CN105370421B - Fuel oil corrects diagnostic method and system - Google Patents
Fuel oil corrects diagnostic method and system Download PDFInfo
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- CN105370421B CN105370421B CN201410441983.2A CN201410441983A CN105370421B CN 105370421 B CN105370421 B CN 105370421B CN 201410441983 A CN201410441983 A CN 201410441983A CN 105370421 B CN105370421 B CN 105370421B
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Abstract
The present invention discloses a kind of fuel oil and corrects diagnostic method and system.This method includes：Corresponding diagnosis path is selected according to the operating mode of engine, wherein, for the first diagnosis limit value of idling operation setting and idling filter, for non-idling operation, second opinion limit value and non-idling filter are set, first diagnosis limit value includes the first partially dense limit value and first partially dilute limit value, and second opinion limit value includes the second partially dense limit value and second partially dilute limit value.
Description
Technical field
The present invention relates to fuel oils to correct diagnostic method and system.
Background technology
In the prior art, typically with ternary catalyzing unit and according to oxygen sensor signal to fuel oil carry out closed-loop control come
Reduce petrol engine emission.Short-term fuel oil amendment and long-term fuel oil amendment are used during closed-loop control.Short-term combustion
Oil corrects the oxygen sensor signal based on reaction oxygen concentration and calculates short-term fuel oil correction value, is promoted using the short-term fuel oil correction value
Mixed gas concentration regression theory air-fuel ratio.Long-term fuel oil amendment is for making fuel oil control adapt to the various Operation Conditions of engine
The modified poor adaptability of short-term fuel oil is made up, is changed based on current short-term fuel oil correction value and oxygen sensor signal
Become long-term fuel oil correction value.It can be to being calculated according to air inflow using obtained short-term fuel oil correction value and long-term fuel oil correction value
Obtained basic fuel injection amount compensates, to generate the distributive value of closed-loop control.
During closed-loop control, deviation will appear according to the modified control of long-term fuel oil, when this deviation is more than one
When fixed limit, it is more than defined level that may lead to emission.Therefore, it is necessary to carry out lasting examine to long-term fuel oil amendment
It is disconnected, and failure is reported when there is the failure mode for causing vehicle emission exceeded.
Invention content
A kind of fuel oil amendment diagnostic method is disclosed, including：Corresponding diagnosis path is selected according to the operating mode of engine,
In, for idling operation setting the first diagnosis limit value and idling filter, second opinion limit value and non-idle is set for non-idling operation
Fast filter, the first diagnosis limit value include the first partially dense limit value and first partially dilute limit value, and second opinion limit value includes second partially dense
Limit value and second partially dilute limit value.
A kind of fuel oil amendment diagnostic system is disclosed, which selects corresponding diagnosis path according to the operating mode of engine, should
System includes：Idling monitor diagnoses limit value for idling operation setting first, and includes idling filter, non-idling monitoring
Device is arranged second opinion limit value for non-idling operation, and includes non-idling filter, wherein the first diagnosis limit value includes the
One partially dense limit value and first partially dilute limit value, second opinion limit value include the second partially dense limit value and second partially dilute limit value.
Description of the drawings
After the specific implementation mode for having read the present invention with reference to attached drawing, those skilled in the art will be more clearly
Solve various aspects of the invention.It will be apparent to a skilled person that these attached drawings are used only for cooperation specific embodiment party
Formula illustrates technical scheme of the present invention, and is not intended to and is construed as limiting to protection scope of the present invention.
Fig. 1 shows the setting of diagnosis limit value during fuel oil amendment diagnosis.
Fig. 2 shows the settings that limit value is diagnosed during another fuel oil amendment diagnosis.
Fig. 3 is the flow chart of one embodiment that fuel oil corrects diagnostic method.
Specific implementation mode
Fuel oil amendment diagnosis disclosed by the invention utilizes the long-term fuel oil correction value of fuel oil closed-loop control system, and utilizes filter
Wave device carries out numerical filtering to the long-term fuel oil correction value and generates judgment value, by the judgment value and diagnosis limit value（Partially dense limit value/partially
Dilute limit value）Compare, to judge that fuel oil closed-loop control system whether there is failure.When the judgment value is less than dense limit value partially, then report
It has the partially dense failure of system；When the judgment value is more than dilute limit value partially, then the partially dilute failure of system is quoted.
Fig. 1 shows the setting of diagnosis limit value during fuel oil amendment diagnosis.In this process, using same partially dense limit value
（K_Rich）/ partially dilute limit value（K_Lean）To cope with two kinds of operating modes of idling and non-idling.When engine operates under idling, due to
Air inflow is small, and rotating speed is low, mixed gas combustion instability, therefore the modified deviation of fuel oil of the engine under idling operation is more than
The modified deviation of fuel oil of the engine under such as steady running condition.In Fig. 1, left side is long-term fuel oil amendment under idling operation
The scattered error of value, right side are the scattered error of long-term fuel oil correction value under non-idling operation.It can be seen that when engine is in idling operation
Correction value scattered error when being in moderate duty much larger than engine of the scattered error of long-term fuel oil correction value.Inventor has found this
In the case of, identical diagnosis limit value can be such that the diagnosis accuracy of non-idling operation reduces（Susceptibility is low）, make examining for idling operation
Disconnected robustness is poor（Susceptibility is high）.In this case, fuel oil amendment diagnosis process is difficult to accuracy and robust in diagnosis
Balance is made between property.
Fig. 2 shows the settings that limit value is diagnosed during another fuel oil amendment diagnosis.In this process, using different partially dense
Limit value（K_Rich）/ partially dilute limit value（K_Lean）To cope with two kinds of operating modes of idling and non-idling.The diagnosis limit value packet of idling operation
Include partially dilute limit value Kidle_ Lean and partially dense limit value KidleThe diagnosis limit value of _ Rich, non-idling operation include partially dilute limit value Koffidle_
Lean and partially dense limit value Koffidle_Rich.The process is directed to idling and non-idling respectively by two independent diagnosis paths
The long-term fuel oil correction value of closed-loop control carries out deviation monitoring.Each diagnosis path has corresponding filter and diagnosis limit value, from
And make entire diagnosis is given in idling/two kinds of non-idling operating mode to carry out judging respectively reporting with failure.According to the program, have
Sharp ground, while keeping diagnosis accuracy, can improve the robustness of diagnosis, reduce the probability of wrong diagnosis.
Fig. 3 is the flow chart of one embodiment that fuel oil corrects diagnostic method.
As shown, after vehicle brings into operation, judge whether fuel oil closed-loop control system has been enter into closed-loop control.
After entering closed-loop control, judge that engine is in idling mode（Idle）When, select idling to monitor path, idling
Monitor utilizes long-term fuel oil correction value（Longterm）, through idling filter（Filteridle）Numerical filtering is carried out to obtain surely
Fixed judgment value（Lidle）, main filter function is as follows：
Lidle(n) = Lidle(n-1) + Filteridle* (Longterm - Lidle(n-1))。
Filter coefficient Filter can be adjustedidleSize, the iteration step length of judgment value can be made adjusted, flexibly
Adjust the sensitivity of the diagnosis under idling mode.
Then, it will determine that value LidleWith the diagnosis limit value in idling monitor（Kidle_ Lean and Kidle_Rich）Compared
Compared with as judgment value LidleMore than partially dilute limit value Kidle_ Lean then quotes the partially dilute failure of fuel oil closed-loop control system；Work as judgment value
LidleMore than partially dense limit value Kidle_ Rich then quotes the partially dense failure of fuel oil closed-loop control system.
After entering closed-loop control, judge that engine is in idling mode（Offidle）When, select non-idling monitoring road
Diameter, non-idling monitor utilize long-term fuel oil correction value（Longterm）, by non-idling filter（Filteroffidle）Into
Line number value filtering obtains stable judgment value（Loffidle）, main filter function is：
Loffidle(n) = Loffidle(n-1) + FilterOffidle* (Longterm - Loffidle(n-1))。
Filter coefficient Filter can be adjustedOffidleSize, the iteration step length of judgment value can be made adjusted, spirit
The sensitivity of diagnosis under adjustment idling mode living.
Then, it will determine that value LoffidleWith the diagnosis limit value in non-idling monitor（Koffidle_ Lean and Koffidle_
Rich）It is compared, works as judgment value（Loffidle）More than partially dilute limit value KoffidleIt is inclined then to quote fuel oil closed-loop control system by _ Lean
Dilute failure；When judgment value is more than partially dense limit value Koffidle_ Rich then quotes the partially dense failure of fuel oil closed-loop control system.
It is according to the present invention kind of fuel oil amendment diagnostic method below, including：
Select corresponding diagnosis path according to the operating mode of engine, wherein for the first diagnosis limit value of idling operation setting and
Second opinion limit value and non-idling filter is arranged for non-idling operation in idling filter, and the first diagnosis limit value includes first inclined
Dense limit value and first partially dilute limit value, second opinion limit value include the second partially dense limit value and second partially dilute limit value.
In one embodiment, when judging that engine is in idling operation, long-term fuel oil is repaiied using idling filter
Positive value carries out numerical filtering and generates the first judgment value, by first judgment value compared with the first diagnosis limit value, to judge that fuel oil closes
Ring control system whether there is failure,
When first judgment value is less than the first dense limit value partially, then the partially dense failure of fuel oil closed-loop control system is quoted；When this
First judgment value be more than first partially dilute limit value when, then quote the partially dilute failure of fuel oil closed-loop control system；
When judging that engine is in non-idling operation, numerical value is carried out to long-term fuel oil correction value using non-idling filter
Filtering generates the second judgment value, by second judgment value compared with second opinion limit value, to judge that fuel oil closed-loop control system is
It is no there are failure,
When second judgment value is less than the second dense limit value partially, then the partially dense failure of fuel oil closed-loop control system is quoted；When this
Second judgment value be more than second partially dilute limit value when, then quote the partially dilute failure of fuel oil closed-loop control system.
It is that according to the present invention kind of fuel oil corrects diagnostic system below.Fuel oil corrects diagnostic system can be from fuel oil closed loop control
Whether system processed obtains the quantity of state for whether being in closed-loop control, long-term fuel oil correction value and everywhere in the quantity of state of idling.
Diagnostic system then contains idling/non-idling monitor, and corresponding filter is provided in each monitor and is used to calculate judgment value,
Then it is provided with the diagnosis limit value of idling/non-idling in each monitor, judges whether fuel oil closed loop control occur for monitor
Partially dense/dilute failure of system processed.
The system selects to diagnose path accordingly according to the operating mode of engine, which includes：
Idling monitor diagnoses limit value for idling operation setting first, and includes idling filter, non-idling monitoring
Device is arranged second opinion limit value for non-idling operation, and includes non-idling filter, wherein the first diagnosis limit value includes the
One partially dense limit value and first partially dilute limit value, second opinion limit value include the second partially dense limit value and second partially dilute limit value.
In one embodiment, it when the idling monitor judges that engine is in idling operation, is filtered using idling
Device carries out numerical filtering to long-term fuel oil correction value and generates the first judgment value, by first judgment value and the first diagnosis limit value ratio
Compared with to judge that fuel oil closed-loop control system is then quoted with the presence or absence of failure when first judgment value is less than the first dense limit value partially
The partially dense failure of fuel oil closed-loop control system；When first judgment value is more than first dilute limit value partially, then fuel oil closed-loop control is quoted
The partially dilute failure of system；When the non-idling monitor judges that engine is in non-idling operation, non-idling filter pair is utilized
Long-term fuel oil correction value carries out numerical filtering and generates the second judgment value, by second judgment value compared with second opinion limit value, comes
Judge that fuel oil closed-loop control system whether there is failure, when second judgment value is less than the second dense limit value partially, then quotes fuel oil
The partially dense failure of closed-loop control system；When second judgment value is more than second dilute limit value partially, then fuel oil closed-loop control system is quoted
Partially dilute failure.
It will be understood by those skilled in the art that the idling monitor, non-idling monitor, idling filter, non-idling
Filter can be realized by software module or electronic circuit.
By the description of embodiment of above, those skilled in the art are it is understood that without departing from the present invention
Spirit and scope in the case of, can also to the present invention specific implementation mode make various changes and replacement.These change and
Replacement is all fallen in claims of the present invention limited range.
Claims (2)
1. a kind of fuel oil corrects diagnostic method, which is characterized in that including：
Corresponding diagnosis path is selected according to the operating mode of engine, wherein for the first diagnosis limit value of idling operation setting and idling
Second opinion limit value and non-idling filter is arranged for non-idling operation in filter, and the first diagnosis limit value includes the first partially dense limit
Value and first partially dilute limit value, second opinion limit value include the second partially dense limit value and second partially dilute limit value；
Wherein, when judging that engine is in idling operation, numerical value filter is carried out to long-term fuel oil correction value using idling filter
Wave generates the first judgment value, by first judgment value compared with the first diagnosis limit value, whether to judge fuel oil closed-loop control system
There are failure,
When first judgment value is less than the first dense limit value partially, then the partially dense failure of fuel oil closed-loop control system is quoted；When this first
Judgment value be more than first partially dilute limit value when, then quote the partially dilute failure of fuel oil closed-loop control system；
When judging that engine is in non-idling operation, numerical filtering is carried out to long-term fuel oil correction value using non-idling filter
The second judgment value is generated, by second judgment value compared with second opinion limit value, to judge whether fuel oil closed-loop control system deposits
In failure,
When second judgment value is less than the second dense limit value partially, then the partially dense failure of fuel oil closed-loop control system is quoted；When this second
Judgment value be more than second partially dilute limit value when, then quote the partially dilute failure of fuel oil closed-loop control system.
2. a kind of fuel oil corrects diagnostic system, which is characterized in that the system selects corresponding diagnosis road according to the operating mode of engine
Diameter, the system include：
Idling monitor diagnoses limit value for idling operation setting first, and includes idling filter,
Non- idling monitor is arranged second opinion limit value for non-idling operation, and includes non-idling filter,
Wherein, the first diagnosis limit value includes the first partially dense limit value and first partially dilute limit value, and second opinion limit value includes second partially dense
Limit value and second partially dilute limit value；
Wherein, when the idling monitor judges that engine is in idling operation, long-term fuel oil is repaiied using idling filter
Positive value carries out numerical filtering and generates the first judgment value, by first judgment value compared with the first diagnosis limit value, to judge that fuel oil closes
Ring control system whether there is failure, when first judgment value is less than the first dense limit value partially, then quote fuel oil closed-loop control system
The partially dense failure of system；When first judgment value is more than first dilute limit value partially, then the partially dilute failure of fuel oil closed-loop control system is quoted；
When the non-idling monitor judges that engine is in non-idling operation, long-term fuel oil is repaiied using non-idling filter
Positive value carries out numerical filtering and generates the second judgment value, by second judgment value compared with second opinion limit value, to judge that fuel oil closes
Ring control system whether there is failure, when second judgment value is less than the second dense limit value partially, then quote fuel oil closed-loop control system
The partially dense failure of system；When second judgment value is more than second dilute limit value partially, then the partially dilute failure of fuel oil closed-loop control system is quoted.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410441983.2A CN105370421B (en) | 2014-09-02 | 2014-09-02 | Fuel oil corrects diagnostic method and system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410441983.2A CN105370421B (en) | 2014-09-02 | 2014-09-02 | Fuel oil corrects diagnostic method and system |
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| CN105370421A CN105370421A (en) | 2016-03-02 |
| CN105370421B true CN105370421B (en) | 2018-08-07 |
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| CN111691997B (en) * | 2020-06-22 | 2021-07-20 | 安徽江淮汽车集团股份有限公司 | Gasoline engine fuel closed-loop control method, equipment, storage medium and device |
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| CN102146848A (en) * | 2010-02-05 | 2011-08-10 | 通用汽车环球科技运作有限责任公司 | Power-based engine speed control |
| CN102748150A (en) * | 2011-04-21 | 2012-10-24 | 三菱电机株式会社 | Control device for internal combustion engine and method of controlling internal combustion engine |
| CN102877953A (en) * | 2012-09-26 | 2013-01-16 | 三一重工股份有限公司 | Engine speed control system and engineering machine |
| CN103161594A (en) * | 2013-03-01 | 2013-06-19 | 无锡威孚高科技集团股份有限公司 | Oil quantity management control system and method for diesel engine electric control voltage accumulation distributed type common rail system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6311680B1 (en) * | 2000-03-21 | 2001-11-06 | Ford Global Technologies, Inc. | Active adaptive bias for closed loop air/fuel control system |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102146848A (en) * | 2010-02-05 | 2011-08-10 | 通用汽车环球科技运作有限责任公司 | Power-based engine speed control |
| CN102748150A (en) * | 2011-04-21 | 2012-10-24 | 三菱电机株式会社 | Control device for internal combustion engine and method of controlling internal combustion engine |
| CN102877953A (en) * | 2012-09-26 | 2013-01-16 | 三一重工股份有限公司 | Engine speed control system and engineering machine |
| CN103161594A (en) * | 2013-03-01 | 2013-06-19 | 无锡威孚高科技集团股份有限公司 | Oil quantity management control system and method for diesel engine electric control voltage accumulation distributed type common rail system |
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