Desorption control method, apparatus, terminal equipment and computer-readable storage medium

Abstract

This application discloses a desorption control method, apparatus, terminal equipment, and computer-readable storage medium, relating to the field of vehicle technology. The desorption control method is applied to an evaporative adsorption control system, which includes an active oil-gas separator, a crankcase, a carbon canister solenoid valve, and a carbon canister. The method includes: controlling the active oil-gas separator to perform an oil-gas extraction operation on the crankcase and acquiring the real-time crankcase pressure value; if the real-time crankcase pressure value is negative, determining the desorption flow rate corresponding to the evaporative adsorption control system, and determining the set duty cycle corresponding to the carbon canister solenoid valve based on the desorption flow rate; adjusting the carbon canister solenoid valve according to the set duty cycle so that the carbon canister performs the desorption operation according to the desorption flow rate. Using this application can achieve the technical effect of continuous desorption process, thereby avoiding fuel leakage into the intake manifold during desorption, reducing the risk of fuel leakage, and improving engine stability.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, and in particular to a desorption control method, device, terminal equipment, and computer-readable storage medium. Background Technology

[0002] With the continuous development of the automotive industry, the emission requirements for fuel vapor are becoming increasingly stringent. Therefore, fuel vehicles are gradually adopting evaporative adsorption control systems to control the carbon canister that adsorbs fuel vapor to perform fuel desorption operations, so that the fuel adsorbed by the carbon canister is reintroduced into the engine for combustion, thereby preventing fuel vapor from being directly emitted into the outside world.

[0003] Currently, in order to perform desorption operations, the desorption lines in the evaporative adsorption control system are often introduced into the engine's intake manifold and turbocharger intake port, so that the carbon canister performs desorption operations based on the negative pressure generated by the intake manifold and turbocharger. However, the above-mentioned desorption operation has high requirements for operating conditions, and the desorption process is not continuous. It is also very easy for fuel-laden gas mixture to enter the intake manifold during the desorption process, which will affect the engine's intake control, deteriorate combustion in the engine, and affect the engine's stability. Summary of the Invention

[0004] The main objective of this application is to provide a desorption control method, apparatus, terminal equipment, and computer-readable storage medium, which aims to make the desorption process continuous, thereby reducing the risk of fuel leakage and improving engine stability.

[0005] To achieve the above objectives, this application provides a desorption control method. The desorption control method is applied to an evaporative adsorption control system, which includes an active oil-gas separator, a crankcase, a carbon canister solenoid valve, and a carbon canister. The desorption control method includes the following steps:

[0006] The active oil-gas separator is controlled to perform oil-gas extraction operation on the crankcase and to obtain the real-time crankcase pressure value corresponding to the crankcase.

[0007] If the real-time crankcase pressure value is negative, then the desorption flow rate corresponding to the evaporation adsorption control system is determined, and the set duty cycle corresponding to the carbon canister solenoid valve is determined based on the desorption flow rate.

[0008] Adjust the carbon canister solenoid valve according to the set duty cycle so that the carbon canister performs desorption operation according to the desorption flow rate.

[0009] Furthermore, the evaporative adsorption control system also includes an engine, and the step of determining the desorption flow rate corresponding to the evaporative adsorption control system includes:

[0010] Obtain the engine speed and oil pressure values ​​corresponding to the engine;

[0011] The desorption capacity value of the active oil-gas separator is determined based on the engine speed, the oil pressure value, and the real-time crankcase pressure value, and the desorption flow rate of the evaporative adsorption control system is determined based on the desorption capacity value.

[0012] Furthermore, the step of determining the desorption flow rate corresponding to the evaporation adsorption control system further includes:

[0013] Obtain a preset mapping table and determine the real-time pressure ratio corresponding to the carbon canister;

[0014] The mapping table is queried based on the real-time pressure ratio to determine a target pressure ratio that is consistent with the real-time pressure ratio from among the standard pressure ratios contained in the mapping table.

[0015] Based on the mapping relationship contained in the mapping table, the target desorption flow rate corresponding to the target pressure ratio is determined from each standard desorption flow rate contained in the mapping table, and the target desorption flow rate is determined as the desorption flow rate.

[0016] Furthermore, the evaporation adsorption control system also includes a first pressure sensor and a second pressure sensor, wherein the first pressure sensor is located in the upstream pipeline of the carbon canister and the second pressure sensor is located in the downstream pipeline of the carbon canister.

[0017] The step of determining the real-time pressure ratio corresponding to the carbon canister includes:

[0018] The real-time upstream pressure value corresponding to the carbon canister is determined by the first pressure sensor, and the real-time downstream pressure value corresponding to the carbon canister is determined by the second pressure sensor.

[0019] The real-time pressure ratio corresponding to the carbon canister is determined based on the real-time upstream pressure value and the real-time downstream pressure value.

[0020] Further, the step of determining the set duty cycle corresponding to the carbon canister solenoid valve based on the desorption flow rate includes:

[0021] The target desorption flow is determined by querying the mapping table based on the desorption flow;

[0022] Based on the mapping relationship, a target duty cycle corresponding to the target desorption flow rate is determined from the standard duty cycles included in the mapping table, and the target duty cycle is determined as the set duty cycle corresponding to the carbon canister solenoid valve.

[0023] Furthermore, prior to the step of controlling the active oil-gas separator to perform oil-gas extraction operation on the crankcase, the method further includes:

[0024] Obtain the real-time carbon canister pressure value corresponding to the carbon canister, determine the fuel storage capacity corresponding to the carbon canister based on the real-time carbon canister pressure value, and compare the fuel storage capacity with a preset storage threshold to obtain a first comparison result;

[0025] Obtain the engine coolant temperature corresponding to the engine, and compare the engine coolant temperature with a preset temperature threshold to obtain a second comparison result;

[0026] If the first comparison result indicates that the fuel storage has reached the storage threshold, and the second comparison result indicates that the engine coolant temperature has reached the temperature threshold, then the step of controlling the active oil-gas separator to perform oil-gas extraction operation on the crankcase is executed.

[0027] Furthermore, prior to the step of controlling the active oil-gas separator to perform oil-gas extraction operation on the crankcase, the method further includes:

[0028] Obtain the preset standard desorption flow rate, the standard duty cycle corresponding to each standard desorption flow rate, and the standard pressure ratio corresponding to each standard desorption flow rate;

[0029] Determine the mapping relationship between each of the standard desorption flow rates, each of the standard desorption flow rates, and each of the standard pressure ratios, and construct a mapping table based on the mapping relationship, each of the standard desorption flow rates, each of the standard duty cycles, and each of the standard pressure ratios.

[0030] Furthermore, to achieve the above objectives, this application also provides a desorption control device, which is applied to an evaporative adsorption control system. The evaporative adsorption control system includes an active oil-gas separator, a crankcase, a carbon canister solenoid valve, and a carbon canister. The device comprises:

[0031] The pressure detection module is used to control the active oil-gas separator to perform oil-gas extraction operation on the crankcase and to obtain the real-time crankcase pressure value corresponding to the crankcase.

[0032] The duty cycle calculation module is used to determine the desorption flow rate corresponding to the evaporative adsorption control system if the real-time crankcase pressure value is negative, and to determine the set duty cycle corresponding to the carbon canister solenoid valve based on the desorption flow rate.

[0033] The desorption execution module is used to adjust the carbon canister solenoid valve according to the set duty cycle, so that the carbon canister performs the desorption operation according to the desorption flow rate.

[0034] In addition, to achieve the above objectives, this application also provides a terminal device, the terminal device comprising: a memory, a processor, and a desorption control program stored in the memory and executable on the processor, wherein the desorption control program, when executed by the processor, implements the steps of the desorption control method as described above.

[0035] In addition, to achieve the above objectives, this application also provides a computer-readable storage medium storing a desorption control program, which, when executed by a processor, implements the steps of the desorption control method as described above.

[0036] The desorption control method, apparatus, terminal equipment, and computer-readable storage medium provided in this application embodiment are applied to an evaporative adsorption control system. The evaporative adsorption control system includes an active oil-gas separator, a crankcase, a carbon canister solenoid valve, and a carbon canister. The active oil-gas separator is controlled to perform an oil-gas extraction operation on the crankcase, and the real-time crankcase pressure value corresponding to the crankcase is obtained. If the real-time crankcase pressure value is negative, the desorption flow rate corresponding to the evaporative adsorption control system is determined, and the set duty cycle corresponding to the carbon canister solenoid valve is determined based on the desorption flow rate. The carbon canister solenoid valve is adjusted according to the set duty cycle so that the carbon canister performs a desorption operation according to the desorption flow rate.

[0037] In this embodiment, the evaporative adsorption control system controls the operation of the active oil-gas separator through an electronic control unit configured inside the terminal equipment, thereby performing oil-gas extraction operations on the crankcase. Simultaneously, the evaporative adsorption control system calls a pressure sensor through the electronic control unit to detect the crankcase and obtain the real-time crankcase pressure value when oil-gas is extracted. The electronic control unit then determines whether the real-time crankcase pressure value is negative. If the electronic control unit determines that the real-time crankcase pressure value is negative, it calls the internally preset carbon canister calculation model to calculate the desorption flow rate required for the evaporative adsorption control system to perform the desorption operation. Based on the desorption flow rate, it determines the set duty cycle corresponding to the carbon canister solenoid valve located at the carbon canister. Finally, the electronic control unit outputs the set duty cycle, and the evaporative adsorption control system adjusts the carbon canister solenoid valve according to the set duty cycle to change the channel size of the carbon canister solenoid valve, thereby causing the carbon canister to perform the desorption operation according to the desorption flow rate.

[0038] Thus, this application controls the oil-gas separator to actively extract oil and gas from the crankcase to create a negative pressure inside the crankcase. Utilizing this negative pressure, and the oil-gas separator's strong suction capacity and ability to be driven solely by oil pressure, the engine, once started normally and oil pressure established, can drive the carbon canister to perform desorption. This allows the desorption operation to adapt to any operating condition, achieving a continuous desorption process. Furthermore, it prevents fuel leakage into the intake manifold during desorption, reducing the risk of fuel leakage and improving engine stability. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the structure of the terminal device in the hardware operating environment involved in the embodiments of this application;

[0040] Figure 2 This is a flowchart illustrating the first embodiment of the desorption control method of this application;

[0041] Figure 3 This is a flowchart illustrating the second embodiment of the desorption control method of this application;

[0042] Figure 4 This is a flowchart illustrating the third embodiment of the desorption control method of this application;

[0043] Figure 5 This is a schematic diagram of the evaporation adsorption control system structure involved in an embodiment of the desorption control method of this application;

[0044] Figure 6 This is a flowchart illustrating a preferred embodiment of the desorption control method of this application;

[0045] Figure 7 This is a schematic diagram of the functional modules involved in one embodiment of the desorption control method of this application.

[0046] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0047] It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit this application.

[0048] Reference Figure 1 , Figure 1 This is a schematic diagram of the terminal device structure of the hardware operating environment involved in the embodiments of this application.

[0049] It should be noted that the terminal device in the embodiments of this application can be a device that executes the desorption control method of this application. Specifically, the terminal device can be a vehicle or a terminal device connected to the evaporation adsorption control system of the vehicle, a mobile terminal, a data storage control terminal, a PC, or other terminals.

[0050] like Figure 1 As shown, the terminal device may include: a processor 1001, such as a central processing unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. The communication bus 1002 is used to enable communication between these components. The user interface 1003 may include a display screen and an input unit such as a keyboard; optionally, the user interface 1003 may also include a standard wired interface or a wireless interface. The network interface 1004 may optionally include a standard wired interface or a wireless interface (such as a Wi-Fi interface). The memory 1005 may be a high-speed random access memory (RAM) or a stable non-volatile memory (NVM), such as a disk drive. The memory 1005 may also optionally be a storage device independent of the aforementioned processor 1001.

[0051] Those skilled in the art will understand that Figure 1 The structure shown does not constitute a limitation on the terminal device and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0052] like Figure 1 As shown, the memory 1005, which serves as a storage medium, may include an operating system, a data storage module, a network communication module, a user interface module, and a de-attachment control program.

[0053] exist Figure 1 In the terminal device shown, the network interface 1004 is mainly used for data communication with other devices; the user interface 1003 is mainly used for data interaction with the user; the processor 1001 and the memory 1005 in the terminal device of this application can be set in the terminal device. The terminal device calls the de-attachment control program stored in the memory 1005 through the processor 1001 and executes various embodiments of the de-attachment control method provided in the embodiments of this application.

[0054] Based on the aforementioned terminal equipment, the overall concept of the desorption control method of this application is provided.

[0055] As emission requirements for fuel vapor become increasingly stringent, fuel-powered vehicles are gradually adopting evaporative adsorption control systems to control the carbon canisters that adsorb fuel vapors to perform fuel desorption operations. This allows the fuel adsorbed in the carbon canisters to be reintroduced into the engine for combustion, thereby preventing fuel vapors from being directly emitted into the environment.

[0056] Currently, in order to perform desorption operations, the desorption lines in the evaporative adsorption control system are often introduced into the engine's intake manifold and turbocharger intake port, so that the carbon canister performs desorption operations based on the negative pressure generated by the intake manifold and turbocharger. However, the above-mentioned desorption operation has high requirements for operating conditions, and the desorption process is not continuous. It is also very easy for fuel-laden gas mixture to enter the intake manifold during the desorption process, which will affect the engine's intake control, deteriorate combustion in the engine, and affect the engine's stability.

[0057] To address the aforementioned issues, this application proposes a desorption control method applied to an evaporative adsorption control system. The evaporative adsorption control system includes an active oil-gas separator, a crankcase, a carbon canister solenoid valve, and a carbon canister. The desorption control method comprises the following steps: controlling the active oil-gas separator to perform an oil-gas extraction operation on the crankcase and acquiring the real-time crankcase pressure value; if the real-time crankcase pressure value is negative, determining the desorption flow rate corresponding to the evaporative adsorption control system, and determining the set duty cycle corresponding to the carbon canister solenoid valve based on the desorption flow rate; adjusting the carbon canister solenoid valve according to the set duty cycle so that the carbon canister performs a desorption operation according to the desorption flow rate.

[0058] Thus, this application controls the oil-gas separator to actively extract oil and gas from the crankcase to create a negative pressure inside the crankcase. Utilizing this negative pressure, and the oil-gas separator's strong suction capacity and ability to be driven solely by oil pressure, the engine, once started normally and oil pressure established, can drive the carbon canister to perform desorption. This allows the desorption operation to adapt to any operating condition, achieving a continuous desorption process. Furthermore, it prevents fuel leakage into the intake manifold during desorption, reducing the risk of fuel leakage and improving engine stability.

[0059] Based on the above-described terminal device and the overall concept of the desorption control method of this application, various embodiments of the desorption control method of this application are further proposed.

[0060] Please refer to Figure 2 , Figure 2 This is a flowchart illustrating the first embodiment of the desorption control method of this application.

[0061] It should be understood that although the logical order is shown in the flowchart, in some cases the desorption control method of this application may of course perform the steps shown or described in a different order than that shown here.

[0062] Furthermore, in this embodiment, the desorption control method of this application is applied to a terminal device connected to the evaporative adsorption control system and electronic control unit configured in the vehicle.

[0063] like Figure 2 As shown, in this embodiment, the desorption control method of this application is applied to an evaporative adsorption control system, which includes an active oil-gas separator, a crankcase, a carbon canister solenoid valve, and a carbon canister, and may include the following steps:

[0064] Step S10: Control the active oil-gas separator to perform oil-gas extraction operation on the crankcase and obtain the real-time crankcase pressure value corresponding to the crankcase;

[0065] Please refer to Figure 5 , Figure 5 This is a schematic diagram of the evaporation adsorption control system structure according to an embodiment of the desorption control method of this application, as shown below. Figure 5 As shown, the fuel vapor generated in the fuel tank first enters the carbon canister. Then, during the desorption operation, the fuel vapor is drawn from the carbon canister through the carbon canister solenoid valve and the check valve into the active oil-gas separator for separation. After being separated by the active oil-gas separator, the exhaust gas flows into the intake port of the turbocharger to re-enter the cylinder for combustion.

[0066] In this embodiment, the evaporative adsorption control system controls the operation of the active oil-gas separator through the electronic control unit configured inside the terminal equipment, thereby extracting oil and gas from the crankcase through the active oil-gas separator. At the same time, the evaporative adsorption control system detects the crankcase through the pressure sensing device configured inside the control system, thereby obtaining the real-time crankcase pressure value when oil and gas are extracted, and determining whether the real-time crankcase pressure value is negative.

[0067] For example, when the terminal device is running, it calls the evaporative adsorption control system integrated on the control motherboard. The evaporative adsorption control system controls the operation of the active oil-gas separator through the ECU (Electronic Control Unit) configured in the terminal device. The active oil-gas separator actively draws in the oil and gas in the crankcase to create a negative pressure environment in the crankcase. At the same time, the evaporative adsorption control system controls the crankcase pressure sensor configured in the terminal device through the ECU to detect the crankcase and obtain the real-time crankcase pressure value corresponding to the oil and gas being drawn in. The ECU then determines whether the real-time carbon canister pressure value is negative.

[0068] Step S20: If the real-time crankcase pressure value is negative, determine the desorption flow rate corresponding to the evaporative adsorption control system, and determine the set duty cycle corresponding to the carbon canister solenoid valve based on the desorption flow rate;

[0069] The duty cycle is set as the ratio of the energizing time of the carbon canister solenoid valve to the entire pulse cycle. It can be understood that during the operation of the carbon canister solenoid valve, if the set duty cycle is larger, the average current in the magnetizing coil configured inside the carbon canister solenoid valve will be larger, thereby making the channel opening of the carbon canister solenoid valve larger; similarly, if the set duty cycle is smaller, the channel opening of the carbon canister solenoid valve will be smaller.

[0070] In this embodiment, if the electronic control unit determines that the real-time crankcase pressure value is negative, it calls the internally preset carbon canister calculation model to calculate and determine the desorption flow rate corresponding to the desorption operation when the evaporative adsorption control system performs the desorption operation. The carbon canister calculation model then determines the set duty cycle corresponding to the carbon canister solenoid valve when performing the desorption operation according to the desorption flow rate.

[0071] For example, if the ECU determines that the real-time crankcase pressure value is negative, it calls the preset carbon canister calculation model to calculate and determine the desorption capacity of the active oil-gas separator, and determines the desorption flow rate corresponding to the evaporative adsorption control system when performing the desorption operation based on the desorption capacity. Then, the carbon canister calculation model calculates the set duty cycle corresponding to the carbon canister solenoid valve when performing the desorption operation according to the desorption flow rate based on the obtained desorption flow rate.

[0072] It should be noted that the carbon canister calculation model is mainly used to calculate parameters such as desorption flow rate, set duty cycle and pressure ratio. This carbon canister model is pre-trained by technicians and deployed in the ECU. It is understood that the specific training process of this carbon canister calculation model can refer to the training process of other data calculation models of the same type, and this application does not impose any restrictions on it.

[0073] Furthermore, in one feasible embodiment, the evaporative adsorption control system also includes an engine, and the step of "determining the desorption flow rate corresponding to the evaporative adsorption control system" in step S20 above may specifically include:

[0074] Step S201: Obtain the engine speed and oil pressure values ​​corresponding to the engine;

[0075] In this embodiment, the electronic control unit calls the detection module to detect the engine in the evaporative adsorption control system, thereby obtaining the engine speed and oil pressure values ​​corresponding to the engine, and inputting the engine speed, the oil pressure value and the real-time crankcase pressure value corresponding to the crankcase into the carbon canister calculation model.

[0076] Step S202: Determine the desorption capacity value corresponding to the active oil-gas separator based on the engine speed, the oil pressure value and the real-time crankcase pressure value, and determine the desorption flow rate corresponding to the evaporative adsorption control system based on the desorption capacity value;

[0077] In this embodiment, the carbon canister calculation model calculates the desorption capacity value corresponding to the active oil-gas separator based on the obtained engine speed, oil pressure value and real-time crankcase pressure value. The carbon canister calculation model then determines the desorption flow rate value corresponding to the evaporative adsorption control system when performing the desorption operation based on the desorption capacity value.

[0078] For example, the ECU first detects the engine's running time. After determining that the engine's running time has reached a preset time threshold, that is, after determining that the engine has been running for a period of time, it calls the detection module to detect the engine in the vapor adsorption control system, thereby obtaining the engine speed and oil pressure values. The obtained engine speed, oil pressure values ​​and real-time crankcase pressure values ​​are then input into the carbon canister calculation model. Subsequently, the carbon canister calculation model calculates based on the engine speed, oil pressure values ​​and real-time crankcase pressure values ​​to determine the desorption capacity value of the active oil-gas separator when performing the desorption operation. The carbon canister calculation model then calculates based on the desorption capacity value to determine the corresponding desorption flow rate of the evaporative adsorption control system when performing the desorption operation.

[0079] Furthermore, in a feasible embodiment, the step of "determining the desorption flow rate corresponding to the evaporation adsorption control system" in step S20 above may further include:

[0080] Step S203: Obtain a preset mapping table and determine the real-time pressure ratio corresponding to the carbon canister;

[0081] In this embodiment, the electronic control unit obtains a mapping table pre-stored by the technician, which includes standard pressure ratios, standard duty cycles, and standard desorption flow rates. At the same time, the electronic control unit detects the carbon canister through a pressure sensing device deployed in the system to obtain the real-time pressure ratio corresponding to the carbon canister.

[0082] Step S204: Query the mapping table based on the real-time pressure ratio to determine the target pressure ratio that is consistent with the real-time pressure ratio among the standard pressure ratios contained in the mapping table;

[0083] In this embodiment, the electronic control unit queries the obtained real-time pressure ratio mapping table to determine the target pressure ratio that matches the real-time pressure ratio from among the standard pressure ratios included in the mapping table.

[0084] Step S205: Determine the target desorption flow rate corresponding to the target pressure ratio from each standard desorption flow rate contained in the mapping table according to the mapping relationship contained in the mapping table, and determine the target desorption flow rate as the desorption flow rate;

[0085] In this embodiment, the electronic control unit determines the target desorption flow rate corresponding to the target pressure ratio from among the standard desorption flows included in the mapping table based on the mapping relationship between each standard pressure ratio, each standard duty cycle and each standard desorption flow rate, and determines the desorption flow rate corresponding to the evaporative adsorption control system when performing the desorption operation.

[0086] For example, in addition to calculating the desorption flow rate based on engine parameters using the carbon canister calculation model, the ECU can also obtain a mapping table pre-stored by technicians, which includes standard pressure ratios, standard duty cycles, and standard desorption flows. Simultaneously, the ECU detects the carbon canister using pressure sensors 1 and 2 configured within the system to obtain the real-time pressure ratio corresponding to the carbon canister. Then, the ECU queries the mapping table MAP based on the obtained real-time pressure ratio to determine the target pressure ratio that matches the real-time pressure ratio value among the standard pressure ratios included in the MAP. Subsequently, based on the mapping relationship between the standard pressure ratios, standard duty cycles, and standard desorption flows included in the MAP, the ECU determines the target desorption flow rate corresponding to the target pressure ratio among the standard desorption flows, and identifies the target desorption flow rate as the desorption flow rate corresponding to the evaporative adsorption control system when performing the desorption operation.

[0087] Furthermore, in one feasible embodiment, the evaporation adsorption control system further includes a first pressure sensor and a second pressure sensor, wherein the first pressure sensor is located in the upstream pipeline of the carbon canister and the second pressure sensor is located in the downstream pipeline of the carbon canister.

[0088] The step of "determining the real-time pressure ratio corresponding to the carbon canister" in step S203 above may specifically include:

[0089] Step S2031: Determine the real-time upstream pressure value corresponding to the carbon canister using the first pressure sensor, and determine the real-time downstream pressure value corresponding to the carbon canister using the second pressure sensor;

[0090] Step S2032: Determine the real-time pressure ratio corresponding to the carbon canister based on the real-time upstream pressure value and the real-time downstream pressure value;

[0091] For example, the ECU calls pressure sensor 1 configured in the system to detect the upstream pipeline of the carbon canister, thereby obtaining the real-time upstream pressure value corresponding to the carbon canister. At the same time, the ECU calls pressure sensor 2 to detect the downstream pipeline of the carbon canister, thereby obtaining the real-time downstream pressure value corresponding to the carbon canister. Then, the evaporation adsorption control system compares the obtained real-time upstream pressure value and real-time downstream pressure value to determine the real-time pressure ratio corresponding to the carbon canister.

[0092] Furthermore, in a feasible embodiment, the step of "determining the set duty cycle corresponding to the carbon canister solenoid valve based on the desorption flow rate" in step S20 above may specifically include:

[0093] Step S206: Query the mapping table based on the desorption flow to determine the target desorption flow among the standard desorption flows;

[0094] In this embodiment, after determining the desorption flow rate, the electronic control unit queries a mapping table based on the desorption flow rate to determine the target desorption flow rate that matches the desorption flow rate among the standard desorption flows rate included in the mapping table.

[0095] Step S207: Determine the target duty cycle corresponding to the target desorption flow rate from the standard duty cycles included in the mapping table according to the mapping relationship, and set the target duty cycle as the set duty cycle corresponding to the carbon canister solenoid valve;

[0096] In this embodiment, the electronic control unit determines the target duty cycle corresponding to the target desorption flow rate from the standard duty cycles included in the mapping table according to the above mapping relationship contained in the mapping table, and determines the target duty cycle as the set duty cycle corresponding to the carbon canister solenoid valve.

[0097] For example, after determining the desorption flow rate corresponding to the evaporative adsorption control system when performing the desorption operation, the ECU queries the MAP based on the desorption flow rate to determine the target desorption flow rate with the same value among the standard desorption flow rates included in the MAP. Then, based on the mapping relationship between the standard pressure ratios, standard duty cycles and standard desorption flow rates included in the MAP, the ECU determines the target duty cycle corresponding to the target desorption flow rate among the standard duty cycles included, and determines the target duty cycle as the set duty cycle corresponding to the carbon canister solenoid valve.

[0098] Step S30: Adjust the carbon canister solenoid valve according to the set duty cycle so that the carbon canister performs desorption operation according to the desorption flow rate;

[0099] In this embodiment, the electronic control unit outputs a calculated set duty cycle, and the evaporative adsorption control system then adjusts the channel size of the carbon canister solenoid valve according to the set duty cycle, so that the carbon canister performs desorption operation according to the desorption flow rate.

[0100] For example, the ECU uploads the calculated set duty cycle to the evaporative adsorption control system, which then adjusts the pulse signal based on the set duty cycle to change the channel size of the carbon canister solenoid valve, thereby enabling the carbon canister to perform desorption operation according to the calculated desorption flow rate.

[0101] In this embodiment, the evaporative adsorption control system controls the operation of the active oil-gas separator through an electronic control unit configured inside the terminal equipment. This active oil-gas separator extracts oil and gas from the crankcase. Simultaneously, the evaporative adsorption control system uses a pressure sensor configured within the electronic control unit to detect the crankcase pressure, thereby obtaining the real-time crankcase pressure value when oil and gas are extracted. It then determines whether this real-time crankcase pressure value is negative. If the electronic control unit detects a negative real-time crankcase pressure value, it calls a pre-set carbon canister calculation model to calculate and determine the desorption flow rate corresponding to the evaporative adsorption control system's desorption operation. The carbon canister calculation model then determines the set duty cycle of the carbon canister solenoid valve based on this desorption flow rate. Finally, the electronic control unit outputs the calculated set duty cycle, and the evaporative adsorption control system adjusts the channel size of the carbon canister solenoid valve according to this set duty cycle, causing the carbon canister to perform the desorption operation according to the desorption flow rate.

[0102] Thus, this application controls the oil-gas separator to actively extract oil and gas from the crankcase to create a negative pressure inside the crankcase. Utilizing this negative pressure, and the oil-gas separator's strong suction capacity and ability to be driven solely by oil pressure, the engine, once started normally and oil pressure established, can drive the carbon canister to perform desorption. This allows the desorption operation to adapt to any operating condition, achieving a continuous desorption process. Furthermore, it prevents fuel leakage into the intake manifold during desorption, reducing the risk of fuel leakage and improving engine stability.

[0103] Furthermore, based on the first embodiment of the desorption control method of this application described above, a second embodiment of the desorption control method of this application is proposed herein.

[0104] Please refer to Figure 3 , Figure 3 This is a flowchart illustrating the second embodiment of the desorption control method of this application, as shown below. Figure 3 As shown, prior to step S10 above, the desorption control method of this application may further include the following steps:

[0105] Step A10: Obtain the real-time carbon canister pressure value corresponding to the carbon canister, determine the fuel storage capacity corresponding to the carbon canister based on the real-time carbon canister pressure value, and compare the fuel storage capacity with a preset storage threshold to obtain a first comparison result;

[0106] In this embodiment, before controlling the operation of the active oil-gas separator, the electronic control unit first calls the pressure detection device to detect the carbon canister, thereby obtaining the real-time carbon canister pressure value, and then calls the carbon canister calculation model to calculate the fuel storage capacity corresponding to the carbon canister based on the real-time carbon canister pressure value. The electronic control unit then compares the fuel storage capacity with the preset storage threshold to obtain the first comparison result.

[0107] Step A20: Obtain the engine coolant temperature corresponding to the engine, and compare the engine coolant temperature with a preset temperature threshold to obtain a second comparison result;

[0108] In this embodiment, the electronic control unit calls the temperature sensor to detect the engine and obtain the engine coolant temperature. The electronic control unit then compares the engine coolant temperature with a preset temperature threshold to obtain a second comparison result.

[0109] Step A30: If the first comparison result is that the fuel storage reaches the storage threshold, and the second comparison result is that the engine water temperature reaches the temperature threshold, then execute the step of controlling the active oil-gas separator to perform oil-gas extraction operation on the crankcase.

[0110] In this embodiment, if the electronic control unit determines that the first comparison result is that the fuel storage has reached the storage threshold and the second comparison result is that the engine water temperature has reached the temperature threshold, it controls the active oil-gas separator to operate to perform oil-gas extraction operation on the crankcase.

[0111] For example, before the ECU controls the operation of the active oil-gas separator, it first calls the pressure sensor 2 in the system to detect the carbon canister, thereby determining the real-time carbon canister pressure value, and inputs the real-time carbon canister pressure value into the carbon canister calculation model. The carbon canister calculation model calculates the corresponding fuel storage capacity of the carbon canister based on the real-time carbon canister pressure value. At the same time, the ECU then obtains the storage capacity threshold preset by the technician, and compares the fuel storage capacity with the storage capacity threshold to obtain the first comparison result.

[0112] Then, the ECU calls the temperature sensor to detect the engine and obtain the engine coolant temperature. At the same time, the ECU obtains the temperature threshold preset by the technician and compares the engine coolant temperature with the temperature threshold to obtain a second comparison result.

[0113] Finally, if the ECU determines that the first comparison result is that the fuel storage has reached the storage threshold, and the second comparison result is that the engine coolant temperature has reached the temperature threshold, then it determines that the engine is in a stable operating state. In this state, the evaporative adsorption control system can perform desorption operation, thereby starting to control the operation of the active oil-gas separator to extract oil and gas from the crankcase.

[0114] In this embodiment, before controlling the operation of the active oil-gas separator, the electronic control unit first calls the pressure detection device to detect the carbon canister, thereby obtaining the real-time carbon canister pressure value. Then, it calls the carbon canister calculation model to calculate the fuel storage capacity of the carbon canister based on the real-time carbon canister pressure value. The electronic control unit then compares the fuel storage capacity with a preset storage threshold to obtain a first comparison result. After that, the electronic control unit calls the temperature sensor to detect the engine, thereby obtaining the engine coolant temperature. The electronic control unit then compares the engine coolant temperature with a preset temperature threshold to obtain a second comparison result. Finally, if the electronic control unit determines that the first comparison result is that the fuel storage capacity has reached the storage threshold and the second comparison result is that the engine coolant temperature has reached the temperature threshold, it controls the active oil-gas separator to operate to perform oil and gas extraction operation on the crankcase.

[0115] Thus, this application adopts the method of detecting the engine water temperature and the fuel level in the carbon canister before controlling the operation of the active oil-gas separator, thereby achieving the purpose of ensuring that the steam adsorption control system can perform desorption operation while the engine is running smoothly.

[0116] Furthermore, based on the first and / or second embodiments of the desorption control method of this application described above, a third embodiment of the desorption control method of this application is proposed herein.

[0117] Please refer to Figure 4 , Figure 4 This is a flowchart illustrating the third embodiment of the desorption control method of this application, as shown below. Figure 4 As shown, prior to step S10 above, the desorption control method of this application may further include the following steps:

[0118] Step B10: Obtain the preset standard desorption flow rate, the standard duty cycle corresponding to each standard desorption flow rate, and the standard pressure ratio corresponding to each standard desorption flow rate;

[0119] In this embodiment, when the engine is running, the evaporative adsorption control system acquires preset standard desorption flow rates and determines the standard duty cycle and standard pressure ratio corresponding to each standard desorption flow rate.

[0120] Step B20: Determine the mapping relationship between each of the standard desorption flow rates, each of the standard desorption flow rates, and each of the standard pressure ratios; and construct a mapping table based on the mapping relationship, each of the standard desorption flow rates, each of the standard duty cycles, and each of the standard pressure ratios.

[0121] In this embodiment, the evaporative adsorption control system determines the mapping relationship between each standard desorption flow rate, each standard duty cycle, and each standard pressure ratio based on each standard desorption flow rate, each standard duty cycle, and each standard desorption flow rate. Based on this mapping relationship, each standard desorption flow rate, each standard set duty cycle, and each standard pressure ratio, a mapping table is constructed, and then the mapping table is stored in the electronic control unit.

[0122] For example, before controlling the operation of the active oil-gas separator, the evaporative adsorption control system first reads the storage device to obtain the standard desorption flow rate, the standard duty cycle corresponding to each standard desorption flow rate, and the standard pressure ratio corresponding to each standard desorption flow rate preset by the technician. Then, the evaporative adsorption control system determines the mapping relationship between each standard desorption flow rate, each standard duty cycle, and each standard pressure ratio based on each standard desorption flow rate, each standard duty cycle, and each standard pressure ratio. After that, the evaporative adsorption control system constructs a MAP based on the mapping relationship, with each standard pressure ratio as the X-axis, each standard duty cycle as the Y-axis, and each standard desorption flow rate as the Z-axis, and stores the MAP in the ECU.

[0123] It should be noted that, in this embodiment, after obtaining the mapping relationship, the evaporative adsorption control system can also construct an inverse MAP corresponding to the above MAP based on the mapping relationship, with each standard pressure ratio as the X-axis, each standard desorption flow rate as the Y-axis, and each standard duty cycle as the Z-axis, and store the inverse MAP in the ECU, so that the ECU can query the inverse MAP based on the desorption flow rate or real-time pressure ratio when needed to determine the set duty cycle corresponding to the solenoid valve.

[0124] In this embodiment, when the engine is running, the evaporative adsorption control system acquires preset standard desorption flow rates and determines the standard duty cycle and standard pressure ratio corresponding to each standard desorption flow rate. Then, the evaporative adsorption control system determines the mapping relationship between each standard desorption flow rate, each standard duty cycle and each standard pressure ratio based on each standard desorption flow rate, each standard duty cycle and each standard desorption flow rate. Based on this mapping relationship, each standard desorption flow rate, each standard set duty cycle and each standard pressure ratio, a mapping table is constructed and then stored in the electronic control unit.

[0125] Thus, this application adopts a mapping table based on the mapping relationship between each standard desorption flow rate, each standard duty cycle, and each standard pressure ratio. This allows the carbon canister calculation model to directly and quickly calculate the desorption flow rate and set duty cycle of the evaporation adsorption control system based on the mapping table during the desorption operation, thereby reducing the computational load of the model.

[0126] Furthermore, based on the above embodiments of the desorption control method of this application, preferred embodiments of the desorption control method of this application are proposed herein.

[0127] Please refer to Figure 6 , Figure 6 This is a flowchart illustrating a preferred embodiment of the desorption control method of this application.

[0128] like Figure 6 As shown, in this embodiment, the ECU first calls the detection device configured in the evaporative adsorption control system to detect the engine, thereby obtaining engine parameters such as engine coolant temperature, engine speed, and oil pressure. Simultaneously, the ECU calls the pressure sensor configured in the evaporative adsorption control system to detect the carbon canister, thereby obtaining the real-time carbon canister pressure value, and calculates the corresponding fuel level in the carbon canister based on this real-time pressure value. Then, the ECU determines whether the carbon canister needs desorption based on the obtained engine parameters and fuel level. If the ECU determines that the engine coolant temperature has reached a preset temperature threshold and the fuel level in the carbon canister has reached a preset level threshold, then... The carbon canister can perform desorption operations, which the ECU then controls to operate the active oil-gas separator to extract oil and gas from the crankcase. After that, the ECU calls the crankcase pressure sensor to detect the crankcase and obtain the real-time crankcase pressure value. It then determines whether the real-time crankcase pressure value is negative. If the ECU determines that the real-time crankcase pressure value is negative, it calls the internally preset carbon canister calculation model to calculate the carbon canister desorption flow rate corresponding to the evaporative adsorption control system when performing the desorption operation based on the obtained engine parameters. It also calls the pressure sensor to detect the carbon canister solenoid valve to obtain the upstream and downstream pressure ratio corresponding to the carbon canister solenoid valve (i.e., the real-time pressure ratio mentioned above).

[0129] Then, the ECU queries the preset MAP based on the acquired carbon canister desorption flow rate and the upstream-downstream pressure ratio to determine the carbon canister solenoid valve duty cycle (i.e., the set duty cycle mentioned above) corresponding to the carbon canister desorption flow rate and the upstream-downstream pressure ratio, and outputs the solenoid valve duty cycle so that the evaporative adsorption control system adjusts the pulse signal based on the solenoid valve duty cycle, thereby adjusting the channel size of the carbon canister solenoid valve, and thus causing the carbon canister to perform desorption operation according to the desorption flow rate until the desorption operation is completed.

[0130] In addition, to achieve the above objectives, this application also provides a desorption control and detection device, which is applied to an evaporative adsorption control system, the evaporative adsorption control system including an active oil-gas separator, a crankcase, a carbon canister solenoid valve, and a carbon canister.

[0131] Please refer to Figure 7 , Figure 7 This is a schematic diagram of the functional modules involved in an embodiment of the desorption control detection method of this application, as shown below. Figure 7 As shown, the device includes:

[0132] The pressure detection module 10 is used to control the active oil-gas separator to perform oil-gas extraction operation on the crankcase and to obtain the real-time crankcase pressure value corresponding to the crankcase.

[0133] The duty cycle calculation module 20 is used to determine the desorption flow rate corresponding to the evaporative adsorption control system if the real-time crankcase pressure value is negative, and to determine the set duty cycle corresponding to the carbon canister solenoid valve based on the desorption flow rate.

[0134] The desorption execution module 30 is used to adjust the carbon canister solenoid valve according to the set duty cycle so that the carbon canister performs the desorption operation according to the desorption flow rate.

[0135] Furthermore, the evaporative adsorption control system also includes an engine and a duty cycle calculation module 20, including:

[0136] The first parameter acquisition unit is used to acquire the engine speed and oil pressure values ​​corresponding to the engine.

[0137] The desorption flow calculation unit is used to determine the desorption capacity value corresponding to the active oil-gas separator based on the engine speed, the oil pressure value and the real-time crankcase pressure value, and to determine the desorption flow rate corresponding to the evaporative adsorption control system based on the desorption capacity value.

[0138] Furthermore, the duty cycle calculation module 20 also includes:

[0139] The second parameter acquisition unit is used to acquire a preset mapping table and determine the real-time pressure ratio corresponding to the carbon canister.

[0140] The first table query unit is used to query the mapping table based on the real-time pressure ratio, so as to determine the target pressure ratio that is consistent with the real-time pressure ratio among the standard pressure ratios contained in the mapping table;

[0141] The second table query unit is used to determine the target desorption flow rate corresponding to the target pressure ratio from each standard desorption flow rate contained in the mapping table according to the mapping relationship contained in the mapping table, and to determine the target desorption flow rate as the desorption flow rate.

[0142] Furthermore, the evaporation adsorption control system also includes a first pressure sensor and a second pressure sensor, wherein the first pressure sensor is located in the upstream pipeline of the carbon canister and the second pressure sensor is located in the downstream pipeline of the carbon canister.

[0143] The second parameter acquisition unit includes:

[0144] The pressure detection subunit is used to determine the real-time upstream pressure value corresponding to the carbon canister through the first pressure sensor, and to determine the real-time downstream pressure value corresponding to the carbon canister through the second pressure sensor.

[0145] The pressure calculation subunit is used to determine the real-time pressure ratio corresponding to the carbon canister based on the real-time upstream pressure value and the real-time downstream pressure value.

[0146] Furthermore, the duty cycle calculation module 20 also includes:

[0147] The third table query unit is used to query the mapping table based on the desorption flow to determine the target desorption flow in each of the standard desorption flows;

[0148] The fourth table query unit is used to determine the target duty cycle corresponding to the target desorption flow rate from the standard duty cycles included in the mapping table according to the mapping relationship, and to determine the target duty cycle as the set duty cycle corresponding to the carbon canister solenoid valve.

[0149] Furthermore, the pressure detection module 10 includes:

[0150] The first comparison unit is used to obtain the real-time carbon canister pressure value corresponding to the carbon canister, determine the fuel storage capacity corresponding to the carbon canister based on the real-time carbon canister pressure value, and compare the fuel storage capacity with a preset storage threshold to obtain a first comparison result.

[0151] The second comparison unit is used to obtain the engine coolant temperature corresponding to the engine and compare the engine coolant temperature with a preset temperature threshold to obtain a second comparison result.

[0152] The condition judgment unit is used to execute the step of controlling the active oil-gas separator to perform oil-gas extraction operation on the crankcase if the first comparison result is that the fuel storage reaches the storage threshold and the second comparison result is that the engine water temperature reaches the temperature threshold.

[0153] Furthermore, the pressure detection module 10 also includes:

[0154] The third parameter acquisition unit is used to acquire preset standard desorption flow rates, standard duty cycles corresponding to each standard desorption flow rate, and standard pressure ratios corresponding to each standard desorption flow rate.

[0155] The mapping table construction unit is used to determine the mapping relationship between each of the standard desorption flow rates, each of the standard desorption flow rates and each of the standard pressure ratios, and to construct a mapping table based on the mapping relationship, each of the standard desorption flow rates, each of the standard duty cycles and each of the standard pressure ratios.

[0156] In addition, this application also provides a terminal device having a desorption control program that can run on a processor, wherein when the terminal device executes the desorption control program, it implements the steps of the desorption control method as described in any of the above embodiments.

[0157] The specific embodiments of the terminal device in this application are basically the same as the embodiments of the above-described desorption control method, and will not be described in detail here.

[0158] In addition, this application also provides a computer-readable storage medium storing a desorption control program, which, when executed by a processor, implements the steps of the desorption control method as described in any of the above embodiments.

[0159] The specific embodiments of the computer-readable storage medium of this invention are basically the same as the embodiments of the above-described desorption control method, and will not be described in detail here.

[0160] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or system. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or system that includes that element.

[0161] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0162] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes several instructions to cause a terminal device (which can be a device that executes the desorption control method of this application, specifically a vehicle or a terminal device connected to the evaporation adsorption control system of a vehicle, a mobile terminal, a data storage control terminal, a PC, etc.) to execute the methods described in the various embodiments of this application.

[0163] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A desorption control method, characterized in that, The desorption control method is applied to an evaporative adsorption control system, which includes an active oil-gas separator, a crankcase, a carbon canister solenoid valve, and a carbon canister. The desorption control method includes the following steps: The active oil-gas separator is controlled to perform oil-gas extraction operation on the crankcase and to obtain the real-time crankcase pressure value corresponding to the crankcase. If the real-time crankcase pressure value is negative, then the desorption flow rate corresponding to the evaporative adsorption control system is determined, and the set duty cycle corresponding to the carbon canister solenoid valve is determined based on the desorption flow rate. The step of determining the desorption flow rate corresponding to the evaporative adsorption control system includes: Obtain a preset mapping table and determine the real-time pressure ratio corresponding to the carbon canister; query the mapping table based on the real-time pressure ratio to determine a target pressure ratio that matches the real-time pressure ratio from among the standard pressure ratios included in the mapping table; determine the target desorption flow rate corresponding to the target pressure ratio from among the standard desorption flow rates included in the mapping table according to the mapping relationship included in the mapping table, and determine the target desorption flow rate as the desorption flow rate; Adjust the carbon canister solenoid valve according to the set duty cycle so that the carbon canister performs desorption operation according to the desorption flow rate.

2. The desorption control method as described in claim 1, characterized in that, The evaporative adsorption control system further includes an engine, and the step of determining the desorption flow rate corresponding to the evaporative adsorption control system includes: Obtain the engine speed and oil pressure values ​​corresponding to the engine; The desorption capacity value of the active oil-gas separator is determined based on the engine speed, the oil pressure value, and the real-time crankcase pressure value, and the desorption flow rate of the evaporative adsorption control system is determined based on the desorption capacity value.

3. The desorption control method as described in claim 1, characterized in that, The evaporation adsorption control system also includes a first pressure sensor and a second pressure sensor, wherein the first pressure sensor is located in the upstream pipeline of the carbon canister and the second pressure sensor is located in the downstream pipeline of the carbon canister. The step of determining the real-time pressure ratio corresponding to the carbon canister includes: The real-time upstream pressure value corresponding to the carbon canister is determined by the first pressure sensor, and the real-time downstream pressure value corresponding to the carbon canister is determined by the second pressure sensor. The real-time pressure ratio corresponding to the carbon canister is determined based on the real-time upstream pressure value and the real-time downstream pressure value.

4. The desorption control method as described in claim 1, characterized in that, The step of determining the set duty cycle corresponding to the carbon canister solenoid valve based on the desorption flow rate includes: The target desorption flow is determined by querying the mapping table based on the desorption flow; Based on the mapping relationship, a target duty cycle corresponding to the target desorption flow rate is determined from the standard duty cycles included in the mapping table, and the target duty cycle is determined as the set duty cycle corresponding to the carbon canister solenoid valve.

5. The desorption control method as described in claim 1, characterized in that, Prior to the step of controlling the active oil-gas separator to perform oil-gas extraction operation on the crankcase, the method further includes: Obtain the real-time carbon canister pressure value corresponding to the carbon canister, determine the fuel storage capacity corresponding to the carbon canister based on the real-time carbon canister pressure value, and compare the fuel storage capacity with a preset storage threshold to obtain a first comparison result; Obtain the engine coolant temperature corresponding to the engine, and compare the engine coolant temperature with a preset temperature threshold to obtain a second comparison result; If the first comparison result indicates that the fuel storage has reached the storage threshold, and the second comparison result indicates that the engine coolant temperature has reached the temperature threshold, then the step of controlling the active oil-gas separator to perform oil-gas extraction operation on the crankcase is executed.

6. The desorption control method as described in claim 1, characterized in that, Prior to the step of controlling the active oil-gas separator to perform oil-gas extraction operation on the crankcase, the method further includes: Obtain the preset standard desorption flow rate, the standard duty cycle corresponding to each standard desorption flow rate, and the standard pressure ratio corresponding to each standard desorption flow rate; Determine the mapping relationship between each of the standard desorption flow rates, each of the standard desorption flow rates, and each of the standard pressure ratios, and construct a mapping table based on the mapping relationship, each of the standard desorption flow rates, each of the standard duty cycles, and each of the standard pressure ratios.

7. A desorption control device, characterized in that, The desorption control device is applied to the evaporative adsorption control system, which includes an active oil-gas separator, a crankcase, a carbon canister solenoid valve, and a carbon canister. The device includes: The pressure detection module is used to control the active oil-gas separator to perform oil-gas extraction operation on the crankcase and to obtain the real-time crankcase pressure value corresponding to the crankcase. The duty cycle calculation module is used to determine the desorption flow rate corresponding to the evaporative adsorption control system if the real-time crankcase pressure value is negative, and to determine the set duty cycle corresponding to the carbon canister solenoid valve based on the desorption flow rate. The step of determining the desorption flow rate corresponding to the evaporative adsorption control system includes: Obtain a preset mapping table and determine the real-time pressure ratio corresponding to the carbon canister; query the mapping table based on the real-time pressure ratio to determine a target pressure ratio that matches the real-time pressure ratio from among the standard pressure ratios included in the mapping table; determine the target desorption flow rate corresponding to the target pressure ratio from among the standard desorption flow rates included in the mapping table according to the mapping relationship included in the mapping table, and determine the target desorption flow rate as the desorption flow rate; The desorption execution module is used to adjust the carbon canister solenoid valve according to the set duty cycle, so that the carbon canister performs the desorption operation according to the desorption flow rate.

8. A terminal device, characterized in that, The terminal device includes: a memory, a processor, and a desorption control program stored in the memory and executable on the processor, wherein the desorption control program, when executed by the processor, implements the steps of the desorption control method as described in any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a desorption control program, which, when executed by a processor, implements the steps of the desorption control method as described in any one of claims 1 to 6.

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