Fuel steam desorption control method, device, controller, system and vehicle

Abstract

The invention relates to the technical field of vehicles, in particular to a fuel steam desorption control method, device, controller and system and a vehicle. The method comprises the steps that the fuel type and the fuel tank pressure in the vehicle running process are recognized; determining a target desorption instruction of the fuel tank according to the fuel type and the fuel tank pressure; and controlling the fuel steam desorption action of the oil tank according to the target desorption instruction. Therefore, the problems that in the prior art, when a CNG fuel automobile is used, fuel oil saturated vapor pressure is easily reduced, and the performance of an engine is affected when the engine is started by using fuel oil at low temperature are solved.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, and in particular to a control method, apparatus, controller, system, and vehicle for fuel vapor desorption. Background Technology

[0002] Most CNG (Compressed Natural Gas) fuel vehicles are modified from gasoline vehicles. Their fuel evaporation control systems have basically retained the original design, including some components and carbon canister desorption control strategies that meet China VI emission standards, but have eliminated fuel evaporation system leak diagnosis.

[0003] Because CNG fuel vehicles (including dual-fuel vehicles and single-fuel vehicles, the latter with a fuel tank capacity of no more than 15L) mainly use CNG fuel, and are only forced to use gasoline when starting at low temperatures (such as when the water temperature is below 0°C), when there is a shortage of fuel, or when the CNG fuel system malfunctions, users refuel less frequently. When the engine is running on CNG fuel, this system design causes the fuel vapors to continuously desorb for a long time. The continuous desorption of carbon canister by the intake manifold causes negative pressure to be generated in the fuel tank due to the sealing effect of the fuel tank cap, resulting in a decrease in the saturated vapor pressure of the fuel, which in turn affects the engine performance when starting on gasoline at low temperatures. Summary of the Invention

[0004] This application provides a method, apparatus, controller, system, and vehicle for controlling fuel vapor desorption, in order to solve the problems in the related art where the use of CNG fuel vehicles easily causes a drop in fuel saturated vapor pressure, affecting the engine performance when starting with fuel at low temperatures.

[0005] The first aspect of this application provides a fuel vapor desorption control method, comprising the following steps: identifying the fuel type and fuel tank pressure during vehicle operation; determining a target desorption command for the fuel tank based on the fuel type and fuel tank pressure; and controlling the fuel vapor desorption action of the fuel tank according to the target desorption command.

[0006] Optionally, the fuel type includes liquid fuel and gaseous fuel. The target desorption command for the fuel tank is determined based on the fuel type and the tank pressure, including: if the fuel type is liquid fuel, the target desorption command is a desorption start command; if the fuel type is gaseous fuel, the target desorption command for the fuel tank is determined based on the tank pressure.

[0007] Optionally, the target desorption command for the oil tank is determined based on the oil tank pressure, including: if the oil tank pressure is greater than the opening threshold, the target desorption command is a desorption opening command; if the oil tank pressure is less than the closing threshold, the target desorption command is a desorption closing command.

[0008] Optionally, the fuel vapor desorption operation of the fuel tank is controlled according to the target desorption command, including: if the target desorption command is a desorption start command, then the fuel vapor desorption of the fuel tank is started; if the target desorption command is a desorption stop command, then the fuel vapor desorption of the fuel tank is stopped.

[0009] Optionally, the process of stopping fuel vapor desorption from the fuel tank also includes: identifying the on / off state of the pipeline between the carbon canister and the fuel tank; if the on / off state is a conducting state, then disconnecting the pipeline between the carbon canister and the fuel tank.

[0010] Optionally, after controlling the fuel vapor desorption action of the fuel tank according to the target desorption command, the method further includes: identifying the on / off state of the pipeline between the carbon canister and the fuel tank; if the on / off state is off, then connecting the pipeline between the carbon canister and the fuel tank.

[0011] A second aspect of this application provides a control device for fuel vapor desorption, comprising: an identification module for identifying the fuel type and fuel tank pressure during vehicle operation; a determination module for determining a target desorption command for the fuel tank based on the fuel type and fuel tank pressure; and a control module for controlling the fuel vapor desorption action of the fuel tank according to the target desorption command.

[0012] A third aspect of this application provides a controller, including: a memory, a processor, and a computer program stored in the memory and executable on the processor. The processor executes the program to implement the fuel vapor desorption control method as described in the above embodiments.

[0013] A third aspect of this application provides a control system for fuel vapor desorption, comprising: an engine, a fuel tank, and a carbon canister; a pressure sensor disposed at a target location in the fuel tank; a first switch disposed on a pipeline between the engine and the carbon canister; a second switch disposed on a pipeline between the fuel tank and the carbon canister; and a control module thereof, wherein the control module is connected to the pressure sensor, the first switch, and the second switch respectively.

[0014] The fourth aspect of this application provides a vehicle including a fuel vapor desorption control system as described in the third aspect.

[0015] Therefore, this application has the following beneficial effects:

[0016] This application's embodiments identify the fuel type and fuel tank pressure during vehicle operation, determine the target desorption command for the fuel tank based on the fuel type and fuel tank pressure, and then control the fuel vapor desorption action of the fuel tank according to the target desorption command. This ensures that when the engine is using CNG, the saturated vapor pressure of the fuel in the fuel tank will not drop rapidly due to desorption, thus guaranteeing the engine's performance when starting on fuel at low temperatures. Simultaneously, it prevents fuel vapor from escaping into the atmosphere through the fuel tank cap and causing environmental pollution. Therefore, it solves the problems in related technologies where CNG fuel vehicles easily cause a drop in fuel saturated vapor pressure, affecting engine performance when starting on fuel at low temperatures.

[0017] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0019] Figure 1 This is a schematic flowchart of a control method for fuel vapor desorption according to an embodiment of this application;

[0020] Figure 2 This is a schematic diagram of a fuel evaporation control system according to an embodiment of this application;

[0021] Figure 3 This is a schematic flowchart of a fuel evaporation control method according to an embodiment of this application;

[0022] Figure 4 This is a block diagram of a control device for fuel vapor desorption provided according to an embodiment of this application;

[0023] Figure 5 This is a schematic diagram of the controller provided according to an embodiment of this application;

[0024] Figure 6 This is a structural example diagram of a control system for fuel vapor desorption provided according to an embodiment of this application. Detailed Implementation

[0025] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0026] The following description, with reference to the accompanying drawings, outlines a fuel vapor desorption control method, apparatus, controller, system, and vehicle according to embodiments of this application. Addressing the issues mentioned in the background art, such as prolonged and continuous desorption of fuel vapor from CNG fuel systems, leading to a decrease in fuel saturated vapor pressure, starting difficulties during cold starts, and potential fuel vapor escape from the fuel tank cap into the atmosphere, causing environmental pollution, this application provides a fuel vapor desorption control method. This method identifies the fuel type and fuel tank pressure during vehicle operation, determines a target desorption command for the fuel tank based on these parameters, and then controls the fuel vapor desorption action according to the target desorption command. This ensures that when the engine is operating with CNG, the fuel saturated vapor pressure in the fuel tank does not rapidly decrease due to desorption, while simultaneously preventing fuel vapor from escaping into the atmosphere through the fuel tank cap and causing environmental pollution, and without increasing fuel consumption. Therefore, this solves the problems of fuel vapor escaping from the fuel tank cap into the atmosphere, causing environmental pollution and increased fuel consumption, that arise when addressing fuel desorption in related technologies.

[0027] Specifically, Figure 1 This is a schematic flowchart of a fuel vapor desorption control method provided in an embodiment of this application.

[0028] like Figure 1 As shown, the control method for fuel vapor desorption includes the following steps:

[0029] In step S101, the fuel type and fuel tank pressure during vehicle operation are identified.

[0030] The fuel types include liquid fuels and gaseous fuels. Liquid fuels generally include petroleum products such as gasoline and diesel fuel, but in this embodiment, they specifically refer to gasoline fuel. Gaseous fuels mainly refer to CNG, LNG (Liquefied Natural Gas), and LPG (Liquefied Petroleum Gas). The fuel type during vehicle operation can be identified by recognizing the status of the fuel switch. The specific identification method is set according to the actual situation and is not specifically limited here. The fuel tank pressure can be identified by a fuel tank pressure sensor.

[0031] In step S102, the target desorption command for the fuel tank is determined based on the fuel type and tank pressure.

[0032] The target desorption command includes a desorption start command and a desorption stop command, which are used to adjust and control fuel vapor desorption.

[0033] It is understood that the embodiments of this application determine the target desorption command of the fuel tank based on the fuel type and the fuel tank pressure, and adjust the fuel vapor desorption according to different fuel types and fuel tank pressures, thereby realizing the dynamic adjustment of the desorption process according to the actual operating conditions.

[0034] In this embodiment of the application, determining the target desorption command of the fuel tank based on the fuel type and the fuel tank pressure includes: if the fuel type is liquid fuel, the target desorption command is a desorption start command; if the fuel type is gaseous fuel, the target desorption command of the fuel tank is determined based on the fuel tank pressure.

[0035] It is understood that in this embodiment of the application, when it is detected that the vehicle is using liquid fuel, the target desorption command is defaulted to the desorption start command, regardless of the fuel tank pressure, that is, the desorption operation is performed according to the normal strategy to ensure the normal operation of the fuel system; if the fuel type is gaseous fuel, the target desorption command needs to be further determined according to the fuel tank pressure, which will be described in detail below.

[0036] In this embodiment of the application, determining the target desorption command of the oil tank based on the oil tank pressure includes: if the oil tank pressure is greater than the opening threshold, the target desorption command is a desorption opening command; if the oil tank pressure is less than the closing threshold, the target desorption command is a desorption closing command.

[0037] The enable and disable thresholds are set through calibration.

[0038] It is understood that in this embodiment of the application, when the fuel tank pressure sensor detects that the pressure inside the fuel tank is greater than the set opening threshold, it indicates that the fuel tank pressure is too high and issues a desorption opening command to reduce the pressure inside the fuel tank; when the fuel tank pressure drops below the set closing threshold, it indicates that the fuel tank pressure has returned to normal level. In order to prevent excessive desorption from affecting fuel performance or causing environmental pollution, a desorption closing command is issued to stop the desorption operation. This realizes dynamic adjustment of the desorption operation according to the change of fuel tank pressure, ensuring the safety and environmental protection of the system.

[0039] In step S103, the fuel vapor desorption action of the oil tank is controlled according to the target desorption command.

[0040] Among them, the fuel vapor desorption action refers to the opening and closing of the pipeline between the carbon canister and the fuel tank to regulate the pressure balance inside and outside the fuel tank, prevent problems caused by excessively high or low pressure inside the fuel tank, and reduce environmental pollution caused by the direct emission of fuel vapor into the atmosphere.

[0041] In this embodiment of the application, controlling the fuel vapor desorption action of the fuel tank according to the target desorption command includes: if the target desorption command is a desorption start command, then start the fuel vapor desorption of the fuel tank; if the target desorption command is a desorption stop command, then stop the fuel vapor desorption of the fuel tank.

[0042] It is understood that the embodiments of this application control the fuel vapor desorption action of the fuel tank according to the target desorption command. If the received target desorption command is a desorption start command, the fuel vapor desorption of the fuel tank is started; if the received target desorption command is a desorption stop command, the fuel vapor desorption of the fuel tank is stopped, thereby accurately managing the fuel vapor desorption action of the fuel tank and maintaining the safety and environmental performance of the system.

[0043] In this embodiment of the application, the process of stopping the desorption of fuel vapor from the fuel tank further includes: identifying the on / off state of the pipeline between the carbon canister and the fuel tank; if the on / off state is a conducting state, then disconnecting the pipeline between the carbon canister and the fuel tank.

[0044] The carbon canister is an important component of the automotive fuel evaporative emission control system. Its main function is to capture and store fuel vapors generated by the evaporation of gasoline in the fuel tank, so as to prevent these vapors from being directly emitted into the atmosphere and causing environmental pollution. The carbon canister is filled with activated carbon particles, which have a strong adsorption capacity and can effectively adsorb hydrocarbons in fuel vapors, preventing them from being directly emitted into the atmosphere.

[0045] It is understood that, in this embodiment of the application, when it is necessary to stop the desorption operation of fuel vapor in the fuel tank, the current on / off state of the pipeline between the carbon canister and the fuel tank is identified. If it is detected that the pipeline between the carbon canister and the fuel tank is in a conductive state, it means that there is still a path for fuel vapor to flow from the fuel tank to the carbon canister. In order to completely stop the desorption and ensure the pressure in the fuel tank is stable, it is necessary to disconnect the pipeline connection between the carbon canister and the fuel tank, effectively avoid unnecessary fuel vapor flow, ensure the system's sealing, and reduce the risk of environmental pollution.

[0046] In this embodiment of the application, after controlling the fuel vapor desorption action of the fuel tank according to the target desorption command, the method further includes: identifying the on / off state of the pipeline between the carbon canister and the fuel tank; if the on / off state is off, then connecting the pipeline between the carbon canister and the fuel tank.

[0047] It is understood that after controlling the fuel vapor desorption action of the fuel tank according to the target desorption command, the embodiments of this application will further identify the on / off status of the pipeline between the carbon canister and the fuel tank. If it is found that the pipeline is currently in an open state, it means that there is no direct connection path between the carbon canister and the fuel tank. Then, the pipeline between the carbon canister and the fuel tank will be opened to ensure that the fuel vapor can flow smoothly from the fuel tank to the carbon canister for processing. At the same time, it will prepare for the subsequent desorption process and ensure the effectiveness and reliability of the entire fuel evaporation control system.

[0048] The fuel vapor desorption control method proposed in this application identifies the fuel type and fuel tank pressure during vehicle operation, determines the target desorption command for the fuel tank based on the fuel type and fuel tank pressure, and then controls the fuel vapor desorption action of the fuel tank according to the target desorption command. This ensures that when the engine is using CNG, the saturated vapor pressure of the fuel in the tank will not drop rapidly due to desorption, thus guaranteeing the engine's performance when starting with fuel at low temperatures. Simultaneously, it prevents fuel vapor from escaping into the atmosphere through the fuel tank cap and causing environmental pollution. Therefore, it solves the problems in related technologies where CNG fuel vehicles easily cause a drop in fuel saturated vapor pressure, affecting engine performance when starting with fuel at low temperatures.

[0049] The control method for fuel vapor desorption is further described below through a specific embodiment.

[0050] This embodiment relates to a fuel evaporation control system structure and related control strategies.

[0051] This embodiment includes a system consisting of an ECU (Engine Control Unit), a fuel switching switch, a carbon canister solenoid valve, a switching valve, a fuel tank pressure sensor, a fuel tank cap, and related piping, such as... Figure 2 As shown, the fuel tank cap is a sealed structure without a pressure relief valve. The fuel tank pressure sensor monitors the pressure inside the fuel tank. The engine control unit controls the operation of the switching valve and the carbon canister solenoid valve based on the fuel tank pressure signal and fuel type. Figure 2 In the diagram, the thickest solid line represents the fuel line, the next thickest solid line represents the fuel vapor line, and the thinnest solid line represents the signal or control wiring harness.

[0052] like Figure 3 The diagram shown is a schematic flowchart of the fuel evaporation control method provided in this embodiment, which includes the following steps:

[0053] Step S201: Determine whether the engine is started. If yes, proceed to step S202; if the engine is not started, proceed to step S211.

[0054] Step S202: Determine the fuel state. If the fuel is CNG, proceed to step S203; if the fuel is fuel oil, proceed to step S209.

[0055] Step S203: Determine if the oil tank pressure is greater than the opening threshold, such as 5 kPa. If it is greater, proceed to step S206; if it is less, proceed to step S204.

[0056] Step S204: Close the switch valve and proceed to step S205.

[0057] Step S205: The carbon canister solenoid valve stops desorption, and proceed to step S201.

[0058] Step S206: Open the switch valve and proceed to step S207.

[0059] Step S207: The carbon canister solenoid valve desorbs normally, proceed to step S208.

[0060] Step S208: Determine whether the oil tank pressure is less than the closing threshold, such as -1 kPa. If it is less, proceed to step S204; if it is greater, proceed to step S206.

[0061] Step S209: Open the switch valve and proceed to step S210.

[0062] Step S210: The carbon canister solenoid valve desorbs normally, proceed to step S201.

[0063] Step S211: Open the switch valve and proceed to step S201.

[0064] Specifically, the switching valve is a normally open valve, which is open by default when power is off. When the engine is running on fuel, such as gasoline, the switching valve is in the on state, and the carbon canister solenoid valve is opened under the control of the ECU, allowing the carbon canister to desorb normally. When the engine is running CNG, both the switching valve and the carbon canister solenoid valve are in the closed state. When the fuel tank pressure is too high (e.g., exceeding 5 kPa, which can be set through calibration), the switching valve opens, and the ECU controls the carbon canister solenoid valve to open, allowing the carbon canister to desorb normally. When the fuel tank pressure drops below -1 kPa (which can be set through calibration), the switching valve closes, the carbon canister solenoid valve closes, and carbon canister desorption stops. The operation of the carbon canister solenoid valve is controlled by the ECU according to the engine operating status.

[0065] The carbon canister solenoid valve is connected to the pipeline between the carbon canister assembly and the intake manifold, and is controlled by the ECU. The switching valve is connected to the pipeline between the carbon canister and the fuel tank vent. It is a normally open valve, and in the power-off state, it defaults to connecting the pipeline between the fuel tank and the carbon canister. That is, when the engine is off, the switching valve is open by default. After power is restored, it is controlled by the ECU. The fuel tank pressure sensor is installed below the upper end cover of the fuel pump assembly or at the fuel tank vent. It is used to monitor the pressure of the space above the fuel level in the fuel tank. This signal is input to the ECU. The fuel tank cap is a sealed fuel tank cap without a pressure relief valve. The fuel switch provides a fuel status signal, which can be either fuel status or CNG status. Its status can be switched manually or automatically according to the ECU strategy. The switch outputs the actual fuel status to the ECU.

[0066] In summary, the complete process of this embodiment is as follows: The ECU executes the actions of the canister purge solenoid valve and the switching valve based on the fuel status signal and the fuel tank pressure sensor signal. When the fuel is "fuel oil," the switching valve opens, the canister purge solenoid valve executes the normal ECU command, and the canister purge solenoid valve opens to desorb the carbon canister. When the fuel is CNG, the switching valve is closed by default. When the fuel tank pressure sensor signal indicates that the fuel tank pressure exceeds the opening threshold (e.g., 5 kPa, which can be set through calibration), the switching valve opens, the canister purge solenoid valve opens, and the carbon canister purge is desorbed. When the fuel tank pressure is lower than the closing threshold (e.g., -1 kPa, which can be set through calibration), the switching valve closes, the canister purge solenoid valve closes, and the carbon canister purge stops. When the engine is off, the switching valve is open by default.

[0067] Next, the control device for fuel vapor desorption according to an embodiment of this application is described with reference to the accompanying drawings.

[0068] Figure 4 This is a block diagram of a control device for fuel vapor desorption according to an embodiment of this application.

[0069] like Figure 4 As shown, the control device 10 for fuel vapor desorption includes: an identification module 301, a determination module 302, and a control module 303.

[0070] The identification module 301 is used to identify the fuel type and fuel tank pressure during vehicle operation; the determination module 302 is used to determine the target desorption command of the fuel tank based on the fuel type and fuel tank pressure; and the control module 303 is used to control the fuel vapor desorption action of the fuel tank based on the target desorption command.

[0071] In this embodiment of the application, the determining module 302 is further configured to: if the fuel type is liquid fuel, the target desorption command is a desorption start command; if the fuel type is gaseous fuel, the target desorption command of the fuel tank is determined according to the fuel tank pressure.

[0072] In this embodiment of the application, the determining module 302 is further configured to: determine the target desorption command of the oil tank based on the oil tank pressure, including: if the oil tank pressure is greater than the opening threshold, the target desorption command is a desorption opening command; if the oil tank pressure is less than the closing threshold, the target desorption command is a desorption closing command.

[0073] In this embodiment of the application, the control module 303 is further configured to: if the target desorption command is a desorption start command, then start the fuel vapor desorption of the fuel tank; if the target desorption command is a desorption stop command, then stop the fuel vapor desorption of the fuel tank.

[0074] In this embodiment of the application, the process of stopping the desorption of fuel vapor from the fuel tank further includes: identifying the on / off state of the pipeline between the carbon canister and the fuel tank; if the on / off state is a conducting state, then disconnecting the pipeline between the carbon canister and the fuel tank.

[0075] In this embodiment of the application, a connection module is also included, wherein the connection module is further configured to: after controlling the fuel vapor desorption action of the fuel tank according to the target desorption command, further include: identifying the on / off state of the pipeline between the carbon canister and the fuel tank; if the on / off state is the off state, then connect the pipeline between the carbon canister and the fuel tank.

[0076] It should be noted that the foregoing explanation of the control method embodiment for fuel vapor desorption also applies to the control device for fuel vapor desorption in this embodiment, and will not be repeated here.

[0077] The fuel vapor desorption control device proposed in this application identifies the fuel type and tank pressure during vehicle operation, determines the target desorption command for the tank based on the fuel type and tank pressure, and then controls the fuel vapor desorption action of the tank according to the target desorption command. This ensures that the saturated vapor pressure of the fuel in the tank does not drop rapidly due to desorption when the engine is using CNG, thus guaranteeing the engine's performance when starting with fuel at low temperatures. Simultaneously, it prevents fuel vapor from escaping into the atmosphere through the tank cap and causing environmental pollution. Therefore, it solves the problems in related technologies where CNG fuel vehicles easily experience a drop in fuel saturated vapor pressure, affecting engine performance when starting with fuel at low temperatures.

[0078] Figure 5 A schematic diagram of the controller provided in an embodiment of this application. The controller 20 may include:

[0079] The memory 401, the processor 402, and the computer program stored on the memory 401 and capable of running on the processor 402.

[0080] When the processor 402 executes the program, it implements the fuel vapor desorption control method provided in the above embodiments.

[0081] Furthermore, the controller 20 also includes:

[0082] Communication interface 403 is used for communication between memory 401 and processor 402.

[0083] The memory 401 is used to store computer programs that can run on the processor 402.

[0084] The memory 401 may include high-speed RAM (Random Access Memory) memory, and may also include non-volatile memory, such as at least one disk storage.

[0085] If the memory 401, processor 402, and communication interface 403 are implemented independently, then the communication interface 403, memory 401, and processor 402 can be interconnected via a bus to complete communication between them. The bus can be an ISA (Industry Standard Architecture) bus, a PCI (Peripheral Component Interconnect) bus, or an EISA (Extended Industry Standard Architecture) bus, etc. The bus can be divided into address bus, data bus, control bus, etc. For ease of representation, Figure 4 The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

[0086] Optionally, in a specific implementation, if the memory 401, processor 402, and communication interface 403 are integrated on a single chip, then the memory 401, processor 402, and communication interface 403 can communicate with each other through an internal interface.

[0087] Processor 402 may be a CPU (Central Processing Unit), an ASIC (Application Specific Integrated Circuit), or one or more integrated circuits configured to implement embodiments of this application.

[0088] This application also provides a control system for fuel vapor desorption, such as... Figure 6 As shown, it includes: an engine 501, a fuel tank 502, and a carbon canister 503; a pressure sensor 504 disposed at a target location in the fuel tank 502; a first switch 505 disposed on a pipeline between the engine 501 and the carbon canister 503; a second switch 506 disposed on a pipeline between the fuel tank 502 and the carbon canister 503; and the aforementioned controller 20, wherein the controller 20 is connected to the pressure sensor 504, the first switch 505, and the second switch 506 respectively.

[0089] The first switch 505 is a carbon canister solenoid valve, which is responsible for controlling the flow of fuel vapor from the carbon canister 503 to the intake manifold of the engine 501; the second switch 506 is mainly used to control whether the fuel vapor in the fuel tank 502 can flow to the carbon canister 503; the target position of the fuel tank 502 is set according to actual needs and is not specifically limited here.

[0090] It is understood that the embodiments of this application consist of an engine 501, a fuel tank 502, a carbon canister 503, and a series of control devices. A pressure sensor 504 is installed at a specific location in the fuel tank 502 to accurately measure pressure changes inside the fuel tank 502. A first switch 505 is located on the pipeline connecting the engine 501 and the carbon canister 503, used to control whether fuel vapor is allowed to pass between them. A second switch 506 is installed on the pipeline between the fuel tank 502 and the carbon canister 503, responsible for managing the passage status between them. The core is controlled by a controller 20, which is connected to the pressure sensor 504, the first switch 505, and the second switch 506. The controller 20 can determine the opening or closing of the first switch 505 and the second switch 506 based on the fuel tank pressure information provided by the pressure sensor 504, thereby effectively managing the fuel vapor desorption process and ensuring the system's safety and environmental performance.

[0091] The fuel vapor desorption control system proposed in this application identifies the fuel type and fuel tank pressure during vehicle operation, determines the target desorption command for the fuel tank based on the fuel type and fuel tank pressure, and then controls the fuel vapor desorption action of the fuel tank according to the target desorption command. This ensures that when the engine is operating with CNG, the saturated vapor pressure of the fuel in the fuel tank will not drop rapidly due to desorption, while also preventing fuel vapor from escaping into the atmosphere through the fuel tank cap and causing environmental pollution, and without increasing fuel consumption. Therefore, it solves the problems of fuel vapor escaping into the atmosphere from the fuel tank cap and causing environmental pollution and increased fuel consumption that occur when related technologies address fuel desorption.

[0092] This application also provides a vehicle including the above-described fuel vapor desorption control system.

[0093] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0094] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0095] Any process or method described in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or N executable instructions for implementing custom logic functions or processes, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as should be understood by those skilled in the art to which embodiments of this application pertain.

[0096] It should be understood that various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any of the following techniques known in the art, or a combination thereof: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (FPGAs), field-programmable gate arrays (FPGAs), etc.

[0097] Those skilled in the art will understand that all or part of the steps of the methods implementing the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.

[0098] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A method for controlling fuel vapor desorption, characterized in that, Includes the following steps: Identify the fuel type and fuel tank pressure during vehicle operation; The target desorption command for the fuel tank is determined based on the fuel type and the tank pressure. The fuel vapor desorption operation of the oil tank is controlled according to the target desorption command.

2. The control method for fuel vapor desorption according to claim 1, characterized in that, The fuel type includes liquid fuel and gaseous fuel. Determining the target desorption command for the fuel tank based on the fuel type and the tank pressure includes: If the fuel type is liquid fuel, the target desorption command is a desorption start command; If the fuel type is gaseous fuel, the target desorption command for the fuel tank is determined based on the tank pressure.

3. The control method for fuel vapor desorption according to claim 2, characterized in that, The step of determining the target desorption command for the oil tank based on the oil tank pressure includes: If the oil tank pressure is greater than the opening threshold, then the target desorption command is a desorption opening command; If the tank pressure is less than the shut-off threshold, then the target desorption command is a desorption shut-off command.

4. The control method for fuel vapor desorption according to claim 1, characterized in that, The step of controlling the fuel vapor desorption action of the oil tank according to the target desorption command includes: If the target desorption command is a desorption start command, then the fuel vapor desorption of the oil tank is started; If the target desorption command is a desorption shutdown command, then the desorption of fuel vapor from the oil tank is stopped.

5. The control method for fuel vapor desorption according to claim 4, characterized in that, The process of stopping the desorption of fuel vapor from the oil tank also includes: Identify the on / off status of the pipeline between the carbon canister and the fuel tank; If the on / off state is the on state, then disconnect the pipeline between the carbon canister and the oil tank.

6. The control method for fuel vapor desorption according to claim 1, characterized in that, After controlling the fuel vapor desorption operation of the oil tank according to the target desorption command, the method further includes: Identify the on / off status of the pipeline between the carbon canister and the fuel tank; If the on / off state is off, then the pipeline between the carbon canister and the oil tank is connected.

7. A control device for fuel vapor desorption, characterized in that, include: The identification module is used to identify the fuel type and fuel tank pressure during vehicle operation; The determination module is used to determine the target desorption command of the fuel tank based on the fuel type and the fuel tank pressure; The control module is used to control the fuel vapor desorption operation of the oil tank according to the target desorption command.

8. A controller, characterized in that, include: A memory, a processor, and a computer program stored in the memory and executable on the processor, the processor executing the program to implement the control method for fuel vapor desorption according to any one of claims 1-6.

9. A control system for fuel vapor desorption, characterized in that, include: Engine, fuel tank, and carbon canister; A pressure sensor is installed at the target location of the fuel tank; A first switch is installed on the pipeline between the engine and the carbon canister; A second switch is installed on the pipeline between the oil tank and the carbon canister; The controller of claim 8, wherein the controller is connected to the pressure sensor, the first switch and the second switch respectively.

10. A vehicle, characterized in that, The control system for fuel vapor desorption as described in claim 8.

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