CN107420230B - Carbon tank high-load desorption pipeline desorption flow diagnosis method - Google Patents
Carbon tank high-load desorption pipeline desorption flow diagnosis method Download PDFInfo
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- CN107420230B CN107420230B CN201710813257.2A CN201710813257A CN107420230B CN 107420230 B CN107420230 B CN 107420230B CN 201710813257 A CN201710813257 A CN 201710813257A CN 107420230 B CN107420230 B CN 107420230B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
- F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
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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
- F02D41/22—Safety or indicating devices for abnormal conditions
- F02D2041/224—Diagnosis of the fuel system
- F02D2041/225—Leakage detection
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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
Abstract
The invention relates to the field of vehicle emission, in particular to a diagnosis method of an emission system. A method for diagnosing desorption flow of a high-load desorption pipeline of a carbon tank comprises the steps of selecting a vehicle with a complete desorption pipeline as a standard vehicle, starting the vehicle, opening an electromagnetic valve of the carbon tank, and closing a stop valve of the carbon tank; waiting for a certain time to obtain the vacuum degree in the oil tank; a function of vacuum and remaining fuel quantity at each remaining fuel quantity tested repeatedly; when the vehicle actually runs for diagnosis, the high-load desorption pipeline is diagnosed by comparing the actual residual fuel quantity and the function with the actual vacuum degree after the vacuum degree threshold value is obtained. In step S1, the vehicle is started to keep the vehicle in an idling state. The invention uses the existing sensor and actuator to finish the diagnosis of the desorption flow of the high-load desorption pipeline, and does not need to install a pressure sensor on a Venturi tube, thereby not only reducing the cost, but also simplifying the wiring harness arrangement matched with the sensor, simplifying the system structure and more meeting the light weight requirement of compact vehicle models.
Description
Technical Field
The invention relates to the field of vehicle emission, in particular to a diagnosis method of an emission system.
Background
With the upgrade of emission regulations from five countries to six countries, the technical requirements on the evaporation system are increasing day by day, and the requirements mainly comprise the following points: 1) diagnosing leakage of a newly added fuel system; 2) tightened evaporative emissions control requirements; 3) newly adding emission control requirements in the refueling process; 4) newly adding diagnosis for the desorption flow of the carbon tank desorption pipeline;
as shown in fig. 1, in a vehicle equipped with a gasoline engine, in particular, a vehicle equipped with a supercharger engine, two canister desorption lines are usually provided, one of which is connected to an intake manifold 7 via a canister solenoid 3, i.e., a so-called low-load desorption line 12, and when the gas pressure in the intake manifold 7 is lower than the atmospheric pressure, the canister desorption is performed via the low-load desorption line 12. And the other desorption pipeline is connected to the downstream of the air filter 5 of the air inlet pipeline through a carbon tank electromagnetic valve 3, namely a high-load desorption pipeline 11, and when the gas pressure in the air inlet manifold 7 and the gas pressure in a pipeline 10 upstream of a throttle valve of the air inlet manifold 7 are higher than the atmospheric pressure, carbon tank desorption can be carried out through the high-load desorption pipeline 11. The two desorption pipelines are connected to the carbon tank through a main pipe. Meanwhile, in order to increase the effect of desorption in the high-load desorption line 11, that is, to increase the desorption flow rate flowing through the high-load desorption line as much as possible, the venturi tube 4 is generally installed to increase the desorption flow rate. When the gas pressure in the intake manifold 7 and the gas pressure in the pipeline 10 upstream of the throttle valve of the intake manifold 7 are higher than the atmospheric pressure, air flows are formed at the B end and the C end of the Venturi tube, so that the Venturi effect is induced at the A end of the Venturi tube, and a relatively low negative pressure is formed;
in the prior art, a pipeline pressure sensor 8 is generally required to be arranged at the end A of a Venturi tube 4, a carbon tank electromagnetic valve 3 is opened during detection, and the negative pressure state of the pipeline pressure sensor 8 is diagnosed for judgment when a carbon tank stop valve 6 is closed; although the judgment mode is reliable, the internal space of the vehicle is limited, the number of electrical equipment is not large, the additionally arranged pipeline pressure sensor 8 also has the problems of interference, sealing, safety and the like of wiring, the requirement of light weight of the vehicle is not facilitated, and the cost of the whole vehicle is further increased.
Disclosure of Invention
The invention aims to solve the technical problem of providing a carbon tank high-load desorption pipeline desorption flow diagnosis method, which uses the existing sensors and actuators to finish the diagnosis of the desorption flow of the high-load desorption pipeline, does not need to install a pipeline pressure sensor near the inlet A of a Venturi tube, not only reduces the cost, but also simplifies the wiring harness arrangement matched with the sensors, simplifies the system structure and meets the light weight requirement of compact vehicle models.
The invention is realized by the following steps: a method for diagnosing desorption flow of a carbon tank high-load desorption pipeline,
selecting a vehicle with a complete desorption pipeline as a standard vehicle, and performing the following steps:
s1, starting a vehicle, simultaneously opening a carbon tank electromagnetic valve, and closing a carbon tank stop valve;
s2, waiting for a certain time until the pressure of an oil tank is equal to the pressure of the A end of the Venturi tube;
s3, reading data of an oil tank pressure sensor in the oil tank to obtain the vacuum degree P in the oil tank;
s4, fitting the obtained data after steps S2 and S3 are repeated by taking the residual fuel quantity L of the oil tank as a variable to obtain a function P = f (L) of the vacuum degree P and the residual fuel quantity L;
s5, reading the actual vacuum degree value P in the oil tank when the vehicle actually runs for diagnosisFruit of Chinese wolfberryAnd the actual remaining fuel amount LFruit of Chinese wolfberryIs prepared by mixing LFruit of Chinese wolfberrySubstituting the function P = f (l) to obtain PThreshold(s)；
When P is presentFruit of Chinese wolfberry≥PThreshold(s)Judging that the high-load desorption pipeline is connected perfectly;
when P is presentFruit of Chinese wolfberry＜PThreshold(s)And judging that the high-load desorption pipeline is leaked or disconnected.
In step S1, the vehicle is started to keep the vehicle in an idling state.
In step S3, if the tank pressure sensor is an absolute pressure sensor, the vacuum degree P = P0-P1，P0Is ambient pressure, P1The pressure of the oil tank measured by the oil tank pressure sensor.
In step S5, when the vehicle running speed exceeds 20Km/h, no diagnosis is made.
Before step S1, a step of determining a blockage is included, which includes starting the vehicle, closing the canister solenoid valve, opening the canister stop valve, waiting for a certain period of time, reading data from a tank pressure sensor in the tank, and comparing the data with ambient pressure, such as tank pressure P obtained from the tank pressure sensor1= ambient pressure P0If the pressure sensor and/or the gas circuit of the oil tank are normal, the oil tank pressure sensor and/or the gas circuit of the oil tank are/is indicated to be normal; e.g. tank pressure P1Not equal to atmospheric pressure P0And if the pressure sensor of the oil tank is damaged and/or the air passage of the oil tank is blocked, the maintenance is required.
Setting a barometric pressure threshold PIs provided withE.g. tank pressure P1∈（P0±PIs provided with) Then, consider P1=P0。
According to the carbon tank high-load desorption pipeline desorption flow diagnosis method, the existing sensor and the existing actuator are used for completing the diagnosis of the desorption flow of the high-load desorption pipeline, and a pipeline pressure sensor is not required to be installed near the inlet A of the Venturi tube, so that the cost is reduced, meanwhile, the wiring harness arrangement matched with the sensor is simplified, the system structure is simplified, and the light weight requirement of a compact vehicle type is met.
Drawings
FIG. 1: the prior art carries out a desorption system pipeline diagram for diagnosing high-load desorption flow;
FIG. 2: the invention discloses a desorption system pipeline diagram of a carbon tank high-load desorption pipeline desorption flow diagnosis method.
In the figure: the device comprises an oil tank 1, a carbon tank 2, a carbon tank 3, an electromagnetic valve, a venturi tube 4, an air inlet pipeline 5, a carbon tank stop valve 6, an air inlet manifold 7, a pipeline pressure sensor 8, an oil tank pressure sensor 9, a throttle valve upstream pipeline 10, a high-load desorption pipeline 11 and a low-load desorption pipeline 12.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that various changes and modifications can be made by one skilled in the art after reading the description of the present invention, and equivalents fall within the scope of the invention defined by the appended claims.
Examples
As shown in fig. 2, a method for diagnosing desorption flow of a high-load desorption pipeline of a carbon tank,
selecting a vehicle with a complete desorption pipeline as a standard vehicle,
firstly, a standard vehicle is checked, the specific checking mode is that the vehicle is started, the carbon tank electromagnetic valve 3 is closed, the carbon tank stop valve 6 is opened, no air current flows through the venturi tube 4 through the oil tank 1 at the moment, the oil tank 1 and the carbon tank 2 are communicated with the atmosphere, after a certain time, data of an oil tank air pressure sensor 9 in the oil tank 1 are read and then are compared with the ambient pressure, for example, the oil tank pressure P obtained from the oil tank air pressure sensor 91= ambient pressure P0If so, the oil tank air pressure sensor 9 and/or the oil tank air passage are/is normal; e.g. tank pressure P1Not equal to atmospheric pressure P0If the vehicle is not used as a standard vehicle, the vehicle needs to be replaced;
in the present embodiment, the air pressure threshold value P is set in consideration of the test errorThreshold(s)E.g. tank pressure P1∈（P0±PThreshold(s)) Then, consider P1=P0；
Then the method comprises the following steps:
s1, starting a vehicle, simultaneously opening a carbon tank electromagnetic valve 3, and closing a carbon tank stop valve 6; the desorption gas flow flows into the downstream of the air filter 5 of the air inlet pipeline through the high-load desorption pipeline 11 from the oil tank 1 through the carbon tank 2;
s2, waiting for a certain time until the pressure of an oil tank is equal to the pressure of the A end of the Venturi tube; when the pressure is stable, a certain vacuum degree can be formed in the oil tank 1 because the oil tank 1 and the carbon tank 2 are relatively sealed;
s3, reading data of an oil tank pressure sensor 9 in the oil tank 1 to obtain the vacuum degree P in the oil tank 1; at this time, the process of the present invention,
if the oil tank air pressure sensor 9 is a relative pressure sensor, the numerical value can directly reflect the vacuum degree in the oil tank;
if the oil tank air pressure sensor 9 is an absolute pressure sensor, the vacuum degree P = P0-P1，P0Is ambient pressure, P1The pressure of the oil tank measured by the oil tank pressure sensor 9;
s4, fitting the obtained data after steps S2 and S3 are repeated by taking the residual fuel quantity L of the oil tank 1 as a variable to obtain a function P = f (L) of the vacuum degree P and the residual fuel quantity L;
s5, reading the actual vacuum degree value P in the oil tank 1 when the vehicle actually runs for diagnosisFruit of Chinese wolfberryAnd the actual remaining fuel amount LFruit of Chinese wolfberryIs prepared by mixing LFruit of Chinese wolfberrySubstituting the function P = f (l) to obtain PThreshold(s)；
When P is presentFruit of Chinese wolfberry≥PThreshold(s)When the high-load desorption pipeline 11 is connected well, judging that the high-load desorption pipeline 11 is connected well;
when P is presentFruit of Chinese wolfberry＜PThreshold(s)When the leakage is judged to exist in the high-load desorption pipeline 11 orAnd (5) disconnecting.
In the present embodiment, in consideration of the actual operating condition of the vehicle, preferably, in step S1, the vehicle is started to keep the vehicle in the idle state for the subsequent calibration test; also, in practical use, when the vehicle running speed exceeds 20Km/h, the diagnosis is not performed in step S5, and the diagnosis method of the present invention is adopted only under the idle speed and low speed conditions to ensure the reliability of the result.
Claims (5)
1. A carbon tank high-load desorption pipeline desorption flow diagnosis method is characterized in that,
selecting a vehicle with a complete desorption pipeline as a standard vehicle, and performing the following steps:
s1, starting a vehicle, simultaneously opening a carbon tank electromagnetic valve (3), and closing a carbon tank stop valve (6);
s2, waiting for a certain time until the pressure of an oil tank is equal to the pressure of the A end of the Venturi tube;
s3, reading data of an oil tank air pressure sensor (9) in the oil tank (1) to obtain the vacuum degree P in the oil tank (1);
s4, taking the residual fuel quantity L of the oil tank (1) as a variable, repeating the steps S2 and S3, and fitting the obtained data to obtain a function P = f (L) of the vacuum degree P and the residual fuel quantity L;
s5, reading the actual vacuum degree value P in the oil tank (1) when the vehicle actually runs for diagnosisFruit of Chinese wolfberryAnd the actual remaining fuel amount LFruit of Chinese wolfberryIs prepared by mixing LFruit of Chinese wolfberrySubstituting the function P = f (l) to obtain PThreshold(s)；
When P is presentFruit of Chinese wolfberry≥PThreshold(s)When the high-load desorption pipeline (11) is connected well, judging that the high-load desorption pipeline is connected well;
when P is presentFruit of Chinese wolfberry＜PThreshold(s)Judging that the high-load desorption pipeline (11) leaks or is disconnected;
before the step S1, the method further comprises a step of judging blockage, specifically includes starting the vehicle, closing the carbon tank electromagnetic valve (3), opening the carbon tank stop valve (6), reading data of a fuel tank air pressure sensor (9) in the fuel tank (1) after waiting for a certain time, and comparing the data with the ambient pressure, such as the fuel tank pressure P obtained from the fuel tank air pressure sensor (9)1= ambient pressure P0If so, the oil tank air pressure sensor (9) and/or the oil tank air passage are/is normal; e.g. tank pressure P1Not equal to atmospheric pressure P0And if the pressure sensor (9) of the oil tank is damaged and/or the air passage of the oil tank is blocked, the oil tank needs to be overhauled.
2. The method for diagnosing the desorption flow of the high-load desorption pipeline of the carbon tank as claimed in claim 1, which is characterized in that: in step S1, the vehicle is started to keep the vehicle in an idling state.
3. The method for diagnosing the desorption flow of the high-load desorption pipeline of the carbon tank as claimed in claim 1, which is characterized in that: in step S3, if the tank pressure sensor (9) is an absolute pressure sensor, the degree of vacuum P = P0-P1，P0Is ambient pressure, P1The pressure of the oil tank is measured by an oil tank pressure sensor (9).
4. The method for diagnosing the desorption flow of the high-load desorption pipeline of the carbon tank as claimed in claim 1, which is characterized in that: in step S5, when the vehicle running speed exceeds 20Km/h, no diagnosis is made.
5. The method for diagnosing the desorption flow of the high-load desorption pipeline of the carbon tank as claimed in claim 1, which is characterized in that: setting a barometric pressure threshold PIs provided withE.g. tank pressure P1∈（P0±PIs provided with) Then, consider P1=P0。
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| CN201710813257.2A CN107420230B (en) | 2017-09-11 | 2017-09-11 | Carbon tank high-load desorption pipeline desorption flow diagnosis method |
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| CN107830965A (en) * | 2017-12-06 | 2018-03-23 | 武汉飞恩微电子有限公司 | A kind of automobile canister desorption system pressure sensor |
| CN108952961B (en) * | 2018-06-29 | 2019-11-22 | 联合汽车电子有限公司 | Internal combustion engine hydrocarbon emission leakage monitoring structure and its monitoring method |
| CN109445408B (en) * | 2018-10-22 | 2021-02-05 | 重庆长安汽车股份有限公司 | Method for measuring real-time desorption flow of automobile carbon canister |
| CN109441671B (en) * | 2018-10-26 | 2020-06-23 | 安徽江淮汽车集团股份有限公司 | Diagnosis system and method for low-desorption pipeline of engine |
| CN110131060B (en) * | 2019-05-22 | 2022-04-08 | 浙江吉利控股集团有限公司 | Carbon tank control method and carbon tank control device |
| CN110823591A (en) * | 2019-10-16 | 2020-02-21 | 黄山市徽州和顺实业有限公司 | Detection system for desorption flow of high-load pipeline of automobile carbon tank |
| CN111075610B (en) * | 2019-12-11 | 2021-09-21 | 义乌吉利动力总成有限公司 | Carbon tank desorption pipeline flow diagnosis method and system |
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| CN114645805B (en) * | 2020-12-18 | 2023-06-23 | 长城汽车股份有限公司 | Vehicle engine control method and device and vehicle |
| CN112834240A (en) * | 2020-12-31 | 2021-05-25 | 苏州恩都模塑科技有限公司 | Leakage desorption flow test detection system |
| CN113976090A (en) * | 2020-12-31 | 2022-01-28 | 苏州开洛泰克科学仪器科技有限公司 | Centralized self-diagnosis vacuum desorption device and use method thereof |
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| CN114263550B (en) * | 2021-09-29 | 2023-06-02 | 联合汽车电子有限公司 | Desorption diagnosis method and device for hybrid electric vehicle, medium, monitor and vehicle |
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