Integrated Method for Motor Drive and Lithium Battery Charging of Hybrid Electric Vehicles

Abstract

The present invention provides an integrated method for motor drive and lithium battery charging of a hybrid vehicle, which is implemented by using an integrated device for motor drive and lithium battery charging composed of a control system, a motor drive subsystem, and a lithium battery charging subsystem. The motor drive subsystem converts the direct current output by the hydrogen fuel cell system, or the direct current output by the lithium battery, or the direct current output by mixing the two into adjustable alternating current to drive a permanent magnet synchronous motor, and drives the vehicle connected to the permanent magnet synchronous motor to operate; the lithium battery charging subsystem rectifies the alternating current into adjustable direct current or uses the direct current output by the hydrogen fuel cell system to charge the lithium battery; the main controller in the control system controls the two subsystems through a coordinated control strategy to achieve safe and efficient operation of permanent magnet synchronous motor drive and lithium battery charging. The present invention can be applied to hydrogen fuel cell-lithium battery hybrid vehicles.

Description

Technical Field

[0001] The present invention belongs to the technical field of motor drive and power battery charging, and particularly relates to an integrated method for motor drive and lithium battery charging of a hybrid vehicle. Background Art

[0002] At present, with the growth of the global number of automobiles, the pollution caused by urban vehicle emissions is becoming increasingly serious, and the contradiction between supply and demand of traditional automotive fuels is also more prominent. Hydrogen fuel cell-lithium battery hybrid vehicles are a type of electric vehicle, known as the ultimate environmentally friendly vehicles in the industry. With the popularization of hydrogen fuel cell-lithium battery hybrid vehicles, the problem of difficult charging of electric vehicles has become increasingly prominent, and the lithium battery charging system and the motor drive system are independent of each other. The two systems each have their own main control chips, working circuits, controller housings, wiring harnesses, etc. The manufacturing costs of both are relatively high, and separate installations will cause waste of space.

[0003] A charging system using a motor drive system proposed in Chinese patent document "201910590360.4" integrates an external three-phase AC charging system on the motor drive system, replacing the original charging system, saving installation space and reducing manufacturing costs. Chinese patent document "202010511679.6" proposes a controller for both battery charging and motor drive, which integrates a motor controller and a battery charger and has the functions of charging the battery, obtaining energy from the battery, and controlling the motor. However, the above patents cannot achieve the control of the drive of hybrid vehicles, nor can they achieve the function of charging the hydrogen fuel cell when the motor is running and stopped, resulting in waste of hydrogen fuel cell energy.

[0004] Considering the above problems, an integrated method for motor drive and lithium battery charging of a hybrid vehicle is proposed. Summary of the Invention

[0005] The technical problem to be solved by the present invention is: aiming at the technical problems existing in the prior art, to provide an integrated method for motor drive and lithium battery charging of a hybrid vehicle, which integrates the functions of "motor drive and lithium battery charging", realizes the integration of motor drive and lithium battery charging of a hydrogen fuel cell-lithium battery hybrid vehicle, and ensures the safe and efficient operation of permanent magnet synchronous motor drive and lithium battery charging.

[0006] To solve the above technical problems, the technical solution proposed by the present invention is:

[0007] In a first aspect, an embodiment of the present invention provides an integrated method for motor drive and lithium battery charging of a hybrid vehicle, the method comprising: a motor drive subsystem realizes the drive of a permanent magnet synchronous motor, and a lithium battery charging subsystem realizes the charging of a lithium battery;

[0008] (1) Motor drive subsystem: The motor drive subsystem consists of a hydrogen fuel cell system, a lithium battery, a main circuit, a motor drive control module in the control system, a permanent magnet synchronous motor, a first switch and a second switch, a second contactor, a first DC interface, a second DC interface, and an AC output interface; the hydrogen fuel cell system consists of a hydrogen fuel cell stack and a DC / DC converter. The driving method for the permanent magnet synchronous motor is as follows:

[0009] First, the acceleration of the foot pedal and the operating conditions of the vehicle are collected in real time, and one of the three power supply methods, namely "hydrogen fuel cell power supply, lithium battery power supply, hybrid power supply", is selected as the DC power supply for the motor drive subsystem; when "hydrogen fuel cell power supply" is selected for operation, the first switch is closed, the second switch is opened, the first contactor is opened, and the second contactor is closed; when "lithium battery power supply" is selected for operation, the first switch is opened, the second switch is closed, the first contactor is opened, and the second contactor is closed; when "hybrid power supply" is required for operation, both the first switch and the second switch are closed, the second contactor is closed, and the first contactor is opened; when parking is required, the first switch, the second switch, the first contactor, and the second contactor are all opened;

[0010] Then, under the action of the DC power supply of the motor drive subsystem, the system composed of the main circuit, the motor drive control module in the control system, and the permanent magnet synchronous motor converts the direct current into adjustable alternating current according to the command of the main controller to drive the permanent magnet synchronous motor, driving the vehicle connected to the permanent magnet synchronous motor.

[0011] (2) Lithium battery charging subsystem: The lithium battery charging subsystem consists of a three-phase AC power supply, an AC input interface, a hydrogen fuel cell system, a main circuit, a charging control module in the control system, a first contactor, a first switch, and a second switch. The method for charging the lithium battery is as follows:

[0012] AC power supply charging: When the vehicle stops running and the battery level of the lithium battery is lower than the threshold, the system composed of the three-phase AC power supply, the AC input interface, the main circuit, the charging control module in the control system, the first contactor, and the second switch realizes the intelligent charging of the lithium battery;

[0013] During the operation of the vehicle, when the voltage of the direct current output by the hydrogen fuel cell system is higher than the voltage of the lithium battery and the battery level of the lithium battery is lower than the threshold, the system composed of the hydrogen fuel cell system, the first switch and the second switch, and the charging module in the control system realizes the intelligent charging of the lithium battery;

[0014] During the operation of the vehicle, when the vehicle brakes and energy feedback is required and the battery level of the lithium battery is lower than the threshold, the system composed of the permanent magnet synchronous motor, the second contactor, the main circuit, the second switch, and the charging module in the control system realizes the intelligent charging of the lithium battery;

[0015] The coordinated control between the permanent magnet synchronous motor driving method and the lithium battery charging method is realized by the main controller in the control system; the permanent magnet synchronous motor driving and lithium battery charging operation of the hybrid vehicle are realized through the above steps.

[0016] Furthermore, the control system is composed of a main controller, a motor drive control module, a charging control module, and other modules, which are integrated on a PCB board. The control system is provided with 4 CPUs, which correspond to the main controller, the motor drive control module, the charging control module, and other modules respectively.

[0017] Furthermore, the other modules include a processing module, a communication module, a fault module and an I / O module. The processing module is used to quantify and filter the pedal acceleration and the operating condition information of the vehicle, and the processed signals are used by the main controller; the communication module is a tool for the main controller to communicate with the outside world, and is used to receive external signals and report the status of the lithium battery and the main controller to the outside world; the fault module is used to detect possible faults in real time, take remedial measures, and notify the user; the first switch and the second switch, and the on and off of the first contactor and the second contactor are realized by the I / O module.

[0018] Furthermore, the motor drive and lithium battery charging integrated device consisting of a control system, a motor drive subsystem, and a lithium battery charging subsystem is integrated into a chassis shell, a plug and a wiring harness. This reduces the manufacturing cost ratio, reduces weight and installation space, and is easy to install. It can be applied to hydrogen fuel cell-lithium battery hybrid vehicles.

[0019] Furthermore, it can be applied to hydrogen fuel cell-lithium battery hybrid vehicles.

[0020] The present invention aims at the popularization of hydrogen fuel cell-lithium battery hybrid vehicles. The lithium battery charging system and the motor drive system are independent of each other, the manufacturing cost is high, the installation space is wasted, the safety is poor, the efficiency is low, and the like. The main advantages are as follows:

[0021] (1) Innovation in topological structure: In order to realize the high integration of motor drive and lithium battery charging functions, a main circuit is adopted to realize the motor drive in a time-sharing manner, and the inverter DC / AC and three-phase AC power supply are used to charge the lithium battery through rectified AC / DC, which simplifies the design.

[0022] (2) A coordinated control strategy is proposed. According to the operating conditions of the fuel cell-lithium battery hybrid vehicle, the energy required for motor drive can be flexibly allocated. One of "hydrogen fuel cell power supply", "lithium battery power supply" and "hybrid power supply" can be selected. One of the power supply methods for charging can be selected as needed, including "rectified power supply from three-phase AC power supply, power supply from hydrogen fuel cell system during motor operation, and power supply from hydrogen fuel cell system when parked", so as to improve the efficiency and endurance of the vehicle.

[0023] (3) Process innovation is achieved. By using one housing, one plug and wiring harness, it has two functions of charging the lithium battery and obtaining energy from the lithium battery or hydrogen fuel cell system to drive the motor, so as to reduce the manufacturing cost ratio, reduce weight and installation space, and facilitate installation.

[0024] (4) The present invention is not only applicable to fuel cell-lithium battery hybrid vehicles, but also applicable to vehicles that use battery energy storage to invert power to supply the motor and use a charger to charge the energy storage device. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 FIG. is a schematic structural diagram of an integrated device for motor drive and lithium battery charging of a hybrid vehicle provided by an embodiment of the present invention.

[0026] Figure 2 FIG. is a schematic circuit diagram during motor drive of an integrated device for motor drive and lithium battery charging of a hybrid vehicle provided by an embodiment of the present invention.

[0027] Figure 3 FIG. is a schematic circuit diagram during lithium battery charging of an integrated device for motor drive and lithium battery charging of a hybrid vehicle provided by an embodiment of the present invention.

[0028] BRIEF DESCRIPTION OF THE DRAWINGS: 1. Hydrogen fuel cell system; 2. Lithium battery; 3. Main circuit; 4. Control system; 5. Permanent magnet synchronous motor; 6. First DC interface; 7. Second DC interface; 8. AC output interface; 9. AC input interface; 10. Three-phase AC power supply; 1-1. Hydrogen fuel cell stack; 1-2. DC / DC converter; 4-1. Main controller; 4-2. Motor drive control module; 4-3. Charging control module; 4-4. Processing module; 4-5. Communication module; 4-6. Fault module; 4-7. I / O module. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] The present invention will be further described below in conjunction with the embodiments and the drawings, but the present invention is not limited thereto.

[0030] The present invention integrates the functions of "motor drive and lithium battery charging", realizes the integration of motor drive and lithium battery charging for a hydrogen fuel cell-lithium battery hybrid vehicle, and ensures the safe and efficient operation of the permanent magnet synchronous motor drive and lithium battery charging.

[0031] An integrated method for motor drive and lithium battery charging of a hybrid vehicle provided by the present invention is realized by using an integrated device for motor drive and lithium battery charging composed of a control system, a motor drive subsystem, and a lithium battery charging subsystem. The motor drive subsystem converts the direct current output by the hydrogen fuel cell system, or the direct current output by the lithium battery, or the mixed direct current output of both into adjustable alternating current to drive the permanent magnet synchronous motor, driving the vehicle connected to the permanent magnet synchronous motor; the lithium battery charging subsystem rectifies the alternating current into adjustable direct current or uses the direct current output by the hydrogen fuel cell system to charge the lithium battery; the main controller in the control system controls the safe and efficient operation of the two subsystems to complete the permanent magnet synchronous motor drive and lithium battery charging through a coordinated control strategy.

[0032] An integrated method for motor drive and lithium battery charging of a hybrid vehicle, the method comprising: the motor drive subsystem realizes the drive of the permanent magnet synchronous motor, and the lithium battery charging subsystem realizes the charging of the lithium battery;

[0033] (1) Motor drive subsystem: The motor drive subsystem is composed of a hydrogen fuel cell system, a lithium battery, a main circuit, a motor drive control module in the control system, a permanent magnet synchronous motor, a first switch and a second switch, a second contactor, a first DC interface, a second DC interface, and an AC output interface; the hydrogen fuel cell system is composed of a hydrogen fuel cell stack and a DC / DC converter, and the method for realizing the drive of the permanent magnet synchronous motor is as follows:

[0034] First, the acceleration of the foot pedal and the operating conditions of the vehicle are collected in real time, and one of the three power supply methods of "hydrogen fuel cell power supply, lithium battery power supply, and hybrid power supply" is selected as the DC power supply for the motor drive subsystem; when "hydrogen fuel cell power supply" is selected for operation, the first switch is closed, the second switch is open, the first contactor is open, and the second contactor is closed; when "lithium battery power supply" is selected for operation, the first switch is open, the second switch is closed, the first contactor is open, and the second contactor is closed; when "hybrid power supply" is required for operation, both the first switch and the second switch are closed, the second contactor is closed, and the first contactor is open; when parking is required, the first switch, the second switch, the first contactor, and the second contactor are all open;

[0035] Then, under the action of the DC power supply of the motor drive subsystem, the system composed of the main circuit, the motor drive control module in the control system, and the permanent magnet synchronous motor converts the direct current into adjustable alternating current according to the command of the main controller to drive the permanent magnet synchronous motor, driving the vehicle connected to the permanent magnet synchronous motor.

[0036] (2) Lithium battery charging subsystem: The lithium battery charging subsystem consists of a three-phase AC power supply, an AC input interface, a hydrogen fuel cell system, a main circuit, a charging control module in the control system, a first contactor, a first switch, and a second switch. The method for realizing lithium battery charging is as follows:

[0037] AC power supply charging: When the vehicle stops running and the battery level of the lithium battery is lower than the threshold, the system composed of a three-phase AC power supply, an AC input interface, a main circuit, a charging control module in the control system, a first contactor, and a second switch realizes intelligent charging of the lithium battery;

[0038] During the running of the vehicle, when the voltage of the direct current output by the hydrogen fuel cell system is higher than the voltage of the lithium battery and the battery level of the lithium battery is lower than the threshold, the system composed of the hydrogen fuel cell system, a first switch, a second switch, and a charging module in the control system realizes intelligent charging of the lithium battery;

[0039] During the running of the vehicle, when the vehicle braking requires energy regeneration and the battery level of the lithium battery is lower than the threshold, the system composed of a permanent magnet synchronous motor, a second contactor, a main circuit, a second switch, and a charging module in the control system realizes intelligent charging of the lithium battery;

[0040] The coordinated control between the driving method of the permanent magnet synchronous motor and the lithium battery charging method is realized by the main controller in the control system; Through the above steps, the operation of the permanent magnet synchronous motor drive and lithium battery charging of the hybrid vehicle is realized.

[0041] Furthermore, the control system consists of a main controller, a motor drive control module, a charging control module, and other modules, which are integrated on a PCB board. The control system is provided with 4 CPUs, corresponding to the main controller, the motor drive control module, the charging control module, and other modules respectively.

[0042] Furthermore, the other modules include a processing module, a communication module, a fault module, and an I / O module. The processing module is used to quantitatively process and filter the pedal acceleration and the operating condition information of the vehicle, and the processed signal is used by the main controller; The communication module is a tool for the main controller to communicate with the outside world, and is used to receive external signals and report the status of the lithium battery and the main controller to the outside world; The fault module is used to detect possible faults in real time, take measures to remedy them, and notify the user; The on-off of the first switch and the second switch, the first contactor and the second contactor is realized by the I / O module.

[0043] Furthermore, integrate the motor drive and lithium battery charging integrated device composed of the control system, motor drive subsystem, and lithium battery charging subsystem, and use one chassis housing, one plug, and wiring harness. This can reduce the manufacturing cost ratio, reduce weight and installation space, and facilitate installation. It can be applied to hydrogen fuel cell-lithium battery hybrid vehicles.

[0044] Furthermore, it can be applied to hydrogen fuel cell-lithium battery hybrid vehicles.

[0045] The integrated method for motor drive and lithium battery charging of the hydrogen fuel cell-lithium battery hybrid vehicle provided by the present invention can be realized by the integrated device for motor drive and lithium battery charging. The structure of this device is as Figure 1 shown: It is composed of a motor drive subsystem, a lithium battery charging subsystem, and a control system. The main controller in the control system controls the safe and efficient operation of the two subsystems to complete permanent magnet synchronous motor drive and lithium battery charging through a coordinated control strategy.

[0046] The described motor drive subsystem is composed of a hydrogen fuel cell system 1, a lithium battery 2, a main circuit 3, a control system 4, a permanent magnet synchronous motor 5, a switch K1 (i.e., the first switch) and a switch K2 (i.e., the second switch), a contactor KM2 (i.e., the second contactor), a DC interface 6 (i.e., the first DC interface), a DC interface 7 (i.e., the second DC interface), and an AC output interface 8. The hydrogen fuel cell system 1 is composed of a hydrogen fuel cell stack 1-1 and a DC / DC converter 1-2 to form the motor drive subsystem. The described lithium battery charging subsystem is composed of a three-phase AC power supply 10, an AC input interface 9, the hydrogen fuel cell system 1, the main circuit 3, a charging control module 4-3 in the control system, a contactor KM1 (i.e., the first contactor), and switches K1 and K2.

[0047] The hydrogen fuel cell stack 1-1 generates direct current. The positive output terminal thereof is connected to one end of the DC / DC converter 1-2, and the other end of the DC / DC converter 1-2 is connected to the DC interface 6. The positive terminal (U1+) of the DC interface 6 is connected to the positive terminal (U+) of the main circuit through the switch K1, and the negative terminal (U1-) of the DC interface 6 is directly connected to the negative terminal (U-) of the main circuit; the output of the lithium battery is connected to the DC interface 7. The positive terminal (U2+) of the DC interface 7 is connected to the positive terminal (U+) of the main circuit through the switch K2, and the negative terminal (U2-) of the DC interface 7 is directly connected to the negative terminal (U-) of the main circuit; the AC terminal of the main circuit 3 is connected to the contactor KM2, and the other end of the KM2 is connected to the permanent magnet synchronous motor 5 through the AC output interface 8; the three-phase AC power supply 10 is connected to the contactor KM1 through the AC input interface 8, and the other end of the contactor KM1 is connected to the AC terminal of the main circuit.

[0048] The motor drive subsystem and the lithium battery charging subsystem share the main circuit 3 in a time-sharing manner. It includes a first bridge arm connected to power device V1 and power device V4, a second bridge arm connected to power device V3 and power device V6, and a third bridge arm connected to power device V5 and power device V2; the midpoint of the three bridge arms serves as the AC end of the main circuit 3, and the two ends of the three bridge arms are connected in parallel as the DC end of the main circuit 3; V1-V6 are IGBT tubes, D1-D6 are diodes, and the function of D1-D6 is to protect V1-V6.

[0049] In the motor drive subsystem, the contactor KM1 is disconnected, the contactor KM2 is closed, the AC end of the main circuit is connected to the contactor KM2, and then connected to the permanent magnet synchronous motor 5 through the AC output interface 8, as shown in FIG. Figure 2 shown.

[0050] In the lithium battery charging subsystem, the contactor KM2 is disconnected, the contactor KM1 is closed, the three-phase AC power supply 10 is connected to the contactor KM1 through the AC input interface 9, and the other end of the contactor KM1 is connected to the AC end of the main circuit 3, such as Figure 3 shown.

[0051] The control system 4 is composed of a main controller 4-1, a motor drive control module 4-2, a charging control module 4-3, and other modules. The other modules include a processing module 4-4, a communication module 4-5, a fault module 4-6, an I / O module 4-7, etc.

[0052] The coordinated control strategy is: let SF11, SF12, SF13, and SF14 represent the four power supply modes of the motor drive subsystem, namely: hydrogen fuel cell power supply, lithium battery power supply, hybrid power supply, and no power supply; let SF21, SF22, and SF23 represent the three power supply modes of the lithium battery charging subsystem, namely: three-phase AC power supply after rectification, hydrogen fuel cell system power supply when the motor is running, and hydrogen fuel cell system power supply when the motor is parked; its value is "1" for valid and "0" for invalid, and both are set by the main controller in the control system. The coordinated control strategy is implemented by the main controller, specifically:

[0053] (1) Start and initialize;

[0054] Start the control system; reset variables SF11, SF12, SF13, SF14 and SF21, SF22, SF23, that is, their values ​​are all "0".

[0055] (2) Coordinated control of motor operation;

[0056] One of the four power supply methods of the motor drive subsystem, namely "hydrogen fuel cell power supply, lithium battery power supply, hybrid power supply, and non-power supply", can be selected according to needs. When "hydrogen fuel cell power supply" is selected for operation, switch K1 is closed, switch K2 is open, contactor KM1 is open, and contactor KM2 is closed. At this time, SF11 = "1"; when "lithium battery power supply" is selected for operation, switch K1 is open, switch K2 is closed, contactor KM1 is open, and contactor KM2 is closed. At this time, SF12 = "1"; when "hybrid power supply" is required for operation, both switch K1 and switch K2 are closed, contactor KM2 is closed, and contactor KM1 is open; at this time, SF13 = "1"; when parking is required, switch K1, switch K2, contactor KM1, and contactor KM2 are all open.

[0057] (3) Coordinated control during lithium battery charging;

[0058] One of the power supply methods for charging can be selected according to needs, namely "rectified power supply from three-phase AC power supply, power supply from hydrogen fuel cell system during motor operation, power supply from hydrogen fuel cell system during parking". When charging with "rectified power supply from three-phase AC power supply", switch K1 is open, switch K2 is closed, contactor KM1 is turned on, and contactor KM2 is open. At this time, SF21 = "1"; when charging with "power supply from hydrogen fuel cell system during motor operation" is required, both switch K1 and switch K2 are closed, contactor KM1 is open, and contactor KM2 is closed. At this time, SF22 = "1"; when charging with "power supply from hydrogen fuel cell system during parking" is required, both switch K1 and switch K2 are closed, and both contactor KM1 and contactor KM2 are open. At this time, SF23 = "1".

[0059] The working principle of the motor drive control module is to adjust the magnitudes of the drive voltage and drive current according to the method corresponding to the value of "1" in SF1i (i = 1, 2, 3, 4) and according to the command of the main controller. Using the pulse width PWM method, the purpose of converting direct current into adjustable alternating current (inverting DC / AC) is achieved by adjusting the period and duty cycle of PWM. The motor rotates under the drive of this alternating current, and then drives the vehicle connected to the permanent magnet synchronous motor to operate. Inversion control technologies such as the space vector method are well-known to the public, so they will not be elaborated here.

[0060] The working principle of the charging control module is based on the corresponding method when the value of SF2i (i = 1, 2, 3) is "1". When SF21 = "1", the purpose of converting the input alternating current into adjustable direct current (rectifying AC / DC) can be achieved by adjusting the period and duty cycle of PWM. When the voltage of this direct current is higher than the voltage of the lithium battery, it charges the lithium battery. Under the same battery state, the higher the voltage of the rectified output direct current, the greater the charging current. When SF22 = "1" or when SF23 = "1", when the voltage of the direct current output by the hydrogen fuel cell system is higher than the voltage of the lithium battery, it charges the lithium battery.

[0061] The processing module 4-4 in the control system is used to perform quantization processing and filtering on all input signals, and the processed signals are provided for the controller to use; the communication module 4-5 is a tool for the controller to communicate with the outside world, used to receive external signals, report the battery state and the controller state to the outside world; the fault module 4-6 is used to detect possible faults in real time, take measures to remedy them, and notify the user; the I / O module 4-7 processes digital input / output signals.

[0062] In summary, the present invention integrates the motor drive and lithium battery charging integrated device composed of the control system, the motor drive subsystem, and the lithium battery charging subsystem, and uses a chassis shell, a plug, and a wire harness to reduce the manufacturing cost ratio, reduce the weight and installation space, facilitate installation, and can be applied to hydrogen fuel cell-lithium battery hybrid vehicles.

[0063] The above has introduced in detail a method for integrating motor drive and lithium battery charging in a hybrid vehicle provided by the present invention. The above implementation description is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. An integrated method for motor drive and lithium battery charging of a hybrid vehicle, characterized in that: The method includes: the motor drive subsystem realizes the drive of the permanent magnet synchronous motor, and the lithium battery charging subsystem realizes the charging of the lithium battery; (1) Motor drive subsystem: The motor drive subsystem consists of a hydrogen fuel cell system, a lithium battery, a main circuit, a motor drive control module in the control system, a permanent magnet synchronous motor, a first switch and a second switch, a second contactor, a first DC interface, a second DC interface, and an AC output interface; The hydrogen fuel cell system consists of a hydrogen fuel cell stack and a DC / DC converter. The method for realizing the drive of the permanent magnet synchronous motor is as follows: First, the acceleration of the foot pedal and the operating conditions of the vehicle are collected in real time, and one of the three power supply methods of "hydrogen fuel cell power supply, lithium battery power supply, hybrid power supply" is selected as the DC power supply of the motor drive subsystem; When operating with "hydrogen fuel cell power supply", the first switch is closed, the second switch is open, the first contactor is open, and the second contactor is closed; When operating with "lithium battery power supply", the first switch is open, the second switch is closed, the first contactor is open, and the second contactor is closed; When "hybrid power supply" is required for operation, both the first switch and the second switch are closed, the second contactor is closed, and the first contactor is open; When parking is required, the first switch, the second switch, the first contactor, and the second contactor are all open; Then, under the action of the DC power supply of the motor drive subsystem, the system composed of the main circuit, the motor drive control module in the control system, and the permanent magnet synchronous motor converts the DC power into adjustable AC power according to the command of the main controller in the control system to drive the permanent magnet synchronous motor, driving the vehicle connected to the permanent magnet synchronous motor to operate; (2) Lithium battery charging subsystem: The lithium battery charging subsystem consists of a three-phase AC power supply, an AC input interface, a hydrogen fuel cell system, a main circuit, a charging control module in the control system, a first contactor, a first switch, and a second switch. The method for realizing the charging of the lithium battery is as follows: AC power charging: When the vehicle stops running and the battery level of the lithium battery is lower than the threshold, the system composed of the three-phase AC power supply, the AC input interface, the main circuit, the charging control module in the control system, the first contactor, and the second switch realizes the intelligent charging of the lithium battery; During the operation of the vehicle, when the voltage of the DC power output by the hydrogen fuel cell system is higher than the voltage of the lithium battery and the battery level of the lithium battery is lower than the threshold, the system composed of the hydrogen fuel cell system, the first switch and the second switch, and the charging module in the control system realizes the intelligent charging of the lithium battery; During the operation of the vehicle, when the vehicle braking requires energy feedback and the battery level of the lithium battery is lower than the threshold, the system composed of the permanent magnet synchronous motor, the second contactor, the main circuit, the second switch, and the charging module in the control system realizes the intelligent charging of the lithium battery; The coordinated control between the drive method of the permanent magnet synchronous motor and the charging method of the lithium battery is realized by the main controller in the control system; Through the above steps, the operation of driving the permanent magnet synchronous motor and charging the lithium battery of the hybrid vehicle is realized.

2. The integrated method for motor drive and lithium battery charging of a hybrid vehicle according to claim 1, characterized in that: The control system consists of a main controller, a motor drive control module, a charging control module, and other modules, which are integrated on a PCB board. The control system is provided with 4 CPUs, corresponding to the main controller, the motor drive control module, the charging control module, and other modules respectively.

3. A method for integrating motor drive and lithium battery charging of a hybrid vehicle according to claim 2, characterized in that, The other modules include a processing module, a communication module, a fault module, and an I / O module. The processing module is used to quantitatively process and filter the pedal acceleration and the operating condition information of the vehicle, and the processed signals are supplied to the main controller for use. The communication module is a tool for the main controller to communicate with the outside world, and is used to receive external signals and report the status of the lithium battery and the main controller to the outside world. The fault module is used to detect possible faults in real time, take measures to remedy them, and notify the user. The on / off of the first switch and the second switch, the first contactor and the second contactor are realized by the I / O module.

4. A method for integrating motor drive and lithium battery charging of a hybrid vehicle according to any one of claims 1 to 3, characterized in that Integrate the motor drive and lithium battery charging integrated device composed of the control system, the motor drive subsystem, and the lithium battery charging subsystem, and adopt a chassis shell, a plug, and a wiring harness.

5. A method for integrating motor drive and lithium battery charging of a hybrid vehicle according to any one of claims 1 to 3, characterized in that, It can be applied to hydrogen fuel cell-lithium battery hybrid vehicles.

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