CN114962084B - Fuel evaporation and emission control system and control method for hybrid electric vehicle and application of fuel evaporation and emission control system and control method - Google Patents
Fuel evaporation and emission control system and control method for hybrid electric vehicle and application of fuel evaporation and emission control system and control method Download PDFInfo
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- CN114962084B CN114962084B CN202210450056.1A CN202210450056A CN114962084B CN 114962084 B CN114962084 B CN 114962084B CN 202210450056 A CN202210450056 A CN 202210450056A CN 114962084 B CN114962084 B CN 114962084B
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- 239000000446 fuel Substances 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 title claims abstract description 32
- 230000008020 evaporation Effects 0.000 title claims abstract description 24
- 238000001704 evaporation Methods 0.000 title claims abstract description 24
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 102
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 94
- 238000009423 ventilation Methods 0.000 claims abstract description 27
- 238000003745 diagnosis Methods 0.000 claims abstract description 11
- 238000003795 desorption Methods 0.000 claims description 35
- 238000001179 sorption measurement Methods 0.000 claims description 19
- 230000008569 process Effects 0.000 claims description 13
- 230000005484 gravity Effects 0.000 claims description 7
- 230000008859 change Effects 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 6
- 239000002828 fuel tank Substances 0.000 claims description 6
- 238000012544 monitoring process Methods 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 4
- 230000009471 action Effects 0.000 claims description 3
- 238000002485 combustion reaction Methods 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 238000010992 reflux Methods 0.000 claims description 3
- 238000011161 development Methods 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 61
- 241000156302 Porcine hemagglutinating encephalomyelitis virus Species 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000295 fuel oil Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
Classifications
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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
- F02M25/089—Layout of the fuel vapour installation
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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
-
- 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
- F02M25/0809—Judging failure of purge control system
-
- 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
- F02M25/0836—Arrangement of valves controlling the admission of fuel vapour to an engine, e.g. valve being disposed between fuel tank or absorption canister and intake manifold
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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
- F02M25/0854—Details of the absorption canister
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- 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)
- Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
Abstract
The invention discloses a control system and a control method for fuel evaporation and emission of a hybrid electric vehicle type and application thereof, belonging to the technical field of automobile control, and comprising an engine, an ECU, a carbon tank electromagnetic valve, a carbon tank ventilation stop valve, an air filter, a low-pressure oil tank, a refueling stop valve and an oil tank pressure sensor; the ECU is connected with the engine, the carbon tank electromagnetic valve, the carbon tank ventilation stop valve and the oil tank pressure sensor respectively, the engine is connected with an inlet of the carbon tank, the carbon tank electromagnetic valve is arranged between the engine and the carbon tank, an outlet of the carbon tank is connected with the air filter, the carbon tank ventilation stop valve is arranged between the carbon tank and the air filter, an outlet of the low-pressure oil tank is connected with an inlet of the carbon tank, and the oil tank pressure sensor is used for detecting the pressure in the low-pressure oil tank. The system and the method can realize high-efficiency fuel evaporation control and complete oil tank leakage diagnosis work, greatly reduce the development cost of the whole vehicle and improve the volume and comprehensive endurance of the oil tank of the vehicle.
Description
Technical Field
The invention belongs to the technical field of automobile control, and particularly relates to a fuel evaporation and emission control system and method for a hybrid electric vehicle and application of the fuel evaporation and emission control system and method.
Background
The hybrid electric vehicle is characterized in that the engine is in a non-running or intermittent running state for a long time in the running process of the vehicle, and particularly for the PHEV vehicle, the running condition of the engine is less. Because the running time of the vehicle type engine is less, the fuel vapor generated in the running process of the vehicle cannot be desorbed in time, the pressure of the oil tank is increased, and the risk that the fuel vapor is discharged into the atmosphere through the carbon tank is increased. Under the general circumstances, for a PHEV model with higher hybrid electric vehicle, especially pure electric range, the production enterprises generally adopt a high-pressure oil tank with higher cost and smaller oil tank volume in order to meet the requirements of fuel evaporation and emission regulations, and meanwhile, the risk of evaporation and emission regulations is avoided by matching with a high-efficiency carbon tank or a large-volume carbon tank with higher cost.
Disclosure of Invention
In order to overcome the problems that a high-pressure oil tank with higher cost and smaller oil tank volume is commonly adopted in the prior art, and meanwhile, a high-efficiency carbon tank or a large-volume carbon tank with higher cost is matched to avoid evaporation emission and the like, the invention provides a control system and a control method for evaporation emission of fuel oil of a hybrid electric vehicle type and application thereof, which can realize high-efficiency fuel oil evaporation control and complete oil tank leakage diagnosis work, greatly reduce the development cost of the whole vehicle, and improve the oil tank volume and comprehensive endurance capacity of the vehicle.
The invention is realized by the following technical scheme:
In a first aspect, the invention provides a fuel evaporation emission control system of a hybrid electric vehicle, which comprises an engine 1, an ECU 2, a carbon tank electromagnetic valve 3, a carbon tank 4, a carbon tank ventilation stop valve 5, an air filter 6, a low-pressure oil tank 7, a refueling stop valve 8 and an oil tank pressure sensor 10; the ECU 2 is connected with the engine 1, the carbon tank electromagnetic valve 3, the carbon tank ventilation stop valve 5 and the oil tank pressure sensor 10 respectively, the engine 1 is connected with an inlet of the carbon tank 4, the carbon tank electromagnetic valve 3 is arranged between the engine 1 and the carbon tank 4, an outlet of the carbon tank 4 is connected with the air filter 6, the carbon tank ventilation stop valve 5 is arranged between the carbon tank 4 and the air filter 6, an outlet of the low-pressure oil tank 7 is connected with an inlet of the carbon tank 4, and the oil tank pressure sensor 10 is used for detecting pressure in the low-pressure oil tank 7.
Further, the engine 1 is connected to the canister 4 through a desorption line 15, and the low-pressure tank 7 is connected to an inlet of the canister 4 through a desorption line 14.
Further, a fueling stop valve 8 is connected to a nozzle of the desorption pipeline 14 in the low-pressure oil tank 7.
Further, a gravity vent valve 9 is further arranged in the low-pressure oil tank 7, the gravity vent valve 9 is located at two sides of the horizontal position center of the low-pressure oil tank 7 and used for guaranteeing exhaust in the oiling process after the low-pressure oil tank 7 is inclined, and the oil tank pressure sensor 10 is located at a horizontal high point of the low-pressure oil tank 7.
Further, a filling stop valve 12 is arranged at the inlet of the low-pressure oil tank 7, and the inlet of the low-pressure oil tank 7 is connected with a filling pipe 13; the side of the low-pressure oil tank 7 is also connected with a circulating pipe 11 for refluxing fuel vapor generated in the vehicle refueling process so as to ensure the smoothness of refueling.
In a second aspect, the present invention provides a method for controlling evaporative emission of fuel in a hybrid vehicle, including:
fuel adsorption control: the ECU 2 controls the ventilation stop valve 5 to be closed, so that fuel evaporation control is realized, the pressure in the low-pressure oil tank 7 is monitored in real time through the oil tank pressure sensor 10, and a desorption program is started after the oil tank pressure sensor 10 reaches a calibrated pressure value;
and (3) fuel desorption control: the ECU 2 controls the carbon tank electromagnetic valve 3 and the carbon tank ventilation stop valve 5 to be closed simultaneously, and under the conditions of oiling, running or insolation, a certain amount of fuel steam can be generated in the low-pressure oil tank 7 due to the volatilization characteristic of fuel, and the pressure in the low-pressure oil tank 7 can be increased after the fuel steam is generated; under the combined action of pressure and activated carbon in the carbon tank, fuel vapor enters the carbon tank 4 through the adsorption pipeline 14 and is adsorbed on the activated carbon in the carbon tank 4.
Further, the desorption procedure is specifically as follows: when the ECU 2 judges that the desorption program is activated, the ECU 2 controls the engine 1 to work under a stable working condition, then sequentially controls the carbon tank ventilation stop valve 5 and the carbon tank electromagnetic valve 3 to be opened, fresh air enters the carbon tank 4 through the air filter 6 under the air suction effect of the engine 1, fuel vapor stored in the carbon tank 4 is changed into mixed gas, and the mixed gas enters the engine 1 through the desorption pipeline 15 to participate in the combustion of the engine 1.
In a third aspect, the present invention provides an application of a fuel evaporative emission control system of a hybrid vehicle type, which is applicable to fuel tank leak detection including desorption diagnosis and adsorption diagnosis.
Further, before the desorption diagnosis starts the desorption program, the ECU 2 controls the carbon tank ventilation stop valve 5 to be closed, and simultaneously controls the carbon tank electromagnetic valve 3 to be opened for desorption, because the ventilation stop valve 5 is closed, the engine can only pump air from the low-pressure oil tank 7, the pressure in the low-pressure oil tank 7 can be reduced in the air pumping process, and the ECU 2 determines whether the leakage phenomenon exists in the low-pressure oil tank 7, the carbon tank 4, the adsorption pipeline 14 and the desorption pipeline 15 by monitoring the pressure change condition in the low-pressure oil tank 7 in real time.
Further, the adsorption diagnosis is that after the adsorption program is started, the pressure in the low-pressure oil tank 7 can be gradually increased due to the volatilization effect of the fuel vapor, and the ECU 2 determines whether the leakage phenomenon exists in the low-pressure oil tank 7, the carbon tank 4, the adsorption pipeline 14 and the desorption pipeline 15 by monitoring the pressure change condition in the low-pressure oil tank 7 in real time.
Compared with the prior art, the invention has the following advantages:
the invention relates to a fuel evaporation and emission control system of a hybrid vehicle type, a control method and application thereof, which adopts hardware such as a normal pressure fuel tank, a carbon tank, a fuel tank pressure sensor, a carbon tank ventilation stop valve and the like and combines ECU control strategy optimization to meet the requirements of fuel evaporation and emission control and fuel tank leakage detection of the hybrid vehicle type.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. Like elements or portions are generally identified by like reference numerals throughout the several figures. In the drawings, elements or portions thereof are not necessarily drawn to scale.
FIG. 1 is a schematic diagram of a fuel evaporative emission control system for a hybrid vehicle according to the present invention;
FIG. 2 is a schematic diagram of a method for controlling evaporative emissions from fuel in a hybrid vehicle according to the present invention;
In the figure: engine 1, ECU 2, tank solenoid valve 3, tank 4, tank vent shutoff valve 5, air filter 6, low pressure tank 7, refuel shutoff valve 8, gravity vent valve 9, tank pressure sensor 10, circulation pipe 11, refuel shutoff valve 12, refuel pipe 13, desorption line 14, desorption line 15.
Detailed Description
For a clear and complete description of the technical scheme and the specific working process thereof, the following specific embodiments of the invention are provided with reference to the accompanying drawings in the specification:
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
Example 1
As shown in fig. 1, the present embodiment provides a fuel evaporation and emission control system of a hybrid vehicle type, which comprises an engine 1, an ECU 2, a canister solenoid valve 3, a canister 4, a canister vent stop valve 5, an air filter 6, a low-pressure oil tank 7, a refueling stop valve 8 and an oil tank pressure sensor 10; the ECU 2 is connected with the engine 1, the carbon tank electromagnetic valve 3, the carbon tank ventilation stop valve 5 and the oil tank pressure sensor 10 respectively, the engine 1 is connected with an inlet of the carbon tank 4, the carbon tank electromagnetic valve 3 is arranged between the engine 1 and the carbon tank 4, an outlet of the carbon tank 4 is connected with the air filter 6, the carbon tank ventilation stop valve 5 is arranged between the carbon tank 4 and the air filter 6, an outlet of the low-pressure oil tank 7 is connected with an inlet of the carbon tank 4, and the oil tank pressure sensor 10 is used for detecting pressure in the low-pressure oil tank 7.
In this embodiment, the engine 1 is connected to the canister 4 via a desorption line 15, and the low-pressure tank 7 is connected to the inlet of the canister 4 via a desorption line 14.
In this embodiment, the nozzle of the desorption pipe 14 in the low-pressure oil tank 7 is connected with a fueling stop valve 8.
In this embodiment, the gravity vent valve 9 is further disposed in the low pressure oil tank 7, and the gravity vent valve 9 is located at two sides of the horizontal position center of the low pressure oil tank 7, so as to ensure that the low pressure oil tank 7 is inclined and then is exhausted in the oiling process, and the oil tank pressure sensor 10 is located at a horizontal high point of the low pressure oil tank 7.
In this embodiment, a filling stop valve 12 is provided at the inlet of the low-pressure oil tank 7, and the inlet of the low-pressure oil tank 7 is connected to a filling pipe 13. The low-pressure oil tank 7 is also connected with a circulating pipe 11 for refluxing fuel vapor generated in the vehicle refueling process so as to ensure the smoothness of refueling.
Example 2
As shown in fig. 2, the present embodiment provides a method for controlling evaporative emission of fuel in a hybrid vehicle, including:
Fuel adsorption control: the ECU 2 controls the ventilation stop valve 5 to be closed, so that fuel evaporation control is realized, the pressure in the low-pressure oil tank 7 is monitored in real time through the oil tank pressure sensor 10, and a desorption program is started after the oil tank pressure sensor 10 reaches a calibrated pressure value
And (3) fuel desorption control: the ECU 2 controls the carbon tank electromagnetic valve 3 and the carbon tank ventilation stop valve 5 to be closed simultaneously, and under the conditions of oiling, running or insolation, a certain amount of fuel steam can be generated in the low-pressure oil tank 7 due to the volatilization characteristic of fuel, and the pressure in the low-pressure oil tank 7 can be increased after the fuel steam is generated; under the combined action of pressure and activated carbon in the carbon tank, fuel vapor enters the carbon tank 4 through the adsorption pipeline 14 and is adsorbed on the activated carbon in the carbon tank 4.
In this embodiment, the desorption procedure is specifically as follows: when the ECU 2 judges that the desorption program is activated, the ECU 2 controls the engine 1 to work under a stable working condition, then sequentially controls the carbon tank ventilation stop valve 5 and the carbon tank electromagnetic valve 3 to be opened, fresh air enters the carbon tank 4 through the air filter 6 under the air suction effect of the engine 1, fuel vapor stored in the carbon tank 4 is changed into mixed gas, and the mixed gas enters the engine 1 through the desorption pipeline 15 to participate in the combustion of the engine 1.
Example 3
As shown in fig. 2, the present embodiment provides an application of the fuel evaporative emission control system of the hybrid vehicle type, which is applicable to the fuel tank leak detection including the desorption diagnosis and the adsorption diagnosis.
In this embodiment, before the desorption process is started, the ECU 2 controls the carbon tank ventilation stop valve 5 to be closed, and controls the carbon tank electromagnetic valve 3 to be opened for desorption, and due to the closing of the ventilation stop valve 5, the engine can only pump air from the low-pressure oil tank 7, the pressure in the low-pressure oil tank 7 can be reduced in the air pumping process, and the ECU 2 determines whether the leakage phenomenon exists in the low-pressure oil tank 7, the carbon tank 4, the adsorption pipeline 14 and the desorption pipeline 15 by monitoring the pressure change condition in the low-pressure oil tank 7 in real time.
In this embodiment, the adsorption diagnosis is that after the adsorption procedure is started, the pressure in the low-pressure oil tank 7 will gradually rise due to the volatilization effect of the fuel vapor, and the ECU 2 determines whether the leakage phenomenon exists in the low-pressure oil tank 7, the carbon tank 4, the adsorption pipeline 14 and the desorption pipeline 15 by monitoring the pressure change condition in the low-pressure oil tank 7 in real time.
The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the scope of the technical concept of the present invention, and all the simple modifications belong to the protection scope of the present invention.
In addition, the specific features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various possible combinations are not described further.
Moreover, any combination of the various embodiments of the invention can be made without departing from the spirit of the invention, which should also be considered as disclosed herein.
Claims (6)
1. The fuel evaporation and emission control system of the hybrid vehicle type is characterized by comprising an engine (1), an ECU (2), a carbon tank electromagnetic valve (3), a carbon tank (4), a carbon tank ventilation stop valve (5), an air filter (6), a low-pressure oil tank (7), a refueling stop valve (8) and an oil tank pressure sensor (10); the ECU (2) is respectively connected with the engine (1), the carbon tank electromagnetic valve (3), the carbon tank ventilation stop valve (5) and the oil tank pressure sensor (10), the engine (1) is connected with the inlet of the carbon tank (4), the carbon tank electromagnetic valve (3) is arranged between the engine (1) and the carbon tank (4), the outlet of the carbon tank (4) is connected with the air filter (6), the carbon tank ventilation stop valve (5) is arranged between the carbon tank (4) and the air filter (6), the outlet of the low-pressure oil tank (7) is connected with the inlet of the carbon tank (4), and the oil tank pressure sensor (10) is used for detecting the pressure in the low-pressure oil tank (7);
The engine (1) is connected with the carbon tank (4) through a desorption pipeline (15), and the low-pressure oil tank (7) is connected with an inlet of the carbon tank (4) through a desorption pipeline (14);
The desorption pipeline (14) is connected with a refueling stop valve (8) at a pipe orifice in the low-pressure oil tank (7);
a gravity vent valve (9) is further arranged in the low-pressure oil tank (7), the gravity vent valve (9) is positioned at two sides of the horizontal position center of the low-pressure oil tank (7) and used for guaranteeing exhaust in the oiling process after the low-pressure oil tank (7) is inclined, and an oil tank pressure sensor (10) is positioned at a horizontal high point of the low-pressure oil tank (7);
An inlet of the low-pressure oil tank (7) is provided with a refueling stop valve (12), and the inlet of the low-pressure oil tank (7) is connected with a refueling pipe (13); the side surface of the low-pressure oil tank (7) is also connected with a circulating pipe (11) for refluxing fuel steam generated in the vehicle oiling process so as to ensure the smoothness of oiling.
2. The emission method of a fuel evaporative emission control system for a hybrid vehicle as defined in claim 1, comprising:
fuel adsorption control: the ECU (2) is used for controlling the ventilation stop valve (5) to be closed, so that fuel evaporation control is realized, the pressure in the low-pressure oil tank (7) is monitored in real time through the oil tank pressure sensor (10), and a desorption program is started after the oil tank pressure sensor (10) reaches a calibrated pressure value;
and (3) fuel desorption control: the electromagnetic valve (3) of the carbon tank and the ventilation stop valve (5) of the carbon tank are controlled to be closed simultaneously through the ECU (2), a certain amount of fuel steam can be generated in the low-pressure oil tank (7) due to the volatilization characteristic of fuel under the conditions of refueling, running or insolation, and the pressure in the low-pressure oil tank (7) can be increased after the fuel steam is generated; under the combined action of pressure and active carbon in the carbon tank, fuel steam enters the carbon tank (4) through an adsorption pipeline (14) and is adsorbed on the active carbon in the carbon tank (4).
3. The emission method of a fuel evaporation emission control system for a hybrid vehicle according to claim 2, wherein the desorption procedure is as follows: when the ECU (2) judges that the desorption program is activated, the ECU (2) controls the engine (1) to work under a stable working condition, then sequentially controls the carbon tank ventilation stop valve (5) and the carbon tank electromagnetic valve (3) to be opened, fresh air enters the carbon tank (4) through the air filter (6) under the air suction effect of the engine (1), fuel steam stored in the carbon tank (4) is changed into mixed gas, and the mixed gas enters the engine (1) through the desorption pipeline (15) to participate in the combustion of the engine (1).
4. The use of a hybrid vehicle fuel evaporative emissions control system as defined in claim 1 for fuel tank leak detection, including desorption diagnostics and adsorption diagnostics.
5. The application of the fuel evaporation and emission control system of the hybrid vehicle type according to claim 4, wherein before the desorption diagnosis is started, the ECU (2) controls the carbon tank ventilation stop valve (5) to be closed, and simultaneously controls the carbon tank electromagnetic valve (3) to be opened for desorption, and due to the closing of the ventilation stop valve (5), the engine can only be pumped from the low-pressure oil tank (7), the pressure in the low-pressure oil tank (7) can be reduced in the pumping process, and the ECU (2) determines whether the leakage phenomenon exists in the low-pressure oil tank (7), the carbon tank (4), the adsorption pipeline (14) and the desorption pipeline (15) by monitoring the pressure change condition in the low-pressure oil tank (7) in real time.
6. The application of the fuel evaporation and emission control system for the hybrid vehicle type according to claim 4, wherein the adsorption diagnosis is that after the adsorption program is started, the pressure in the low-pressure oil tank (7) can be gradually increased due to the volatilization effect of fuel steam, and the ECU (2) judges whether the leakage phenomenon exists in the low-pressure oil tank (7), the carbon tank (4), the adsorption pipeline (14) and the desorption pipeline (15) by monitoring the pressure change condition in the low-pressure oil tank (7) in real time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210450056.1A CN114962084B (en) | 2022-04-26 | 2022-04-26 | Fuel evaporation and emission control system and control method for hybrid electric vehicle and application of fuel evaporation and emission control system and control method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210450056.1A CN114962084B (en) | 2022-04-26 | 2022-04-26 | Fuel evaporation and emission control system and control method for hybrid electric vehicle and application of fuel evaporation and emission control system and control method |
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| CN114962084A CN114962084A (en) | 2022-08-30 |
| CN114962084B true CN114962084B (en) | 2024-05-14 |
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