CN116085124A - Adsorption and desorption control system and control method for light automobile carbon tank - Google Patents
Adsorption and desorption control system and control method for light automobile carbon tank Download PDFInfo
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- CN116085124A CN116085124A CN202310114624.5A CN202310114624A CN116085124A CN 116085124 A CN116085124 A CN 116085124A CN 202310114624 A CN202310114624 A CN 202310114624A CN 116085124 A CN116085124 A CN 116085124A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/003—Adding fuel vapours, e.g. drawn from engine fuel reservoir
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
- F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
- F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
- F02M2025/0845—Electromagnetic valves
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Supplying Secondary Fuel Or The Like To Fuel, Air Or Fuel-Air Mixtures (AREA)
Abstract
The invention discloses an adsorption and desorption control system of a carbon tank of a light automobile, which comprises an engine, an oil tank, the carbon tank, a first electromagnetic valve, a second electromagnetic valve and a third electromagnetic valve; the desorption port on the engine is communicated with one end of a first electromagnetic valve through a first connecting pipeline; an adsorption port on the oil tank is communicated with one end of a second electromagnetic valve through a second connecting pipeline; the adsorption and desorption integrated port on the carbon tank is communicated with one end of a third electromagnetic valve through a third connecting pipeline; the other end of the first electromagnetic valve, the other end of the second electromagnetic valve and the other end of the third electromagnetic valve are converged and intersected; the atmospheric port on the carbon tank is communicated with the external atmospheric environment; the oil tank is provided with an oil tank pressure sensor. The invention also discloses a control method of the adsorption and desorption control system of the light car carbon tank. The invention can effectively reduce the oil gas quality entering the carbon tank, avoid that the oil gas adsorption capacity in the carbon tank greatly exceeds the adsorption capacity of the carbon tank, and reduce the carbon and hydrogen emission of the whole vehicle.
Description
Technical Field
The invention relates to the technical field of emission control of pollutants of vehicles, in particular to an adsorption and desorption control system and a control method of a carbon tank of a light vehicle, which are used for emission control of evaporated pollutants of the light vehicle and emission control of hydrocarbon pollutants in the oiling process.
Background
Currently, the IV type test (evaporative pollutant emission test) and the VII type test (refueling pollutant emission test) specified in national standard document GB 18352.6-2016 light vehicle pollutant emission limit and measuring method (Chinese sixth stage) have limit requirements on hydrocarbon pollutant emission of the light vehicle. For vehicles less than 2500kg (i.e., light vehicles) it is required that the evaporative contaminants not exceed 0.7g/test, including vehicle hot dip hydrocarbon contaminants and diurnal exhaled hydrocarbon contaminant emissions. In addition, the emissions of fueling contaminants (i.e. hydrocarbon contaminants generated during fueling) are no more than 0.01g/L.
More than 60% of hydrocarbon pollutants come from a fuel system, oil gas generated by an oil tank in the fuel system enters a carbon tank of a vehicle through a pipeline and is temporarily absorbed by activated carbon in the carbon tank, after an engine of the vehicle reaches a desorption condition, a desorption valve (used for controlling a switch desorption port) on the carbon tank is opened, negative pressure at a throttle valve in the engine connected with the carbon tank enables external air to enter from an atmospheric port of the carbon tank, then the oil gas is carried to flow out from the desorption port of the carbon tank, and finally the oil gas enters the engine to be combusted. The adsorption-desorption process thus performed realizes control of hydrocarbon pollutant emission.
However, when the adsorption capacity of the carbon tank is large and exceeds the adsorption capacity of the carbon tank, the oil gas can escape from the atmospheric port of the carbon tank to the atmosphere, so that environmental pollution is generated.
In addition, with the use of the vehicle, the activated carbon in the carbon tank is continuously aged due to repeated adsorption-desorption of the oil gas, the capacity of adsorbing the oil gas is continuously reduced, and further the emission of hydrocarbon pollutants of the vehicle is continuously increased due to the aging of the carbon tank, so that the environment is polluted more greatly.
Disclosure of Invention
The invention aims at solving the technical defects existing in the prior art and provides an adsorption and desorption control system and a control method for a light car carbon tank.
The invention provides an adsorption and desorption control system of a carbon tank of a light automobile, which comprises an engine, an oil tank, the carbon tank, a first electromagnetic valve, a second electromagnetic valve and a third electromagnetic valve;
the desorption port on the engine is communicated with one end of the first electromagnetic valve through a hollow first connecting pipeline;
the adsorption port on the oil tank is communicated with one end of the second electromagnetic valve through a hollow second connecting pipeline;
the adsorption and desorption integrated port on the carbon tank is communicated with one end of a third electromagnetic valve through a hollow third connecting pipeline;
the other end of the first electromagnetic valve, the other end of the second electromagnetic valve and the other end of the third electromagnetic valve are converged and intersected together;
an atmospheric port on the carbon tank is communicated with the external atmospheric environment;
the oil tank is provided with an oil tank pressure sensor.
Preferably, the diameter of the second connecting line is greater than the diameter of the first connecting line.
Preferably, the diameter of the second connecting pipeline is 20-24mm, and the diameter of the first connecting pipeline is 16-20mm.
Preferably, the desorption port on the engine is arranged on a connecting pipeline between a throttle valve of the engine and a cylinder inner cavity of the engine.
Preferably, the oil tank pressure sensor is configured to detect the oil gas pressure in the oil tank in real time, and send a trigger closing control signal to the second electromagnetic valve when the oil gas pressure in the oil tank is lower than a preset pressure lower limit value, so that the second electromagnetic valve is closed, and send a trigger opening control signal to the second electromagnetic valve when the oil gas pressure in the oil tank is higher than a preset pressure upper limit value, so that the second electromagnetic valve is opened, so that the oil gas is released from the oil tank, and the oil gas pressure in the oil tank is reduced.
Preferably, the first solenoid valve, the second solenoid valve and the third solenoid valve are integrally provided together.
Preferably, the first solenoid valve, the second solenoid valve and the third solenoid valve are connected with an ECU on the vehicle;
and the ECU on the vehicle is used for controlling the opening and closing of the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve.
In addition, the invention also provides a control method of the adsorption and desorption control system of the light car carbon tank, which comprises the following steps:
step S1, acquiring the working state of an engine;
the working states of the engine comprise a non-starting state and a starting state;
step S2, when the engine is in a non-starting state, executing a preset first operation; executing a preset second operation when the engine is in a starting state;
the preset first operation and the preset second operation are used for reducing the oil gas quality entering the carbon tank and reducing the adsorption oil gas quality of the carbon tank.
Preferably, in step S2, a preset first operation specifically includes the following sub-steps:
step S211, acquiring the working state of a refueling switch;
the working states of the oiling switch comprise an opening state and a closing state;
step S212, when the oiling switch is in an open state, the second electromagnetic valve and the third electromagnetic valve are controlled to be opened, and the first electromagnetic valve is closed, so that oil gas in the oil tank is sequentially introduced into the carbon tank through the second electromagnetic valve and the third electromagnetic valve;
when the oiling switch is in a closed state, acquiring an oil gas pressure value in the oil tank through an oil tank pressure sensor arranged on the oil tank, and comparing the oil gas pressure value in the oil tank with a preset pressure upper limit value; if the oil gas pressure value in the oil tank is smaller than the preset pressure upper limit value, the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve are controlled to be closed, so that the oil gas quality entering the carbon tank is reduced, the adsorption oil gas quality of the carbon tank is reduced, otherwise, the second electromagnetic valve and the third electromagnetic valve are controlled to be opened, the first electromagnetic valve is closed, and the oil gas in the oil tank is led into the carbon tank.
Preferably, in step S2, a preset second operation specifically includes the following sub-steps:
step S221, executing preset corresponding operation according to whether the engine reaches the desorption condition or not;
wherein, if the engine does not reach the desorption condition, step S222 is performed, and if the desorption condition is reached, step S223 is performed;
step S222, acquiring an oil gas pressure value in the oil tank through an oil tank pressure sensor arranged on the oil tank, and comparing the oil gas pressure value in the oil tank with a preset pressure upper limit value;
if the oil gas pressure value in the oil tank is greater than or equal to the preset pressure upper limit value, controlling to open the second electromagnetic valve and the third electromagnetic valve, and closing the first electromagnetic valve, so that the oil gas in the oil tank is introduced into the carbon tank;
if the oil gas pressure value in the oil tank is smaller than the preset pressure upper limit value, the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve are controlled to be closed, so that the oil gas quality entering the carbon tank is reduced, and the adsorption oil gas quality of the carbon tank is reduced;
step S223, acquiring an oil gas pressure value in the oil tank through an oil tank pressure sensor arranged on the oil tank, and comparing the oil gas pressure value in the oil tank with a preset pressure upper limit value;
if the oil gas pressure value in the oil tank is smaller than the preset pressure upper limit value, controlling to open the first electromagnetic valve and the second electromagnetic valve and closing the third electromagnetic valve, so that the oil gas in the oil tank is introduced into the engine and is burnt and consumed by the engine, the quality of the oil gas entering the carbon tank is reduced, and the times of adsorption and desorption of the oil gas by the carbon tank are reduced;
if the oil gas pressure value in the oil tank is greater than or equal to the preset pressure upper limit value, the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve are controlled to be fully opened, so that the oil gas quality entering the carbon tank can be reduced, and the times of adsorption and desorption of the oil gas by the carbon tank are reduced.
Compared with the prior art, the adsorption and desorption control system and the control method for the light car carbon tank are scientific in design, can effectively reduce the quality of oil gas entering the carbon tank, avoid the adsorption capacity of the oil gas in the carbon tank to be greatly exceeding the adsorption capacity of the carbon tank, reduce the carbon and hydrogen emission of the whole car, and have great practical significance.
By applying the method, the times of adsorption and desorption of the oil gas by the carbon tank can be reduced, and the aging process of the carbon tank is delayed; meanwhile, the invention can increase the fuel content in the engine gas during desorption, reduce the requirement on the desorption air quantity and finally improve the control capability of the fuel system of the traditional fuel vehicle on hydrocarbon pollutants.
Drawings
FIG. 1 is a schematic diagram of the basic structure of an adsorption and desorption control system for a light car canister according to the present invention;
FIG. 2 is a schematic diagram showing the connection states of three solenoid valves with an engine, an oil tank and a carbon tank in the adsorption and desorption control system of the carbon tank of the light automobile provided by the invention;
fig. 3 is a basic schematic diagram of a control method of an adsorption and desorption control system of a light car carbon tank provided by the invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
In the description of this patent, it should be noted that, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "disposed" are to be construed broadly, and may be fixedly connected, disposed, detachably connected, disposed, or integrally connected, disposed, for example. The specific meaning of the terms in this patent will be understood by those of ordinary skill in the art as the case may be.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
Referring to fig. 1 and 2, the present invention provides an adsorption and desorption control system of a canister for a light vehicle, which includes an engine 100, an oil tank 200, and a canister 300, and first, second, and third solenoid valves 1, 2, and 3;
wherein, the desorption port A on the engine 100 is communicated with one end of the first electromagnetic valve 1 through a hollow first connecting pipeline 401;
the adsorption port B on the oil tank 200 is communicated with one end of the second electromagnetic valve 2 through a hollow second connecting pipeline 402;
the adsorption and desorption integrated port C on the carbon tank 300 is communicated with one end of the third electromagnetic valve 3 through a hollow third connecting pipeline 403;
the other end of the first electromagnetic valve 1, the other end of the second electromagnetic valve 2 and the other end of the third electromagnetic valve 3 are converged and intersected together;
an atmospheric port D on the carbon canister 300 communicates with the external atmospheric environment;
it should be noted that, in the present invention, the first solenoid valve 1, the second solenoid valve 2, and the third solenoid valve 3 are used to control whether the oil gas in the first connection line 401, the second connection line 402, and the third connection line 403 passes through, respectively. Namely, the first solenoid valve 1 controls the desorption end of the engine, the second solenoid valve 2 controls the tank end, and the third solenoid valve 3 controls the canister end.
In order to match the three electromagnetic valves of the first electromagnetic valve 1, the second electromagnetic valve 2 and the third electromagnetic valve 3 for use, the invention improves the carbon tank, combines the original carbon tank adsorption port and desorption port into one, namely, an adsorption and desorption integrated port is arranged, the atmospheric port on the carbon tank is unchanged, and the structure of the adsorption and desorption control system (namely, a novel fuel system) of the light car carbon tank is shown in figure 1.
In the present invention, in particular, the diameter of the second connection line 402 (i.e., the connection line between the second solenoid valve 2 and the adsorption port on the tank 200) is larger than the diameter of the first connection line 401 (i.e., the connection line between the first solenoid valve 1 and the desorption port on the engine 100). By the design, the inner diameter of the second connecting pipeline 402 serving as the adsorption pipeline can be made larger, so that the ventilation resistance can be reduced, and the oil gas flowing out of the oil tank 200 can enter the carbon tank 300 to be adsorbed by the carbon tank.
In particular, the diameter of the second connecting pipe 402 ranges from 20mm to 24mm, and the diameter of the first connecting pipe 401 ranges from 16 mm to 20mm.
In the present invention, in particular, the desorption port a on the engine 100 is provided on a connecting pipe between the throttle valve 101 of the engine 100 and the cylinder 102 inner cavity of the engine 100, that is, a pipe position located in the front section of the throttle valve 101 of the engine 100.
In the present invention, in particular, an oil level sensor 202 and a fuel temperature sensor 203 are provided in the oil tank 200.
In the present invention, in particular, a tank pressure sensor 201 is disposed on the top inner side of the tank 200;
the tank pressure sensor 201 is configured to detect the oil gas pressure in the tank 200 in real time, send a trigger closing control signal to the second electromagnetic valve 2 when the oil gas pressure in the tank 200 is lower than a preset pressure lower limit value, so that the second electromagnetic valve 2 is closed, and send a trigger opening control signal to the second electromagnetic valve 2 when the oil gas pressure in the tank 200 is higher than a preset pressure upper limit value, so that the second electromagnetic valve 2 is opened, and the oil gas is released from the tank 200, so that the oil gas pressure in the tank 200 is reduced;
wherein, the preset pressure upper limit value is larger than the preset pressure lower limit value.
In the present invention, the first solenoid valve 1, the second solenoid valve 2 and the third solenoid valve 3 are preferably integrally provided.
It should be noted that, the first electromagnetic valve 1, the second electromagnetic valve 2 and the third electromagnetic valve 3 are connected inside the three electromagnetic valves, which can be communicated two by two to realize oil gas flow.
In the invention, the first electromagnetic valve 1, the second electromagnetic valve 2 and the third electromagnetic valve 3 are connected with an ECU (i.e. an electronic control unit, also called a driving computer) on a vehicle;
an ECU on the vehicle for independently controlling the opening and closing of the first solenoid valve 1, the second solenoid valve 2, and the third solenoid valve 3.
In the ECU on the vehicle, the first solenoid valve 1, the second solenoid valve 2, and the third solenoid valve 3 may be controlled according to parameters such as whether the engine 100 is started, the operating state of the fuel filling switch on the vehicle, and the fuel pressure in the fuel tank, and the opening and closing of the valve bodies of the three solenoid valves may be controlled, respectively, in the control process, as shown in fig. 3.
Based on the adsorption and desorption control system of the light car carbon tank provided by the invention, referring to fig. 3, the invention also provides a control method of the adsorption and desorption control system of the light car carbon tank, which comprises the following steps:
step S1, acquiring the working state of an engine;
the working states of the engine comprise a non-starting state and a starting state;
in step S1, in the specific implementation, the working state of the engine may be obtained through an ECU (i.e., an electronic control unit, also called a driving computer) on the automobile;
step S2, when the engine is in a non-starting state, executing a preset first operation; executing a preset second operation when the engine is in a starting state;
the preset first operation and the preset second operation are used for reducing the oil gas quality entering the carbon canister 300 and reducing the adsorption oil gas quality of the carbon canister 300.
In the present invention, in step S2, a preset first operation specifically includes the following sub-steps:
step S211, acquiring the working state of a refueling switch;
the working states of the oiling switch comprise an opening state and a closing state;
in step S211, in particular, the operating state of the fueling switch may be obtained by the ECU (i.e. electronic control unit, also called a driving computer) on the automobile;
step S212, when the refueling switch is in an open state, the second electromagnetic valve 2 and the third electromagnetic valve 3 are controlled to be opened, and the first electromagnetic valve 1 is closed, so that oil gas in the oil tank 200 is introduced into the carbon canister 300 through the second electromagnetic valve 2 and the third electromagnetic valve 3 in sequence;
when the oil filling switch is in a closed state, acquiring an oil gas pressure value in the oil tank 200 through an oil tank pressure sensor 201 arranged on the oil tank 200, and comparing the oil gas pressure value in the oil tank 200 with a preset pressure upper limit value; if the oil gas pressure value in the oil tank 200 is smaller than the preset pressure upper limit value, the first electromagnetic valve 1, the second electromagnetic valve 2 and the third electromagnetic valve 3 are controlled to be closed, so that the oil gas quality entering the carbon tank 300 is reduced, the adsorption oil gas quality of the carbon tank 300 is reduced, otherwise (namely, the oil gas pressure value in the oil tank 200 is larger than or equal to the preset pressure upper limit value), the second electromagnetic valve 2 and the third electromagnetic valve 3 are controlled to be opened, the first electromagnetic valve 1 is controlled to be closed, and the oil gas in the oil tank 200 is led into the carbon tank 300.
In the present invention, it should be noted that, the fuel filling switch is in an open state, which indicates that the vehicle has a fuel filling requirement at this time, the fuel tank cover 204 on the fuel tank 200 is opened, the whole fuel system needs to be depressurized, at this time, the second electromagnetic valve 2 and the third electromagnetic valve 3 are controlled to be opened, the first electromagnetic valve 1 is closed, at this time, the oil gas in the fuel tank 200 is sequentially introduced into the carbon tank 300 through the second electromagnetic valve 2 and the third electromagnetic valve 3, and the oil gas generated in the fuel tank 200 can be introduced into the carbon tank 300 during the fuel filling process, so as to realize temporary storage of the oil gas, and then the carbon tank can be desorbed according to the vehicle state.
In the present invention, it should be noted that, the fuel filling switch is in a closed state, which means that the vehicle is in an inactive state and there is no fuel filling requirement at this time, it is required to determine whether the fuel gas pressure in the fuel tank 200 reaches the set pressure limit value (specifically, the preset pressure upper limit value described above), if the fuel gas pressure in the fuel tank 200 does not reach the limit value, the first solenoid valve 1, the second solenoid valve 2 and the third solenoid valve 3 are controlled to be closed, and the fuel gas is continuously stored in the fuel tank 200, so as to reduce the fuel gas quality entering the carbon tank, reduce the adsorbed fuel gas quality of the carbon tank, and slow down the aging process of the activated carbon. If the tank pressure reaches the preset pressure limit value (specifically, the preset pressure upper limit value), the whole fuel system is required to be depressurized, the second electromagnetic valve 2 and the third electromagnetic valve 3 are controlled to be opened, and the first electromagnetic valve 1 is controlled to be closed, so that the oil gas in the tank 200 is introduced into the carbon canister 300, and temporary storage of the oil gas is realized.
In the present invention, in step S2, a preset second operation specifically includes the following sub-steps:
step S221, executing preset corresponding operation according to whether the engine reaches the desorption condition or not;
wherein, if the engine does not reach the desorption condition, step S222 is performed, and if the desorption condition is reached, step S223 is performed;
in step S221, in the specific implementation, whether the engine reaches the desorption condition can be known through an ECU (i.e., an electronic control unit, also called a driving computer) on the automobile;
it should be noted that, the engine carries out desorption to the carbon canister, is under the prerequisite that satisfies engine power demand (rotational speed, moment of torsion), and desorption valve on the carbon canister opens, utilizes the throttle department negative pressure of engine for carbon canister desorption mouth end produces the negative pressure, and the air flows through the carbon canister to take away the oil gas that has adsorbed in the active carbon, finally brings into the engine, consumes after the engine burns.
Whether the desorption valve is opened or not is determined by the calibration work of the early engine, and the desorption condition of the engine and the opening of the desorption valve during desorption are finally determined by considering the comprehensive factors such as oil consumption, emission, power and the like.
The desorption control parameters of each automobile are stored in an ECU (electronic control unit, also called a driving computer) of the automobile in advance after the automobile engine is calibrated, and the desorption state of the automobile can be checked in the ECU, so that the desorption control conditions of the carbon tanks of different types of automobiles are slightly different due to the fact that the automobile is different in the design and calibration process of the automobile.
Step S222, acquiring an oil gas pressure value in the oil tank 200 through an oil tank pressure sensor 201 arranged on the oil tank 200, and comparing the oil gas pressure value in the oil tank 200 with a preset pressure upper limit value;
if the oil gas pressure value in the oil tank 200 is greater than or equal to the preset pressure upper limit value, controlling to open the second electromagnetic valve 2 and the third electromagnetic valve 3 and close the first electromagnetic valve 1, so that the oil gas in the oil tank 200 is introduced into the carbon tank 300;
if the oil gas pressure value in the oil tank 200 is smaller than the preset pressure upper limit value, the first electromagnetic valve 1, the second electromagnetic valve 2 and the third electromagnetic valve 3 are controlled to be closed, so that the oil gas quality entering the carbon tank 300 is reduced, and the adsorbed oil gas quality of the carbon tank 300 is reduced;
if the engine does not reach the desorption condition, the opening and closing of the three electromagnetic valves are determined according to the oil gas pressure in the oil tank. If the oil gas in the oil tank reaches a preset limit value (specifically, the preset upper pressure limit value), the whole fuel system needs to be depressurized, the second electromagnetic valve 2 and the third electromagnetic valve 3 are controlled to be opened, and the first electromagnetic valve 1 is closed, so that the oil gas in the oil tank 200 is introduced into the carbon tank 300, and temporary storage of the oil gas is realized; if the pressure of the oil gas in the oil tank does not reach the preset limit value (specifically, the preset pressure upper limit value), the first electromagnetic valve 1, the second electromagnetic valve 2 and the third electromagnetic valve 3 are controlled to be closed, the oil gas is continuously stored in the oil tank 200, and the quality of the oil gas entering the carbon tank 300 is reduced.
Step S223, acquiring an oil gas pressure value in the oil tank 200 through an oil tank pressure sensor 201 arranged on the oil tank 200, and comparing the oil gas pressure value in the oil tank 200 with a preset pressure upper limit value;
if the oil gas pressure value in the oil tank 200 is smaller than the preset pressure upper limit value, the first electromagnetic valve 1 and the second electromagnetic valve 2 are controlled to be opened, and the third electromagnetic valve 3 is controlled to be closed, so that the oil gas in the oil tank 200 is introduced into the engine 100 and is burnt and consumed by the engine 100, the oil gas quality entering the carbon tank 300 is reduced, and the times of adsorption and desorption of the oil gas by the carbon tank 300 are reduced;
if the oil gas pressure value in the oil tank 200 is greater than or equal to the preset pressure upper limit value, the first electromagnetic valve 1, the second electromagnetic valve 2 and the third electromagnetic valve 3 are controlled to be fully opened, so that the oil gas quality entering the carbon tank 300 can be reduced, and the times of adsorption and desorption of the oil gas by the carbon tank 300 can be reduced;
in the present invention, if the engine reaches the desorption condition, the opening and closing of the three solenoid valves are determined according to the oil-gas pressure in the oil tank.
If the oil gas pressure in the oil tank does not reach the set limit value (specifically, the preset pressure upper limit value), the first electromagnetic valve 1 and the second electromagnetic valve 2 are controlled to be opened at the moment, the oil gas directly enters the desorption port A of the front section of the throttle valve 101 of the engine 100 from the oil tank 200 through the valve bodies of the first electromagnetic valve 1 and the second electromagnetic valve 2 and is burnt and consumed by the engine 100, the oil gas quality entering the carbon tank 300 is reduced in the process, the times of adsorption and desorption of the oil gas by the carbon tank 300 are reduced, and the service life of the carbon tank is prolonged. Meanwhile, the requirement on the desorption air quantity is reduced, so that high-concentration oil gas is directly combusted by the engine 100, the adsorption and desorption processes of the oil gas by activated carbon are reduced, and finally the emission of hydrocarbon pollutants at the end D of the atmospheric port of the carbon tank is reduced.
If the oil pressure of the oil tank reaches the set limit value (specifically, the oil pressure is greater than or equal to the preset pressure upper limit value), the whole fuel system needs to be depressurized and the oil gas can be combusted by the engine, at the moment, the first electromagnetic valve 1, the second electromagnetic valve 2 and the third electromagnetic valve 3 are controlled to be fully opened, the oil gas enters the three electromagnetic valves of the first electromagnetic valve 1, the second electromagnetic valve 2 and the third electromagnetic valve 3 from the oil tank 200 according to the pressure difference, a part of the oil gas enters the engine 100 to be consumed, a part of the oil gas enters the carbon tank 300 to be absorbed by the activated carbon in the carbon tank 300, and then the air entering by the air port of the carbon tank is brought into the engine 100 to be combusted. Meanwhile, the requirement on the desorption air quantity is reduced, so that the high-concentration oil gas is directly combusted by the engine 100 (particularly enters a cylinder of the engine to be burnt), and finally the emission of hydrocarbon pollutants at the atmospheric port end of the carbon tank 300 is reduced.
Based on the above technical solutions, according to the present invention, as shown in fig. 3, the ECU on the vehicle sequentially determines the engine state, the working state of the refueling switch, and the oil gas pressure state in the oil tank, and finally determines the control states of the first solenoid valve 1, the second solenoid valve 2, and the third solenoid valve 3 according to the actual value and the limit value relationship, that is, controls the first solenoid valve 1, the second solenoid valve 2, and the third solenoid valve 3 respectively, and controls the opening and closing of the valve bodies respectively, so that the quality of the oil gas entering the carbon canister 300 is reduced through scientific control, the times of adsorbing and desorbing the oil gas of the carbon canister 300 are reduced, and the service life of the carbon canister is prolonged.
Compared with the prior conventional mode of controlling hydrocarbon pollutants by using the fuel system, the adsorption and desorption control system and the control method for the light car carbon tank provided by the invention have the following beneficial effects:
1. the quality of oil gas entering the carbon tank can be effectively reduced, and the carbon-hydrogen emission level of the whole vehicle is reduced;
2. the times of adsorption and desorption of oil gas of the carbon tank can be effectively reduced, and the aging process of the carbon tank is delayed;
3. the concentration of the oil gas in the gas entering the engine during carbon tank desorption can be increased, the quality of the oil gas entering the carbon tank is reduced, and meanwhile, the requirement on the desorption air quantity is reduced.
In summary, compared with the prior art, the adsorption and desorption control system and the control method for the light automobile carbon tank provided by the invention have the advantages that the design is scientific, the oil gas quality entering the carbon tank can be effectively reduced, the oil gas adsorption capacity in the carbon tank is prevented from exceeding the adsorption capacity of the carbon tank greatly, the carbon and hydrogen emission of the whole automobile is reduced, and the system and the method have great practical significance.
By applying the method, the times of adsorption and desorption of the oil gas by the carbon tank can be reduced, and the aging process of the carbon tank is delayed; meanwhile, the invention can increase the fuel content in the engine gas during desorption, reduce the requirement on the desorption air quantity and finally improve the control capability of the fuel system of the traditional fuel vehicle on hydrocarbon pollutants.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (10)
1. An adsorption and desorption control system of a light car carbon tank is characterized by comprising an engine (100), an oil tank (200), a carbon tank (300), a first electromagnetic valve (1), a second electromagnetic valve (2) and a third electromagnetic valve (3);
wherein, the desorption port on the engine (100) is communicated with one end of the first electromagnetic valve (1) through a hollow first connecting pipeline (401);
an adsorption port on the oil tank (200) is communicated with one end of a second electromagnetic valve (2) through a hollow second connecting pipeline (402);
the adsorption and desorption integrated port on the carbon tank (300) is communicated with one end of a third electromagnetic valve (3) through a hollow third connecting pipeline (403);
the other end of the first electromagnetic valve (1), the other end of the second electromagnetic valve (2) and the other end of the third electromagnetic valve (3) are converged and intersected together;
an atmospheric port on the carbon canister (300) is communicated with the external atmospheric environment;
the oil tank (200) is provided with an oil tank pressure sensor (201).
2. The adsorption and desorption control system for a light vehicle canister according to claim 1, wherein the diameter of the second connecting line (402) is larger than the diameter of the first connecting line (401).
3. The adsorption and desorption control system for a light vehicle canister according to claim 2, wherein the second connecting pipe (402) has a diameter ranging from 20 to 24mm and the first connecting pipe (401) has a diameter ranging from 16 to 20mm.
4. The canister adsorption and desorption control system according to claim 1, characterized in that the desorption port on the engine (100) is provided on a connecting pipe between the throttle valve (101) of the engine (100) and the cylinder (102) inner cavity of the engine (100).
5. The canister adsorption and desorption control system for a light vehicle according to claim 1, wherein the tank pressure sensor (201) is configured to detect the oil gas pressure in the tank (200) in real time, and send a trigger-off control signal to the second solenoid valve (2) when the oil gas pressure in the tank (200) is lower than a preset pressure lower limit value, so that the second solenoid valve (2) is closed, and send a trigger-on control signal to the second solenoid valve (2) when the oil gas pressure in the tank (200) is higher than a preset pressure upper limit value, so that the second solenoid valve (2) is opened, so that the oil gas is released from the tank (200), and the oil gas pressure in the tank (200) is lowered.
6. The adsorption and desorption control system for a canister of a light vehicle according to claim 1, characterized in that the first solenoid valve (1), the second solenoid valve (2) and the third solenoid valve (3) are integrally provided together.
7. The adsorption and desorption control system of a light car canister according to claim 1, characterized in that the first solenoid valve (1), the second solenoid valve (2) and the third solenoid valve (3) are connected to an ECU on the vehicle;
and the ECU on the vehicle is used for controlling the opening and closing of the first electromagnetic valve (1), the second electromagnetic valve (2) and the third electromagnetic valve (3).
8. A control method of an adsorption and desorption control system for a canister of a light-duty car according to any one of claims 1 to 7, comprising the steps of:
step S1, acquiring the working state of an engine;
the working states of the engine comprise a non-starting state and a starting state;
step S2, when the engine is in a non-starting state, executing a preset first operation; executing a preset second operation when the engine is in a starting state;
the preset first operation and the preset second operation are used for reducing the oil gas quality entering the carbon tank (300) and reducing the adsorption oil gas quality of the carbon tank (300).
9. The control method of the adsorption and desorption control system of the light car canister according to claim 8, characterized in that in step S2, the preset first operation specifically includes the following sub-steps:
step S211, acquiring the working state of a refueling switch;
the working states of the oiling switch comprise an opening state and a closing state;
step S212, when the oiling switch is in an open state, the second electromagnetic valve (2) and the third electromagnetic valve (3) are controlled to be opened, and the first electromagnetic valve (1) is closed, so that oil gas in the oil tank (200) is sequentially introduced into the carbon tank (300) through the second electromagnetic valve (2) and the third electromagnetic valve (3);
when the oiling switch is in a closed state, acquiring an oil gas pressure value in the oil tank (200) through an oil tank pressure sensor (201) arranged on the oil tank (200), and comparing the oil gas pressure value in the oil tank (200) with a preset pressure upper limit value; if the oil gas pressure value in the oil tank (200) is smaller than the preset pressure upper limit value, the first electromagnetic valve (1), the second electromagnetic valve (2) and the third electromagnetic valve (3) are controlled to be closed, so that the oil gas quality entering the carbon tank (300) is reduced, the adsorption oil gas quality of the carbon tank (300) is reduced, otherwise, the second electromagnetic valve (2) and the third electromagnetic valve (3) are controlled to be opened, the first electromagnetic valve (1) is controlled to be closed, and the oil gas in the oil tank (200) is led into the carbon tank (300).
10. The control method of the adsorption and desorption control system of the canister of the light vehicle according to claim 8, characterized in that in step S2, the preset second operation specifically includes the sub-steps of:
step S221, executing preset corresponding operation according to whether the engine reaches the desorption condition or not;
wherein, if the engine does not reach the desorption condition, step S222 is performed, and if the desorption condition is reached, step S223 is performed;
step S222, acquiring an oil gas pressure value in the oil tank (200) through an oil tank pressure sensor (201) arranged on the oil tank (200), and comparing the oil gas pressure value in the oil tank (200) with a preset pressure upper limit value;
if the oil gas pressure value in the oil tank (200) is greater than or equal to the preset pressure upper limit value, controlling to open the second electromagnetic valve (2) and the third electromagnetic valve (3) and closing the first electromagnetic valve (1) so as to lead the oil gas in the oil tank (200) to be led into the carbon tank (300);
if the oil gas pressure value in the oil tank (200) is smaller than the preset pressure upper limit value, the first electromagnetic valve (1), the second electromagnetic valve (2) and the third electromagnetic valve (3) are controlled to be closed, so that the oil gas quality entering the carbon tank (300) is reduced, and the adsorbed oil gas quality of the carbon tank (300) is reduced;
step S223, acquiring an oil gas pressure value in the oil tank (200) through an oil tank pressure sensor (201) arranged on the oil tank (200), and comparing the oil gas pressure value in the oil tank (200) with a preset pressure upper limit value;
if the oil gas pressure value in the oil tank (200) is smaller than the preset pressure upper limit value, controlling to open the first electromagnetic valve (1) and the second electromagnetic valve (2) and close the third electromagnetic valve (3), so that the oil gas in the oil tank (200) is introduced into the engine (100) and is burnt and consumed by the engine (100), thereby reducing the oil gas quality entering the carbon tank (300) and reducing the times of adsorption and desorption of the oil gas by the carbon tank (300);
if the oil gas pressure value in the oil tank (200) is greater than or equal to the preset pressure upper limit value, the first electromagnetic valve (1), the second electromagnetic valve (2) and the third electromagnetic valve (3) are controlled to be fully opened, so that the oil gas quality entering the carbon tank (300) can be reduced, and the times of adsorption and desorption of the oil gas by the carbon tank (300) are reduced.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117741016A (en) * | 2024-02-20 | 2024-03-22 | 中汽研汽车检验中心（天津）有限公司 | Volatile organic compound escape emission test method and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117741016A (en) * | 2024-02-20 | 2024-03-22 | 中汽研汽车检验中心（天津）有限公司 | Volatile organic compound escape emission test method and device |
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