Power-on control method and power-on control system of electric vehicle drive system

Abstract

The present invention provides a power-on control method and a power-on control system for an electric vehicle drive system. The power-on control method comprises: an acquisition step of acquiring the vehicle state of the electric vehicle; a first judgment step of judging whether the driver intends to power on the vehicle according to the vehicle state, if yes, executing the power-on step of powering on the drive system using a power battery, if not, executing the acquisition step; after the first judgment step and before the power-on step, the power-on control method further comprises a disabling step of disabling the charging and discharging of the power battery to prevent the instantaneous current from being too large when the battery relay is closed. The technical solution of the present invention solves the problem of poor safety and reliability of the power-on process of the electric vehicle drive system in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of electric vehicles, and in particular to a power-on control method and a power-on control system of an electric vehicle drive system. Background Art

[0002] With the popularization of pure electric vehicles, their safety has become a focus of users. Different from traditional energy vehicles, pure electric vehicles are powered by electricity, and it is high voltage electricity, so their safety hazards often exist in the process of high voltage power on and off.

[0003] As the functions of pure electric vehicles become more and more complex, the number of controllers installed in the vehicle is also increasing day by day, and can even reach more than 100. This puts forward increasingly stringent requirements on the refinement of the high-voltage power-on process control. The current high-voltage power-on process is too simple and can no longer meet the needs of current models with complex functions, resulting in poor safety and reliability of the power battery supplying high voltage to the drive system. Summary of the invention

[0004] The main purpose of the present invention is to provide a power-on control method and a power-on control system for an electric vehicle drive system, so as to solve the problem of poor safety and reliability in the power-on process of the electric vehicle drive system in the prior art.

[0005] In order to achieve the above-mentioned purpose, the present invention provides a power-on control method for an electric vehicle drive system, comprising: an acquisition step of acquiring a vehicle status of the electric vehicle; a first judgment step of judging whether the driver has the intention of power-on operation according to the vehicle status, and if so, executing a power-on step of powering on the drive system using a power battery, and if not, executing the acquisition step; after the first judgment step and before the power-on step, the power-on control method also includes a disabling step of disabling charging and discharging of the power battery to prevent excessive instantaneous current when the battery relay is closed.

[0006] Furthermore, the disabling step includes sending a disabling instruction to each load controller through the vehicle controller to prohibit each load controller from transmitting an activation instruction to each corresponding load.

[0007] Furthermore, the disabling step also includes the vehicle controller sending an instruction to the battery controller to prohibit the power battery from charging.

[0008] Furthermore, the vehicle status is at least one of a PTC status, a hood status, a status of a remote start inhibit function, an anti-theft verification result, a gear status, a power battery status, a vehicle speed, a brake pedal status, an ignition switch status, whether there is a fault in the vehicle's braking system, and a status of a charge and discharge gun.

[0009] Furthermore, after the power-on step, the power-on control method also includes a second judgment step of judging whether the power-on step is completed within a first preset time period. If so, a disabling step of disabling the charging and discharging of the power battery is executed; if not, a fault code 1 reporting step of forming a fault code 1 and transmitting the fault code 1 to a storage unit is executed.

[0010] Furthermore, after the disabling step, the power-on control method also includes a third judgment step of monitoring and judging whether the DC / DC converter works normally for a second preset time period. If yes, a fourth judgment step is executed; if not, a fault code 2 reporting step of forming fault code 2 and transmitting fault code 2 to a storage unit is executed.

[0011] Furthermore, the fourth judgment step includes judging whether the drive system completes initialization within the third preset time. If so, executing the completion instruction sending step of sending a power-on completion instruction to the instrument controller; if not, executing the fault code three reporting step of forming fault code three and transmitting fault code three to the storage unit.

[0012] Furthermore, after the fourth judgment step and before the completion instruction sending step, the power-on control method also includes a fifth judgment step of judging whether the vehicle braking system is in a braking state within a fourth preset time period; if so, the completion instruction sending step is executed; if not, the fault code four is formed and the fault code four reporting step of transmitting the fault code four to the storage unit is executed.

[0013] According to another aspect of the present invention, the present invention provides a power-on control system for an electric vehicle, the control system is used to execute the above-mentioned power-on control method of the electric vehicle drive system, and the power-on control system includes: a controller module, used to detect the vehicle status of the electric vehicle; a judgment module, connected to the controller module, the judgment module is used to judge whether the driver has the intention of power-on operation; a vehicle controller, connected to the judgment module, the vehicle controller prohibits the charging and discharging of the power battery according to the information transmitted by the judgment module.

[0014] Furthermore, the power-on control system also includes multiple load controllers connected to the vehicle controller, the multiple load controllers include a DC / DC converter, a PTC controller, an air conditioning controller and an air suspension controller, and the vehicle controller sends a disable instruction to the load controller.

[0015] By applying the technical solution of the present invention, before the power battery supplies high voltage electricity to the drive system, the various high and low voltage loads are prohibited from drawing electricity from the high voltage battery and the power battery is prohibited from charging by disabling the charging and discharging of the power battery. In this way, when the power battery supplies high voltage electricity to the drive system, the problem of electric arc caused by excessive potential difference (excessive current) at the moment of relay closing can be avoided, thereby improving the safety and reliability of the power-on process. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0017] Figure 1 A schematic flow chart of a power-on control method according to an embodiment of the present invention is shown; and

[0018] Figure 2 Another schematic flow chart of the power-on control method according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0019] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0020] It should be noted that the electric vehicle in the embodiment of the present invention refers to a pure electric vehicle.

[0021] It should be noted that in the embodiments of the present invention, the driving mode of pure electric vehicles is different from that of traditional energy vehicles. Traditional energy vehicles rely on engines to convert chemical energy into mechanical energy. As long as the engine can be ignited and there are no faults that affect driving, the driver can drive the vehicle. Pure electric vehicles rely on drive motors to convert electrical energy into mechanical energy, and the drive system often requires high voltage electricity. When the electric vehicle has completed high voltage power-up and there are no faults that affect driving, the driver can drive the vehicle.

[0022] The upper high voltage of a pure electric vehicle is a broad concept. It includes but is not limited to the upper high voltage of the air-conditioning system, the upper high voltage of the charging and discharging system, the upper high voltage of the drive, etc. When the upper high voltage of the air-conditioning system or the upper high voltage of the charging and discharging system is on, the whole vehicle does not have the ability to drive. The upper high voltage mentioned in the present invention refers to the upper high voltage of the drive system, that is, the high-voltage power battery supplies power to the drive system. That is, the power-on in the embodiment of the present invention refers to the power battery supplying the upper high voltage to the drive system.

[0023] It should be noted that, in the embodiment of the present invention, the driving system includes components such as a driving motor, a capacitor and a cooling system.

[0024] like Figure 1As shown, an embodiment of the present invention provides a power-on control method for an electric vehicle drive system. The power-on control method comprises: an acquisition step of acquiring the vehicle state of the electric vehicle; a first judgment step of judging whether the driver has the intention of power-on operation according to the vehicle state, if yes, executing the power-on step of powering on the drive system using the power battery, if not, executing the acquisition step; after the first judgment step and before the power-on step, the power-on control method further comprises a disabling step of disabling the charging and discharging of the power battery to prevent the instantaneous current from being too large when the battery relay is closed.

[0025] In the above technical solution, before the power battery supplies high voltage electricity to the drive system, the various high and low voltage loads are prohibited from drawing power from the high voltage battery and the power battery is prohibited from charging by disabling the charging and discharging of the power battery. In this way, when the power battery supplies high voltage electricity to the drive system, the problem of electric arc caused by excessive potential difference (excessive current) at the moment of relay closing can be avoided, thereby improving the safety and reliability of the power-on process.

[0026] Specifically, in the embodiment of the present invention, after the acquisition step and before the first judgment step, the power-on control method further includes a sixth judgment step of judging whether the drive system is in a power-on state, and if so, executing an exit step of exiting the power-on process, and if not, executing the first judgment step. In this way, the energy consumption of the electric vehicle can be avoided from being increased.

[0027] Specifically, in an embodiment of the present invention, the disabling step includes sending a disabling instruction to each load controller through the vehicle controller to prohibit each load controller from transmitting an activation instruction to each corresponding load.

[0028] Through the above-mentioned arrangement, it is difficult for each load controller to transmit activation instructions to the corresponding load. In this way, each load can be prohibited from drawing power from the high-voltage battery. When the power battery supplies high voltage to the drive system, the problem of electric arc caused by excessive potential difference (excessive current) when the relay closes at the moment can be avoided, thereby improving the safety and reliability of the power-on process.

[0029] Specifically, in an embodiment of the present invention, the disabling step further includes the vehicle controller sending an instruction to the battery controller to prohibit the power battery from charging. In this way, the high-voltage battery can be prohibited from charging, and when the power battery supplies high voltage to the drive system, the problem of excessive current at the moment of relay closing can be avoided, thereby improving the safety and reliability of the power-on process.

[0030] Specifically, in an embodiment of the present invention, the vehicle status is at least one of the PTC status, the hood status, the status of the remote start inhibit function, the anti-theft verification result, the gear status, the status of the power battery, the vehicle speed, the status of the brake pedal, the status of the ignition switch, the DC / DC converter status, whether there is a fault in the vehicle braking system, and the status of the charging and discharging gun.

[0031] In the above technical scheme, compared with the prior art which only identifies the action position of the key door signal, this embodiment also identifies many signals such as the anti-theft verification result, vehicle speed, gear position, power battery status, ignition switch status, brake pedal action position, etc. This can more fully interpret the driver's intention, thereby ensuring that the driver has a clear intention to drive the high voltage electricity. This can effectively reduce the possibility of misjudgment of power-on, thereby improving the safety and reliability of the power-on process.

[0032] It should be noted that in an embodiment of the present invention, if the drive system needs to be powered on, before the acquisition step, the driver will generally step on the brake pedal to put the brake pedal in a braking state, and will press the key door. Therefore, when determining whether the driver has the intention to power on, it is necessary to first satisfy that the brake pedal is in a braking state and the key door is in an identified state.

[0033] It should be noted that in a preferred embodiment of the present invention, when PTC can be disabled, the hood is not opened, the remote start disable function is not activated, the anti-theft check has passed, the gear is in P or N, the high-voltage power battery initialization is complete and there is no fault, the vehicle speed is lower than 3km / h, the brake pedal is in the braking state, the ignition switch is in the starting state, the vehicle braking system has no faults, the charging and discharging gun is not inserted, and there is no fault that affects the high voltage on the drive, it can be judged that the driver has the intention to power on.

[0034] It should be noted that, in an embodiment of the present invention, when the brake pedal is in a braking state and the key door is in an identified state, the possibility of the driver's intention to power on can be judged in the priority order of passed anti-theft check, hood not opened, gear in P or N, vehicle speed less than 3km / h, high-voltage power battery initialization completed and without faults, PTC can be disabled, and DC / DC converter without faults. The more the conditions are met, the greater the possibility that the driver has the intention to power on.

[0035] In an optional embodiment, when the brake pedal is in the braking state and the key door is identified, when the anti-theft check has passed, the hood is not opened, the gear is in P or N, and the vehicle speed is less than 3km / h, it can also be considered that the driver has the intention to power on.

[0036] Specifically, in an embodiment of the present invention, the power-on step includes the vehicle controller sending a power-on instruction to the battery controller to control multiple relays of the power battery to be closed or opened in an orderly manner. In this way, the power-on step can be implemented.

[0037] It should be noted that in the embodiment of the present invention, the order of closing and opening of multiple relays is: the main positive relay, the main negative relay and the pre-charging relay are all disconnected first, and then the main negative relay and the pre-charging relay are closed, and after detecting the voltage, the main positive relay is closed again, and the pre-charging relay is disconnected, thereby realizing the power-on step.

[0038] like Figure 2 As shown, in an embodiment of the present invention, after the power-on step, the power-on control method also includes a second judgment step of judging whether the power-on step is completed within a first preset time period, and if so, executing a disabling step of disabling the charging and discharging of the power battery, and if not, executing a fault code 1 reporting step of forming a fault code 1 and transmitting the fault code 1 to a storage unit.

[0039] In the above technical scheme, on the one hand, if the power-on step is completed within the first preset time period, that is, multiple relays complete the instructions of attraction or disconnection within the first preset time period, then the step of unblocking the power battery charging and discharging is executed. In this way, before the multiple relays are closed, that is, before the high voltage is applied, the power battery charging and discharging is first disabled, so as to prevent the problem of electric arc caused by excessive current at the moment of relay closing, and after the multiple relays are safely closed, the restriction on load power supply can be lifted by unblocking the power battery charging and discharging, so as to make the entire power-on process safer and more reliable; on the other hand, if the power-on step is not completed within the first preset time period, a fault code 1 is generated, and the fault code 1 is transmitted to the storage unit, so that the fault code 1 can be stored to facilitate later troubleshooting and problem location, which is more humane and intelligent.

[0040] Specifically, in an embodiment of the present invention, after the step of reporting the fault code, the power-on control method further includes a step of exiting the power-on process.

[0041] like Figure 2 As shown, in an embodiment of the present invention, after the disabling step, the power-on control method also includes a third judgment step of monitoring and judging whether the DC / DC converter works normally for a second preset time period. If yes, a fourth judgment step is executed; if not, a fault code 2 reporting step of forming fault code 2 and transmitting fault code 2 to a storage unit is executed.

[0042] Through the above settings, on the one hand, if the DC / DC converter can work normally within the second preset time period, this can ensure that each low-voltage load and each corresponding controller can obtain continuous and stable power supply; on the other hand, if the DC / DC converter is difficult to work normally within the second preset time period, this can form fault code 2 and transmit fault code 2 to the storage unit, so that fault code 2 can be stored to facilitate subsequent troubleshooting and problem location, which is more humane and intelligent.

[0043] Specifically, in an embodiment of the present invention, after the step of reporting the second fault code, the power-on control method further includes a step of exiting the power-on process.

[0044] like Figure 2 As shown, in an embodiment of the present invention, the fourth judgment step includes judging whether the drive system completes initialization within a third preset time, and if so, executing a completion instruction sending step of sending a power-on completion instruction to the instrument controller, and if not, executing a fault code three reporting step of forming fault code three and transmitting fault code three to the storage unit.

[0045] Through the above settings, on the one hand, if the drive system completes initialization within the third preset time and there is no fault, this can ensure that there is no fault affecting power-on, thereby ensuring safe power-on; on the other hand, if the drive system is difficult to complete initialization within the third preset time, this can form fault code three, and fault code three can be transmitted to the storage unit, so that fault code three can be stored to facilitate subsequent troubleshooting and problem location, which is more humane and intelligent.

[0046] Specifically, in an embodiment of the present invention, the drive system includes a front drive motor and a rear drive motor.

[0047] Specifically, in an embodiment of the present invention, after the step of reporting the third fault code, the power-on control method further includes a step of exiting the power-on process.

[0048] like Figure 2 As shown, in an embodiment of the present invention, after the fourth judgment step and before the completion instruction sending step, the power-on control method also includes a fifth judgment step of judging whether the vehicle braking system is in a braking state within a fourth preset time period; if so, the completion instruction sending step is executed; if not, the formation of fault code four and the fault code four reporting step of transmitting the fault code four to the storage unit are executed.

[0049] Through the above-mentioned arrangement, on the one hand, if the braking system of the whole vehicle is in a braking state within the fourth preset time, the drive system can be prevented from generating back electromotive force, thereby avoiding the problem of conflict between the drive system and the power battery, thereby improving the safety and reliability of the power-on process; on the other hand, if the braking system of the whole vehicle is difficult to be in a braking state within the fourth preset time, fault code four can be generated, and fault code four can be transmitted to the storage unit, so that fault code four can be stored to facilitate later troubleshooting and problem positioning, which is more user-friendly and intelligent.

[0050] Specifically, in an embodiment of the present invention, after the step of reporting fault code four, the power-on control method further includes a step of exiting the power-on process.

[0051] Specifically, in an embodiment of the present invention, after sending a power-on completion instruction to the instrument controller, the instrument controller controls the instrument panel to light up a corresponding icon or indicator light.

[0052] It should be noted that, in the embodiment of the present invention, the first preset time period, the second preset time period, the third preset time period and the fourth preset time period can be set according to specific circumstances. Among them, the values ​​of the third preset time period and the fourth preset time period can be the same or different.

[0053] The embodiment of the present invention provides a power-on control system for an electric vehicle. The control system is used to execute the power-on control method of the electric vehicle drive system, and the power-on control system includes: a controller module, which is used to detect the vehicle state of the electric vehicle; a judgment module, which is connected to the controller module, and the judgment module is used to judge whether the driver has the intention of power-on operation; a vehicle controller, which is connected to the judgment module, and the vehicle controller prohibits the charging and discharging of the power battery according to the information transmitted by the judgment module.

[0054] In the above technical solution, before the power battery supplies high voltage electricity to the drive system, the various high and low voltage loads are prohibited from drawing power from the high voltage battery and the power battery is prohibited from charging by disabling the charging and discharging of the power battery. In this way, when the power battery supplies high voltage electricity to the drive system, the problem of electric arc caused by excessive potential difference (excessive current) at the moment of relay closing can be avoided, thereby improving the safety and reliability of the power-on process.

[0055] Specifically, in an embodiment of the present invention, the controller module collects signals related to the high-voltage power-on of the drive system, that is, detects the vehicle status of the electric vehicle, and then calculates the above signals, and then sends the calculated information to the main controller, which is mainly responsible for logical analysis and judgment to form a judgment module.

[0056] Of course, in an alternative embodiment, the judgment module can also be integrated into the vehicle controller.

[0057] Preferably, in an embodiment of the present invention, the controller module includes a body controller that monitors and transmits the body status to the judgment module, a gear controller that is responsible for monitoring and transmitting the gear status to the judgment module, a body stability controller that is responsible for transmitting the vehicle speed to the judgment module, and a battery controller that is responsible for monitoring and transmitting the status of the high-voltage power battery to the judgment module; wherein the body status includes the key door position, the result of the anti-theft check, the brake pedal status, the status of the ignition switch, and the status of the charging and discharging gun, etc.

[0058] It should be noted that in the embodiment of the present invention, the status of the remote start function, whether there is a fault in the vehicle braking system, and whether there is a fault affecting the high voltage on the drive are all monitored by the vehicle controller, that is, some modules in the vehicle controller belong to the controller module.

[0059] Preferably, in an embodiment of the present invention, the controller module also includes a vehicle speed sensor connected to the vehicle body stability controller to transmit the vehicle speed monitored by the vehicle speed sensor to the judgment module via the vehicle body stability controller, and the brake switch sensor is connected to the vehicle body stability controller, so that the brake switch sensor obtains the brake pedal status signal and transmits it to the judgment module via the vehicle body stability controller.

[0060] Specifically, in an embodiment of the present invention, the judgment module can interpret and analyze the input signal about the vehicle status, determine whether the driver intends to increase the high voltage, and send corresponding control instructions to the lower-level controller through the vehicle controller to execute the corresponding action instructions.

[0061] Specifically, in an embodiment of the present invention, the power-on control system also includes multiple load controllers connected to the vehicle controller, the multiple load controllers include a motor controller, a DC / DC converter, a PTC controller, an air conditioning controller and an air suspension controller, and the vehicle controller sends a disable instruction to the load controller.

[0062] Through the above settings, the functions of loads such as motors, DC / DC converters, vehicle air conditioners, vehicle PTC heating, air suspension adjustment, etc. can be prohibited from not responding to request instructions for function activation. In this way, the above loads can be prevented from drawing power from the power battery, and the problem of electric arc caused by excessive potential difference (excessive current) at the moment of relay closing can be avoided, thereby improving the safety and reliability of the power-on process.

[0063] Specifically, in the embodiment of the present invention, disabling battery charging and discharging may also disable the following functions: wired charging and wired charging heating, wireless charging and wireless charging heating. Of course, it is not limited to the above functions.

[0064] It should be noted that, in the embodiment of the present invention, the vehicle controller is responsible for receiving status signals reported by other controllers, issuing control instructions after comprehensive calculations, and controlling each controller to perform related operations, such as sending instructions to the battery controller to close or disconnect the relay, sending instructions to the instrument controller to light up or turn off the indicator light or icon, and storing fault codes when power-on fails.

[0065] It should be noted that in the embodiment of the present invention, the battery controller is responsible for monitoring and reporting the current working status of the battery, such as whether there is a fault, whether initialization is completed, receiving instructions from the vehicle controller, controlling the closing and opening of each relay in sequence, and reporting the state of each relay being closed or opened.

[0066] It should be noted that, in the embodiment of the present invention, the power-on control system also includes an instrument controller responsible for receiving instructions from the vehicle controller and lighting up indicator lights or icons.

[0067] The power-on control system also includes a storage unit responsible for storing fault codes when power-on fails, which can be integrated into the vehicle controller.

[0068] It should be noted that, in the embodiment of the present invention, the motor controller is responsible for monitoring and reporting the working status of the drive system, such as whether there is a fault and whether initialization is completed.

[0069] It should be noted that in the embodiments of the present invention, a controller that can be equipped with the algorithm described in the present invention, has a certain computing power, can analyze signals, and determine and process faults can replace the vehicle controller described above. For example, it can also be a "domain controller."

[0070] From the above description, it can be seen that the above-mentioned embodiments of the present invention achieve the following technical effects: before the power battery supplies high voltage to the drive system, the various high and low voltage loads are prohibited from taking power from the high voltage battery and the power battery is prohibited from charging by disabling the charging and discharging of the power battery. In this way, when the power battery supplies high voltage to the drive system, the problem of electric arc caused by excessive potential difference (excessive current) at the moment of relay closing can be avoided, thereby improving the safety and reliability of the power-on process.

[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A power-on control method for an electric vehicle drive system, characterized in that: include: The step of obtaining the vehicle status of the electric vehicle; A first judging step of judging whether the driver intends to power on the vehicle according to the vehicle state, and if yes, executing a power-on step of powering on the drive system using a power battery, and if no, executing the obtaining step; After the first judging step and before the power-on step, the power-on control method further includes a disabling step of disabling charging and discharging of the power battery to prevent excessive instantaneous current when the battery relay is closed.

2. The power-on control method of an electric vehicle driving system according to claim 1, characterized in that: The disabling step includes sending a disabling instruction to each load controller through the vehicle controller to prohibit each load controller from transmitting an activation instruction to each corresponding load.

3. The power-on control method of an electric vehicle driving system according to claim 1, characterized in that: The disabling step also includes the vehicle controller sending an instruction to the battery controller to prohibit the power battery from charging.

4. The power-on control method of an electric vehicle drive system according to any one of claims 1 to 3, characterized in that: The vehicle status is at least one of the PTC status, the hood status, the status of the remote start inhibit function, the anti-theft verification result, the gear status, the status of the power battery, the vehicle speed, the status of the brake pedal, the status of the ignition switch, whether there is a fault in the vehicle braking system, and the status of the charging and discharging gun.

5. The power-on control method of an electric vehicle driving system according to any one of claims 1 to 3, characterized in that: After the power-on step, the power-on control method also includes a second judgment step of judging whether the power-on step is completed within a first preset time period. If so, a disabling step of disabling the charging and discharging of the power battery is executed; if not, a fault code 1 reporting step of forming a fault code 1 and transmitting the fault code 1 to a storage unit is executed.

6. The power-on control method of the electric vehicle driving system according to claim 5, characterized in that: After the disabling release step, the power-on control method further includes a third judgment step of monitoring and judging whether the DC / DC converter works normally for a second preset time period; if yes, executing a fourth judgment step; if not, executing a fault code 2 reporting step of forming fault code 2 and transmitting the fault code 2 to a storage unit.

7. The power-on control method of the electric vehicle driving system according to claim 6, characterized in that: The fourth judgment step includes judging whether the drive system completes initialization within the third preset time. If so, executing the completion instruction sending step of sending a power-on completion instruction to the instrument controller. If not, executing the fault code three reporting step of forming fault code three and transmitting the fault code three to the storage unit.

8. The power-on control method of the electric vehicle driving system according to claim 7, characterized in that: After the fourth judgment step and before the completion instruction sending step, the power-on control method also includes a fifth judgment step of judging whether the vehicle braking system is in a braking state within a fourth preset time period; if so, executing the completion instruction sending step; if not, executing the fault code four reporting step of forming fault code four and transmitting the fault code four to the storage unit.

9. A power-on control system for an electric vehicle, characterized in that: The control system is used to execute the power-on control method of the electric vehicle drive system according to any one of claims 1 to 8, and the power-on control system includes: A controller module, used for detecting a vehicle state of the electric vehicle; A judgment module connected to the controller module, the judgment module is used to judge whether the driver has the intention of power-on operation; The vehicle controller is connected to the judgment module, and the vehicle controller prohibits the power battery from charging or discharging according to the information transmitted by the judgment module.

10. The electric vehicle power-on control system according to claim 9, characterized in that: The power-on control system also includes multiple load controllers connected to the vehicle controller, the multiple load controllers include a DC / DC converter, a PTC controller, an air conditioning controller and an air suspension controller, and the vehicle controller sends a disable instruction to the load controllers.

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