A control method and system for a high-pressure fuel tank filler cap of a hybrid vehicle

Abstract

The application discloses a control method and system for a high-pressure fuel tank filler cap of a hybrid vehicle during refueling, wherein the method comprises: pressing a refueling button, and determining a vehicle power gear; when the vehicle power is in the on gear, if the vehicle is in a driving permission state and an electronic parking brake system of the vehicle is pulled up, or the vehicle is in a driving disallowed state, determining whether the vehicle meets a precondition for refueling; when the vehicle meets the precondition for refueling, controlling a fuel filler cap lock motor to be unlocked and a fuel gas isolation valve to be opened, and identifying an opening and closing state of a fuel filler cap micro-motion door; when the micro-motion door is identified to be opened, starting refueling, and determining to end the refueling according to a refueling end condition; and controlling the fuel filler cap lock motor to be locked and the fuel gas isolation valve to be closed. The application can realize refueling when the vehicle power is in the on gear and the off gear, and the fuel gas isolation valve and the fuel filler cap lock motor are controlled by an engine control system during the refueling, so that the volatilization of fuel vapor is reduced.

Description

Technical Field

[0001] This invention relates to the field of automotive control technology, and in particular to a control method and system for the filler cap of a high-pressure fuel tank in a hybrid vehicle. Background Technology

[0002] A car's fuel tank is a special container for storing hydraulic oil or hydraulic fluid. Based on the pressure it can withstand, it is classified as an atmospheric pressure tank or a high-pressure tank. In hybrid vehicles using high-pressure tanks, the engine does not start in pure electric mode, resulting in insufficient carbon canister adsorption and causing oil vapor to evaporate outside the vehicle. This is especially true for PHEV (Plug-in Hybrid Electric Vehicle) models, where the evaporated oil vapor in pure electric mode can exceed emission limits. Therefore, PHEV models employ high-pressure fuel tanks and oil-vapor isolation devices. Summary of the Invention

[0003] The main objective of this invention is to provide a control method and system for the high-pressure fuel tank filler cap of a hybrid vehicle, which solves the problem of the engine not starting when the hybrid vehicle is in pure electric mode, causing oil vapor to evaporate outside the vehicle.

[0004] The technical solution adopted in this invention is: a control method for the filler cap of a high-pressure fuel tank in a hybrid vehicle. In this solution, the vehicle engine management system is equipped with a rear operating interface. The method includes:

[0005] After the vehicle's refueling button is pressed, determine whether the vehicle's power is on or off.

[0006] When the vehicle power is off, the vehicle's engine management system is activated by the refueling button, setting the aforementioned operating interface to ensure the continuous operation of the engine management system and determine whether the vehicle meets the preconditions for refueling; when the vehicle power is on, if the vehicle is in a driving-permitted state and the vehicle's electronic parking brake system is engaged, or if the vehicle is in a driving-disallowed state, determine whether the vehicle meets the preconditions for refueling.

[0007] When the vehicle meets the preconditions for refueling, the engine management system controls the fuel filler cap lock motor to unlock and the oil-gas isolation valve to open, and identifies the opening and closing status of the fuel filler cap micro-movement door.

[0008] When the micro-switch is detected to be open, refueling begins, and the refueling is completed according to the refueling end condition. If the vehicle power is off, after the refueling is completed, the rear operation interface is reset and the engine management system is stopped.

[0009] The engine management system controls the fuel filler cap lock motor to lock and the fuel-air isolation valve to close.

[0010] According to the above technical solution, when the vehicle power is on, if the vehicle is in a driving-allowed state and the vehicle's electronic parking brake system is not engaged, the information that the vehicle's electronic parking brake system is not engaged will be reminded to the driver through the in-vehicle infotainment system.

[0011] According to the above technical solution, the prerequisite for refueling is that the following conditions are met simultaneously: the oil-gas isolation valve is not diagnosed as faulty; the high-pressure oil tank is not diagnosed as faulty; and the pressure of the high-pressure oil tank is within a preset range.

[0012] According to the above technical solution, if the micro-movement door does not open within a preset time after the fuel filler cap lock motor is unlocked and the oil-gas isolation valve is opened, the fuel filler cap lock motor will be locked and the oil-gas isolation valve will be closed.

[0013] According to the above technical solution, after refueling begins, if the vehicle switches to a driving-allowed state and the vehicle speed is greater than the preset value while the micro-movement door is open, the refueling cap lock motor is locked and the oil-gas isolation valve is closed.

[0014] According to the above technical solution, if the micro-motion door is open for more than the preset time after refueling begins, the refueling port cover lock motor will be locked and the oil-gas isolation valve will be closed.

[0015] According to the above technical solution, the refueling termination condition is that any of the following conditions are met: the oil-gas isolation valve is diagnosed as faulty; the high-pressure fuel tank is diagnosed as faulty; the micro-switch door changes from open to closed. Furthermore, when a fault is diagnosed, the driver is alerted via the vehicle information system.

[0016] According to the above technical solution, when the vehicle power supply is detected to switch from the on position to the off position, and the micro-movement door switches from open to closed, and the closing time is longer than the preset time, the rear operation interface of the engine management system is set.

[0017] Another aspect of the present invention provides a control system for the high-pressure fuel tank filler cap when refueling a hybrid vehicle, the system executing the above-described control method for the high-pressure fuel tank filler cap when refueling a hybrid vehicle.

[0018] Another aspect of the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the above-described method for controlling the high-pressure fuel tank filler cap during refueling of a hybrid vehicle.

[0019] The beneficial effects of this invention are as follows: This invention provides a control method and system for the high-pressure fuel tank filler cap of a hybrid vehicle, which can control the refueling process in all vehicle states. This invention is particularly applicable to PHEV hybrid vehicles, and can control the high-pressure fuel tank filler cap lock motor and oil-gas isolation valve through the refueling button, engine management system, and micro-motion door of the filler cap when the vehicle power is in the ON or OFF position, thereby completing the refueling process.

[0020] Furthermore, when the vehicle is refueling with the power on, if the vehicle is detected to be in a driving-permitted state and the electronic parking brake system is not engaged, the present invention will remind the driver through the vehicle information system to ensure the safety of passengers, the vehicle, and property.

[0021] Furthermore, the present invention includes a feature to handle forgotten micro-movement valves on the refueling port cap. If the refueling personnel forget to close the micro-movement valve, or if the vehicle speed exceeds the limit or the micro-movement valve remains open for a certain period of time, the refueling process will end, the oil-gas isolation valve will be closed, and oil-gas evaporation will be reduced.

[0022] Furthermore, the present invention can identify the refueling conditions of moving the vehicle by changing the vehicle gear and the micro-movement door, thereby reducing the need for drivers to perform repetitive refueling operations at gas stations.

[0023] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a flowchart of a method for controlling the high-pressure fuel tank filler cap during refueling of a hybrid vehicle according to an embodiment of the present invention;

[0026] Figure 2 This is a flowchart of a method for controlling the high-pressure fuel tank filler cap during refueling of a hybrid vehicle, according to another embodiment of the present invention.

[0027] Figure 3 This is a schematic diagram of the control method for the high-pressure fuel tank filler cap during refueling of a hybrid vehicle according to an embodiment of the present invention.

[0028] Figure 4 This is a flowchart of the method for identifying the refueling condition in the control method of the high-pressure fuel tank filler cap when refueling a hybrid vehicle according to an embodiment of the present invention. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0030] It should be noted that the illustrations provided in the embodiments of the present invention are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0031] In this invention, it should also be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first" and "second" are used only for descriptive and distinguishing purposes and should not be construed as indicating or implying relative importance.

[0032] Example 1

[0033] This embodiment provides a method for controlling the high-pressure fuel tank filler cap during refueling of a hybrid vehicle, the process of which is as follows: Figure 1 As shown, it includes:

[0034] S1. After the vehicle's refueling button is pressed, determine whether the vehicle's power supply is in the "on" or "off" position. When the vehicle's power supply is in the "off" position, pressing the refueling button inputs a high-level signal, waking up the vehicle's engine management system.

[0035] S2. When the vehicle power is in the off position, the vehicle's engine management system is awakened by the refueling button, and the interface is set to ensure the continuous operation of the engine management system and determine whether the vehicle meets the preconditions for refueling. When the vehicle power is in the on position, if the vehicle is in a driving-permitted state and the vehicle's electronic parking brake system is engaged, or if the vehicle is in a driving-disallowed state, determine whether the vehicle meets the preconditions for refueling.

[0036] Furthermore, the engine management system is provided with a rear operation interface. When the rear operation interface is set, the engine management system is woken up after a preset delay to ensure that the engine management system continues to work when the vehicle power is off. When the rear operation interface is reset, the engine management system stops running and enters a sleep state after a preset delay.

[0037] Furthermore, when the vehicle power is on, in addition to the situation described in step S2, if the vehicle is in a driving-permitted state but the vehicle's electronic parking brake system is not engaged, in order to ensure the safety of passengers' lives and property and prevent the vehicle from traveling unexpectedly during refueling, the execution process of the refueling control method is immediately terminated in this embodiment, and the driver is reminded to engage the vehicle's electronic parking brake system through the vehicle information system.

[0038] Furthermore, the prerequisite for refueling is that the following conditions are met simultaneously: during the refueling process, the oil-gas isolation valve and the high-pressure oil tank are working normally without malfunction, and the pressure inside the high-pressure oil tank is within a preset range.

[0039] S3. When the vehicle meets the preconditions for refueling, the engine management system controls the fuel filler cap lock motor to unlock and the oil-gas isolation valve to open, and identifies the opening and closing status of the fuel filler cap micro-movement door.

[0040] Furthermore, a sensor is provided next to the micro-movement door to accurately identify its open and closed state.

[0041] S4. When the micro-switch is detected to be open, refueling begins, and refueling ends according to the refueling end condition. If the vehicle power is off, the rear operating interface is reset after refueling ends, and the engine management system stops operating.

[0042] Furthermore, this embodiment can identify and handle the delayed door opening forgetting situation, specifically: if the micro door does not open within a preset time after the fuel filler cap lock motor is unlocked and the oil-gas isolation valve is opened, the fuel filler cap lock motor is locked and the oil-gas isolation valve is closed.

[0043] Furthermore, this embodiment can identify and handle the delayed door opening forgetting situation, specifically: after refueling begins, if the micro-motion small door is opened for more than a preset time, the refueling port cover lock motor is locked and the oil-gas isolation valve is closed.

[0044] By identifying and handling the delayed door opening forgetting condition, the problem of excessive oil vapor volatilization caused by forgetting to open the micro valve before refueling or forgetting to close the micro valve after refueling can be avoided.

[0045] Furthermore, after refueling begins, if the vehicle switches to a driving-allowed state or the vehicle speed exceeds a preset value while the micro-movement door is open, the refueling cap lock motor will be locked and the oil-gas isolation valve will be closed.

[0046] Furthermore, the refueling termination condition is that any of the following conditions are met: during the refueling process, a fault is diagnosed in the fuel-gas isolation valve or high-pressure fuel tank, and the micro-switch switches from open to closed. This fault information can also be sent to the driver via the vehicle information system, reminding the driver to repair or check it promptly, thereby avoiding potential dangers.

[0047] S5. The engine management system controls the fuel filler cap lock motor to lock and the oil-gas isolation valve to close.

[0048] The control method for the high-pressure fuel tank filler cap during refueling of a hybrid vehicle in this embodiment also includes identifying the refueling condition of moving the vehicle. The specific scenario corresponding to this condition is: when the vehicle is preparing to refuel and the filler valve is opened, the refueling location needs to be changed due to external reasons. The specific process is as follows: Figure 4 As shown, when the system detects that the vehicle power supply changes from on to off, the micro-movement door changes from open to closed, and the closing time is longer than the preset time, the engine management system's back-run interface is activated.

[0049] This embodiment also provides a control device for the high-pressure fuel tank filler cap during refueling of a motor vehicle, the structure of which is as follows: Figure 3 As shown, it includes a refueling button, EMS, a refueling port cover lock motor, an oil-gas isolation valve, and a micro-motion door for the refueling port cover.

[0050] The refueling button is used to generate a high level, which wakes up the vehicle's engine control system when the vehicle's power is in the off position.

[0051] The engine control system is equipped with a rear operation interface. When the rear operation interface is set or reset, the engine control system is awakened or enters hibernation. The engine control system is used to control the unlocking and locking of the filler cap lock motor and to control the opening and closing of the oil-gas isolation valve.

[0052] The micro-movement gate is used to reflect its opening and closing status to the engine control system through a sensor, so that the engine control system can make a series of control decisions.

[0053] This embodiment also provides a control system for the high-pressure fuel tank filler cap when refueling a hybrid vehicle. The system executes the above-described control method for the high-pressure fuel tank filler cap when refueling a hybrid vehicle.

[0054] This embodiment also provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the steps of the above-described method for controlling the high-pressure fuel tank filler cap during refueling of a hybrid vehicle.

[0055] Example 2

[0056] This embodiment provides another method for controlling the high-pressure fuel tank filler cap during refueling of a hybrid vehicle, the process of which is as follows: Figure 2 As shown, it includes:

[0057] T1. Press the refueling button.

[0058] T2. Determine the vehicle's power supply level.

[0059] If the vehicle's power supply is in the off position, set the interface and proceed to the next step.

[0060] If the vehicle's power supply is in the "on" position, determine whether the vehicle is in a driving-permissible state and whether the vehicle's electronic parking brake system is engaged. If the vehicle is in a driving-permissible state and the vehicle's electronic parking brake system is engaged, or if the vehicle is in a driving-disallowed state, proceed to the next step.

[0061] If the vehicle is in a driving-allowed state and the vehicle's electronic parking brake system is not engaged, the driver will be alerted via the vehicle information system.

[0062] T3. Determine if the pre-refueling conditions are met. The pre-refueling conditions are that the following conditions are met simultaneously: the oil-gas isolation valve is not diagnosed as faulty; the high-pressure fuel tank is not diagnosed as faulty; and the pressure of the high-pressure fuel tank is within the preset range. If the pre-refueling conditions are met, proceed to the next step.

[0063] T4. Unlock the fuel filler cap, lock the motor, and open the oil-gas isolation valve.

[0064] T5. Determine whether the micro-movement door is open. A sensor is installed next to the micro-movement door to accurately identify its open or closed state.

[0065] If the micro-movement door does not open after the preset time, proceed to step T8.

[0066] If the small door opens, proceed to the next step.

[0067] T6, Start refueling.

[0068] T7. Determine if the refueling end condition is met. If it is, proceed to the next step. The refueling end condition is any of the following: the oil-gas isolation valve is diagnosed as faulty; the high-pressure fuel tank is diagnosed as faulty; the micro-motion door changes from open to closed.

[0069] If the refueling end conditions are not met, further determine whether other refueling end conditions are met, including: with the micro-movement door open, the vehicle switches to a driving-allowed state and the vehicle speed is greater than a preset value.

[0070] If other refueling end conditions are met, proceed to the next step; if other refueling end conditions are not met, determine whether the micro-gate is closed after a preset event. If the micro-gate is not closed after a preset time, proceed to the next step.

[0071] T8. Lock the filler cap, lock the motor, and close the oil-gas isolation valve.

[0072] T9, End of refueling.

[0073] In summary, this invention provides a control method and system for the high-pressure fuel tank filler cap of a hybrid vehicle, applicable to PHEV hybrid vehicles. When the vehicle power is in the ON or OFF position, the system controls the high-pressure fuel tank filler cap lock motor and the oil-gas isolation valve via the filler button, engine management system, and micro-motion door of the filler cap. This solves the problem of the engine failing to start when the hybrid vehicle is in pure electric mode, causing oil vapor to evaporate outside the vehicle.

[0074] It should be noted that, depending on the implementation needs, the various steps / components described in this application can be broken down into more steps / components, or two or more steps / components or parts of the operation of steps / components can be combined into new steps / components to achieve the purpose of this invention.

[0075] The order of the steps in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0076] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A method for controlling the high-pressure fuel tank filler cap during refueling of a hybrid vehicle, characterized in that, The vehicle engine management system has a rear-running interface; this method includes: After the vehicle's refueling button is pressed, determine whether the vehicle's power is on or off. When the vehicle power is off, the vehicle's engine management system is activated by the refueling button, setting the aforementioned operating interface to ensure the continuous operation of the engine management system and determine whether the vehicle meets the preconditions for refueling; when the vehicle power is on, if the vehicle is in a driving-permitted state and the vehicle's electronic parking brake system is engaged, or if the vehicle is in a driving-disallowed state, determine whether the vehicle meets the preconditions for refueling. When the vehicle meets the preconditions for refueling, the engine management system controls the fuel filler cap lock motor to unlock and the oil-gas isolation valve to open, and identifies the opening and closing status of the fuel filler cap micro-movement door. When the micro-switch is detected to be open, refueling begins, and the refueling is completed according to the refueling end condition. If the vehicle power is off, after the refueling is completed, the rear operation interface is reset and the engine management system is stopped. The engine management system controls the fuel filler cap lock motor to lock and the fuel-air isolation valve to close.

2. The method for controlling the high-pressure fuel tank filler cap during refueling of a hybrid vehicle according to claim 1, characterized in that, When the vehicle power is on, if the vehicle is in a driving-allowed state and the vehicle's electronic parking brake system is not engaged, the information that the vehicle's electronic parking brake system is not engaged will be sent to the driver via the vehicle information system.

3. The method for controlling the high-pressure fuel tank filler cap during refueling of a hybrid vehicle according to claim 1, characterized in that, The prerequisite for refueling is that the following conditions must be met simultaneously: the oil-gas isolation valve is not diagnosed as faulty; the high-pressure oil tank is not diagnosed as faulty; and the pressure of the high-pressure oil tank is within a preset range.

4. The method for controlling the high-pressure fuel tank filler cap during refueling of a hybrid vehicle according to claim 1, characterized in that, If the micro-switch door fails to open within a preset time after the fuel filler cap lock motor is unlocked and the oil-gas isolation valve is opened, the fuel filler cap lock motor will be locked and the oil-gas isolation valve will be closed.

5. The method for controlling the high-pressure fuel tank filler cap during refueling of a hybrid vehicle according to claim 1, characterized in that, After refueling begins, if the vehicle switches to a driving-allowed state and the vehicle speed exceeds the preset value while the micro-motion door is open, the refueling cap lock motor will be locked and the oil-gas isolation valve will be closed.

6. The method for controlling the high-pressure fuel tank filler cap during refueling of a hybrid vehicle according to claim 5, characterized in that, After refueling begins, if the micro-switch door remains open for longer than the preset time, the refueling port cover will lock the motor and the oil-gas isolation valve will be closed.

7. The method for controlling the high-pressure fuel tank filler cap during refueling of a hybrid vehicle according to claim 1, characterized in that, The refueling termination condition is to meet any of the following conditions: the oil-gas isolation valve is diagnosed as faulty; the high-pressure oil tank is diagnosed as faulty; the micro-motion door changes from open to closed.

8. The method for controlling the high-pressure fuel tank filler cap during refueling of a hybrid vehicle according to claim 6, characterized in that, During vehicle operation, when the micro-movement door is detected to be continuously open within a preset time and the vehicle power switch is changed from on to off, the rear operation interface of the engine management system is activated.

9. A control system for the high-pressure fuel tank filler cap during refueling of a hybrid vehicle, characterized in that, The system implements the control method for the high-pressure fuel tank filler cap when refueling a hybrid vehicle as described in any one of claims 1-8.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by the processor, it implements the steps of the method for controlling the high-pressure fuel tank filler cap during refueling of a hybrid vehicle as described in any one of claims 1-8.

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