High-oil-level refueling limited exhaust valve clamping stagnation diagnosis control method and control system

Abstract

The invention relates to the technical field of automobile part fault judgment, in particular to a high-oil-level refueling limited exhaust valve clamping stagnation diagnosis control method and system. The method includes the steps that when an engine operates normally, a carbon tank electromagnetic valve and an oil tank isolation valve are in an open state; acquiring the current oil level in the oil tank, and judging whether the oil tank is at a high oil level; if the oil tank is at the high oil level, acquiring the current oil tank pressure and judging whether the oil tank is in a high-pressure state; if in the high-pressure state, judging that the current refueling limited exhaust valve is in a clamping stagnation state; and when the refueling quantity-limiting exhaust valve is in the clamping stagnation state, the carbon tank electromagnetic valve, the oil tank isolation valve and the leakage diagnosis pump are operated, and clamping stagnation of the refueling quantity-limiting exhaust valve is relieved. Whether the refueling limiting exhaust valve is in the clamping stagnation state or not can be accurately obtained under the high oil level condition, operation can be conducted on the clamping stagnation state of the refueling limiting exhaust valve subsequently, and the state is relieved.

Description

Technical Field

[0001] The invention relates to the technical field of automobile component fault judgment, and in particular to a high-oil-level refueling limited exhaust valve stuck diagnosis control method and control system. Background Art

[0002] In the prior art, in the fuel tank module of the automobile, the fuel tank needs to be equipped with a carbon canister. The carbon canister absorbs the fuel vapor in the fuel tank when the fuel vapor pressure in the fuel tank is high. After the engine is started, the carbon canister is desorbed and discharged into the fuel tank by inhaling fresh air from the outside. In addition to the carbon canister, the fuel tank also needs to be equipped with a refueling limit exhaust valve (FLVV). The refueling limit exhaust valve is a product installed on the automobile fuel tank to control the refueling amount of the automobile and the exhaust of air during refueling. It is a new product to adapt to the National VI Regulations. When refueling, the refueling limit exhaust valve can control the refueling amount of the fuel to prevent the fuel tank from being overfilled, thereby avoiding fuel overflow and possible pollution. When venting and replenishing air in the tank, the refueling limited exhaust valve is responsible for exhausting the air in the tank and replenishing necessary air to maintain the pressure balance in the tank; in addition, PEHV or REV tanks are generally equipped with a fuel tank isolation valve (FITV). The function of the fuel tank isolation valve is to control the connection between the fuel tank and the carbon canister to ensure that the fuel vapor is introduced into the carbon canister for treatment under specific conditions, thereby reducing the emission of pollutants. When the pressure in the tank increases or the carbon canister is close to saturation, the fuel tank isolation valve will open to introduce excess fuel vapor into the carbon canister for treatment. During the refueling process, the fuel tank isolation valve is opened, and the FLVV is closed in time after the tank is full to prevent fuel overflow.

[0003] The purpose of the refueling limited exhaust valve is to cut off the overflow of fuel vapor in time when the refueling gun jumps. However, in actual application, the refueling limited exhaust valve may be closed due to excessive oil waves. It is usually found that the refueling limited exhaust valve is closed due to the influence of oil waves when the vehicle is driving at a high oil level. When the refueling limited exhaust valve is closed, the internal pressure of the fuel tank is relatively high during driving, and the refueling limited exhaust valve is closed and cannot be opened. Even after the vehicle is parked for several hours, the pressure cannot be released and the refueling limited exhaust valve cannot be opened. There is currently no good diagnostic method for this situation. Once the refueling limited exhaust valve is closed and cannot be opened, the following faults will occur:

[0004] 1. Unable to refuel: Because the internal pressure of the fuel tank cannot be released quickly, the most direct problem is that the refueling gun jumps and the fuel cannot be added;

[0005] 2. Misjudgment: Since the fuel tank is closed, the OBD system of the PHEV / REV model will judge that the fuel tank isolation valve is stuck;

[0006] 3. High desorption fault: Since the fuel tank is closed, the engine desorption flow is insufficient, causing a diagnostic fault of low desorption flow. Summary of the invention

[0007] The purpose of the present invention is to solve the deficiencies of the above-mentioned background technology and to provide a high oil level refueling limited exhaust valve stuck diagnosis control method and control system.

[0008] The technical solution of the present invention is: a high oil level refueling limited exhaust valve stuck diagnosis control method, comprising:

[0009] When the engine is running normally and the carbon canister solenoid valve and fuel tank isolation valve are in the open state;

[0010] Get the current oil level in the tank and determine whether the tank is at a high oil level;

[0011] If the fuel tank is at a high fuel level, obtain the current fuel tank pressure to determine whether it is in a high pressure state;

[0012] If it is in a high pressure state, it is determined that the current refueling limited exhaust valve is in a stuck state;

[0013] When the refueling limit exhaust valve is in a stuck state, operate the carbon canister solenoid valve, the fuel tank isolation valve and the leakage diagnosis pump to release the refueling limit exhaust valve from being stuck.

[0014] According to a high-oil-level refueling limited exhaust valve sticking diagnosis and control method provided in the present application, the method for determining whether the fuel tank is at a high oil level includes: if the current oil level in the fuel tank exceeds the set oil level, then it is determined that the fuel tank is at a high oil level, otherwise the fuel tank is not at a high oil level.

[0015] According to a high-oil-level refueling limited exhaust valve sticking diagnosis and control method provided in the present application, the method for determining whether it is in a high-pressure state includes: if the current pressure in the fuel tank exceeds the set pressure and is maintained for more than the set time, then it is determined that the fuel tank is in a high-pressure state, otherwise the fuel tank is not in a high-pressure state.

[0016] According to a high oil level refueling limited exhaust valve stuck diagnosis and control method provided in the present application, the method of operating the carbon canister solenoid valve when the refueling limited exhaust valve is in a stuck state includes: stopping the desorption flow diagnosis and closing the carbon canister solenoid valve.

[0017] According to a high oil level refueling limited exhaust valve stuck diagnosis and control method provided in the present application, the method for operating the fuel tank isolation valve when the refueling limited exhaust valve is in a stuck state includes: maintaining the fuel tank isolation valve in an open state.

[0018] According to a high oil level refueling limited exhaust valve stuck diagnosis control method provided in the present application, the method for operating a leakage diagnosis pump when the refueling limited exhaust valve is in a stuck state includes: starting the leakage diagnosis pump to operate the leakage diagnosis pump at maximum power for a set period of time.

[0019] The present application also provides a high oil level refueling limited exhaust valve stuck diagnosis control system, the control system is operated according to the above-mentioned high oil level refueling limited exhaust valve stuck diagnosis control method, including:

[0020] An initial condition judgment module, which is used to judge whether the current vehicle meets the initial conditions that the engine is operating normally and the carbon canister solenoid valve and the fuel tank isolation valve are in an open state;

[0021] A high oil level judgment module, which is used to collect the oil level of the oil tank and judge whether the oil tank is in a high oil level state when the initial conditions are met;

[0022] A high-pressure judgment module, which is used to collect the fuel tank pressure when the fuel tank is in a high oil level state to determine whether the fuel tank is in a high-pressure state;

[0023] a stuck judgment module, wherein the stuck judgment module judges whether the refueling limited exhaust valve is in a stuck state based on a high oil level state and a high pressure state of the oil tank;

[0024] The regulating module is used to operate the carbon canister solenoid valve, the fuel tank isolation valve and the leakage diagnosis pump when the refueling limited exhaust valve is in a stuck state, so as to release the stuck state of the refueling limited exhaust valve.

[0025] According to a high-oil-level refueling limited exhaust valve sticking diagnosis and control system provided by the present application, the high-oil-level judgment module judges that the oil tank is at a high oil level when the oil level in the oil tank exceeds the set oil level, and judges that the oil tank is not at a high oil level when the oil level in the oil tank does not exceed the set oil level.

[0026] According to a high-oil-level refueling limited exhaust valve stuck diagnosis and control system provided by the present application, the high-pressure judgment module judges that the fuel tank is in a high-pressure state when the pressure in the current fuel tank exceeds the set pressure and is maintained for more than the set time, otherwise it judges that the fuel tank is not in a high-pressure state.

[0027] According to a high oil level refueling limited exhaust valve stuck diagnosis and control system provided by the present application, the stuck judgment module is used to judge whether the refueling limited exhaust valve is in a stuck state when the fuel tank is in a high oil level state and a high pressure state.

[0028] According to a high oil level refueling limited exhaust valve stuck diagnosis and control system provided by the present application, the adjustment module includes:

[0029] A first operating module, the first operating module is used to open the carbon canister solenoid valve and stop the desorption flow diagnostic operation when the refueling limited exhaust valve is in a stuck state;

[0030] a second operating module, the second operating module being used to open the fuel tank isolation valve when the refueling limited exhaust valve is in a stuck state;

[0031] A third operating module is used for controlling the leakage diagnosis pump to start and operate at maximum power for a set time period when the refueling limited exhaust valve is in a stuck state.

[0032] The advantages of the present application are as follows: 1. The present application determines whether the refueling limited exhaust valve is stuck by judging the oil level and pressure of the vehicle's fuel tank, thereby avoiding the problem of being unable to know when the refueling limited exhaust valve is stuck under high oil level conditions. The present application adopts countermeasures to solve the problem of the stuck state of the refueling limited exhaust valve under high oil level conditions, avoids the problem of failure to refuel, misjudgment and high desorption caused by the stuck refueling limited exhaust valve, greatly reduces the failure rate, improves the fault tolerance of components, avoids the increase of dynamic leakage of the valve body due to the inability of the valve body hardware to ensure accurate tank volume control, thereby avoiding the problem of liquid oil entering the carbon canister, resulting in possible engine mixture being too rich or even causing carbon powder failure and excessive emissions, reduces unnecessary parts replacement, and has great promotion value;

[0033] 2. The judgment method of the present application for high oil level is very simple. By setting the set oil level of the fuel tank, and then collecting the oil level in the fuel tank in real time, as long as the current oil level exceeds the set oil level, it can be considered that the fuel tank is in a high oil level state. At this time, the oil level in the fuel tank may cause the refueling limit exhaust valve to be stuck. By accurately identifying whether it is in a high oil level state, judgment and identification are carried out, which is convenient for subsequent further operations;

[0034] 3. The judgment method of the fuel tank high pressure state in the present application is very simple. By setting the set pressure and set time of the fuel tank, when the fuel tank pressure exceeds the set pressure, there may be a fuel tank high pressure situation. When the fuel tank pressure exceeds the set pressure for a longer time than the set time, it can be considered that it is not a misjudgment, but a fuel tank high pressure situation has indeed occurred. The judgment method of the present application is accurate, which provides a basis for the subsequent judgment of the jamming of the refueling limited exhaust valve;

[0035] 4. When the refueling limited exhaust valve is stuck, the present application will directly stop the desorption flow diagnosis and close the carbon canister solenoid valve, so as to avoid the desorption flow diagnosis and carbon canister solenoid valve failure. First, the problem of the refueling limited exhaust valve being stuck is solved. The refueling limited exhaust valve is no longer stuck. Opening the desorption flow diagnosis and the carbon canister solenoid valve again can eliminate the problem that may be caused by the refueling limited exhaust valve being stuck, thereby reducing the failure rate.

[0036] 5. This application will open the fuel tank isolation valve in advance when the refueling limited exhaust valve is stuck. The purpose of opening the fuel tank isolation valve is to facilitate the subsequent handling of the refueling limited exhaust valve. After the fuel tank isolation valve is opened, the inside and outside of the fuel tank are connected, which is convenient for the subsequent unblocking of the refueling limited exhaust valve;

[0037] 6. In the case of a stuck refueling limited exhaust valve, the present application starts the leakage diagnosis pump, makes the leakage diagnosis pump run at maximum power for a set time, blows open the stuck refueling limited exhaust valve through the leakage diagnosis pump, and releases the stuck state of the refueling limited exhaust valve. The existing equipment structure can automatically release the stuck refueling limited exhaust valve, and the operation is simple and convenient.

[0038] 7. The present application also provides a control system. The control system of the present application is operated according to the above-mentioned high oil level refueling limited exhaust valve stuck diagnosis control method. The control system of the present application can be integrated into the vehicle control system. The design structure is simple and reasonable. The control modules cooperate with each other to solve the problem of high oil level refueling limited exhaust valve stuck.

[0039] 8. The overall control strategy of the high oil level judgment module of the present application is very simple. It is integrated in the control system and can accurately judge whether the current oil tank is at a high oil level;

[0040] 9. The high-pressure judgment module of the present application is integrated in the control system, and can judge whether it is in a high-pressure state by identifying the pressure in the fuel tank and the pressure maintenance time. The overall judgment method is simple;

[0041] 10. The stuck judgment module of the present application can identify whether the current refueling limited exhaust valve is stuck by integrating the judgment results of the high pressure judgment module and the high oil level judgment module;

[0042] 11. The regulating module of the present application integrates multiple operating modules, each of which performs different operations respectively, which can eliminate the faults of other structural components to the greatest extent, facilitate the removal of the stuck state of the refueling limited exhaust valve, and is simple and convenient to operate.

[0043] The control method of the present application can automatically identify the state of the refueling limited exhaust valve, and can accurately determine whether the refueling limited exhaust valve is in a stuck state under high oil level conditions. Subsequently, operations can be performed on the stuck state of the refueling limited exhaust valve to release this state, which greatly reduces the failure rate and reduces the replacement of unnecessary parts, and has great promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 : Schematic diagram of the control flow of this application. DETAILED DESCRIPTION

[0045] The embodiments of the present invention are described in detail below, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0046] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0047] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0048] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0049] The present application relates to a high-oil-level refueling limited exhaust valve stuck diagnosis and control method. The present application is for a refueling limited exhaust valve at a high oil level. When the oil level in the fuel tank is at a high oil level, the refueling limited exhaust valve may be stuck due to the influence of oil waves. If this stuck state is not resolved, many faults will be caused, such as the inability to refuel, misjudgment, high desorption faults and other problems. Currently, there is no good way to solve this problem. The present application is to operate in response to the situation of such a high-oil-level refueling limited exhaust valve stuck. By accurately identifying whether the refueling limited exhaust valve is stuck, the refueling limited exhaust valve is operated when it is stuck, the stuck problem is resolved, and many faults are avoided. The entire control method is simple, and there is no need to introduce other hardware equipment for heating. It only needs to integrate the corresponding control program in the control system of the car.

[0050] Specifically, Figure 1 As shown, a high oil level refueling limited exhaust valve stuck diagnosis and control method of the present application is carried out according to the following steps:

[0051] S1: When the engine is running normally and the carbon canister solenoid valve and fuel tank isolation valve are in the open state;

[0052] This application is aimed at the diagnosis and judgment of the refueling limited exhaust valve under normal engine operation. Only when the engine is operating normally, the oil wave existing in the high oil level will cause the refueling limited exhaust valve to be stuck. Under normal refueling conditions, the engine stopping operation is not within the scope of consideration of this application.

[0053] The judgment that the carbon canister solenoid valve and the fuel tank isolation valve are in the open state is to avoid high pressure in the fuel tank caused by the carbon canister solenoid valve and the fuel tank isolation valve being closed, that is, to eliminate the problem of the carbon canister solenoid valve and the fuel tank isolation valve to avoid misjudgment;

[0054] S2, obtaining the current oil level in the fuel tank and determining whether the fuel tank is at a high oil level;

[0055] There are many ways to obtain the oil level in the fuel tank. The fuel tank itself has an oil level measurement device structure. By obtaining the oil level in the fuel tank, it is determined whether the fuel tank is at a high oil level, which provides a basis for subsequent judgment and determination;

[0056] If the oil level in the fuel tank is not in a high oil level state, the process returns to the step of judging the normal operation of the engine for re-identification;

[0057] S3, if the fuel tank is at a high fuel level, obtain the current fuel tank pressure to determine whether it is in a high pressure state;

[0058] To further judge the pressure of the fuel tank, the high oil level of the refueling limit exhaust valve needs to meet the conditions of high oil level and excessive pressure. The problem of the refueling limit exhaust valve being stuck will occur when the pressure in the fuel tank is too high and the fuel level in the fuel tank is too high. Therefore, a special step for checking the fuel tank pressure is designed;

[0059] The method of obtaining the fuel tank pressure is very simple. At present, the fuel tanks of conventional vehicles are basically equipped with pressure sensors, which monitor the pressure value of the fuel tank in real time;

[0060] If the fuel tank is not in a high pressure state, the process returns to the step of judging whether the carbon canister solenoid valve and the fuel tank isolation valve are in an open state for re-identification;

[0061] S4, if it is in a high pressure state, it is determined that the current refueling limited exhaust valve is in a stuck state;

[0062] The sticking of the refueling limited exhaust valve in the present application is a trigger judgment, that is, as long as the above conditions are met, the engine is running normally, the carbon canister solenoid valve and the fuel tank isolation valve are in the open state, and the fuel tank is in a high oil level and high pressure state, in this state, the refueling limited exhaust valve may be stuck. The present application believes that in this state, regardless of whether the refueling limited exhaust valve is really stuck, the refueling limited exhaust valve is considered to be stuck at this time;

[0063] S5. When the refueling limited exhaust valve is in a stuck state, operate the carbon canister solenoid valve, the fuel tank isolation valve and the leakage diagnosis pump to release the stuck state of the refueling limited exhaust valve;

[0064] This application is not only to simply determine whether the refueling limited exhaust valve is stuck, but also to operate the refueling limited exhaust valve according to the stuck state, to release the stuck state of the refueling limited exhaust valve, and to avoid malfunction;

[0065] During this process, the present application processes the carbon canister solenoid valve and the fuel tank isolation valve in order to eliminate the influence and avoid the occurrence of failures, and operates the leakage diagnosis pump in order to release the stuck state of the refueling limit exhaust valve.

[0066] Embodiment 1: This embodiment optimizes the above-mentioned method for determining whether the fuel tank is at a high oil level. Specifically, this embodiment obtains the oil level through an oil level sensor installed in the fuel tank, and compares the obtained real-time oil level with the set oil level. If the current oil level in the fuel tank exceeds the set oil level, it is determined that the fuel tank is at a high oil level, otherwise the fuel tank is not at a high oil level.

[0067] The set oil level in this embodiment is 85% to 95%, and the specific value can be adjusted accordingly according to the structure of the oil tank as long as the use requirements are met.

[0068] If the oil level in the fuel tank exceeds the set oil level, it means that there is too much oil in the fuel tank and the oil level is too high, which may cause the refueling limit exhaust valve to get stuck.

[0069] Embodiment 2: This embodiment optimizes the above method for determining whether the fuel tank is in a high-pressure state. Specifically, this embodiment detects the pressure by installing a pressure sensor in the fuel tank, and compares the obtained fuel tank pressure with the set pressure. If the fuel tank pressure fluctuates, that is, it exceeds the set pressure at a certain moment, but the fuel tank pressure is lower than the set pressure at other times, this situation cannot be used as a basis for determining whether the fuel tank is in a high-pressure state. This embodiment introduces time calculation for the determination of the high-pressure state of the fuel tank. That is, if the current pressure in the fuel tank exceeds the set pressure and the maintenance time exceeds the set time, it is determined that the fuel tank is in a high-pressure state, otherwise the fuel tank is not in a high-pressure state.

[0070] The fuel tank is in a high-pressure state only if the pressure in the current fuel tank exceeds the set pressure and the maintenance time exceeds the set time. Otherwise, the fuel tank is determined to be not in a high-pressure state. The set pressure of this embodiment is 5KPa to 7.5KPa, and the specific value is set according to the structure of the fuel tank and the refueling limit exhaust valve; the set time of this embodiment is 45s to 60s, and the specific value can be selected according to actual needs to meet the use.

[0071] Embodiment three: This embodiment optimizes the operating method after the refueling limit exhaust valve is determined to be in a stuck state. Specifically, when the refueling limit exhaust valve is in a stuck state, it is necessary to operate the carbon canister solenoid valve, the fuel tank isolation valve and the leakage diagnosis pump. The operation of the carbon canister solenoid valve and the fuel tank isolation valve is convenient for the subsequent release of the stuck state of the refueling limit exhaust valve, and also for avoiding failures of the above-mentioned structures.

[0072] Specifically, the operation method of the carbon canister solenoid valve includes: stopping the desorption flow diagnosis and closing the carbon canister solenoid valve. Because the refueling limit exhaust valve is stuck at this time, the desorption flow diagnosis is meaningless and the diagnostic data is problematic. Therefore, when operating the carbon canister solenoid valve, it is necessary to stop the desorption flow diagnosis and close the carbon canister solenoid valve (the purpose of closing the carbon canister solenoid valve is to avoid the desorption when it is opened to affect the blowing flow of the leak diagnosis pump).

[0073] The method of operating the fuel tank isolation valve when the refueling limit exhaust valve is in a stuck state includes: maintaining the fuel tank isolation valve in an open state (the fuel tank isolation valve cuts off the passage between the fuel tank and the carbon canister, and the leak diagnosis pump can only blow air into the fuel tank when it is in an open state. The fuel tank isolation valve is closed for a long time in the vehicle's electric mode, thereby reducing emissions. This is also the reason why a high-pressure fuel tank is used in PHEV or REV).

[0074] The method of operating the leak diagnostic pump when the refueling limited exhaust valve is in a stuck state includes: turning on the leak diagnostic pump to make the leak diagnostic pump run at maximum power for a set time. The leak diagnostic pump blows air into the fuel tank, and the leak diagnostic pump blowing air can release the stuck state of the refueling limited exhaust valve (after the refueling limited exhaust valve is stuck, the float inside the valve body cannot be reopened by its own gravity due to the internal pressure of the fuel tank, so an external force with a certain pressure is required to push the float down from the outside for ventilation, and the blowing of the leak diagnostic pump can just be used to form this external force. Through experiments, it was found that the maximum internal pressure of the fuel tank is about 5KPA, while the leak diagnostic pump's own pressure can reach 7.9KPA. Coupled with the gravity assistance of the float itself, the problem of the refueling limited exhaust valve being stuck can be completely solved by blowing it through).

[0075] The set duration of this embodiment is 15s to 20s, and the specific time can be set according to actual needs. The operation of this embodiment is performed in cycles. After the leakage diagnosis pump is turned on and runs at maximum power for a set period of time, the fuel tank high-pressure state judgment and identification step is returned to the fuel tank high-pressure state judgment and identification step to re-detect the stuck state of the refueling limited exhaust valve. If the sticking problem still exists, the leakage diagnosis pump is continued to be turned on according to the above process to run at maximum power for a set period of time, and this process is repeated until the refueling limited exhaust valve is out of the stuck state.

[0076] In actual operation, Figure 1 As shown, when the engine is running normally and the carbon canister solenoid valve and the fuel tank isolation valve are in the open state; obtain the current oil level in the fuel tank, compare the obtained real-time oil level with the set oil level, if the current oil level in the fuel tank exceeds the set oil level, it is judged that the fuel tank is in a high oil level, otherwise the fuel tank is not in a high oil level; if the fuel tank is in a high oil level state, collect the current fuel tank pressure, if the current pressure in the fuel tank exceeds the set pressure and the maintenance time exceeds the set time, it is judged that the fuel tank is in a high pressure state, otherwise the fuel tank is not in a high pressure state; if it is in a high pressure state, it is judged that the current refueling limited exhaust valve is in a stuck state; when the refueling limited exhaust valve is in a stuck state, stop the desorption flow diagnosis and close the carbon canister solenoid valve, maintain the fuel tank isolation valve in the open state, start the leakage diagnosis pump to make the leakage diagnosis pump run at maximum power for the set time, and release the stuck state of the refueling limited exhaust valve.

[0077] The present application also provides a high-oil-level refueling limited exhaust valve stuck diagnosis control system, comprising an initial condition judgment module, a high oil level judgment module, a high pressure judgment module, a stuck judgment module and an adjustment module, wherein the initial condition judgment module is used to judge whether the current vehicle meets the initial conditions that the engine is operating normally and the carbon canister solenoid valve and the fuel tank isolation valve are in an open state; the high oil level judgment module is used to collect the fuel tank oil level when the initial conditions are met to judge whether the fuel tank is in a high oil level state; the high pressure judgment module is used to collect the fuel tank pressure when the fuel tank is in a high oil level state to judge whether the fuel tank is in a high pressure state; the stuck judgment module judges whether the refueling limited exhaust valve is in a stuck state based on the high oil level state and the high pressure state of the fuel tank; the adjustment module is used to operate the carbon canister solenoid valve, the fuel tank isolation valve and the leakage diagnosis pump when the refueling limited exhaust valve is in a stuck state to release the stuck refueling limited exhaust valve.

[0078] Among them, the high oil level judgment module judges that the fuel tank is at a high oil level when the oil level in the fuel tank exceeds the set oil level, and judges that the fuel tank is not at a high oil level when the oil level in the fuel tank does not exceed the set oil level; the high pressure judgment module judges that the fuel tank is in a high pressure state when the current pressure in the fuel tank exceeds the set pressure and the maintenance time exceeds the set time, otherwise it judges that the fuel tank is not in a high pressure state; the stuck judgment module is used to judge that the refueling limit exhaust valve is in a stuck state when the fuel tank is in a high oil level state and a high pressure state.

[0079] The regulating module includes a first operating module, a second operating module and a third operating module. The first operating module is used to open the carbon canister solenoid valve and stop the desorption flow diagnosis operation when the refueling limited exhaust valve is in a stuck state; the second operating module is used to open the fuel tank isolation valve when the refueling limited exhaust valve is in a stuck state; and the third operating module is used to control the leakage diagnosis pump to open and run at maximum power for a set time when the refueling limited exhaust valve is in a stuck state.

[0080] An embodiment of the present application provides a computer-readable storage medium, including: the computer-readable storage medium stores computer instructions; when the computer instructions are executed on a computing device, the computing device executes the operations in the above-mentioned embodiments.

[0081] An embodiment of the present application provides a computer program product including instructions, including a computer program or instructions. When the computer program or instructions are executed on a computer, the computing device is enabled to perform the operations in the above-mentioned embodiments.

[0082] The above embodiments are implemented in whole or in part by software, hardware, firmware or any other combination. When implemented by software, the above embodiments are implemented in whole or in part in the form of a computer program product. The computer program product includes at least one computer instruction. When the computer program instruction is loaded or executed on a computer, the process or function according to the embodiment of the present invention is generated in whole or in part. The computer is a general-purpose computer, a special-purpose computer, a computer network, or other programming device. The computer instructions are stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions are transmitted from one website, computer, server or data center to another website, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium is any medium that can be accessed by a computer or a data storage node such as a server, data center, etc. that contains at least one medium set. The medium is a magnetic medium (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a high-density digital video disc (DVD), or a semiconductor medium.

[0083] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A high oil level refueling limited exhaust valve stuck diagnosis and control method, characterized by: include, When the engine is running normally and the carbon canister solenoid valve and fuel tank isolation valve are in the open state; Get the current oil level in the tank and determine whether the tank is at a high oil level; If the fuel tank is at a high fuel level, obtain the current fuel tank pressure to determine whether it is in a high pressure state; If it is in a high pressure state, it is determined that the current refueling limited exhaust valve is in a stuck state; When the refueling limit exhaust valve is in a stuck state, operate the carbon canister solenoid valve, the fuel tank isolation valve and the leakage diagnosis pump to release the refueling limit exhaust valve from being stuck.

2. A high oil level refueling limited exhaust valve stuck diagnosis and control method as claimed in claim 1, characterized in that: The method for determining whether the fuel tank is at a high fuel level includes: if the current fuel level in the fuel tank exceeds the set fuel level, determining that the fuel tank is at a high fuel level, otherwise determining that the fuel tank is not at a high fuel level.

3. A high oil level refueling limited exhaust valve stuck diagnosis and control method as claimed in claim 1, characterized in that: The method for determining whether the fuel tank is in a high pressure state includes: if the current pressure in the fuel tank exceeds the set pressure and the maintenance time exceeds the set time, then the fuel tank is determined to be in a high pressure state, otherwise the fuel tank is not in a high pressure state.

4. A high oil level refueling limited exhaust valve stuck diagnosis and control method as claimed in claim 1, characterized in that: The method for operating the carbon canister solenoid valve when the refueling limited exhaust valve is in a stuck state includes: stopping the desorption flow diagnosis and closing the carbon canister solenoid valve.

5. The high oil level refueling limited exhaust valve stuck diagnosis and control method as claimed in claim 1, characterized in that: The method for operating the leakage diagnosis pump when the refueling limited exhaust valve is in a stuck state includes: starting the leakage diagnosis pump to operate the leakage diagnosis pump at maximum power for a set time period.

6. A high oil level refueling limited exhaust valve stuck diagnosis and control system, characterized by: The control system is operated according to a high oil level refueling limited exhaust valve stuck diagnosis control method as claimed in any one of claims 1 to 5, include, An initial condition judgment module, which is used to judge whether the current vehicle meets the initial conditions that the engine is operating normally and the carbon canister solenoid valve and the fuel tank isolation valve are in an open state; A high oil level judgment module, which is used to collect the oil level of the oil tank and judge whether the oil tank is in a high oil level state when the initial conditions are met; A high-pressure judgment module, which is used to collect the fuel tank pressure when the fuel tank is in a high oil level state to determine whether the fuel tank is in a high-pressure state; a stuck judgment module, wherein the stuck judgment module judges whether the refueling limited exhaust valve is in a stuck state based on a high oil level state and a high pressure state of the oil tank; The regulating module is used to operate the carbon canister solenoid valve, the fuel tank isolation valve and the leakage diagnosis pump when the refueling limited exhaust valve is in a stuck state, so as to release the stuck state of the refueling limited exhaust valve.

7. A high oil level refueling limited exhaust valve stuck diagnosis and control system as claimed in claim 6, characterized in that: The high oil level judgment module judges that the oil tank is at a high oil level when the oil level in the oil tank exceeds the set oil level, and judges that the oil tank is not at a high oil level when the oil level in the oil tank does not exceed the set oil level.

8. A high oil level refueling limited exhaust valve stuck diagnosis and control system as claimed in claim 6, characterized in that: The high-pressure judgment module judges that the fuel tank is in a high-pressure state when the current pressure in the fuel tank exceeds the set pressure and is maintained for more than the set time, otherwise it judges that the fuel tank is not in a high-pressure state.

9. A high oil level refueling limited exhaust valve stuck diagnosis and control system as claimed in claim 6, characterized in that: The sticking judgment module is used to judge whether the refueling limited exhaust valve is in a stuck state when the fuel tank is in a high oil level state and a high pressure state.

10. A high oil level refueling limited exhaust valve stuck diagnosis and control system as claimed in claim 6, characterized in that: The adjustment module includes: A first operating module, the first operating module is used to open the carbon canister solenoid valve and stop the desorption flow diagnostic operation when the refueling limited exhaust valve is in a stuck state; a second operating module, the second operating module being used to open the fuel tank isolation valve when the refueling limited exhaust valve is in a stuck state; A third operating module is used for controlling the leakage diagnosis pump to start and operate at maximum power for a set time period when the refueling limited exhaust valve is in a stuck state.

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