Discharge circuit and discharge control method for motor controller

Abstract

The application provides a discharge circuit and a discharge control method of a motor controller, the discharge circuit comprising a bus capacitor, an active discharge resistor circuit, an electric drive system loop, a signal processing module and a master control module; the active discharge resistor circuit is connected in parallel across the bus capacitor; the electric drive system loop is connected in parallel across the bus capacitor; the signal processing module is connected to the active discharge resistor circuit, and outputs a discharge signal to the active discharge resistor circuit when a vehicle collision signal and a drive chip fault signal are collected; the master control module is connected to the signal processing module, the active discharge resistor circuit and the electric drive system loop, and outputs a discharge signal to the electric drive system loop during a period when no drive chip fault signal is received; and outputs a discharge signal to the active discharge resistor circuit during a period when a drive chip fault signal is received and no vehicle collision signal is received. The bus capacitor voltage is discharged in time, and the reliability of the discharge circuit and the safety of the vehicle are ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicles, in particular to a discharge circuit and a discharge control method of a motor controller. BACKGROUND

[0002] The motor controller of the current new energy vehicle and the like is connected with the high-voltage power battery of the vehicle through a relay, when the relay is disconnected, the power supply of the motor controller is disconnected, but a large amount of electric charge is still stored in the bus capacitor of the motor controller, and the energy of the bus capacitor needs to be released through active discharge and passive discharge.

[0003] The passive discharge is performed through a passive discharge resistor, the passive discharge resistor is directly connected in parallel across the capacitor and has no switch control, and when the electric drive system is working normally, heat and energy loss will always be generated. If the passive discharge resistor is selected to have a large resistance value, the discharge time is long, if the passive discharge resistor is selected to have a small resistance value, the problem of heating of the resistor is serious, and the loss is also increased, and therefore the active discharge function needs to be added.

[0004] The active discharge includes two modes of hardware active discharge and software active discharge, when the vehicle is in collision, the active discharge resistor circuit switch cannot be controlled through the master control module, and when the electric drive system loop fails, the active discharge cannot be performed.

[0005] In summary, the existing discharge strategy has the risk that the bus voltage cannot be quickly discharged after the vehicle is in collision. SUMMARY

[0006] In view of the deficiencies of the prior art, the purpose of the present application is to provide a discharge circuit of a motor controller, which can quickly discharge the bus capacitor voltage when the vehicle is in collision and the electric drive system loop fails, that is, the electric charge stored in the bus capacitor is quickly discharged, and the reliability of the active discharge and the safety of the vehicle are ensured.

[0007] The above technical purpose of the present application is achieved by the following technical scheme:

[0008] The discharge circuit of the motor controller comprises a bus capacitor, an active discharge resistance circuit, an electric drive system loop, a signal processing module and a master control module; the active discharge resistance circuit is connected in parallel across the bus capacitor; the electric drive system loop is connected in parallel across the bus capacitor; the signal processing module is connected to the active discharge resistance circuit and is used to collect the vehicle collision signal and the driving chip fault signal and output a discharge signal to the active discharge resistance circuit when the vehicle collision signal and the driving chip fault signal are collected; the master control module is connected to the signal processing module, the active discharge resistance circuit and the electric drive system loop and is used to output a discharge signal to the electric drive system loop during the period when no driving chip fault signal is received; and a discharge signal is output to the active discharge resistance circuit during the period when the driving chip fault signal is received and no vehicle collision signal is received.

[0009] Further, the signal processing module comprises a signal collection unit connected to the master control module and used to collect the vehicle collision signal and the driving chip fault signal and send them to the master control module; and a logic operation circuit with an input end connected to the signal collection unit and an output end connected to the active discharge resistance circuit.

[0010] Further, the active discharge resistance circuit comprises a first field effect transistor with a source connected to a first input end of the electric drive system loop and one end of the bus capacitor, a gate connected to the master control module and the logic operation circuit and used to realize the conduction or turn-off of the active discharge resistance circuit; and an active discharge resistance with one end connected to a drain of the first field effect transistor and the other end connected to a second input end of the electric drive system loop and the other end of the bus capacitor.

[0011] Further, the electric drive system loop comprises a driving motor and three driving branches; each driving branch is connected in parallel across the bus capacitor and comprises a second field effect transistor and a third field effect transistor connected in series; the gates of the second field effect transistor and the third field effect transistor of each driving branch are connected to the master control module and used to receive the discharge signal sent by the master control module; and the three input ends of the driving motor are one-to-one connected to the drains of the second field effect transistors of the three driving branches.

[0012] Further, the discharge circuit further comprises a passive discharge resistance circuit, which comprises a passive discharge resistance connected in parallel across the bus capacitor.

[0013] Furthermore, the present application also provides a discharge control method, which is applied to the discharge circuit of the above-mentioned motor controller. The control method includes: when the main control module receives a vehicle discharge instruction, the main control module determines whether the driver chip fault signal and the vehicle collision signal transmitted by the signal processing module are received; if the driver chip fault signal is not received, the main control module outputs a discharge signal to the electric drive system circuit; if the driver chip fault signal is received and the vehicle collision signal is not received, the main control module outputs a discharge signal to the active discharge resistor circuit; if the driver chip fault signal and the vehicle collision signal are received, the signal processing module outputs a discharge signal to the active discharge resistor circuit.

[0014] Furthermore, after the main control module outputs a discharge signal to the electric drive system circuit, the method further includes: the electric drive system circuit is turned on, the active discharge resistance circuit is disconnected, and the electric drive system circuit discharges the charge stored in the bus capacitor.

[0015] Furthermore, after the main control module outputs a discharge signal to the active discharge resistor circuit, the method further includes: the active discharge resistor circuit is turned on, the electric drive system loop is disconnected, and the active discharge resistor circuit discharges the charge stored in the bus capacitor.

[0016] Furthermore, after the signal processing module outputs a discharge signal to the active discharge resistor circuit, the method further includes: turning on the active discharge resistor circuit, disconnecting the electric drive system loop, and the active discharge resistor circuit discharging the charge stored in the bus capacitor.

[0017] Furthermore, the discharge circuit also includes a passive discharge resistance circuit, the passive discharge resistance circuit includes a passive discharge resistor, and the passive discharge resistor is connected in parallel at both ends of the bus capacitor. The method also includes: the passive discharge resistance circuit discharges the charge stored in the bus capacitor.

[0018] The beneficial effects of the embodiments of the present invention are:

[0019] First, an embodiment of the present application provides a discharge circuit of a motor controller, which is connected to an active discharge resistor circuit by setting a signal processing module. When it collects a vehicle collision signal and a drive chip fault signal, it outputs a discharge signal to the active discharge resistor circuit. Conversely, it outputs a discharge signal to the electric drive system circuit or the active discharge resistor circuit through the main control module. When the vehicle collides or the electric drive system circuit fails, the active discharge resistor circuit can be directly controlled to be turned on or off through the signal processing module, thereby solving the problem that the discharge signal cannot be sent through the main control module to control the conduction or shutoff of the electric drive system circuit when the vehicle collides. The bus capacitor voltage can be discharged in time, ensuring the reliability of the discharge circuit and the safety of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments of the present application.

[0021] Figure 1 This is a schematic structural diagram of a discharge circuit according to an embodiment of the present application;

[0022] Figure 2 A circuit schematic diagram of a discharge circuit according to an embodiment of the present application;

[0023] Figure 3 A circuit schematic diagram of a discharge circuit according to another embodiment of the present application;

[0024] Figure 4 This is a flow chart of a discharge control method according to an embodiment of the present application.

[0025] Figure numerals: busbar capacitor 1; active discharge resistor circuit 2; electric drive system circuit 3; drive motor 31; drive branch 32; signal processing module 4; signal acquisition unit 41; logic operation circuit 42; passive discharge resistor circuit 5; external power supply 6; main control module 7. DETAILED DESCRIPTION

[0026] In the description of this application, it should be noted that the terms "inner" and "outer" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or the orientations or positional relationships in which the product of this application is typically placed when in use. These terms are intended solely to facilitate the description of this application and simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first" and "second" and the like are used solely for distinction and should not be construed as indicating or implying relative importance.

[0027] The purpose of the present invention is to provide a discharge circuit and discharge control method for a motor controller, so as to solve the problem that the discharge circuit of the existing motor controller cannot send a discharge signal through the main control module to quickly discharge the bus capacitor voltage when the whole vehicle collides.

[0028] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0029] See also Figure 1 -3. An embodiment of the present application provides a discharge circuit of a motor controller, including a bus capacitor 1, an active discharge resistor circuit 2, an electric drive system loop 3, a signal processing module 4 and a main control module 7.

[0030] The active discharge resistance circuit 2 is connected in parallel to both ends of the bus capacitor 1, the electric drive system loop 3 is connected in parallel to both ends of the bus capacitor 1, and the output end of the electric drive system loop 3 is connected to the load to drive the load to work or stop.

[0031] The signal processing module 4 is connected to the active discharge resistance circuit 2 and is used to collect the vehicle collision signal and the driver chip fault signal, and output a discharge signal to the active discharge resistance circuit 2 when the vehicle collision signal and the driver chip fault signal are collected.

[0032] The main control module 7 is connected to the signal processing module 4, the active discharge resistor circuit 2, and the electric drive system circuit 3 to receive the vehicle collision signal and the driver chip fault signal. It is configured to output a discharge signal to the electric drive system circuit 3 when the driver chip fault signal is not received, and to output a discharge signal to the active discharge resistor circuit 2 when the driver chip fault signal is received and the vehicle collision signal is not received. The main control module 7 may include an MCU (microprocessor).

[0033] In the above embodiment, the driver chip fault signal is used to indicate a power device fault, i.e., a fault in the electric drive system circuit. For example, when a low-level signal is received, it can be considered that a driver chip fault signal has been received. Similarly, when there is no fault, a high-level signal is received.

[0034] The vehicle collision signal is used to indicate that a collision has occurred in the vehicle. In one embodiment, the vehicle collision signal can be represented by a low level signal and a high level signal can be used to represent no fault.

[0035] It should be noted that the selection of a high-level signal or a low-level signal as the driver chip fault signal or the vehicle collision signal can be made according to actual needs.

[0036] By connecting the signal processing module 4 to the active discharge resistance circuit 2, the embodiment of the present application can realize that when the whole vehicle collides or the electric drive system circuit fails, that is, when the signal processing module 4 collects the whole vehicle collision signal and the drive chip fault signal, there is no need to control the active discharge resistance circuit 2 to be turned on or off through the main control module 7. Instead, the active discharge resistance circuit 2 is turned on or off by directly outputting a discharge signal to the active discharge resistance circuit 2 through the signal processing module 4, thereby realizing the rapid discharge of the bus capacitor 1 voltage, solving the problem that the bus capacitor 1 voltage cannot be discharged quickly after the whole vehicle collision, and ensuring the reliability of the vehicle's active discharge and the safety of the whole vehicle.

[0037] At the same time, when the signal processing module 4 does not collect the driver chip fault signal, the main control module 7 controls the electric drive system circuit 3 to discharge. When the signal acquisition unit 41 collects the driver chip fault signal but does not collect the vehicle collision signal, the main control module 7 controls the active discharge resistor circuit 2 to discharge.

[0038] In one embodiment, the discharge circuit further includes an external power supply 6, and both ends of the bus capacitor 1 are connected in parallel to the external power supply 6 to ensure that the motor controller can achieve rapid discharge when power is cut off, thereby protecting the safety of the circuit and electronic equipment.

[0039] In one embodiment, if Figure 3 As shown, the signal processing module 4 includes a signal acquisition unit 41 and a logic operation circuit 42 connected to each other.

[0040] The signal acquisition unit 41 is connected to the main control module 7 and is used to collect vehicle collision signals and driver chip fault signals and send them to the main control module 7 .

[0041] An input end of the logic operation circuit 42 is connected to the signal acquisition unit 41 , and an output end of the logic operation circuit 42 is connected to the active discharge resistance circuit 2 .

[0042] The signal acquisition unit 41 transmits the collected signal to the logic operation circuit 42 , and the logic operation circuit 42 performs a logic operation on the collected signal and outputs a discharge signal to the active discharge resistance circuit 2 according to the result obtained after the logic operation.

[0043] In the above embodiment, the logic operation circuit 42 may be an OR gate circuit, which performs a logic operation according to the vehicle collision signal (eg, low level) and the driver chip fault signal (eg, low level) and outputs the result.

[0044] When the vehicle collision signal is a low-level signal and the driver chip fault signal is a low-level signal, the above two low-level signals are input into the OR gate in the logic operation circuit 42. After the OR gate receives the above two low-level signals, the output of the OR gate is 0, which can control the switching device of the active discharge resistor circuit 2 to be turned on, so that the active discharge resistor circuit 2 discharges the bus capacitor 1.

[0045] In one embodiment, if Figure 2 As shown in FIG. 3 , the active discharge resistor circuit 2 includes a switch device and an active discharge resistor R2 connected in series.

[0046] The switching device may be a first field effect transistor Q7.

[0047] The source of the first field-effect transistor Q7 is connected to the first input end of the electric drive system loop 3 and one end of the bus capacitor 1, and the gate of the first field-effect transistor Q7 is connected to the main control module 7 and the logic operation circuit 42. By controlling the conduction or shutdown of the first field-effect transistor Q7, the active discharge resistance circuit 2 is turned on or off.

[0048] The first field effect transistor Q7 may be an NMOS transistor, which is turned on when the logic operation circuit 42 outputs a low-level signal (ie, a discharge signal).

[0049] One end of the active discharge resistor R2 is connected to the drain of the first field effect transistor Q7 , and the other end of the active discharge resistor R2 is connected to the second input end of the electric drive system loop 3 and the other end of the bus capacitor 1 .

[0050] In one embodiment, if Figure 2 As shown in FIG-3 , the electric drive system circuit 3 includes a drive motor 31 and three drive branches 32 .

[0051] Each driving branch 32 is connected in parallel across the bus capacitor and includes a second field effect transistor (FET) and a third field effect transistor (FET) connected in series. The second field effect transistor (Q1) is connected in series with the third field effect transistor (Q4), the second field effect transistor (Q2) is connected in series with the third field effect transistor (Q5), and the second field effect transistor (Q3) is connected in series with the third field effect transistor (Q6).

[0052] The gate of the second field effect transistor and the gate of the third field effect transistor of each driving branch 32 are connected to the main control module for receiving the discharge signal sent by the main control module; and the three input ends of the driving motor 31 are connected one by one to the drain of the second field effect transistor (Q1, Q2, Q3) of the three driving branches 32.

[0053] The discharge circuit also includes a passive discharge resistor circuit 5, which includes a passive discharge resistor R1. The passive discharge resistor R1 is connected in parallel at both ends of the bus capacitor 1. The natural discharge characteristics of the bus capacitor 1 are utilized to gradually release the voltage of the bus capacitor 1 to ensure that there will be no high voltage residual after the vehicle is powered off. The passive discharge resistor R1 can be selected with a larger resistance value.

[0054] An embodiment of the present application also provides a discharge control method, which can be applied to the discharge circuit of the above-mentioned motor controller, or to a vehicle that adopts the discharge circuit of the above-mentioned motor controller. The control method is used to obtain the vehicle collision signal and the drive chip fault signal, and according to the signal status of the vehicle collision signal and the drive chip fault signal, the discharge signal processing module 4 outputs a discharge signal to the active discharge resistor circuit 2, or controls the main control module 7 to output a discharge signal to the active discharge resistor circuit 2 or the electric drive system circuit 3.

[0055] See also Figure 4 , the control method includes:

[0056] When the main control module 7 receives the vehicle discharge instruction, the main control module 7 determines whether the driver chip fault signal and the vehicle collision signal transmitted by the signal processing module 4 are received.

[0057] In one embodiment, if the main control module 7 does not receive the driver chip fault signal, the main control module 7 outputs a discharge signal to the electric drive system circuit 3. After the main control module 7 outputs the discharge signal to the electric drive system circuit 3, the control method further includes turning on the electric drive system circuit 3, disconnecting the active discharge resistor circuit 2, and causing the electric drive system circuit 3 to discharge the charge stored in the bus capacitor 1.

[0058] In one embodiment, if the main control module 7 receives a driver chip fault signal but does not receive a vehicle collision signal, the main control module 7 outputs a discharge signal to the active discharge resistor circuit 2. The active discharge resistor circuit 2 is turned on, the electric drive system loop 3 is disconnected, and the active discharge resistor circuit 2 discharges the charge stored in the bus capacitor 1.

[0059] In one embodiment, if both a driver chip fault signal and a vehicle collision signal are received, that is, if the vehicle has collided and the electric drive system circuit 3 has failed, the signal processing module 4 outputs a discharge signal to the active discharge resistor circuit 2. The active discharge resistor circuit 2 then conducts, the electric drive system circuit 3 is disconnected, and the active discharge resistor circuit 2 discharges the charge stored in the bus capacitor 1.

[0060] The discharge circuit also includes a passive discharge resistance circuit 5, which includes a discharge resistor R1. The passive discharge resistor R1 is connected in parallel at both ends of the bus capacitor 1. The control method also includes the passive discharge resistance circuit 5 discharging the charge stored in the bus capacitor 1.

[0061] In the above embodiment, when the signal acquisition unit 41 acquires a vehicle collision signal and a driver chip fault signal, it is determined that the vehicle has collided and the electric drive system circuit 3 has failed, and the signal processing module 4 outputs a discharge signal to the active discharge resistor circuit 2. When the signal acquisition unit 41 does not acquire a vehicle collision signal or a driver chip fault signal, that is, the vehicle has not collided and the electric drive system circuit 3 has not failed, the main control module 7 controls the electric drive system circuit 3 to discharge. When the signal acquisition unit 41 acquires a driver chip fault signal but does not acquire a vehicle collision signal, that is, the vehicle has not collided but the electric drive system circuit 3 has failed, the main control module 7 controls the active discharge resistor circuit 2 to discharge.

[0062] The following is a detailed introduction to the vehicle's active discharge process:

[0063] Step S210 : When the main control module 7 receives the vehicle discharge instruction, the signal acquisition unit 41 collects the driver chip fault signal and the vehicle collision signal.

[0064] Step S220: The main control module 7 determines whether a driver chip fault signal is received.

[0065] Step S230 : If not, the main control module 7 sends a discharge signal to the electric drive system circuit 3 to control the electric drive system circuit 3 to be turned on, thereby discharging the voltage of the bus capacitor 1 , that is, discharging the charge stored in the bus capacitor 1 .

[0066] Step S240: If yes, the main control module 7 determines whether a vehicle collision signal is received.

[0067] Step S250: If not, that is, the main control module 7 receives the driver chip fault signal but does not receive the vehicle collision signal, that is, the signal acquisition unit 41 does not collect the vehicle collision signal, and the vehicle does not collide. After receiving the vehicle power-off instruction, the main control module 7 sends a discharge signal to the active discharge resistor circuit 2, controls the first field effect transistor Q7 to be turned on, so that the active discharge resistor circuit 2 intervenes to discharge the voltage of the bus capacitor 1.

[0068] Step S260: If yes, that is, the signal acquisition unit 41 collects the vehicle collision signal and the driver chip fault signal, and the vehicle has collided, the logic operation circuit 42 sends a discharge signal to the active discharge resistor circuit 2, controls the first field effect transistor Q7 to turn on, so that the active discharge resistor circuit 2 intervenes to discharge the voltage of the bus capacitor 1.

[0069] The above control method can achieve that when the whole vehicle collides, there is no need to send a discharge signal control through the main control module 7. The logic operation circuit 42 that receives the whole vehicle collision signal and the driver chip fault signal directly controls the active discharge resistor circuit 2 to intervene and discharge the charge stored in the bus capacitor 1. This reduces the risk that the bus capacitor 1 voltage cannot be quickly discharged due to the main control module 7 being unable to control after the whole vehicle collision, thereby improving the safety and reliability of the vehicle. When the whole vehicle collision signal and the driver chip fault signal are not received, the software discharge method can be used, and the main control module 7 can control the discharge of the electric drive system circuit 3. When the driver chip fault signal is received but the whole vehicle collision signal is not received, the hardware discharge method can be used, and the main control module 7 can control the active discharge resistor circuit 2 to discharge, so that discharge can be achieved when the vehicle is in different states.

[0070] In the embodiments provided in the present application, it should be understood that the disclosed control system and method can also be implemented in other ways. The control system embodiments described above are merely schematic. For example, the flowcharts and block diagrams in the accompanying drawings show the possible architecture, functions and operations of the control system, method and computer program product according to the present application. In this regard, each box in the flowchart or block diagram can represent a module, program segment or part of code, and the module, program segment or part of code includes one or more executable instructions for implementing a specified logical function.

[0071] It should also be noted that in some alternative implementations, the functions noted in the blocks may occur in a different order than that noted in the accompanying figures. For example, two consecutive blocks may actually be executed substantially in parallel, or they may sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flow charts, and combinations of blocks in the block diagrams and / or flow charts, may be implemented using a dedicated hardware-based system that performs the specified functions or actions, or may be implemented using a combination of dedicated hardware and computer instructions.

[0072] It should also be noted that, in the description of this application, unless otherwise expressly specified or limited, the terms "disposed" and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0073] It should be noted that, unless there is any conflict, the features in the embodiments of this application can be combined with each other.

[0074] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A discharge circuit of a motor controller, characterized in that: The discharge circuit comprises: busbar capacitance; an active discharge resistance circuit connected in parallel across the bus capacitor; An electric drive system circuit is connected in parallel at both ends of the bus capacitor; a signal processing module connected to the active discharge resistance circuit, configured to collect a vehicle collision signal and a driver chip fault signal, and output a discharge signal to the active discharge resistance circuit when the vehicle collision signal and the driver chip fault signal are collected; a main control module connected to the signal processing module, the active discharge resistance circuit, and the electric drive system circuit, and configured to output a discharge signal to the electric drive system circuit when no driver chip fault signal is received; and output a discharge signal to the active discharge resistance circuit when the driver chip fault signal is received and the vehicle collision signal is not received; Drive motor and three drive branches; Each of the driving branches is connected in parallel to both ends of the bus capacitor, and each of the driving branches includes a second field effect transistor and a third field effect transistor connected in series; the gate of the second field effect transistor and the gate of the third field effect transistor of each of the driving branches are connected to the main control module, for receiving a discharge signal sent by the main control module; The three input terminals of the driving motor are connected to the drains of the second field effect transistors of the three driving branches in a one-to-one correspondence.

2. The discharge circuit of the motor controller according to claim 1, characterized in that: The signal processing module includes: A signal acquisition unit, connected to the main control module, for collecting vehicle collision signals and driver chip fault signals, and sending them to the main control module; A logic operation circuit, wherein an input end thereof is connected to the signal acquisition unit, and an output end of the logic operation circuit is connected to the active discharge resistance circuit.

3. The discharge circuit of the motor controller according to claim 2, characterized in that: The active discharge resistance circuit comprises: a first field effect transistor, a source of which is connected to the first input end of the electric drive system loop and one end of the bus capacitor, and a gate of which is connected to the main control module and the logic operation circuit, for realizing the conduction or shutdown of the active discharge resistance circuit; An active discharge resistor, one end of which is connected to the drain of the first field effect transistor, and the other end of which is connected to the second input end of the electric drive system loop and the other end of the bus capacitor.

4. The discharge circuit of the motor controller according to claim 1, characterized in that: The discharge circuit further includes a passive discharge resistance circuit, which includes a passive discharge resistor. The passive discharge resistor is connected in parallel to both ends of the bus capacitor.

5. A discharge control method, characterized in that: The discharge circuit of the motor controller according to any one of claims 1 to 4, wherein the control method comprises: When the main control module receives the vehicle discharge instruction, the main control module determines whether it has received the driver chip fault signal and the vehicle collision signal transmitted by the signal processing module; If no driver chip fault signal is received, the main control module outputs a discharge signal to the electric drive system circuit; If a driver chip fault signal is received but no vehicle collision signal is received, the main control module outputs a discharge signal to the active discharge resistor circuit; If a driver chip fault signal and a vehicle collision signal are received, the signal processing module outputs a discharge signal to the active discharge resistance circuit.

6. The discharge control method according to claim 5, characterized in that: After the main control module outputs a discharge signal to the electric drive system circuit, the method further includes: The electric drive system circuit is turned on, the active discharge resistance circuit is turned off, and the electric drive system circuit discharges the charge stored in the bus capacitor.

7. The discharge control method according to claim 5, characterized in that: After the main control module outputs a discharge signal to the active discharge resistance circuit, the method further includes: The active discharge resistance circuit is turned on, the electric drive system circuit is disconnected, and the active discharge resistance circuit discharges the charge stored in the bus capacitor.

8. The discharge control method according to claim 5, wherein: After the signal processing module outputs the discharge signal to the active discharge resistance circuit, the method further includes: The active discharge resistance circuit is turned on, the electric drive system circuit is disconnected, and the active discharge resistance circuit discharges the charge stored in the bus capacitor.

9. The discharge control method according to claim 5, characterized in that: The discharge circuit further includes a passive discharge resistance circuit, the passive discharge resistance circuit includes a passive discharge resistor, and the passive discharge resistor is connected in parallel to both ends of the bus capacitor. The method further includes: The passive discharge resistance circuit discharges the charge stored in the bus capacitor.

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