CN110080912B - Active desorption gasoline vapor and secondary injection system and method - Google Patents
Active desorption gasoline vapor and secondary injection system and method Download PDFInfo
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- CN110080912B CN110080912B CN201910305772.9A CN201910305772A CN110080912B CN 110080912 B CN110080912 B CN 110080912B CN 201910305772 A CN201910305772 A CN 201910305772A CN 110080912 B CN110080912 B CN 110080912B
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- 238000003795 desorption Methods 0.000 title claims abstract description 162
- 238000002347 injection Methods 0.000 title claims abstract description 83
- 239000007924 injection Substances 0.000 title claims abstract description 83
- 239000003502 gasoline Substances 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 77
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 77
- 239000002828 fuel tank Substances 0.000 claims description 23
- 238000009423 ventilation Methods 0.000 claims description 15
- 239000003054 catalyst Substances 0.000 claims description 13
- 229910052760 oxygen Inorganic materials 0.000 claims description 11
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 10
- 239000001301 oxygen Substances 0.000 claims description 10
- 238000001514 detection method Methods 0.000 claims description 9
- 239000000446 fuel Substances 0.000 claims description 8
- 239000000295 fuel oil Substances 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 5
- 238000001704 evaporation Methods 0.000 claims description 3
- 230000008020 evaporation Effects 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 238000000605 extraction Methods 0.000 claims description 2
- 238000006073 displacement reaction Methods 0.000 abstract description 5
- 238000009434 installation Methods 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
- F01N3/2033—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using a fuel burner or introducing fuel into exhaust duct
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B77/00—Component parts, details or accessories, not otherwise provided for
- F02B77/08—Safety, indicating, or supervising devices
-
- 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
-
- 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
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
- F01N2570/10—Carbon or carbon oxides
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
- F01N2570/12—Hydrocarbons
-
- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Exhaust Gas After Treatment (AREA)
- Supplying Secondary Fuel Or The Like To Fuel, Air Or Fuel-Air Mixtures (AREA)
Abstract
The invention discloses an active desorption gasoline vapor and secondary injection system, which comprises a secondary injection pipeline, an active desorption pipeline and a desorption pump, wherein the secondary injection pipeline is connected with the desorption pump and pumps air into an engine exhaust pipe of the secondary injection pipeline for secondary injection, and the active desorption pipeline is connected with the desorption pump and pumps gasoline vapor into an engine intake pipe of the active desorption pipeline for active desorption. The desorption flow of a vehicle carrying a small-displacement turbocharged engine can be increased, so that the carbon canister of the vehicle can be sufficiently desorbed, and the requirements of national emission regulations are met; on the basis of solving the problem of active desorption of gasoline vapor, the device can realize the function of secondary injection, and saves the cost and the installation space of the system while meeting the requirement of tail gas emission.
Description
Technical Field
The invention relates to the technical field of automobile emission control, in particular to an active desorption gasoline vapor and secondary injection system and method.
Background
In modern society, fuel consumption and emission regulations of automobiles are more and more strict, and more vehicles in the market use a small-displacement turbocharged engine to meet the strict fuel consumption and emission requirements, namely the phenomenon of 'small horse drawn large vehicle' which is often called by families. In this state, the small displacement turbocharged engine is often operated under high load, that is, the turbocharger is in operation for a long time, which causes the intake manifold of the engine to be in a positive pressure state most of the time. The carbon canister is used as an important part for absorbing gasoline vapor, gasoline vapor in the carbon canister needs to be sucked into an engine intake manifold by means of negative pressure of an engine after the engine is started, then the gasoline vapor enters the cylinder to participate in combustion, recycling of the gasoline vapor is achieved, and therefore the purpose of reducing emission is achieved. However, if the negative pressure of the engine is insufficient, the fuel vapor in the canister is difficult to desorb completely, i.e. the desorption flow is insufficient. In order to solve the problems, a venturi tube mode is mainly used in the market at present to solve the problem of insufficient desorption flow of a small-emission engine, but the phenomenon of insufficient desorption flow still occurs in partial vehicle types or hybrid vehicle types.
The national 6 regulation increases the leakage detection requirement of the evaporative emission system, namely, the OBD (on-board diagnostics) can detect the leakage of the evaporative emission system of 0.5mm or 1mm and light an engine fault lamp when the vehicle is in use. Currently, most vehicle models adopt a negative pressure diagnosis technology, namely, a negative pressure source of an engine is used for pumping negative pressure to an oil tank so as to judge whether leakage exists. If the negative pressure of the engine is insufficient, the vacuumizing capacity of the oil tank is limited, so that the purpose of detection cannot be achieved.
When the engine is started in cold or under other partial working conditions, because the conversion efficiency of the catalyst does not reach the optimal state, harmful substances such as HC, CO and the like in the tail gas can not be well converted into CO by the three-way catalyst2And water, so that the exhaust emission can not meet the requirements of regulations, and a set of secondary injection system is generally designed in the industry to inject air into the exhaust pipe by separately designing the secondary injection system, so that HC, CO and oxygen are fully combusted, and the emission is reduced.
Disclosure of Invention
The invention aims to provide an active desorption gasoline vapor and secondary injection system and method which can realize active desorption gasoline vapor and secondary injection function, aiming at the defects of the technology.
In order to achieve the purpose, the active desorption gasoline vapor and secondary injection system designed by the invention comprises: including secondary injection pipeline, initiative desorption pipeline and desorption pump, the secondary injection pipeline with the desorption pump links to each other and goes into the air pump the engine vent-pipe of secondary injection pipeline carries out the secondary and sprays, initiative desorption pipeline with the desorption pump links to each other and goes into petrol vapour pump the engine intake pipe of initiative desorption pipeline carries out the initiative desorption.
Further, the secondary injection pipeline includes the engine, the engine intake pipe with the air inlet of engine links to each other, the engine exhaust pipe with the gas vent of engine links to each other, the air inlet of the same way of desorption pump through first solenoid valve with the engine intake pipe links to each other, the gas outlet of the same way of desorption pump through the secondary injection pipe with the engine exhaust pipe links to each other, be provided with the second solenoid valve on the secondary injection pipe.
Further, the active desorption pipeline comprises a carbon canister, the carbon canister is connected with another path of air inlet of the desorption pump, another path of air outlet of the desorption pump is connected with the engine air inlet pipe through an active desorption pipe, and a carbon canister electromagnetic valve is arranged on the active desorption pipe.
Further, the carbon canister type fuel tank assembly further comprises a fuel tank assembly connected with the carbon canister, and a fuel tank pressure sensor is arranged on the fuel tank assembly.
Furthermore, the secondary injection pipeline also comprises a turbocharger connected with the engine and an air filter arranged at the inlet end of the air inlet pipe of the engine.
Further, a three-way catalyst is arranged on an engine exhaust pipe of the secondary injection pipeline, and the three-way catalyst is located on the outlet side of the engine oxygen sensor.
Further, a particle catcher is arranged on an engine exhaust pipe of the secondary injection pipeline.
Further, a second one-way valve is further arranged on the secondary injection pipe and located on the outlet side of the second electromagnetic valve.
Further, the active desorption pipeline further comprises an engine oxygen sensor arranged on the engine exhaust pipe, and the engine oxygen sensor is positioned on the inlet side of the three-way catalyst.
Furthermore, a first one-way valve is arranged on the active desorption pipe and is positioned on the outlet side of the carbon canister electromagnetic valve.
Further, the active desorption pipeline further comprises a carbon canister ash filter, and the carbon canister ash filter is connected with the carbon canister through a carbon canister ventilation electromagnetic valve.
The method for actively desorbing gasoline vapor and the secondary injection system is also provided, wherein when the engine is in a cold start state, the desorption pump is started, and pumps air into the engine exhaust pipe of the secondary injection pipeline for secondary injection;
when the engine is in a fuel oil desorption state, the desorption pump is started, and the desorption pump pumps gasoline vapor into the engine air inlet pipe of the active desorption pipeline for active desorption.
Further, when the engine is in a cold start state, the carbon canister electromagnetic valve and the carbon canister ventilation electromagnetic valve are closed, the first electromagnetic valve and the second electromagnetic valve are opened, the desorption pump is started, air enters the desorption pump through the first electromagnetic valve after passing through the air filter and then enters the engine exhaust pipe through the second electromagnetic valve, the desorption pump is closed after the desorption pump is operated according to the engine calibration data time, and the second electromagnetic valve and the first electromagnetic valve are closed simultaneously.
Further, when the engine is in a fuel oil desorption state, the first electromagnetic valve and the second electromagnetic valve are closed, the carbon canister electromagnetic valve and the carbon canister ventilation electromagnetic valve are opened, the desorption pump is started, air enters the carbon canister from the carbon canister ash filter, and gasoline vapor in the carbon canister is pumped into the engine air inlet pipe through the carbon canister electromagnetic valve by the desorption pump until entering the engine.
The method for actively desorbing the gasoline vapor and the secondary injection system is also provided, and when the leakage of the evaporated and discharged fuel is detected, the desorption pump detects the air extraction leakage of the fuel tank assembly.
Further, when fuel evaporation discharge leakage detection is carried out, the first electromagnetic valve, the second electromagnetic valve and the carbon tank ventilation electromagnetic valve are closed, the carbon tank electromagnetic valve is opened, the desorption pump is operated to pump the fuel tank assembly, the pressure P of the fuel tank pressure sensor is recorded, and when the pressure P is less than or equal to a calibration threshold value P0And stopping running the desorption pump, keeping the carbon tank ventilation electromagnetic valve closed, and recording a pressure attenuation curve in a specified time.
Compared with the prior art, the invention has the following advantages: the active gasoline vapor desorption and secondary injection system can increase the desorption flow of a vehicle carrying a small-displacement turbocharged engine, so that a carbon tank of the vehicle can be sufficiently desorbed, and the requirements of national emission regulations are met; on the basis of solving the problem of active desorption of gasoline vapor, the secondary injection function can be realized, and the cost and the installation space of the system are saved while the requirement of tail gas emission is met; in addition, the system can not depend on the negative pressure of the engine, and the system can pump the negative pressure to the closed system, thereby achieving the purpose of detecting the leakage of the evaporative emission system.
Drawings
FIG. 1 is a schematic flow chart of an active desorption gasoline vapor and secondary injection system of the present invention;
FIG. 2 is a schematic diagram of the secondary injection operating condition of FIG. 1;
FIG. 3 is a schematic diagram of the active desorption condition in FIG. 1;
FIG. 4 is a schematic diagram of the evaporative emissions leak detection scheme of FIG. 1.
The components in the figures are numbered as follows: the system comprises an air filter 1, a turbocharger 2, an engine oxygen sensor 3, a first electromagnetic valve 4, a carbon canister electromagnetic valve 5, a first one-way valve 6, a second one-way valve 7, a second electromagnetic valve 8, a desorption pump 9, a fuel tank pressure sensor 10, a fuel tank assembly 11, a carbon canister 12, a carbon canister ventilation electromagnetic valve 13, a secondary injection pipe 14, a carbon canister ash filter 15, a particle trap 16, an engine 17, an engine exhaust pipe 18, an engine intake pipe 19, a three-way catalyst 20 and an active desorption pipe 21.
Detailed Description
The invention is described in further detail below with reference to the figures and the specific embodiments.
As shown in fig. 1, the active desorption gasoline vapor and secondary injection system comprises a secondary injection pipeline, an active desorption pipeline and a desorption pump, wherein the secondary injection pipeline is connected with the desorption pump 9 and pumps air into an engine exhaust pipe 18 of the secondary injection pipeline for secondary injection, and the active desorption pipeline is connected with the desorption pump 9 and pumps gasoline vapor into an engine intake pipe 19 of the active desorption pipeline for active desorption.
The secondary injection pipeline comprises an engine 17, a turbocharger 2 connected with the engine 17, an air filter 1, a three-way catalyst 20 and a particle trap (GPF)16, an engine air inlet pipe 19 is connected with an air inlet of the engine 17, an engine exhaust pipe 18 is connected with an exhaust port of the engine 17, the air filter 1 is connected with an inlet end of the engine air inlet pipe 19, and the three-way catalyst 20 and the particle trap 16 are sequentially arranged on the engine exhaust pipe 18 along the exhaust direction; one path of air inlet of the desorption pump 9 is connected with an engine air inlet pipe 19 through a first electromagnetic valve 4, one path of air outlet of the desorption pump 9 is connected with an engine exhaust pipe 18 through a secondary injection pipe 14, a second electromagnetic valve 8 and a second one-way valve 7 are arranged on the secondary injection pipe 14, and the second one-way valve 7 is positioned on the outlet side of the second electromagnetic valve 8.
The active desorption pipeline comprises a carbon canister 12, an engine oxygen sensor 3 and a carbon canister ash filter 15 which are arranged on an engine exhaust pipe 18, the carbon canister ash filter 15 is connected with the carbon canister 12 through a carbon canister ventilation electromagnetic valve 13, the carbon canister 12 is connected with another path of air inlet of a desorption pump 9, another path of air outlet of the desorption pump 9 is connected with an engine air inlet pipe 19 through an active desorption pipe 21, a carbon canister electromagnetic valve 5 and a first one-way valve 6 are arranged on the active desorption pipe 21, the first one-way valve 6 is positioned on the outlet side of the carbon canister electromagnetic valve 5, and the engine oxygen sensor 3 is positioned on the inlet side of a three-way catalyst 20.
The canister 12 is connected to a fuel tank assembly 11, and the fuel tank assembly 11 is provided with a tank pressure sensor 10.
The active gasoline vapor desorption and secondary injection system can increase the desorption flow of a vehicle carrying a small-displacement turbocharged engine, so that a carbon tank of the vehicle can be sufficiently desorbed, and the requirements of national emission regulations are met; on the basis of solving the problem of active desorption of gasoline vapor, the secondary injection function can be realized, and the cost and the installation space of the system are saved while the requirement of tail gas emission is met; in addition, the system can not depend on the negative pressure of the engine, and the system can pump the negative pressure to the closed system, thereby achieving the purpose of detecting the leakage of the evaporative emission system.
In this embodiment, the first check valve 6 can only flow from the normally open canister solenoid valve 5 side to the engine intake pipe 19, and the second check valve 7 can only flow from the second solenoid valve 8 side to the engine exhaust pipe 18, and therefore, the flow is blocked in the reverse direction.
The active gasoline vapor desorption and secondary injection system is suitable for any vehicle type carrying a gasoline engine, and has the following specific working principle:
principle of secondary injection working condition: as shown in FIG. 2, the engine is in a cold start stateAt this time, since the three-way catalyst 20 has not yet reached the optimum operating temperature, HC and CO in the exhaust gas cannot be efficiently converted into CO2And H2And O, in order to enable the three-way catalyst 20 to reach the optimal working temperature as soon as possible and reduce the emission of HC and CO, closing the carbon canister electromagnetic valve 5 and the carbon canister ventilation electromagnetic valve 13, opening the first electromagnetic valve 4 and the second electromagnetic valve 8, and opening the desorption pump 9, wherein air passes through the air filter 1, then passes through the first electromagnetic valve 4, enters the desorption pump 9, then sequentially passes through the second electromagnetic valve 8 and the second one-way valve 7, enters the engine exhaust pipe 18, operates the desorption pump 9 for about 10-20 milliseconds according to the calibration data time of the engine 17, then closes the desorption pump 9, simultaneously closes the second electromagnetic valve 8 and the first electromagnetic valve 4, and opens the carbon canister ventilation electromagnetic valve 13. The air flow direction for this condition is shown by the black dashed line in fig. 2.
Active desorption working condition principle: as shown in fig. 3, when the engine 17 is in a fuel oil desorption state, the first solenoid valve 4 and the second solenoid valve 8 are closed, the canister solenoid valve 5 and the canister vent solenoid valve 13 are opened), the desorption pump 9 is started, the on-off time (PWM signal) of the canister solenoid valve 5 and the operation time of the desorption pump 9 are controlled according to the signal feedback received from the engine oxygen sensor 3, and the gasoline vapor enters the canister 12 from the canister ash filter 15 and then sequentially enters the engine intake pipe 19 through the canister solenoid valve 5 and the first check valve 6 until entering the engine 17. The air flow direction for this condition is shown by the black dashed line in fig. 3.
Evaporative emission leak detection working condition principle: as shown in fig. 4, when fuel evaporative emission leakage detection is performed, the first solenoid valve 4, the second solenoid valve 8 and the canister vent solenoid valve 13 are closed, the canister solenoid valve 5 is opened, the desorption pump 9 is operated to pump the fuel tank assembly 11, the pressure P of the fuel tank pressure sensor 10 is recorded, and when the pressure P is less than or equal to a calibration threshold value P0When the desorption pump 9 is stopped, the canister vent solenoid valve 13 is kept closed, and the specified time t is recorded1A pressure decay curve over time; and if the pressure attenuation curve is below the target curve, judging that the evaporative emission system leakage meets the regulation requirement, and if the pressure attenuation curve is above the target curve, judging that the evaporative emission system leakage does not meet the regulation requirement, and lighting an engine fault lamp. Under this operating modeThe direction of the air flow is shown by the black dashed line in fig. 4.
Claims (10)
1. The utility model provides an active desorption petrol vapour and secondary injection system which characterized in that: the device comprises a secondary injection pipeline, an active desorption pipeline and a desorption pump (9), wherein the secondary injection pipeline is connected with the desorption pump (9) and pumps air into an engine exhaust pipe (18) of the secondary injection pipeline for secondary injection, and the active desorption pipeline is connected with the desorption pump (9) and pumps gasoline vapor into an engine intake pipe (19) of the active desorption pipeline for active desorption;
the secondary injection pipeline comprises an engine (17), an engine air inlet pipe (19) is connected with an air inlet of the engine (17), an engine exhaust pipe (18) is connected with an air outlet of the engine (17), one path of air inlet of the desorption pump (9) is connected with the engine air inlet pipe (19) through a first electromagnetic valve (4), one path of air outlet of the desorption pump (9) is connected with the engine exhaust pipe (18) through a secondary injection pipe (14), and a second electromagnetic valve (8) is arranged on the secondary injection pipe (14);
the active desorption pipeline comprises a carbon tank (12), the carbon tank (12) is connected with the other path of air inlet of the desorption pump (9), the other path of air outlet of the desorption pump (9) is connected with the engine air inlet pipe (19) through an active desorption pipe (21), and a carbon tank electromagnetic valve (5) is arranged on the active desorption pipe (21); the active desorption pipeline further comprises a carbon canister ash filter (15), and the carbon canister ash filter (15) is connected with the carbon canister (12) through a carbon canister ventilation electromagnetic valve (13).
2. The active desorption gasoline vapor and secondary injection system of claim 1, wherein: the carbon canister is characterized by further comprising a fuel tank assembly (11) connected with the carbon canister (12), wherein a fuel tank pressure sensor (10) is arranged on the fuel tank assembly (11).
3. The active desorption gasoline vapor and secondary injection system of claim 1, wherein: the secondary injection pipeline also comprises a turbocharger (2) connected with the engine (17) and an air filter (1) arranged at the inlet end of the air inlet pipe (19) of the engine.
4. The active desorption gasoline vapor and secondary injection system of claim 1, wherein: and a three-way catalyst (20) is arranged on an engine exhaust pipe (18) of the secondary injection pipeline.
5. The active desorption gasoline vapor and secondary injection system of claim 1, wherein: and a particle catcher (16) is arranged on an engine exhaust pipe (18) of the secondary injection pipeline.
6. The active desorption gasoline vapor and secondary injection system of claim 1, wherein: and a second one-way valve (7) is further arranged on the secondary injection pipe (14), and the second one-way valve (7) is positioned on the outlet side of the second electromagnetic valve (8).
7. The active desorption gasoline vapor and secondary injection system of claim 4, wherein: the active desorption pipeline further comprises an engine oxygen sensor (3) arranged on the engine exhaust pipe (18), and the engine oxygen sensor (3) is located on the inlet side of the three-way catalyst (20).
8. The active desorption gasoline vapor and secondary injection system of claim 1, wherein: and a first one-way valve (6) is arranged on the active desorption pipe (21), and the first one-way valve (6) is positioned on the outlet side of the carbon canister electromagnetic valve (5).
9. An operation method of an active desorption gasoline vapor and secondary injection system comprises a secondary injection pipeline, an active desorption pipeline and a desorption pump (9), wherein the secondary injection pipeline is connected with the desorption pump (9) and pumps air into an engine exhaust pipe (18) of the secondary injection pipeline for secondary injection, and the active desorption pipeline is connected with the desorption pump (9) and pumps gasoline vapor into an engine intake pipe (19) of the active desorption pipeline for active desorption; the secondary injection pipeline comprises an engine (17), an engine air inlet pipe (19) is connected with an air inlet of the engine (17), an engine exhaust pipe (18) is connected with an air outlet of the engine (17), one path of air inlet of the desorption pump (9) is connected with the engine air inlet pipe (19) through a first electromagnetic valve (4), one path of air outlet of the desorption pump (9) is connected with the engine exhaust pipe (18) through a secondary injection pipe (14), and a second electromagnetic valve (8) is arranged on the secondary injection pipe (14); the active desorption pipeline comprises a carbon tank (12), the carbon tank (12) is connected with the other path of air inlet of the desorption pump (9), the other path of air outlet of the desorption pump (9) is connected with the engine air inlet pipe (19) through an active desorption pipe (21), and a carbon tank electromagnetic valve (5) is arranged on the active desorption pipe (21); the active desorption pipeline also comprises a carbon canister ash filter (15), and the carbon canister ash filter (15) is connected with the carbon canister (12) through a carbon canister ventilation electromagnetic valve (13); the secondary injection pipeline also comprises a turbocharger (2) connected with an engine (17) and an air filter (1) arranged at the inlet end of an air inlet pipe (19) of the engine;
the method is characterized in that:
when the engine is in a cold start state, starting a desorption pump (9), and pumping air into an engine exhaust pipe (18) of the secondary injection pipeline by the desorption pump (9) for secondary injection;
when the engine is in a cold start state, closing the carbon canister electromagnetic valve (5) and the carbon canister ventilation electromagnetic valve (13), opening the first electromagnetic valve (4) and the second electromagnetic valve (8), starting the desorption pump (9), enabling air to pass through the air filter (1), enter the desorption pump (9) through the first electromagnetic valve (4), enter the engine exhaust pipe (18) through the second electromagnetic valve (8), operate the desorption pump (9) according to the calibration data time of the engine (17), close the desorption pump (9), and simultaneously close the second electromagnetic valve (8) and the first electromagnetic valve (4);
when the engine (17) is in a fuel oil desorption state, starting a desorption pump (9), and pumping gasoline vapor into an engine air inlet pipe (19) of the active desorption pipeline by the desorption pump (9) for active desorption;
when the engine (17) is in a fuel oil desorption state, the first electromagnetic valve (4) and the second electromagnetic valve (8) are closed, the carbon canister electromagnetic valve (5) and the carbon canister ventilation electromagnetic valve (13) are opened, the desorption pump (9) is opened, air enters the carbon canister (12) through the carbon canister ash filter (15), and gasoline vapor in the carbon canister (12) is pumped into the engine air inlet pipe (19) through the carbon canister electromagnetic valve (5) by the desorption pump (9) until entering the engine (17).
10. An operation method of an active desorption gasoline vapor and secondary injection system comprises a secondary injection pipeline, an active desorption pipeline and a desorption pump (9), wherein the secondary injection pipeline is connected with the desorption pump (9) and pumps air into an engine exhaust pipe (18) of the secondary injection pipeline for secondary injection, and the active desorption pipeline is connected with the desorption pump (9) and pumps gasoline vapor into an engine intake pipe (19) of the active desorption pipeline for active desorption; the secondary injection pipeline comprises an engine (17), an engine air inlet pipe (19) is connected with an air inlet of the engine (17), an engine exhaust pipe (18) is connected with an air outlet of the engine (17), one path of air inlet of the desorption pump (9) is connected with the engine air inlet pipe (19) through a first electromagnetic valve (4), one path of air outlet of the desorption pump (9) is connected with the engine exhaust pipe (18) through a secondary injection pipe (14), and a second electromagnetic valve (8) is arranged on the secondary injection pipe (14); the active desorption pipeline comprises a carbon tank (12), the carbon tank (12) is connected with the other path of air inlet of the desorption pump (9), the other path of air outlet of the desorption pump (9) is connected with the engine air inlet pipe (19) through an active desorption pipe (21), and a carbon tank electromagnetic valve (5) is arranged on the active desorption pipe (21); the active desorption pipeline also comprises a carbon canister ash filter (15), and the carbon canister ash filter (15) is connected with the carbon canister (12) through a carbon canister ventilation electromagnetic valve (13); the carbon canister type fuel tank is characterized by further comprising a fuel tank assembly (11) connected with the carbon canister (12), wherein a fuel tank pressure sensor (10) is arranged on the fuel tank assembly (11);
the method is characterized in that:
when fuel evaporation discharge leakage detection is carried out, the desorption pump (9) carries out air extraction leakage detection on the fuel tank assembly (11); said is fed intoWhen fuel evaporation, discharge and leakage detection is carried out, the first electromagnetic valve (4), the second electromagnetic valve (8) and the carbon canister ventilation electromagnetic valve (13) are closed, the carbon canister electromagnetic valve (5) is opened, the desorption pump (9) is operated to pump air for the fuel tank assembly (11), the pressure P of the fuel tank pressure sensor (10) is recorded, and when the pressure P is smaller than or equal to a calibration threshold value P0When the system is running, the desorption pump (9) is stopped, the canister vent solenoid valve (13) is kept closed, and the pressure decay curve in the set time is recorded.
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| CN111622827A (en) * | 2020-06-05 | 2020-09-04 | 中国第一汽车股份有限公司 | Gasoline particle catcher regenerating unit and vehicle |
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| CN108730072A (en) * | 2017-04-17 | 2018-11-02 | 丰田自动车株式会社 | Evaporated fuel treating apparatus |
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| JP2017203415A (en) * | 2016-05-11 | 2017-11-16 | 愛三工業株式会社 | Evaporated fuel treatment device |
| US9890721B2 (en) * | 2016-07-15 | 2018-02-13 | Ford Global Technologies, Llc | Systems and methods for inferring barometric pressure |
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| JP2006009594A (en) * | 2004-06-22 | 2006-01-12 | Denso Corp | Air supply device |
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