Discharging control method for vehicle charging system, discharging control device, and vehicle

Abstract

A discharging control method for a vehicle charging system. The vehicle charging system can be used for discharging, so as to provide power replenishment for a vehicle being charged. When the vehicle charging system acquires a discharging signal, a communication converter switches to a power supply device communication controller mode to acquire charging information of the vehicle being charged, and the vehicle being charged is charged on the basis of the charging information. Further provided are a discharging control device and a vehicle. By means of the discharging control method for a vehicle charging system, electric vehicles that have broken down halfway or are in extreme environments can be rescued.

Description

Discharge control method, discharge control device and vehicle of vehicle charging system

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on March 28, 2024, with application number 202410376911.8 and invention name "A discharge control method, discharge control device and vehicle for a vehicle charging system", the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the technical field of electric vehicles, and in particular to a discharge control method, a discharge control device, and a vehicle for a vehicle charging system. Background Art

[0003] As the number of electric vehicles increases and their use cases become more diverse, the convenience of recharging their batteries has gradually become a key focus. Currently, electric vehicles primarily recharge their batteries via DC charging stations. If the user's driving range is insufficient to reach the next charging station, or if the user encounters difficulties in extreme scenarios (such as outdoors, by river, or in a valley), the battery may be depleted and unable to continue driving, creating a need for mobile recharging. Technical issues

[0004] The present application provides a discharge control method, a discharge control device and a vehicle for a vehicle charging system to meet the needs of mobile charging. Technical Solutions

[0005] The present application provides a discharge control method for a vehicle charging system, comprising: when a discharge signal is obtained, the vehicle's communication converter switches to a power supply equipment communication controller mode to obtain charging information of a charged vehicle; when the communication converter obtains the charging information of the charged vehicle, the vehicle charging system charges the charged vehicle.

[0006] The present application also provides a discharge control device, which includes: a memory, a processor, and a computer program stored in the memory and running on the processor. When the processor executes the computer program, it implements the discharge control method of the vehicle charging system described in any one of the above.

[0007] The present application also provides a vehicle, which includes the discharge control device as described above. Beneficial effects

[0008] According to the discharge control method, discharge control device and vehicle of the vehicle charging system provided in this application, the vehicle charging system can be used to discharge to replenish the power of the charged vehicle. When the vehicle charging system obtains a discharge signal, the communication converter switches to the power supply equipment communication controller mode to obtain the charging information of the charged vehicle, and charges the charged vehicle according to the charging information. Electric vehicles that break down on the road or in extreme environments can be rescued. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] FIG1 is a flow chart of a discharge control method of a vehicle charging system according to an embodiment of the present application;

[0010] FIG2 is a structural block diagram of a vehicle charging system according to an embodiment of the present application;

[0011] FIG3 is a schematic diagram showing the connection between a host vehicle and a charged vehicle according to an embodiment of the present application;

[0012] FIG4 is a flowchart of the first phase of the vehicle charging system according to an embodiment of the present application;

[0013] FIG5 is a flowchart of the second phase of the vehicle charging system according to an embodiment of the present application;

[0014] FIG6 is a flowchart of the third phase of the vehicle charging system according to an embodiment of the present application.

[0015] FIG7 is a schematic structural diagram of a discharge control device according to an embodiment of the present application;

[0016] FIG8 is a schematic structural diagram of a vehicle according to an embodiment of the present application. Modes for Carrying Out the Invention

[0017] To make the purpose, technical solutions and effects of this application clearer and more specific, the following further describes this application in detail with reference to the accompanying drawings and examples. It should be understood that the specific examples described herein are only used to explain this application and are not intended to limit this application.

[0018] The present application provides a discharge control method for a vehicle charging system, as shown in FIG1 , comprising:

[0019] Step S110: When a discharge signal is obtained, the vehicle's communication converter switches to a power supply equipment communication controller mode to obtain charging information of the charged vehicle;

[0020] Step S120: When the communication converter obtains the charging information of the charged vehicle, the vehicle charging system charges the charged vehicle.

[0021] 2 , the vehicle charging system of the main vehicle (also known as the discharging vehicle or discharging vehicle) includes a battery manager module (BMC) 210, a communication converter module (SECC / EVCC) 220, a charging and distribution assembly module (OBC&DC&VDM) 230, a motor controller module (FMCU) 240, a battery pack 250 and a DC charging port 260. Optionally, the vehicle charging system also includes a meter 270. Optionally, the vehicle charging system also includes a power domain controller (PDC). Referring to FIG3 , the vehicle charging system of the charged vehicle (also known as the charging vehicle) includes a battery manager module (BMC), a communication converter module (EVCC), a charging and distribution assembly module (OBC&DC&VDM), a motor controller module (FMCU), a battery pack and a DC charging port. It should be noted that the communication converter module of the discharging vehicle includes at least a power supply equipment communication controller (SECC) mode and an electric vehicle communication controller (EVCC) mode, and the communication converter module of the charging vehicle includes at least an electric vehicle communication controller (EVCC) mode. The VTOV conductive connecting cable (also called a discharge gun) is used to connect the DC charging ports on the discharge vehicle and the charging vehicle to complete the physical connection between the discharge vehicle and the charging vehicle, thereby realizing communication and energy transfer between the discharge vehicle and the charging vehicle.

[0022] In one embodiment, the communication converter module of the discharging vehicle can switch between SECC mode and EVCC mode. When the host vehicle is identified as charging, the communication converter module automatically invokes the EVCC function program, converting the CCS DC charging standard content at the charging pile into specific CAN messages, interacting with the BMC via the charging subnet. When the host vehicle is identified as performing VTOV discharge, the communication converter module automatically invokes the SECC function program, beginning to interact with the EVCC of the charged vehicle as the charging pile SECC, enabling normal communication between the charging and discharging vehicles.

[0023] First, step S110 is executed. When a discharge signal is obtained, the communication converter of the vehicle switches to the power supply equipment communication controller mode to obtain charging information of the charged vehicle.

[0024] Exemplarily, obtaining the discharge signal includes: obtaining a cable connection signal and a cable resistance; when the type of the connected cable is a discharge gun and a discharge trigger signal is obtained, generating the discharge signal, wherein the type of the connected cable is determined according to the cable resistance.

[0025] In one embodiment, as shown in Figure 4, after the VTOV conductive connection cable is connected to the DC charging port, the onboard charger (OBC) in the charging and distribution assembly module detects the resistance value at the discharge end of the VTOV conductive connection cable and sends a cable connection signal and resistance value to the BMC. Upon receiving the cable connection signal, the BMC determines that the connected cable is a discharge gun based on the resistance value falling within the discharge resistance range. The discharge resistance value can be any value outside the charging gun resistance range, such as 3.3k. In other words, the discharge gun resistance range does not overlap with the charging gun resistance range. Therefore, the BMC can determine whether the cable type is a charging gun or a discharge gun based on the cable resistance value. Next, the BMC sends a signal to the OBC indicating that both the charging and discharging vehicles are connected. The BMC further receives a discharge trigger signal, which includes but is not limited to a snow switch signal lasting 5 seconds. The BMC then enters the CCS DC VTOV discharge process, sends an external discharge readiness signal and a charging port lock request to the OBC, sends a subnet interaction message to the communication converter, sends a step-down DC discharge flag to the FMCL, and sends discharge information to the meter.

[0026] It should be noted that the types of connected cables include charging guns and discharge guns. The type of connected cables is determined based on the cable resistance, including: when the cable resistance falls within a first resistance range, determining that the type of the connected cable is a discharge gun; when the cable resistance falls within a second resistance range, determining that the type of the connected cable is a charging gun; wherein the first resistance range and the second resistance range have no intersection.

[0027] In one embodiment, when the FMCL receives the step-down DC discharge flag, it enters the CCS DC VTOV discharge process and returns to the DC VTOV mode.

[0028] In one embodiment, the meter displays discharge information, including but not limited to externally discharged electrical energy.

[0029] Exemplarily, when a discharge signal is obtained, the vehicle's communication converter switches to the power supply equipment communication controller mode, including: based on the external discharge readiness signal and the cable connected signal, the vehicle's charging and distribution assembly outputs a control guidance function signal; based on the control guidance function signal and the subnet interaction message, the communication converter switches to the power supply equipment communication controller mode.

[0030] In one embodiment, as shown in FIG4 , after the on-board charger (OBC) in the charging and distribution assembly module receives the BMC's signal indicating that it is ready for external discharge and that both the charging and discharging vehicles are connected, the OBC enters the CCS DC VTOV discharge process, outputs a control pilot function (CP) signal with a duty cycle of 5% (±2%), and sends a CCS DC charging status signal.

[0031] In one embodiment, as shown in FIG4 , when the communication converter receives a CP signal with a duty cycle of 5% (±2%) and a subnet interaction message, the communication converter enters the CCS DC VTOV discharge process, jumps to the SECC mode, and acts as a charger to perform information exchange between the discharging vehicle BMC and the charging vehicle.

[0032] In one embodiment, as shown in Figure 4, when the discharge signal is obtained, the BMC also sends a charging port electric lock lock request to the OBC. When the OBC receives the lock request, it forwards the lock request to the charging vehicle to execute the action, and the charging vehicle provides feedback on the charging port electric lock status. When the BMC receives the signal that the charging port electric lock is successfully locked, it performs pre-charging and enters the configuration phase (i.e., the second phase) process. If the charging port electric lock fails to lock, the BMC enters the CCS DC VTOV exit process.

[0033] Next, step S120 is executed. When the communication converter obtains the charging information of the charged vehicle, the vehicle charging system charges the charged vehicle.

[0034] Exemplarily, when the communication converter obtains the charging information of the charged vehicle, the vehicle charging system charges the charged vehicle, including: when the charging state is pre-charging, the DC charging positive contactor and the negative contactor are attracted; when the charging state is charging completion, the DC charging positive contactor and the negative contactor are disconnected.

[0035] The charging information includes charging status information, charging current requirement, and / or charging voltage requirement. Furthermore, the charging status information includes pre-charging, charging readiness, and charging start. When the discharge status is pre-charging, the DC charging positive and negative contactors are engaged, and the vehicle's motor controller reduces the vehicle's discharge voltage.

[0036] In one embodiment, after the BMC enters the configuration phase, the SECC interacts with the charging vehicle to obtain the charging information of the vehicle being charged. The SECC parses the charging status information based on the charging information obtained from the vehicle being charged and sends different subnet control instructions (pre-charge, charge ready, charge start, etc.) to the BMC. The BMC feedbacks the discharge status based on the SECC's subnet control instructions and performs contactor action control, FMCU voltage regulation control, etc. The SECC receives the discharge status (pre-charge, discharge ready, discharge start, etc.) fed back by the BMC and makes the next status judgment. When the SECC sends a charge start signal, the BMC enters the discharge phase.

[0037] In one embodiment, as shown in Figure 5, after the BMC enters the configuration phase, the SECC sends a charging status of "pre-charging" if conditions are met. When the BMC receives the SECC pre-charging signal, the charging subnet responds with a discharge status of "pre-charging". The BMC then closes the DC charging positive and negative contactors and sends a discharge permission signal to the FMCU. After the SECC receives the BMC's pre-charging signal and interprets it as the charging vehicle's charging readiness signal, the SECC sends a charging status signal of "ready to charge" to the BMC. The FMCU reduces the vehicle's discharge voltage and then feeds back a "voltage reduction completed" signal to the BMC. After receiving the FMCU's voltage reduction completed signal and the SECC's charging readiness signal, the BMC responds with a discharge readiness signal from the SECC. After receiving the BMC's discharge readiness signal and interpreting the charging vehicle's charging start signal, the SECC sends a charging status signal of "start charging" along with the effective values ​​of the charging vehicle's required voltage and current to the BMC. After receiving the SECC's charging start signal, the BMC enters the discharge phase (i.e., the third phase) and monitors the discharge status in real time.

[0038] Exemplarily, when the communication converter obtains the charging information of the charged vehicle, the vehicle charging system charges the charged vehicle and further includes: when the charging state is charging start, the motor controller adjusts the discharge voltage of the vehicle in real time based on the charging demand current and / or the charging demand voltage.

[0039] In one embodiment, during the discharge process, the FMCU adjusts the discharge voltage of the discharging vehicle in real time based on the voltage and current requirements forwarded by the BMC to meet the voltage and current requirements of the charging vehicle. Simultaneously, the BMC and SECC forward relevant discharge status signals in real time, allowing the charging and discharging vehicles to confirm their current charge and discharge status. The BMC and SECC also monitor stop conditions in real time. When these conditions are met, the SECC and BMC immediately send a discharge stop signal, instructing the discharging and charging vehicles to enter the corresponding stop process and exit the CCS DC VTOV discharge process.

[0040] In one embodiment, as shown in Figure 6, the SECC transmits the charging vehicle's required voltage and current, including RMS values, to the BMC, and forwards the current voltage and current to the EVCC of the charged vehicle. The BMC forwards the charging vehicle's required voltage, current, and charging mode to the FMCU in real time, which then adjusts the voltage. The BMC then conducts a discharge inspection. When it detects a condition to stop charging or receives a charge end command from the SECC, it enters the discharge end process and sends relevant commands to control the FMCU and SECC to exit the discharge process. When the SECC detects that the charging vehicle meets the end conditions or the BMC sends a discharge end or discharge stop signal, it sends a charge end message, terminates the CCS DC VTOV discharge process, and signals the BMC that the charging status is either complete or stopped, stopping the charging process. When the FMCU receives the BMC stop command, it enters the discharge process and exits the discharge state after discharge is complete. Upon detecting that the FMCU discharge is complete, the BMC disconnects the corresponding contactor, sends a power unlock request, and stops sending subnet messages, completely exiting the discharge process. The OBC forwards the charging port unlock request to the charging vehicle to unlock the power lock.

[0041] Exemplarily, the discharge control method further includes the step of obtaining a stop-discharge signal and switching the communication converter to an electric vehicle communication controller mode.

[0042] In one embodiment, after SECC exits the current discharge process, it will re-judge the VTOV entry conditions. If the conditions are not met, it will enter the EVCC mode and prepare for vehicle-pile communication. If the conditions are met, it will re-enter the SECC to communicate with the discharging vehicle and the charging vehicle.

[0043] According to the discharge control method of the vehicle charging system provided in the present application, the vehicle charging system can be used to discharge to replenish the power of the charged vehicle. When the vehicle charging system obtains a discharge signal, the communication converter switches to the power supply equipment communication controller mode to obtain the charging information of the charged vehicle, and charges the charged vehicle according to the charging information. This can rescue electric vehicles that have broken down on the road or in extreme environments.

[0044] According to an embodiment of the present application, a discharge control device 300 is further provided. As shown in FIG7 , the discharge control device 300 includes a memory 310 and a processor 320 .

[0045] The memory 310 stores program codes for implementing corresponding steps in the discharge control method of the charging system of the vehicle 400 according to the embodiment of the present application.

[0046] The processor 320 is configured to run the program code stored in the memory 310 to execute corresponding steps of the discharge control method of the charging system of the vehicle 400 according to the embodiment of the present application.

[0047] In addition, according to an embodiment of the present application, a computer-readable storage medium is provided, on which program instructions are stored. When the program instructions are executed by a computer or processor 320, the computer or processor 320 is used to execute the corresponding steps of the discharge control method of the vehicle charging system 400 according to the embodiment of the present application. The computer-readable storage medium may include, for example, a storage component of a tablet computer, a hard disk of a personal computer, a read-only memory 310 (ROM), an erasable programmable read-only memory 310 (EPROM), a portable compact disk read-only memory 310 (CD-ROM), a USB memory 310, or any combination of the above storage media. The computer-readable storage medium may be any combination of one or more computer-readable storage media, for example, one computer-readable storage medium contains computer-readable program code for randomly generating a sequence of action instructions, and another computer-readable storage medium contains computer-readable program code for controlling crystal growth.

[0048] In addition, the present application also provides a vehicle 400 , as shown in FIG8 , in which the vehicle 400 is equipped with the discharge control device 300 described above.

[0049] It is understandable that those skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of this application, and all these changes or substitutions should fall within the scope of protection of the claims attached to this application.

Claims

1. A discharge control method for a vehicle charging system, wherein: include: When a discharge signal is received, the vehicle's communication converter switches to the power supply equipment communication controller mode to obtain charging information of the charged vehicle; When the communication converter obtains the charging information of the charged vehicle, the vehicle charging system charges the charged vehicle.

2. The method according to claim 1, wherein The obtaining of the discharge signal comprises: Get the cable connected signal and cable resistance; When the type of the connected cable is a discharge gun and a discharge trigger signal is obtained, generating the discharge signal; The type of the connected cable is determined according to the resistance of the cable.

3. The method according to claim 2, wherein: The discharge signal includes an external discharge readiness signal and a subnet interaction message; When the discharge signal is obtained, the vehicle's communication converter switches to the power supply equipment communication controller mode, including: Based on the external discharge readiness signal and the cable connection signal, the charging and distribution assembly of the vehicle outputs a control guidance function signal; Based on the control guidance function signal and the subnet interaction message, the communication converter switches to the power supply equipment communication controller mode.

4. The method according to claim 1, wherein The charging information includes a charging state, a charging requirement current, and a charging requirement voltage. The charging state includes pre-charging, charging readiness, charging start, or charging end.

5. The method according to claim 4, wherein: When the communication converter obtains the charging information of the charged vehicle, the vehicle charging system charges the charged vehicle, including: When the charging state is pre-charging, the DC charging positive contactor and the negative contactor are attracted; When the charging state is charging completion, the DC charging positive contactor and the negative contactor are disconnected.

6. The method of claim 4, wherein: When the communication converter obtains the charging information of the charged vehicle, the vehicle charging system charges the charged vehicle, including: When the charging state is pre-charging, the motor controller of the vehicle reduces the discharge voltage of the vehicle; When the charging state is charging start, the motor controller adjusts the discharge voltage of the vehicle in real time based on the required charging current and / or the required charging voltage.

7. The method of claim 4, wherein: When the communication converter obtains the charging information of the charged vehicle, the vehicle charging system charges the charged vehicle, including: When the charging state is charging completion, the communication converter switches from the power supply equipment communication controller mode to the vehicle communication controller mode.

8. The method of claim 4, wherein: Also includes: When the discharge signal is obtained, the charging port is electrically locked; When the charging state is charging completed, the charging port electric lock is unlocked.

9. The method of claim 2, wherein: The type of the connected cable includes a charging gun and a discharging gun. The type of the connected cable is determined according to the resistance of the cable, including: When the cable resistance falls within the first resistance range, determining that the type of the connected cable is the discharge gun; When the cable resistance falls within the second resistance range, determining that the type of the connected cable is the charging gun; The first resistance range and the second resistance range have no intersection.

10. The method of claim 9, wherein: The discharge signal includes an external discharge readiness signal and a subnet interaction message; When the discharge signal is obtained, the vehicle's communication converter switches to the power supply equipment communication controller mode, including: Based on the external discharge readiness signal and the cable connection signal, the charging and distribution assembly of the vehicle outputs a control guidance function signal; Based on the control guidance function signal and the subnet interaction message, the communication converter switches to the power supply equipment communication controller mode.

11. The method of claim 9, wherein: The charging information includes a charging state, a charging requirement current, and a charging requirement voltage. The charging state includes pre-charging, charging readiness, charging start, or charging end.

12. The method of claim 11, wherein: When the communication converter obtains the charging information of the charged vehicle, the vehicle charging system charges the charged vehicle, including: When the charging state is pre-charging, the DC charging positive contactor and the negative contactor are attracted; When the charging state is charging completion, the DC charging positive contactor and the negative contactor are disconnected.

13. The method of claim 11, wherein: When the communication converter obtains the charging information of the charged vehicle, the vehicle charging system charges the charged vehicle, including: When the charging state is pre-charging, the motor controller of the vehicle reduces the discharge voltage of the vehicle; When the charging state is charging start, the motor controller adjusts the discharge voltage of the vehicle in real time based on the required charging current and / or the required charging voltage.

14. The method of claim 11, wherein: When the communication converter obtains the charging information of the charged vehicle, the vehicle charging system charges the charged vehicle, including: When the charging state is charging completion, the communication converter switches from the power supply equipment communication controller mode to the vehicle communication controller mode.

15. The method of claim 11, wherein: Also includes: When the discharge signal is obtained, the charging port is electrically locked; When the charging state is charging completed, the charging port electric lock is unlocked.

16. The method of claim 1, wherein: Also includes: Obtaining a discharge stop signal; In response to acquiring the stop-discharging signal, the communication converter switches to an electric vehicle communication controller mode.

17. The method of claim 16, wherein: The obtaining of the discharge signal comprises: Get the cable connected signal and cable resistance; When the type of the connected cable is a discharge gun and a discharge trigger signal is obtained, generating the discharge signal; The type of the connected cable is determined according to the resistance of the cable.

18. The method of claim 17, wherein: The discharge signal includes an external discharge readiness signal and a subnet interaction message; When the discharge signal is obtained, the vehicle's communication converter switches to the power supply equipment communication controller mode, including: Based on the external discharge readiness signal and the cable connection signal, the charging and distribution assembly of the vehicle outputs a control guidance function signal; Based on the control guidance function signal and the subnet interaction message, the communication converter switches to the power supply equipment communication controller mode.

19. A discharge control device, wherein: include: A memory, a processor, and a computer program stored in the memory and running on the processor, wherein when the processor executes the computer program, the discharge control method of the vehicle charging system according to any one of claims 1 to 18 is implemented.

20. A vehicle, wherein The vehicle includes the discharge control device according to claim 19.

Images