A pressure relief valve control method, system, vehicle and medium

Abstract

The present application discloses a pressure relief valve control method, system, vehicle and medium. By acquiring the current fuel tank state and state control information, the current fuel tank state is adjusted according to the state control information to obtain the fuel tank working state; the pressure relief valve is controlled to be opened or closed according to the fuel tank working state, multiple working states are set for the high-pressure fuel tank, and different high-pressure fuel tank pressure relief valve management strategies are set for each working state. The current fuel tank state is adjusted according to the state control information, and the pressure, fuel tank liquid level and carbon canister concentration are comprehensively considered to control the pressure relief valve so that the high-pressure fuel tank pressure is maintained within a reasonable range. In this way, the effect of flexibly controlling the opening and closing of the pressure relief valve is achieved, and the risk of saturated carbon canister overflow is solved.

Description

Technical Field

[0001] The present application relates to the field of automobile technology, and in particular to a pressure relief valve control method, system, vehicle and medium. Background Art

[0002] Although plug-in hybrid electric vehicles have the advantages of energy saving and environmental protection, the chances of carbon tube flushing are reduced when driving on pure electricity, which easily leads to the risk of carbon tube oil and gas concentration being saturated and leaking into the atmosphere. Therefore, the mainstream solution of the plug-in hybrid electric vehicle fuel evaporation system uses a high-pressure fuel tank and is equipped with an isolation valve. When the engine is not working, the oil and gas are isolated in the high-pressure fuel tank, and the volatilization is suppressed by the higher bootstrap pressure. In the actual application process, on the one hand, it is necessary to consider that the pressure of the high-pressure fuel tank cannot be too large to prevent the high-pressure fuel tank from being damaged by high pressure. This requires that the isolation valve be opened as frequently as possible to keep the pressure of the high-pressure fuel tank low. On the other hand, considering the current saturation of the carbon canister and the amount of oil vapor in the tank, if the pressure is frequently relieved, the carbon canister will be filled, and the temperature drops at night after parking, and the oil vapor liquefaction property cannot be effectively utilized, which requires that the pressure of the high-pressure fuel tank cannot be maintained at a low state.

[0003] The current control logic is to open the isolation valve when the engine is started, and close the isolation valve when the engine is shut down. The current control logic only releases pressure when the pressure is higher than a certain level. The pressure control methods of the above two high-pressure tank pressure relief valves only have two relatively simple expert library control strategies, which cannot effectively utilize the pressure-maintaining capacity of the high-pressure tank to control the evaporated gas to achieve the best efficiency. At the same time, it does not take into account the current concentration of the carbon canister and the amount of evaporated gas in the tank. When the concentration of the carbon canister is high, there is a risk of carbon canister overflow.

[0004] Therefore, how to flexibly control the opening and closing of the pressure relief valve in order to solve the risk of carbon canister saturation and overflow is a technical problem that technicians in this field urgently need to solve. Summary of the invention

[0005] Based on the above problems, the present application provides a pressure relief valve control method, system, vehicle and medium, which can improve the correlation between the pressure relief valve control and the high-pressure fuel tank, and flexibly control the pressure relief valve to solve the risk of carbon canister saturation and overflow.

[0006] To solve the above problems, the technical solutions provided in the embodiments of the present application are as follows:

[0007] A first aspect of the present application provides a pressure relief valve control method, comprising:

[0008] Acquire current fuel tank status and status control information, wherein the status control information includes request information or status information for triggering fuel tank status adjustment;

[0009] Adjust the current fuel tank state according to the state control information to obtain the fuel tank working state;

[0010] The pressure relief valve is controlled to be opened or closed according to the working state of the oil tank.

[0011] Optionally, the fuel tank working state includes a diagnostic state, and the diagnostic state is used to indicate calling an on-board diagnostic system to control the pressure relief valve to be opened or closed;

[0012] The step of adjusting the current fuel tank state according to the state control information to obtain the fuel tank working state includes:

[0013] In response to the current fuel tank state being a balanced state and the state control information being a diagnosis request or a refueling request, the current fuel tank state is adjusted to a diagnosis state.

[0014] Optionally, the fuel tank working state includes a refueling state, and the refueling state is used to indicate a request to open the pressure relief valve;

[0015] The step of adjusting the current fuel tank state according to the state control information to obtain the fuel tank working state includes:

[0016] In response to the current fuel tank state being a diagnostic state, a high pressure state or an under pressure state, and the state control information being a refueling request, the current fuel tank state is adjusted to a refueling state.

[0017] Optionally, the oil tank working state includes a balanced state, and the balanced state is used to indicate a request to close the pressure relief valve;

[0018] The step of adjusting the current fuel tank state according to the state control information to obtain the fuel tank working state includes:

[0019] In response to the current fuel tank state being a refueling state and the state control information being refueling completion information, the current fuel tank state is adjusted to a balanced state.

[0020] Optionally, the oil tank working state includes a high-pressure state, and the high-pressure state is used to indicate a request to open the pressure relief valve;

[0021] The step of adjusting the current fuel tank state according to the state control information to obtain the fuel tank working state includes:

[0022] In response to the current fuel tank state being a balanced state and the state control information being a pressure higher than a first threshold, the current fuel tank state is adjusted to a high-pressure state, wherein the first threshold is a high-pressure relief pressure value determined according to the carbon canister concentration, the tank liquid level and the road roughness.

[0023] Optionally, the oil tank working state includes a balanced state, and the balanced state is used to indicate a request to close the pressure relief valve;

[0024] The step of adjusting the current fuel tank state according to the state control information to obtain the fuel tank working state includes:

[0025] In response to the current fuel tank state being a high pressure state and the state control information being a pressure lower than a second threshold, the current fuel tank state is adjusted to a balanced state, and the second threshold is a stop pressure relief pressure value determined according to the carbon canister concentration, the fuel tank liquid level and the road roughness.

[0026] Optionally, the oil tank working state includes an underpressure state, and the underpressure state is used to indicate a request to open the pressure relief valve;

[0027] The step of adjusting the current fuel tank state according to the state control information to obtain the fuel tank working state includes:

[0028] In response to the current fuel tank state being a balanced state and the state control information indicating that the pressure is lower than a third threshold, the current fuel tank state is adjusted to an underpressure state.

[0029] Optionally, the oil tank working state includes a balanced state, and the balanced state is used to indicate a request to close the pressure relief valve;

[0030] The step of adjusting the current fuel tank state according to the state control information to obtain the fuel tank working state includes:

[0031] In response to the current fuel tank state being an underpressure state and the state control information indicating that the pressure is higher than a fourth threshold, the current fuel tank state is adjusted to a balanced state.

[0032] In a second aspect, an embodiment of the present application provides a system, including:

[0033] An information acquisition unit, used to acquire current fuel tank status and status control information, wherein the status control information includes request information or status information for triggering fuel tank status adjustment;

[0034] A fuel tank working state determining unit, configured to adjust the current fuel tank state according to the state control information to obtain the fuel tank working state;

[0035] The pressure relief valve control unit is used to control the pressure relief valve to open or close according to the working state of the oil tank.

[0036] In a third aspect, an embodiment of the present application provides a device, comprising a memory and a processor, wherein the memory is used to store instructions or codes, and the processor is used to execute the instructions or codes so that the device executes the pressure relief valve control method described in any one of the first aspects above.

[0037] In a fourth aspect, an embodiment of the present application provides a computer storage medium, in which a code is stored. When the code is executed, a device executing the code implements the pressure relief valve control method described in any one of the first aspects above.

[0038] In a fifth aspect, an embodiment of the present application provides a vehicle, wherein the vehicle includes a central electronic control module, and the central electronic control module is used to execute the pressure relief valve control method described in any one of the first aspects.

[0039] Compared with the prior art, this application has the following beneficial effects:

[0040] The pressure relief valve control method, system, vehicle and medium provided in the present application obtain the current fuel tank state and state control information, adjust the current fuel tank state according to the state control information, and obtain the working state of the fuel tank; control the opening or closing of the pressure relief valve according to the working state of the fuel tank, and set multiple working states for the high-pressure fuel tank, including five working states: refueling state, diagnostic state, balance state, high-pressure state, and under-pressure state. On this basis, set state switching, adjust the current fuel tank state according to the state control information, and set different high-pressure fuel tank pressure relief valve management strategies for each working state. The pressure, fuel tank liquid level and carbon canister concentration are comprehensively considered to control the pressure relief valve so that the pressure of the high-pressure fuel tank is maintained within a reasonable range. In this way, the effect of flexibly controlling the opening and closing of the pressure relief valve is achieved, and the risk of saturated carbon canister overflow is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in this embodiment or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0042] Figure 1 A schematic diagram of the structure of the controlled object provided in the embodiment of the present application;

[0043] Figure 2 A flow chart of a pressure relief valve control method provided in an embodiment of the present application;

[0044] Figure 3 A conversion diagram of multiple working states provided for an embodiment of the present application;

[0045] Figure 4 A functional architecture diagram of a diagnostic system for a high-pressure tank pressure relief valve request provided in an embodiment of the application;

[0046] Figure 5 is a logic diagram for calculating the first threshold;

[0047] Figure 6 is a logic diagram for calculating the second threshold;

[0048] Figure 7 A structural diagram of a pressure relief valve control system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0049] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0050] As mentioned above, with the continuous advancement of the dual carbon goals and the increasing pressure on energy security, my country has vigorously developed new energy vehicles, the three-electric technology has been continuously improved, and the production and sales volume has continued to increase. However, pure electric and fuel cell vehicles still have many shortcomings, such as the low energy density and deformation safety of lithium batteries, the cost control of fuel cells and the storage and preparation of hydrogen, which seriously restrict their development and application. Plug-in hybrid vehicles, with their energy saving, environmental protection and long endurance, combined with the comprehensive advantages of traditional gasoline engines and electric vehicles, have gradually been favored by the market and manufacturers. With the continuous decline in the cost of three-electric vehicles and the continuous maturity of three-electric control technology, the relevant core technologies of hybrid vehicles have become the main work of competition among major OEMs at this stage. China's sixth-stage emission regulations for light vehicles have been implemented, among which the regulatory limit for the first category of vehicles in the IV evaporative emission test is 0.7g / test, which poses a great challenge to vehicle development. Although plug-in hybrid vehicles have the advantages of energy saving and environmental protection, the carbon tube flushing opportunities are reduced under pure electric driving, which easily leads to the risk of carbon tube oil and gas concentration saturation and leakage into the atmosphere. Therefore, the mainstream solution of the plug-in hybrid vehicle fuel evaporation system uses a high-pressure fuel tank and is equipped with an isolation valve. When the engine is not working, the oil and gas are isolated in the high-pressure fuel tank, and the volatilization is suppressed by the high bootstrap pressure (the pressure generated by the evaporation of liquid in a closed space). In the actual application process, on the one hand, it is necessary to consider that the pressure of the high-pressure fuel tank cannot be too large to prevent the high-pressure fuel tank from being damaged by high pressure. This requires that the isolation valve be opened as frequently as possible to keep the pressure of the high-pressure fuel tank low. On the other hand, considering the current saturation of the carbon canister and the amount of oil vapor in the tank, frequent pressure relief will cause the carbon canister to be filled, and the temperature drops at night after parking, and the oil vapor liquefaction characteristic cannot be effectively utilized. In the current vehicle application process, the engine needs to judge by itself when the tank pressure exceeds a certain limit. In order to protect the safety of the high-pressure tank, the tank isolation valve must be controlled to open for pressure relief.

[0051] In view of this, it can be known from the characteristics of vehicle applications that the pressure of the high-pressure fuel tank of the vehicle cannot be maintained in a low state. The present application provides a pressure relief valve control method, system, vehicle and medium. It aims to obtain the current fuel tank state and state control information, adjust the current fuel tank state according to the state control information, and obtain the working state of the fuel tank; control the opening or closing of the pressure relief valve according to the working state of the fuel tank, and set multiple working states for the high-pressure fuel tank, including five working states: refueling state, diagnostic state, balance state, high pressure state, and underpressure state. On this basis, a state jump strategy is designed to comprehensively consider the pressure, fuel tank level and carbon canister concentration to control the pressure relief valve so that the pressure of the high-pressure fuel tank is maintained within a reasonable range. And it can reasonably jump the high-pressure fuel tank state based on the request of other controllers and other EMS internal modules of the vehicle. Therefore, the current fuel tank state is adjusted according to the state control information, and different high-pressure fuel tank pressure relief valve management strategies are set for each working state. The pressure, fuel tank level and carbon canister concentration are comprehensively considered to control the pressure relief valve so that the pressure of the high-pressure fuel tank is maintained within a reasonable range. As a result, the effect of flexibly controlling the opening and closing of the pressure relief valve is achieved, the risk of saturated carbon canister overflow is solved, and the oil and gas storage capacity of the high-pressure fuel tank is maximized to save fuel.

[0052] The method provided in the embodiment of the present application is executed by a pressure relief valve controller, and the controller can control a controlled object, which can be a high-pressure fuel tank fuel evaporation system structure, see Figure 1 , Figure 1 A schematic diagram of the structure of the controlled object provided in the embodiment of the present application, wherein the key components in the figure may include an engine electronic control module ECM101, a high-pressure fuel tank 103, a fuel tank pressure sensor 104, a fuel tank filling port 105, a high-pressure fuel tank pressure relief valve or a high-pressure fuel tank isolation valve 106, a carbon tube 107, a carbon tube flushing valve 109, an engine 110 and a vehicle CAN network 102, wherein the solid line connection part represents the actual pipeline, and the dotted line part represents the control signal.

[0053] The following is an example of an embodiment to illustrate a pressure relief valve control method provided by the present application. Figure 2 , Figure 2 This is a flow chart of a pressure relief valve control method provided in an embodiment of the present application. The control method provided in this embodiment can be executed by a controller, including:

[0054] S101. Obtain current fuel tank status and status control information.

[0055] For the fuel tank status management described in this patent, five working states are defined: refueling state, diagnostic state, balance state, high pressure state, and underpressure state. The various state conversion relationships are as follows: Figure 3 As shown, Figure 3A transition diagram of multiple working states provided in an embodiment of the present application, wherein the state control information is request information or state information for triggering fuel tank state adjustment, wherein the request information includes a diagnosis request and a refueling request, and wherein the state information includes pressure information in the fuel tank and refueling completion information.

[0056] S102: Adjust the current fuel tank state according to the state control information to obtain the fuel tank working state.

[0057] In a possible implementation, the adjusting the current fuel tank state according to the state control information to obtain the fuel tank working state includes the following situations:

[0058] The first type is that the fuel tank working state includes a diagnostic state, and the diagnostic state is used to indicate calling the on-board diagnostic system to control the pressure relief valve to be opened or closed. In response to the current fuel tank state being a balanced state and the state control information being a diagnostic request or a refueling request, the current fuel tank state is adjusted to obtain the fuel tank working state being a diagnostic state.

[0059] The conversion process can be found in Figure 3 When the high-pressure oil tank is currently in a balanced state, upon receiving a signal indicating that there is currently a diagnosis request or a refueling request, the balanced state is adjusted to a diagnosis state.

[0060] In actual application scenarios, when the engine controller determines that it needs to perform a reasonable diagnosis on the high-pressure fuel tank sensor and isolation valve, it needs to control the opening of the isolation valve for diagnosis, so that the high-pressure fuel tank is forced to release pressure. The diagnostic status is delivered to the diagnostic system for subsequent control. For the process of adjusting the fuel tank status to the diagnostic status, please refer to Figure 4 , Figure 4 The functional architecture diagram of the diagnostic system provided in this embodiment for the high-pressure fuel tank pressure relief valve request. Among them, the controller controls the OBD diagnostic module (OnBoard Diagnostic, on-board diagnostic system) to send a diagnostic request to the high-pressure fuel tank control module, adjust the working state of the fuel tank to the diagnostic state, and in actual application scenarios, according to the diagnostic results of the vehicle fuel tank or other components by the on-board diagnostic system OBD, the judgment result and valve control instruction are obtained, that is, the pressure relief valve is controlled to open or the pressure relief valve is controlled to close, and then the on-board diagnostic system sends one of the valve closing request and the opening request to the high-pressure fuel tank control module or controller inside the EMS (Engine Management System, engine management system).

[0061] The second type is that the fuel tank working state includes a refueling state, and the refueling state is used to indicate a request to open the pressure relief valve. In response to the current fuel tank state being a diagnostic state or a high pressure state and the state control information being a refueling request, the current fuel tank state is adjusted to a refueling state.

[0062] The conversion process can be found in Figure 3 When the current fuel tank status is in the diagnostic status or high pressure status, a refueling request is received and the diagnostic status or high pressure status is adjusted to the refueling status. That is, the current working status of the fuel tank is the refueling status, and the subsequent control of the pressure relief valve is determined according to the working status of the fuel tank. The refueling status is used to indicate the request to open the pressure relief valve. The refueling request and refueling completion information come from the judgment of the BCM (Body Control Module).

[0063] The third type is that the fuel tank working state includes a balanced state, and the balanced state is used to indicate a request to close the pressure relief valve; in response to the current fuel tank state being a refueling state and the state control information being refueling completion information, the current fuel tank state is adjusted to a balanced state.

[0064] The conversion process can be found in Figure 3 When the current fuel tank state is the refueling state, the controller obtains the state control information as the refueling completion information, and adjusts the current fuel tank state to obtain the current fuel tank working state balance state. In actual application scenarios, the refueling request and refueling completion information are sent by the BCM (body control module) to the ECM (engine electronic control module). The system detects the occurrence of the above-mentioned refueling request or refueling completion information and triggers the current state adjustment process.

[0065] Fourth, the fuel tank working state includes a high-pressure state, and the high-pressure state is used to indicate a request to open the pressure relief valve; in response to the current fuel tank state being a balanced state and the state control information being a pressure higher than a first threshold, the current fuel tank state is adjusted to a high-pressure state, and the first threshold is a high-pressure relief pressure value determined according to the carbon canister concentration, the tank liquid level and the road roughness.

[0066] See also Figure 5 , Figure 5 The calculation logic of the first threshold value is to obtain the initial high-pressure relief pressure by looking up the table according to the carbon canister concentration and the tank level, and then obtain the current road roughness, and correct the above-obtained initial high-pressure relief pressure according to the road roughness to obtain the real high-pressure relief pressure value ph1 (first threshold value). In theory, the higher the carbon canister concentration, the smaller the carbon canister capacity, and the high-pressure tank should maintain a higher pressure to allow the carbon canister concentration to drop before opening. Therefore, the greater the pressure found, the lower the tank level, which means more oil vapor, and the high-pressure tank must also maintain a higher pressure to allow the solenoid valve to open.

[0067] Fifth, the oil tank working state includes a balanced state, and the balanced state is used to indicate a request to close the pressure relief valve;

[0068] In response to the current fuel tank state being a high pressure state and the state control information being a pressure lower than a second threshold, the current fuel tank state is adjusted to a balanced state, and the second threshold is a stop pressure relief pressure value determined according to the carbon canister concentration, the fuel tank liquid level and the road roughness.

[0069] See also Figure 6 , Figure 6 This is a logic diagram for calculating the second threshold value. A stop pressure relief pressure is obtained by looking up the table based on the carbon canister and the fuel tank liquid level. After being corrected by the road roughness correction table, the high pressure relief pressure ph2 (the second threshold value) is obtained.

[0070] Sixth, the fuel tank working state includes an underpressure state, and the underpressure state is used to indicate a request to open the pressure relief valve; in response to the current fuel tank state being a balanced state and the state control information being that the pressure is lower than a third threshold, the current fuel tank state is adjusted to an underpressure state.

[0071] When it is determined that the current fuel tank is in a balanced state, the state control information is obtained as pressure information, and the pressure is lower than the third threshold, which means that the current fuel tank needs to open the pressure relief valve, and adjust the current fuel tank state to an underpressure state. Subsequently, a corresponding pressure relief valve control instruction is generated according to the underpressure state to open the pressure relief valve.

[0072] Seventh, the fuel tank working state includes a balanced state, and the balanced state is used to indicate a request to close the pressure relief valve; in response to the current fuel tank state being an underpressure state and the state control information being that the pressure is higher than a fourth threshold value, the current fuel tank state is adjusted to a balanced state.

[0073] for Figure 3 The underpressure conditions kl1 and kl2 can be calibrated with a single value, that is, the third threshold and the fourth threshold can be set according to the actual situation of the fuel tank and the carbon canister, and the values ​​can be flexibly adjusted according to the actual situation.

[0074] S103, controlling the pressure relief valve to open or close according to the working state of the oil tank.

[0075] According to the pressure relief valve control strategy corresponding to each working state in the above steps, the opening or closing of the pressure relief valve is controlled, and the balanced state is used to indicate a request to close the pressure relief valve; the underpressure state is used to indicate a request to open the pressure relief valve, the balanced state is used to indicate a request to close the pressure relief valve, the high pressure state is used to indicate a request to open the pressure relief valve, and the diagnostic state is used to indicate calling the on-board diagnostic system to control the opening or closing of the pressure relief valve. In actual application scenarios, the first is that the vehicle CAN network sends the vehicle refueling request to the engine controller. In response to the controller judging that the engine has received the refueling request, the controller controls the high-pressure tank pressure relief valve to open for pressure relief; the second is that when the controller judges that the current tank pressure exceeds a certain limit, in order to protect the safety of the high-pressure tank body, the tank isolation valve is controlled to open for pressure relief; the third is that when the engine controller judges that it is necessary to perform a reasonable diagnosis on the high-pressure tank sensor and the isolation valve, it is necessary to control the opening of the isolation valve for diagnosis, so that the high-pressure tank is forced to release pressure.

[0076] According to the working state of the oil tank adjusted in the above steps, a corresponding pressure relief valve control strategy is generated, and the pressure relief valve control strategy is used to control the opening or closing of the pressure relief valve.

[0077] The pressure relief valve control method provided in the embodiment of the present application obtains the current fuel tank state and state control information, adjusts the current fuel tank state according to the state control information, and obtains the working state of the fuel tank; controls the opening or closing of the pressure relief valve according to the working state of the fuel tank, sets multiple working states for the high-pressure fuel tank, sets state switching based on several working states, adjusts the current fuel tank state according to the state control information, and sets different high-pressure fuel tank pressure relief valve management strategies for each working state. The pressure, fuel tank liquid level and carbon canister concentration are comprehensively considered to control the pressure relief valve so that the pressure of the high-pressure fuel tank is maintained within a reasonable range. In this way, the risk of carbon canister saturation and overflow is solved.

[0078] The above are some specific implementations of the pressure relief valve control method provided in the embodiment of the present application. Based on this, the present application also provides a corresponding system for pressure relief valve control. The system provided in the embodiment of the present application will be introduced from the perspective of functional modularization. Figure 7 A structural diagram of a pressure relief valve control system provided in an embodiment of the present application.

[0079] The embodiment of the present application also provides a pressure relief valve control system, including:

[0080] An information acquisition unit 201 is used to acquire current fuel tank status and status control information, wherein the status control information includes request information or status information for triggering fuel tank status adjustment;

[0081] A fuel tank working state determining unit 202, configured to adjust the current fuel tank state according to the state control information to obtain the fuel tank working state;

[0082] The pressure relief valve control unit 203 is used to control the pressure relief valve to open or close according to the working state of the fuel tank.

[0083] An embodiment of the present application provides a device, which includes a memory and a processor, wherein the memory is used to store instructions or codes, and the processor is used to execute the instructions or codes so that the device executes any of the pressure relief valve control methods described above.

[0084] An embodiment of the present application provides a computer storage medium, in which codes are stored. When the codes are executed, a device executing the codes implements any of the aforementioned pressure relief valve control methods.

[0085] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referred to each other. For the system or device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part description.

[0086] It should be understood that in the present application, "at least one (item)" means one or more, and "plurality" means two or more. "And / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally indicates that the objects associated before and after are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.

[0087] It should also be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0088] The steps of the method or algorithm described in conjunction with the embodiments disclosed herein may be implemented directly using hardware, a software module executed by a processor, or a combination of the two. The software module may be placed in a random access memory (RAM), a memory, a read-only memory (ROM), an electrically programmable ROM, an electrically erasable programmable ROM, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0089] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A pressure relief valve control method, characterized in that: include: Acquire current fuel tank status and status control information, wherein the status control information includes request information or status information for triggering fuel tank status adjustment; Adjust the current fuel tank state according to the state control information to obtain the fuel tank working state; Controlling the pressure relief valve to open or close according to the pressure relief valve control strategy corresponding to the working state of the fuel tank, wherein the pressure relief valve control strategy is a strategy for controlling the pressure relief valve set for each working state of the fuel tank; The fuel tank working state includes a high-pressure state, and the high-pressure state is used to indicate a request to open the pressure relief valve; the adjusting the current fuel tank state according to the state control information to obtain the fuel tank working state includes: In response to the current fuel tank state being a balanced state and the state control information being a pressure higher than a first threshold, adjusting the current fuel tank state to a high pressure state, wherein the first threshold is a high pressure relief pressure value determined according to a carbon canister concentration, a fuel tank liquid level, and a road surface roughness; The working state of the fuel tank includes a balanced state, and the balanced state is used to indicate a request to close the pressure relief valve; the adjusting the current fuel tank state according to the state control information to obtain the working state of the fuel tank includes: In response to the current fuel tank state being an underpressure state and the state control information indicating that the pressure is higher than a fourth threshold, adjusting the current fuel tank state to a balanced state; The method for determining the first threshold includes: According to the carbon canister concentration and the fuel tank liquid level, the high-pressure relief two-dimensional table is queried to obtain the initial high-pressure relief pressure; The initial high-pressure relief pressure is corrected according to the road surface roughness and the road surface roughness correction table to obtain a first threshold value.

2. The method according to claim 1, characterized in that The fuel tank working state includes a diagnostic state, and the diagnostic state is used to indicate calling the on-board diagnostic system to control the pressure relief valve to be opened or closed; The step of adjusting the current fuel tank state according to the state control information to obtain the fuel tank working state includes: In response to the current fuel tank state being a balanced state and the state control information being a diagnosis request or a refueling request, the current fuel tank state is adjusted to a diagnosis state.

3. The method according to claim 1, characterized in that The fuel tank working state includes a refueling state, and the refueling state is used to indicate a request to open the pressure relief valve; The step of adjusting the current fuel tank state according to the state control information to obtain the fuel tank working state includes: In response to the current fuel tank state being a diagnostic state, a high pressure state or an under pressure state, and the state control information being a refueling request, the current fuel tank state is adjusted to a refueling state.

4. The method according to claim 1, characterized in that: The oil tank working state includes a balance state, and the balance state is used to indicate a request to close the pressure relief valve; The step of adjusting the current fuel tank state according to the state control information to obtain the fuel tank working state includes: In response to the current fuel tank state being a refueling state and the state control information being refueling completion information, the current fuel tank state is adjusted to a balanced state.

5. The method according to claim 1, characterized in that The oil tank working state includes a balance state, and the balance state is used to indicate a request to close the pressure relief valve; The step of adjusting the current fuel tank state according to the state control information to obtain the fuel tank working state includes: In response to the current fuel tank state being a high pressure state and the state control information being a pressure lower than a second threshold, the current fuel tank state is adjusted to a balanced state, and the second threshold is a stop pressure relief pressure value determined according to the carbon canister concentration, the fuel tank liquid level and the road roughness.

6. The method according to claim 1, characterized in that The oil tank working state includes an underpressure state, and the underpressure state is used to indicate a request to open the pressure relief valve; The step of adjusting the current fuel tank state according to the state control information to obtain the fuel tank working state includes: In response to the current fuel tank state being a balanced state and the state control information indicating that the pressure is lower than a third threshold, the current fuel tank state is adjusted to an underpressure state.

7. A pressure relief valve control system, characterized in that: include: An information acquisition unit, used to acquire current fuel tank status and status control information, wherein the status control information includes request information or status information for triggering fuel tank status adjustment; A fuel tank working state determining unit, configured to adjust the current fuel tank state according to the state control information to obtain the fuel tank working state; A pressure relief valve control unit, used to control the pressure relief valve to open or close according to a pressure relief valve control strategy corresponding to the working state of the fuel tank, wherein the pressure relief valve control strategy is a strategy set for each working state of the fuel tank and is used to control the pressure relief valve; The fuel tank working state includes a high-pressure state, and the high-pressure state is used to indicate a request to open the pressure relief valve; the adjusting the current fuel tank state according to the state control information to obtain the fuel tank working state includes: In response to the current fuel tank state being a balanced state and the state control information being a pressure higher than a first threshold, adjusting the current fuel tank state to a high pressure state, wherein the first threshold is a high pressure relief pressure value determined according to a carbon canister concentration, a fuel tank liquid level, and a road surface roughness; The working state of the fuel tank includes a balanced state, and the balanced state is used to indicate a request to close the pressure relief valve; the adjusting the current fuel tank state according to the state control information to obtain the working state of the fuel tank includes: In response to the current fuel tank state being an underpressure state and the state control information indicating that the pressure is higher than a fourth threshold, adjusting the current fuel tank state to a balanced state; The method for determining the first threshold includes: According to the carbon canister concentration and the fuel tank liquid level, the high-pressure relief two-dimensional table is queried to obtain the initial high-pressure relief pressure; The initial high-pressure relief pressure is corrected according to the road surface roughness and the road surface roughness correction table to obtain a first threshold value.

8. A vehicle, characterized in that: The vehicle includes a central electronic control module, and the central electronic control module is used to execute the pressure relief valve control method described in any one of claims 1-6.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores instructions, and when the instructions are executed on a terminal device, the terminal device executes the pressure relief valve control method according to any one of claims 1 to 6.

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