CN102678396A - Diagnostic method for carbon canister flow - Google Patents
Diagnostic method for carbon canister flow Download PDFInfo
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- CN102678396A CN102678396A CN2012101409083A CN201210140908A CN102678396A CN 102678396 A CN102678396 A CN 102678396A CN 2012101409083 A CN2012101409083 A CN 2012101409083A CN 201210140908 A CN201210140908 A CN 201210140908A CN 102678396 A CN102678396 A CN 102678396A
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- vent valve
- canister vent
- charcoal jar
- diagnostic method
- intake manifold
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Abstract
The invention discloses a diagnostic method for carbon canister flow. The diagnostic method comprises the following steps of: when a vehicle enters into a slide fuel-cut operating mode, adjusting and controlling an electronic signal for an opening of a carbon canister control valve by an engine managing system so as to change the opening of the carbon canister control valve, and synchronously detecting if the change speed of the pressure in an induction manifold changes following the change of the opening; if yes, confirming that the carbon canister flow is normal; and if not, confirming that the carbon canister flow is in fault. According to the diagnostic method for the carbon canister flow, the tightly blocking or pipeline blocking fault of the carbon canister control valve is effectively detected. The diagnostic method has the advantages of simple diagnostic process and lower cost.
Description
Technical field
The application relates to a kind of auto electronic control technology, particularly relates to the diagnostic techniques in a kind of evaporant emission control systems.
Background technique
In order to prevent that the fuel oil in the fuel tank from evaporateing in the atmosphere, motor car engine all is designed with the evaporant emission control systems.See also Fig. 1, this is the structural representation of existing evaporant emission control systems.Holding in the fuel tank (tank) 10 of fuel oil has first pipeline 15 to lead among the active carbon in the charcoal jar (canister) 20.Be contained with the active carbon that is used to adsorb fuel vapor in the charcoal jar 20.Charcoal jar 20 has second pipeline 25 to lead to closure (throttle) in the intake manifold (intake manifold) 30 after 32, pressure transducer (P Sensor) before in addition.On this second pipeline 25, be provided with canister vent valve (CPV) 21.Be provided with Air flow meter (HFM) 31, closure 32 and pressure transducer 33 successively along airintake direction in the said intake manifold 30, Air flow meter 31 can be omitted any one with pressure transducer 33.
The working principle of above-mentioned evaporant emission control systems is: the fuel vapor that evaporates in the fuel tank 10 gets into charcoal jar 20 and quilt active carbon adsorption wherein through first pipeline 15.When motor moves, be negative pressure state in the intake manifold 30, attract fresh air to get into charcoal jar 20, fuel vapor desorption adsorbed in the active carbon is come out.The mixed gas of fresh air and fuel vapor gets into intake manifold 30 by second pipeline 25, finally gets in the motor again and burns.Said process is called the flushing of fresh air to charcoal jar 20, can reduce the fuel evaporation thing like this and be discharged in the atmosphere, can realize recycling of active carbon again.
At present using maximum canister vent valves is TEV2, and its inside is provided with electromagnetic coil, and the PWM (pulse-width signal) that exported by electronic controller drives, and changes aperture according to the dutycycle of pwm signal, thereby realizes the flushing air-flow requirement under the different operating modes.
Following fault may take place in the flushing charcoal jar process.A kind of is line clogging, and promptly second pipeline 25 is partly or entirely stopped up.Another kind is that valve blocks, and promptly canister vent valve 21 is stuck on the position of standard-sized sheet, complete shut-down or part aperture, can't be again changes aperture according to the dutycycle of pwm signal.Automobile engine management system (EMS under the normal condition; Engine Management System) can calculate flow, this calculated value and actual value basically identical according to the pwm signal of control canister vent valve 21 apertures through the fuel-air mixture of second pipeline 25.Block in case line clogging and/or valve take place, then this calculated value will produce deviation with actual value.
In the evaporant emission control systems, setting is not used for detecting from the flow of charcoal jar through the fuel-air mixture of second pipeline and (abbreviates as: sensor charcoal jar flow).The EMS system judges through the complicated diagnostic logic of a cover whether charcoal jar flow exists fault at present.This diagnostic logic comprises passive diagnosis and initiatively diagnoses two stages.
Said passive diagnosis is meant: behind engine start; The EMS system closes canister vent valve earlier; Should not have the gas flow through second pipeline this moment in theory, and two values of EMS system-computed---mixed gas self study value should be 0, and mixture control fr should be 1.If the former be approximately 0 and the latter be approximately 1, then the EMS system still keeps passive diagnosis; Otherwise just get into initiatively diagnosis.Canister vent valve is opened by the EMS system then, and this moment, the injection time of fuel injection apparatus can obviously reduce in theory.If the minimizing of injection time surpasses certain threshold value, then charcoal jar flow fault-free is judged by the EMS system, and still keeps passive diagnosis; Otherwise just get into initiatively diagnosis.
Said active diagnosis is meant: when motor ran to idling operation, canister vent valve was opened by the EMS system, and in theory can cause mixture control fr or engine power at least one of to change through the mixed gas of second pipeline this moment.If have at least one to change in these two values, then judge vapor return pipe road fault-free, and return passive diagnosis; Otherwise just judge that charcoal jar flow has fault.
The diagnostic method of above-mentioned charcoal jar flow and the air inlet calculating of intake manifold, closure control and idle speed control mutually combine, influence each other, thereby diagnostic logic is very complicated.And the device of intake manifold measurement air inflow is also different, has more aggravated the complexity of diagnosis.Some intake manifold adopts Air flow meter to measure air inflow, and do not counted by the mixed gas that second pipeline gets into this moment.Other intake manifold 3 usefulness pressure transducers are measured air inflow, in the mixed gas that got into by second pipeline this moment is counted.
Test finds that the diagnostic method of existing charcoal jar flow can only be diagnosed out following fault reliably:
1, second pipeline stops up fully;
2, canister vent valve is stuck in standard-sized sheet or complete shut-down place.
For following situation, the diagnostic method of existing charcoal jar flow can't reliable recognition go out:
1, second pipe section stops up;
2, canister vent valve is stuck in the position of part aperture.
Because not only diagnostic procedure is complicated for the diagnostic method of existing charcoal jar flow, difficulty of matching is big and cost is higher, and can only diagnose out the partial fault in vapor return pipe road, therefore all in the EMS system, this diagnostic function is closed usually.
Summary of the invention
The application's technical problem to be solved provides the diagnostic method of the charcoal jar flow in a kind of evaporant emission control systems of motor car engine, shortcomings such as existing diagnostic method is unreliable to overcome, diagnostic procedure complicacy.
For solving the problems of the technologies described above; The diagnostic method of the application's charcoal jar flow is: when the oil-break operating mode is slided in the vehicle entering; Engine management system is regulated the electronic signal of control canister vent valve aperture; With the aperture of change canister vent valve, and whether the pressure of detecting synchronously in the intake manifold changes thereupon;
If judge that then charcoal jar flow is normal;
If, do not judge that then charcoal jar flow breaks down.
The application can diagnose the fault of charcoal jar flow effectively, comprises that line clogging and valve block, and has simple, the lower-cost advantage of diagnostic procedure.
Description of drawings
Fig. 1 is the structural representation of the evaporant emission control systems of motor car engine;
Fig. 2 is first embodiment's the flow chart of the diagnostic method of the application's charcoal jar flow;
Fig. 3 is the flow chart that the diagnostic method of the application's charcoal jar flow is judged fault type;
Fig. 4 is second embodiment's the flow chart of the diagnostic method of the application's charcoal jar flow.
Description of reference numerals among the figure:
10 is fuel tank; 15 is first pipeline; 20 is the charcoal jar; 21 is canister vent valve; 25 is second pipeline; 30 is intake manifold; 31 is Air flow meter; 32 is closure; 33 is pressure transducer.
Embodiment
The diagnostic method of the application's charcoal jar flow is applicable to such evaporant emission control systems.See also Fig. 1, be provided with closure 32 and pressure transducer 33 successively along airintake direction in the intake manifold 30, pressure transducer 33 is used to detect the pressure in the intake manifold 30.Second pipeline 25 connects charcoal jar 20 and intake manifold 30.Second pipeline 25 is connected to the position in the intake manifold 30, after closure 32, before the pressure transducer 33.Charcoal jar modulating valve 21 is arranged on second pipeline 25.Air flow meter 31 among Fig. 1 can dispense in this application.
See also Fig. 2, first embodiment of the diagnostic method of the application's charcoal jar flow comprises:
At first, EMS system wait vehicle gets into and slides the oil-break operating mode.The said oil-break operating mode that slides is meant that vehicle satisfies following three conditions simultaneously: vehicle has certain speed (＞0), not oil spout of fuel injection apparatus, closure complete shut-down.
Then, the EMS system regulates the electronic signal of control canister vent valve 21 apertures, and detects the pressure in the intake manifold 30 synchronously.Under the normal condition, the aperture of canister vent valve 21 receives the control of electronic signal and changes.For example said electronic signal is a pwm signal, and the aperture of canister vent valve 21 and the dutycycle of this pwm signal are linearly proportional.It is big that the dutycycle of this pwm signal becomes, and then the aperture of canister vent valve 21 increases, and then the pressure in the intake manifold 30 raises; Vice versa.Pressure in the intake manifold 30 is measured by the pressure transducer 33 in the intake manifold 30.
If the pressure in the intake manifold 30 and said electronic signal increase synchronously the aperture control of canister vent valve 31 or reduce, then EMS system judgement charcoal jar flow is normal.
Otherwise the EMS system judges that charcoal jar flow breaks down.
Among above-mentioned first embodiment, " the EMS system regulates the electronic signals of control canister vent valve 21 apertures " can be optimized for: the adjusting of said electronic signal is covered make overall process and the overall process from standard-sized sheet to complete shut-down of canister vent valve 21 from complete shut-down (aperture is 0) to standard-sized sheet (aperture is 100%).The purpose of doing like this is in order to diagnose all kinds fault of canister vent valve all sidedly; Because the fault that some valve blocks only the aperture of canister vent valve 21 increase or the process that reduces in just can take place, even only when canister vent valve 21 complete shut-downs or standard-sized sheet, just can take place.
Above-mentioned first embodiment to the diagnosis principle of charcoal jar flow is: when the oil-break operating mode was slided in the vehicle entering, the degree of vacuum in the intake manifold was very high, and air-distributor pressure is relatively stable.At this moment, the unlatching of canister vent valve is obvious to the pressure effect in the intake manifold, and there is linear relationship in the pressure in the aperture of canister vent valve and the intake manifold.Through the pressure in the intake manifold, can diagnose the plugging fault that blocks the fault and second pipeline of canister vent valve.
Record the pressure in the pairing intake manifold 30 of the different opening of canister vent valve 21 under the normal condition in the EMS system.We are during with 21 complete shut-downs of canister vent valve under the normal condition, and the pressure in the intake manifold 30 are called minimum; During canister vent valve 21 standard-sized sheets, the pressure in the intake manifold 30 is called peak.When canister vent valve 21 was in the middle of certain aperture, the pressure in the intake manifold 30 was between minimum and peak so.
See also Fig. 3, the application is when judging that charcoal jar flow breaks down, and is also following to the judgement of various fault types:
One of which; In the overall process of said electronic signal control canister vent valve 21 opening and closing; If (or variable quantity is very little for the pressure no change in the intake manifold 30; Can be approximately no change) and be minimum, then the EMS system judges that second pipeline 25 stops up fully or canister vent valve 21 is stuck in the complete shut-down position.If the pressure no change in the intake manifold 30 and be peak, then EMS system judgement canister vent valve 21 is stuck at fully open position.If the pressure no change in the intake manifold 30 and between minimum and peak, then the EMS system judge canister vent valve 21 stuck in the middle of certain the aperture position, also can counter to release canister vent valve 21 stuck in which aperture position according to force value.
Its two, under the prerequisite that does not meet above-mentioned first condition, the EMS system judges that canister vent valve 21 is normal.This moment is when the aperture of canister vent valve 21 reaches the target location; Pressure in the intake manifold 30 consistent with the pairing normal pressure in this target location (though or inconsistent; But deviation between the two is very little, and both are approximate consistent), then the EMS system judges that second pipeline 25 is also normal; Otherwise the obstruction of second pipeline, 25 parts is judged by the EMS system.
Therefore, above-mentioned first embodiment can diagnose out following fault:
1, second pipeline stops up or canister vent valve is stuck in the complete shut-down place fully.
2, canister vent valve is stuck in the standard-sized sheet place.
3, canister vent valve is stuck in the position of part aperture.
4, second pipe section stops up.
Above-mentioned first embodiment is still imperfect, owing to open canister vent valve and can make fuel vapor directly enter atmosphere sliding under the oil-break operating mode, causes environmental pollution.Therefore, the application provides the diagnostic method of another kind of charcoal jar flow, and is as shown in Figure 3.It is before the fault diagnosis of carrying out charcoal jar flow; At first judge the concentration of the fuel vapor in the charcoal jar; Have only when concentration less than certain threshold values (near fresh air), just allow to carry out the fault diagnosis in vapor return pipe road when perhaps charcoal jar washing time surpasses certain threshold values.
See also Fig. 4, second embodiment of the diagnostic method of the application's canister vent valve comprises:
At first, the fuel vapor concentration in the EMS system wait charcoal jar 20 slides the oil-break operating mode less than a certain threshold values and vehicle entering.As long as motor is in running state, be negative pressure state just in the intake manifold, fresh air is just constantly carrying out the flushing of charcoal jar, and the fuel vapor concentration in the charcoal jar just can not rise.This fuel vapor concentration is the measurement of EMS system according to the vehicle actual state, calculates.Said threshold value is represented to allow with the amount of the fuel vapor discharge in the charcoal jar in the atmosphere, and it is provided with more for a short time, and is just few more to the pollution of environment.For example, this threshold values can be set to, and makes the fuel vapor concentration in the charcoal jar very low, and the fuel-air mixture of second pipeline of promptly flowing through approaches fresh air.
Then, the EMS system regulates the electronic signal of control canister vent valve 21 apertures, and detects the pressure in the intake manifold 30 synchronously.
If the pressure in the intake manifold 30 and said electronic signal increase synchronously the aperture control of canister vent valve 21 or reduce, then EMS system judgement charcoal jar flow is normal.
Otherwise the EMS system judges that charcoal jar flow breaks down.
Said " fuel vapor concentration in the charcoal jar 20 is less than a certain threshold values " is replaceable to be " charcoal jar washing time surpasses certain threshold values "; This is because to having the linear ratio relation between the interior fuel vapor concentration of continual rinsing time of charcoal jar 20 and charcoal jar 20, thereby gets any and all can as condition.
Above-mentioned second embodiment only is equivalent to the fuel vapor concentration in the charcoal jar when low, just moves the described diagnostic method of first embodiment, though the interior fuel vapor of charcoal jar still can enter atmosphere, pollution level will greatly reduce.
More than be merely the application's preferred embodiment, and be not used in qualification the application.For a person skilled in the art, the application can have various changes and variation.All within the application's spirit and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within the application's the protection domain.
Claims (8)
1. the diagnostic method of a charcoal jar flow; It is characterized in that when the oil-break operating mode was slided in the vehicle entering, engine management system was regulated the electronic signal of control canister vent valve aperture; With the aperture of change canister vent valve, and whether the pressure of detecting synchronously in the intake manifold changes thereupon;
If judge that then charcoal jar flow is normal;
If, do not judge that then charcoal jar flow breaks down.
2. the diagnostic method of charcoal jar flow according to claim 1 is characterized in that, the said oil-break operating mode that slides is meant that vehicle satisfies following three conditions simultaneously: vehicle has speed, not oil spout of fuel injection apparatus, the closure complete shut-down greater than 0.
3. the diagnostic method of charcoal jar flow according to claim 1 is characterized in that, the electronic signal of said adjusting control canister vent valve aperture covers and makes the overall process of canister vent valve from the complete shut-down to the standard-sized sheet and the overall process from the standard-sized sheet to the complete shut-down.
4. the diagnostic method of charcoal jar flow according to claim 1 is characterized in that, said electronic signal is a pwm signal, and the aperture of canister vent valve and the dutycycle of this pwm signal are linearly proportional; It is big that the dutycycle of this pwm signal becomes, and then the aperture of canister vent valve increases, and then the pressure in the intake manifold raises; Vice versa.
5. the diagnostic method of charcoal jar flow according to claim 1 is characterized in that, during with canister vent valve complete shut-down, standard-sized sheet, the pressure in the intake manifold is called minimum, peak respectively;
Pressure no change in intake manifold and be minimum judges that then the pipeline that canister vent valve is installed stops up fully or canister vent valve is stuck in the complete shut-down position;
Pressure no change in intake manifold and be peak judges that then canister vent valve is stuck in fully open position;
When the pressure no change in the intake manifold and between minimum and peak, judge that then canister vent valve is stuck in middle aperture;
Pressure in intake manifold changes, and judges that then canister vent valve is normal.
6. the diagnostic method of charcoal jar flow according to claim 5; It is characterized in that; Pressure in intake manifold changes; But when canister vent valve reach the target aperture time, the pressure in the intake manifold does not reach the pairing pressure of this target aperture, judges that then the pipe section that canister vent valve is installed stops up; Otherwise judge that the pipeline that canister vent valve is installed is normal.
7. the diagnostic method of charcoal jar flow according to claim 1 is characterized in that, only the fuel vapor concentration in the charcoal jar gets into when sliding the oil-break operating mode less than threshold value and vehicle, just starts said diagnostic method; Said threshold value is represented to allow with the amount of the fuel vapor discharge in the charcoal jar in the atmosphere.
8. the diagnostic method of charcoal jar flow according to claim 7 is characterized in that, the condition of said " fuel vapor concentration in the charcoal jar is less than threshold value " changes the condition of " charcoal jar washing time is greater than threshold values " into.
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| CN201210140908.3A CN102678396B (en) | 2012-05-08 | 2012-05-08 | The diagnostic method of canister flow |
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| CN104975996A (en) * | 2014-04-14 | 2015-10-14 | 爱三工业株式会社 | Vaporized Fuel Processing Apparatus |
| US9168829B2 (en) | 2013-07-17 | 2015-10-27 | Ford Global Technologies, Llc | Vapor storage device having a diffuser plate and dome |
| CN104198168B (en) * | 2014-08-15 | 2017-01-18 | 潍柴动力股份有限公司 | Fault detecting method and device for control unit of engine exhaust gas valve |
| CN106337761A (en) * | 2015-07-10 | 2017-01-18 | 奥特润株式会社 | Diagnostic method for diagnosing sticking of canister purge valve and automotive diagnostic system therefor |
| CN106662044A (en) * | 2014-09-01 | 2017-05-10 | 爱三工业株式会社 | Device for treating evaporated fuel |
| CN109441671A (en) * | 2018-10-26 | 2019-03-08 | 安徽江淮汽车集团股份有限公司 | A kind of low diagnostic system and method that pipeline is desorbed of engine |
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| CN110821693A (en) * | 2019-11-04 | 2020-02-21 | 中国第一汽车股份有限公司 | Fault detection method and system for desorption control valve of fuel evaporation and discharge system |
| CN111103148A (en) * | 2019-12-18 | 2020-05-05 | 中国第一汽车股份有限公司 | Fuel evaporation system, blockage detection method and 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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| US9168829B2 (en) | 2013-07-17 | 2015-10-27 | Ford Global Technologies, Llc | Vapor storage device having a diffuser plate and dome |
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| CN109958554A (en) * | 2017-12-14 | 2019-07-02 | 现代自动车株式会社 | For diagnosing the method and tank purification system of the purge valve of tank purification system |
| CN109958554B (en) * | 2017-12-14 | 2022-08-26 | 现代自动车株式会社 | Method for diagnosing a purge valve of a canister purge system and canister purge system |
| CN109441671A (en) * | 2018-10-26 | 2019-03-08 | 安徽江淮汽车集团股份有限公司 | A kind of low diagnostic system and method that pipeline is desorbed of engine |
| CN110821693A (en) * | 2019-11-04 | 2020-02-21 | 中国第一汽车股份有限公司 | Fault detection method and system for desorption control valve of fuel evaporation and discharge system |
| CN111103148A (en) * | 2019-12-18 | 2020-05-05 | 中国第一汽车股份有限公司 | Fuel evaporation system, blockage detection method and 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 |
| CN112610367A (en) * | 2020-12-18 | 2021-04-06 | 上汽大通汽车有限公司 | Fault diagnosis method for carbon canister electromagnetic valve |
| CN112610367B (en) * | 2020-12-18 | 2022-10-04 | 上汽大通汽车有限公司 | Fault diagnosis method for carbon canister electromagnetic valve |
| CN112761807A (en) * | 2021-02-08 | 2021-05-07 | 联合汽车电子有限公司 | Fault diagnosis method, piston cooling system and vehicle |
| CN112761807B (en) * | 2021-02-08 | 2022-06-28 | 联合汽车电子有限公司 | Fault diagnosis method, piston cooling system and vehicle |
| US11542895B2 (en) | 2021-05-11 | 2023-01-03 | Ford Global Technologies, Llc | Method and system for determining vapor storage canister restriction |
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