CN114542334A - Method and mechanism for judging coarse leakage of automobile evaporation system and automobile - Google Patents
Method and mechanism for judging coarse leakage of automobile evaporation system and automobile Download PDFInfo
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- CN114542334A CN114542334A CN202210177327.0A CN202210177327A CN114542334A CN 114542334 A CN114542334 A CN 114542334A CN 202210177327 A CN202210177327 A CN 202210177327A CN 114542334 A CN114542334 A CN 114542334A
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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
- F02M25/0809—Judging failure of purge control system
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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 a method and a mechanism for judging coarse leakage of an automobile evaporation system and an automobile, wherein the judging method is S1: judging whether a coarse leakage test is carried out or not based on the vehicle speed and the working states of the carbon tank stop valve and the carbon tank electromagnetic valve, and if so, entering S2; if not, exiting; s2: judging whether coarse leakage exists, if so, entering S3, otherwise, exiting; s3: judging whether to continue a coarse leakage test or not based on the vehicle speed and the working states of the carbon tank stop valve and the carbon tank electromagnetic valve, if so, entering S4, and if not, exiting; s4: it is determined whether a coarse leak exists. The invention aims at the scheme that the evaporation system carries out coarse leakage diagnosis under the idling condition, adopts a secondary diagnosis method, can eliminate or reduce the false alarm of coarse leakage fault when negative pressure is not established in time under the idling condition due to accidental clamping stagnation or opening delay of a carbon canister electromagnetic valve, and can improve the diagnosis robustness of the low-cost scheme of the idling coarse leakage diagnosis.
Description
Technical Field
The invention relates to the technical field of engines, in particular to a fuel system technology.
Background
For vehicles with evaporative emission requirements, the national six-emission regulations require that the integrity of the whole system of an evaporative system except for a pipeline and a joint between a carbon tank electromagnetic valve and an engine intake manifold is monitored, and when the leakage rate of a leakage point is greater than or equal to that of a small hole with the diameter of 1mm, a fault needs to be diagnosed. In order to meet the requirements of regulations, an economical scheme in the industry at present is an idle speed vacuumizing pressure maintaining method. When the negative pressure detected by the oil tank pressure sensor reaches a set value, the carbon tank electromagnetic valve is closed, so that an evaporation system part formed by the carbon tank electromagnetic valve, an oil tank cover and the carbon tank stop valve is in a closed space, if leakage exists, the atmospheric pressure in the closed space can rise, and when the change rate of the pressure exceeds the set value, the fault of 1mm is judged. When the method is used for judging 1mm leakage, the premise is that when the vehicle is idling, after the carbon tank stop valve is closed and the carbon tank electromagnetic valve is opened according to the target set duty ratio, the negative pressure in the evaporation system can successfully reach the set target value. If the negative pressure in the evaporation system does not reach the set target value within a certain time, the system judges that leakage larger than 1mm leakage exists, and the leakage is called coarse leakage. In the course of rough leakage determination, due to the influence of loose parts or impurities of the carbon canister electromagnetic valve, the carbon canister electromagnetic valve is occasionally stuck or opened for a delay, the actual evaporation desorption flow is low, the negative pressure in the evaporation system is slowly established, the establishment of the negative pressure cannot be completed within a set time, the system can falsely report a rough leakage fault, and the robustness of rough leakage idling diagnosis is reduced.
Disclosure of Invention
One of the purposes of the invention is to provide a method for judging the coarse leakage of an automobile evaporation system, so as to solve the problem that the robustness of leakage diagnosis is reduced due to the influence of accidental clamping stagnation or opening delay of a carbon canister electromagnetic valve; the second purpose is to provide a rough leakage judging mechanism of the automobile evaporation system; the third purpose is to provide an automobile.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a method for judging the coarse leakage of an automobile evaporation system is characterized by comprising the following steps:
s1: judging whether a coarse leakage test is carried out or not based on the vehicle speed and the working states of the carbon tank stop valve and the carbon tank electromagnetic valve, and if so, entering S2; if not, exiting;
s2: judging whether coarse leakage exists, if so, entering S3, otherwise, exiting;
s3: judging whether to continue a coarse leakage test or not based on the vehicle speed and the working states of the carbon tank stop valve and the carbon tank electromagnetic valve, if so, entering S4, and if not, exiting;
s4: it is determined whether a coarse leak exists.
According to the technical means, whether the coarse leakage test is needed or not is judged twice, so that the influence of accidental clamping stagnation or opening delay of the carbon canister electromagnetic valve can be reduced.
Further, the S1 specifically includes: it is determined whether the following 4 conditions are satisfied:
condition 1: the vehicle is in an idling state;
condition 2: the carbon tank stop valve has no clamping stagnation normal open state fault;
condition 3: the carbon canister electromagnetic valve has no clamping stagnation normal open state fault;
condition 4: the carbon canister electromagnetic valve has no clamping stagnation normally closed state fault;
if the condition 1, the condition 2, the condition 3 and the condition 4 are all satisfied, entering S2; and if the condition 1, the condition 2, the condition 3 or the condition 4 does not satisfy at least one, exiting.
According to the technical means, when the vehicle is judged to be in the idling state, the idling of the vehicle is a precondition for judging whether leakage exists, and if the carbon canister stop valve has a clamping stagnation normally open state fault, the carbon canister electromagnetic valve has a clamping stagnation normally open state fault or the carbon canister electromagnetic valve has a clamping stagnation normally closed state fault, an evaporation system part formed by the carbon canister electromagnetic valve, the oil tank cover and the carbon canister stop valve cannot become a closed space, so that the interference of the conditions 1-4 needs to be eliminated.
Further, the S3 specifically includes: it is determined whether the following 7 conditions are satisfied:
condition a: the vehicle speed exceeds a set value, and the accumulated time of the vehicle speed exceeding the set value exceeds a calibrated target limit value;
condition b: the opening degree of the carbon canister electromagnetic valve exceeds a set value, and the accumulated time exceeding the set value exceeds a calibrated target limit value;
condition c: the accumulated desorption flow of the carbon canister electromagnetic valve exceeds a set value;
the condition 1, the condition 2, the condition 3 and the condition 4;
if all of the condition a, the condition b, the condition c, the condition 1, the condition 2, the condition 3, and the condition 4 are satisfied, the process proceeds to S4, and if at least one of the condition a, the condition b, the condition c, the condition 1, the condition 2, the condition 3, and the condition 4 is not satisfied, the process exits.
According to the technical means, compared with the first judgment, the conditions a-c are added, and the influence of accidental clamping stagnation or opening delay of the carbon canister electromagnetic valve is further reduced.
Further, the method for determining whether the coarse leakage exists specifically includes: and closing the carbon tank stop valve, controlling the carbon tank electromagnetic valve to be opened at a set duty ratio, judging whether the negative pressure detected by the oil tank pressure sensor reaches a set target value or not when the accumulated desorption flow of the carbon tank reaches a set value, judging that no coarse leakage fault exists if the negative pressure detected by the oil tank pressure sensor reaches the set target value, and judging that the coarse leakage fault exists if the negative pressure does not reach the set target value.
A rough leakage judging mechanism of the automobile evaporation system of the method for judging the rough leakage of the automobile evaporation system,
the device comprises a first judging module, a second judging module and a third judging module, wherein the first judging module is configured to judge whether a coarse leakage test is required;
an information acquisition module configured to acquire an engine state, a vehicle speed, a fuel tank pressure, a canister desorption flow rate, a canister solenoid valve opening degree, and transmit information to the first determination module,
a second determination module configured to determine whether a coarse leak is generated.
Further, the first determination module, the second determination module and the information acquisition module are integrated on an electronic engine control unit.
An automobile is provided with a mechanism for determining a rough leakage of an automobile evaporation system.
The invention has the beneficial effects that:
the invention aims at the scheme that the evaporation system carries out coarse leakage diagnosis under the idling condition, adopts a secondary diagnosis method, can eliminate or reduce the false alarm of coarse leakage fault when negative pressure is not established in time under the idling condition due to accidental clamping stagnation or opening delay of a carbon canister electromagnetic valve, and can improve the diagnosis robustness of the low-cost scheme of the idling coarse leakage diagnosis.
Drawings
FIG. 1 is a schematic diagram of an evaporation system of the present invention, wherein the dashed lines represent wiring harness connections, and the implementation represents piping connections;
FIG. 2 is a flow chart of the present invention;
FIG. 3 is a flow chart of S1 according to the present invention;
FIG. 4 is a flowchart of S3 according to the present invention.
Wherein, 1-an electronic engine control unit; 2-an engine; 3-a throttle body; 4-a supercharger; 5-an air filter; 6-three-way valve; 7-canister solenoid valve; 8-carbon canister; 9-tank pressure sensor; 10-a fuel tank; 11-canister stop valve; 12-ash filter.
Detailed Description
Other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein, wherein embodiments of the present invention are described below with reference to the accompanying drawings and preferred embodiments. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be understood that the preferred embodiments are illustrative of the invention only and are not limiting upon the scope of the invention.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.
The present embodiment proposes a method for determining a coarse leakage of an automotive evaporation system, the evaporation system in the embodiment has a structure as shown in fig. 1, and includes an engine electronic control unit 1, an engine 2, a throttle body 3, a supercharger 4, an air cleaner 5, a three-way valve 6, a canister solenoid valve 7, a canister 8, a tank pressure sensor 9, a fuel tank 10, a canister stop valve 11, and an ash filter 12, wherein the components for determining the corresponding part of the evaporation system leakage are: a fuel tank 10, a fuel tank pressure sensor 9, a carbon canister 8, a carbon canister electromagnetic valve 7, a carbon canister stop valve 11, an ash filter 12 and pipelines connected between the two. The three-way valve 6 and the engine 2 are connected with the pipeline respectively behind the throttle valve body 3 and the air filter 5, when the engine runs under the low-load working condition, the desorption flow of the carbon canister flows to the back of the throttle valve body 3 through the three-way valve 6, and when the engine runs under the high-load working condition, the desorption flow of the carbon canister flows to the back of the air filter through the three-way valve and is mixed with fresh air to flow into the engine for combustion.
As shown in fig. 2 to 4, the determination method specifically includes:
s1: judging whether a coarse leakage test is carried out or not based on the vehicle speed and the working states of the carbon tank stop valve and the carbon tank electromagnetic valve, and if so, entering S2; if not, exiting;
it is determined whether the following 4 conditions are satisfied:
condition 1: the vehicle is in an idling state;
condition 2: the carbon tank stop valve has no clamping stagnation normal open state fault;
condition 3: the carbon canister electromagnetic valve has no clamping stagnation normal open state fault;
condition 4: the carbon canister electromagnetic valve has no clamping stagnation normally closed state fault;
if the condition 1, the condition 2, the condition 3 and the condition 4 are all met, the step is entered into S2 to carry out a first coarse leakage test; if any of condition 1, condition 2, condition 3, or condition 4 is not satisfied, the coarse leak test is exited.
S2: the following steps are performed to determine the first coarse leakage, specifically:
the engine electronic control unit 1 controls the canister stop valve 11 to close and controls the canister solenoid valve 7 to open at a set duty ratio, if the negative pressure detected by the tank pressure sensor 9 does not reach a set target value when the accumulated canister desorption flow reaches a set value, it is determined that a suspected fault of coarse leakage exists, the fault is not determined immediately, but S3 is performed, if the negative pressure detected by the tank pressure sensor 9 can reach the set target value before the accumulated canister desorption flow reaches the set value, no coarse leakage diagnosis is passed, and the 1mm leakage diagnosis stage is entered.
S3: judging whether to continue a coarse leakage test or not based on the vehicle speed and the working states of the carbon tank stop valve and the carbon tank electromagnetic valve, if so, entering S4, and if not, exiting;
specifically, the determination is made under the following conditions:
condition a: the vehicle speed exceeds a set value, and the accumulated time of the vehicle speed exceeding the set value exceeds a calibrated target limit value;
condition b: the opening degree of the carbon canister electromagnetic valve exceeds a set value, and the accumulated time exceeding the set value exceeds a calibrated target limit value;
condition c: the accumulated desorption flow of the carbon canister electromagnetic valve exceeds a set value;
in the second diagnosis condition judgment process, in order to eliminate or reduce the influence of accidental opening delay or clamping stagnation of the carbon canister electromagnetic valve on the coarse leakage diagnosis result, the requirements of vehicle speed, carbon canister electromagnetic valve opening degree and accumulated cleaning flow are added on the condition judgment basis of S1, and the carbon canister electromagnetic valve is ensured to be fully actuated before the second diagnosis through the three factors.
If the condition a, the condition b, the condition c, the condition 1, the condition 2, the condition 3 and the condition 4 are all satisfied, which indicates that the influence caused by accidental jamming or opening delay of the canister solenoid valve 7 is completely eliminated, the process proceeds to S4, and if at least one of the condition a, the condition b, the condition c, the condition 1, the condition 2, the condition 3 and the condition 4 is not satisfied, which indicates that the influence caused by accidental jamming or opening delay of the canister solenoid valve 7 still exists, the determination of coarse leakage is exited.
S4: whether or not there is a coarse leak is determined for the second time by the following method.
Closing the carbon tank stop valve, controlling the carbon tank electromagnetic valve to be opened at a set duty ratio, judging whether the negative pressure detected by the oil tank pressure sensor reaches a set target value or not when the accumulated desorption flow of the carbon tank reaches a set value, judging that no coarse leakage fault exists if the negative pressure detected by the oil tank pressure sensor reaches the set target value, entering a 1mm leakage diagnosis stage, and judging that the coarse leakage fault exists if the negative pressure does not reach the set target value.
The embodiment further provides a mechanism for determining the coarse leakage of the automobile evaporation system, which is based on the method for determining the coarse leakage of the automobile evaporation system, and specifically comprises the following steps:
the mechanism for judging the rough leakage of the automobile evaporation system comprises a first judging module, an information acquisition module and a second judging module which are integrated on an electronic control unit 1 of an engine, wherein,
the information acquisition module is configured to be used for acquiring the engine state, the vehicle speed, the oil tank pressure, the carbon tank desorption flow and the carbon tank electromagnetic valve opening degree, and transmitting the information to the first determination module.
The first determination module is configured to determine whether a coarse leak test is required, specifically:
the first judging module judges whether the engine is in an idling state or not according to the state of the engine;
according to the change of the oil tank pressure, whether the carbon tank stop valve 11 is in a stuck normally open state fault or not can be judged, and if the carbon tank stop valve 11 is stuck normally open, the oil tank pressure is always equal to the external pressure;
whether the carbon tank electromagnetic valve has a clamping stagnation normally open state fault or not and whether the carbon tank electromagnetic valve has a clamping stagnation normally closed state fault or not can be judged according to the change of the desorption flow of the carbon tank. If the carbon tank electromagnetic valve has a clamping stagnation normally open state fault and the carbon tank electromagnetic valve has a clamping stagnation normally closed state fault, the desorption flow of the carbon tank cannot be changed, and a constant value is kept.
Meanwhile, whether the condition a, the condition b and the condition c are realized is judged according to the change of the vehicle speed, the opening degree of the carbon tank electromagnetic valve and the change of the carbon tank desorption flow.
And a second determination module configured to determine whether a coarse leakage is generated, whether a coarse leakage is generated.
Therefore, according to the information obtained by the information obtaining module, the first judging module judges whether the coarse leakage test is needed or not for the first time, if so, the second judging module is adopted to judge whether the coarse leakage is generated or not, if the coarse leakage is generated, the first judging module is started, whether the coarse leakage test is needed or not is judged again, and if so, the second judging module is started to judge whether the coarse leakage is generated or not.
The embodiment also provides an automobile, and the automobile is integrated with the coarse leakage judging mechanism of the automobile evaporation system.
The above embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention.
Claims (7)
1. A method for judging the coarse leakage of an automobile evaporation system is characterized by comprising the following steps:
s1: judging whether a coarse leakage test is carried out or not based on the vehicle speed and the working states of the carbon tank stop valve and the carbon tank electromagnetic valve, and if so, entering S2; if not, exiting;
s2: judging whether coarse leakage exists, if so, entering S3, otherwise, exiting;
s3: judging whether to continue a coarse leakage test or not based on the vehicle speed and the working states of the carbon tank stop valve and the carbon tank electromagnetic valve, if so, entering S4, and if not, exiting;
s4: it is determined whether a coarse leak exists.
2. The method for determining the coarse leakage of the evaporation system of the automobile according to claim 1, wherein: the S1 specifically includes: it is determined whether the following 4 conditions are satisfied:
condition 1: the vehicle is in an idling state;
condition 2: the carbon tank stop valve has no clamping stagnation normal open state fault;
condition 3: the carbon canister electromagnetic valve has no clamping stagnation normal open state fault;
condition 4: the carbon canister electromagnetic valve has no clamping stagnation normally closed state fault;
if the condition 1, the condition 2, the condition 3 and the condition 4 are all satisfied, entering S2; and if the condition 1, the condition 2, the condition 3 or the condition 4 does not satisfy at least one, exiting.
3. The method for determining the coarse leakage of the evaporation system of the automobile according to claim 2, wherein: the S3 specifically includes: it is determined whether the following 7 conditions are satisfied:
condition a: the vehicle speed exceeds a set value, and the accumulated time of the vehicle speed exceeding the set value exceeds a calibrated target limit value;
condition b: the opening degree of the carbon canister electromagnetic valve exceeds a set value, and the accumulated time exceeding the set value exceeds a calibrated target limit value;
condition c: the accumulated desorption flow of the carbon canister electromagnetic valve exceeds a set value;
the condition 1, the condition 2, the condition 3 and the condition 4;
if the condition a, the condition b, the condition c, the condition 1, the condition 2, the condition 3, and the condition 4 are all satisfied, the process proceeds to S4,
if at least one of the condition a, the condition b, the condition c, the condition 1, the condition 2, the condition 3 or the condition 4 is not satisfied,
then exit.
4. The method for determining the coarse leakage of the evaporation system of the automobile according to claim 3, wherein: the method for judging whether the coarse leakage exists specifically comprises the following steps: and closing the carbon tank stop valve, controlling the carbon tank electromagnetic valve to be opened at a set duty ratio, judging whether the negative pressure detected by the oil tank pressure sensor reaches a set target value or not when the accumulated desorption flow of the carbon tank reaches a set value, judging that no coarse leakage fault exists if the negative pressure detected by the oil tank pressure sensor reaches the set target value, and judging that the coarse leakage fault exists if the negative pressure does not reach the set target value.
5. A mechanism for determining a coarse leak in an automotive evaporation system based on the method for determining a coarse leak in an automotive evaporation system according to any one of claims 1 to 4, characterized in that:
the device comprises a first judging module, a second judging module and a third judging module, wherein the first judging module is configured to judge whether a coarse leakage test is required or not;
an information acquisition module configured to acquire an engine state, a vehicle speed, a fuel tank pressure, a canister desorption flow rate, a canister solenoid valve opening degree, and transmit information to the first determination module,
a second determination module configured to determine whether a coarse leak is generated.
6. The mechanism for determining the coarse leakage of an automotive evaporation system according to claim 5, characterized in that: the first determination module, the second determination module and the information acquisition module are integrated on an electronic engine control unit.
7. An automobile, characterized in that: the automobile evaporation system rough leakage determination mechanism as claimed in claim 5 or 6 is provided.
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| CN113550836A (en) * | 2021-08-13 | 2021-10-26 | 安徽江淮汽车集团股份有限公司 | Carbon tank electromagnetic valve leakage diagnosis method |
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| US20150114361A1 (en) * | 2013-10-30 | 2015-04-30 | Mitsubishi Jidosha Kogyo Kabushiki Kaisha | Fuel evaporative gas emission suppression system |
| CN111305979A (en) * | 2018-12-12 | 2020-06-19 | 上汽通用汽车有限公司 | System and method for detecting evaporative leakage in a fuel system in a vehicle |
| CN111608823A (en) * | 2020-05-13 | 2020-09-01 | 联合汽车电子有限公司 | Method for detecting opening delay of carbon canister valve and leakage of oil tank and leakage detection device |
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