A carbon canister desorption system and a control method thereof

Abstract

The application provides a carbon tank desorption system and a control method thereof, and relates to the field of automobile carbon tank desorption. The desorption system comprises a carbon tank, an engine, an exhaust pipe, a combustion device and a first pumping device. The carbon tank has mixed gas inside. The engine is communicated with the carbon tank. The exhaust pipe is communicated with the engine and is used for discharging the gas combusted by the engine. The combustion device has a containing cavity used for combusting the mixed gas. The first pumping device is used for conveying the mixed gas from the carbon tank to the containing cavity. The venturi valve comprises a suction end, an output end and a driving end. The suction end is communicated with the carbon tank. The output end is communicated with the combustion device. The driving end is communicated with the exhaust pipe. By arranging the venturi valve, the gas in the exhaust pipe is used for power driving, and the energy consumption can be effectively reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of automobile carbon canister desorption, and in particular to a carbon canister desorption system and a control method thereof. BACKGROUND

[0002] For a hybrid vehicle, power switching is performed between an engine and a power battery, and there is a problem of low desorption efficiency and untimely desorption. For example, when the engine is not started, fuel in the fuel tank is also evaporated to generate mixed gas, and the mixed gas that is not desorbed is stored in the fuel tank, causing the pressure in the fuel tank to rise. If the mixed gas is not desorbed in time, the fuel tank may be deformed for a long time, and the fuel gauge may not display accurately. For example, the vehicle travels by relying on the power battery, and the engine needs to be frequently started to transport the mixed gas stored in the carbon canister to the engine for combustion and desorption. Frequent starting of the engine reduces the desorption efficiency and causes energy loss. SUMMARY

[0003] The present application provides a carbon canister desorption system and a control method thereof to improve the combustion desorption efficiency of the carbon canister while reducing energy consumption.

[0004] The present application provides a carbon canister desorption system, which comprises: a carbon canister having mixed gas inside; an engine in communication with the carbon canister; an exhaust pipe in communication with the engine and used for discharging gas combusted by the engine; a combustion device having a containing cavity for combusting the mixed gas; a first pumping device for transporting the mixed gas from the carbon canister to the containing cavity; and a venturi valve comprising a suction end, an output end, and a driving end, wherein the suction end is in communication with the carbon canister, the output end is in communication with the combustion device, and the driving end is in communication with the exhaust pipe.

[0005] Further, the first pumping device is connected to the carbon canister and the combustion device, respectively.

[0006] Further, the desorption system further comprises a second pumping device, and the second pumping device is connected to the driving end and the exhaust pipe, respectively.

[0007] Further, the desorption system further comprises a circulation pipeline, and the circulation pipeline comprises: a first pipeline having a first position connecting the driving end and the exhaust pipe; and a second pipeline having a second position connecting the output end and the exhaust pipe; wherein, along the extension direction of the exhaust pipe, the second position is located between the engine and the first position.

[0008] Further, the circulation pipeline further comprises a third pipeline, and the third pipeline connects the driving end and the first position of the exhaust pipe, and the first pumping device is located in the third pipeline.

[0009] The application further provides a control method of a carbon can desorption system, which is suitable for controlling the above-mentioned desorption system, and the desorption system further comprises a carbon can sensor, and the control method comprises the following steps: obtaining the hydrocarbon concentration in the carbon can through the carbon can sensor; obtaining the gas flow of the driving end; when the gas flow of the driving end is lower than a flow threshold value and the hydrocarbon concentration in the carbon can is greater than a preset threshold value, controlling the first gas pumping device to pump the mixed gas to the containing cavity and controlling the combustion device to make the mixed gas burn in the containing cavity.

[0010] Further, the desorption system further comprises a throttle valve, which is located between the venturi valve and the exhaust pipe; when the gas flow of the driving end is lower than a flow threshold value and the hydrocarbon concentration in the carbon can is greater than a preset threshold value, controlling the first gas pumping device to pump the mixed gas to the containing cavity and controlling the combustion device to make the mixed gas burn in the containing cavity comprises the following steps: when the gas flow of the driving end is lower than a flow threshold value and the hydrocarbon concentration in the carbon can is greater than a preset threshold value, controlling the throttle valve to increase the proportion of the gas flowing into the driving end in the exhaust gas of the engine until the gas flow of the driving end is not lower than a flow threshold value; when the opening degree of the throttle valve reaches a maximum value and the gas flow of the driving end is lower than a flow threshold value, controlling the first gas pumping device to pump the mixed gas to the containing cavity and controlling the combustion device to make the mixed gas burn in the containing cavity.

[0011] Further, the desorption system further comprises a second gas pumping device, which is connected with the driving end and the exhaust pipe respectively; the first gas pumping device is connected with the carbon can and the combustion device respectively; when the gas flow of the driving end is lower than a flow threshold value and the hydrocarbon concentration in the carbon can is greater than a preset threshold value, controlling the first gas pumping device to pump the mixed gas to the containing cavity and controlling the combustion device to make the mixed gas burn in the containing cavity comprises the following steps: when the gas flow of the driving end is lower than a flow threshold value and the hydrocarbon concentration in the carbon can is greater than a preset threshold value, controlling the second gas pumping device to pump the mixed gas to the containing cavity; when the duration of pumping the mixed gas to the containing cavity by the second gas pumping device exceeds a time threshold value and the hydrocarbon concentration in the carbon can is greater than a preset threshold value, controlling the first gas pumping device to pump the mixed gas to the containing cavity and controlling the combustion device to make the mixed gas burn in the containing cavity.

[0012] Further, the desorption system further comprises a flow sensor, which is located at the driving end; the step of obtaining the gas flow of the driving end comprises the following step: obtaining the gas flow of the driving end through the flow sensor.

[0013] Further, the obtaining the gas flow of the driving end comprises: obtaining a gas emission amount of the engine; confirming an opening degree of the throttle valve; and determining the gas flow of the driving end based on the gas emission amount of the engine and the opening degree of the throttle valve.

[0014] The embodiment of the present application provides a carbon tank desorption system, which comprises a carbon tank, an engine, an exhaust pipe, a combustion device, a first pumping device and a venturi valve. The carbon tank has mixed gas inside; the engine is communicated with the carbon tank; the exhaust pipe is communicated with the engine and is used for discharging the gas combusted by the engine; the combustion device has a containing cavity used for combusting the mixed gas; the first pumping device is used for conveying the mixed gas from the carbon tank to the containing cavity; and the venturi valve comprises a suction end, an output end and a driving end, the suction end is communicated with the carbon tank, the output end is communicated with the combustion device, and the driving end is communicated with the exhaust pipe. For the running state of the engine, the combustion device is arranged, so that the desorption efficiency of the mixed gas in the carbon tank can be accelerated; for the shutdown state of the engine, the combustion device is arranged, so that when the mixed gas exceeds a threshold value, the engine does not need to be started for combustion desorption, and the first pumping device is directly used for conveying the mixed gas to the combustion device for combustion desorption, so that the energy consumption caused by the frequent start and stop of the engine can be effectively avoided; the gas generated by the combustion of the engine and the gas generated by the combustion of the combustion device are conveyed to the venturi valve through a pipeline as a power source of the venturi valve, the mixed gas in the carbon tank is conveyed to the combustion device for desorption by the venturi valve, and the gas generated by the engine and the combustion device is utilized, so that the energy consumption can be effectively reduced. The control method of the carbon tank desorption system is also provided based on the above carbon tank desorption system, when it is judged that the carbon hydrogen concentration in the carbon tank exceeds a threshold value and needs to be desorbed, the gas discharged by the exhaust pipe is used to drive the venturi valve to save energy, and when the gas flow flowing through the driving end cannot meet the demand of the venturi valve, the first pumping device is used for auxiliary pumping of the mixed gas, so that the energy consumption can be reduced to the maximum extent. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 A structural schematic diagram of the carbon tank desorption system provided by the embodiment of the present application is provided;

[0016] Figure 2 A structural schematic diagram of another carbon tank desorption system provided by the embodiment of the present application is provided;

[0017] Figure 3 A structural schematic diagram of another carbon tank desorption system provided by the embodiment of the present application is provided;

[0018] Figure 4 A structural schematic diagram of the combustion device desorption system in the desorption system provided by the embodiment of the present application is provided;

[0019] Figure 5Another structure schematic view of a carbon tank desorption system provided by the embodiment of the present application;

[0020] Figure 6 A flow chart of a control method of carbon tank desorption provided by the embodiment of the present application;

[0021] Figure 7 A flow chart of another control method of carbon tank desorption provided by the embodiment of the present application;

[0022] Figure 8 A flow chart of another control method of carbon tank desorption provided by the embodiment of the present application;

[0023] Figure 9 A flow chart of another control method of carbon tank desorption provided by the embodiment of the present application;

[0024] Figure 10 A flow chart of another control method of carbon tank desorption provided by the embodiment of the present application.

[0025] Explanation of reference signs

[0026] 1, desorption system; 10, carbon tank; 11, carbon tank control valve; 12, ash filter; 20, combustion device desorption system; 21, combustion device; 22, first pump gas device; 23, venturi valve; 231, suction end; 232, output end; 233, driving end; 24, electromagnetic valve; 25, one-way valve; 26, second pump gas device; 30, engine desorption system; 31, engine; 32, venturi tube; 33, high desorption pressure sensor; 34, carbon tank electromagnetic valve; 35, exhaust pipe; 36, exhaust treatment device; 40, oil tank; 50, pipeline; 60, three-way joint. DETAILED DESCRIPTION

[0027] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application.

[0028] In the specific embodiments, each specific technical feature described can be combined in any suitable manner without contradiction, for example, different embodiments and technical solutions can be formed by combining different specific technical features. In order to avoid unnecessary repetition, various possible combinations of each specific technical feature in the present application are not described again.

[0029] In the following description, the terms "first," "second," etc., are used merely to distinguish different objects and do not indicate that the objects have the sameness or relationship. It should be understood that the directional descriptions "above," "below," "outside," and "inside" refer to the orientation under normal use conditions, while "left" and "right" refer to the left and right directions shown in the corresponding diagrams, which may or may not be the left and right directions under normal use conditions.

[0030] It should be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus 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 apparatus. 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 apparatus that includes that element. The term "connection," unless otherwise specified, includes both direct and indirect connections.

[0031] In specific embodiments, this desorption system is applicable to any type of electric vehicle. For example, it can be applied to the combustion desorption of the air-fuel mixture in hybrid electric vehicles; for example, it can be applied to the combustion desorption of the air-fuel mixture in plug-in hybrid electric vehicles; for example, it can be applied to the combustion desorption of the air-fuel mixture in range-extended hybrid electric vehicles. This desorption system is also applicable to electric vehicles of different specifications. For example, it can be applied to the combustion desorption of the air-fuel mixture in hybrid commercial buses; for example, it can be applied to the combustion desorption of the air-fuel mixture in hybrid passenger cars. The control method is the same as the control method described above. For ease of explanation, the following description uses the application of this desorption system to a passenger plug-in hybrid electric vehicle as an example.

[0032] In some embodiments, such as Figure 1 and Figure 2 As shown, the desorption system 1 includes: a carbon canister 10, a combustion device desorption system 20, an engine desorption system 30, a fuel tank 40, and a pipeline 50.

[0033] The carbon canister 10 contains a gas mixture; specifically, the fuel in the fuel tank 40 is volatile, and direct evaporation of fuel into the atmosphere would cause air pollution. A carbon canister 10 is installed between the car's engine 31 and the fuel tank 40. Fuel vapor from the fuel tank 40 enters the carbon canister 10 for storage through pipe 50. It should be noted that... Figures 1 to 5In the accompanying drawings, the lines connecting the devices represent pipes 50, and the arrows indicate the direction of gas mixture flow. The carbon canister 10 can be understood as a device for collecting and reusing the gas mixture; its specific structure can be determined according to actual needs. The gas mixture can be understood as fuel vapor. The proportion of fuel vapor in the carbon canister 10 can be obtained by detecting the hydrocarbon concentration. Using a medium in the carbon canister 10, such as activated carbon, the gas mixture volatilized from the fuel tank 40 is absorbed and stored; this process is called adsorption. The gas mixture stored in the carbon canister 10 is then transported to the appropriate location for combustion; this process is called desorption. For example, combustion desorption can occur through engine 31; combustion desorption can occur through combustion device 21; or combustion desorption can occur simultaneously through engine 31 and combustion device 21. The gas is then discharged through exhaust pipe 35 and engine exhaust treatment device 36, which includes a catalytic converter and a particulate filter.

[0034] Combustion desorption is performed via engine 31 through engine desorption system 30, with engine 31 connected to carbon canister 10; exhaust pipe 35 is connected to engine 31 and is used to discharge the combustion gases from engine 31; specifically, the gas mixture in carbon canister 10 can directly enter engine 31 for combustion desorption via carbon canister solenoid valve 34, or it can enter engine 31 for combustion desorption via venturi tube 32 through carbon canister solenoid valve 34. For example,... Figure 1 As shown, for example, when the turbocharger starts, there is positive pressure in the intake manifold of engine 31. A venturi tube 32 and a high desorption pressure sensor 33 are installed between the carbon canister 10 and engine 31. The air-fuel mixture enters engine 31 through the venturi tube 32 via the carbon canister solenoid valve 34 for combustion desorption. Specifically, the carbon canister control valve 11 opens, and air enters the carbon canister 10 after passing through the ash filter 12 and the carbon canister control valve 11, cleaning the carbon canister 10. The cleaned air-fuel mixture then passes sequentially through the carbon canister solenoid valve 34, the high desorption pressure sensor 33, and the venturi tube 32 before finally entering engine 31 for combustion desorption (e.g., ...). Figure 1 (As indicated by the solid arrow in the middle), the gas is then discharged through the exhaust pipe 35 and the exhaust gas treatment device 36. For example, when the turbocharger is not running, the intake manifold of the engine 31 is under negative pressure. The gas-fuel mixture stored in the carbon canister 10 is directly drawn into the engine 31 through the carbon canister solenoid valve 34 for combustion and desorption. Specifically, the carbon canister control valve 11 is opened, and air enters the carbon canister 10 after passing through the ash filter 12 and the carbon canister control valve 11 to clean the carbon canister 10. The cleaned gas-fuel mixture is then directly drawn into the engine 31 through the carbon canister solenoid valve 34 for combustion and desorption (as shown by the solid arrow in the middle). Figure 1 (in the direction indicated by the dashed arrow), and then the gas is discharged through the exhaust pipe 35 and the exhaust gas treatment device 36.

[0035] Combustion desorption is performed via combustion device 21 through combustion device desorption system 20. Combustion device 21 has a receiving cavity for combustion of the gas mixture. Specifically, when engine 31 is not started, the gas mixture in carbon canister 10 is delivered to combustion device 21 for combustion desorption. Combustion device 21 can be any device capable of combustion desorption of the gas mixture. Combustion device 21 has a receiving cavity, which can be understood as a cavity formed by combustion device 21, providing a place for combustion of the gas mixture. The receiving cavity can be a closed structure or an open structure, depending on the type of combustion device 21. For example, combustion device 21 generates high temperature by heating resistance wire, causing the gas mixture to encounter the high temperature and begin combustion. The receiving cavity can be an open structure, with the resistance wire continuously generating high temperature. The gas mixture continuously passes between the resistance wires in the receiving cavity, and the gas mixture continues to burn when it encounters the high temperature, thus performing combustion desorption of the gas mixture. For example, the combustion device 21 ignites the mixed gas by spark ignition, the spark is intermittent ignition, the containment cavity is a closed structure, the mixed gas is gathered in the containment cavity, and after being ignited by electric spark, all the mixed gas in the containment cavity is desorbed. Then the combusted gas is discharged, and the mixed gas in the carbon canister 10 is introduced into the containment cavity for the next combustion desorption.

[0036] The first pumping device 22 is used to deliver the gas mixture from the carbon canister 10 to the receiving cavity. The Venturi valve 23 includes an intake end 231, an output end 232, and a drive end 233. The intake end 231 is connected to the carbon canister 10, the output end 232 is connected to the combustion device 21, and the drive end 233 is connected to the exhaust pipe 35. Specifically, the gas mixture in the carbon canister 10 needs to be delivered to the combustion device 21 under pressure. Any device capable of delivering the gas mixture from the carbon canister 10 to the combustion device 21 is suitable. For example, such as... Figure 1 As shown, the first pumping device 22 is an air pump, which directly delivers the mixed gas to the combustion device 21. Its specific structure will be described in detail below, for example, as... Figure 2 As shown, the first pumping device 22 is an air pump, which is connected to the drive end 233 of the Venturi valve 23. The Venturi effect of the Venturi valve 23 creates a negative pressure, allowing the mixed gas in the carbon canister 10 to enter the combustion device 21 through the Venturi valve 23. The specific structure will be described in detail below. To prevent backflow of the mixed gas in the receiving cavity, a one-way valve 25 is installed between the carbon canister 10 and the combustion device 21. The mixed gas can only be transported from the carbon canister 10 to the receiving cavity. The specific location of the one-way valve 25 is not limited. For example, the one-way valve 25 can be located between the Venturi valve and the combustion device 21.

[0037] like Figure 1As shown, the carbon canister 10 can be connected to the combustion device desorption system 20 and the engine desorption system 30 via pipes 50. For hybrid vehicles, the mixture desorption may switch between engine desorption and combustion device desorption modes. To prevent the mixture from entering the combustion device 21 during engine combustion desorption, the combustion device desorption system 20 also includes a solenoid valve 24. The solenoid valve 24 is located between the carbon canister 10 and the combustion device 21, and its specific location is not limited. For example, the solenoid valve 24 may be located between the first pumping device 22 and the combustion device 21; or between the first pumping device 22 and the carbon canister 10. The solenoid valve 24 controls the opening and closing of the passage between the carbon canister 10 and the combustion device 21. To save space and facilitate the connection of the carbon canister 10 with the combustion device desorption system 20 and the engine desorption system 30, the desorption system 1 also includes a three-way connector 60. The inlet end of the three-way connector 60 is connected to the carbon canister 10, and the two outlet ends of the three-way connector 60 are connected to the combustion device desorption system 20 and the engine desorption system 30, respectively.

[0038] This invention provides a carbon canister desorption system, comprising: a carbon canister, an engine, an exhaust pipe, a combustion device, a first pumping device, and a venturi valve. The carbon canister contains a gas mixture; the engine is connected to the carbon canister; the exhaust pipe is connected to the engine and is used to discharge combustion gases from the engine; the combustion device has a cavity for burning the gas mixture; the first pumping device is used to transport the gas mixture from the carbon canister to the cavity; the venturi valve includes an intake end, an output end, and a drive end, the intake end being connected to the carbon canister, the output end being connected to the combustion device, and the drive end being connected to the exhaust pipe. For engine operation, the combustion device accelerates the desorption efficiency of the gas mixture in the canister. For engine shutdown, the combustion device allows for combustion desorption without starting the engine when the gas mixture exceeds a threshold. The first pump directly delivers the gas mixture to the combustion device for combustion desorption, effectively avoiding energy consumption caused by frequent engine start-stop cycles. Simultaneously, the gases produced by engine and combustion device combustion are piped to a Venturi valve, serving as its power source. The Venturi valve then delivers the gas mixture from the canister to the combustion device for desorption. Utilizing the gases produced by the engine and combustion device effectively reduces energy consumption. Based on this canister desorption system, a control method is also provided. When the hydrocarbon concentration in the canister exceeds a threshold requiring desorption, exhaust gas drives the Venturi valve to save energy. If the gas flow through the drive end is insufficient for the Venturi valve, the first pump assists in pumping the gas mixture, further minimizing energy consumption.

[0039] In some embodiments, such as Figure 2As shown, the first pumping device 22 is connected to both the carbon canister 10 and the combustion device 21. Specifically, to increase the desorption efficiency of the combustion device 21, the combustion device desorption system 20 has two channels. Both channels can be opened to improve desorption efficiency when needed. The first channel allows the mixed gas in the carbon canister 10 to enter the combustion device 21 through the first pumping device 22. The second channel allows the mixed gas in the carbon canister 10 to enter the combustion device 21 through the Venturi valve 23. The drive end 233 of the Venturi valve 23 can be connected to the exhaust pipe 35. The gas discharged from the exhaust pipe 35 can also be used to directly draw in air by adding a pumping device. To prevent the mixed gas in the receiving cavity from flowing back, a one-way valve 25 is provided between the carbon canister 10 and the combustion device 21. The mixed gas can only be delivered from the carbon canister 10 to the receiving cavity. The specific location of the one-way valve 25 is not limited. For example, the one-way valve 25 can be located between the first pumping device 22 and the combustion device 21; or, for example, a one-way valve 25 can also be located between the Venturi valve 23 and the combustion device 21. The specific process is as follows: the carbon canister control valve 11 is opened, and the air enters the carbon canister 10 after passing through the ash filter 12 and the carbon canister control valve 11 to clean the carbon canister 10. After cleaning, part of the mixed gas is transported to the combustion device 21 for combustion and desorption under the action of the first air pump device 22, and part of the mixed gas enters the combustion device through the Venturi valve 23.

[0040] In some embodiments, such as Figure 3 As shown, the desorption system 1 also includes a second air pumping device 26, which is connected to the drive end 233 and the exhaust pipe 35 respectively.

[0041] Specifically, in order to reduce energy consumption, the gas discharged from the exhaust pipe 35 is connected to the drive end 233. At the same time, in order to ensure that the gas discharged from the exhaust pipe 35 is sufficient to generate negative pressure in the Venturi valve 23, the desorption system 1 also includes a second pumping device 26. The second pumping device 26 is connected to the drive end 233 and the exhaust pipe 35 respectively. The second pumping device 26 allows more gas in the exhaust pipe 35 to enter the drive end 233, thereby accelerating the speed at which the Venturi valve 23 draws in the mixed gas.

[0042] In some embodiments, such as Figure 4As shown, the desorption system 1 also includes a circulation pipeline, which includes: a first pipeline having a first position connecting the drive end 233 and the exhaust pipe 35; and a second pipeline having a second position connecting the output end 232 and the exhaust pipe 35; wherein, along the extension direction of the exhaust pipe 35, the second position is located between the engine 31 and the first position. Specifically, in order to further reuse the gas after combustion in the combustion device 21 as a power source, the gas after combustion in the combustion device 21 is connected to the exhaust pipe 35 of the engine 31, so that the gas after combustion in the combustion device 21 flows into the exhaust pipe 35, thereby introducing at least a portion of the gas into the venturi valve 23 through the exhaust pipe 35. The first pipeline can be understood as the pipeline section from the exhaust pipe 35 to the drive end 233 of the Venturi valve 23. The connection position between the first pipeline and the exhaust pipe 35 is the first position. The second pipeline can be understood as the pipeline section from the output end 232 of the Venturi valve 23 to the exhaust pipe 35. The pipeline includes the combustion device 21. The connection position between the second pipeline and the exhaust pipe 35 is the second position. The first pipeline, the second pipeline, the Venturi valve 23, and the exhaust pipe 35 form a circulation pipeline. It should be noted that in order to ensure that the gas after combustion by the combustion device 21 can re-enter the Venturi valve 23 along the extension direction of the exhaust pipe 35, the second position is located between the engine 31 and the first position.

[0043] In some embodiments, such as Figure 5 As shown, the circulation pipeline also includes a third pipeline, which connects the drive end 233 and the first position of the exhaust pipe 35. The first pumping device 22 is located in the third pipeline. Specifically, in order to further improve the desorption efficiency and ensure that the Venturi valve 23 can generate sufficient negative pressure, the circulation pipeline also includes a third pipeline, which can be understood as a pipeline connected in parallel with the first pipeline. The third pipeline contains the first pumping device 22, which is connected to the drive end 233 and the exhaust pipe 35 respectively. The first pumping device 22 causes more gas in the exhaust pipe 35 to enter the drive end 233, thereby accelerating the speed at which the Venturi valve 23 draws in the mixed gas.

[0044] This embodiment provides a control method for a carbon canister desorption system, which is applicable to systems such as... Figures 1 to 5 The desorption system shown in any of the images. Please refer to [the image]. Figure 6 , Figure 6 This is a schematic flowchart of a carbon canister desorption control method provided in an embodiment of the present invention, as shown below. Figure 6 As shown, the flow of this control method includes:

[0045] Step S1: Obtain the hydrocarbon concentration inside the carbon canister using a carbon canister sensor.

[0046] Specifically, a carbon canister sensor is installed inside the carbon canister. The carbon canister sensor can obtain the hydrocarbon concentration inside the carbon canister in real time. There are no restrictions on the specific location and number of carbon canister sensors, as long as they can detect the hydrocarbon concentration inside the carbon canister. To improve the detection accuracy, the number of carbon canister sensors can be increased.

[0047] Step S2: Obtain the gas flow rate at the drive end.

[0048] Specifically, the control system needs to obtain the gas flow rate at the drive end of the Venturi valve. The specific method of obtaining the flow rate is not limited. For example, a flow sensor can be set near the drive end to directly obtain the gas flow rate at the drive end.

[0049] Step S3: When the gas flow rate at the drive end is lower than the flow rate threshold and the hydrocarbon concentration in the carbon canister is higher than the preset threshold, control the first gas pumping device to pump the mixed gas into the receiving cavity, and control the combustion device to make the mixed gas burn in the receiving cavity.

[0050] Specifically, if the gas flow rate at the drive end is lower than the flow rate threshold, which can be understood as the minimum threshold required to drive the Venturi valve to form a negative pressure, then the gas flow rate cannot drive the Venturi valve to form a negative pressure, and the mixed gas cannot be delivered to the combustion device through the Venturi valve. If the hydrocarbon concentration in the carbon canister is higher than a preset threshold, the mixed gas needs to be desorbed by the combustion device. The specific threshold value can be determined according to actual needs and is not limited here. The control system opens the carbon canister control valve, and air enters the carbon canister after passing through the ash filter and the carbon canister control valve to clean the carbon canister. Under the action of the first pumping device, the mixed gas in the carbon canister is pumped to the receiving chamber. To prevent the mixed gas in the receiving chamber from flowing back, a one-way valve and a solenoid valve are installed between the carbon canister and the combustion device. The mixed gas can only be delivered from the carbon canister to the receiving chamber. The control system controls the combustion device to make the mixed gas burn within the receiving chamber. It is important to emphasize that the gas-fuel mixture in the carbon canister is pumped into the receiving chamber by the first pumping device. The location of the first pumping device does not affect the delivery of the gas-fuel mixture. For example, the first pumping device can directly pump the gas-fuel mixture from the carbon canister into the receiving chamber, or it can drive the Venturi valve to generate negative pressure, delivering the gas-fuel mixture from the carbon canister to the combustion device through the Venturi valve. The first pumping device driving the Venturi valve to generate negative pressure includes two scenarios: first, the first pumping device directly pumps in air, which drives the Venturi valve to generate negative pressure; second, the first pumping device pumps in exhaust gas, which drives the Venturi valve to generate negative pressure. It should be noted that when the hydrocarbon concentration in the carbon canister is not greater than a preset threshold, the vehicle control does not require any adjustments and continues to operate in its original state. It should be noted that when the engine is in operation and the hydrocarbon concentration in the carbon canister is greater than the preset threshold, the control system can either close or open the solenoid valve connecting the carbon canister to the combustion device. Opening the carbon canister solenoid valve connecting the carbon canister to the engine allows the air-fuel mixture to enter the engine from the carbon canister for combustion and desorption, and then be discharged through the exhaust pipe and exhaust gas treatment device.

[0051] In some embodiments, such as Figure 7 As shown, Figure 7 This is a flowchart illustrating a control method for another carbon canister desorption system, which is similar to... Figure 6 The desorption methods provided are different. Figure 7 In step S3, when the gas flow rate at the drive end is lower than the flow threshold and the hydrocarbon concentration in the carbon canister is higher than the preset threshold, controlling the first pumping device to pump the mixed gas into the receiving cavity and controlling the combustion device to burn the mixed gas in the receiving cavity includes:

[0052] Step S31: When the gas flow rate at the drive end is lower than the flow rate threshold and the hydrocarbon concentration in the carbon canister is higher than the preset threshold, control the throttle valve to increase the proportion of the exhaust gas from the engine flowing into the drive end until the gas flow rate at the drive end is not lower than the flow rate threshold.

[0053] Specifically, the desorption system also includes a throttle valve, located between the Venturi valve and the exhaust pipe. When the hydrocarbon concentration in the carbon canister is greater than a preset threshold, the combustion device is needed to desorb the gas mixture. If the gas flow rate at the drive end is lower than the flow rate threshold, the Venturi valve cannot generate negative pressure to deliver the gas mixture from the carbon canister to the combustion device for combustion and desorption. By controlling the throttle valve, the proportion of exhaust gas flowing into the drive end is increased, thus allowing more exhaust gas to flow into the drive end until the gas flow rate at the drive end is not lower than the flow rate threshold. This allows the Venturi valve to generate negative pressure, enabling the gas mixture from the carbon canister to be delivered to the combustion device for combustion and desorption.

[0054] Step S32: When the throttle valve opening reaches its maximum value and the gas flow rate at the drive end is lower than the flow rate threshold, control the first gas pumping device to pump the mixed gas into the receiving cavity, and control the combustion device to make the mixed gas burn in the receiving cavity.

[0055] Specifically, when the throttle valve opening reaches its maximum value and the gas flow rate at the drive end is lower than the flow threshold, it indicates that an auxiliary device is needed to increase the gas flow rate. The control system controls the first pumping device to pump the mixed gas into the receiving chamber and controls the combustion device to burn the mixed gas within the receiving chamber. It is important to emphasize that the mixed gas in the carbon canister is pumped into the receiving chamber by the first pumping device. The location of the first pumping device does not affect the delivery of the mixed gas, as described in detail above, and will not be repeated here.

[0056] In some embodiments, such as Figure 8 As shown, Figure 8 This is a flowchart illustrating a control method for another carbon canister desorption system, which is similar to... Figure 6 The desorption methods provided are different. Figure 8 In step S3, when the gas flow rate at the drive end is lower than the flow threshold and the hydrocarbon concentration in the carbon canister is higher than the preset threshold, controlling the first pumping device to pump the mixed gas into the receiving cavity and controlling the combustion device to burn the mixed gas in the receiving cavity includes:

[0057] Step S33: When the gas flow rate at the drive end is lower than the flow rate threshold and the hydrocarbon concentration in the carbon canister is higher than the preset threshold, control the second pumping device to pump the mixed gas into the receiving cavity.

[0058] Specifically, the desorption system also includes a second gas pumping device, which is connected to the drive end and the exhaust pipe respectively; the first gas pumping device is connected to the carbon canister and the combustion device respectively; when the gas flow rate at the drive end is lower than the flow rate threshold and the hydrocarbon concentration in the carbon canister is higher than the preset threshold, the mixed gas needs to be desorbed by the combustion device. The control system controls the second gas pumping device to open, drawing gas and air from the exhaust pipe into the pump venturi valve.

[0059] Step S34: When the duration of the second pumping device pumping the mixed gas into the containment cavity exceeds the time threshold and the hydrocarbon concentration in the carbon canister is greater than the preset threshold, the first pumping device is controlled to pump the mixed gas into the containment cavity, and the combustion device is controlled to make the mixed gas burn in the containment cavity.

[0060] Specifically, the time threshold is not limited and can be determined according to the actual situation. When the duration of the second pumping device pumping the mixed gas into the containment chamber exceeds the time threshold and the hydrocarbon concentration in the carbon canister is greater than the preset threshold, the specific time threshold is not limited and can be determined according to the actual situation. This indicates that relying solely on the Venturi valve is insufficient to meet the requirements of efficient desorption. The control system controls the first pumping device to open, directly pumping the mixed gas in the carbon canister into the combustion device, and controls the combustion device to make the mixed gas burn in the containment chamber.

[0061] In some embodiments, such as Figure 9 As shown, Figure 9 This is a flowchart illustrating a control method for another carbon canister desorption system, which is similar to... Figure 6 The desorption methods provided are different. Figure 6 Step S2 in the process includes obtaining the gas flow rate at the drive end, which includes:

[0062] Step S22: Obtain the gas flow rate at the drive end through the flow sensor.

[0063] Specifically, in order to facilitate the rapid acquisition of gas flow at the drive end, the desorption system also includes a flow sensor located at the drive end. The flow sensor control system can directly acquire the gas flow at the drive end through the flow sensor.

[0064] In some embodiments, such as Figure 10 As shown, Figure 10 This is a flowchart illustrating a control method for another carbon canister desorption system, which is similar to... Figure 7 The desorption methods provided are different. Figure 7 Step S2 in the process includes obtaining the gas flow rate at the drive end, which includes:

[0065] Step S22: Obtain the engine's gas emissions.

[0066] Specifically, the control system obtains the engine's gas emissions. There are various indicators for obtaining the engine's gas emissions, and any form that can obtain the engine's gas emissions meets the requirements of this period. For example, the engine's gas emissions can be determined by the engine's intake air volume.

[0067] Step S23: Confirm the opening degree of the throttle valve.

[0068] Specifically, after obtaining the engine's gas emissions, the control system confirms the throttle valve opening.

[0069] Step S24: Determine the gas flow rate at the drive end based on the engine's gas emission and the throttle valve opening.

[0070] Specifically, after obtaining the engine's gas emission and confirming the throttle valve opening, the control system can calculate the gas flow rate at the drive end by using the engine's gas emission and the throttle valve opening.

[0071] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention.

Claims

1. A control method for a carbon canister desorption system, characterized in that, The control method is used to control a desorption system, which includes a carbon canister containing a gas mixture; an engine connected to the carbon canister; an exhaust pipe connected to the engine for discharging combustion gases from the engine; a combustion device having a cavity for burning the gas mixture; a first pumping device for delivering the gas mixture from the carbon canister to the cavity; and a Venturi valve including an intake end, an output end, and a drive end, wherein the intake end is connected to the carbon canister, the output end is connected to the combustion device, and the drive end is connected to the exhaust pipe. The desorption system also includes a carbon canister sensor. The control method includes: obtaining the hydrocarbon concentration in the carbon canister through the carbon canister sensor; obtaining the gas flow rate at the drive end; and, when the gas flow rate at the drive end is lower than the flow rate threshold and the hydrocarbon concentration in the carbon canister is greater than a preset threshold, controlling the first pumping device to pump the mixed gas into the receiving cavity, and controlling the combustion device to burn the mixed gas in the receiving cavity.

2. The control method according to claim 1, characterized in that, The first pumping device is connected to both the carbon canister and the combustion device.

3. The control method according to claim 2, characterized in that, The desorption system further includes a second air pumping device, which is connected to the drive end and the exhaust pipe respectively.

4. The control method according to claim 1, characterized in that, The desorption system further includes a circulation pipeline, which comprises: The first pipeline has a first position connecting the drive end and the exhaust pipe; The second pipeline has a second position connecting the output end and the exhaust pipe; Wherein, along the extension direction of the exhaust pipe, the second position is located between the engine and the first position.

5. The control method according to claim 4, characterized in that, The circulation pipeline also includes a third pipeline, which connects the drive end to the first position of the exhaust pipe, and the first pumping device is located in the third pipeline.

6. The control method according to claim 1, characterized in that, The desorption system also includes a throttle valve located between the Venturi valve and the exhaust pipe; When the gas flow rate at the drive end is lower than a flow threshold and the hydrocarbon concentration in the carbon canister is greater than a preset threshold, controlling the first pumping device to pump the mixed gas into the receiving cavity and controlling the combustion device to burn the mixed gas in the receiving cavity includes: When the gas flow rate at the drive end is lower than the flow rate threshold and the hydrocarbon concentration in the carbon canister is greater than the preset threshold, the throttle valve is controlled to increase the proportion of the exhaust gas from the engine flowing into the drive end until the gas flow rate at the drive end is not lower than the flow rate threshold. When the throttle valve opening reaches its maximum value and the gas flow rate at the drive end is lower than the flow rate threshold, the first pumping device is controlled to pump the mixed gas into the receiving cavity, and the combustion device is controlled to make the mixed gas burn in the receiving cavity.

7. The control method according to claim 1, characterized in that, The desorption system further includes a second pumping device, which is connected to the drive end and the exhaust pipe respectively; the first pumping device is connected to the carbon canister and the combustion device respectively. When the gas flow rate at the drive end is lower than a flow threshold and the hydrocarbon concentration in the carbon canister is greater than a preset threshold, controlling the first pumping device to pump the mixed gas into the receiving cavity and controlling the combustion device to burn the mixed gas in the receiving cavity includes: When the gas flow rate at the drive end is lower than the flow rate threshold and the hydrocarbon concentration in the carbon canister is greater than the preset threshold, the second pumping device is controlled to pump the mixed gas into the receiving cavity. When the duration of the second pumping device pumping the mixed gas into the containment cavity exceeds a time threshold and the hydrocarbon concentration in the carbon canister is greater than a preset threshold, the first pumping device is controlled to pump the mixed gas into the containment cavity, and the combustion device is controlled to burn the mixed gas in the containment cavity.

8. The control method according to any one of claims 1 to 7, characterized in that, The desorption system also includes a flow sensor located at the drive end; The process of obtaining the gas flow rate at the drive end includes: The gas flow rate at the drive end is obtained through the flow sensor.

9. The control method according to claim 6, characterized in that, The process of obtaining the gas flow rate at the drive end includes: Obtain the gas emissions of the engine; Confirm the opening degree of the throttle valve; The gas flow rate at the drive end is determined based on the engine's gas emission rate and the throttle valve's opening degree.

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