A control method for a high-pressure oil tank system of a hybrid passenger vehicle

Abstract

The application provides a hybrid passenger vehicle high-pressure oil tank system control method, aiming to improve the safety and automation level of the vehicle refueling process, ensuring the safety of the operation by long-pressing the refueling button and combining identity verification to avoid accidental triggering, the vehicle control unit VCU receiving the signal, controlling the vehicle high-pressure system to safely power off, and sending a pressure relief request to the high-pressure oil tank relief control module EMS, the EMS intelligently adjusting the relief valve opening degree according to the real-time monitored pressure value and temperature data to achieve efficient pressure relief, and notifying the body control module BCM to open the refueling port cover, after the refueling is completed, the system automatically detects the state of the refueling port cover to ensure that it is correctly closed, for the case that the refueling port cover fails to automatically close or the pressure relief fails, the system is provided with a retry mechanism and an alarm function to ensure safety, and by using various sensors to monitor the vehicle state in real time and combining the dynamically adjusted control strategy, the intelligent refueling process management is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of high-pressure fuel tank refueling control of hybrid electric vehicles, and particularly relates to a high-pressure fuel tank system control method for a hybrid passenger vehicle. BACKGROUND

[0002] Under the background of severe energy crisis and increasingly serious environmental pollution, while meeting the requirements of energy saving and endurance, hybrid vehicles are more efficient in energy utilization, more friendly to the environment, and have no endurance anxiety, which meets the needs of the current era. Because hybrid vehicles have the characteristics of pure electric driving, users may have the working condition of using pure electric driving for a long time without refueling in daily vehicle use. In order to meet the requirements of the national sixth emission regulations and avoid evaporation emissions due to long-term non-use of fuel in the fuel tank, a high-pressure fuel tank is applied to hybrid vehicles as a solution.

[0003] With the development of new energy vehicle technology, the safety management of high-pressure fuel tank has become an important research field. The refueling process of traditional fuel vehicles is simple and direct, while hybrid electric vehicles involve high-voltage systems, so it is necessary to ensure that the high-voltage system has been safely powered off and the fuel tank is at an appropriate pressure level before refueling to avoid potential safety risks. With the improvement of the intelligent level of current vehicles, hybrid vehicles are increasingly equipped with intelligent power-on and power-off functions. Users get into the vehicle with the vehicle powered on, and no longer need to operate the start switch. Considering the risk of static electricity fire during refueling in high-voltage state, users also need to operate the whole vehicle power-off and open and close the fuel filler door, which increases the user's operation during refueling and reduces the user experience. If the user does not close the fuel filler door, there is a risk of oil spilling. SUMMARY

[0004] The purpose of the present application is to provide a high-pressure fuel tank system control method for a hybrid passenger vehicle.

[0005] The problem to be solved by the present application is to ensure the safety of refueling operation through identity verification, to ensure safe power-off through real-time monitoring of vehicle state by vehicle-mounted sensors, and to ensure safety during refueling through precise control of the pressure relief process of the high-pressure fuel tank. The application proposes intelligent control of the fuel filler door, application of dynamic refueling strategy, and automatic handling mechanism in abnormal situations, effectively avoiding safety hazards caused by improper operation or system failure.

[0006] A high-pressure fuel tank system control method for a hybrid passenger vehicle, the technical solution adopted is as follows:

[0007] S1: Trigger a refueling signal, perform identity verification, and press the refueling button switch for a long time to trigger the refueling signal. The signal is transmitted to the vehicle controller VCU, and the strength of the trigger signal is detected to exclude false triggering.

[0008] S2: The VCU receives the signal and controls the power-down. After receiving the refueling button start status information, the VCU wakes up the high-pressure fuel tank pressure relief control module EMS. The sensor monitors the vehicle status in real time. The VCU controls the vehicle high-pressure power-down. At the same time, the VCU receives the fuel filler cap status information from the body control module BCM and sends a pressure relief request signal.

[0009] S3: EMS controls the high-pressure oil tank to release pressure. After receiving the pressure release request signal sent by VCU, EMS controls the pressure release valve of the high-pressure oil tank to open and release pressure. EMS monitors the internal pressure value of the high-pressure oil tank in real time, performs temperature compensation on the internal pressure value, and judges the pressure release status. When the pressure drops to the predetermined value within the set time, the predetermined value is calibrated according to the performance of the high-pressure oil tank, and the pressure release is considered to be completed.

[0010] S4: The BCM controls the opening of the filler cap. The EMS sends a depressurization completion status signal to the BCM. The BCM controls the filler cap lock to unlock and pops open the filler cap. The opening strategy of the filler cap is dynamically adjusted according to the current environmental conditions. At the same time, the EMS sends a depressurization completion status signal to the instrument display module IC. The IC displays that the depressurization is complete and the filler is ready to be filled.

[0011] Use a position sensor to detect the status of the fuel filler cap, and check if the fuel filler cap is fully open. If (position sensor reading == fully open) {control successful} else {retry control};

[0012] S5: Refuel and close the filler cap. The refueling operation is performed using a dynamic refueling strategy. After the filler cap is closed, the filler cap position sensor detects that the filler cap is closed. The BCM sends the filler cap status signal to the VCU.

[0013] S6: The VCU controls the pressure relief valve to close. After the VCU receives the status signal of the filler cap changing from "open" to "closed", it sends a pressure relief request to the EMS. The EMS then controls the high-pressure tank pressure relief valve to close.

[0014] S7: Handling the situation where the fuel filler cap is not closed. When the fuel filler cap is not closed after refueling, the BCM starts timing from unlocking the fuel filler cap lock. If the fuel filler cap is still not closed within the set time, the BCM controls the fuel filler cap to close actively. When the fuel filler cap encounters resistance during the closing process, the fuel filler cap will return to the open state. The BCM will restart the timing and try to close it again until it is successfully closed and the preset number of times is reached.

[0015] S8: Handling pressure relief failure. If the EMS fails to reduce the oil tank pressure to the predetermined value within the set time, it is determined that the pressure relief has failed. The EMS sends a pressure relief failure signal to the VCU, BCM and IC. The IC displays a pressure relief fault and immediately alarms to indicate that maintenance is required. The VCU sends a pressure relief request to the EMS, and the EMS controls the high-pressure oil tank pressure relief valve to close.

[0016] Further, in S1, for identity authentication, long-press the fueling button switch to trigger a fueling signal, and detect the intensity of the trigger signal to exclude false triggers, including:

[0017] S11: Collect the user's environmental data, including geographical location, time, and device status data. The geographical location features include latitude, longitude, and altitude. The time features include hour, minute, second, and week. The device status features include battery power percentage, network type, and signal strength, and establish an identity authentication context model;

[0018] S12: Calculate the context feature similarity for identity authentication, , where is the context similarity score, is the context feature difference, Perform absolute value difference calculation based on the user's environmental data collected in S11, is the number of context features, if (CSC < Threshold) {authentication passed}, Threshold is the threshold, and only authorized users can trigger a fueling request;

[0019] S13: The VCU detects that the duration of the long-press signal exceeds 2 seconds and confirms it as a valid fueling request, if (long-press time of the fueling button switch > 2 seconds) {trigger a fueling request};

[0020] S14: Detect the intensity of the trigger signal to exclude false triggers, if (detected signal intensity > preset signal intensity threshold) {trigger a fueling request}.

[0021] Further, in S2, use sensors to monitor the vehicle status in real time, and the VCU controls the vehicle to cut off high-voltage power, including:

[0022] S21: Use on-vehicle sensors including current sensors, voltage sensors, and temperature sensors to monitor the vehicle status in real time, and judge whether the power-off condition is met according to the monitoring results, , where is the status monitoring score, is the real-time current data, is the real-time voltage data, is the real-time temperature data, is the weight coefficient, if (SS < status monitoring score threshold) {allow power-off};

[0023] S22: The VCU sends a power-off command to the high-voltage system and waits for a confirmation signal, if (high-voltage system status == high voltage) {send a power-off command; wait for a confirmation signal}, and perform timeout processing on the confirmation signal, if (waiting time > 5 seconds ∧ receive a confirmation signal) {retry the power-off command}.

[0024] Furthermore, in step S3, the high-pressure oil tank pressure relief valve is opened to release pressure, and the EMS monitors the internal pressure value of the high-pressure oil tank in real time, performs temperature compensation on the internal pressure value, and determines the pressure relief status, including:

[0025] S31: Adjust the pressure relief valve opening based on the deviation between the current pressure and the target pressure. , among which is The control signal is the opening degree of the pressure relief valve. It is the error, the difference between the current pressure and the target pressure. These are the proportional coefficient, integral coefficient, and differential coefficient, respectively.

[0026] S32: When monitoring the internal pressure of the high-pressure oil tank in real time, read the real-time pressure value. The corrected pressure value is calculated using the real-time temperature value T and the temperature compensation formula. Update the corrected pressure value to the current pressure value. ,in Reference temperature;

[0027] S33: Pressure relief completion condition, if (real-time pressure value < predetermined pressure value ∧ duration > 5 seconds) {pressure relief complete}.

[0028] Furthermore, in step S5, refueling and closing the refueling cap, employing a dynamic refueling strategy, includes:

[0029] S51: Dynamically adjusts the refueling strategy and refueling rate based on the current fuel tank status and environmental conditions. ,in This indicates the real-time fuel level in the fuel tank. This is the real-time temperature value. and These are the adjustment coefficients;

[0030] S52: Uses position and force sensors to detect the status of the filler cap. if (position sensor reading == fully closed ∧ force sensor reading < force threshold) { control successful} else { retry control}.

[0031] Furthermore, in step S6, a pressure relief request closing signal is sent to the EMS, and the EMS controls the high-pressure oil tank pressure relief valve to close, including:

[0032] S61: Employs a state machine model. `if (fuel filler cap status == closed) { send command to close pressure relief valve; wait for confirmation signal}`

[0033] S62: Confirmation signal timeout handling, if (wait time > 5 seconds ∧ confirmation signal received) { retry close command}.

[0034] Furthermore, in S7, the BCM starts timing from unlocking the fuel filler cap. When the fuel filler cap encounters resistance during closing, it returns to the open state. The BCM then restarts the timing and attempts to close it again until it is successfully closed and the preset number of times is reached, including:

[0035] S71: Timing algorithm, if (timeout > 10 seconds ∧ fuel filler cap status == open) {automatically close fuel filler cap};

[0036] S72: Handling resistance, if (force sensor reading > force threshold) {stop shutdown; restart timing; retry shutdown};

[0037] S73: Retry limit, if (retry > number of times 3) { stop retries; send a warning signal}.

[0038] Furthermore, in step S8, if a pressure relief failure is detected, the EMS sends a pressure relief failure signal to the VCU, BCM, and IC. The IC displays a pressure relief fault and immediately issues an alarm indicating that maintenance is required, including:

[0039] S81: Pressure relief failure condition, if (real-time pressure relief > calibrated pressure ∧t duration > 30 seconds) {pressure relief failure};

[0040] S82: Uses a state machine model, if (pressure relief failure) {send fault signal; control to close pressure relief valve};

[0041] S83: Alarm will be triggered immediately upon detection of an anomaly, if (|current pressure - expected pressure| > set threshold) {alarm triggered}.

[0042] The beneficial effects of this invention are: by implementing identity verification, a false triggering exclusion mechanism, and high-voltage power-off measures, it avoids unsafe operation and accidents, thereby improving safety;

[0043] Employing a dynamic refueling strategy and automatic refueling cap control technology, the refueling speed and refueling cap opening / closing strategy are intelligently adjusted according to the vehicle's current status and environmental conditions, improving ease of use and comfort.

[0044] By monitoring the internal pressure value of the high-pressure oil tank in real time and performing temperature compensation, the accuracy and stability of the pressure relief process are ensured. There are corresponding handling mechanisms for situations where the filler cap is not closed or pressure relief fails, thereby enhancing reliability and fault recovery capabilities.

[0045] When a system fault is detected, such as a failure to depressurize, an alarm can be triggered in a timely manner and maintenance prompts can be provided to quickly locate the problem, reduce prolonged downtime caused by the fault, and thus reduce vehicle maintenance costs. Attached Figure Description

[0046] Figure 1 This is a flowchart of a control method for a high-pressure fuel tank system in a hybrid passenger vehicle. Detailed Implementation

[0047] The present invention will be further described clearly and completely below, but the scope of protection of the present invention is not limited thereto.

[0048] A control method for a high-pressure fuel tank system in a hybrid passenger vehicle, the technical solution of which is as follows:

[0049] S1: Trigger refueling signal and verify identity. Press and hold the refueling button to trigger the refueling signal. The signal is transmitted to the vehicle control unit (VCU) to detect the strength of the trigger signal and eliminate false triggers.

[0050] S2: The VCU receives the signal and controls the power-down. After receiving the refueling button start status information, the VCU wakes up the high-pressure fuel tank pressure relief control module EMS. The sensor monitors the vehicle status in real time. The VCU controls the vehicle high-pressure power-down. At the same time, the VCU receives the fuel filler cap status information from the body control module BCM and sends a pressure relief request signal.

[0051] S3: EMS controls the high-pressure oil tank to release pressure. After receiving the pressure release request signal sent by VCU, EMS controls the pressure release valve of the high-pressure oil tank to open and release pressure. EMS monitors the internal pressure value of the high-pressure oil tank in real time, performs temperature compensation on the internal pressure value, and judges the pressure release status. When the pressure drops to the predetermined value within the set time, the predetermined value is calibrated according to the performance of the high-pressure oil tank, and the pressure release is considered to be completed.

[0052] S4: The BCM controls the opening of the filler cap. The EMS sends a depressurization completion status signal to the BCM. The BCM controls the filler cap lock to unlock and pops open the filler cap. The opening strategy of the filler cap is dynamically adjusted according to the current environmental conditions. At the same time, the EMS sends a depressurization completion status signal to the instrument display module IC. The IC displays that the depressurization is complete and the filler is ready to be filled.

[0053] Use a position sensor to detect the status of the fuel filler cap, and check if the fuel filler cap is fully open. If (position sensor reading == fully open) {control successful} else {retry control};

[0054] S5: Refuel and close the filler cap. The refueling operation is performed using a dynamic refueling strategy. After the filler cap is closed, the filler cap position sensor detects that the filler cap is closed. The BCM sends the filler cap status signal to the VCU.

[0055] S6: The VCU controls the pressure relief valve to close. After the VCU receives the status signal of the filler cap changing from "open" to "closed", it sends a pressure relief request to the EMS. The EMS then controls the high-pressure tank pressure relief valve to close.

[0056] S7: Handle the situation where the fuel filler door is not closed. When the fuel filler door remains open after refueling, the BCM starts timing from when it unlocks the fuel filler door lock. If the fuel filler door is still not closed within the set time, the BCM controls the fuel filler door to close actively. When encountering resistance during the closing process of the fuel filler door, the fuel filler door will return to the open state, and the BCM will re - time and attempt to close again until it is successfully closed or the preset number of attempts is reached.

[0057] S8: Handle the situation of failed pressure relief. When the EMS fails to reduce the fuel tank pressure to the predetermined value within the set time, it is determined that the pressure relief fails. The EMS sends a pressure relief failure signal to the VCU, BCM, and IC. The IC displays a pressure relief fault and immediately gives an alarm prompt for repair. The VCU sends a pressure relief request to close the signal to the EMS, and the EMS controls the high - pressure fuel tank pressure relief valve to close.

[0058] Reference Figure 1 As shown, it is a flowchart of a control method for a high - pressure fuel tank system of a hybrid passenger vehicle.

[0059] Further, in the above - mentioned S1 for identity verification, long - press the fueling button switch to trigger a fueling signal, and detect the intensity of the trigger signal to exclude false triggers, including:

[0060] S11: Collect the user's environmental data, including geographical location, time, and device status data. Geographical location features include latitude, longitude, and altitude. Time features include hour, minute, second, and week. Device status features include battery power percentage, network type, and signal strength, and establish an identity verification context model;

[0061] S12: Calculate the context feature similarity for identity verification, , where is the context similarity score, is the context feature difference, Calculate the absolute - value difference according to the user's environmental data collected in S11, is the number of context features. If (CSC < Threshold), the verification passes. Threshold is a threshold, and only authorized users can trigger a fueling request;

[0062] S13: The VCU detects that the duration of the long - press signal exceeds 2 seconds and confirms it as a valid fueling request. If (the time of long - pressing the fueling button switch > 2 seconds), a fueling request is triggered;

[0063] S14: Detect the intensity of the trigger signal to exclude false triggers. If (the detected signal intensity > the preset signal intensity threshold), a fueling request is triggered.

[0064] Further, in the above - mentioned S2, sensors are used to monitor the vehicle's overall state in real - time, and the VCU controls the vehicle to cut off high - voltage power supply, including:

[0065] S21: The vehicle uses onboard sensors, including current sensors, voltage sensors, and temperature sensors, to monitor the vehicle's status in real time. Based on the monitoring results, it determines whether the power-down conditions are met. ,in For condition monitoring scoring, For real-time current data, For real-time voltage data, For real-time temperature data, As a weighting coefficient, if (SS < condition monitoring score threshold) { allow power-off};

[0066] S22: The VCU sends a power-down command to the high-voltage system and waits for a confirmation signal. If (high-voltage system status == high voltage) {send power-down command; wait for confirmation signal}, handle the confirmation signal timeout. If (waiting time > 5 seconds ∧ confirmation signal received) {retry power-down command}.

[0067] Furthermore, in step S3, the high-pressure oil tank pressure relief valve is opened to release pressure, and the EMS monitors the internal pressure value of the high-pressure oil tank in real time, performs temperature compensation on the internal pressure value, and determines the pressure relief status, including:

[0068] S31: Adjust the pressure relief valve opening based on the deviation between the current pressure and the target pressure. , among which is The control signal is the opening degree of the pressure relief valve. It is the error, the difference between the current pressure and the target pressure. These are the proportional coefficient, integral coefficient, and differential coefficient, respectively.

[0069] S32: When monitoring the internal pressure of the high-pressure oil tank in real time, read the real-time pressure value. The corrected pressure value is calculated using the real-time temperature value T and the temperature compensation formula. Update the corrected pressure value to the current pressure value. ,in Reference temperature;

[0070] S33: Pressure relief completion condition, if (real-time pressure value < predetermined pressure value ∧ duration > 5 seconds) {pressure relief complete}.

[0071] Furthermore, in step S5, refueling and closing the refueling cap, employing a dynamic refueling strategy, includes:

[0072] S51: Dynamically adjusts the refueling strategy and refueling rate based on the current fuel tank status and environmental conditions. ,in This indicates the real-time fuel level in the fuel tank. This is the real-time temperature value. and These are the adjustment coefficients;

[0073] S52: Uses position and force sensors to detect the status of the filler cap. if (position sensor reading == fully closed ∧ force sensor reading < force threshold) { control successful} else { retry control}.

[0074] Furthermore, in step S6, a pressure relief request closing signal is sent to the EMS, and the EMS controls the high-pressure oil tank pressure relief valve to close, including:

[0075] S61: Employs a state machine model. `if (fuel filler cap status == closed) { send command to close pressure relief valve; wait for confirmation signal}`

[0076] S62: Confirmation signal timeout handling, if (wait time > 5 seconds ∧ confirmation signal received) { retry close command}.

[0077] Furthermore, in S7, the BCM starts timing from unlocking the fuel filler cap. When the fuel filler cap encounters resistance during closing, it returns to the open state. The BCM then restarts the timing and attempts to close it again until it is successfully closed and the preset number of times is reached, including:

[0078] S71: Timing algorithm, if (timeout > 10 seconds ∧ fuel filler cap status == open) {automatically close fuel filler cap};

[0079] S72: Handling resistance, if (force sensor reading > force threshold) {stop shutdown; restart timing; retry shutdown};

[0080] S73: Retry limit, if (retry > number of times 3) { stop retries; send a warning signal}.

[0081] Furthermore, in step S8, if a pressure relief failure is detected, the EMS sends a pressure relief failure signal to the VCU, BCM, and IC. The IC displays a pressure relief fault and immediately issues an alarm indicating that maintenance is required, including:

[0082] S81: Pressure relief failure condition, if (real-time pressure relief > calibrated pressure ∧t duration > 30 seconds) {pressure relief failure};

[0083] S82: Uses a state machine model, if (pressure relief failure) {send fault signal; control to close pressure relief valve};

[0084] S83: Alarm will be triggered immediately upon detection of an anomaly, if (|current pressure - expected pressure| > set threshold) {alarm triggered}.

[0085] This invention provides a control method for a high-pressure fuel tank system in a hybrid passenger vehicle, aiming to improve the safety and automation level of the vehicle refueling process. By pressing and holding the refueling button in conjunction with identity verification, operational security is ensured, preventing accidental triggering. The vehicle control unit (VCU) receives the signal, controls the safe power-off of the vehicle's high-pressure system, and sends a pressure relief request to the high-pressure fuel tank pressure relief control module (EMS). Based on real-time monitored pressure and temperature data, the EMS intelligently adjusts the pressure relief valve opening for efficient pressure relief and notifies the body control module (BCM) to open the fuel filler cap. After refueling, the system automatically detects the status of the fuel filler cap to ensure it is correctly closed. For cases where the fuel filler cap fails to close automatically or pressure relief fails, the system has a retry mechanism and alarm function to ensure safety. Utilizing multiple sensors to monitor the vehicle status in real time, combined with dynamically adjusted control strategies, intelligent refueling process management is achieved.

Claims

1. A hybrid passenger vehicle high-pressure tank system control method characterized by comprising: Comprise: S1: trigger refueling signal, identity verification, long press refueling button switch, trigger refueling signal, signal transmission to vehicle controller VCU, detect the strength of the trigger signal, exclude false triggering; The identity verification, long press refueling button switch, trigger refueling signal, detect the strength of the trigger signal, exclude false triggering, comprise: S11: collect user's environment data, including geographic location, time, equipment state data, geographic location features include latitude, longitude, altitude, time features include hour, minute, second, week, equipment state features include battery percentage, network type, signal strength, establish identity verification context model; S12: Calculate the context feature similarity to perform identity verification, wherein is the context similarity score, is the context feature difference, According to the absolute value difference calculation of the environment data of the user collected in S11, is the context feature number, if CSC<Threshold, the verification is passed, Threshold is the threshold, only authorized users can trigger the refueling request; S13: VCU detects that the long press signal duration is more than 2 seconds, confirms as valid refueling request, if the long press refueling button switch time>2 seconds, trigger refueling request; S14: intensity detection on trigger signal, exclude false triggering, if the detected signal strength> preset signal strength threshold, trigger refueling request; S2: VCU receives signal and controls power down, VCU receives refueling button start state information, wakes up high pressure tank pressure relief control module EMS, adopts sensor to monitor vehicle state in real time, VCU controls vehicle high voltage power down, VCU receives fuel filler cap state information of vehicle body control module BCM at the same time, and sends pressure relief request signal; The sensor is used to monitor the vehicle state in real time, and the VCU controls the vehicle high voltage power down, comprising: S21: Real-time monitoring of the vehicle state by using vehicle-mounted sensors including current sensors, voltage sensors, temperature sensors, and determining whether the power-down condition is met according to the monitoring results, wherein is a state monitoring score, is real-time current data, is real-time voltage data, is real-time temperature data, is a weight coefficient, and if SS < state monitoring score threshold, power-down is allowed; S22: VCU sends power down command to high voltage system, waits for confirmation signal, if high voltage system state is high voltage, sends power down command, waits for confirmation signal, confirmation signal timeout processing, if waiting time>5 seconds and confirmation signal is received, retry power down command; S3: EMS controls high pressure tank pressure relief, after receiving the pressure relief request signal sent by VCU, controls high pressure tank pressure relief valve to open pressure relief, EMS monitors high pressure tank internal pressure value in real time, temperature compensation is carried out on internal pressure value, judges pressure relief state, when pressure is reduced to predetermined value within set time, predetermined value is calibrated according to high pressure tank performance, pressure relief is considered to be completed; S4: BCM controls fuel filler cap opening, EMS sends pressure relief completion state signal to BCM, BCM controls fuel filler cap lock unlocking and opens fuel filler cap, adjusts opening strategy of fuel filler cap according to current environmental conditions, at the same time, EMS sends pressure relief completion state signal to instrument display module IC, IC displays that pressure relief has been completed, reaches refueling state; Use position sensor to detect fuel filler cap state, detect whether fuel filler cap is completely opened, if position sensor reading is completely opened, control is successful, otherwise, retry control; S5: refueling and closing fuel filler cap, adopt dynamic refueling strategy to carry out refueling operation, after closing fuel filler cap, fuel filler cap position sensor detects fuel filler cap closing state, BCM sends fuel filler cap state signal to VCU; The refueling and closing fuel filler cap, adopt dynamic refueling strategy to carry out refueling operation, comprising: S51: dynamically adjust the refueling strategy and the dynamic refueling rate according to the current tank state and environmental conditions wherein is the real-time oil level in the tank, is the real-time temperature value, and are adjustment coefficients, respectively; S52: The position sensor and force sensor are used to detect the state of the filler cap. If the position sensor reading is fully closed and the force sensor reading is less than the force threshold, the control is successful, otherwise the control is retried; S6: The VCU controls the pressure relief valve to close. After the VCU receives the filler cap state signal changing from open to closed, it sends a pressure relief request close signal to the EMS, and the EMS controls the high-pressure tank pressure relief valve to close; S7: Processing the case where the filler cap is not closed. When the filler cap is not closed after refueling, the BCM starts timing from controlling the filler cap lock to unlock. If the filler cap is still not closed within the set time, the BCM actively closes the filler cap. If resistance is encountered during the closing of the filler cap, the filler cap will return to the open state, the BCM will restart the timing and try to close again until it is successfully closed and the preset number of times is reached; S8: Processing the case where the pressure relief fails. If the EMS fails to reduce the tank pressure to the predetermined value within the set time, it is determined that the pressure relief has failed. The EMS sends a pressure relief failure signal to the VCU, BCM, and IC. The IC displays a pressure relief fault and immediately alerts that maintenance is required. The VCU sends a pressure relief request close signal to the EMS, and the EMS controls the high-pressure tank pressure relief valve to close.

2. The hybrid passenger vehicle high-pressure tank system control method of claim 1, wherein In S3, the high-pressure tank pressure relief valve is controlled to open and relieve pressure. The EMS monitors the internal pressure value of the high-pressure tank in real time, temperature compensates the internal pressure value, and judges the pressure relief state, including: S31: adjusting the opening degree of the pressure relief valve according to the deviation of the current pressure from the target pressure, wherein is a control signal, an opening degree of the pressure relief valve, is an error, a difference between the current pressure and the target pressure, are proportional coefficient, integral coefficient, and differential coefficient, respectively; S32: reading the real-time pressure value while monitoring the internal pressure value of the high-pressure oil tank in real time and the real-time temperature value T, using a temperature compensation formula to calculate a corrected pressure value updating the corrected pressure value as the current pressure value, wherein is the reference temperature; S33: Pressure relief completion condition. If the real-time pressure value is less than the pressure predetermined value and the duration is greater than 5 seconds, the pressure relief is completed.

3. The hybrid passenger vehicle high-pressure tank system control method of claim 1, wherein In S6, the pressure relief request close signal is sent to the EMS, and the EMS controls the high-pressure tank pressure relief valve to close, including: S61: State machine model. If the filler cap state is closed, send the close pressure relief valve command and wait for the confirmation signal; S62: Confirmation signal timeout processing. If the waiting time is greater than 5 seconds and the confirmation signal is received, retry the close command.

4. The hybrid passenger vehicle high-pressure tank system control method of claim 1, wherein In S7, the BCM starts timing from controlling the filler cap lock to unlock. If resistance is encountered during the closing of the filler cap, the filler cap will return to the open state, the BCM will restart the timing and try to close again until it is successfully closed and the preset number of times is reached, including: S71: Timing algorithm. If the timing time is greater than 10 seconds and the filler cap state is open, automatically close the filler cap; S72: Resistance handling. If the force sensor reading is greater than the force threshold, stop closing, restart timing, and retry closing; S73: Retry number limit. If the retry is greater than 3 times, stop retrying and send a warning signal.

5. The hybrid passenger vehicle high-pressure tank system control method of claim 1, wherein In S8, the pressure relief failure is determined, and the EMS sends a pressure relief failure signal to the VCU, BCM, and IC. The IC displays a pressure relief fault and immediately alerts that maintenance is required, including: S81: Pressure relief failure condition. If the real-time pressure relief pressure is greater than the calibrated pressure and the t duration is greater than 30 seconds, the pressure relief fails; S82: State machine model. If the pressure relief fails, send a fault signal to control the pressure relief valve to close; S83: Immediate alarm upon detection of an anomaly. If the | current pressure - expected pressure | is greater than the set threshold, the alarm is triggered.

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