Charge and discharge steering circuit and control method thereof

Abstract

The present application relates to the field of power control technology and provides a charge and discharge steering circuit and a control method thereof. The steering circuit includes a first steering circuit and a second steering circuit; the first steering circuit includes a multidirectional switch, a first resistor, a second resistor, and a first control module for controlling a bidirectional charging device; the second steering circuit includes a second control module for controlling a target vehicle; the first control module is configured to respond to a control instruction and control the multidirectional switch to switch to a corresponding fixed contact to output a resistance signal corresponding to the control instruction to the second control module; the second control module is configured to switch the current operating mode of the target vehicle based on the resistance signal and adjust the pulse signal output to the first control module based on the switched current operating mode; the first control module is further configured to control the bidirectional charging device to switch to a target operating mode that matches the current operating mode based on the pulse signal.

Description

Technical Field

[0001] The present application relates to the field of power control technology, and in particular to a charge and discharge steering circuit and a control method thereof. Background Art

[0002] To improve the utilization rate of electric vehicle energy storage batteries and reduce the power load on the power grid, electric vehicles equipped with bidirectional onboard chargers are typically connected to bidirectional charging devices with charging and discharging functions, such as bidirectional charging piles, to achieve vehicle charging and discharging. Bidirectional charging devices have charging and discharging modes. The charging mode converts the AC power from the power grid into DC power that can be accepted by the electric vehicle's battery or energy storage battery, while the discharging mode converts the electric vehicle's battery or energy storage battery into AC power for the power grid.

[0003] However, in existing technologies, after a vehicle is connected to a bidirectional charging device, it may not discharge. This inability may be caused by a mismatch between the operating modes of the vehicle and the bidirectional charging device, preventing the vehicle from being charged or discharged through the bidirectional charging device. Therefore, how to adapt the operating modes of the vehicle and the bidirectional charging device so that the vehicle can be charged and discharged through the bidirectional charging device is an urgent problem that needs to be solved. Summary of the Invention

[0004] This application aims to solve at least one of the technical problems existing in the related art. To this end, this application proposes a charge and discharge guidance circuit that can adapt to the working mode between the vehicle and the bidirectional charging device so that the vehicle can discharge normally through the bidirectional charging device.

[0005] According to an embodiment of the first aspect of the present application, a charge and discharge steering circuit includes a first steering circuit provided in a bidirectional charging device and a second steering circuit provided in a target vehicle, wherein the bidirectional charging device is connected to the target vehicle to connect the first steering circuit and the second steering circuit;

[0006] The first steering circuit includes a multi-directional switch, a first resistor, a second resistor, and a first control module for controlling the bidirectional charging device, and the second steering circuit includes a second control module for controlling the target vehicle;

[0007] The common contact of the multidirectional switch is grounded, the first fixed contact of the multidirectional switch is connected to the first end of the first resistor, the second fixed contact of the multidirectional switch is connected to the first end of the second resistor, the second end of the first resistor and the second end of the second resistor are connected to the first input end of the second control module, and the first resistor and the second resistor have different resistance values;

[0008] The first control module is used to respond to a control instruction and control the multi-directional switch to switch to a corresponding fixed contact, so as to output a resistance signal corresponding to the control instruction to the second control module;

[0009] The second control module is used to switch the current working mode of the target vehicle according to the resistance signal, and adjust the pulse signal output to the first control module according to the current working mode after switching;

[0010] The first control module is further configured to control the bidirectional charging device to switch to a target operating mode matching the current operating mode according to the pulse signal;

[0011] The control instruction includes a vehicle charging instruction or a vehicle discharging instruction, and the current working mode and the target working mode both include a charging mode or a discharging mode.

[0012] According to one embodiment of the present application, the first control module is specifically configured to:

[0013] In response to a control instruction, the multi-directional switch is controlled to be disconnected;

[0014] When it is determined that the disconnection time of the multidirectional switch reaches a preset time, the switch is switched to a fixed contact corresponding to the control instruction to output a resistance signal corresponding to the control instruction to the second control module.

[0015] According to one embodiment of the present application, the first steering circuit further includes a first single-pole double-throw switch and a first voltage divider element, and the second steering circuit further includes a second single-pole double-throw switch;

[0016] A fixed contact of the first single-pole double-throw switch is connected to the first detection terminal of the first control module and one end of the first voltage dividing element, and the other end of the first voltage dividing element is grounded;

[0017] The common contact of the second single-pole double-throw switch is connected to the common contact of the first single-pole double-throw switch, and a fixed contact of the second single-pole double-throw switch is connected to the second input terminal of the second control module and the signal output terminal of the second control module;

[0018] The first control module is further configured to switch the first single-pole double-throw switch to a fixed contact connected to the first detection terminal of the first control module in response to a vehicle discharge instruction;

[0019] The second control module is used to switch the second single-pole double-throw switch to a fixed contact connected to the second input terminal of the second control module according to the resistance signal corresponding to the discharge instruction of the target vehicle, and control the signal output terminal of the second control module to output a first target voltage, and then detect the voltage signal of the second input terminal, so as to switch the current operating mode of the target vehicle to the discharge mode when it is determined that the voltage signal detected at the second input terminal is less than a first preset value of the first target voltage, and control the signal output terminal to output a pulse signal corresponding to the current discharge parameter according to the current discharge parameter of the target vehicle.

[0020] According to one embodiment of the present application, the first voltage dividing element includes a first switch, a first voltage dividing resistor and a second voltage dividing resistor;

[0021] The first switch is grounded, the other end of the first switch is connected to one end of the first voltage-dividing resistor, one end of the second voltage-dividing resistor is grounded, and the other ends of the first voltage-dividing resistor and the second voltage-dividing resistor are connected to a fixed contact of a first single-pole double-throw switch;

[0022] The first control module is further configured to respond to a pulse signal corresponding to the current discharge parameter received by the first detection end, control the first switch to close, and control the bidirectional charging device to switch to a discharge mode when it is determined that the voltage detected by the first detection end is reduced.

[0023] According to one embodiment of the present application, the first control module is further configured to, when determining that the pulse signal is abnormal, disconnect the first switch;

[0024] The second control module is further configured to determine that the first switch is disconnected and control the target vehicle to exit the discharge mode.

[0025] According to one embodiment of the present application, the other fixed contact of the first single-pole double-throw switch is connected to the second detection terminal of the first control module and the output terminal of the first control module;

[0026] The second steering circuit further includes a second voltage divider element, one end of the second voltage divider element is grounded, the other end of the second voltage divider element is connected to another fixed contact of the second single-pole double-throw switch, and the other fixed contact of the second single-pole double-throw switch is connected to the third input terminal of the second control module;

[0027] The first control module is further configured to switch the first single-pole double-throw switch to a fixed contact connected to the second detection terminal of the first control module in response to a vehicle charging instruction;

[0028] The second control module is configured to control the current operating mode of the target vehicle to switch to the charging mode according to the resistance signal corresponding to the charging instruction of the target vehicle, and then switch the second single-pole double-throw switch to a fixed contact connected to the third input terminal of the second control module to adjust the pulse signal output to the first control module;

[0029] The first control module is used to determine whether the voltage of the pulse signal is less than a preset voltage, control the output end of the first control module to output a second target voltage, and then detect the voltage signal received by the second detection end, so as to switch the bidirectional charging device to a charging mode when it is determined that the voltage signal received by the second detection end is a second preset value less than the second target voltage.

[0030] According to one embodiment of the present application, the second voltage dividing element includes a second switch, a third voltage dividing resistor and a fourth voltage dividing resistor;

[0031] The second switch is grounded, the other end of the second switch is connected to one end of the third voltage-dividing resistor, one end of the fourth voltage-dividing resistor is grounded, and the other ends of the third and fourth voltage-dividing resistors are connected to another fixed contact of the second single-pole double-throw switch;

[0032] The second control module is further configured to determine that the voltage signal received by the third input terminal is a third preset value that is less than the second target voltage, and control the second switch to be closed.

[0033] According to one embodiment of the present application, the second control module is further configured to, when determining that the target vehicle is abnormally charged, disconnect the second switch;

[0034] The first control module is further configured to determine that the second switch is disconnected, and control the bidirectional charging device to exit a charging mode.

[0035] A control method for a charge and discharge steering circuit according to an embodiment of the second aspect of the present application is applied to the first control module as described in any of the above embodiments, including:

[0036] In response to a control instruction, controlling the multidirectional switch to switch to a corresponding fixed contact, so as to output a resistance signal corresponding to the control instruction to the second control module;

[0037] receiving a pulse signal fed back by the second control module according to the resistance signal, and controlling the bidirectional charging device to switch to a target operating mode matching the current operating mode according to the pulse signal;

[0038] The second control module switches the current working mode of the target vehicle according to the resistance signal, and adjusts the pulse signal output to the first control module according to the switched current working mode;

[0039] The control instruction includes a vehicle charging instruction or a vehicle discharging instruction, and the current working mode and the target working mode both include a charging mode or a discharging mode.

[0040] A control method for a charge and discharge steering circuit according to an embodiment of the third aspect of the present application is applied to the second control module as described in any of the above embodiments, including:

[0041] controlling the bidirectional charging device to switch to a target operating mode matching the current operating mode according to the received resistance signal;

[0042] adjusting the pulse signal output to the first control module according to the current operating mode after switching, so that the first control module controls the bidirectional charging device to switch to a target operating mode matching the current operating mode according to the pulse signal;

[0043] The resistance signal is generated by the first control module responding to a control instruction to control the multi-directional switch to switch to a corresponding fixed contact;

[0044] The control instruction includes a vehicle charging instruction or a vehicle discharging instruction, and the current working mode and the target working mode both include a charging mode or a discharging mode.

[0045] The above one or more technical solutions in the embodiments of the present application have at least one of the following technical effects:

[0046] A charge and discharge pilot circuit is provided. A first control module controls the resistance switching of a first pilot circuit in a bidirectional charging device, prompting a second pilot circuit in a target vehicle to indicate the working mode the bidirectional charging device is about to enter. The second control module controls the target vehicle to enter the corresponding working mode and then adjusts the pulse signal. This enables the first control module to control the bidirectional charging device to enter the corresponding working mode based on the pulse signal, thereby adapting the working modes of the vehicle and the bidirectional charging device and enabling normal discharge through the bidirectional charging device. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the technical solutions in the present application or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0048] Figure 1 This is a first structural diagram of the charge and discharge steering circuit provided in an embodiment of the present application;

[0049] Figure 2 This is a second structural diagram of the charge and discharge steering circuit provided in an embodiment of the present application;

[0050] Figure 3 3 is a schematic diagram of the third structure of the charge and discharge steering circuit provided in an embodiment of the present application;

[0051] Figure 4 This is a first flow chart of a method for controlling a charge and discharge steering circuit according to an embodiment of the present application;

[0052] Figure 5 This is a second flow chart of the control method of the charge and discharge steering circuit provided in an embodiment of the present application;

[0053] Figure 6 This is a first structural diagram of a control device for a charge and discharge steering circuit provided in an embodiment of the present application;

[0054] Figure 7 This is a second structural diagram of the control device of the charge and discharge steering circuit provided in an embodiment of the present application;

[0055] Figure 8 It is a structural diagram of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0056] To make the objectives, technical solutions, and advantages of this application more clear, the technical solutions in this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.

[0057] To improve the utilization rate of electric vehicle energy storage batteries and reduce the power load on the power grid, electric vehicles equipped with bidirectional onboard chargers are typically connected to bidirectional charging devices with charging and discharging functions, such as bidirectional charging piles, to achieve vehicle charging and discharging. Bidirectional charging devices have charging and discharging modes. The charging mode converts the AC power from the power grid into DC power that can be accepted by the electric vehicle's battery or energy storage battery, while the discharging mode converts the electric vehicle's battery or energy storage battery into AC power for the power grid.

[0058] However, in existing technologies, after a vehicle is connected to a bidirectional charging device, it may not be able to discharge. This inability may be caused by a mismatch between the operating modes of the vehicle and the bidirectional charging device, preventing the vehicle from being charged or discharged through the bidirectional charging device. For example, if the vehicle is in discharge mode while the bidirectional charging device is in charge mode, the vehicle cannot be discharged through the bidirectional charging device. Therefore, how to adapt the operating modes of the vehicle and the bidirectional charging device so that the vehicle can be charged and discharged through the bidirectional charging device is an urgent problem that needs to be solved.

[0059] In order to solve the above problems, the present invention provides a charge and discharge guidance circuit. Figure 1 As shown, the charge and discharge steering circuit includes a first steering circuit provided in a bidirectional charging device 10 and a second steering circuit provided in a target vehicle 20. The bidirectional charging device 10 is connected to the target vehicle 20 to connect the first steering circuit and the second steering circuit. The first steering circuit includes a multidirectional switch K, a first resistor Rc1, a second resistor Rc2, and a first control module 101 for controlling the bidirectional charging device 10. The second steering circuit includes a second control module 102 for controlling the target vehicle 20. The common contact of the multidirectional switch K is grounded. The first fixed contact of the multidirectional switch K is connected to the first end of the first resistor Rc1. The second fixed contact of the multidirectional switch K is connected to the first end of the second resistor Rc2. The second end of the first resistor Rc1 and the second end of the second resistor Rc2 are connected to the first input terminal A1 of the second control module 102. The first resistor Rc1 and the second resistor Rc2 have different resistance values.

[0060] The first control module 101 is used to respond to a control instruction and control the multi-directional switch K to switch to the corresponding fixed contact, so as to output a resistance signal corresponding to the control instruction to the second control module 102; the second control module 102 is used to switch the current operating mode of the target vehicle 20 according to the resistance signal, and adjust the pulse signal output to the first control module 101 according to the switched current operating mode; the first control module 101 is also used to control the bidirectional charging device 10 to switch to a target operating mode matching the current operating mode according to the pulse signal; wherein the control instruction includes a vehicle charging instruction or a vehicle discharging instruction, and the current operating mode and the target operating mode both include a charging mode or a discharging mode.

[0061] In some embodiments, the bidirectional charging device 10 can be an AC charging / discharging station connected to the power grid, and the target vehicle 20 can be an electric vehicle equipped with a bidirectional onboard charger capable of charging or discharging. The bidirectional charging device 10 is provided with a first pilot circuit, and the target vehicle 20 is provided with a second pilot circuit. The bidirectional charging device 10 and the target vehicle 20 are connected via a plug and socket, connecting the first pilot circuit to the second pilot circuit.

[0062] The multidirectional switch K in the first pilot circuit may be a single-pole multi-throw switch having multiple fixed contacts and one common contact, such as a single-pole double-throw switch having two fixed contacts and one common contact. The common contact of the multidirectional switch K may be grounded through a current limiting unit, such as the current limiting unit may include a current limiting resistor Rb and a relay Kb. The common contact of the multidirectional switch K is connected to one end of the relay Kb, the other end of the relay Kb is grounded, and the current limiting resistor Rb is connected to both ends of the relay Kb.

[0063] One end of the first resistor Rc1 is connected to the first fixed contact of the multi-directional switch K, one end of the second resistor Rc2 is connected to the second fixed contact of the multi-directional switch K, and the other ends of the first resistor Rc1 and the second resistor Rc2 are connected to the first input terminal A1 of the second control module 102. Since the first resistor Rc1 and the second resistor Rc2 have different resistance values, the first input terminal A1 of the second control module 102 will detect different resistance signals when the multi-directional switch K is switched to different fixed contacts.

[0064] The first control module 101 may be a controller within the bidirectional charging device 10 and may be equipped with a communication module, such as a Bluetooth or Wi-Fi wireless communication module, to receive user input of vehicle charging or discharging instructions via the communication module, or to transmit grid parameters of the power grid, such as the frequency, phase, and phase angle of the AC grid, to the target vehicle 20 via the communication module. The second control module 102 may be an onboard controller of the target vehicle 20, such as a battery management system or vehicle controller carried by the target vehicle 20, and may be used to detect battery parameters of the target vehicle 20's battery and control charging and discharging of the target vehicle 20. For example, the second control module 102 may be connected to the target vehicle 20's bidirectional onboard charger to control charging and discharging of the target vehicle 20.

[0065] When the first control module 101 receives a control instruction, it responds to the control instruction by controlling the multidirectional switch K to switch to a fixed contact corresponding to the control instruction, thereby outputting a resistance signal corresponding to the control instruction to the second control module 102. For example, if the control instruction received by the first control module 101 is a vehicle discharge instruction instructing the vehicle to discharge, the multidirectional switch K is controlled to switch to a first fixed contact connected to the first resistor Rc1, thereby outputting a resistance signal including the resistance value of the first resistor Rc1 to the second control module 102. If the control instruction received by the first control module 101 is a vehicle charge instruction instructing the vehicle to charge, the multidirectional switch K is controlled to switch to a second fixed contact connected to the second resistor Rc2, thereby outputting a resistance signal including the resistance value of the second resistor Rc2 to the second control module 102.

[0066] In some embodiments, the signal output terminal of the second control module 102 can be connected to the detection terminal of the first control module 101, and the detection terminal can be an input terminal for the first control module 101 to receive signals. When the second control module 102 detects that the resistance signal is the resistance value of the first resistor Rc1, it can determine that the bidirectional charging device 10 is ready to enter the discharge mode. At this time, the current operating mode of the target vehicle 20 can be switched to the discharge mode, such as by switching the bidirectional onboard charger of the target vehicle 20 to the discharge mode. After switching to the discharge mode, the pulse signal output to the first control module 101 is adjusted so that the first control module 101 receives the pulse signal corresponding to the discharge mode. If the resistance signal is detected to be the resistance value of the second resistor Rc2, it can be determined that the bidirectional charging device 10 is ready to enter the charge mode. At this time, the current operating mode of the target vehicle 20 can be switched to the discharge mode, such as by switching the bidirectional onboard charger of the target vehicle 20 to the charge mode. After switching to the charge mode, the pulse signal output to the first control module 101 is adjusted so that the first control module 101 receives the pulse signal corresponding to the charge mode.

[0067] Upon receiving the corresponding pulse signal, the second control module 102 controls the bidirectional charging device 10 to switch to a target operating mode that matches the current operating mode. If the received pulse signal corresponds to the discharge mode, the bidirectional charging device 10 is controlled to switch to the discharge mode; if the received pulse signal corresponds to the charge mode, the bidirectional charging device 10 is controlled to switch to the charge mode.

[0068] An embodiment of the present application provides a charge and discharge steering circuit, which can control the resistance switching of the first steering circuit in a bidirectional charging device through a first control module, prompt the second steering circuit in a target vehicle to indicate the working mode that the bidirectional charging device is about to enter, and adjust the pulse signal after controlling the target vehicle to enter the corresponding working mode through the second control module, so that the first control module can control the bidirectional charging device to enter the corresponding working mode based on the pulse signal, thereby adapting the working modes between the vehicle and the bidirectional charging device and enabling normal discharge through the bidirectional charging device.

[0069] In some embodiments, the first control module 101 is specifically used to: respond to a control instruction to control the multi-directional switch K to disconnect; determine that the disconnection time of the multi-directional switch K reaches a preset time, and switch to a fixed contact corresponding to the control instruction to output a resistance signal corresponding to the control instruction to the second control module 102.

[0070] Exemplarily, the multidirectional switch K can be a single-pole triple-throw switch with three fixed contacts and one common contact, the first fixed contact of the multidirectional switch K is connected to the first end of the first resistor Rc1, the second fixed contact is connected to the first end of the second resistor Rc2, and the third fixed contact is unloaded or grounded.

[0071] Upon receiving a control instruction, the first control module 101 can respond to the control instruction, control the multidirectional switch K to switch to the third fixed contact to disconnect, and detect the duration of the disconnection of the multidirectional switch K. If the duration reaches a preset duration, such as 3 seconds, the multidirectional switch K is controlled to switch from the third fixed contact to the fixed contact corresponding to the control instruction. If the control instruction is a vehicle charging instruction, the multidirectional switch K is controlled to switch from the third fixed contact to the first fixed contact; if the control instruction is a vehicle discharging instruction, the multidirectional switch K is controlled to switch from the third fixed contact to the second fixed contact. In this way, by controlling the multidirectional switch K to disconnect, the action of plugging and unplugging the charging gun of the electric vehicle can be simulated, avoiding the situation where the target vehicle 20's charging and discharging mode switches too quickly due to the multidirectional switch K being switched directly from the first fixed contact to the second fixed contact, or from the second fixed contact to the first fixed contact during charging and discharging switching, thereby affecting the battery performance, thereby improving the safety of the target vehicle 20's charging and discharging mode switching.

[0072] In some embodiments, as Figure 2 As shown, the first steering circuit further includes a first single-pole double-throw switch S1 and a first voltage dividing element 201, and the second steering circuit further includes a second single-pole double-throw switch S1';

[0073] A fixed contact of the first single-pole double-throw switch S1 is connected to the first detection terminal A1' of the first control module 101 and one end of the first voltage dividing element 201, and the other end of the first voltage dividing element 201 is grounded;

[0074] The common contact of the second single-pole double-throw switch S1′ is connected to the common contact of the first single-pole double-throw switch S1, and a fixed contact of the second single-pole double-throw switch S1′ is connected to the second input terminal A2 of the second control module 102 and the signal output terminal of the second control module 102;

[0075] The first control module 101 is further configured to respond to a vehicle discharge instruction and switch the first single-pole double-throw switch S1 to a fixed contact connected to the first detection terminal A1' of the first control module 101;

[0076] The second control module 102 is used to switch the second single-pole double-throw switch S1' to a fixed contact connected to the second input terminal A2 of the second control module 102 according to the resistance signal corresponding to the discharge instruction of the target vehicle 20, and control the signal output terminal of the second control module 102 to output a first target voltage, and then detect the voltage signal of the second input terminal A2, so as to switch the current operating mode of the target vehicle 20 to the discharge mode when it is determined that the voltage signal detected at the second input terminal A2 is less than a first preset value of the first target voltage, and control the signal output terminal to output a pulse signal corresponding to the current discharge parameter according to the current discharge parameter of the target vehicle 20.

[0077] The first voltage divider element 201 may include a voltage divider resistor. The signal output terminal of the second control module 102 may include a voltage output terminal and a PWM output terminal. The voltage output terminal and the PWM output terminal of the second control module 102 may be connected to a fixed contact of a second single-pole double-throw switch S1' via a single-pole double-throw switch Sn. For example, the voltage output terminal of the second control module 102 may be a +12V voltage output terminal.

[0078] When the first control module 101 receives the vehicle discharge instruction, it can control the multidirectional switch K to connect to the first fixed contact, and simultaneously control the first single-pole double-throw switch S1 to connect to the fixed contact connected to the first detection terminal A1 ′ of the first control module 101 .

[0079] When the multidirectional switch K is connected to the first fixed contact, the first input terminal A1 of the second control module 102 detects the resistance signal of the first resistor Rc1, i.e., the resistance value of the first resistor Rc1, indicating that the bidirectional charging device 10 is a discharge device preparing to enter the discharge mode. At this time, the second control module 102 can control the second single-pole double-throw switch S1' to connect to the fixed contact connected to the second input terminal A2 of the second control module 102, and control the single-pole double-throw switch Sn to connect to the voltage output terminal of the second control module 102 to output the first target voltage, such as 12V.

[0080] When the voltage output terminal of the second control module 102 outputs the first target voltage, if the connection between the bidirectional charging device 10 and the target vehicle 20 is normal, the first voltage divider element 201 divides the first target voltage so that the voltage signal detected by the second input terminal A2 is less than a first preset value of the first target voltage. For example, if the first target voltage is 12V, then if the connection between the bidirectional charging device 10 and the target vehicle 20 is normal, the voltage detected by the second input terminal A2 of the second control module 102 is 9V. Therefore, if the voltage signal at the second input terminal A2 of the second control module 102 is less than the first preset value of the first target voltage, it indicates that the connection between the bidirectional charging device 10 and the target vehicle 20 is normal. At this time, the second control module 102 can control the current operating mode of the target vehicle 20 to switch to the discharge mode, such as controlling the bidirectional on-board charger of the target vehicle 20 to switch to the discharge mode.

[0081] In addition, the output parameters of the bidirectional on-board charger, such as frequency, phase, phase angle, etc., can be adjusted according to the grid parameters of the power grid received from the first control module 101, such as frequency, phase, phase angle, etc., so that the error between the output parameters of the bidirectional on-board charger and the grid parameters is within a preset error range.

[0082] Then, the single-pole double-throw switch Sn can be controlled to connect to the PWM output terminal of the second control module 102, and the duty cycle of the pulse signal output by the PWM output terminal can be adjusted according to the current discharge parameters of the target vehicle 20, such as the maximum allowable discharge current of the target vehicle 20, so as to control the PWM output terminal to output a pulse signal corresponding to the current discharge parameters. For example, the duty cycle of the pulse signal can be calculated as shown in the following table:

[0083] PWM duty cycle D Maximum allowable discharge current Imax / A 8％≤D＜10％ 6

[0084] When the PWM output terminal outputs a pulse signal corresponding to the current discharge parameters, the first detection terminal A1' of the first control module 101 detects the pulse signal and, in response thereto, controls the bidirectional charging device 10 to switch to the discharge mode. Alternatively, the current discharge parameters of the target vehicle 20 can be determined based on the pulse signal. Once it is determined that the current discharge parameters of the target vehicle 20 meet the load requirements, the bidirectional charging device 10 is controlled to switch to the discharge mode.

[0085] In this way, before the target vehicle 20 is discharged, the first voltage divider element 201 can be used to verify the connection status between the bidirectional charging device 10 and the target vehicle 20. When it is determined that the connection status between the bidirectional charging device 10 and the target vehicle 20 is normal, the target vehicle 20 and the bidirectional charging device 10 are controlled to switch to a discharge mode that is compatible with each other, thereby reducing ineffective switching of the discharge mode.

[0086] To further verify the connection status between the bidirectional charging device 10 and the target vehicle 20, in some embodiments, Figure 2 As shown, the first voltage dividing element 201 includes a first switch S2, a first voltage dividing resistor R1 and a second voltage dividing resistor R2;

[0087] The first switch S2 is grounded, the other end of the first switch S2 is connected to one end of the first voltage-dividing resistor R1, one end of the second voltage-dividing resistor R2 is grounded, and the other ends of the first voltage-dividing resistor R1 and the second voltage-dividing resistor R2 are connected to a fixed contact of the first single-pole double-throw switch S1;

[0088] The first control module 101 is further configured to control the first switch S2 to close in response to the pulse signal received by the first detection terminal A1 ′, and control the bidirectional charging device 10 to switch to a discharge mode when it is determined that the voltage detected by the first detection terminal A1 ′ decreases.

[0089] In some embodiments, the first voltage-dividing resistor R1 and the second voltage-dividing resistor R2 can be resistors of the same resistance. When the first control module 101 receives a pulse signal corresponding to the current discharge parameters of the target vehicle 20, it can control the first switch S2 to close. When the first switch S2 is closed, if the connection between the target vehicle 20 and the bidirectional charging device 10 is normal, the first and second voltage-dividing resistors R1 and R2 will simultaneously divide the voltage, reducing the voltage detected by the first detection terminal A1'. For example, assuming the voltage of the pulse signal is 12V, before the first switch S2 is closed, if the connection between the target vehicle 20 and the bidirectional charging device 10 is normal, the second voltage-dividing resistor R2 will divide the voltage, and the voltage detected by the first detection terminal A1' of the first control module 101 should be 9V. Therefore, before the first switch S2 is closed, if the voltage of the pulse signal detected by the first detection terminal A1' of the first control module 101 is 9V and the duty cycle range of the pulse signal is within a preset range, such as 8% ≤ D ≤ 85%, the first switch S2 can be controlled to close. When the first switch S2 is closed, if the connection between the target vehicle 20 and the bidirectional charging device 10 remains normal, the first and second voltage-dividing resistors R1 and R2 will simultaneously divide the voltage, causing the voltage detected by the first detection terminal A1' of the first control module 101 to decrease. Therefore, after controlling the closing of the first switch S2, if the voltage detected by the first detection terminal A1' decreases, for example, from 9V to 6V, it can be determined that the connection between the target vehicle 20 and the bidirectional charging device 10 remains normal, and that the first voltage-dividing resistor R1 is able to divide the voltage. At this point, the bidirectional charging device 10 is controlled to switch to discharge mode, allowing the target vehicle 20 to charge the load through the bidirectional charging device 10.

[0090] To improve the discharge safety of the target vehicle 20, in some embodiments, the first control module 101 is further configured to determine that the pulse signal is abnormal and disconnect the first switch S2;

[0091] The second control module 102 is further configured to determine that the first switch S2 is disconnected, and control the target vehicle 20 to exit the discharge mode.

[0092] In some embodiments, when the target vehicle 20 switches to discharge mode, the PWM output terminal of the second control module 102 outputs a pulse signal corresponding to the current discharge parameters of the target vehicle 20 to the first detection terminal A1' of the first control module 101. Therefore, the first detection terminal A1' of the first control module 101 obtains the current maximum allowable discharge current of the target vehicle 20 from the received pulse signal. If the first control module 101 detects that the maximum allowable discharge current is less than a preset current, such as less than the supply current required by the load connected to the bidirectional charging device 10, this indicates an abnormal pulse signal. In this case, the first control module 101 can control the first switch S2 to open. When the first switch S2 is open, the voltage detected by the second input terminal A2 of the second control module 102 increases because the first voltage divider resistor R1 does not divide the voltage. At this point, the second control module 102 determines that the first switch S2 is open. Upon determining that the first switch S2 is open, the second control module 102 controls the target vehicle 20 to exit discharge mode, thereby preventing overdischarge in the discharge circuit of the target vehicle 20 and improving discharge safety of the target vehicle 20.

[0093] In order to reduce the ineffective switching of the charging modes of the bidirectional charging device 10 and the target vehicle 20, in some embodiments, as shown in FIG. Figure 2 As shown, the other fixed contact of the first single-pole double-throw switch S1 is connected to the second detection terminal A2' of the first control module 101 and the output terminal of the first control module 101;

[0094] The second steering circuit further includes a second voltage divider element 202, one end of which is grounded, and the other end of which is connected to another fixed contact of the second single-pole double-throw switch S1', which is connected to the third input terminal A3 of the second control module 102.

[0095] The first control module 101 is further configured to respond to a vehicle charging instruction and switch the first single-pole double-throw switch S1 to a fixed contact connected to the second detection terminal A2' of the first control module 101;

[0096] The second control module 102 is configured to control the current operating mode of the target vehicle 20 to switch to the charging mode according to the resistance signal corresponding to the charging instruction of the target vehicle 20, and then switch the second single-pole double-throw switch S1' to a fixed contact connected to the third input terminal A3 of the second control module 102 to adjust the pulse signal output to the first control module 101;

[0097] The first control module 101 is configured to determine whether the voltage of the pulse signal is less than or equal to a preset voltage, control the output terminal of the first control module 101 to output a second target voltage, and then detect the voltage signal received by the second detection terminal A2'. If it is determined that the voltage signal received by the second detection terminal A2' is a second preset value less than the second target voltage, the bidirectional charging device 10 is switched to a charging mode.

[0098] The second voltage divider element 202 may include a voltage divider resistor. The output terminal of the first control module 101 may also include a voltage output terminal and a PWM output terminal. The voltage output terminal and the PWM output terminal of the first control module 101 may be connected to another fixed contact of the first single-pole double-throw switch S1 via a single-pole double-throw switch Sn'. For example, the voltage output terminal of the first control module 101 may be a +12V voltage output terminal.

[0099] When the first control module 101 receives a vehicle charging instruction, it can control the multidirectional switch K to connect to the second fixed contact, and simultaneously control the first single-pole double-throw switch S1 to connect to the fixed contact connected to the second detection terminal A2 ′ of the first control module 101 .

[0100] When the multi-directional switch K is connected to the second fixed contact, the first input terminal A1 of the second control module 102 detects the resistance signal of the second resistor Rc2, i.e., the resistance value of the second resistor Rc2, indicating that the bidirectional charging device 10 is ready to enter the charging mode. At this time, the second control module 102 can control the target vehicle 20 to switch to the charging mode and then control the second single-pole double-throw switch S1' to connect the fixed contact connected to the third input terminal A3 of the second control module 102.

[0101] When the second single-pole double-throw switch S1' connects to the fixed contact connected to the third input terminal A3 of the second control module 102, the pulse signal output to the first control module 101 is 0. At this time, if the voltage of the pulse signal detected by the second detection terminal A2' of the first control module 101 is less than a preset voltage, such as less than 1V, it indicates that the second control module 102 has controlled the target vehicle 20 to switch to charging mode. At this time, the first control module 101 can control the single-pole double-throw switch Sn' to connect to the voltage output terminal of the first control module 101 to output a second target voltage, such as 12V. When the voltage output terminal of the first control module 101 outputs the second target voltage, if the connection between the bidirectional charging device 10 and the target vehicle 20 is normal, the second voltage divider 202 divides the second target voltage so that the voltage signal detected by the second detection terminal A2' is a second preset value less than the second target voltage. For example, if the second target voltage is 12V, then if the connection between the bidirectional charging device 10 and the target vehicle 20 is normal, the voltage detected by the second detection terminal A2' of the first control module 101 will be 9V. Therefore, if the voltage signal at the second detection terminal A2' of the first control module 101 is a second preset value less than the second target voltage, it indicates that the connection between the bidirectional charging device 10 and the target vehicle 20 is normal. In this case, the first control module 101 can control the bidirectional charging device 10 to switch to charging mode.

[0102] In this way, before the target vehicle 20 is charged, the second voltage divider element 202 can be used to verify the connection status between the bidirectional charging device 10 and the target vehicle 20. When it is determined that the connection status between the bidirectional charging device 10 and the target vehicle 20 is normal, the target vehicle 20 and the bidirectional charging device 10 are controlled to switch to a charging mode that is compatible with each other, thereby reducing ineffective switching of charging modes.

[0103] To further verify the connection status between the bidirectional charging device 10 and the target vehicle 20, in some embodiments, Figure 2 As shown, the second voltage dividing element 202 includes a second switch S2 ′, a third voltage dividing resistor R3 and a fourth voltage dividing resistor R4;

[0104] The second switch S2′ is grounded, the other end of the second switch S2′ is connected to one end of the third voltage-dividing resistor R3, one end of the fourth voltage-dividing resistor R4 is grounded, and the other ends of the third voltage-dividing resistor R3 and the fourth voltage-dividing resistor R4 are connected to the other fixed contact of the second single-pole double-throw switch S1′;

[0105] The second control module 102 is further configured to determine that the voltage signal received by the third input terminal A3 is a third preset value that is less than the second target voltage, and control the second switch S2 ′ to be closed.

[0106] In some embodiments, the third voltage-dividing resistor R3 and the fourth voltage-dividing resistor R4 may be resistors of the same resistance.

[0107] When the first control module 101 controls the single-pole double-throw switch Sn' to connect to the voltage output terminal of the first control module 101, if the connection between the bidirectional charging device 10 and the target vehicle 20 is normal, the second voltage divider element 202 divides the second target voltage output by the voltage output terminal of the first control module 101 so that the voltage signal detected by the third input terminal A3 of the second control module 102 is a third preset value less than the second target voltage. For example, if the second target voltage is 12V, then if the connection between the bidirectional charging device 10 and the target vehicle 20 is normal, the voltage detected by the third input terminal A3 of the second control module 102 is 9V. Therefore, if the voltage signal at the third input terminal A3 of the second control module 102 is less than the third preset value of the second target voltage, it indicates that the connection between the bidirectional charging device 10 and the target vehicle 20 is normal. At this time, the second control module 102 controls the second switch S2' to close, so that the third and fourth voltage divider resistors R3 and R4 can jointly divide the voltage.

[0108] When the second switch S2' is closed, if the connection between the bidirectional charging device 10 and the target vehicle 20 is normal, the voltage at the second detection terminal A2' of the first control module 101 will decrease. For example, if the second target voltage output by the voltage output terminal of the first control module 101 is 12V, the voltage detected by the second detection terminal A2' of the first control module 101 will decrease from 9V to 6V when the second switch S2' is closed. Therefore, the second preset value can be set to 6V. If the voltage signal at the second detection terminal A2' of the first control module 101 is 6V, it indicates that the connection between the bidirectional charging device 10 and the target vehicle 20 is normal. At this time, the first control module 101 can control the bidirectional charging device 10 to switch to charging mode. At the same time, the first control module 101 can control the single-pole double-throw switch Sn' to connect to the PWM output terminal of the first control module 101, so that the charging parameters of the bidirectional charging device 10, such as the charging current and / or charging voltage of the bidirectional charging device 10, can be transmitted to the second control module 102 via the PWM output terminal.

[0109] In order to improve the charging safety of the target vehicle 20, in some embodiments, the second control module 102 is further used to determine that the charging of the target vehicle 20 is abnormal and disconnect the second switch S2'; the first control module 101 is further used to determine that the second switch S2' is disconnected and control the bidirectional charging device 10 to exit the charging mode.

[0110] In some embodiments, when the target vehicle 20 switches to the charging mode, the second control module 102 can detect whether the target vehicle 20 has a charging abnormality. For example, the battery parameters of the target vehicle 20 battery, such as the battery charging capacity, can be detected to determine whether a charging abnormality has occurred. If the second control module 102 detects that the target vehicle 20 has a charging abnormality, such as the battery charging capacity is greater than the preset capacity, the second switch S2' can be controlled to be disconnected. When the second switch S2' is disconnected, since the third voltage-dividing resistor R3 does not divide the voltage, the voltage detected by the second detection terminal A2' of the first control module 101 will rise. At this time, the first control module 101 can determine that the second switch S2' is disconnected, and when it is determined that the second switch S2' is disconnected, the bidirectional charging device 10 can be controlled to exit the charging mode to improve the charging safety of the target vehicle 20.

[0111] In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in this application will be described clearly and completely below. In some embodiments, Figure 3 As shown, the bidirectional charging device 10 includes a first single-pole double-throw relay K1, a second single-pole double-throw relay K2, a first relay K3, and a second relay K4. The common contact of the first single-pole double-throw relay K1 and the common contact of the second single-pole double-throw relay K2 are connected to the load 30. A fixed contact of the first single-pole double-throw relay K1 is connected to the first live wire L of the power grid, and a fixed contact of the second single-pole double-throw relay K2 is connected to the first neutral wire N of the power grid. One end of the first relay K3 is connected to the second live wire L1 of the power grid, and one end of the second relay K4 is connected to the second neutral wire N1 of the power grid. The other end of the first relay K3 is connected to the other fixed contact of the first single-pole double-throw relay K1 and one end of the bidirectional on-board charger 103 of the target vehicle 20. The other end of the second relay K4 is connected to the other fixed contact of the second single-pole double-throw relay K2 and the other end of the bidirectional on-board charger 103 of the target vehicle 20.

[0112] When it is necessary to switch to the discharge mode, the first control module 101 can control the first relay K3 and the second relay K4 to disconnect, and control the first single-pole double-throw relay K1 to connect the fixed contact connected to the first relay K3, and control the second single-pole double-throw relay K2 to connect the fixed contact connected to the second relay K4, so that the target vehicle 20 can charge the load 30 through the bidirectional charging device 10.

[0113] When it is necessary to exit the discharge mode, in order to avoid power outage of the load 30, the first control module 101 can first control the first single-pole double-throw relay K1 to connect the fixed contact connected to the first live wire L, and control the second single-pole double-throw relay K2 to connect the fixed contact connected to the first neutral wire N. After completing the switching of the first single-pole double-throw relay K1 and the second single-pole double-throw relay K2, the first switch S2 is controlled to be disconnected to notify the target vehicle 20 that the discharge mode can be exited.

[0114] When it is necessary to switch to the charging mode, the first control module 101 can control the first relay K3 and the second relay K4 to be closed, so that the target vehicle 20 can be charged through the power grid connected to the bidirectional charging device 10 .

[0115] Figure 4 A flow chart of a control method for a charge-discharge steering circuit provided by an embodiment of the present application is shown. The control method for a charge-discharge steering circuit is applied to the first control module in the charge-discharge steering circuit in any of the above embodiments.

[0116] In some embodiments, the control method of the charge and discharge steering circuit includes:

[0117] Step 101, in response to a control instruction, controlling the multidirectional switch to switch to a corresponding fixed contact, so as to output a resistance signal corresponding to the control instruction to the second control module;

[0118] Step 102: receiving a pulse signal fed back by the second control module according to the resistance signal, and controlling the bidirectional charging device to switch to a target operating mode matching the current operating mode according to the pulse signal;

[0119] The second control module switches the current working mode of the target vehicle according to the resistance signal, and adjusts the pulse signal output to the first control module according to the switched current working mode;

[0120] The control instruction includes a vehicle charging instruction or a vehicle discharging instruction, and the current working mode and the target working mode both include a charging mode or a discharging mode.

[0121] In some embodiments, as Figure 5 As shown, another control method for a charge and discharge steering circuit is also provided. The control method for a charge and discharge steering circuit is applied to the second control module in the charge and discharge steering circuit in any of the above embodiments, including:

[0122] Step 201: Control the bidirectional charging device to switch to a target operating mode matching the current operating mode according to the received resistance signal;

[0123] Step 202: Adjust the pulse signal output to the first control module according to the current operating mode after switching, so that the first control module controls the bidirectional charging device to switch to a target operating mode that matches the current operating mode according to the pulse signal;

[0124] The resistance signal is generated by the first control module responding to a control instruction to control the multi-directional switch to switch to a corresponding fixed contact;

[0125] The control instruction includes a vehicle charging instruction or a vehicle discharging instruction, and the current working mode and the target working mode both include a charging mode or a discharging mode.

[0126] Figure 6 The schematic structural block diagram of a control device for a charge and discharge steering circuit provided in an embodiment of the present application is shown. It should be understood that the device is Figure 4 The method embodiment executed in the embodiment corresponds to the embodiment of the method, and can execute the steps involved in the aforementioned method. The specific functions of the device can be found in the description above. To avoid repetition, the detailed description is appropriately omitted here. The device includes at least one software function module that can be stored in a memory in the form of software or firmware or fixed in the operating system (OS) of the device. Specifically, the device can be applied to the first control module in any of the above embodiments.

[0127] In one embodiment, if Figure 6 As shown, a control device for a charge and discharge steering circuit is provided, comprising:

[0128] a control instruction response unit 210, configured to respond to a control instruction and control the multidirectional switch to switch to a corresponding fixed contact, so as to output a resistance signal corresponding to the control instruction to the second control module;

[0129] a charging device control unit 220, configured to receive a pulse signal fed back by the second control module according to the resistance signal, and control the bidirectional charging device to switch to a target operating mode matching the current operating mode according to the pulse signal;

[0130] The second control module switches the current working mode of the target vehicle according to the resistance signal, and adjusts the pulse signal output to the first control module according to the switched current working mode;

[0131] The control instruction includes a vehicle charging instruction or a vehicle discharging instruction, and the current working mode and the target working mode both include a charging mode or a discharging mode.

[0132] Figure 7The schematic structural block diagram of a control device for a charge and discharge steering circuit provided in an embodiment of the present application is shown. It should be understood that the device is Figure 5 The method embodiment executed in the embodiment corresponds to the embodiment of the method, and can perform the steps involved in the aforementioned method. The specific functions of the device can be found in the description above. To avoid repetition, the detailed description is appropriately omitted here. The device includes at least one software function module that can be stored in a memory in the form of software or firmware or fixed in the operating system (OS) of the device. Specifically, the device can be applied to the second control module in any of the above embodiments.

[0133] In one embodiment, if Figure 7 As shown, a control device for a charge and discharge steering circuit is provided, comprising:

[0134] a target vehicle control unit 310, configured to control the bidirectional charging device to switch to a target operating mode matching the current operating mode according to the received resistance signal;

[0135] a pulse signal adjustment unit 320 configured to adjust the pulse signal output to the first control module according to the current operating mode after switching, so that the first control module controls the bidirectional charging device to switch to a target operating mode matching the current operating mode according to the pulse signal;

[0136] The resistance signal is generated by the first control module responding to a control instruction to control the multi-directional switch to switch to a corresponding fixed contact;

[0137] The control instruction includes a vehicle charging instruction or a vehicle discharging instruction, and the current working mode and the target working mode both include a charging mode or a discharging mode.

[0138] Figure 8 An example of a physical structure diagram of an electronic device is shown below. Figure 8 As shown, the electronic device may include: a processor 81, a communication interface 82, a memory 83, and a communication bus 840, wherein the processor 81, the communication interface 82, and the memory 83 communicate with each other via the communication bus 840. The processor 81 may call a computer program in the memory 83 to execute the control method of the charge and discharge steering circuit in any of the above embodiments.

[0139] In addition, the logic instructions in the above-mentioned memory 83 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when sold or used as an independent product. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the various embodiments of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0140] On the other hand, an embodiment of the present application also provides a storage medium, which includes a computer program. The computer program can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the control method of the charge and discharge steering circuit provided in the above embodiments.

[0141] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units. That is, they may be located in one place or distributed across multiple network units. Some or all of the modules may be selected based on actual needs to achieve the objectives of the present embodiment. Persons of ordinary skill in the art will be able to understand and implement the present invention without inventive effort.

[0142] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, or of course, by hardware. Based on this understanding, the essence of the above technical solution or the part that contributes to the existing technology can be embodied in the form of a software product. The computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a magnetic disk, an optical disk, etc., and includes a number of instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or certain parts of the embodiments.

[0143] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A charge and discharge steering circuit, characterized in that: The invention comprises a first pilot circuit provided in a bidirectional charging device and a second pilot circuit provided in a target vehicle, wherein the bidirectional charging device is connected to the target vehicle to connect the first pilot circuit and the second pilot circuit; The first steering circuit includes a multi-directional switch, a first resistor, a second resistor, and a first control module for controlling the bidirectional charging device, and the second steering circuit includes a second control module for controlling the target vehicle; The common contact of the multidirectional switch is grounded, the first fixed contact of the multidirectional switch is connected to the first end of the first resistor, the second fixed contact of the multidirectional switch is connected to the first end of the second resistor, the second end of the first resistor and the second end of the second resistor are connected to the first input end of the second control module, and the first resistor and the second resistor have different resistance values; The first control module is used to respond to a control instruction and control the multi-directional switch to switch to a corresponding fixed contact, so as to output a resistance signal corresponding to the control instruction to the second control module; The second control module is used to switch the current working mode of the target vehicle according to the resistance signal, and adjust the pulse signal output to the first control module according to the current working mode after switching; The first control module is further configured to control the bidirectional charging device to switch to a target operating mode matching the current operating mode according to the pulse signal; Wherein, the control instruction includes a vehicle charging instruction or a vehicle discharging instruction, and the current working mode and the target working mode both include a charging mode or a discharging mode; The first steering circuit further includes a first single-pole double-throw switch and a first voltage divider element, and the second steering circuit further includes a second single-pole double-throw switch; A fixed contact of the first single-pole double-throw switch is connected to the first detection terminal of the first control module and one end of the first voltage dividing element, and the other end of the first voltage dividing element is grounded; The common contact of the second single-pole double-throw switch is connected to the common contact of the first single-pole double-throw switch, and a fixed contact of the second single-pole double-throw switch is connected to the second input terminal of the second control module and the signal output terminal of the second control module; The first control module is further configured to switch the first single-pole double-throw switch to a fixed contact connected to the first detection terminal of the first control module in response to a vehicle discharge instruction; The second control module is used to switch the second single-pole double-throw switch to a fixed contact connected to the second input terminal of the second control module according to the resistance signal corresponding to the discharge instruction of the target vehicle, and control the signal output terminal of the second control module to output a first target voltage, and then detect the voltage signal of the second input terminal, so as to switch the current operating mode of the target vehicle to the discharge mode when it is determined that the voltage signal detected at the second input terminal is less than a first preset value of the first target voltage, and control the signal output terminal to output a pulse signal corresponding to the current discharge parameter according to the current discharge parameter of the target vehicle.

2. The charge and discharge steering circuit according to claim 1, characterized in that: The first control module is specifically configured to: In response to a control instruction, the multi-directional switch is controlled to be disconnected; When it is determined that the disconnection time of the multidirectional switch reaches a preset time, the switch is switched to a fixed contact corresponding to the control instruction to output a resistance signal corresponding to the control instruction to the second control module.

3. The charge and discharge steering circuit according to claim 1, characterized in that: The first voltage dividing element includes a first switch, a first voltage dividing resistor and a second voltage dividing resistor; The first switch is grounded, the other end of the first switch is connected to one end of the first voltage-dividing resistor, one end of the second voltage-dividing resistor is grounded, and the other ends of the first voltage-dividing resistor and the second voltage-dividing resistor are connected to a fixed contact of a first single-pole double-throw switch; The first control module is further configured to respond to a pulse signal corresponding to the current discharge parameter received by the first detection end, control the first switch to close, and control the bidirectional charging device to switch to a discharge mode when it is determined that the voltage detected by the first detection end is reduced.

4. The charge and discharge steering circuit according to claim 3, characterized in that: The first control module is further configured to determine that the pulse signal is abnormal and disconnect the first switch; The second control module is further configured to determine that the first switch is disconnected and control the target vehicle to exit the discharge mode.

5. The charge and discharge steering circuit according to any one of claims 2 to 4, characterized in that: The other fixed contact of the first single-pole double-throw switch is connected to the second detection end of the first control module and the output end of the first control module; The second steering circuit further includes a second voltage divider element, one end of the second voltage divider element is grounded, the other end of the second voltage divider element is connected to another fixed contact of the second single-pole double-throw switch, and the other fixed contact of the second single-pole double-throw switch is connected to the third input terminal of the second control module; The first control module is further configured to switch the first single-pole double-throw switch to a fixed contact connected to the second detection terminal of the first control module in response to a vehicle charging instruction; The second control module is configured to control the current operating mode of the target vehicle to switch to the charging mode according to the resistance signal corresponding to the charging instruction of the target vehicle, and then switch the second single-pole double-throw switch to a fixed contact connected to the third input terminal of the second control module to adjust the pulse signal output to the first control module; The first control module is used to determine whether the voltage of the pulse signal is less than a preset voltage, control the output end of the first control module to output a second target voltage, and then detect the voltage signal received by the second detection end, so as to switch the bidirectional charging device to a charging mode when it is determined that the voltage signal received by the second detection end is a second preset value less than the second target voltage.

6. The charge and discharge steering circuit according to claim 5, characterized in that: The second voltage dividing element includes a second switch, a third voltage dividing resistor and a fourth voltage dividing resistor; The second switch is grounded, the other end of the second switch is connected to one end of the third voltage-dividing resistor, one end of the fourth voltage-dividing resistor is grounded, and the other ends of the third and fourth voltage-dividing resistors are connected to another fixed contact of the second single-pole double-throw switch; The second control module is further configured to determine that the voltage signal received by the third input terminal is a third preset value that is less than the second target voltage, and control the second switch to be closed.

7. The charge and discharge steering circuit according to claim 6, characterized in that: The second control module is further configured to determine that the target vehicle is abnormally charged and disconnect the second switch; The first control module is further configured to determine that the second switch is disconnected, and control the bidirectional charging device to exit a charging mode.

8. A method for controlling a charge and discharge steering circuit, characterized in that: The method applied to the first control module of the charge and discharge steering circuit according to any one of claims 1 to 7 includes: In response to a control instruction, controlling the multidirectional switch to switch to a corresponding fixed contact, so as to output a resistance signal corresponding to the control instruction to the second control module; receiving a pulse signal fed back by the second control module according to the resistance signal, and controlling the bidirectional charging device to switch to a target operating mode matching the current operating mode according to the pulse signal; The second control module switches the current working mode of the target vehicle according to the resistance signal, and adjusts the pulse signal output to the first control module according to the switched current working mode; The control instruction includes a vehicle charging instruction or a vehicle discharging instruction, and the current working mode and the target working mode both include a charging mode or a discharging mode.

9. A method for controlling a charge and discharge steering circuit, characterized in that: The method applied to the second control module in the charge and discharge steering circuit according to any one of claims 1 to 7 includes: controlling the bidirectional charging device to switch to a target operating mode matching the current operating mode according to the received resistance signal; adjusting the pulse signal output to the first control module according to the current operating mode after switching, so that the first control module controls the bidirectional charging device to switch to a target operating mode matching the current operating mode according to the pulse signal; The resistance signal is generated by the first control module responding to a control instruction to control the multi-directional switch to switch to a corresponding fixed contact; The control instruction includes a vehicle charging instruction or a vehicle discharging instruction, and the current working mode and the target working mode both include a charging mode or a discharging mode.

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