step F1, the range extender is started by the VCU and is controlled to enter an idle state without generating electricity. For step F1, reference can be made to the description of step D1, which will not be repeated here.

[0174] In step F2, after the range extender enters the idle state, the bus current is controlled to be lower than the preset current threshold by shutting down the high-voltage accessories. For details about step F2, refer to the description of step D2 and will not be repeated here.

[0175] Step F3: When the bus current is lower than the preset current threshold, the range extender is controlled to be in the torque control mode.

[0176] For example, the range extender can be controlled to be in torque control mode by controlling the GCU to turn off the internal transistor, that is, the GCU is turned off. In particular, step F3 can refer to the relevant description of step D3, which will not be repeated here.

[0177] In step F4 , after the range extender is in the torque control mode, the battery is controlled to be disconnected from the power transmission circuit.

[0178] For example, the GCU can be controlled to shut down first, and after the GUC is shut down, the main positive contactor Kp and the main negative contactor Kn are disconnected to achieve high voltage power-off operation.

[0179] Through the above steps F1 to F4, the battery can be disconnected safely.

[0180] S930: After the battery is disconnected, the range extender is controlled to be in a normal power generation mode.

[0181] For example, the range extender can be controlled to enter normal power generation mode by controlling the GCU to turn on the internal transistor. Alternatively, the GCU can be turned on by the VCU.

[0182] At step S940, the voltage of the capacitor of the generator controller (GCU) is adjusted to a target voltage range by the range extender in normal power generation mode. For example, the voltage of the capacitor of the generator controller (GCU) can be adjusted to the target voltage range by controlling the range extender to regulate the voltage during no-load operation.

[0183] In one example, step S940 may include step G1.

[0184] Step G1: When the voltage of the capacitor of the generator controller is greater than the upper limit of the target voltage range, the voltage of the capacitor of the generator controller is lowered by the range extender in the normal power generation mode until the voltage of the capacitor of the generator controller is within the target voltage range.

[0185] In another example, step S940 may include step G2.

[0186] Step G2: When the voltage of the capacitor of the generator controller is less than the lower limit of the target voltage range, the voltage of the capacitor of the generator controller is increased by the range extender in the normal power generation mode until the voltage of the capacitor of the generator controller is within the target voltage range.

[0187] S950, controlling the voltage-adjusted power transmission circuit of the discharging vehicle to be connected to the power transmission circuit of the charging vehicle.

[0188] For example, S950 can refer to the relevant description of the above part of the embodiment of this application, and will not be repeated here.

[0189] S960 , when the power transmission circuit of the discharging vehicle is connected to the power transmission circuit of the charging vehicle, the charging vehicle is discharged using the range extender.

[0190] For example, S960 can refer to the relevant description in the above part of the embodiment of this application, and will not be repeated here.

[0191] The technical solution provided by the embodiments of this application can adjust the output voltage of the discharging vehicle to a target voltage range by controlling the capacitance voltage of the existing capacitors in the transmission circuit. This allows the discharging vehicle and the charging vehicle to achieve voltage alignment before the transmission circuit is connected. Furthermore, during the subsequent discharge process, the range extender can discharge the charging vehicle to align the voltages of the discharging vehicle and the charging vehicle in real time. This eliminates the need for additional circuitry to achieve voltage alignment during DC V2V discharge, reducing the cost of DC V2V discharge.

[0192] Furthermore, through this embodiment, the voltage of the discharging vehicle and the charging vehicle can be aligned within the predefined voltage allowable time (1 minute), avoiding the message timeout and exiting the charging process due to the alignment time exceeding the voltage allowable time.

[0193] It should also be noted that the embodiments of the present application can be applied to scenarios where a low-voltage discharging vehicle is charging a high-voltage charging vehicle. In this scenario, after the discharging vehicle battery is disconnected, the range extender can be used to regulate the voltage to raise the discharging vehicle voltage to the charging vehicle voltage platform. This expands the scope of application of DC V2V discharge solutions.

[0194] In some embodiments of the present application, after the current battery voltage of the charging vehicle is obtained, the following steps H1 to H3 may be performed.

[0195] Step H1 , determining whether the current battery voltage of the charging vehicle is lower than the current battery voltage of the discharging vehicle.

[0196] In step H2, when the current battery voltage of the charging vehicle is greater than the current battery voltage of the discharging vehicle, the voltage of the discharging vehicle is raised to the voltage platform of the charging vehicle by the DC V2V discharge control method shown in the third embodiment.

[0197] Step H3: When the current battery voltage of the charging vehicle is lower than the current battery voltage of the discharging vehicle, a preset DC V2V discharge control method is used to reduce the voltage of the discharging vehicle to the voltage platform of the charging vehicle.

[0198] In one example, the preset DC V2V discharge control method may be the DC V2V discharge control method shown in the second embodiment above.

[0199] In another example, the preset DC V2V discharge control method may be the DC V2V discharge control method shown in the first embodiment.

[0200] In yet another embodiment, the preset DC V2V discharge control method may be the DC V2V discharge control method shown in the third embodiment.

[0201] In the embodiment of the present application, the control method for preset DC V2V discharge can be flexibly selected according to the circuit characteristics of the discharging vehicle, and there is no specific limitation on this.

[0202] Those skilled in the art will appreciate that various aspects of the present application can be implemented as systems, methods, or program products. Therefore, various aspects of the present application can be specifically implemented in the following forms: a complete hardware implementation, a complete software implementation (including firmware, microcode, etc.), or an implementation that combines hardware and software aspects, which may be collectively referred to herein as a "circuit," "module," or "system."

[0203] Refer to the following Figure 10 1000 according to this embodiment of the present application will be described. Figure 10 The electronic device 1000 shown is merely an example and should not limit the functions and scope of use of the embodiments of the present application.

[0204] like Figure 10 As shown, electronic device 1000 is implemented as a general-purpose computing device. Components of electronic device 1000 may include, but are not limited to, the aforementioned at least one processing unit 1010, the aforementioned at least one storage unit 1020, and a bus 1030 connecting various system components (including storage unit 1020 and processing unit 1010).

[0205] The storage unit stores program code, which can be executed by the processing unit 1010, so that the processing unit 1010 executes the steps described in the above "Exemplary Method" section of this specification according to various exemplary embodiments of the present application.

[0206] The storage unit 1020 may include a readable medium in the form of a volatile storage unit, such as a random access memory unit (RAM) 10201 and / or a cache memory unit 10202 , and may further include a read-only memory unit (ROM) 10203 .

[0207] The storage unit 1020 may also include a program / utility 10204 having a set (at least one) of program modules 10205, such program modules 10205 including but not limited to: an operating system, one or more application programs, other program modules, and program data, each of which or some combination may include an implementation of a network environment.

[0208] Bus 1030 may represent one or more of several types of bus structures, including a memory bus or memory controller, a peripheral bus, an accelerated graphics port, a processing unit, or a local bus using any of a variety of bus architectures.

[0209] The electronic device 1000 may also communicate with one or more external devices 1040 (e.g., a keyboard, a pointing device, a Bluetooth device, etc.), one or more devices that enable a user to interact with the electronic device 1000, and / or any device that enables the electronic device 1000 to communicate with one or more other computing devices (e.g., a router, a modem, etc.). Such communication may be performed through an input / output (I / O) interface 1050.

[0210] Furthermore, the electronic device 1000 can also communicate with one or more networks (eg, a local area network (LAN), a wide area network (WAN) and / or a public network, such as the Internet) through the network adapter 1060 .

[0211] like Figure 10 As shown, the network adapter 1060 communicates with other modules of the electronic device 1000 via the bus 1030 .

[0212] It should be understood that although not shown in the figures, other hardware and / or software modules may be used in conjunction with the electronic device 1000, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems.

[0213] Through the description of the above embodiments, it is easy for those skilled in the art to understand that the example embodiments described herein can be implemented by software or by combining software with necessary hardware. Therefore, the technical solution according to the embodiments of the present application can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.) or on a network, and includes several instructions to enable a computing device (which can be a personal computer, a server, a terminal device, or a network device, etc.) to execute the method according to the embodiments of the present application.

[0214] In an exemplary embodiment of the present application, a computer-readable storage medium is further provided, which may be a readable signal medium or a readable storage medium. The computer-readable storage medium stores a program product capable of implementing the above-mentioned method of the present application.

[0215] In some possible implementations, various aspects of the present application may also be implemented in the form of a program product, which includes program code. When the program product is run on a terminal device, the program code is used to enable the terminal device to execute the steps of various exemplary implementations of the present application described in the above "Exemplary Method" section of this specification.

[0216] More specific examples of computer-readable storage media in the present application may include, but are not limited to, an electrical connection having one or more conductors, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0217] In the present application, a computer-readable storage medium may include a data signal transmitted in baseband or as part of a carrier wave, which carries a readable program code. Such a transmitted data signal may take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof.

[0218] A readable signal medium may also be any readable medium other than a readable storage medium that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.

[0219] In some examples, program code embodied on a computer-readable storage medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.

[0220] In a specific implementation, the program code for performing the operations of the present application may be written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Java, C++, and conventional procedural programming languages ​​such as C or similar programming languages. The program code may be executed entirely on the user's computing device, partially on the user's computing device, as a standalone software package, partially on the user's computing device and partially on a remote computing device, or entirely on a remote computing device or server.

[0221] Where a remote computing device is involved, the remote computing device may be connected to the user computing device through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computing device (e.g., through the Internet using an Internet service provider).

[0222] Embodiments of the present application provide a computer program product or computer program, which includes computer instructions stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium and executes the computer instructions, causing the computer device to perform the DC V2V discharge control method provided in any of the various optional embodiments of the present application.

[0223] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and core ideas of this application. The above is only the preferred implementation method of this application. It should be pointed out that due to the limitations of textual expression, there are objectively infinite specific structures. For ordinary technicians in this technical field, without departing from the principles of the present invention, they can make several improvements, modifications or changes, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, should be regarded as the scope of protection of this application.

Claims

1. A method for controlling direct current V2V discharge, the method being applied to a discharge vehicle, wherein the transmission circuit of the discharge vehicle includes a battery and a range extender, the method comprising: In a case where a DC V2V conductive connection component is connected between the charging vehicle and the discharging vehicle, obtaining a current battery voltage of the charging vehicle; adjusting the output voltage of the discharging vehicle to a target voltage range by controlling the capacitor voltage of an existing capacitor in the power transmission circuit, wherein the target voltage range includes the current battery voltage; When the battery is disconnected from the power transmission circuit, controlling the voltage-adjusted power transmission circuit of the discharging vehicle to be connected to the power transmission circuit of the charging vehicle; discharging the charging vehicle using the range extender when the power transmission circuit of the discharging vehicle is connected to the power transmission circuit of the charging vehicle; The original capacitor includes the motor controller support capacitor, The step of adjusting the output voltage of the discharging vehicle to a target voltage range by controlling the capacitor voltage of the original capacitor in the power transmission circuit includes: discharging the motor controller support capacitor so that the capacitor voltage of the motor controller support capacitor is lower than the current battery voltage; charging the motor controller supporting capacitor after the voltage is reduced; When the voltage of the motor controller support capacitor increases to within the target voltage range, controlling the battery to be disconnected from the power transmission circuit; The original capacitance includes the equivalent capacitance of the range extender, The step of adjusting the output voltage of the discharging vehicle to a target voltage range by controlling the capacitor voltage of the original capacitor in the power transmission circuit includes: controlling the battery to be disconnected from the power transmission circuit, so that an equivalent capacitance and an equivalent resistance of the range extender form a discharge network by disconnecting the battery; reducing the capacitance voltage of the equivalent capacitor by an equivalent resistor in the discharge network; Furthermore, when the power transmission circuit of the discharging vehicle is connected to the power transmission circuit of the charging vehicle, discharging the charging vehicle by using the range extender comprises: When the capacitor voltage of the equivalent capacitor decreases to within the target voltage range, the charging vehicle is discharged through the range extender.

2. The method according to claim 1, characterized in that The step of charging the motor controller supporting capacitor after the voltage is reduced comprises: Determining whether the discharge duration of the motor controller support capacitor reaches a preset duration, wherein the preset duration is greater than a prescribed discharge duration of the motor controller support capacitor; When the discharge duration reaches a preset duration, the motor controller supporting capacitor with reduced voltage is charged.

3. The method according to claim 1, characterized in that The power transmission circuit of the discharging vehicle further includes a pre-charge contactor, The controlling the battery to be disconnected from the power transmission circuit comprises: Obtaining a disconnection delay of the pre-charge contactor; estimating a voltage change value of the motor controller supporting capacitor within the disconnection time delay; Based on the voltage change value, a time for issuing a disconnection control instruction for the pre-charging contactor is determined, and the battery is disconnected from the power transmission circuit in a manner of controlling the disconnection control instruction to disconnect the pre-charging contactor.

4. The method according to claim 1, wherein The power transmission circuit of the discharging vehicle also includes high-voltage accessories and busbars; The controlling the battery to be disconnected from the power transmission circuit comprises: controlling the range extender to enter an idle state; After the range extender enters the idle state, controlling the bus current to be lower than a preset current threshold by controlling the high-voltage accessories to shut down; When the bus current is lower than a preset current threshold, controlling the range extender to be in a torque control mode; After the range extender is in a torque control mode, the battery is controlled to be disconnected from the power transmission circuit.

5. The method according to claim 1 or 4, characterized in that The discharging the charging vehicle through the range extender includes: The range extender is controlled to switch from a torque control mode to a normal power generation mode, so as to discharge the charging vehicle through the range extender in the normal power generation mode.

6. The method according to claim 1, wherein The original capacitor includes the capacitor of the generator controller in the range extender, The step of adjusting the output voltage of the discharging vehicle to a target voltage range by controlling the capacitor voltage of the original capacitor in the power transmission circuit includes: controlling the battery to be disconnected from the power transmission circuit; After the battery is disconnected, controlling the range extender to be in a normal power generation mode; The voltage of the capacitor of the generator controller is adjusted to the target voltage range by the range extender in the normal power generation mode.

7. The method according to claim 6, characterized in that The step of adjusting the voltage of the capacitor of the generator controller to a target voltage range includes: When the voltage of the capacitor of the generator controller is greater than an upper limit of the target voltage range, lowering the voltage of the capacitor of the generator controller by the range extender in the normal power generation mode until the voltage of the capacitor of the generator controller is within the target voltage range; and / or, When the voltage of the capacitor of the generator controller is less than a lower limit value of the target voltage range, the voltage of the capacitor of the generator controller is increased by the range extender in the normal power generation mode until the voltage of the capacitor of the generator controller is within the target voltage range.

8. An electronic device, characterized in that: include: processor; as well as a memory for storing executable instructions of the processor; The processor is configured to execute the direct current V2V discharge control method according to any one of claims 1 to 7 by executing the executable instructions.

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