Control method for high-pressure oil tank system of hybrid passenger car

Abstract

The invention provides a control method for a high-pressure oil tank system of a hybrid passenger car, and aims to improve the safety and the automation level in the refueling process of the car, ensure the operation safety by pressing a refueling button for a long time and combining identity verification, avoid false triggering, receive a signal by a VCU (Vehicle Control Unit), control the safe power-off of a high-pressure system of the whole car, and improve the safety and the automation level of the refueling process of the car. The method comprises the steps that a high-pressure fuel tank is started, a pressure relief request is sent to a high-pressure fuel tank pressure relief control module EMS, the EMS intelligently adjusts the opening degree of a pressure relief valve to achieve efficient pressure relief according to the pressure value and temperature data monitored in real time, a vehicle body control module BCM is informed to open an oil filler cap, and after oil filling is completed, the system automatically detects the state of the oil filler cap to ensure correct closing of the oil filler cap; for the situation that the oil filler cap cannot be automatically closed or pressure relief fails, the system is provided with a retry mechanism and an alarm function, safety is guaranteed, the vehicle state is monitored in real time through multiple sensors, and intelligent oil filling process management is achieved in combination with a dynamic adjustment control strategy.

Description

Technical Field

[0001] The present invention relates to the technical field of hybrid electric vehicle high pressure fuel tank refueling control, and in particular to a hybrid passenger vehicle high pressure fuel tank system control method. Background Art

[0002] Against the backdrop of a severe energy crisis and increasingly serious environmental pollution, hybrid vehicles are more efficient in energy utilization, more environmentally friendly, and have no range anxiety, while taking into account both energy conservation and endurance needs. They meet the needs of today's era. It is precisely because hybrid vehicles have the characteristics of pure electric driving that users may use pure electric driving for a long time without using oil in their daily car use. In order to meet the requirements of the National VI emission regulations and avoid evaporative emissions due to long-term non-use of fuel in the fuel tank, high-pressure fuel tanks are used in hybrid models as a solution.

[0003] With the development of new energy vehicle technology, the safe management of high-pressure fuel tanks has become an important research field. The refueling process of traditional fuel vehicles is simple and direct, while hybrid vehicles involve high-voltage systems. Therefore, before refueling, it is necessary to ensure that the high-voltage system has been safely powered off and that the fuel tank is at an appropriate pressure level to avoid potential safety risks. As the current level of vehicle intelligence improves, more and more hybrid models are equipped with intelligent power-on and power-off functions. When the user opens the door and gets in the vehicle, the high-voltage power is turned on, and the user no longer needs to operate the start switch. Considering the risk of static electricity fire when refueling in a high-voltage state, the user is also required to operate the vehicle to power off the power, and the user is required to open and close the fuel filler cap, which increases the user's operations when refueling and reduces the user experience. If the user does not close the fuel filler cap, there is a risk of fuel spraying. Summary of the invention

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

[0005] The problem to be solved by the present invention is: to ensure the safety of refueling operation through identity authentication, to use on-board sensors to monitor the vehicle status in real time to ensure safe power-off, and to ensure the safety of the refueling process by accurately controlling the pressure relief process of the high-pressure fuel tank. Intelligent control of the fuel filler cap, application of dynamic refueling strategies and automatic processing mechanisms under abnormal conditions are proposed, which effectively avoids safety hazards caused by improper operation or system failures.

[0006] A control method for a high-pressure fuel tank system of a hybrid passenger car, the technical solution adopted is as follows: S1: trigger the refueling signal, perform identity authentication, long press the refueling button switch, trigger the refueling signal, the signal is transmitted to the vehicle controller VCU, detect the strength of the trigger signal, and eliminate false triggering; S2: VCU receives the signal and controls the power off. After receiving the start status information of the refueling button, VCU wakes up the high-pressure fuel tank pressure relief control module EMS, uses sensors to monitor the vehicle status in real time, and controls the high-voltage power off of the vehicle. VCU also receives the fuel filler cap status information from the body control module BCM and sends a pressure relief request signal. S3: EMS controls the pressure relief of the high-pressure fuel tank. After receiving the pressure relief request signal sent by the VCU, the EMS controls the pressure relief valve of the high-pressure fuel tank to open and release the pressure. The EMS monitors the internal pressure value of the high-pressure fuel tank in real time, performs temperature compensation on the internal pressure value, and determines the pressure relief state. When the pressure drops to the preset value within the set time, the preset value is calibrated according to the performance of the high-pressure fuel tank, and the pressure relief is considered to be completed. S4: BCM controls the fuel filler cap to open, and EMS sends a pressure relief completion status signal to BCM. BCM controls the fuel filler cap lock to unlock and pop open the fuel filler cap, and dynamically adjusts the fuel filler cap opening strategy according to the current environmental conditions. At the same time, EMS sends a pressure relief completion status signal to the instrument display module IC, and IC displays that the pressure relief is completed and the fuel can be refueled; Use the position sensor to detect the state of the fuel filler cap and whether it is fully opened. If (position sensor reading == fully opened) {control successful} else {retry control}; S5: Refuel and close the fuel filler cap. The dynamic refueling strategy is used to perform the refueling operation. After the fuel filler cap is closed, the fuel filler cap position sensor detects the fuel filler cap closed state, and the BCM sends the fuel filler cap state signal to the VCU. S6: VCU controls the pressure relief valve to close. After receiving the fuel filler cap status signal from "open" to "closed", VCU sends a pressure relief request closing signal to EMS, and EMS controls the high-pressure tank pressure relief valve to close. S7: Handle 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 controlling the unlocking of 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 restarts the timing and tries to close it again until it is successfully closed and the preset number of times is reached; S8: Handle pressure relief failure. When the EMS fails to reduce the tank pressure to the preset 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 failure and immediately alarms to indicate that maintenance is required. The VCU sends a pressure relief request closing signal to the EMS, and the EMS controls the high-pressure tank pressure relief valve to close.

[0007] Furthermore, the identity authentication is performed in S1, the refueling button switch is long pressed to trigger the refueling signal, the intensity of the triggering signal is detected, and false triggering is eliminated, including: 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. Establish an authentication context model; S12: Calculate the context feature similarity for 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), the authentication is passed. Threshold is a threshold, and only authorized users can trigger the refueling request; S13: When the VCU detects that the long - press signal duration exceeds 2 seconds, confirm it as a valid refueling request. If (the long - press time of the refueling button switch > 2 seconds), trigger the refueling request; S14: Detect the intensity of the triggered signal to exclude false triggers. If (the detected signal intensity > the preset signal intensity threshold), trigger the refueling request.

[0008] Further, in S2, sensors are used to monitor the vehicle's overall status in real - time, and the VCU controls the vehicle to cut off high - voltage power, including: S21: Use in - vehicle sensors including current sensors, voltage sensors, and temperature sensors to monitor the vehicle's overall status in real - time. According to the monitoring results, determine whether the power - off conditions are met, , 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 < the status monitoring score threshold), allow power - off; S22: The VCU sends a power - off command to the high - voltage system and waits for an acknowledgment signal. If (the high - voltage system status == high - voltage), send the power - off command and wait for the acknowledgment signal. For the timeout handling of the acknowledgment signal, if (the waiting time > 5 seconds ∧ the acknowledgment signal is received), retry the power - off command.

[0009] Further, in S3, control the high - pressure fuel tank pressure relief valve to open for pressure relief, and the EMS monitors the internal pressure value of the high - pressure fuel tank in real - time, compensates the internal pressure value for temperature, and judges the pressure relief status, including: S31: Adjust the opening of the pressure relief valve according to the deviation between the current pressure and the target pressure, , where is the control signal, and is the opening of the pressure relief valve, is the error, the difference between the current pressure and the target pressure, They are proportional coefficient, integral coefficient and differential coefficient respectively; S32: When monitoring the internal pressure value of the high-pressure oil tank in real time, read the real-time pressure value And the real-time temperature value T, use the temperature compensation formula to calculate the corrected pressure value , update the corrected pressure value to the current pressure value, ,in is the reference temperature; S33: Pressure relief completion condition, if (real-time pressure value < preset pressure value ∧ duration > 5 seconds) {pressure relief completed}.

[0010] Furthermore, in S5, refueling and closing the fuel filler cap, a dynamic refueling strategy is used to perform a refueling operation, including: S51: Dynamically adjust the refueling strategy and refueling rate according to the current tank status and environmental conditions ,in The real-time oil level in the tank. is the real-time temperature value, and They are adjustment coefficients; S52: Use the position sensor and force sensor to detect the state of the fuel filler cap, if (position sensor reading == fully closed ∧ force sensor reading < force threshold) {control successful} else {retry control}.

[0011] Furthermore, the step S6 of sending a pressure relief request closing signal to the EMS, and the EMS controlling the high-pressure oil tank pressure relief valve to close, includes: S61: Using the state machine model, if (fuel filler cap status == closed) {send a command to close the pressure relief valve; wait for confirmation signal} S62: Confirmation signal timeout processing, if (waiting time>5 seconds∧confirmation signal received) {retry close command}.

[0012] Furthermore, in S7, the BCM starts timing from controlling the fuel filler cap lock to unlock. When the fuel filler cap encounters resistance during closing, the fuel filler cap will return to the open state, and the BCM will restart timing and try to close again until it is successfully closed and reaches a preset number of times, including: S71: timing algorithm, if (timing time>10 seconds∧fuel filler cap status==open) {automatically close the fuel filler cap}; S72: Processing when encountering resistance, if (force sensor reading > force threshold) {stop closing; restart timing; retry closing}; S73: Retry times limit, if (retries > 3 times) {stop retrying; send warning signal}.

[0013] Furthermore, if the pressure relief fails in S8, the EMS sends a pressure relief failure signal to the VCU, BCM and IC, and the IC displays a pressure relief failure and immediately issues an alarm to indicate that maintenance is required, including: S81: Pressure relief failure condition, if (real-time pressure relief pressure > calibrated pressure ∧t lasts > 30 seconds) {pressure relief failure}; S82: Using the state machine model, if (pressure relief fails) {send a fault signal; control the pressure relief valve to close}; S83: Once an abnormality is found, an alarm is immediately triggered, if (|current pressure - expected pressure|> set threshold) {trigger an alarm}.

[0014] The beneficial effects of the present invention are: through identity authentication, false trigger elimination mechanism and high voltage power-off measures, unsafe operations and accidents are avoided, thereby improving safety; Dynamic refueling strategy and fuel filler cap automatic control technology are used to intelligently adjust the refueling speed and fuel filler cap opening and closing strategy according to the vehicle's current status and environmental conditions, improving convenience and comfort of use; By real-time monitoring of the internal pressure of the high-pressure fuel tank and performing temperature compensation, the accuracy and stability of the pressure relief process are ensured. There is a corresponding processing mechanism for the situation where the fuel filler cap is not closed or the pressure relief fails, which enhances reliability and fault recovery capabilities. When a system fault is detected, such as pressure relief failure, it can promptly alarm and provide maintenance prompts to quickly locate the problem, reduce long downtime caused by the fault, and thus reduce the maintenance cost of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The present invention is a flow chart of a control method for a high-pressure fuel tank system of a hybrid passenger vehicle. DETAILED DESCRIPTION

[0016] The present invention is further clearly and completely described below, but the protection scope of the present invention is not limited thereto.

[0017] A control method for a high-pressure fuel tank system of a hybrid passenger car, the technical solution adopted is as follows: S1: trigger the refueling signal, perform identity authentication, long press the refueling button switch, trigger the refueling signal, the signal is transmitted to the vehicle controller VCU, detect the strength of the trigger signal, and eliminate false triggering; S2: VCU receives the signal and controls the power off. After receiving the start status information of the refueling button, VCU wakes up the high-pressure fuel tank pressure relief control module EMS, uses sensors to monitor the vehicle status in real time, and controls the high-voltage power off of the vehicle. VCU also receives the fuel filler cap status information from the body control module BCM and sends a pressure relief request signal. S3: EMS controls the pressure relief of the high-pressure fuel tank. After receiving the pressure relief request signal sent by the VCU, the EMS controls the pressure relief valve of the high-pressure fuel tank to open and release the pressure. The EMS monitors the internal pressure value of the high-pressure fuel tank in real time, performs temperature compensation on the internal pressure value, and determines the pressure relief state. When the pressure drops to the preset value within the set time, the preset value is calibrated according to the performance of the high-pressure fuel tank, and the pressure relief is considered to be completed. S4: BCM controls the fuel filler cap to open, and EMS sends a pressure relief completion status signal to BCM. BCM controls the fuel filler cap lock to unlock and pop open the fuel filler cap, and dynamically adjusts the fuel filler cap opening strategy according to the current environmental conditions. At the same time, EMS sends a pressure relief completion status signal to the instrument display module IC, and IC displays that the pressure relief is completed and the fuel can be refueled; Use the position sensor to detect the state of the fuel filler cap and whether it is fully opened. If (position sensor reading == fully opened) {control successful} else {retry control}; S5: Refuel and close the fuel filler cap. The dynamic refueling strategy is used to perform the refueling operation. After the fuel filler cap is closed, the fuel filler cap position sensor detects the fuel filler cap closed state, and the BCM sends the fuel filler cap state signal to the VCU. S6: VCU controls the pressure relief valve to close. After receiving the fuel filler cap status signal from "open" to "closed", VCU sends a pressure relief request closing signal to EMS, and EMS controls the high-pressure tank pressure relief valve to close. S7: Handle 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 controlling the unlocking of 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 restarts the timing and tries to close it again until it is successfully closed and the preset number of times is reached; S8: Handle pressure relief failure. When the EMS fails to reduce the tank pressure to the preset 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 failure and immediately alarms to indicate that maintenance is required. The VCU sends a pressure relief request closing signal to the EMS, and the EMS controls the high-pressure tank pressure relief valve to close.

[0018] refer to Figure 1 The figure shows a flow chart of a control method for a high-pressure fuel tank system of a hybrid passenger vehicle.

[0019] Furthermore, the identity authentication is performed in S1, the refueling button switch is long pressed to trigger the refueling signal, the intensity of the triggering signal is detected, and false triggering is eliminated, including: 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 authentication context model; S12: Calculate the context feature similarity for 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 the refueling request; S13: When the VCU detects that the long - press signal duration exceeds 2 seconds, confirm it as a valid refueling request. if(long - press refueling button switch time > 2 seconds){Trigger the refueling request}; S14: Detect the intensity of the triggered signal to exclude false triggers. if(detected signal strength > preset signal strength threshold){Trigger the refueling request}.

[0020] Furthermore, in S2, sensors are used to monitor the vehicle's overall status in real - time, and the VCU controls the vehicle to cut off high - voltage power, including: S21: Use on - vehicle sensors including current sensors, voltage sensors, and temperature sensors to monitor the vehicle's overall status in real - time. According to the monitoring results, judge whether the power - off conditions are met, , 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}; 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 the power - off command; wait for the confirmation signal}. Handle the timeout of the confirmation signal. if(waiting time > 5 seconds ∧ received confirmation signal){Retry the power - off command}.

[0021] Furthermore, in S3, control the high - pressure fuel tank pressure relief valve to open for pressure relief, and the EMS monitors the internal pressure value of the high - pressure fuel tank in real - time, compensates the internal pressure value for temperature, and judges the pressure relief status, including: S31: Adjust the opening of the pressure relief valve according to the deviation between the current pressure and the target pressure, , where is the control signal, and is the opening of the pressure relief valve, is the error, the difference between the current pressure and the target pressure, They are proportional coefficient, integral coefficient and differential coefficient respectively; S32: When monitoring the internal pressure value of the high-pressure oil tank in real time, read the real-time pressure value And the real-time temperature value T, use the temperature compensation formula to calculate the corrected pressure value , update the corrected pressure value to the current pressure value, ,in is the reference temperature; S33: Pressure relief completion condition, if (real-time pressure value < preset pressure value ∧ duration > 5 seconds) {pressure relief completed}.

[0022] Furthermore, in S5, refueling and closing the fuel filler cap, a dynamic refueling strategy is used to perform a refueling operation, including: S51: Dynamically adjust the refueling strategy and refueling rate according to the current tank status and environmental conditions ,in The real-time oil level in the tank. is the real-time temperature value, and They are adjustment coefficients; S52: Use the position sensor and force sensor to detect the state of the fuel filler cap, if (position sensor reading == fully closed ∧ force sensor reading < force threshold) {control successful} else {retry control}.

[0023] Furthermore, the step S6 of sending a pressure relief request closing signal to the EMS, and the EMS controlling the high-pressure oil tank pressure relief valve to close, includes: S61: Using the state machine model, if (fuel filler cap status == closed) {send a command to close the pressure relief valve; wait for confirmation signal} S62: Confirmation signal timeout processing, if (waiting time>5 seconds∧confirmation signal received) {retry close command}.

[0024] Furthermore, in S7, the BCM starts timing from controlling the fuel filler cap lock to unlock. When the fuel filler cap encounters resistance during closing, the fuel filler cap will return to the open state, and the BCM will restart timing and try to close again until it is successfully closed and reaches a preset number of times, including: S71: timing algorithm, if (timing time>10 seconds∧fuel filler cap status==open) {automatically close the fuel filler cap}; S72: Processing when encountering resistance, if (force sensor reading > force threshold) {stop closing; restart timing; retry closing}; S73: Retry times limit, if (retries > 3 times) {stop retrying; send warning signal}.

[0025] Furthermore, if the pressure relief fails in S8, the EMS sends a pressure relief failure signal to the VCU, BCM and IC, and the IC displays a pressure relief failure and immediately issues an alarm to indicate that maintenance is required, including: S81: Pressure relief failure condition, if (real-time pressure relief pressure > calibrated pressure ∧t lasts > 30 seconds) {pressure relief failure}; S82: Using the state machine model, if (pressure relief fails) {send a fault signal; control the pressure relief valve to close}; S83: Once an abnormality is found, an alarm is immediately triggered, if (|current pressure - expected pressure|> set threshold) {trigger an alarm}.

[0026] The present invention provides a control method for a high-pressure fuel tank system of a hybrid passenger vehicle, aiming to improve the safety and automation level of a vehicle refueling process. By long pressing a refueling button and combining identity verification, the safety of the operation is ensured to avoid false triggering. A vehicle controller VCU receives a signal, controls the high-pressure system of the vehicle to be safely powered off, and sends a pressure relief request to a high-pressure fuel tank pressure relief control module EMS. The EMS intelligently adjusts the opening of a pressure relief valve to achieve efficient pressure relief based on real-time monitored pressure values ​​and temperature data, and notifies a body control module BCM to open the fuel filler cap. After refueling is completed, the system automatically detects the state of the fuel filler cap to ensure that it is correctly closed. For situations where the fuel filler cap fails to close automatically or pressure relief fails, the system is provided with a retry mechanism and an alarm function to ensure safety. A variety of sensors are used to monitor the vehicle state in real time, combined with a dynamically adjusted control strategy, to achieve intelligent refueling process management.

Claims

1. A method for controlling a high pressure fuel tank system of a hybrid passenger vehicle, characterized in that: include: S1: trigger the refueling signal, perform identity authentication, long press the refueling button switch, trigger the refueling signal, the signal is transmitted to the vehicle controller VCU, detect the strength of the trigger signal, and eliminate false triggering; S2: VCU receives the signal and controls the power off. After receiving the start status information of the refueling button, VCU wakes up the high-pressure fuel tank pressure relief control module EMS, uses sensors to monitor the vehicle status in real time, and controls the high-voltage power off of the vehicle. VCU also receives the fuel filler cap status information from the body control module BCM and sends a pressure relief request signal. S3: EMS controls the pressure relief of the high-pressure fuel tank. After receiving the pressure relief request signal sent by the VCU, the EMS controls the pressure relief valve of the high-pressure fuel tank to open and release the pressure. The EMS monitors the internal pressure value of the high-pressure fuel tank in real time, performs temperature compensation on the internal pressure value, and determines the pressure relief state. When the pressure drops to the preset value within the set time, the preset value is calibrated according to the performance of the high-pressure fuel tank, and the pressure relief is considered to be completed. S4: BCM controls the fuel filler cap to open, and EMS sends a pressure relief completion status signal to BCM. BCM controls the fuel filler cap lock to unlock and pop open the fuel filler cap, and dynamically adjusts the fuel filler cap opening strategy according to the current environmental conditions. At the same time, EMS sends a pressure relief completion status signal to the instrument display module IC, and IC displays that the pressure relief is completed and the fuel can be refueled; Use the position sensor to detect the state of the fuel filler cap and whether it is fully opened. If (position sensor reading == fully opened) {control successful} else {retry control}; S5: Refuel and close the fuel filler cap. The dynamic refueling strategy is used to perform the refueling operation. After the fuel filler cap is closed, the fuel filler cap position sensor detects the fuel filler cap closed state, and the BCM sends the fuel filler cap state signal to the VCU. S6: VCU controls the pressure relief valve to close. After receiving the fuel filler cap status signal from "open" to "closed", VCU sends a pressure relief request closing signal to EMS, and EMS controls the high-pressure tank pressure relief valve to close. S7: Handle 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 controlling the unlocking of 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 restarts the timing and tries to close it again until it is successfully closed and the preset number of times is reached; S8: Handle pressure relief failure. When the EMS fails to reduce the tank pressure to the preset 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 failure and immediately alarms to indicate that maintenance is required. The VCU sends a pressure relief request closing signal to the EMS, and the EMS controls the high-pressure tank pressure relief valve to close.

2. A hybrid passenger car high pressure fuel tank system control method as claimed in claim 1, characterized in that: In S1, identity authentication is performed, the refueling button switch is long pressed to trigger the refueling signal, the strength of the triggering signal is detected, and false triggering is eliminated, including: S11: Collect user's environmental data, including geographic location, time, and device status data. Geographic location features include latitude, longitude, and altitude. Time features include hours, minutes, seconds, and weeks. Device status features include battery percentage, network type, and signal strength. Establish an identity authentication scenario model. S12: Calculate the similarity of context features for identity authentication, , where is the context similarity score, is the context feature difference, Calculate the absolute value difference based on the environmental data of the user collected in S11, is the number of context features, if (CSC < Threshold) {verification passed}, Threshold is the threshold, and only authorized users can trigger the refueling request; S13: VCU detects that the long-press signal lasts for more than 2 seconds and confirms it as a valid refueling request, if (long-press the refueling button switch time>2 seconds) {trigger refueling request}; S14: Detect the strength of the trigger signal to eliminate false triggering, if (the detected signal strength> the preset signal strength threshold) {trigger a refueling request}.

3. A hybrid passenger car high pressure fuel tank system control method as claimed in claim 1, characterized in that: In S2, sensors are used to monitor the status of the vehicle in real time, and the VCU controls the high voltage power-off of the vehicle, including: S21: Use vehicle-mounted sensors including current sensors, voltage sensors, and temperature sensors to monitor the vehicle status in real time, and determine whether the power-off conditions are met based on the monitoring results. ,in Score condition monitoring, For real-time current data, For real-time voltage data, For real-time temperature data, is the weight coefficient, if(SS<status monitoring score threshold){power off is allowed}; S22: VCU sends a power-off command to the high-voltage system and waits for a confirmation signal. If (high-voltage system status == high voltage) {sends a power-off command; waits for a confirmation signal}, the confirmation signal times out. If (waiting time > 5 seconds ∧ confirmation signal received) {retry the power-off command}.

4. A hybrid passenger car high pressure fuel tank system control method as claimed in claim 1, characterized in that: In S3, the pressure relief valve of the high-pressure oil tank is controlled to open and 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 state, including: S31: Adjust the opening of the pressure relief valve according to the deviation between the current pressure and the target pressure. , where The control signal is the opening of the pressure relief valve. is the error, the difference between the current pressure and the target pressure, They are proportional coefficient, integral coefficient and differential coefficient respectively; S32: When monitoring the internal pressure value of the high-pressure oil tank in real time, read the real-time pressure value And the real-time temperature value T, use the temperature compensation formula to calculate the corrected pressure value , update the corrected pressure value to the current pressure value, ,in is the reference temperature; S33: Pressure relief completion condition, if (real-time pressure value < preset pressure value ∧ duration > 5 seconds) {pressure relief completed}.

5. A hybrid passenger vehicle high pressure fuel tank system control method as claimed in claim 1, characterized in that: In S5, refueling and closing the fuel filler cap, and adopting a dynamic refueling strategy to perform a refueling operation include: S51: Dynamically adjust the refueling strategy and refueling rate according to the current tank status and environmental conditions ,in The real-time oil level in the tank. is the real-time temperature value, and They are adjustment coefficients; S52: Use the position sensor and force sensor to detect the state of the fuel filler cap, if (position sensor reading == fully closed ∧ force sensor reading < force threshold) {control successful} else {retry control}.

6. A hybrid passenger car high pressure fuel tank system control method as claimed in claim 1, characterized in that: The step S6 sends a pressure relief request closing signal to the EMS, and the EMS controls the high-pressure oil tank pressure relief valve to close, including: S61: Using the state machine model, if (fuel filler cap status == closed) {send a command to close the pressure relief valve; wait for confirmation signal} S62: Confirmation signal timeout processing, if (waiting time>5 seconds∧confirmation signal received) {retry close command}.

7. A hybrid passenger vehicle high pressure fuel tank system control method as claimed in claim 1, characterized in that: In S7, the BCM starts timing from when the fuel filler cap lock is unlocked. When the fuel filler cap encounters resistance during closing, the fuel filler cap returns to the open state, and the BCM restarts timing and tries to close again until it is successfully closed and reaches a preset number of times, including: S71: timing algorithm, if (timing time>10 seconds∧fuel filler cap status==open) {automatically close the fuel filler cap}; S72: Processing when encountering resistance, if (force sensor reading > force threshold) {stop closing; restart timing; retry closing}; S73: Retry times limit, if (retries > 3 times) {stop retrying; send warning signal}.

8. A hybrid passenger vehicle high pressure fuel tank system control method as claimed in claim 1, characterized in that: In the above S8, it is determined that the pressure relief fails, and the EMS sends a pressure relief failure signal to the VCU, BCM and IC. The IC displays a pressure relief failure and immediately alarms to indicate that maintenance is required, including: S81: Pressure relief failure condition, if (real-time pressure relief pressure > calibrated pressure ∧t lasts > 30 seconds) {pressure relief failure}; S82: Using the state machine model, if (pressure relief fails) {send a fault signal; control the pressure relief valve to close}; S83: Once an abnormality is found, an alarm is immediately triggered, if (|current pressure - expected pressure|> set threshold) {trigger an alarm}.

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