New energy vehicle VCU system development verification circuit

Abstract

The invention discloses a new energy automobile VCU system development verification circuit, which comprises a power supply control module, a controller module and a multipath transformer conversion module, and is characterized in that a power supply is provided for a controller through a USB port of an industrial personal computer, and a resource port of the controller is connected with a control end of an executive device to control the executive device; the controller can also output PWM wave signals, high and low level signals and analog electric signals. And each signal controls the switch, the motor driver and the potentiometer.

Description

Technical Field

[0001] This invention relates to the field of new energy vehicle technology, specifically to a development and verification circuit for a new energy vehicle VCU system. Background Technology

[0002] The Vehicle Control Unit (VCU) is the "brain" and "central nervous system" of a new energy vehicle, and its core position determines the extreme importance of its development and verification. Its main functions include: Vehicle Energy Management: Coordinating energy distribution among high-voltage components such as the battery, motor, and air conditioning to optimize driving range. Drive Force Control: Interpreting driver intentions (accelerator pedal), calculating and issuing torque commands to the MCU to achieve vehicle acceleration, cruising, and deceleration. Vehicle Status Monitoring and Diagnosis: Real-time monitoring of key vehicle parameters (such as high-voltage interlock, insulation resistance, battery SOC, etc.) and performing fault diagnosis and handling to ensure safety. Coordinated Control: High-speed network communication (such as CAN / CAN FD) with nodes such as the BMS, MCU, TCU, DC-DC converter, and air conditioning controller to achieve collaborative work between various systems. Fault Handling and Limp-Home: In the event of a fault, taking strategies such as alarms, power limiting, and safe power-off according to the fault level to ensure the vehicle's basic driving capability.

[0003] Currently, there is a critical "verification gap" between the completion of VCU hardware design and HIL and real vehicle testing. Before the expensive HIL bench and dangerous real vehicle testing, we need a "stand-in" or "training ground" to safely, quickly and cost-effectively verify whether the VCU hardware itself and the underlying software are "healthy".

[0004] Therefore, this invention provides a simplified VCU circuit that saves cost and space for the development and verification of a new energy vehicle VCU system. Summary of the Invention

[0005] The purpose of this invention is to provide a development and verification circuit for a VCU system in a new energy vehicle, including a power control module, a controller module, and a multi-channel transformer conversion module. The multi-channel transformer conversion module includes a power input circuit and a DC BUCK step-down circuit. The control module includes a VCU controller, an indicator light circuit, a motor driver circuit, a CAN level conversion circuit, and a switch circuit. The indicator light circuit, motor driver circuit, CAN level conversion circuit, and switch circuit are all connected to the VCU controller. The power control module is connected to the power input circuit, and the DC BUCK step-down circuit is connected to the power input module.

[0006] Furthermore, the DC BUVK step-down circuit includes a first DC BUCK step-down circuit, a second DC BUCK step-down circuit, a third DC BUCK step-down circuit, and a fourth DC BUCK step-down circuit.

[0007] Furthermore, the power input circuit includes a reverse polarity protection diode D1, a switch S1, and a fuse F1, which are connected in series.

[0008] Furthermore, the first DC BUCK step-down circuit includes a light-emitting diode LED1, a resistor R1, a capacitor C1, an electrolytic capacitor C3, a switching regulator U4, an inductor L4, a freewheeling diode D2, an electrolytic capacitor C2, and a capacitor C4. The light-emitting diode LED1 is connected in series with the resistor R1. The capacitor C1 and the electrolytic capacitor C3 are connected in parallel and then connected to the input terminal +Vin of the switching regulator. The capacitor C4, the electrolytic capacitor C2, and the freewheeling diode D2 are connected in parallel and then connected in series with the inductor L4 and then connected to the output OUT of the switching regulator. The positive terminal of the electrolytic capacitor is connected to pin 4 fb of the switching regulator.

[0009] Furthermore, the second DC BUCK step-down circuit includes capacitor C5, electrolytic capacitor C6, switching regulator U2, freewheeling diode D5, inductor L3, freewheeling diode D5, electrolytic capacitor C7, and capacitor C8. Capacitor C5 and electrolytic capacitor C6 are connected in parallel and then connected to the input terminal +Vin of the switching regulator. Freewheeling diode D5, electrolytic capacitor C7, and capacitor C8 are connected in parallel and then connected in series with inductor L3 and then connected to the output terminal OUT of the switching regulator U1. The positive terminal of the electrolytic capacitor is connected to pin 4 fb of the switching regulator U1.

[0010] Furthermore, the third DC BUCK step-down circuit includes capacitor C9, electrolytic capacitor C10, switching regulator U2, freewheeling diode D5, inductor L2, electrolytic capacitor C12, and capacitor C13. Capacitors C9 and C10 are connected in parallel and then connected to the input terminal +Vin of switching regulator U2. Capacitors C13, C12, and D5 are connected in parallel and then connected in series with inductor L2 and then connected to the output terminal OUT of switching regulator U2. The positive terminal of electrolytic capacitor C12 is connected to pin 4 fb of switching regulator U2.

[0011] Furthermore, the fourth DC BUCK step-down circuit includes capacitor C14, electrolytic capacitor C15, switching regulator U3, freewheeling diode D4, inductor L1, electrolytic capacitor C16, resistor R2, and capacitor C17. Capacitors C14 and C15 are connected in parallel and then connected to the input terminal +Vin of switching regulator U3. Freewheeling diode D4, electrolytic capacitor C16, and capacitor C17 are connected in parallel and then connected in series with inductor L2 and then connected to the output terminal OUT of switching regulator U3. The positive terminal of electrolytic capacitor C16 and resistor R2 are connected to pin 4 fb of switching regulator U3.

[0012] Furthermore, the switching circuit includes potentiometer RP2, start switch S4, gear position switch S5, turn signal switch S6, switch S1, switch S2, and switch S3. Potentiometer RP2, start switch S4, gear position switch S5, and turn signal switch S6 are all connected to the VCU controller. Gear position switch S5 includes forward gear R3 and reverse gear R5. Turn signal switch S6 includes left turn switch R4 and right turn switch R6.

[0013] Furthermore, the motor driver circuit includes a driver switch S7, a drive motor, a reverse motor, a drive motor driver, and a reverse motor driver. The drive motor is connected to the drive motor driver, the reverse motor is connected to the reverse motor driver, and the driver switch S7 is connected to both the drive motor driver and the reverse motor driver.

[0014] Furthermore, the indicator circuit includes a start indicator LED8, a forward indicator LED7, a reverse indicator LED6, a right turn indicator LED5, a left turn indicator LED4, a custom indicator LED2, and a custom indicator LED1. The start indicator LED8, forward indicator LED7, reverse indicator LED6, right turn indicator LED5, left turn indicator LED4, custom indicator LED2, and custom indicator LED1 are all connected to the VCU controller.

[0015] Furthermore, the CAN level conversion circuit includes a CAN communication interface, resistors R11, R8, and R7, a CAN transceiver chip U4, current-limiting resistors R9 and R10, and a decoupling capacitor C18. The decoupling capacitor C18 is connected to pin 3 (VCC) of the CAN transceiver chip U4, resistor R10 is connected to pin 4 (R) of the CAN transceiver chip U4, current-limiting resistor R9 is connected to pin 1 (D) of the CAN transceiver chip U4, resistor R7 is connected to pin 5 (EN) of the CAN transceiver chip U4, resistor R5 is connected to pin 8 (RS) of the CAN transceiver chip U4, and resistor R11 is connected in parallel with the CAN communication interface and then in parallel with the CAN transceiver chip U4.

[0016] This invention has the following advantages: It can be used for circuit teaching and controller development in universities. It can also be provided for research applications. In university teaching, it is quick to learn, the program is developed in a graphical form, which is more easy to understand than code and the development process is easier. It also greatly helps teachers and students learn the overall development process of VCU controllers. In research applications, it simplifies the VCU circuit, saving costs and space. Attached Figure Description

[0017] Figure 1 This is a circuit diagram of the power control module of the present invention; Figure 2This is a power input circuit diagram for the present invention; Figure 3 This is a diagram of the first DC BUCK step-down circuit of the present invention; Figure 4 This is a diagram of the second DC BUCK step-down circuit of the present invention; Figure 5 This is a diagram of the third DC BUCK step-down circuit of the present invention; Figure 6 This is a diagram of the fourth DC BUCK step-down circuit of the present invention; Figure 7 This is a circuit diagram of the VCU controller of the present invention; Figure 8 This is a circuit diagram of the indicator light of the present invention; Figure 9 This is a circuit diagram of the motor driver of the present invention; Figure 10 This is a CAN level conversion circuit diagram of the present invention; Figure 11 This is the switching circuit diagram of the present invention. Detailed Implementation

[0018] This invention provides a development and verification circuit for a new energy vehicle VCU system, including a power control module, a controller module, and a multi-channel transformer conversion module. The multi-channel transformer conversion module includes a power input circuit and a DC BUCK step-down circuit. The control module includes a VCU controller, an indicator light circuit, a motor driver circuit, a CAN level conversion circuit, and a switch circuit. The indicator light circuit, motor driver circuit, CAN level conversion circuit, and switch circuit are all connected to the VCU controller. The power control module is connected to the power input circuit, and the DC BUCK step-down circuit is connected to the power input module.

[0019] See appendix Figure 1 When the 220V power supply is connected and the transformer outputs 24V, and the emergency stop switch is not pressed, the control circuit is powered on, and the sensor (PTS) starts monitoring. If the sensor detects a condition requiring the fan to run (such as a temperature rise), the fan power is turned on, and the fan starts working to dissipate heat or provide ventilation. Pressing the emergency stop switch cuts off the power supply to the control circuit, and the fan immediately stops running to ensure the safety of the equipment or personnel.

[0020] Example 1: The first DC BUCK step-down circuit converts the input 24V voltage to 12V voltage.

[0021] As attached Figure 2 Appendix Figure 3 The 220V AC input shown is converted to 24V by a 220V to 24V transformer before being input into the power input circuit.

[0022] When switch S1 in the power input circuit is closed, the switch is connected to fuse F1, and 24V DC power passes through fuse F1, which is connected to capacitor C4.

[0023] The switching transistor inside the switching regulator U4 switches at a certain frequency (PWM control). When the switching transistor is turned on, the input voltage supplies power to the load through the inductor L4, and the inductor current increases linearly to store energy. The inductor L4 is connected in parallel with the electrolytic capacitor C2, and the output of the inductor L4 charges the electrolytic capacitor C2.

[0024] When switch S1 is turned off, since the inductor current cannot change abruptly, inductor L4 will generate a reverse electromotive force with the polarity of negative on the left and positive on the right. At this time, inductor L4 and freewheeling diode D2 are connected to form a circuit, releasing energy to the load and keeping the load current continuous. At this time, electrolytic capacitor C2 also discharges to the load to maintain the output voltage stability.

[0025] The output voltage can be adjusted by controlling the on and off times (duty cycle) of the switching transistor. In an ideal situation, the output voltage of the Buck circuit is Vout = Vin * D, where D is the duty cycle. Here, 24V is converted to 12V, and the duty cycle is about 50%.

[0026] The electrolytic capacitor C2 and inductor L4 at the output end are connected in parallel to form an LC filter, which smooths the output voltage and reduces ripple.

[0027] The input capacitor C1 and electrolytic capacitor C2 are connected in parallel to filter out high-frequency noise from the input power supply, smooth the input voltage, store energy, and prevent voltage drops.

[0028] See appendix Figure 1 When the 220V power supply is connected and the transformer outputs 24V, and the emergency stop switch is not pressed, the control circuit is powered on, and the sensor (PTS) starts monitoring. If the sensor detects a condition requiring the fan to run (such as a temperature rise), the fan power is turned on, and the fan starts working to dissipate heat or provide ventilation. Pressing the emergency stop switch cuts off the power supply to the control circuit, and the fan immediately stops running to ensure the safety of the equipment or personnel.

[0029] Example 2: The second DC BUCK step-down circuit converts the input 24V voltage to 5V. As attached Figure 2 Appendix Figure 5 As shown, when switch S1 in the power input circuit is closed, switch S1 is connected to fuse F1, and 24V DC power passes through fuse F1, which is connected to capacitor C8.

[0030] When the high-side MOSFET inside the switching regulator U1 is turned on, the inductor L3 is connected to pin 4 fb of the switching regulator U1, and the current flows from +Vin through the inductor L3 to the output load. The inductor L3 stores energy, and the current increases linearly.

[0031] Turn-off phase: The high-side MOSFET is turned off, the current-limiting diode D3 and the inductor L3 are connected in parallel, and the inductor current continues to flow through the freewheeling diode D3, releasing energy, and the current decreases linearly.

[0032] Stable output voltage: The 4th pin (fb) of the switching regulator U1 with inductor L3 is connected, and the output voltage is output through the fb pin. The internal PWM controller of the switching regulator U1 adjusts the duty cycle of the switch to stabilize the output voltage at +5V.

[0033] The electrolytic capacitor C7 at the output terminal is connected in parallel with the inductor L3 to form an LC filter, which smooths the voltage and current and reduces ripple.

[0034] The input capacitor C5 and electrolytic capacitor C6 are connected in parallel to filter out high-frequency noise, smooth the input voltage, and reduce the voltage ripple at the input terminal.

[0035] See appendix Figure 1 When the 220V power supply is connected and the transformer outputs 24V, and the emergency stop switch is not pressed, the control circuit is energized, and the sensor (PTS) begins monitoring. If the sensor detects conditions requiring fan operation (such as temperature rise), the fan power is switched on, and the fan begins to work for heat dissipation or ventilation. Pressing the emergency stop switch cuts off the control circuit power, and the fan immediately stops running, ensuring equipment and personnel safety.

[0036] Example 3: The third DC BUCK step-down circuit converts the input 24V voltage to 3.3V. As attached Figure 2 Appendix Figure 5 As shown, when switch S1 in the power input circuit is closed, switch S1 is connected to fuse F1, and 24V DC power passes through fuse F1, which is connected to capacitor C13.

[0037] When the high-side MOSFET inside the switching regulator U2 is turned on, the inductor L2 is connected to pin 4 fb of the switching regulator U2, and the current flows from +Vin through the inductor L2 to the output load. The inductor L2 stores energy, and the current increases linearly.

[0038] Turn-off phase: When switch S1 is open, the inductor current cannot change abruptly. The positive terminal of the freewheeling diode D5 is connected in parallel with the inductor L2, forming a circuit through the freewheeling diode D5 to continue supplying power to the load.

[0039] Inductor and capacitor filtering: Inductor L2 and capacitor C12 are connected in parallel to form an LC filter. Inductor L2 smooths current fluctuations. Inductor L2 is connected to pin 4 fb of switching regulator U2 to further smooth the output voltage and reduce ripple.

[0040] Feedback regulation: The feedback network detects the output voltage and feeds it back to the controller.

[0041] Electrolytic capacitor C12 and capacitor C13 are connected in parallel at the output terminal to stabilize the output voltage, reduce ripple, and filter out high-frequency noise at the output terminal.

[0042] The input capacitor C9 and the electrolytic capacitor C10 are connected in parallel to filter out high-frequency noise on the input side, smooth the input voltage, and suppress voltage fluctuations.

[0043] The VCU controller adjusts the duty cycle of the switch based on the feedback voltage to maintain the output voltage stable at +3.3V.

[0044] The freewheeling diode D5 provides a freewheeling path for the inductor current when the switch is off, preventing high voltage spikes from being generated in the inductor and protecting the switching transistor.

[0045] See appendix Figure 1 When the 220V power supply is connected and the transformer outputs 24V, and the emergency stop switch is not pressed, the control circuit is energized, and the sensor (PTS) begins monitoring. If the sensor detects conditions requiring fan operation (such as temperature rise), the fan power is switched on, and the fan begins to work for heat dissipation or ventilation. Pressing the emergency stop switch cuts off the control circuit power, and the fan immediately stops running, ensuring equipment and personnel safety.

[0046] Example 4: The fourth DC BUCK step-down circuit converts the input 24V voltage into an adjustable voltage of 0-24V. As attached Figure 2 Appendix Figure 6 As shown, when switch S1 in the power input circuit is closed, switch S1 is connected to fuse F1, and 24V DC power passes through fuse F1, which is connected to capacitor C17.

[0047] When the high-side MOSFET inside the switching regulator U3 is turned on, the inductor L1 is connected to pin 4 fb of the switching regulator U3, and the current flows from +Vin through the inductor L1 to the output load. The inductor L1 stores energy, and the current increases linearly.

[0048] Turn-off phase: When switch S1 is open, the inductor current cannot change abruptly. The freewheeling diode D4 and the electrolytic capacitor C16 are connected in parallel, forming a circuit through the freewheeling diode D4 to continue supplying power to the load.

[0049] Inductor and capacitor filtering: Inductor L1 smooths current fluctuations. Inductor L and electrolytic capacitor C16 are connected in parallel to form an LC filter, which further smooths the output voltage and reduces ripple.

[0050] Electrolytic capacitor C16 and capacitor C17 are connected in parallel at the output terminal to stabilize the output voltage, reduce ripple, and filter out high-frequency noise at the output terminal.

[0051] Electrolytic capacitors C15 and C14 are connected in parallel at the input terminal to stabilize the input voltage, reduce ripple, and filter out high-frequency noise at the input terminal.

[0052] Feedback regulation: The feedback network ensures that the output voltage is stable within the set value of 0–24V adjustable. The feedback network detects the output voltage and feeds it back to the VCU controller.

[0053] The freewheeling diode D6 provides a freewheeling path for the inductor current when the switch is off, preventing high voltage spikes from being generated in the inductor and protecting the switching transistor.

[0054] Example 5 As attached Figure 7 As shown, the VCU controller can be directly connected to an industrial computer via USB. The industrial computer's USB port provides power to the VCU controller. The VCU controller's resource port connects to the control terminal of the actuator to control the actuator. The VCU controller can also output PWM wave signals, high and low level signals, and analog electrical signals.

[0055] Example 6 As attached Figure 11 Appendix Figure 7 As shown, when GPIO12 outputs a high level, resistor R9 is connected to pin 1 (D) of CAN transceiver chip U4, capacitor C18 is connected to pin 3 (VCC) of CAN transceiver chip U4, and the CAN transceiver chip controller module is connected. Current flows through resistor R9, CAN transceiver chip U4, and controller module in sequence. Capacitor C18 is used to filter out high-frequency noise on the control signal to avoid false triggering or flickering.

[0056] As attached Figure 7 Appendix Figure 9 As shown, the drive motor and the reverse motor are connected to the PWM signal output terminal of the VCU controller. The VCU controller outputs a PWM signal and controls the motor voltage by adjusting the duty cycle, thereby controlling the speed. The drive motor is responsible for the main power output, such as forward movement and acceleration. The reverse motor may be used for regenerative braking, auxiliary drive, or reverse traction (such as reversing and deceleration). The two can be controlled independently to achieve four-quadrant operation (forward rotation, reverse rotation, electric motor, and generator).

[0057] As attached Figure 11As shown, at this time, press the start switch S4. The start switch S4 is connected to the VCU controller, as shown in the attached diagram. Figure 8 As shown, the start indicator LED8 lights up, indicating that the machine has started working. Depending on the requirements, press different gear switches. Gear switch S5 is connected to the VCU control. When gear switch S5 is moved to forward gear R3, as shown in the attached diagram... Figure 8 As shown, the forward indicator LED7 is lit. When the gear switch S5 is moved to reverse R5, as shown in the attached diagram... Figure 8 As shown, the reverse indicator LED6 is lit, and the turn switch S6 is connected to the VCU controller. When the turn switch S6 is switched to the left turn switch R4, as shown in the attached diagram... Figure 8 As shown, the left turn indicator LED4 is lit. When the turn switch S6 is switched to the right turn switch R6, as shown in the attached diagram... Figure 8 As shown, the right turn indicator LED5 is lit, and the switch and indicator can be customized according to needs.

[0058] Although specific embodiments of the present invention have been described in detail with reference to the accompanying drawings, this should not be construed as limiting the scope of protection of the present invention. Various modifications and variations that can be made by those skilled in the art without inventive effort within the scope described in the claims are still within the scope of protection of the present invention.

Claims

1. A new energy vehicle VCU system development verification circuit, comprising a power supply control module, a controller module and a multi-channel transformer conversion module, characterized in that: The multi-path transformer conversion module comprises a power input circuit, a DC BUCK voltage reduction circuit, the control module comprises a VCU controller, an indicator light circuit, a motor driver circuit, a CAN level conversion circuit and a switch circuit, the indicator light circuit, the motor driver circuit, the CAN level conversion circuit and the switch circuit are connected with the VCU controller, the power control module is connected with the power input circuit, and the DC BUCK voltage reduction circuit is connected with the power input module. ​ 2. The new energy vehicle VCU system development verification circuit of claim 1, wherein: The DC BUCK voltage reduction circuit comprises a first DC BUCK voltage reduction circuit, a second DC BUCK voltage reduction circuit, a third DC BUCK voltage reduction circuit and a fourth DC BUCK voltage reduction circuit, the power input circuit comprises an anti-reverse connection protection diode D1, a switch S1 and a fuse F1, and the anti-reverse connection protection diode D1, the switch S1 and the fuse F1 are connected in series.

3. The development and verification circuit for a new energy vehicle VCU system as described in claim 2, characterized in that: The first DC BUCK voltage reduction circuit comprises a light-emitting diode LED1, a resistor R1, a capacitor C1, an electrolytic capacitor C3, a switching voltage stabilizer U4, an inductor L4, a freewheeling diode D2, an electrolytic capacitor C2 and a capacitor C4, the light-emitting diode LED1 is connected with the resistor R1 in series, the capacitor C1 and the electrolytic capacitor C3 are connected in parallel and connected with the input end +Vin of the switching voltage stabilizer, the capacitor C4, the electrolytic capacitor C2 and the freewheeling diode D2 are connected in parallel, then connected with the inductor L4 in series and connected with the output OUT of the switching voltage stabilizer, and the positive end of the electrolytic capacitor C2 is connected with the 4-pin fb of the switching voltage stabilizer.

4. The new energy vehicle VCU system development verification circuit of claim 2, wherein: The second DC BUCK voltage reduction circuit comprises a capacitor C5, an electrolytic capacitor C6, a switching voltage stabilizer U2, a freewheeling diode D3, an inductor L3, an electrolytic capacitor C7 and a capacitor C8, the capacitor C5 and the electrolytic capacitor C6 are connected in parallel and connected with the input end +Vin of the switching voltage stabilizer, the freewheeling diode D3, the electrolytic capacitor C and the capacitor C8 are connected in parallel, then connected with the inductor L3 in series and connected with the output end OUT of the switching voltage stabilizer U1, and the positive end of the electrolytic capacitor is connected with the 4-pin fb of the switching voltage stabilizer U1.

5. The new energy vehicle VCU system development verification circuit of claim 2, wherein: The third DC BUCK voltage reduction circuit comprises a capacitor C9, an electrolytic capacitor C10, a switching voltage stabilizer U2, a freewheeling diode D5, an inductor L2, an electrolytic capacitor C12 and a capacitor C13, the capacitor C9 and the electrolytic capacitor C10 are connected in parallel and connected with the input end +Vin of the switching voltage stabilizer U2, the capacitor C13, the electrolytic capacitor C12 and the freewheeling diode D5 are connected in parallel, then connected with the inductor L2 in series and connected with the output end OUT of the switching voltage stabilizer U2, and the positive end of the electrolytic capacitor C12 is connected with the 4-pin fb of the switching voltage stabilizer U2.

6. The new energy vehicle VCU system development verification circuit of claim 2, wherein: The fourth DC BUCK voltage reducing circuit includes capacitor C14, electrolytic capacitor C15, switching voltage regulator U3, freewheeling diode D4, inductor L1, electrolytic capacitor C16, resistor R2, capacitor C17, the capacitor C14 and the electrolytic capacitor C15 are connected with the input end +Vin of the switching voltage regulator U3 in parallel, the freewheeling diode D4, the electrolytic capacitor C16 and the capacitor C17 are connected in parallel, and then the inductor L2 is connected in series, and then the output end OUT of the switching voltage regulator U3 is connected, the positive end of the electrolytic capacitor C16 and the resistor R2 are connected with the 4-pin fb of the switching voltage regulator U3. 7.The new energy vehicle VCU system development verification circuit according to claim 1, wherein: The switching circuit includes potentiometer RP2, starting switch S4, gear switch S5, steering switch S6, switch S1, switch S2 and switch S3, the potentiometer RP2, the starting switch S4, the gear switch S5, the steering switch S6, the switch S1, the switch S2 and the switch S3 are connected with the VCU controller, the steering switch S5 includes forward gear R3 and reverse gear R5, and the steering switch S6 includes left turn switch R4 and right turn switch R6. 8.The new energy vehicle VCU system development verification circuit according to claim 1, wherein: The motor driver circuit includes driver switch S7, driving motor, reverse drag motor, driving motor driver and reverse drag motor driver, the driving motor is connected with the driving motor driver, the reverse drag motor is connected with the reverse drag motor driver, and the driver switch S7 is connected with the driving motor driver and the reverse drag motor driver. 9.The new energy vehicle VCU system development verification circuit according to claim 1, wherein: The indicator lamp circuit includes starting indicator lamp LED8, forward indicator lamp LED7, reverse indicator lamp LED6, right turn indicator lamp LED5, left turn indicator lamp LED4, self-defined indicator lamp LED2 and self-defined indicator lamp LED1, and the starting indicator lamp LED8, the forward indicator lamp LED7, the reverse indicator lamp LED6, the right turn indicator lamp LED5, the left turn indicator lamp LED4, the self-defined indicator lamp LED2 and the self-defined indicator lamp LED1 are connected with the VCU controller. 10.The new energy vehicle VCU system development verification circuit according to claim 1, wherein: The CAN level conversion circuit includes CAN communication interface, resistor R11, resistor R8, resistor R7, CAN transceiver chip U4, current limiting resistor R9, resistor R10 and decoupling capacitor C18, the decoupling capacitor C18 is connected with the 3-pin VCC of the CAN transceiver chip U4, the resistor R10 is connected with the 4-pin R of the CAN transceiver chip U4, the current limiting resistor R9 is connected with the 1-pin D of the CAN transceiver chip U4, the resistor R7 is connected with the 5-pin EN of the CAN transceiver chip U4, the resistor R5 is connected with the 8-pin RS of the CAN transceiver chip U4, and the resistor R11 is connected with the CAN communication interface in parallel and connected with the CAN transceiver chip U4 in parallel.

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