High-pressure oil tank pressure relief control method, device and equipment and storage medium

Abstract

The invention discloses a high-pressure oil tank pressure relief control method, device and equipment and a storage medium, and relates to the technical field of automobiles. The method comprises the steps that a refueling request is responded, a preset pressure threshold value is determined, and whether a vehicle is in a non-driving high-pressure state or not is detected; when the vehicle is in the non-driving high-pressure state, a fuel tank pressure relief valve is controlled to be opened to relieve pressure of a fuel tank, and oil gas is guided into a carbon canister; detecting the pressure of the fuel tank after pressure relief of the fuel tank is started, and judging whether the pressure is reduced to a preset pressure threshold value or not; when the pressure is reduced to the preset pressure threshold value, a refueling permission signal is sent to a door controller, a refueling port cover motor of the vehicle is driven to be unlocked so as to execute refueling operation, and the high-pressure oil tank pressure relief system hardware device is combined with multi-strategy software function integration; the fuel filling function of the plug-in mixing vehicle type is achieved, and the multi-dimensional requirements of emission control, fuel filling safety, good customer experience and the like are met.

Description

Technical Field

[0001] The present invention relates to the technical field of automobiles, and particularly to a method, device, equipment and storage medium for controlling the pressure relief of a high-pressure fuel tank. Background Art

[0002] Currently, plug-in hybrid vehicles have become an important development direction in the automotive industry due to their flexibility in both fuel-driven and pure-electric driving. In the design of a high-pressure fuel system, the pressure relief control of the fuel tank is a key link to ensure the safety and environmental performance of the vehicle.

[0003] Traditional pressure relief systems usually monitor the fuel tank pressure in real time through an electronic control unit (ECU), and when the driver triggers a refueling request, the fuel tank pressure relief valve (FTIV valve) is opened to introduce the oil and gas into the carbon canister for adsorption, so as to reduce the fuel tank pressure and allow refueling operations. However, in actual applications, when the FTIV valve fails to relieve pressure due to mechanical jamming or sensor failure, the system lacks an effective fault diagnosis mechanism and visual prompt. The driver cannot obtain the fault information in time and has no emergency operation guidance, which may lead to the inability to open the fuel filler cap and affect normal use.

[0004] The above content is only used to assist in understanding the technical solution of the present invention, and does not represent an admission that the above content is prior art. Summary of the Invention

[0005] The main object of the present invention is to provide a method, device, equipment and storage medium for controlling the pressure relief of a high-pressure fuel tank, aiming to solve the technical problem that the failure of FTIV pressure relief cannot be correctly diagnosed.

[0006] To achieve the above object, the present invention provides a method for controlling the pressure relief of a high-pressure fuel tank, and the method for controlling the pressure relief of the high-pressure fuel tank includes the following steps:

[0007] Respond to a refueling request, determine a preset pressure threshold, and detect whether the vehicle is in a non-driving high-pressure state;

[0008] When the vehicle is in the non-driving high-pressure state, control the fuel tank pressure relief valve to open to relieve the pressure of the fuel tank, and introduce the oil and gas into the carbon canister;

[0009] After the pressure relief of the fuel tank starts, detect the pressure of the fuel tank, and determine whether the pressure drops to the preset pressure threshold;

[0010] When the pressure drops to the preset pressure threshold, send a refueling permission signal to the door controller to drive the fuel filler cap motor of the vehicle to unlock for refueling operations.

[0011] In an embodiment, after the step of detecting the pressure of the fuel tank after the pressure relief of the fuel tank starts and determining whether the pressure drops to the preset pressure threshold, the method further includes:

[0012] When the pressure has not dropped to the preset pressure threshold, it is determined that there is a pressure relief failure in the fuel tank;

[0013] Control the fuel tank pressure relief valve to open and close continuously for a preset number of times to solve the pressure relief failure;

[0014] When the pressure still has not dropped to the preset pressure threshold, enable the emergency mode to open the fuel tank cap to relieve the pressure of the refueling port rotary cap and refuel at a slow speed.

[0015] In one embodiment, after the step of driving the motor of the fuel tank cap of the vehicle to unlock to perform the refueling operation, it further includes:

[0016] When it is detected that the fuel tank cap is closed and no request to open the fuel tank cap again is detected within the first preset duration, drive the motor to lock and close the fuel tank pressure relief valve;

[0017] When a request to open the fuel tank cap again is detected within the first preset duration, reset the timing and control the fuel tank cap to open again.

[0018] In one embodiment, after the step of detecting whether the vehicle is in a non-driving high-voltage state, it further includes:

[0019] When the vehicle is in a driving high-voltage state, obtain the vehicle driving mode and the fuel tank pressure in real time;

[0020] When it is detected that the vehicle driving mode is a pure electric mode, keep the fuel tank pressure relief valve closed to seal the oil and gas in the fuel tank;

[0021] When the fuel tank pressure rises to the one-way physical opening threshold, open the fuel tank pressure relief valve to introduce the oil and gas into the carbon canister;

[0022] When it is detected that the vehicle driving mode is a hybrid mode and the engine is in an operating state, dynamically adjust the opening degrees of the fuel tank pressure relief valve and the carbon canister solenoid valve based on the engine combustion model control requirements, and introduce the oil and gas into the engine combustion to reduce the fuel tank pressure.

[0023] In one embodiment, the method further includes:

[0024] When it is detected that the refueling operation is completed, the fuel tank cap is not closed, and the vehicle speed is greater than the preset vehicle speed, prompt the driver through the instrument that the fuel tank cap is not closed, drive the fuel tank pressure relief valve to close, and close the fuel tank cap opening permission signal.

[0025] In one embodiment, the step of responding to the refueling request and determining the preset pressure threshold includes:

[0026] In response to a refueling request, obtain historical fuel tank pressure test data;

[0027] Determine a sample statistical value based on the historical fuel tank pressure test data;

[0028] Determine a preset pressure threshold based on the sample statistical value.

[0029] In one embodiment, the method further includes:

[0030] After the fuel filler cap of the vehicle is unlocked, keep the fuel tank pressure relief valve open for a second preset duration and maintain the CAN network in a wake-up state to perform a refueling operation.

[0031] In addition, to achieve the above object, the present invention also provides a high-pressure fuel tank pressure relief control device, which includes:

[0032] A first detection module, configured to respond to a refueling request, determine a preset pressure threshold, and detect whether the vehicle is in a non-driving high-pressure state;

[0033] A pressure relief module, configured to control the fuel tank pressure relief valve to open for fuel tank pressure relief and introduce the oil and gas into the carbon canister when the vehicle is in the non-driving high-pressure state;

[0034] A second detection module, configured to detect the pressure of the fuel tank after the fuel tank pressure relief starts and determine whether the pressure drops to the preset pressure threshold;

[0035] A refueling module, configured to send a refueling permission signal to the door controller when the pressure drops to the preset pressure threshold, and drive the fuel filler cap motor of the vehicle to unlock to perform a refueling operation.

[0036] In addition, to achieve the above object, the present invention also provides a high-pressure fuel tank pressure relief control device, which includes: a memory, a processor, and a high-pressure fuel tank pressure relief control program stored on the memory and executable on the processor, and the high-pressure fuel tank pressure relief control program is configured to implement the steps of the high-pressure fuel tank pressure relief control method as described above.

[0037] In addition, to achieve the above object, the present invention also provides a storage medium, on which a high-pressure fuel tank pressure relief control program is stored, and when the high-pressure fuel tank pressure relief control program is executed by a processor, it implements the steps of the high-pressure fuel tank pressure relief control method as described above.

[0038] In addition, to achieve the above object, the present application also provides a computer program product, which includes a computer program, and when the computer program is executed by a processor, it implements the steps of the high-pressure fuel tank pressure relief control method as described above.

[0039] One or more technical solutions proposed in this application have at least the following technical effects:

[0040] First, respond to the refueling request and detect whether the vehicle is in a non-driving high-voltage state to ensure that the pressure relief operation is only carried out under safe working conditions; then, dynamically set the threshold according to historical pressure data, control the opening of the fuel tank pressure relief valve (FTIV valve), and use the pressure difference between the fuel tank and the carbon canister to quickly introduce the oil and gas into the carbon canister; monitor the pressure change in real time, and accurately determine the pressure relief completion state in combination with the dynamic threshold (such as 28 - 31 kPa ± 4 kPa) to reduce the risk of misjudgment caused by sensor errors; immediately send a refueling permission signal through the CAN network after successful pressure relief, drive the fuel filler door motor to unlock, and achieve fast response. If the pressure relief fails, the system triggers a fault diagnosis within 10 seconds, and forms a closed-loop processing through the restart of the FTIV valve, the activation of the standby pressure relief path, and the restriction of the vehicle driving mode to ensure safety. Considering the detection of non-driving high-voltage state, dynamic threshold adaptation, multi-scenario coverage (such as leaving midway and repeated refueling), and fault emergency response, while ensuring the airtightness of the oil and gas, it significantly improves the operation efficiency and system robustness, and solves the defects of the traditional pressure relief system in terms of fault handling, environmental compatibility, and user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The accompanying drawings here are incorporated into the specification and form a part of this specification, showing the embodiments consistent with this application, and are used together with the specification to explain the principles of this application.

[0042] In order to more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0043] Figure 1 It is a schematic flowchart provided for the first embodiment of the high-pressure fuel tank pressure relief control method of this application;

[0044] Figure 2 It is a schematic flowchart provided for the second embodiment of the high-pressure fuel tank pressure relief control method of this application;

[0045] Figure 3 It is a schematic flowchart provided for the third embodiment of the high-pressure fuel tank pressure relief control method of this application;

[0046] Figure 4 It is a schematic module structure diagram of the high-pressure fuel tank pressure relief control device for the embodiment of this application;

[0047] Figure 5 It is a schematic device structure diagram of the hardware operating environment involved in the high-pressure fuel tank pressure relief control method for the embodiment of this application.

[0048] The implementation, functional features, and advantages of this application will be further described in conjunction with embodiments and with reference to the accompanying drawings. Specific Embodiments

[0049] It should be understood that the specific embodiments described herein are only used to explain the technical solutions of this application and are not used to limit this application.

[0050] To better understand the technical solutions of this application, the following will be described in detail in conjunction with the accompanying drawings of the specification and specific implementation manners.

[0051] It should be noted that the execution subject of this embodiment can be a computing service device with data processing, network communication, and program running functions, such as a tablet computer, a personal computer, a mobile phone, etc., or an electronic device, a high-pressure fuel tank pressure relief control device, a vehicle networking platform, etc. that can implement the above functions. The following takes the high-pressure fuel tank pressure relief control device as an example to illustrate this embodiment and the following embodiments.

[0052] Based on this, the embodiments of this application provide a high-pressure fuel tank pressure relief control method, with reference to Figure 1 , Figure 1 which is a schematic flowchart of the first embodiment of the high-pressure fuel tank pressure relief control method of this application.

[0053] In this embodiment, the high-pressure fuel tank pressure relief control method includes steps S10 to S40:

[0054] Step S10, in response to a refueling request, determine a preset pressure threshold and detect whether the vehicle is in a non-driving high-pressure state;

[0055] It should be noted that the preset pressure threshold refers to a pressure standard value preset during the response to the refueling request. During refueling operations, the fuel system pressure needs to be strictly controlled within a safe range, and this threshold is used as a judgment basis to ensure appropriate pressure.

[0056] The high-pressure fuel tank pressure relief control system of this strategy consists of a vehicle controller, a door controller, an instrument panel, a high-pressure fuel tank, an FTIV pressure relief component, a vehicle CAN network, and a fuel filler cap assembly. The vehicle controller is the system center, integrating vehicle control and engine operation control. In the fuel tank pressure relief function, it collects the fuel tank pressure sensor, drives the FTIV valve and the charcoal canister desorption circuit; the door controller collects the refueling switch signal and the fuel filler cap status signal, and drives the fuel filler cap motor; the fuel filler cap assembly integrates a micro switch and a motor lock body; the information transmission between the vehicle controller, the door controller, and the instrument panel is transmitted through the CAN network.

[0057] It should be understood that the engine starting condition is associated with the vehicle running high voltage. The engine is prohibited from starting under non-vehicle running high voltage. At the same time, the refueling operation needs to be performed under non-vehicle running high voltage to ensure refueling safety. The vehicle controller monitors the triggering status of the refueling switch. If the driver presses the refueling switch under the vehicle running high voltage state, the instrument will prompt the driver to perform the refueling operation in the non-ready state.

[0058] In a feasible implementation manner, step S10 includes steps A11 to A13:

[0059] Step A11: Respond to the refueling request and obtain the historical fuel tank pressure test data;

[0060] In a specific implementation, take the historical pressure data (such as the test results of multiple sample vehicles) to provide a statistical basis for setting the threshold value. Obtain the historical pressure curve through the on-vehicle storage module or the cloud database to cover different temperature, fuel type, and hardware error scenarios.

[0061] Step A12: Determine the sample statistical value based on the historical fuel tank pressure test data;

[0062] In a specific implementation, calculate statistical quantities such as the average value and standard deviation of the pressure data to quantify the system error range. If the mean value of the historical data is 30 kPa and the standard deviation is 1 kPa, the statistical sample value can be set to 30 ± 4 kPa (covering the 3σ range).

[0063] Step A13: Determine the preset pressure threshold based on the sample statistical value.

[0064] It should be noted that due to the assembly and manufacturing scatter of the fuel system components and the test error of the fuel tank pressure sensor, after the vehicle controller drives the FTIV valve to release pressure until the high-pressure fuel tank is open to the atmosphere, the test value of the pressure sensor will fluctuate within a certain range. To avoid misjudgment by the vehicle controller that the pressure relief of the high-pressure fuel tank is not completed due to this fluctuation, the pressure relief completion threshold should be set slightly higher than the majority of the sample statistical values (usually around ±4 kPa).

[0065] It should be understood that ±4 kPa means that after the driver presses the refueling switch, the FTIV valve opens to release pressure and discharges the oil and gas pressure in the fuel tank into the carbon canister. When the pressure in the fuel tank drops to within 4 kPa relative to the atmospheric pressure, it is considered that the pressure relief is completed. Theoretically, it should drop to 0 kPa. The reason for taking the value of ±4 kPa relative to the atmospheric pressure is to take into account the zero drift accuracy of the fuel tank pressure sensor itself and the deviation of the oil circuit system.

[0066] Step S20, when the vehicle is in the non-vehicle running high voltage state, control the fuel tank pressure relief valve to open to relieve the fuel tank pressure and introduce the oil and gas into the carbon canister;

[0067] It should be noted that by opening the fuel tank pressure relief valve (FTIV valve) to connect the fuel tank and the carbon canister, the pressure can be quickly released.

[0068] The vehicle controller drives the FTIV valve to fully open, maximizing the valve port area to accelerate pressure relief; the pressure difference between the fuel tank (with the initial pressure ranging from 0 to 35 kPa relative to the atmospheric pressure) and the carbon canister drives the flow of oil and gas.

[0069] In a specific implementation, when the driver presses the fuel filling switch in a non-driving high-pressure state, the vehicle controller receives a valid fuel filling request and will open the FTIV valve to perform the fuel tank pressure relief operation, and the oil and gas are introduced into the carbon canister and adsorbed.

[0070] Step S30: After the fuel tank pressure relief starts, detect the pressure of the fuel tank and determine whether the pressure has dropped to a preset pressure threshold;

[0071] It should be noted that the pressure relief progress is monitored in real time to ensure that the pressure is safely up to standard before the fuel filling operation.

[0072] In a specific implementation, the fuel tank pressure sensor collects data at a period of 0.1 second and transmits it to the controller through the CAN network; if the pressure drops to the threshold range (0 - ±4 kPa relative to the atmospheric pressure) within 10 seconds, it is determined that the pressure relief is successful; if the standard is not met after the time limit, the fault diagnosis process is triggered.

[0073] The system monitors the fuel tank pressure within 10 s after driving the FTIV valve to execute the pressure relief instruction. If the pressure drop effect is much lower than expected, it will be judged that there is a fault in the pressure relief system, and the fault prompt information will be transmitted to the instrument through the CAN network to guide the driver to use emergency operation to refuel and check and repair the fault.

[0074] In a feasible implementation manner, after step S30, it further includes steps A21 to A23:

[0075] Step A21: When the pressure has not dropped to the preset pressure threshold, determine that there is a pressure relief fault in the fuel tank;

[0076] In a specific implementation, for example, within 10 s after the valid fuel filling request is triggered and the vehicle controller executes driving the FITV valve for pressure relief, if it is still detected that the fuel tank pressure has not dropped to the pressure relief completion threshold, it is determined that there are faults such as physical jamming of the FITV valve.

[0077] It should be noted that at this time, the driver can be informed through the instrument text that there is a fault in the fuel filling pressure relief system and prompted to repair. In this special case, the driver can open the fuel tank cap and forcibly open the fuel filling cap for pressure relief and slow-speed fuel filling through the emergency opening method.

[0078] Step A22: Control the fuel tank pressure relief valve to open and close continuously for a preset number of times to solve the pressure relief fault;

[0079] In specific implementation, attempt to clear the valve body jamming (such as oil adhesion), switch the valve body 3 times at a frequency of 1 Hz, with an interval of 100 ms for each opening and closing, and use mechanical vibration to relieve the jamming.

[0080] Step A23: When the pressure still has not dropped to the preset pressure threshold, enable the emergency mode to open the fuel tank cap to relieve the pressure of the refueling port rotary cap and refuel at a slow speed.

[0081] It should be noted that in this special case, the driver can open the fuel tank opening cover through the emergency opening method and forcefully open the refueling port rotary cap to relieve the pressure and refuel at a slow speed.

[0082] Step S40, when the pressure drops to the preset pressure threshold, send a refueling permission signal to the door controller to drive the unlocking of the fuel tank cap motor of the vehicle to perform the refueling operation.

[0083] In specific implementation, the vehicle control unit (VCU) monitors the fuel tank pressure in real time. When it is monitored that the fuel tank pressure ≤ the set threshold, it is considered that the pressure relief is completed (this process usually takes within 1 s), and a refueling permission signal is sent to the door controller. After receiving the signal, the door controller drives the door lock motor to unlock. The driver can open the fuel tank cap door and open the rotary cap to perform the refueling operation.

[0084] Further, when it is detected that the refueling operation is completed, the fuel tank cap is not closed, and the vehicle speed is greater than the preset vehicle speed, the driver is prompted through the instrument that the fuel tank cap is not closed, and the fuel tank pressure relief valve is driven to close (the opening of the valve body caused by non-refueling requirements is an exceptional case), and the refueling port cover opening permission signal is closed.

[0085] In specific implementation, if the driver forgets to close the fuel tank cover after refueling and drives the vehicle away, when the door controller monitors that the vehicle speed ≥ the set threshold, the driver is prompted through the instrument that the fuel tank cover is not closed. At the same time, the vehicle control unit (VCU) will drive the FTIV valve to close and close the refueling port cover opening permission signal.

[0086] Still further, after the fuel tank cap of the vehicle is unlocked, keep the fuel tank pressure relief valve open for a second preset duration and maintain the CAN network in the wake-up state to perform the refueling operation.

[0087] It should be noted that the second preset duration can be 30 min.

[0088] In specific implementation, if the FTIV valve closes during the refueling process, the pressure formed by the fuel surging into the refueling pipeline during the refueling process cannot be discharged in time, which will cause the refueling nozzle to jump. Therefore, to ensure the smoothness of the refueling process, the vehicle control unit (VCU) will continuously control the FTIV valve to open. If the driver does not refuel immediately after the fuel tank cap motor is unlocked, the vehicle control unit (VCU) will control the FTIV valve to remain open for 30 min, and the CAN network will remain in the wake-up state. This design can cover common scenarios such as the driver going to recharge the fuel card first and then refueling.

[0089] This embodiment provides a method for controlling the pressure relief of a high-pressure fuel tank. In response to a refueling request, a preset pressure threshold is determined and it is detected whether the vehicle is in a non-driving high-voltage state. When the vehicle is in the non-driving high-voltage state, the fuel tank pressure relief valve is controlled to open to relieve the pressure of the fuel tank, and the oil and gas are introduced into the carbon canister. After the pressure relief of the fuel tank starts, the pressure of the fuel tank is detected, and it is determined whether the pressure drops to the preset pressure threshold. When the pressure drops to the preset pressure threshold, a refueling permission signal is sent to the door controller to drive the unlocking of the fuel tank lid motor of the vehicle to perform the refueling operation. Through the combination of the high-pressure fuel tank pressure relief system hardware device and the multi-strategy software function integration, the refueling function of the plug-in hybrid vehicle model meets the multi-dimensional requirements such as emission control, refueling safety, and good customer experience.

[0090] Based on the first embodiment of the present application, in the second embodiment of the present application, the same or similar content as in the above-mentioned embodiment one can be referred to the above introduction and will not be elaborated hereinafter. On this basis, please refer to Figure 2 , after step S20, steps S201 to S204 are further included:

[0091] Step S201, when the vehicle is in the driving high-voltage state, the driving mode of the vehicle and the fuel tank pressure are obtained in real time;

[0092] It should be noted that when the vehicle is in the driving high-voltage state, the driving mode and the fuel tank pressure are monitored in real time to provide a basis for dynamic pressure relief control. The driving high-voltage state means that the vehicle power battery is in a high-voltage working state (such as the drive motor running, fast charging mode). At this time, it is necessary to avoid high-voltage circuit interference with the pressure relief operation.

[0093] In specific implementation, the driving mode (pure electric / hybrid) and the fuel tank pressure value are obtained synchronously through the CAN network, and the sampling frequency is not less than 10Hz.

[0094] Step S202, when it is detected that the driving mode of the vehicle is the pure electric mode, keep the fuel tank pressure relief valve closed to keep the oil and gas sealed in the fuel tank;

[0095] In specific implementation, if the vehicle is driving in the pure electric state, the vehicle controller will keep the FTIV valve closed, and the oil and gas are sealed in the high-pressure fuel tank to avoid continuous overflow to break through the carbon canister and flow into the atmosphere to pollute the environment. The high-pressure fuel tank can withstand a maximum pressure of about 35kpa;

[0096] Step S203, when the fuel tank pressure rises to the one-way physical opening threshold, open the fuel tank pressure relief valve to introduce the oil and gas into the carbon canister;

[0097] In specific implementation, if the oil and gas pressure continues to rise to the pressure relief range (usually 28 - 31kpa), the FTIV valve will be physically opened unidirectionally, and the oil and gas will be relieved to the carbon canister.

[0098] It should be noted that 28 - 31 kPa refers to the threshold at which the fuel tank check valve opens. The function of this valve is to protect the fuel pressure inside the high - pressure fuel tank from accumulating to a level that exceeds the tolerance limit of the high - pressure fuel tank itself. It is a physical protection switch and always exists.

[0099] Step S204: When it is detected that the vehicle driving mode is the hybrid mode and the engine is in the running state, dynamically adjust the opening degrees of the fuel tank pressure relief valve and the canister solenoid valve based on the engine combustion model control requirements, and introduce the oil - gas mixture into the engine combustion to reduce the fuel tank pressure.

[0100] In a specific implementation, if the vehicle is driving in a hybrid mode and the engine is in the working state, the vehicle control unit will open the FTIV valve and the canister solenoid valve in a timely manner according to the engine operating conditions to introduce the oil - gas mixture into the engine intake for combustion, reducing the oil - gas pressure in the high - pressure fuel tank.

[0101] This embodiment provides a method for controlling the pressure relief of a high - pressure fuel tank. When the vehicle is driving, the fuel tank pressure relief valve is kept closed in the pure - electric mode, so that the oil - gas mixture is sealed in the high - pressure fuel tank, which can prevent the oil - gas from overflowing to the canister and then flowing into the atmosphere, effectively reducing air pollution. In the hybrid mode, when the engine is running, the opening degrees of the pressure relief valve and the canister solenoid valve can be dynamically adjusted according to the intake demand, introducing the oil - gas mixture into the engine combustion, which not only reduces the fuel tank pressure but also makes full use of the oil - gas mixture and reduces exhaust emissions.

[0102] Based on the first embodiment and the second embodiment of the present application, in the third embodiment of the present application, for the same or similar content as the above - mentioned embodiments, reference can be made to the above introduction and will not be elaborated hereinafter. On this basis, please refer to Figure 3 , after step S40, it further includes steps S401 - S402:

[0103] S401: When it is detected that the fuel filler cap is closed and no request to open the fuel filler cap again is detected within the first preset duration, lock the drive motor and close the fuel tank pressure relief valve;

[0104] In a specific implementation, after the driver finishes refueling and closes the fuel filler cap cover, the door control unit monitors that the state of the fuel filler cap cover changes from open to closed, and will lock the fuel filler cap drive motor after counting for 5 s. The vehicle control unit closes the FTIV valve and the refueling permission signal after counting for 10 s after detecting that the fuel filler cap is closed or immediately after the fuel filler cap drive motor is locked, and the pressure relief system works in a closed - loop manner.

[0105] S402: When a request to open the fuel filler cap again is detected within the first preset duration, reset the timing and control the fuel filler cap to open again.

[0106] It should be noted that the first preset duration can be 5 s;

[0107] In a specific implementation, after the driver finishes refueling and closes the fuel filler door cover, if the cover is opened again before the 5-second count is completed, the count of the door control and the vehicle controller will be reset, and the driver can still perform the refueling operation. This design can cover scenarios such as when the driver forgets to tighten the fuel filler cap or changes their mind and repeats the refueling.

[0108] Furthermore, after the driver closes the fuel filler door cover and locks the vehicle with the car key, the door controller will no longer count for 5 seconds and will immediately perform the locking action on the fuel filler door motor.

[0109] This embodiment provides a method for controlling the pressure relief of a high-pressure fuel tank. When it is detected that the fuel filler door is closed and no re-opening request is detected within the first preset duration, the driving motor is locked and the fuel tank pressure relief valve is closed, which can effectively prevent oil and gas leakage and avoid safety accidents such as fires or explosions caused by oil and gas leakage, thus ensuring the safety of the vehicle and personnel. Moreover, when the driver closes the fuel filler door cover and locks the vehicle with the car key, the door controller immediately performs the locking action on the fuel filler door motor, further enhancing the safety of the vehicle.

[0110] It should be noted that the above examples are only for understanding this application and do not constitute a limitation on the method for controlling the pressure relief of the high-pressure fuel tank of this application. Based on this technical concept, more forms of simple transformations are within the protection scope of this application.

[0111] This application also provides a device for controlling the pressure relief of a high-pressure fuel tank. Please refer to Figure 4 The device for controlling the pressure relief of a high-pressure fuel tank includes:

[0112] The first detection module 10 is used to respond to a refueling request, determine a preset pressure threshold, and detect whether the vehicle is in a non-driving high-pressure state;

[0113] The pressure relief module 20 is used to control the opening of the fuel tank pressure relief valve to relieve the pressure of the fuel tank and introduce the oil and gas into the carbon canister when the vehicle is in a non-driving high-pressure state;

[0114] The second detection module 30 is used to detect the pressure of the fuel tank after the fuel tank pressure relief starts and determine whether the pressure drops to the preset pressure threshold;

[0115] The refueling module 40 is used to send a refueling permission signal to the door controller when the pressure drops to the preset pressure threshold, and drive the fuel filler door motor of the vehicle to unlock to perform the refueling operation.

[0116] The high-pressure fuel tank pressure relief control device provided by this application adopts the high-pressure fuel tank pressure relief control method in the above-mentioned embodiment, which can solve the technical problem of inability to correctly diagnose the failure of FTIV pressure relief. Compared with the prior art, the beneficial effects of the high-pressure fuel tank pressure relief control device provided by this application are the same as those of the high-pressure fuel tank pressure relief control method provided by the above-mentioned embodiment, and other technical features in the high-pressure fuel tank pressure relief control device are the same as the features disclosed in the above-mentioned embodiment method, which will not be elaborated here.

[0117] In one embodiment, the second detection module 30 is further configured to determine that a pressure relief failure occurs in the fuel tank when the pressure does not drop to a preset pressure threshold;

[0118] Control the fuel tank pressure relief valve to open and close continuously for a preset number of times to solve the pressure relief failure;

[0119] When the pressure still does not drop to the preset pressure threshold, enable the emergency mode to open the fuel tank cap to relieve the pressure of the refueling port rotary cap and refuel at a slow speed.

[0120] In one embodiment, the refueling module 40 is further configured to drive the motor to lock and close the fuel tank pressure relief valve when it detects that the fuel tank cap is closed and no request to open the fuel tank cap again is detected within the first preset duration;

[0121] When a request to open the fuel tank cap again is detected within the first preset duration, reset the timing and control the fuel tank cap to open again.

[0122] In one embodiment, the pressure relief module 20 is further configured to continuously obtain the vehicle driving mode and the fuel tank pressure when the vehicle is in the driving high-pressure state;

[0123] When it detects that the vehicle driving mode is the pure electric mode, keep the fuel tank pressure relief valve closed to keep the oil and gas sealed in the fuel tank;

[0124] When the fuel tank pressure rises to the one-way physical opening threshold, open the fuel tank pressure relief valve to introduce the oil and gas into the carbon canister;

[0125] When it detects that the vehicle driving mode is the hybrid mode and the engine is in the running state, dynamically adjust the opening degrees of the fuel tank pressure relief valve and the carbon canister solenoid valve based on the engine intake demand, and introduce the oil and gas into the engine for combustion to reduce the fuel tank pressure.

[0126] In one embodiment, the first detection module 10 is further configured to, when it detects that the refueling operation is completed, the fuel tank cap is not closed, and the vehicle speed is greater than the preset vehicle speed, prompt the driver through the instrument that the fuel tank cap is not closed, and drive the fuel tank pressure relief valve to close, and close the fuel tank cap opening permission signal.

[0127] In one embodiment, the refueling module 40 is further configured to respond to a refueling request and obtain historical fuel tank pressure test data;

[0128] Determine a sample statistical value based on the historical fuel tank pressure test data;

[0129] Determine a preset pressure threshold based on the sample statistical value.

[0130] In one embodiment, the refueling module 40 is further configured to, after the fuel filler door of the vehicle is unlocked, keep the fuel tank pressure relief valve open for a second preset duration and maintain the CAN network in a wake-up state to perform a refueling operation.

[0131] The present application provides a high-pressure fuel tank pressure relief control device, which includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein, the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the high-pressure fuel tank pressure relief control method in the first embodiment above.

[0132] Reference is made below to Figure 5 , which shows a schematic structural diagram of a high-pressure fuel tank pressure relief control device suitable for implementing the embodiments of the present application. The high-pressure fuel tank pressure relief control device in the embodiments of the present application may include, but is not limited to, mobile terminals such as mobile phones, laptop computers, digital broadcast receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Descriptions: tablet computers), PMPs (Portable Media Players), in-vehicle terminals (such as in-vehicle navigation terminals), etc., and fixed terminals such as digital TVs, desktop computers, etc. Figure 5 The high-pressure fuel tank pressure relief control device shown is only an example and should not impose any limitation on the functions and usage scope of the embodiments of the present application.

[0133] As Figure 5As shown, the high-pressure fuel tank pressure relief control device may include a processing device 1001 (such as a central processing unit, a graphics processing unit, etc.), which may perform various appropriate actions and processes according to a program stored in a ROM (Read Only Memory) 1002 or a program loaded from a storage device 1003 into a RAM (Random Access Memory) 1004. In the RAM 1004, various programs and data required for the operation of the high-pressure fuel tank pressure relief control device are also stored. The processing device 1001, the ROM 1002, and the RAM 1004 are connected to each other through a bus 1005. An input / output (I / O) interface 1006 is also connected to the bus. Generally, the following systems may be connected to the I / O interface 1006: an input device 1007 including, for example, a touch screen, a touchpad, a keyboard, a mouse, an image sensor, a microphone, an accelerometer, a gyroscope, etc.; an output device 1008 including, for example, a liquid crystal display (LCD: Liquid Crystal Display), a speaker, a vibrator, etc.; a storage device 1003 including, for example, a magnetic tape, a hard disk, etc.; and a communication device 1009. The communication device 1009 may allow the high-pressure fuel tank pressure relief control device to communicate with other devices wirelessly or wiredly to exchange data. Although the figure shows a high-pressure fuel tank pressure relief control device having various systems, it should be understood that it is not required to implement or have all the shown systems. More or fewer systems may be implemented or had alternatively.

[0134] In particular, according to the embodiments disclosed in the present application, the processes described above with reference to the flowcharts may be implemented as computer software programs. For example, the embodiments disclosed in the present application include a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program includes program codes for performing the methods shown in the flowcharts. In such an embodiment, the computer program may be downloaded and installed from a network through the communication device, or installed from the storage device 1003, or installed from the ROM 1002. When the computer program is executed by the processing device 1001, the above-mentioned functions defined in the methods of the embodiments disclosed in the present application are executed.

[0135] The high-pressure fuel tank pressure relief control device provided by the present application adopts the high-pressure fuel tank pressure relief control method in the above-mentioned embodiment, and can solve the technical problem of being unable to correctly diagnose the failure of FTIV pressure relief. Compared with the prior art, the beneficial effects of the high-pressure fuel tank pressure relief control device provided by the present application are the same as those of the high-pressure fuel tank pressure relief control method provided by the above-mentioned embodiment, and other technical features in the high-pressure fuel tank pressure relief control device are the same as those disclosed in the method of the previous embodiment, and will not be elaborated here.

[0136] It should be understood that each part disclosed in this application can be implemented by hardware, software, firmware, or a combination thereof. In the description of the above embodiments, specific features, structures, materials, or characteristics can be combined in a suitable manner in any one or more embodiments or examples.

[0137] As described above, the above are only specific embodiments of this application, but the protection scope of this application is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in this application, and all of them should be covered by the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

[0138] This application provides a computer-readable storage medium having computer-readable program instructions (i.e., computer programs) stored thereon, and the computer-readable program instructions are used to execute the high-pressure fuel tank pressure relief control method in the above embodiments.

[0139] The computer-readable storage medium provided by this application can be, for example, a USB flash drive, but is not limited to electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices, or any combination of the above. More specific examples of computer-readable storage media can include, but are not limited to: electrical connections with one or more wires, portable computer disks, hard disks, RAM (Random Access Memory), ROM (Read Only Memory), EPROM (Erasable Programmable Read Only Memory or flash memory), optical fibers, CD-ROM (CD-Read Only Memory, portable compact disk read-only memory), optical storage devices, magnetic storage devices, or any suitable combination of the above. In this embodiment, the computer-readable storage medium can be any tangible medium that contains or stores a program, and this program can be used by or combined with an instruction execution system, device, or device. The program code contained on the computer-readable storage medium can be transmitted by any appropriate medium, including but not limited to: wires, optical cables, RF (Radio Frequency), etc., or any suitable combination of the above.

[0140] The above computer-readable storage medium can be included in the high-pressure fuel tank pressure relief control device; it can also exist independently and not be assembled into the high-pressure fuel tank pressure relief control device.

[0141] The above computer-readable storage medium carries one or more programs which, when executed by the high-pressure fuel tank pressure relief control device, cause the high-pressure fuel tank pressure relief control device to: respond to a refueling request, determine a preset pressure threshold, and detect whether the vehicle is in a non-driving high-pressure state; when the vehicle is in the non-driving high-pressure state, control the fuel tank pressure relief valve to open to relieve the pressure of the fuel tank, and introduce the oil and gas into the carbon canister; detect the pressure of the fuel tank after the fuel tank pressure relief starts, and determine whether the pressure drops to the preset pressure threshold; when the pressure drops to the preset pressure threshold, send a refueling permission signal to the door controller to drive the unlocking of the fuel filler door motor of the vehicle to perform a refueling operation.

[0142] Computer program code for performing the operations of the present application may be written in one or more programming languages or combinations thereof. The programming languages include object-oriented programming languages such as Java, Smalltalk, C++, and also include conventional procedural programming languages such as the "C" language or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, executed as a stand-alone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a LAN (Local Area Network) or a WAN (Wide Area Network), or may be connected to an external computer (e.g., through the Internet using an Internet service provider).

[0143] The flowcharts and block diagrams in the accompanying drawings illustrate the possible architectures, functions, and operations of systems, methods, and computer program products according to various embodiments of the present application. In this regard, each block in the flowchart or block diagram may represent a module, a program segment, or a part of code that contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than marked in the accompanying drawings. For example, two consecutive blocks shown may actually be executed substantially in parallel, and they may sometimes be executed in the reverse order, depending on the functions involved. It should also be noted that each block in the block diagram and / or flowchart, and the combination of blocks in the block diagram and / or flowchart, may be implemented by a dedicated hardware-based system for performing the specified functions or operations, or may be implemented by a combination of dedicated hardware and computer instructions.

[0144] The modules involved in the embodiments of this application can be implemented in software or in hardware. In some cases, the name of the module does not constitute a limitation on the unit itself.

[0145] The readable storage medium provided by this application is a computer-readable storage medium. The computer-readable storage medium stores computer-readable program instructions (i.e., computer programs) for executing the above-mentioned high-pressure fuel tank pressure relief control method, which can solve the technical problem of being unable to correctly diagnose the failure of FTIV pressure relief. Compared with the prior art, the beneficial effects of the computer-readable storage medium provided by this application are the same as those of the high-pressure fuel tank pressure relief control method provided by the above embodiments, and will not be elaborated here.

[0146] This application also provides a computer program product, including a computer program, and the steps of the above-mentioned high-pressure fuel tank pressure relief control method are implemented when the computer program is executed by a processor.

[0147] The computer program product provided by this application can solve the technical problem of being unable to correctly diagnose the failure of FTIV pressure relief. Compared with the prior art, the beneficial effects of the computer program product provided by this application are the same as those of the high-pressure fuel tank pressure relief control method provided by the above embodiments, and will not be elaborated here.

[0148] The above are only some embodiments of this application, and do not limit the patent scope of this application. Any equivalent structural transformation made under the technical concept of this application by using the content of the specification and drawings of this application, or any direct / indirect application in other related technical fields, is included in the patent protection scope of this application.

Claims

1. A high-pressure oil tank pressure relief control method, characterized in that: The high-pressure oil tank pressure relief control method comprises the following steps: In response to a refueling request, determining a preset pressure threshold and detecting whether the vehicle is in a non-driving high pressure state; When the vehicle is in the non-driving high-pressure state, controlling the fuel tank pressure relief valve to open to relieve the pressure of the fuel tank and guide the oil and gas into the carbon canister; detecting the pressure of the fuel tank after the fuel tank pressure relief begins, and determining whether the pressure drops to the preset pressure threshold; When the pressure drops to the preset pressure threshold, a refueling permission signal is sent to the door controller to drive the fuel filler cap motor of the vehicle to unlock to perform a refueling operation.

2. The high pressure oil tank pressure relief control method according to claim 1, characterized in that: After the step of detecting the pressure of the fuel tank after the fuel tank pressure relief begins and determining whether the pressure drops to a preset pressure threshold, the method further includes: When the pressure does not drop to the preset pressure threshold, determining that a pressure relief failure occurs in the fuel tank; Controlling the fuel tank pressure relief valve to open and close continuously for a preset number of times to resolve the pressure relief fault; When the pressure still does not drop to the preset pressure threshold, the emergency mode is activated to open the fuel tank cap so that the fuel filler cap can be screwed on to release pressure and refuel slowly.

3. The high pressure oil tank pressure relief control method according to claim 1, characterized in that: After the step of driving the fuel filler cap motor of the vehicle to unlock to perform the refueling operation, the method further includes: When it is detected that the fuel filler cap is closed and no request to open the fuel filler cap again is detected within a first preset time period, the driving motor is locked and the fuel tank pressure relief valve is closed; When a request to open the fuel filler lid again is detected within the first preset time period, the timing is reset and the fuel filler lid is controlled to be reopened.

4. The high pressure oil tank pressure relief control method according to claim 1, characterized in that: After the step of detecting whether the vehicle is in a non-driving high-pressure state, the method further includes: When the vehicle is in a high-pressure driving state, obtaining the vehicle driving mode and the fuel tank pressure in real time; When it is detected that the vehicle driving mode is the pure electric mode, the fuel tank pressure relief valve is kept closed so that the oil and gas are sealed in the fuel tank; When the fuel tank pressure rises to a one-way physical opening threshold, the fuel tank pressure relief valve is opened to guide the fuel gas into the carbon canister; When it is detected that the vehicle driving mode is the hybrid mode and the engine is in operation, the openings of the fuel tank pressure relief valve and the charcoal canister solenoid valve are dynamically adjusted based on the engine combustion model control requirements, and oil and gas are introduced into the engine for combustion to reduce the tank pressure.

5. The high pressure oil tank pressure relief control method according to claim 1, characterized in that: The method further comprises: When it is detected that the refueling operation is completed, the fuel filler cap is not closed, and the vehicle speed is greater than a preset speed, the driver is prompted through the instrument that the fuel filler cap is not closed, and the fuel tank pressure relief valve is driven to close, turning off the fuel filler cap opening permission signal.

6. The high pressure oil tank pressure relief control method according to claim 1, characterized in that: The step of determining a preset pressure threshold in response to a refueling request comprises: Respond to refueling requests and obtain historical fuel tank pressure test data; determining a sample statistical value based on the historical fuel tank pressure test data; A preset pressure threshold is determined based on the sample statistical value.

7. The high pressure oil tank pressure relief control method according to claim 1, characterized in that: The method further comprises: After the fuel filler cap of the vehicle is unlocked, the fuel tank pressure relief valve is kept open for a second preset time period and the CAN network is kept awake to perform a refueling operation.

8. A high-pressure oil tank pressure relief control device, characterized in that: The device comprises: A first detection module, for responding to a refueling request, determining a preset pressure threshold and detecting whether the vehicle is in a non-driving high pressure state; A pressure relief module, used for controlling the fuel tank pressure relief valve to open when the vehicle is in the non-driving high pressure state to relieve the pressure of the fuel tank and guide the oil and gas into the carbon canister; a second detection module, configured to detect the pressure of the fuel tank after the fuel tank pressure relief begins, and determine whether the pressure drops to the preset pressure threshold; The refueling module is used to send a refueling permission signal to the door controller when the pressure drops to the preset pressure threshold, so as to drive the fuel filler cap motor of the vehicle to unlock to perform the refueling operation.

9. A high-pressure oil tank pressure relief control device, characterized in that: The device includes: a memory, a processor, and a high-pressure oil tank pressure relief control program stored in the memory and executable on the processor, wherein the high-pressure oil tank pressure relief control program is configured to implement the steps of the high-pressure oil tank pressure relief control method as described in any one of claims 1 to 7.

10. A storage medium, characterized in that: The storage medium stores a high-pressure oil tank pressure relief control program, and when the high-pressure oil tank pressure relief control program is executed by the processor, the steps of the high-pressure oil tank pressure relief control method according to any one of claims 1 to 7 are implemented.

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