High-pressure oil tank control strategy and system of new energy automobile

Abstract

The invention discloses a high-pressure oil tank control strategy and system for a new energy automobile, and the strategy comprises the steps: responding to a leakage diagnosis request sent by an engine management system, controlling an oil tank isolation valve to be opened, and enabling the oil tank isolation valve to be arranged between a high-pressure oil tank and a carbon tank; and if a leakage diagnosis stopping request sent by the engine management system is received within first preset time after the oil tank isolation valve is opened, the oil tank isolation valve is controlled to be closed. Through cooperation of the vehicle control unit and the engine management system, the vehicle control unit controls the oil tank isolation valve arranged between the high-pressure oil tank and the carbon tank, so that leakage diagnosis of the high-pressure oil tank is achieved, and environmental pollution caused by fuel leakage is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of new energy vehicles, and more specifically, to a high-pressure fuel tank control strategy and system for new energy vehicles. Background Art

[0002] For traditional fuel vehicles, the engine is the only power source, and it gets its power by burning gasoline. Under normal circumstances, the fuel tank capacity of a private car is about 40L-50L. Therefore, according to the fuel consumption rate of normal commuting, the fuel replenishment cycle is about 20 days.

[0003] In new energy vehicles, the power source of the whole vehicle is fuel and high-voltage battery. Especially for plug-in new energy, for economic considerations, high-voltage battery will be used as the main power source of the whole vehicle, and fuel will be used as a backup energy source to solve the anxiety of range. Therefore, in new energy vehicles, the fuel replenishment cycle is about 2 months or even longer. In order to reduce the ineffective volatilization of gasoline and pollution to the environment, it is necessary to equip new energy vehicles with high-pressure fuel tanks.

[0004] The National VI regulations require leak diagnosis of the fuel tank evaporation system, but the existing technology does not have a clear leak diagnosis control strategy for high-pressure fuel tanks. Summary of the invention

[0005] The present application provides a high-pressure fuel tank control strategy and system for new energy vehicles. Through the collaboration between the vehicle controller and the engine management system, the vehicle controller controls the fuel tank isolation valve arranged between the high-pressure fuel tank and the carbon canister, thereby realizing leakage diagnosis of the high-pressure fuel tank and reducing environmental pollution caused by fuel leakage.

[0006] The present application provides a high-pressure fuel tank control strategy for new energy vehicles, which is applied to a vehicle controller. The high-pressure fuel tank control strategy includes:

[0007] In response to receiving a leak diagnosis request sent by an engine management system, controlling a fuel tank isolation valve to open, the fuel tank isolation valve being arranged between a high pressure fuel tank and a carbon canister;

[0008] If a stop leakage diagnosis request sent by the engine management system is received within a first preset time after the fuel tank isolation valve is opened, the fuel tank isolation valve is controlled to be closed.

[0009] Preferably, if no leakage diagnosis stop request is received from the engine management system within a first preset time after the fuel tank isolation valve is opened, the fuel tank isolation valve is actively controlled to be closed.

[0010] Preferably, the high-pressure fuel tank control strategy of the new energy vehicle also includes:

[0011] In response to receiving a refueling request, determining whether the vehicle meets a refueling condition;

[0012] If yes, the oil tank isolation valve is controlled to open to release the pressure of the high-pressure oil tank;

[0013] Receive a pressure signal from a pressure sensor of a high-pressure oil tank and determine whether the oil tank pressure reaches a preset range;

[0014] If yes, the motor lock of the fuel tank cover is controlled to unlock and a refueling reminder is sent at the same time;

[0015] During refueling, receive the status of the fuel tank cap;

[0016] If the fuel tank cover changes from a closed state to an open state, and then changes from an open state to a closed state, the motor lock of the fuel tank cover is controlled to be locked after a delay of a second preset time.

[0017] Preferably, if the fuel tank cover remains in a closed state within a third preset time after the motor lock of the fuel tank cover is unlocked, the motor lock of the fuel tank cover is actively controlled to be locked.

[0018] Preferably, the high-pressure fuel tank control strategy of the new energy vehicle also includes:

[0019] Receive the pressure signal of the pressure sensor of the high-pressure oil tank in real time;

[0020] If the pressure signal is greater than the upper pressure limit or the pressure signal is less than the lower pressure limit, the oil tank isolation valve is controlled to open to release or replenish the pressure of the high-pressure oil tank;

[0021] If the pressure signal returns to between the upper and lower pressure limits, the oil tank isolation valve is controlled to close.

[0022] The present application also provides a high-pressure fuel tank control system for a new energy vehicle, which is applied to a vehicle controller. The high-pressure fuel tank control system includes a request receiving module, a valve opening module, and a valve closing module;

[0023] The request receiving module is used for receiving a leak diagnosis request and a stop leak diagnosis request sent by the engine management system;

[0024] The valve opening module is used to control the tank isolation valve to open when receiving a leakage diagnosis request sent by the engine management system;

[0025] The valve closing module is used to control the fuel tank isolation valve to close when receiving a stop leakage diagnosis request sent by the engine management system;

[0026] Among them, the fuel tank isolation valve is arranged between the high-pressure fuel tank and the carbon canister.

[0027] Preferably, the high-pressure fuel tank control system of the new energy vehicle further includes a timing module, which is used to time the opening time of the fuel tank isolation valve;

[0028] The valve closing module is used to actively control the fuel tank isolation valve to close when no stop leakage diagnosis request sent by the engine management system is received after a first preset time after the fuel tank isolation valve is opened.

[0029] Preferably, the request receiving module is further used to receive a refueling request;

[0030] The high-pressure fuel tank control system also includes a refueling condition judgment module, a pressure signal receiving module, an unlocking module, a prompt sending module, a fuel tank cover status receiving module and a locking module;

[0031] The refueling condition judgment module is used to judge whether the vehicle meets the refueling conditions after receiving the refueling request;

[0032] The valve opening module is used to control the fuel tank isolation valve to open when a refueling request is received and the vehicle meets the refueling conditions, so as to release the pressure of the high-pressure fuel tank;

[0033] The pressure signal receiving module is used to receive the pressure signal of the pressure sensor of the high-pressure oil tank;

[0034] The unlocking module is used to control the motor lock of the fuel tank cover to unlock when the fuel tank pressure reaches a preset range;

[0035] The prompt sending module is used to send a refueling reminder while controlling the motor lock of the fuel tank cover to unlock;

[0036] The fuel tank cap status receiving module is used to receive the status of the fuel tank cap during the refueling process;

[0037] The locking module is used to control the motor lock of the fuel tank cover to lock after a second preset time delay when the fuel tank cover changes from an open state to a closed state.

[0038] Preferably, the timing module is also used to start timing after the motor lock of the fuel tank cover is unlocked;

[0039] The locking module is also used to actively control the motor lock of the fuel tank cover to lock when the fuel tank cover remains in a closed state within a third preset time after the motor lock of the fuel tank cover is unlocked.

[0040] Preferably, the valve opening module is also used to control the oil tank isolation valve to open when the pressure signal of the high-pressure oil tank is greater than the upper pressure limit or the pressure signal is less than the lower pressure limit, so as to release or replenish the pressure of the high-pressure oil tank;

[0041] The valve closing module is used to control the oil tank isolation valve to close when the pressure signal returns to between the upper pressure limit and the lower pressure limit.

[0042] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the application and, together with the description, serve to explain the principles of the application.

[0044] Figure 1 A schematic diagram of the structure of the fuel system provided for this application;

[0045] Figure 2 A flow chart of the leakage diagnosis function of the high-pressure fuel tank provided by this application;

[0046] Figure 3 A flowchart of the refueling function provided for this application;

[0047] Figure 4 A flow chart of the pressure protection function of the high-pressure fuel tank provided for this application;

[0048] Figure 5 This is a structural diagram of the high-pressure fuel tank control system of the new energy vehicle provided in this application. DETAILED DESCRIPTION

[0049] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application.

[0050] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present application, its application, or uses.

[0051] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0052] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0053] The present application provides a high-pressure fuel tank control strategy and system for new energy vehicles. Through the collaboration between the vehicle controller and the engine management system, the vehicle controller controls the fuel tank isolation valve set between the high-pressure fuel tank and the carbon canister, thereby realizing leakage diagnosis of the high-pressure fuel tank and reducing environmental pollution caused by fuel leakage. In addition, the high-pressure fuel tank is controlled by the vehicle controller, which plays an important role in promoting the development of domain control of the vehicle controller in the current increasingly fierce market competition. The setting of the fuel tank isolation valve can effectively reduce fuel leakage, improve fuel utilization, and save energy. At the same time, the safety of the high-pressure fuel tank is increased through the pressure protection function of the high-pressure fuel tank. On this basis, the present application can make the entire control system more robust by arranging the priority order of multiple usage scenarios.

[0054] As an example, Figure 1 As shown, the fuel system provided by the present application includes a high-pressure fuel tank and a carbon canister. The high-pressure fuel tank is provided with a refueling limit valve, and the carbon canister is provided with an adsorption port, a vent port and a desorption port.

[0055] A fuel tank isolation valve (FTIV) is installed on the pipeline between the refueling limit valve and the adsorption port of the carbon canister. If the pressure in the high-pressure fuel tank is higher than the upper pressure limit, after the FTIV is opened, the gas generated by the evaporation of the fuel in the high-pressure fuel tank enters the carbon canister through the pipeline and the adsorption port, so that the carbon canister adsorbs the evaporated gas, reduces the pressure in the high-pressure fuel tank, and realizes the pressure relief of the high-pressure fuel tank. If the pressure in the high-pressure fuel tank is lower than the lower pressure limit, after the FTIV is opened, the evaporated gas adsorbed in the carbon canister will be replenished into the high-pressure fuel tank through the adsorption port and FTIV, protecting the fuel tank from being deflated by atmospheric pressure.

[0056] A dust filter (ash filter for short) is provided at the end of the pipe between the vent and the atmosphere. The ash filter filters dust in the air entering the carbon canister to prevent the carbon canister from being blocked. A leak diagnosis module is provided between the ash filter and the vent to perform leak diagnosis on the high-pressure fuel tank. Specifically, when the leak diagnosis of the fuel tank is triggered, the FTIV opens and the fuel vapor enters the carbon canister through the FTIV.

[0057] An evaporation pipe is provided between the desorption port and the engine, and a carbon canister solenoid valve is provided on the evaporation pipe. When the carbon canister solenoid valve is opened, the fuel evaporation gas adsorbed in the carbon canister enters the engine through the evaporation pipe, providing part of the fuel for the engine.

[0058] like Figure 1 As shown, a fuel pump is arranged in the high-pressure fuel tank, and a fuel inlet pipe is arranged between the outlet of the fuel pump and the engine, and the fuel required by the engine is mainly provided through the fuel inlet pipe.

[0059] like Figure 1As shown, the high-pressure fuel tank is connected to the fuel tank cap on the vehicle body through a refueling pipe, and a motor lock is provided at the fuel tank cap. After the motor lock is unlocked, the fuel tank cap can be opened to refuel the high-pressure fuel tank.

[0060] like Figure 1 As shown in the figure, a gun jump trigger is provided between the FTIV and the fuel tank cap. During the refueling process, if refueling is performed without opening the FTIV, the refueling limit valve will push upwards, triggering the gun jump trigger, which pushes the refueling gun out, realizing the refueling gun jump and protecting the high-pressure fuel tank.

[0061] Based on the above, the main body of the high-pressure fuel tank control strategy for new energy vehicles provided in this application is the vehicle control unit (VCU), and various functions of the high-pressure fuel tank are realized by controlling the fuel tank isolation valve FTIV by the VCU.

[0062] As an example, Figure 2 As shown, the high-pressure fuel tank control strategy for new energy vehicles provided in this application includes a leakage diagnosis function for the high-pressure fuel tank. Specifically, it includes:

[0063] S210: In response to receiving a leakage diagnosis request sent by an engine management system (EMS), the VCU controls the fuel tank isolation valve FTIV to open for fuel tank leakage diagnosis.

[0064] It should be noted that after the fuel tank isolation valve FTIV is opened, the existing leakage diagnosis method is used to implement leakage diagnosis of the fuel tank, and this application does not impose any limitation.

[0065] S220: The VCU determines whether it receives a stop leakage diagnosis request sent by the engine management system EMS within a first preset time (such as 10 minutes) after the fuel tank isolation valve FTIV is opened. If so, execute S230; otherwise, execute S240.

[0066] S230: VCU controls the oil tank isolation valve FTIV to close and completes the leakage diagnosis of the high-pressure oil tank.

[0067] S240: If the VCU does not receive a request to stop leak diagnosis from the engine management system after the first preset time after the fuel tank isolation valve is opened, it indicates that a fault may occur during the leak diagnosis process. Then, the VCU actively controls the fuel tank isolation valve FTIV to close to ensure the safety of the high-pressure fuel tank.

[0068] As another embodiment, the high-pressure fuel tank control strategy for new energy vehicles provided in this application also includes a refueling function of the high-pressure fuel tank. Figure 3 As shown, the refueling function specifically includes:

[0069] S310: In response to receiving a refueling request from the driver (eg, the driver presses a refueling request switch), the VCU determines whether the vehicle meets the refueling conditions. If yes, S320 is executed; otherwise, S390 is executed.

[0070] As an example, the refueling conditions are:

[0071] 1. The vehicle's Ready light goes out;

[0072] 2. The vehicle speed is less than a threshold (e.g. 3 km / h).

[0073] S320: VCU controls the fuel tank isolation valve FTIV to open, allowing the high-pressure fuel tank to release pressure to prevent fuel backflow.

[0074] S330: The VCU receives the pressure signal of the pressure sensor of the high-pressure oil tank and determines whether the oil tank pressure reaches a preset range. If yes, execute S340; otherwise, return to S330.

[0075] S340: The VCU controls the motor lock of the fuel tank cap to unlock and sends a refueling reminder to the driver.

[0076] S350: During the refueling process, the VCU receives the status of the fuel tank cap.

[0077] S360: The VCU determines whether the fuel tank cover is opened within the third preset time after the motor lock of the fuel tank cover is unlocked. If so, execute S370; otherwise, execute S380.

[0078] S370: If the fuel tank cover changes from a closed state to an open state, and then changes from an open state to a closed state, it indicates that a refueling operation has actually been performed, and the VCU controls the motor lock of the fuel tank cover to lock after a second preset delay, thereby completing the refueling operation.

[0079] S380: If the fuel tank cap remains in the closed state within the third preset time after the motor lock of the fuel tank cap is unlocked, from the perspective of safety, it can be determined that the refueling request is a misoperation by the driver or the driver actively abandons the refueling operation. In this case, the VCU actively controls the motor lock of the fuel tank cap to lock the fuel tank cap, so that the fuel tank cap is closed.

[0080] S390: Issue a parking and engine shutdown reminder to the driver. Return to S310.

[0081] As another embodiment, the high-pressure fuel tank control strategy for new energy vehicles provided in this application also includes a pressure protection function for the high-pressure fuel tank. Figure 4 As shown in the figure, the pressure protection functions of the high-pressure oil tank specifically include:

[0082] S410: The VCU receives the pressure signal of the pressure sensor of the high-pressure oil tank in real time.

[0083] S420: The VCU determines whether the pressure signal is greater than the upper pressure limit or whether the pressure signal is less than the lower pressure limit. If the pressure signal is greater than the upper pressure limit or the pressure signal is less than the lower pressure limit, execute S430; otherwise, return to S410.

[0084] S430: VCU controls the oil tank isolation valve FTIV to open, allowing the high-pressure oil tank to release or replenish pressure.

[0085] S440: The VCU determines whether the pressure signal is restored to between the upper pressure limit and the lower pressure limit. If so, execute S450; otherwise, return to S440.

[0086] S450: VCU controls the oil tank isolation valve to close.

[0087] As another embodiment, the high-pressure fuel tank control strategy for new energy vehicles provided in this application also includes an arrangement of priority order. Specifically, it includes:

[0088] P1: If the VCU simultaneously receives a pressure signal from the high-pressure tank that is greater than the upper pressure limit or a pressure signal that is less than the lower pressure limit, a leak diagnosis request from the engine management system, and a refueling request, the VCU will prioritize responding to the pressure signal that is greater than the upper pressure limit or the pressure signal that is less than the lower pressure limit.

[0089] P2: If the VCU receives both a leak diagnosis request and a refueling request from the engine management system, the VCU responds to the refueling request first.

[0090] P3: When the vehicle is not in sleep mode, if the VCU only receives a leak diagnosis request sent by the engine management system EMS, the VCU directly responds to the leak diagnosis request.

[0091] P4: During the leak diagnosis process of the high-pressure fuel tank, if the VCU receives a refueling request, the VCU interrupts the leak diagnosis operation and enters the refueling state; after the refueling is completed, it continues to respond to the leak diagnosis request.

[0092] Based on the above, the present application also provides a high-pressure fuel tank control system for new energy vehicles applied to the vehicle controller. Figure 5 As shown, the high-pressure oil tank control system includes a request receiving module 510 , a valve opening module 520 and a valve closing module 530 .

[0093] The request receiving module 510 is used to receive a leak diagnosis request and a leak diagnosis stop request sent by the engine management system.

[0094] The valve opening module 520 is used to control the fuel tank isolation valve to open when receiving a leakage diagnosis request sent by the engine management system.

[0095] The valve closing module 530 is used to control the fuel tank isolation valve to close when receiving a stop leakage diagnosis request sent by the engine management system.

[0096] Preferably, the high-pressure oil tank control system further includes a timing module 540, and the timing module 540 is used to time the opening time of the oil tank isolation valve.

[0097] The valve closing module 530 is used to actively control the fuel tank isolation valve to close when no leakage diagnosis stop request sent by the engine management system is received after a first preset time after the fuel tank isolation valve is opened.

[0098] Preferably, the request receiving module 510 is also used to receive a refueling request.

[0099] The high-pressure fuel tank control system also includes a refueling condition judgment module 550 , a pressure signal receiving module 560 , an unlocking module 570 , a prompt sending module 580 , a fuel tank cap state receiving module 590 and a locking module 5100 .

[0100] The refueling condition determination module 550 is used to determine whether the vehicle meets the refueling conditions after receiving a refueling request.

[0101] The valve opening module 520 is used to control the fuel tank isolation valve to open when a refueling request is received and the vehicle meets the refueling conditions, so as to release the pressure of the high-pressure fuel tank.

[0102] The pressure signal receiving module 560 is used to receive the pressure signal of the pressure sensor of the high-pressure oil tank.

[0103] The unlocking module 570 is used to control the motor lock of the fuel tank cover to unlock when the fuel tank pressure reaches a preset range.

[0104] The prompt sending module 580 is used to send a refueling reminder while controlling the motor lock of the fuel tank cover to unlock.

[0105] The fuel tank cap status receiving module 590 is used to receive the status of the fuel tank cap during the refueling process.

[0106] The locking module 5100 is used to control the motor lock of the fuel tank cover to lock after a second preset time delay when the fuel tank cover changes from an open state to a closed state.

[0107] Preferably, the timing module 540 is also used to start timing after the motor lock of the fuel tank cover is unlocked.

[0108] The locking module 5100 is also used to actively control the motor lock of the fuel tank cover to lock when the fuel tank cover remains in a closed state within a third preset time after the motor lock of the fuel tank cover is unlocked.

[0109] Preferably, the valve opening module 520 is also used to control the oil tank isolation valve to open when the pressure signal of the high-pressure oil tank is greater than the upper pressure limit or the pressure signal is less than the lower pressure limit, so as to relieve or replenish the pressure of the high-pressure oil tank.

[0110] The valve closing module 530 is used to control the oil tank isolation valve to close when the pressure signal recovers to between the upper pressure limit and the lower pressure limit.

[0111] Preferably, the high-pressure fuel tank control system also includes a priority response module 5110, which is used to prioritize responding to the pressure signal being greater than the upper pressure limit or the pressure signal being less than the lower pressure limit when simultaneously receiving a pressure signal from the high-pressure fuel tank greater than the upper pressure limit or the pressure signal being less than the lower pressure limit, a leakage diagnosis request sent by the engine management system, and a refueling request.

[0112] Preferably, the priority response module 5110 is also used to give priority to responding to the refueling request when a leakage diagnosis request and a refueling request sent by the engine management system are received at the same time.

[0113] Preferably, the priority response module 5110 is also used to interrupt the leakage diagnosis operation and enter the refueling state when receiving a refueling request during the leakage diagnosis process of the high-pressure oil tank, and continue to respond to the leakage diagnosis request after the refueling is completed.

[0114] Although some specific embodiments of the present application have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are only for illustration, not for limiting the scope of the present application. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A high-pressure fuel tank control strategy for new energy vehicles, characterized in that: Applied to the vehicle controller, the high-pressure fuel tank control strategy includes: In response to receiving a leak diagnosis request sent by an engine management system, controlling a fuel tank isolation valve to open, the fuel tank isolation valve being arranged between a high pressure fuel tank and a carbon canister; If a stop leakage diagnosis request sent by the engine management system is received within a first preset time after the fuel tank isolation valve is opened, the fuel tank isolation valve is controlled to be closed.

2. The high-pressure fuel tank control strategy for new energy vehicles according to claim 1 is characterized in that: If the stop leakage diagnosis request sent by the engine management system is not received after a first preset time after the fuel tank isolation valve is opened, the fuel tank isolation valve is actively controlled to be closed.

3. The high-pressure fuel tank control strategy for new energy vehicles according to claim 1 is characterized in that: Also includes: In response to receiving a refueling request, determining whether the vehicle meets a refueling condition; If yes, the oil tank isolation valve is controlled to open to release the pressure of the high-pressure oil tank; Receive a pressure signal from a pressure sensor of a high-pressure oil tank and determine whether the oil tank pressure reaches a preset range; If yes, the motor lock of the fuel tank cover is controlled to unlock and a refueling reminder is sent at the same time; During refueling, receive the status of the fuel tank cap; If the fuel tank cover changes from a closed state to an open state, and then changes from an open state to a closed state, the motor lock of the fuel tank cover is controlled to be locked after a delay of a second preset time.

4. The high-pressure fuel tank control strategy for new energy vehicles according to claim 3 is characterized in that: If the fuel tank cover remains in a closed state within a third preset time after the motor lock of the fuel tank cover is unlocked, the motor lock of the fuel tank cover is actively controlled to be locked.

5. The high-pressure fuel tank control strategy for new energy vehicles according to claim 1 is characterized in that: Also includes: Receive the pressure signal of the pressure sensor of the high-pressure oil tank in real time; If the pressure signal is greater than the upper pressure limit or the pressure signal is less than the lower pressure limit, the oil tank isolation valve is controlled to open, so that the high-pressure oil tank is depressurized or pressurized; If the pressure signal returns to between the upper pressure limit and the lower pressure limit, the oil tank isolation valve is controlled to close.

6. A high-pressure fuel tank control system for a new energy vehicle, characterized in that: Applied to the vehicle controller, the high-pressure fuel tank control system includes a request receiving module, a valve opening module and a valve closing module; The request receiving module is used to receive a leak diagnosis request and a stop leak diagnosis request sent by the engine management system; The valve opening module is used to control the fuel tank isolation valve to open upon receiving a leakage diagnosis request sent by the engine management system; The valve closing module is used to control the fuel tank isolation valve to close when receiving a stop leakage diagnosis request sent by the engine management system; Wherein, the oil tank isolation valve is arranged between the high-pressure oil tank and the carbon canister.

7. The high-pressure fuel tank control system for new energy vehicles according to claim 6 is characterized in that: Also included is a timing module, the timing module is used to time the opening time of the oil tank isolation valve; The valve closing module is used to actively control the fuel tank isolation valve to close when no stop leakage diagnosis request sent by the engine management system is received after a first preset time after the fuel tank isolation valve is opened.

8. The high-pressure fuel tank control system for new energy vehicles according to claim 7, characterized in that: The request receiving module is also used to receive a refueling request; The high-pressure fuel tank control system also includes a refueling condition judgment module, a pressure signal receiving module, an unlocking module, a prompt sending module, a fuel tank cover status receiving module and a locking module; The refueling condition determination module is used to determine whether the vehicle meets the refueling conditions after receiving the refueling request; The valve opening module is used to control the fuel tank isolation valve to open when a refueling request is received and the vehicle meets the refueling conditions, so as to release the pressure of the high-pressure fuel tank; The pressure signal receiving module is used to receive the pressure signal of the pressure sensor of the high-pressure oil tank; The unlocking module is used to control the motor lock of the fuel tank cover to unlock when the fuel tank pressure reaches a preset range; The reminder sending module is used to send a refueling reminder while controlling the motor lock of the fuel tank cover to unlock; The fuel tank cap status receiving module is used to receive the status of the fuel tank cap during the refueling process; The locking module is used to control the motor lock of the fuel tank cover to lock after a second preset time delay when the fuel tank cover changes from an open state to a closed state.

9. The high-pressure fuel tank control system for new energy vehicles according to claim 8, characterized in that: The timing module is also used to start timing after the motor lock of the fuel tank cover is unlocked; The locking module is also used to actively control the motor lock of the fuel tank cover to lock when the fuel tank cover remains in a closed state within a third preset time after the motor lock of the fuel tank cover is unlocked.

10. The high-pressure fuel tank control system for new energy vehicles according to claim 8, characterized in that: The valve opening module is also used to control the oil tank isolation valve to open when the pressure signal of the high-pressure oil tank is greater than the upper pressure limit or the pressure signal is less than the lower pressure limit, so as to release or replenish the pressure of the high-pressure oil tank; The valve closing module is used to control the oil tank isolation valve to close when the pressure signal returns to between the upper pressure limit and the lower pressure limit.

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