CN113775440A - Fuel evaporation control system - Google Patents
Fuel evaporation control system Download PDFInfo
- Publication number
- CN113775440A CN113775440A CN202111263570.6A CN202111263570A CN113775440A CN 113775440 A CN113775440 A CN 113775440A CN 202111263570 A CN202111263570 A CN 202111263570A CN 113775440 A CN113775440 A CN 113775440A
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- Prior art keywords
- fuel
- valve
- pressure
- tank
- engine
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- 239000000446 fuel Substances 0.000 title claims abstract description 88
- 230000008020 evaporation Effects 0.000 title claims abstract description 27
- 238000001704 evaporation Methods 0.000 title claims abstract description 27
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 58
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 56
- 239000002828 fuel tank Substances 0.000 claims abstract description 47
- 238000003795 desorption Methods 0.000 claims description 21
- 239000000945 filler Substances 0.000 claims description 2
- 238000001514 detection method Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000003912 environmental pollution Methods 0.000 description 3
- 230000008602 contraction Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 238000003915 air pollution Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
Images
Classifications
-
- 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
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- 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)
Abstract
The invention provides a fuel evaporation control system, which is used for realizing vapor leakage detection in the fuel evaporation control system. This fuel evaporation control system includes: an engine electronic control unit ECU; a venturi tube; the air filter, the supercharger and the engine are sequentially communicated; the fuel tank, the carbon canister assembly and the carbon canister control valve are communicated in sequence; a canister shutoff valve and an ash filter in communication with the canister assembly; the carbon canister control valve is connected with the first end of the Venturi tube through a pipeline and a first one-way valve, the second end of the Venturi tube is communicated between the supercharger and the engine, and the outlet end of the Venturi tube is communicated between the air filter and the supercharger; the carbon tank control valve is also communicated to the back of a throttle valve of the engine through a second one-way valve and a related pipeline.
Description
Technical Field
The invention relates to a vehicle fuel system, in particular to a fuel evaporation control system.
Background
At present, the quantity of retained automobiles in China is more and more, pollutants discharged by the whole automobile have greater and greater influence on the environment, become an important source of air pollution in China, and are the main reasons for causing haze and photochemical smog pollution. Some of the emissions are from hydrocarbons vaporized in the fuel system or leaking into the atmosphere (known as evaporative emissions). With the official implementation of the national emission standards of six, the leakage detection of the fuel vapor in the fuel evaporation control system is required.
Disclosure of Invention
The invention provides a fuel evaporation control system, which is used for realizing leakage detection of steam in the fuel evaporation control system.
The technical scheme of the invention is as follows:
the invention provides a fuel evaporation control system, comprising: an engine electronic control unit ECU; a venturi tube; the air filter, the supercharger and the engine are sequentially communicated; the fuel tank, the carbon canister assembly and the carbon canister control valve are communicated in sequence; a canister shutoff valve and an ash filter in communication with the canister assembly;
the carbon canister control valve is connected with the first end of the Venturi tube through a first one-way valve, the second end of the Venturi tube is communicated between the supercharger and the engine, and the outlet end of the Venturi tube is communicated between the air filter and the supercharger;
the carbon tank control valve is also communicated to the back of a throttle valve of the engine through a second one-way valve;
when determining that the vehicle meets the fuel vapor desorption condition, the ECU controls the carbon canister control valve to start, fuel vapor in the fuel tank enters the carbon canister assembly through a pipeline, and air entering through the ash filter enters the carbon canister assembly after passing through the carbon canister stop valve;
when the pressure behind a throttle valve of an engine is higher than the pressure behind the air filter, the first check valve is opened, the second check valve is closed, and after the fuel vapor stored in the carbon canister assembly passes through the carbon canister control valve, the first check valve, the venturi tube and the supercharger, a part of the fuel vapor blows the fuel vapor entering from the first end of the venturi tube through the second end of the venturi tube to flow out of a rear end pipeline of the air filter from an outlet of the venturi tube to participate in gas circulation; another part of the fuel vapor enters the engine through a throttle valve of the engine to be combusted;
when the pressure behind a throttle valve of the engine is lower than the pressure behind the air filter, the second check valve is opened, the first check valve is closed, and air and fuel vapor are mixed in the carbon canister assembly and then enter the engine through the carbon canister control valve and the second check valve to be combusted.
Preferably, a high-pressure desorption pressure sensor is arranged in a pipeline between the carbon canister control valve and the air filter;
after the vehicle is started, the ECU compares a first pressure detected by the high-pressure desorption pressure sensor within a preset time with a first preset pressure, and when the difference value between the first pressure and the first preset pressure exceeds a first preset range, the fact that steam leakage exists in a pipeline between the carbon canister control valve and the air filter is determined.
Preferably, a mixing valve is arranged in a pipeline between the desorption pipe and the carbon tank assembly of the fuel tank;
when the vehicle is not started, the carbon tank stop valve is in a normally open state; when the fuel vapor pressure in the fuel tank exceeds the opening pressure of the mixing valve, the fuel vapor is released to the atmosphere after passing through the mixing valve, the carbon canister assembly, the carbon canister stop valve and the ash filter; when the fuel vapor pressure in the fuel tank is reduced to be less than the atmospheric pressure, air enters the fuel tank after passing through the ash filter, the carbon canister stop valve, the carbon canister assembly and the mixing valve.
Preferably, the oil filling pipe and the desorption pipe of the fuel tank are communicated through a pipeline;
when the fuel tank is refueled through a fuel filling pipe of the fuel tank, the carbon tank stop valve is in a normally open state, fuel vapor in one part of the fuel tank overflows from the desorption pipe and then flows back into the fuel tank through the pipeline and the fuel filling pipe, and fuel vapor in the other part of the fuel tank is released into the atmosphere through the mixing valve, the carbon tank assembly, the carbon tank stop valve and the ash filter.
Preferably, a fuel tank pressure sensor for detecting fuel vapor pressure of a fuel tank is arranged in a pipeline between the mixing valve and the carbon canister assembly, and the fuel tank pressure sensor is connected with an electronic control unit ECU of the engine.
Preferably, after the vehicle is started, the carbon canister stop valve is closed, the electronic control unit ECU controls the carbon canister control valve to be opened, negative pressure of the engine air inlet system is extracted within a preset time, if the difference value between the extracted negative pressure value and the preset negative pressure value is within a second preset range, it is determined that the fuel evaporation control system does not leak, and if not, leakage exists;
and the extracted negative pressure of the air intake system of the engine represents the vacuum degree of the fuel evaporation control system.
The invention has the beneficial effects that:
the control of fuel evaporative emission is realized by depending on the working capacity of the activated carbon canister, and meanwhile, the pressure of fuel vapor is monitored by a sensor and a controller, and whether the leakage exists in the whole fuel vapor channel or not is detected on line. The system can effectively reduce the environmental pollution caused by the volatilization of the fuel vapor and avoid the vapor leakage caused by the untight sealing of the fuel vapor pipeline.
Drawings
FIG. 1 is a front view of a system in an embodiment of the invention;
FIG. 2 is a fuel vapor flow diagram during refueling in the embodiment of the invention;
FIG. 3 is a fuel vapor trend diagram for increasing pressure in the fuel tank in an embodiment of the present invention;
FIG. 4 is a schematic view of the air flow when the pressure in the fuel tank is reduced in the embodiment of the present invention;
FIG. 5 is a desorption and orientation diagram of fuel vapor in the embodiment of the invention;
1-fuel tank, 2-mixing valve, 3-fuel filling pipe, 4-fuel tank pressure sensor, 5-canister assembly, 6-canister control valve, 7-first one-way valve, 8-high pressure desorption pressure sensor, 9-Venturi tube, 10-air filter, 11-supercharger, 12-throttle valve, 13-engine, 14-second one-way valve, 15-canister stop valve and 16-ash filter.
Detailed Description
Referring to fig. 1, the fuel evaporation control system of the invention comprises an electronic control unit ECU of an engine, a fuel tank 1, a mixing valve 2, a fuel filling pipe 3, a fuel tank pressure sensor 4, a carbon canister assembly 5, a carbon canister control valve 6, a first one-way valve 7, a high-pressure desorption pressure sensor 8, a Venturi tube 9, an air filter 10, a supercharger 11, a throttle valve 12, an engine 13, a second one-way valve 14, a carbon canister stop valve 15 and an ash filter 16. The electronic control unit ECU of the engine controls the opening and closing of the carbon canister control valve 6, and meanwhile, the electronic control unit ECU of the engine is connected with the high-pressure desorption pressure sensor 8 and the oil tank pressure sensor 4 and used for receiving the pressures detected by the two sensors.
Referring to fig. 1, when the vehicle is started, the fuel evaporation system performs leak diagnosis. At this time, the canister cut-off valve 15 is closed, and the engine electronic control unit ECU controls the canister control valve 6 to be opened. The vacuum degree of the fuel evaporation system is extracted by using the vacuum degree of the fuel tank pressure sensor to the negative pressure of the engine air inlet system, and if the negative pressure can be established and stabilized at a preset negative pressure value in a preset time (specifically, the difference value between the extracted negative pressure and the preset negative pressure value is in a second preset range), the fuel evaporation control system is free from leakage. If the established negative pressure is not stabilized at the preset negative pressure value or the negative pressure cannot be established, the situation that the fuel evaporation control system leaks is indicated, the engine fault is reported on a vehicle instrument when the leakage situation occurs, the whole fuel evaporation control system needs to be checked, the problem point is judged and maintained, and the fuel vapor is prevented from being directly released into the atmosphere to cause environmental pollution.
Referring to fig. 1, the high-pressure desorption pressure sensor 8 is configured to detect a pressure between the canister control valve 6 and the air pipe of the air filter 10, and if the ECU determines that a difference between a first pressure detected by the high-pressure desorption pressure sensor 8 and a first preset pressure value exceeds a first preset range, it indicates that the air pipe between the canister control valve 6 and the air filter 10 is leaked, and related pipelines and parts need to be checked and replaced or repaired to prevent fuel vapor from being directly released into the atmosphere to cause environmental pollution.
Referring to fig. 2, when the vehicle is being refueled, the volume of fuel in the fuel tank 1 increases, fuel vapor is compressed and flows outward, and a portion of the fuel vapor returns to a position near the fuel filler neck 3 of the fuel tank 1 through the mixing valve 2 and associated piping, and participates in fuel vapor recirculation. The remaining part of the fuel vapor passes through the canister assembly 5 through the mixing valve 2 and related piping, and the harmless gas adsorbed and filtered by the canister assembly 5 passes through the canister shutoff valve 15 and related piping and is released to the atmosphere through the ash filter 16.
Referring to fig. 3, in a state where the vehicle is not started, when the pressure in the fuel tank 1 increases (for example, due to thermal expansion and contraction after heating in summer), and the fuel vapor pressure becomes higher than the pressure value of the mixing valve 2, the fuel vapor flows to the canister assembly 5 through the mixing valve 2 and the related piping, and the harmless gas adsorbed and filtered by the canister assembly 5 passes through the canister shutoff valve 15 and the related piping and is released to the atmosphere through the ash filter 16. The fuel tank 1 is prevented from being partially leaked due to excessive pressure of the fuel tank 1, and fuel vapor and fuel are prevented from being released into the atmosphere.
Referring to fig. 4, in a state where the vehicle is not started, when the pressure in the fuel tank 1 decreases (for example, due to thermal expansion and contraction or due to fuel usage in the fuel tank when the vehicle is started in cold weather), the fuel vapor pressure becomes low, and air enters the canister assembly 5 after being primarily filtered by the ash filter 16, enters the fuel tank 1 after being filtered again by the canister assembly 5, and compensates for the pressure decrease in the fuel tank 1. Prevent the fuel tank 1 from reducing the internal pressure too much, cause the leakproofness to reduce, produce and leak.
Referring to fig. 5, when the fuel evaporation control system detects that the vehicle satisfies the desorption condition after the vehicle is started, the ECU controls the canister control valve 6 to open, air is primarily filtered by the ash filter 16, flows into the desorption pipe through the canister assembly 5, and brings fuel vapor in the canister assembly 5 into the engine 13 to be combusted. At the same time, part of the fuel vapor in the fuel tank 1 will also flow through the mixing valve 2, the tank pressure sensor 4, through the canister assembly 5 to the desorption pipe, and be combusted as air entering the canister assembly 5 enters the engine 13. Meanwhile, the air filtered by the ash filter 16 can flush away the fuel oil adsorbed in the carbon canister assembly 5, and the adsorption capacity of the carbon canister assembly 5 is recovered.
Referring to fig. 5, when the pressure behind the throttle valve 12 is lower than the pressure behind the air filter 10 after the vehicle starts, the second check valve 14 opens, the first check valve 7 closes, and fuel vapor is sucked into the engine 13 under negative pressure and burned. When the pressure behind the throttle valve 12 is higher than the pressure at the rear end of the air filter 10, the first one-way valve 7 is opened, the second one-way valve 14 is closed, and the fuel vapor passes through the venturi tube 9 under the action of high-pressure air to increase the desorption flow, passes through a supercharger and related pipelines, and enters the engine 13 to be combusted.
Claims (6)
1. A fuel evaporation control system, comprising: an engine electronic control unit ECU; a venturi tube (9); an air filter (10), a supercharger (11) and an engine (13) which are communicated in sequence; the fuel tank (1), the carbon canister assembly (5) and the carbon canister control valve (6) are communicated in sequence; a canister shutoff valve (15) and an ash filter (16) in communication with the canister assembly (5);
the carbon tank control valve (6) is connected with a first end of the Venturi tube (9) through a first one-way valve (7), a second end of the Venturi tube (9) is communicated between the supercharger (11) and the engine (13), and an outlet end of the Venturi tube (9) is communicated between the air filter (10) and the supercharger (11);
the canister control valve (6) is also communicated behind a throttle valve (12) of the engine (13) through a second one-way valve (14);
when determining that the vehicle meets the fuel vapor desorption condition, the ECU controls the carbon tank control valve (6) to start, fuel vapor in the fuel tank (1) enters the carbon tank assembly (5) through a pipeline, and air entering through the ash filter (16) enters the carbon tank assembly (5) after passing through the carbon tank stop valve (15);
when the pressure behind a throttle valve (12) of an engine (13) is higher than the pressure behind the air filter (10), the first one-way valve (7) is opened, the second one-way valve (14) is closed, and after the fuel vapor stored in the carbon canister assembly (5) passes through the carbon canister control valve (6), the first one-way valve (7), the venturi tube (9) and the supercharger (11), a part of the fuel vapor blows the fuel vapor entering from the first end of the venturi tube (9) through the second end of the venturi tube (9) to flow out of a pipeline at the rear end of the air filter (10) from the outlet of the venturi tube (9) to participate in gas circulation; another part of the fuel vapor enters the engine (13) through a throttle valve (12) of the engine (13) to be combusted;
when the pressure behind a throttle valve (12) of an engine (13) is lower than the pressure behind the air filter (10), the second one-way valve (14) is opened, the first one-way valve (7) is closed, and air and fuel vapor are mixed in the carbon canister assembly (5), then enter the engine (13) through the carbon canister control valve (6) and the second one-way valve (14) and are combusted.
2. A fuel evaporation control system according to claim 1, characterized in that a high-pressure desorption pressure sensor (8) is arranged in a line between the canister control valve (6) and the air filter (10);
after the vehicle is started, the ECU of the engine compares a first pressure detected by the high-pressure desorption pressure sensor (8) in a preset time with a first preset pressure, and when the difference value between the first pressure and the first preset pressure exceeds a first preset range, the fact that steam leakage exists in a pipeline between the carbon canister control valve (6) and the air filter (10) is determined.
3. A fuel evaporation control system according to claim 1, wherein a mixing valve (2) is provided in a piping between a desorption pipe of the fuel tank (1) and the canister assembly (5);
when the vehicle is not started, the carbon tank stop valve (15) is in a normally open state; when the fuel vapor pressure in the fuel tank (1) exceeds the opening pressure of the mixing valve (2), the fuel vapor is released to the atmosphere after passing through the mixing valve (2), the carbon canister assembly (5), the carbon canister stop valve (15) and the ash filter (16); when the fuel vapor pressure in the fuel tank (1) is reduced to be less than the atmospheric pressure, air enters the fuel tank (1) after passing through the ash filter (16), the carbon canister stop valve (15), the carbon canister assembly (5) and the mixing valve (2).
4. A fuel evaporation control system as claimed in claim 3, wherein the filler pipe (3) and the detachment pipe of the fuel tank (1) communicate with each other through a pipe;
when the fuel tank (1) is refueled through the fuel filling pipe (3) of the fuel tank (1), the carbon tank stop valve (15) is in a normally open state, fuel vapor in one part of the fuel tank (1) overflows from the desorption pipe and then flows back to the fuel tank (1) through the pipeline and the fuel filling pipe (3), and fuel vapor in the other part of the fuel tank (1) is released into the atmosphere through the mixing valve (2), the carbon tank assembly (5), the carbon tank stop valve (15) and the ash filter (16).
5. A fuel evaporation control system according to claim 3, wherein a tank pressure sensor (4) that detects the fuel vapor pressure of the fuel tank (1) is disposed in a line between the mixing valve (2) and the canister assembly (5), and the tank pressure sensor (4) is connected to an engine electronic control unit ECU.
6. The fuel evaporation control system according to claim 1, characterized in that when the vehicle is started, the canister cut-off valve (15) is closed, the engine electronic control unit ECU controls the canister control valve (6) to open, negative pressure of the intake system of the engine (13) is extracted within a preset time, if a difference between the extracted negative pressure value and a preset negative pressure value is within a second preset range, it is determined that there is no leakage in the fuel evaporation control system, otherwise there is leakage;
wherein the extracted intake system negative pressure of the engine (13) is indicative of a vacuum level of the fuel evaporation control system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111263570.6A CN113775440A (en) | 2021-10-28 | 2021-10-28 | Fuel evaporation control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111263570.6A CN113775440A (en) | 2021-10-28 | 2021-10-28 | Fuel evaporation control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113775440A true CN113775440A (en) | 2021-12-10 |
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ID=78873536
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111263570.6A Withdrawn CN113775440A (en) | 2021-10-28 | 2021-10-28 | Fuel evaporation control system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113775440A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114718774A (en) * | 2022-04-13 | 2022-07-08 | 安阳工学院 | Device for improving oil gas recovery efficiency in fuel oil system and control method |
-
2021
- 2021-10-28 CN CN202111263570.6A patent/CN113775440A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114718774A (en) * | 2022-04-13 | 2022-07-08 | 安阳工学院 | Device for improving oil gas recovery efficiency in fuel oil system and control method |
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Application publication date: 20211210 |
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| WW01 | Invention patent application withdrawn after publication |