CN115126635A - Fuel leakage diagnosis method and device based on OBD - Google Patents
Fuel leakage diagnosis method and device based on OBD Download PDFInfo
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- CN115126635A CN115126635A CN202110325742.1A CN202110325742A CN115126635A CN 115126635 A CN115126635 A CN 115126635A CN 202110325742 A CN202110325742 A CN 202110325742A CN 115126635 A CN115126635 A CN 115126635A
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- Prior art keywords
- fuel
- tank
- pressure
- obd
- leakage
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- 239000000446 fuel Substances 0.000 title claims abstract description 82
- 238000003745 diagnosis Methods 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 18
- 239000002828 fuel tank Substances 0.000 claims abstract description 37
- 238000002955 isolation Methods 0.000 claims abstract description 8
- 238000001514 detection method Methods 0.000 claims description 26
- 239000003921 oil Substances 0.000 claims description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 12
- 229910052799 carbon Inorganic materials 0.000 claims description 12
- 239000000295 fuel oil Substances 0.000 claims description 10
- 239000000126 substance Substances 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002405 diagnostic procedure Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
- F02M65/006—Measuring or detecting fuel leakage of fuel injection apparatus
-
- 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
- F02M25/0809—Judging failure of purge control system
- F02M25/0818—Judging failure of purge control system having means for pressurising the evaporative emission space
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Supplying Secondary Fuel Or The Like To Fuel, Air Or Fuel-Air Mixtures (AREA)
Abstract
The invention discloses an OBD-based fuel leakage diagnosis method and device, which are used for detecting whether fuel leakage exists in a fuel system and comprise the following steps of S1: collecting the internal pressure P of the fuel tank, comparing the internal pressure P with a preset pressure threshold value M, and entering a step S2 when P is less than or equal to M; when P > M, proceed to step S3; s2: simultaneously opening the reversing valve and the oil tank isolating valve, and comparing the current value I of the inflator pump with the nominal value N; s3: and opening the reversing valve without opening the oil tank isolation valve, and comparing the current value I of the inflator pump with the nominal value N. When I is larger than or equal to N, the fuel system does not have fuel leakage; and when I is less than N, indicating that fuel leakage exists in the fuel system, and sending an alarm prompt. According to the invention, by acquiring the pressure in the fuel tank and adopting a corresponding diagnosis method according to different pressures, the situation that the reversing valve is reset when the pressure in the fuel tank is too high is avoided, the safe pressure relief range of the fuel system is kept, and the safety of the fuel system is improved.
Description
Technical Field
The invention relates to the technical field of automobile fuel control, in particular to a fuel leakage diagnosis method and device based on OBD.
Background
With the development of the technology, the consumption level of people is gradually improved, and the automobile has entered the life of people, so that great convenience is brought to people for going out. The fuel system is an important component of an automobile, and during the driving process of the automobile, fuel has a leakage risk, which brings hidden danger to the safety of people, so that whether fuel leaks or not needs to be diagnosed.
With the upgrading of emission regulations, the current national six regulations require the use of OBD to diagnose the whole fuel system and judge whether leakage exists. The existing extended range type automobile adopts a positive pressure detection integrated scheme. However, when the positive pressure detection integrated scheme is adopted for diagnosis, the reversing valve of the air pump and the isolation valve of the fuel tank are opened together, the air pump can inflate the whole fuel system, and if the pressure in the fuel tank is very high before detection, the reaction of the fuel pressure and the air pump, the carbon tank and the reversing valve can be caused, so that the air pump is overloaded, and the service life of the air pump is influenced; carbon canister over-pressure, affecting reliability; the reversing valve can not reset, and the fuel pressure can not be released.
Disclosure of Invention
The invention provides a fuel leakage diagnosis method and device based on OBD (on-board diagnostics), aiming at the problem that a reversing valve cannot be reset due to overlarge internal pressure of a fuel tank during fuel leakage diagnosis in the prior art.
In order to achieve the purpose, the invention provides the following technical scheme:
an OBD-based fuel leakage diagnosis method is used for detecting whether fuel leakage exists in a fuel system, and specifically comprises the following steps:
s1: collecting the internal pressure P of the fuel tank, comparing the internal pressure P with a preset pressure threshold value M in the OBD, and entering step S2 when P is less than or equal to M; when P > M, proceed to step S3;
s2: simultaneously opening a reversing valve and an oil tank isolating valve, opening an inflator pump in a detection module to inflate the fuel system, and comparing the current value I of the inflator pump with a nominal value N; when I is larger than or equal to N, the fuel oil leakage does not exist in the fuel oil system, and the detection is finished; when I is less than N, indicating that fuel leakage exists in the fuel system, and sending an alarm prompt;
s3: opening the reversing valve without opening the oil tank isolation valve, inflating and pressurizing the pipeline and the carbon tank behind the oil tank isolation valve by the inflator pump, and comparing the current value I of the inflator pump with the nominal value N; when I is larger than or equal to N, the fuel oil leakage does not exist in the fuel oil system, and the detection is finished; and when I is less than N, indicating that fuel leakage exists in the fuel system, and sending an alarm prompt.
Preferably, a sensor is arranged at the outlet of the fuel tank and used for collecting and collecting the internal pressure P of the fuel tank and transmitting the internal pressure P to the OBD.
Preferably, in S1, M is 5 KPa.
Preferably, the S2 further includes: when N1 is more than I and less than N, indicating that the fuel system has small hole leakage, and sending a first-level alarm prompt; and when the I is less than or equal to N1, indicating that the fuel system has large-hole leakage, sending a secondary alarm prompt, and indicating the current threshold value by N1.
The invention also provides an OBD-based fuel leakage diagnosis device which is used for detecting whether fuel leakage exists in the fuel system and comprises a data acquisition module, a comparison module, a control module and an alarm module; wherein the content of the first and second substances,
the data acquisition module is used for respectively acquiring the internal pressure P of the fuel tank and the current I of the inflator pump;
the comparison module is used for comparing the internal pressure P of the collected fuel tank with the current I of the inflator pump respectively so as to output a pressure comparison result and a current comparison result;
the control module is used for adopting a corresponding diagnosis scheme according to the pressure comparison result output by the comparison module;
and the alarm module is used for sending out a corresponding alarm prompt according to the current comparison result output by the comparison module.
Preferably, when the internal pressure P of the fuel tank is less than or equal to a preset pressure threshold value M, the reversing valve and the fuel tank isolating valve are opened simultaneously; when the internal pressure P of the fuel tank is larger than a preset pressure threshold value M, the reversing valve is opened, and the fuel tank isolating valve is not opened.
In summary, due to the adoption of the technical scheme, compared with the prior art, the invention at least has the following beneficial effects:
according to the invention, by collecting the pressure in the fuel tank and adopting a corresponding diagnosis method according to different pressures, fuel steam is prevented from reacting on the inflator pump and the carbon canister when the pressure in the fuel tank is too high, so that the service lives of the inflator pump and the carbon canister are prolonged. Meanwhile, the reversing valve can be ensured to be reset after diagnosis, the safe pressure relief range of the fuel system is kept, and the safety of the fuel system is improved.
Description of the drawings:
fig. 1 is a schematic structural view of a fuel leak detection system according to an exemplary embodiment of the present invention.
Fig. 2 is a schematic diagram of an OBD-based fuel leak diagnostic method according to an exemplary embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to examples and embodiments. It should be understood that the scope of the above-described subject matter is not limited to the following examples, and any techniques implemented based on the disclosure of the present invention are within the scope of the present invention.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.
As shown in fig. 1, which is a schematic structural diagram of an existing fuel leakage detection system, a fuel tank is connected to a canister through an isolation valve, the canister is connected to an oil load through an oil line pipeline, the canister is further connected to a detection module, an inflator pump, a reversing valve and a current detection circuit are integrated in the detection module, and the current detection circuit is used for detecting current of the inflator pump and transmitting current data to all OBDs.
The technical scheme adopted by the fuel diagnosis in the prior art is a positive pressure detection integrated scheme, and when the fuel diagnosis is carried out, a reversing valve of an inflating pump and an oil tank isolating valve are opened together, and the inflating pump can inflate the whole fuel system. If the pressure in the fuel tank is high before detection, the fuel pressure reaction and the air pump, the carbon tank and the reversing valve can be caused, the air pump is overloaded, and the service life of the air pump is influenced; carbon canister over-pressure, affecting reliability; the pressure of a return spring of the reversing valve is about 10KPa, and the internal pressure of the oil tank can reach 30KPa, so that the reversing valve cannot be reset, the fuel pressure cannot be released, and potential safety hazards exist.
As shown in fig. 2, the invention provides an OBD-based fuel leakage diagnosis method for detecting whether fuel leakage exists in a fuel system, which specifically includes the following steps:
s1: collecting the internal pressure P of the fuel tank, comparing the internal pressure P with a preset pressure threshold value M in the OBD, and entering step S2 when P is less than or equal to M; when P > M, the process proceeds to step S3.
In this embodiment, a pressure sensor is installed at an outlet of a fuel tank, and the pressure sensor transmits the acquired internal pressure P of the fuel tank to an On-Board Diagnostic (OBD) system, and compares the acquired internal pressure P with a preset pressure threshold value M, where M may be 5 KPa; when P is less than or equal to M, the process proceeds to step S2; when P > M, the process proceeds to step S3. The detection environment of the invention is that the automobile is in a static state, and because the temperature has influence on the pressure, the accuracy of the detection result is reduced due to the change of the temperature.
S2: and simultaneously opening the reversing valve and the oil tank isolating valve, opening an inflator pump in the detection module to inflate the fuel system, and comparing the current value I of the inflator pump with the nominal value N. When I is larger than or equal to N, the fuel oil leakage does not exist in the fuel oil system, and the detection is finished; and when I is less than N, indicating that fuel leakage exists in the fuel system, and sending an alarm prompt.
In this embodiment, the fuel system includes a fuel tank, a canister, and a connecting pipe. The detection module is integrated with an inflator pump, a reversing valve and a current detection circuit, and the current detection circuit (the current is present, and therefore not described in detail) is used for detecting the current of the inflator pump and transmitting current data to the OBD.
In the embodiment, when N1 is more than I and less than N, the fuel system is indicated to have small hole leakage, and a first-level alarm prompt is sent out, for example, the diameter range of the small hole is 1mm-3 mm; when I is less than or equal to N1, indicating that the fuel system has large hole leakage, and sending a secondary alarm prompt, for example, the diameter range of the small hole exceeds 3 mm.
The invention can form an aperture-ammeter after a plurality of experiments, and the meter records that the leak hole with each diameter in the fuel system has a corresponding current value, so the diameter of the leak hole can be determined only by comparing the current I detected in real time in the aperture-ammeter.
S3: and opening the reversing valve without opening the oil tank isolating valve, inflating and pressurizing the pipeline and the carbon tank behind the oil tank isolating valve by the inflator pump, and comparing the current value I of the inflator pump with the nominal value N. When I is larger than or equal to N, the fuel system does not have fuel leakage, and the detection is finished; and when I is less than N, indicating that fuel leakage exists in the fuel system, and sending an alarm prompt.
Because the reset of the reversing valve in the detection module is realized by a spring, the reset pressure of the spring is about 10KPa, and the internal pressure of the fuel tank can reach 30 KPa. When the internal pressure of the fuel tank is greater than the spring reset pressure, the reversing valve cannot be reset, the fuel pressure cannot be released, and potential safety hazards exist.
The fuel steam inside the fuel tank reacts on the inflator pump and the carbon tank, and when the internal pressure of the fuel tank is greater than a preset pressure threshold value, the impact on the inflator pump and the carbon tank can be caused, and the service life is shortened. Therefore, the technical scheme of the invention prolongs the service life of the inflator pump and the carbon tank.
The invention also provides an OBD-based fuel leakage diagnosis device which is used for detecting whether fuel leakage exists in the fuel system and comprises a data acquisition module, a comparison module, a control module and an alarm module; wherein the content of the first and second substances,
the data acquisition module is used for respectively acquiring the internal pressure P of the fuel tank and the current I of the inflator pump;
the comparison module is used for comparing the internal pressure P of the collected fuel tank with the current I of the inflator pump respectively so as to output a pressure comparison result and a current comparison result;
the control module is used for adopting a corresponding diagnosis scheme according to the pressure comparison result output by the comparison module;
and the alarm module is used for sending out a corresponding alarm prompt according to the current comparison result output by the comparison module.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples of practicing the invention, and that various changes in form and detail may be made therein without departing from the spirit and scope of the invention in practice.
Claims (6)
1. An OBD-based fuel leakage diagnosis method is used for detecting whether fuel leakage exists in a fuel system, and is characterized by comprising the following steps:
s1: collecting the internal pressure P of the fuel tank, comparing the internal pressure P with a preset pressure threshold value M in the OBD, and entering step S2 when P is less than or equal to M; when P > M, go to step S3;
s2: simultaneously opening a reversing valve and an oil tank isolating valve, opening an inflator pump in a detection module to inflate the fuel system, and comparing a current value I of the inflator pump with a nominal value N; when I is larger than or equal to N, the fuel oil leakage does not exist in the fuel oil system, and the detection is finished; when I is less than N, indicating that fuel leakage exists in the fuel system, and sending an alarm prompt;
s3: opening the reversing valve without opening the oil tank isolation valve, inflating and pressurizing the pipeline and the carbon tank behind the oil tank isolation valve by the inflator pump, and comparing the current value I of the inflator pump with the nominal value N; when I is larger than or equal to N, the fuel oil leakage does not exist in the fuel oil system, and the detection is finished; and when I is less than N, indicating that fuel leakage exists in the fuel system, and sending an alarm prompt.
2. The OBD-based fuel leakage diagnosis method according to claim 1, wherein a sensor is installed at the fuel tank outlet for collecting and transmitting the internal fuel tank pressure P to the OBD.
3. The OBD-based fuel leak diagnosis method according to claim 1, wherein in S1, M is 5 KPa.
4. The OBD-based fuel leak diagnosis method according to claim 1, wherein the S2 further includes: when N1 is more than I and less than N, indicating that the fuel system has small hole leakage, and sending a first-level alarm prompt; and when the I is less than or equal to N1, indicating that the fuel system has large-hole leakage, sending a secondary alarm prompt, and indicating the current threshold value by N1.
5. A fuel leakage diagnosis device based on OBD is used for detecting whether fuel leakage exists in a fuel system or not, and is characterized by comprising a data acquisition module, a comparison module, a control module and an alarm module; wherein the content of the first and second substances,
the data acquisition module is used for respectively acquiring the internal pressure P of the fuel tank and the current I of the inflator pump;
the comparison module is used for comparing the internal pressure P of the collected fuel tank with the current I of the inflator pump respectively so as to output a pressure comparison result and a current comparison result;
the control module is used for adopting a corresponding diagnosis scheme according to the pressure comparison result output by the comparison module;
and the alarm module is used for sending out a corresponding alarm prompt according to the current comparison result output by the comparison module.
6. An OBD-based fuel leakage diagnosis apparatus according to claim 5, wherein the selector valve and the tank isolation valve are opened simultaneously when the internal fuel tank pressure P is less than or equal to a preset pressure threshold M; when the internal pressure P of the fuel tank is larger than a preset pressure threshold value M, the reversing valve is opened, and the fuel tank isolating valve is not opened.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110325742.1A CN115126635A (en) | 2021-03-26 | 2021-03-26 | Fuel leakage diagnosis method and device based on OBD |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110325742.1A CN115126635A (en) | 2021-03-26 | 2021-03-26 | Fuel leakage diagnosis method and device based on OBD |
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| Publication Number | Publication Date |
|---|---|
| CN115126635A true CN115126635A (en) | 2022-09-30 |
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| CN202110325742.1A Pending CN115126635A (en) | 2021-03-26 | 2021-03-26 | Fuel leakage diagnosis method and device based on OBD |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11326110A (en) * | 1998-05-15 | 1999-11-26 | Unisia Jecs Corp | Device for diagnosing leak from evaporated-fuel treating device |
| US20050034513A1 (en) * | 2001-07-25 | 2005-02-17 | Martin Streib | Method and control unit for functional diagnosis of a fuel tank ventilation valve in a fuel tank system, especially in a motor vehicle |
| CN1746477A (en) * | 2004-09-07 | 2006-03-15 | 本田技研工业株式会社 | Failure diagnosis apparatus for evaporative fuel processing system |
| CN106500933A (en) * | 2016-12-27 | 2017-03-15 | 上海汽车集团股份有限公司 | High pressure resistant fuel tank leakage diagnosing method |
| CN206972399U (en) * | 2017-04-28 | 2018-02-06 | 长城汽车股份有限公司 | Fuel leakage diagnostic module and grey filter cleaning system |
| CN209539471U (en) * | 2019-02-19 | 2019-10-25 | 江铃汽车股份有限公司 | A kind of hybrid vehicle EVAP Evaporative System leakage diagnostic device |
| CN210396915U (en) * | 2019-07-18 | 2020-04-24 | 上海元城汽车技术有限公司 | Fuel steam treatment system and automobile |
| CN111350598A (en) * | 2020-02-21 | 2020-06-30 | 吉利汽车研究院（宁波）有限公司 | Dual-fuel leakage diagnosis system and diagnosis method thereof |
-
2021
- 2021-03-26 CN CN202110325742.1A patent/CN115126635A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11326110A (en) * | 1998-05-15 | 1999-11-26 | Unisia Jecs Corp | Device for diagnosing leak from evaporated-fuel treating device |
| US20050034513A1 (en) * | 2001-07-25 | 2005-02-17 | Martin Streib | Method and control unit for functional diagnosis of a fuel tank ventilation valve in a fuel tank system, especially in a motor vehicle |
| CN1746477A (en) * | 2004-09-07 | 2006-03-15 | 本田技研工业株式会社 | Failure diagnosis apparatus for evaporative fuel processing system |
| CN106500933A (en) * | 2016-12-27 | 2017-03-15 | 上海汽车集团股份有限公司 | High pressure resistant fuel tank leakage diagnosing method |
| CN206972399U (en) * | 2017-04-28 | 2018-02-06 | 长城汽车股份有限公司 | Fuel leakage diagnostic module and grey filter cleaning system |
| CN209539471U (en) * | 2019-02-19 | 2019-10-25 | 江铃汽车股份有限公司 | A kind of hybrid vehicle EVAP Evaporative System leakage diagnostic device |
| CN210396915U (en) * | 2019-07-18 | 2020-04-24 | 上海元城汽车技术有限公司 | Fuel steam treatment system and automobile |
| CN111350598A (en) * | 2020-02-21 | 2020-06-30 | 吉利汽车研究院（宁波）有限公司 | Dual-fuel leakage diagnosis system and diagnosis method thereof |
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Application publication date: 20220930 |
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