Auxiliary anti-theft system of electric vehicle

Abstract

An auxiliary anti-theft system of an electric vehicle comprises an anti-theft system, the anti-theft system is provided with a motor controller and a PKE controller, and the auxiliary anti-theft system is characterized in that the motor controller and the PKE controller are in bidirectional connection, and the motor controller is connected with a motor; after parking and flameout, the PKE controller sends an anti-theft enabling instruction to the motor controller, the motor controller or the PKE controller collects an anti-theft voltage signal on a motor in real time and compares the anti-theft voltage signal with an alarm voltage threshold value, when the anti-theft voltage signal is larger than the alarm voltage threshold value, the anti-theft function is triggered, and the motor controller or the PKE controller sends the anti-theft enabling instruction to the motor controller. The motor controller outputs a zero-rotating-speed or locked-rotor control pulse to the motor, and the motor enters a zero-rotating-speed or locked-rotor mode; meanwhile, the PKE controller controls a vehicle sound-light alarm device to give an alarm. The system has the advantages that on the premise that system cost is not increased, the auxiliary anti-theft function of the vehicle is achieved through software and hardware matching of all system parts of the whole vehicle, and the anti-theft safety of the whole vehicle is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle anti-theft, in particular to an auxiliary anti-theft system for electric vehicles. Background Art

[0002] Motorcycles, as a common type of vehicle, have become an essential means of transportation for many people due to their convenience and efficiency. However, the growing number of motorcycles has also led to an increase in motorcycle thefts. Statistics show that hundreds of thousands of motorcycles are stolen worldwide each year, causing significant damage to public security and personal property. Therefore, effectively preventing motorcycle theft has become a key issue that motorcycle owners and management authorities must address.

[0003] Conventional electric motorcycle anti-theft systems are based on mechanical locking of the steering mechanism and PKE power start-up control. In this anti-theft mode, the vehicle can still be pushed and driven, posing a risk of vehicle theft.

[0004] Disadvantages of existing technology: The mechanical locking anti-theft and PKE power start-up control anti-theft methods adopted by the existing electric motorcycle anti-theft system have low anti-theft security and pose a risk of vehicle theft. Utility Model Content

[0005] The utility model provides an auxiliary anti-theft system for an electric vehicle, which can improve the anti-theft safety of the entire vehicle.

[0006] To achieve the above-mentioned object, the utility model provides an auxiliary anti-theft system for an electric vehicle, including an anti-theft system, wherein the anti-theft system is provided with a motor controller and a PKE controller, wherein the key features are: the motor controller and the PKE controller are bidirectionally connected, and the motor controller is connected to a motor;

[0007] After the vehicle is parked and the engine is turned off, the PKE controller sends an anti-theft enable instruction to the motor controller. The motor controller or PKE controller collects the anti-theft voltage signal on the motor in real time and compares the anti-theft voltage signal with the alarm voltage threshold. When the anti-theft voltage signal is greater than the alarm voltage threshold, the anti-theft function is triggered, and the motor controller outputs a zero-speed or stall control pulse to the motor, and the motor enters zero-speed or stall mode. At the same time, the PKE controller controls the vehicle's sound and light alarm device to sound an alarm.

[0008] Through the above design, when the vehicle is in the power-off anti-theft state and the motor rotates passively, according to the characteristics of the permanent magnet synchronous motor, the three-phase lines (U, V, W) will generate a voltage signal under the action of the permanent magnet magnetic field. By collecting the voltage signal in real time and comparing the voltage signal with the alarm voltage threshold calibrated by the software, it is determined whether the vehicle is in an illegal pushing state; when it is detected that the vehicle is in an illegal pushing state, the anti-theft auxiliary function is triggered, the system wakes up, and the motor controller controls the motor to zero speed or stall; at the same time, the anti-theft enable instruction triggers the PKE controller to control the vehicle's sound and light alarm function to be turned on, thereby realizing vehicle anti-theft and forced pushing.

[0009] The PKE controller is a power anti-theft system. When the system anti-theft function is turned on, the vehicle cannot be powered on. Otherwise, the vehicle can be powered on normally.

[0010] Anti-theft voltage collection is not limited to motor controllers or PKE controllers. Any unit in the vehicle that can realize motor phase voltage collection can be applied. Anti-theft voltage collection is not limited to the voltage of a certain phase among the three phases of the drive motor. Multi-phase voltage collection can be redundantly compared to improve system sensitivity and reliability.

[0011] Preferably, the motor controller is provided with an MCU microprocessor and a three-phase full-bridge circuit, and the MCU microprocessor drives the motor to work via the three-phase full-bridge circuit;

[0012] The three-phase full-bridge circuit is provided with a first MOS transistor Q1, a second MOS transistor Q2, a third MOS transistor Q3, a fourth MOS transistor Q4, a fifth MOS transistor Q5 and a sixth MOS transistor Q6;

[0013] The first driving terminal DR1 of the MCU microprocessor is connected to the gate of the first MOS transistor Q1, the drain of the first MOS transistor Q1 is connected to the positive power supply, the source of the first MOS transistor Q1 is connected to the U-phase voltage driving terminal of the motor, and the source of the first MOS transistor Q1 is also connected to the drain of the second MOS transistor Q2; the gate of the second MOS transistor Q2 is connected to the second driving terminal DR2 of the MCU microprocessor, and the source of the second MOS transistor Q2 is connected to the negative power supply;

[0014] The third driving terminal DR3 of the MCU microprocessor is connected to the gate of the third MOS transistor Q3, the drain of the third MOS transistor Q3 is connected to the positive power supply, the source of the third MOS transistor Q3 is connected to the V-phase voltage driving terminal of the motor, and the source of the third MOS transistor Q3 is also connected to the drain of the fourth MOS transistor Q4; the gate of the fourth MOS transistor Q4 is connected to the fourth driving terminal DR4 of the MCU microprocessor, and the source of the fourth MOS transistor Q4 is connected to the negative power supply;

[0015] The fifth driving terminal DR5 of the MCU microprocessor is connected to the gate of the fifth MOS transistor Q5, the drain of the fifth MOS transistor Q5 is connected to the positive power supply, the source of the fifth MOS transistor Q5 is connected to the W-phase voltage driving terminal of the motor, and the source of the fifth MOS transistor Q5 is also connected to the drain of the sixth MOS transistor Q6; the gate of the sixth MOS transistor Q6 is connected to the sixth driving terminal DR6 of the MCU microprocessor, and the source of the sixth MOS transistor Q6 is connected to the negative power supply.

[0016] Preferably, a capacitor C1 is connected in parallel between the positive power supply and the negative power supply.

[0017] Preferably, the anti-theft system is a high-low voltage isolation system, the motor controller is further provided with an optocoupler isolation circuit, and the MCU microprocessor collects the driving voltage of any phase of the motor via the optocoupler isolation circuit.

[0018] Preferably, the optocoupler isolation circuit is provided with a photoelectric coupler, the anti-theft acquisition terminal group of the MCU microprocessor is correspondingly connected to the input terminal group of the photoelectric coupler, the positive output terminal of the photoelectric coupler is connected in series with a resistor R1 and then connected to any phase voltage drive terminal of the motor, the positive output terminal of the photoelectric coupler is also connected to the cathode of the Zener diode D1, and the anode of the Zener diode D1 is connected to the negative power supply; the negative output terminal of the photoelectric coupler is connected to the negative power supply.

[0019] Preferably, a power supply device is provided, which includes a first battery pack and a DCDC module. The first battery pack and the DCDC module are bidirectionally connected. The DCDC module provides a 12V power supply for the motor controller and the PKE controller. The first battery pack provides a power supply for the motor controller.

[0020] The high-low voltage isolation system uses low voltage to control high voltage on-off. Its low voltage power supply is a 12V power supply. The DC-DC module converts the power of the first battery pack into 12V to charge the 12V power supply. The 12V power supply is connected in parallel with the working power supply of each system component. The power of the first battery pack is supplied to the motor controller through the DC bus. The motor controller controls the three-phase full-bridge circuit to achieve inversion and drive the motor output. During energy recovery, the motor controller controls the three-phase full-bridge circuit to achieve rectification and charges the first battery pack through the DC bus.

[0021] The PKE controller sends the anti-theft enable status to the motor controller. When the anti-theft function is triggered, the motor controller feeds back the anti-theft enable instruction to the PKE controller. The motor controller detects the anti-theft voltage signal and compares it with the system-calibrated alarm voltage threshold U1. When it is less than U1, the anti-theft function is not triggered. When it is greater than U1, the anti-theft function is triggered.

[0022] Preferably, the anti-theft system is a high-low voltage non-isolated system, which is provided with a PKE anti-theft acquisition circuit, and the PKE controller acquires the driving voltage of any phase of the motor via the PKE anti-theft acquisition circuit.

[0023] Preferably, the PKE anti-theft acquisition circuit is provided with a capacitor C2, the front end of the capacitor C2 is connected to the PKE controller, the rear end is connected in series with a resistor R2 and then connected to any phase voltage drive end of the motor, the rear end of the capacitor C2 is also connected in series with a resistor R2 and then connected to a negative power supply, the rear end of the capacitor C2 is also connected to the cathode of the Zener diode D2, and the anode of the Zener diode D2 is connected to the negative power supply.

[0024] Preferably, a second battery pack is provided to supply power to the motor controller and the PKE controller.

[0025] In the high and low voltage non-isolated system, the power of the second battery pack is supplied to the PKE controller; the PKE controller detects the anti-theft voltage signal and compares it with the alarm voltage threshold U1 calibrated by the system. When the voltage is less than U1, the anti-theft function is not triggered; when the voltage is greater than U1, the anti-theft function is triggered;

[0026] When the anti-theft function is triggered, the PKE controller supplies power to the motor controller and at the same time sends the anti-theft enable status to the motor controller; the power electricity of the second battery pack is supplied to the motor controller through the DC bus, and the motor controller realizes inversion by controlling the three-phase full-bridge circuit and drives the motor output; during energy recovery, the motor controller realizes rectification by controlling the three-phase full-bridge circuit and charges the power electricity to the second battery pack through the DC bus.

[0027] Preferably, the motor is a permanent magnet synchronous motor.

[0028] Beneficial effects of the utility model:

[0029] 1. Without increasing system costs, by matching the hardware and software of each system component of the vehicle, the vehicle auxiliary anti-theft function is realized, thereby improving the anti-theft security of the entire vehicle;

[0030] 2. Based on the current electric motorcycle isolation and non-isolation electrical system solutions, both can be applied and adapted, and can be expanded to a wide range of applications;

[0031] 3. Based on the vehicle's networking module, the anti-theft function trigger status can be pushed to the user's mobile phone, so that the user is aware of the anti-theft risk of the vehicle and can check it in time, improving user experience and vehicle safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a structural block diagram of the high and low voltage isolation system in Example 1;

[0033] Figure 2This is a circuit diagram of the high and low voltage isolation system in Example 1;

[0034] Figure 3 This is a control flow chart of the high and low voltage isolation system in Example 1;

[0035] Figure 4 This is a structural block diagram of the high and low voltage non-isolated system in Example 2;

[0036] Figure 5 This is the circuit diagram of the high and low voltage non-isolated system in Example 2;

[0037] Figure 6 This is a control flow chart of the high and low voltage non-isolated system in Example 2. DETAILED DESCRIPTION

[0038] The present invention will be further described in detail below with reference to the accompanying drawings and specific examples. The following examples or drawings are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0039] Example 1:

[0040] like Figure 1 As shown: An auxiliary anti-theft system for an electric vehicle, including a high-low voltage isolation system, the high-low voltage isolation system is provided with a motor controller and a PKE controller, the motor controller and the PKE controller are bidirectionally connected, and the motor controller is connected to a motor;

[0041] The motor controller is provided with an MCU microprocessor and a three-phase full-bridge circuit, and the MCU microprocessor drives the motor to work via the three-phase full-bridge circuit;

[0042] The motor controller is further provided with an optocoupler isolation circuit, and the MCU microprocessor collects the U-phase drive voltage of the motor via the optocoupler isolation circuit.

[0043] The high and low voltage isolation system is also provided with a power supply device, which is provided with a first battery pack and a DCDC module. The first battery pack and the DCDC module are bidirectionally connected. The DCDC module provides a 12V power supply for the motor controller and the PKE controller, and the first battery pack provides a power supply for the motor controller.

[0044] like Figure 2 As shown: the three-phase full-bridge circuit is provided with a first MOS transistor Q1, a second MOS transistor Q2, a third MOS transistor Q3, a fourth MOS transistor Q4, a fifth MOS transistor Q5 and a sixth MOS transistor Q6;

[0045] The first driving terminal DR1 of the MCU microprocessor is connected to the gate of the first MOS transistor Q1, the drain of the first MOS transistor Q1 is connected to the positive power supply, the source of the first MOS transistor Q1 is connected to the U-phase voltage driving terminal of the motor, and the source of the first MOS transistor Q1 is also connected to the drain of the second MOS transistor Q2; the gate of the second MOS transistor Q2 is connected to the second driving terminal DR2 of the MCU microprocessor, and the source of the second MOS transistor Q2 is connected to the negative power supply;

[0046] The third driving terminal DR3 of the MCU microprocessor is connected to the gate of the third MOS transistor Q3, the drain of the third MOS transistor Q3 is connected to the positive power supply, the source of the third MOS transistor Q3 is connected to the V-phase voltage driving terminal of the motor, and the source of the third MOS transistor Q3 is also connected to the drain of the fourth MOS transistor Q4; the gate of the fourth MOS transistor Q4 is connected to the fourth driving terminal DR4 of the MCU microprocessor, and the source of the fourth MOS transistor Q4 is connected to the negative power supply;

[0047] The fifth driving terminal DR5 of the MCU microprocessor is connected to the gate of the fifth MOS transistor Q5, the drain of the fifth MOS transistor Q5 is connected to the positive power supply, the source of the fifth MOS transistor Q5 is connected to the W-phase voltage driving terminal of the motor, and the source of the fifth MOS transistor Q5 is also connected to the drain of the sixth MOS transistor Q6; the gate of the sixth MOS transistor Q6 is connected to the sixth driving terminal DR6 of the MCU microprocessor, and the source of the sixth MOS transistor Q6 is connected to the negative power supply.

[0048] A capacitor C1 is connected in parallel between the positive power supply and the negative power supply.

[0049] The optocoupler isolation circuit is provided with a photoelectric coupler, and the anti-theft acquisition terminal group of the MCU microprocessor is correspondingly connected to the input terminal group of the photoelectric coupler. The positive output terminal of the photoelectric coupler is connected in series with a resistor R1 and then connected to the U-phase voltage drive terminal of the motor. The positive output terminal of the photoelectric coupler is also connected to the cathode of the Zener diode D1, and the anode of the Zener diode D1 is connected to the negative power supply; the negative output terminal of the photoelectric coupler is connected to the negative power supply.

[0050] like Figure 3 As shown: The control logic of the high and low voltage isolation system is as follows:

[0051] S1: When the vehicle enters the anti-theft mode, all system components are in a dormant state, the PKE anti-theft mode is turned on, the motor controller stores the anti-theft enable command from the PKE controller, and enters the anti-theft monitoring mode;

[0052] S2: The motor controller enters a low-power state through power supply, collects anti-theft voltage signals in real time, and compares them with the anti-theft alarm voltage threshold U1. When the collected anti-theft voltage signal is greater than the anti-theft alarm voltage threshold U1, the system enters a fully awake working state;

[0053] S3: When the system is awakened by the anti-theft function of the motor controller, the first battery pack provides power, and the motor controller uses the power and a preset software algorithm to control the motor to enter zero speed mode or locked rotor mode. At the same time, the anti-theft enable command is fed back to the PKE controller, which controls the vehicle's sound and light alarm devices to turn on.

[0054] S4: When the motor controller controls the motor to enter zero speed mode or locked rotor mode, the motor controller starts timing. When the time is greater than the software preset time T1, it monitors and determines whether the anti-theft voltage signal is greater than the alarm voltage threshold U1. If it is less than U1, the anti-theft enable instruction fed back to the PKE controller is canceled, and each system enters a dormant low-power state, and the motor controller enters the anti-theft monitoring mode. If it is greater than U1, the motor is controlled to enter zero speed mode or locked rotor mode, and the timing is restarted.

[0055] S5: When the second timing duration is longer than the software preset duration T2, monitor and judge whether the anti-theft voltage signal is greater than the alarm voltage threshold U1; if it is less than U1, cancel the anti-theft enable instruction fed back to the PKE controller, each system enters the dormant low-power state, and the motor controller enters the anti-theft monitoring mode; if it is greater than U1, control the motor to enter zero speed mode or stall mode, and restart timing; repeat S4 until exiting the anti-theft control and entering the anti-theft monitoring mode.

[0056] The alarm voltage threshold U1 is set according to the physical characteristics of the motor's back electromotive force and the anti-theft control vehicle speed calibration, and the time thresholds T1 and T2 are set according to system calibration and working condition experience.

[0057] In Example 1, the motor is a permanent magnet synchronous motor, the alarm voltage threshold U1 is 0.6V, and the time thresholds T1 and T2 are 15S and 30S respectively.

[0058] Example 2:

[0059] like Figure 4 As shown: an auxiliary anti-theft system for an electric vehicle, including a high-low non-voltage isolation system, the high-low voltage non-isolation system is provided with a motor controller and a PKE controller, the motor controller and the PKE controller are bidirectionally connected, and the motor controller is connected to a motor;

[0060] The motor controller is provided with an MCU microprocessor and a three-phase full-bridge circuit, and the MCU microprocessor drives the motor to work via the three-phase full-bridge circuit;

[0061] The high and low voltage non-isolated system is further provided with a PKE anti-theft acquisition circuit, and the PKE controller acquires the U-phase drive voltage of the motor via the PKE anti-theft acquisition circuit.

[0062] The high and low voltage non-isolated system is further provided with a second battery pack, which supplies power to the motor controller and the PKE controller.

[0063] like Figure 5 As shown: the three-phase full-bridge circuit is provided with a first MOS transistor Q1, a second MOS transistor Q2, a third MOS transistor Q3, a fourth MOS transistor Q4, a fifth MOS transistor Q5 and a sixth MOS transistor Q6;

[0064] The first driving terminal DR1 of the MCU microprocessor is connected to the gate of the first MOS transistor Q1, the drain of the first MOS transistor Q1 is connected to the positive power supply, the source of the first MOS transistor Q1 is connected to the U-phase voltage driving terminal of the motor, and the source of the first MOS transistor Q1 is also connected to the drain of the second MOS transistor Q2; the gate of the second MOS transistor Q2 is connected to the second driving terminal DR2 of the MCU microprocessor, and the source of the second MOS transistor Q2 is connected to the negative power supply;

[0065] The third driving terminal DR3 of the MCU microprocessor is connected to the gate of the third MOS transistor Q3, the drain of the third MOS transistor Q3 is connected to the positive power supply, the source of the third MOS transistor Q3 is connected to the V-phase voltage driving terminal of the motor, and the source of the third MOS transistor Q3 is also connected to the drain of the fourth MOS transistor Q4; the gate of the fourth MOS transistor Q4 is connected to the fourth driving terminal DR4 of the MCU microprocessor, and the source of the fourth MOS transistor Q4 is connected to the negative power supply;

[0066] The fifth driving terminal DR5 of the MCU microprocessor is connected to the gate of the fifth MOS transistor Q5, the drain of the fifth MOS transistor Q5 is connected to the positive power supply, the source of the fifth MOS transistor Q5 is connected to the W-phase voltage driving terminal of the motor, and the source of the fifth MOS transistor Q5 is also connected to the drain of the sixth MOS transistor Q6; the gate of the sixth MOS transistor Q6 is connected to the sixth driving terminal DR6 of the MCU microprocessor, and the source of the sixth MOS transistor Q6 is connected to the negative power supply.

[0067] A capacitor C1 is connected in parallel between the positive power supply and the negative power supply.

[0068] The PKE anti-theft acquisition circuit is provided with a capacitor C2, the front end of the capacitor C2 is connected to the PKE controller, the rear end is connected in series with a resistor R2 and then connected to the U-phase voltage drive end of the motor, the rear end of the capacitor C2 is also connected in series with a resistor R2 and then connected to a negative power supply, the rear end of the capacitor C2 is also connected to the cathode of the Zener diode D2, and the anode of the Zener diode D2 is connected to the negative power supply.

[0069] like Figure 6 As shown: The control logic of the high and low voltage non-isolated system is as follows:

[0070] S1: When the vehicle enters the anti-theft mode, all system components are in dormant state, the PKE anti-theft mode is turned on, the PKE controller enters low power state through power supply, and enters the anti-theft monitoring mode;

[0071] S2: The PKE controller collects the anti-theft voltage signal in real time and compares it with the anti-theft alarm voltage threshold U1. When it is greater than U1, the system enters the fully awakened working state and the PKE controller controls the vehicle's sound and light alarm devices to turn on;

[0072] S3: When the system is awakened by the anti-theft function of the PKE controller, the PKE controller supplies power to the motor controller, sends the anti-theft function to the motor controller, and starts timing. The second battery pack provides power, and the motor controller uses the power and a preset software algorithm to control the motor to enter zero speed mode or locked rotor mode.

[0073] S4: When the timing duration of the PKE controller is greater than the software preset duration T1, it monitors and determines whether the anti-theft voltage signal is greater than the alarm voltage threshold U1; if it is less than U1, the anti-theft enable instruction is canceled, power is supplied to the motor controller, each system enters a dormant low-power state, and the PKE controller enters the anti-theft monitoring mode; if it is greater than U1, the state is maintained, the motor controller controls the motor to enter zero speed mode or stall mode, and the PKE controller restarts timing;

[0074] S5: When the second timing duration is longer than the software preset duration T2, monitor and judge whether the anti-theft voltage signal is greater than the alarm voltage threshold U1; if it is less than U1, cancel the anti-theft enable instruction, supply power to the motor controller, each system enters the dormant low-power state, and the PKE controller enters the anti-theft monitoring mode; if it is greater than U1, maintain the state, the motor controller controls the motor to enter the zero speed mode or the stall mode, and the PKE controller restarts timing; repeat S4 until the anti-theft control is exited and the anti-theft monitoring mode is entered.

[0075] In Example 2, the motor is a permanent magnet synchronous motor, the alarm voltage threshold U1 is 0.6V, and the time thresholds T1 and T2 are 15S and 30S respectively.

[0076] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An auxiliary anti-theft system for an electric vehicle, comprising an anti-theft system, the anti-theft system being provided with a motor controller and a PKE controller, characterized in that: The motor controller and the PKE controller are bidirectionally connected, and the motor controller is connected to a motor; The motor controller or PKE controller collects the anti-theft voltage signal on the motor in real time and compares the anti-theft voltage signal with the alarm voltage threshold. When the anti-theft voltage signal is greater than the alarm voltage threshold, the motor controller outputs a zero speed or stall control pulse to the motor; at the same time, the PKE controller controls the vehicle sound and light alarm device to alarm.

2. The auxiliary anti-theft system for electric vehicles according to claim 1, characterized in that: The motor controller is provided with an MCU microprocessor and a three-phase full-bridge circuit, and the MCU microprocessor drives the motor to work via the three-phase full-bridge circuit; The three-phase full-bridge circuit is provided with a first MOS transistor Q1, a second MOS transistor Q2, a third MOS transistor Q3, a fourth MOS transistor Q4, a fifth MOS transistor Q5 and a sixth MOS transistor Q6; The first driving terminal DR1 of the MCU microprocessor is connected to the gate of the first MOS transistor Q1, the drain of the first MOS transistor Q1 is connected to the positive power supply, the source of the first MOS transistor Q1 is connected to the U-phase voltage driving terminal of the motor, and the source of the first MOS transistor Q1 is also connected to the drain of the second MOS transistor Q2; the gate of the second MOS transistor Q2 is connected to the second driving terminal DR2 of the MCU microprocessor, and the source of the second MOS transistor Q2 is connected to the negative power supply; The third driving terminal DR3 of the MCU microprocessor is connected to the gate of the third MOS transistor Q3, the drain of the third MOS transistor Q3 is connected to the positive power supply, the source of the third MOS transistor Q3 is connected to the V-phase voltage driving terminal of the motor, and the source of the third MOS transistor Q3 is also connected to the drain of the fourth MOS transistor Q4; the gate of the fourth MOS transistor Q4 is connected to the fourth driving terminal DR4 of the MCU microprocessor, and the source of the fourth MOS transistor Q4 is connected to the negative power supply; The fifth driving terminal DR5 of the MCU microprocessor is connected to the gate of the fifth MOS transistor Q5, the drain of the fifth MOS transistor Q5 is connected to the positive power supply, the source of the fifth MOS transistor Q5 is connected to the W-phase voltage driving terminal of the motor, and the source of the fifth MOS transistor Q5 is also connected to the drain of the sixth MOS transistor Q6; the gate of the sixth MOS transistor Q6 is connected to the sixth driving terminal DR6 of the MCU microprocessor, and the source of the sixth MOS transistor Q6 is connected to the negative power supply.

3. The auxiliary anti-theft system for electric vehicles according to claim 2, characterized in that: A capacitor C1 is connected in parallel between the positive power supply and the negative power supply.

4. The auxiliary anti-theft system for electric vehicles according to claim 2, characterized in that: The anti-theft system is a high-low voltage isolation system, and the motor controller is further provided with an optocoupler isolation circuit. The MCU microprocessor collects the driving voltage of any phase of the motor via the optocoupler isolation circuit.

5. The auxiliary anti-theft system for electric vehicles according to claim 4, characterized in that: The optocoupler isolation circuit is provided with a photoelectric coupler, and the anti-theft acquisition terminal group of the MCU microprocessor is correspondingly connected to the input terminal group of the photoelectric coupler. The positive output terminal of the photoelectric coupler is connected in series with a resistor R1 and then connected to any phase voltage drive terminal of the motor. The positive output terminal of the photoelectric coupler is also connected to the cathode of the Zener diode D1, and the anode of the Zener diode D1 is connected to the negative power supply; the negative output terminal of the photoelectric coupler is connected to the negative power supply.

6. The auxiliary anti-theft system for electric vehicles according to claim 4, characterized in that: A power supply device is also provided, which is provided with a first battery pack and a DCDC module. The first battery pack and the DCDC module are bidirectionally connected. The DCDC module provides 12V power for the motor controller and the PKE controller, and the first battery pack provides power for the motor controller.

7. The auxiliary anti-theft system for electric vehicles according to claim 2, characterized in that: The anti-theft system is a high-low voltage non-isolated system, which is provided with a PKE anti-theft acquisition circuit. The PKE controller acquires any phase drive voltage of the motor through the PKE anti-theft acquisition circuit.

8. The auxiliary anti-theft system for electric vehicles according to claim 7, characterized in that: The PKE anti-theft acquisition circuit is provided with a capacitor C2, the front end of the capacitor C2 is connected to the PKE controller, the rear end is connected in series with a resistor R2 and then connected to any phase voltage drive end of the motor, the rear end of the capacitor C2 is also connected in series with a resistor R2 and then connected to a negative power supply, the rear end of the capacitor C2 is also connected to the cathode of the Zener diode D2, and the anode of the Zener diode D2 is connected to the negative power supply.

9. The auxiliary anti-theft system for electric vehicles according to claim 7, characterized in that: A second battery pack is also provided, which supplies power to the motor controller and the PKE controller.

10. The auxiliary anti-theft system for electric vehicles according to claim 1, characterized in that: The motor is a permanent magnet synchronous motor.

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