CN109030010A - One kind being used for engine fire detection method and device - Google Patents
One kind being used for engine fire detection method and device Download PDFInfo
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- CN109030010A CN109030010A CN201810686684.3A CN201810686684A CN109030010A CN 109030010 A CN109030010 A CN 109030010A CN 201810686684 A CN201810686684 A CN 201810686684A CN 109030010 A CN109030010 A CN 109030010A
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- G—PHYSICS
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
- G01M15/11—Testing internal-combustion engines by detecting misfire
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Abstract
The invention discloses one kind to be used for engine fire detection method and device, this method comprises: acquiring the original tach signal of engine in real time by the crankshaft-signal sensor of engine；The original tach signal of the engine is corrected and filtered accordingly, each cylinder fluctuation of speed signal corresponding with work by combustion is obtained；Detection window value is determined according to the revolving speed of the engine, and Fourier transformation is carried out to the fluctuation of speed signal in the detection window value, obtains each cylinder first harmonic amplitude；Misfire determining is carried out using first harmonic amplitude described in each cylinder as characteristic signal.Accurate detection engine fire incidence is realized through the invention, and specifically navigates to the cylinder that catches fire, to avoid the damage and deterioration of emission that lead to engine and its associated components due to engine fire.
Description
Technical field
The present invention relates to engine detection technique fields, are used for engine fire detection method and dress more particularly to one kind
It sets.
Background technique
It in the prior art, is to judge each cylinder expansion stroke by acquiring engine speed for engine fire detection
Characteristic value is compared by the acceleration between the rotating speed acceleration or respective cylinder in stage as the characteristic value caught fire with threshold value,
It catches fire to judge that engine respective cylinder whether there is.When some cylinder catches fire, the cylinder that catches fire is in the expansion stroke stage, accelerates
Degree can reduce compared with the cylinder not caught fire, and the cylinder that the catches fire corresponding expansion stroke stage, and mean speed also can be smaller, causes
The acceleration to catch fire between cylinder and the cylinder that do not catch fire becomes larger.Therefore, by judging that the acceleration in each cylinder expansion stroke stage carries out
It catches fire detection, it is high to engine speed and burden requirement.When engine work, the fluctuation of revolving speed shows as engine angular motion
The variation of amount, and in underload, the variation of angular momentum caused by work by combustion is faint, therefore, catches fire and corresponds to engine when occurring
Whether rotation speed change is unobvious, be difficult to distinguish and catch fire；Meanwhile with the raising of revolving speed, engine angular momentum is with revolving speed
Increase in quadratic power, do work in identical situation in each cylinder, angular momentum fluctuation is opposite to be reduced, and revolving speed when occurring that catches fire accelerates
It spends unobvious.
In these cases, detection of catching fire is carried out with the acceleration in each cylinder expansion stroke stage, is easy to happen erroneous judgement, no
Can accurately detect and catch fire, therefore, it is necessary to carry out detection of catching fire in confining load and revolving speed section, that is, by judge respective cylinder it
Between acceleration carry out misfire diagnosis, can have biggish probability cannot correctly judge the cylinder that catches fire.When not catching fire, start
The each cylinder working consistency of machine is higher, and the acceleration between cylinder and cylinder is smaller；When catching fire, due to some cylinder or certain is several
Cylinder does not work, and the running balance of engine entirety is broken, and causes engine speed to fluctuate in a working cycles, at this moment starts
Acceleration between machine respective cylinder can become larger.When engine catches fire under different revolving speeds and load, fluctuation of speed situation
Inconsistent, the engine speed that the cylinder that catches fire corresponds to expansion stroke can not necessarily decline at once, therefore, lead to not correctly judge
Which cylinder catches fire.
Summary of the invention
It is a kind of for engine fire detection method and device it is an object of the invention to propose, to realize accurate detection hair
Motivation is caught fire incidence, and navigates to the cylinder that specifically catches fire, to avoid leading to engine and its correlation due to engine fire
The damage and deterioration of emission of component.
In order to achieve the above objectives, the present invention provides following technical schemes:
One kind being used for engine fire detection method, comprising:
The original tach signal of engine is acquired in real time by the crankshaft-signal sensor of engine；
The original tach signal of the engine is corrected and filtered accordingly, it is corresponding with work by combustion to obtain each cylinder
Fluctuation of speed signal；
Detection window value is determined according to the revolving speed of the engine, and to the fluctuation of speed in the detection window value
Signal carries out Fourier transformation, obtains each cylinder first harmonic amplitude；
Misfire determining is carried out using first harmonic amplitude described in each cylinder as characteristic signal.
Further, the original tach signal of the engine is corrected and is filtered accordingly, obtain each cylinder and burning
Do work the corresponding fluctuation of speed signal the step of, comprising:
The original tach signal of the engine is corrected accordingly, obtains the fluctuation of speed caused by each cylinder work by combustion
Signal；
By bandpass filtering to the engine combustion do work caused by fluctuation of speed signal be filtered, extract each cylinder with
The corresponding fluctuation of speed signal of work by combustion.
Further, described the step of first harmonic amplitude described in each cylinder is subjected to misfire determining as characteristic signal, tool
Body are as follows:
First harmonic amplitude described in each cylinder and first harmonic amplitude when not catching fire are compared, determine whether to deposit
It is catching fire.
Further, first harmonic amplitude described in each cylinder and first harmonic signal when not catching fire are compared,
Determine whether there is the step of catching fire, comprising:
Judge whether first harmonic amplitude described in each cylinder and the ratio of standard amplitude are less than first threshold；
If so, being judged to catching fire, if it is not, being then judged to not catching fire.
Further, first harmonic amplitude described in each cylinder and first harmonic signal when not catching fire are compared,
Determine whether there is the step of catching fire, comprising:
First harmonic amplitude described in each cylinder is compared with second threshold, the second threshold is not occur under same operating condition
First harmonic amplitude when catching fire；
If the first harmonic amplitude is less than the second threshold, it is judged to catching fire；
If the first harmonic amplitude is greater than the second threshold, it is judged to not catching fire.
One kind being used for engine fire detection device, comprising:
First processing units acquire the original revolving speed letter of engine for the crankshaft-signal sensor by engine in real time
Number；
The second processing unit obtains each for the original tach signal of the engine to be corrected and filtered accordingly
Cylinder fluctuation of speed signal corresponding with work by combustion；
Third processing unit, for determining detection window value according to the revolving speed of the engine, and to the detection window
The fluctuation of speed signal in value carries out Fourier transformation, obtains each cylinder first harmonic amplitude；
Fourth processing unit, for carrying out misfire determining for first harmonic amplitude described in each cylinder as characteristic signal.
Further, described the second processing unit, comprising:
Amending unit obtains each cylinder work by combustion for being corrected accordingly to the original tach signal of the engine
Caused fluctuation of speed signal；
Filter unit, for being filtered by bandpass filtering to fluctuation of speed signal caused by engine combustion acting
Wave extracts each cylinder fluctuation of speed signal corresponding with work by combustion.
Further, the fourth processing unit is used for:
First harmonic amplitude described in each cylinder and first harmonic amplitude when not catching fire are compared, determine whether to deposit
It is catching fire.
Further, the fourth processing unit includes:
Judging unit, for judging the ratio of first harmonic amplitude described in each cylinder and standard amplitude whether less than the first threshold
Value；
If so, being judged to catching fire, if it is not, being then judged to not catching fire.
Further, the fourth processing unit includes:
Comparing unit, for comparing first harmonic amplitude described in each cylinder with second threshold, the second threshold is same
First harmonic amplitude when not catching fire under sample operating condition；
If the first harmonic amplitude is less than the second threshold, it is judged to catching fire；
If the first harmonic amplitude is greater than the second threshold, it is judged to not catching fire.
It can be seen via above technical scheme that compared with prior art, the invention discloses one kind to be used for engine fire
Detection method and device, this method comprises: acquiring the original revolving speed letter of engine in real time by the crankshaft-signal sensor of engine
Number；The original tach signal of the engine is corrected and filtered accordingly, each cylinder revolving speed corresponding with work by combustion is obtained
Fluctuation signal；Detection window value is determined according to the revolving speed of the engine, and to the revolving speed wave in the detection window value
Dynamic signal carries out Fourier transformation, obtains each cylinder first harmonic amplitude；Using first harmonic amplitude described in each cylinder as characteristic signal
Carry out misfire determining.The tach signal when present invention is by measurement engine towing astern, obtains engine Honda nature working order
Under rotary speed property, amendment the original tach signal of engine obtain caused rotation speed change of doing work, avoid high revolving speed or underload
Under, the unconspicuous situation of signal of doing work；By bandpass filtering, fluctuation of speed signal when each cylinder of engine does work is extracted, avoids sending out
The influence of motivation tourist bus, conducive to cylinder is accurately sentenced；Under different rotating speeds, acting burning velocity is identical, and angular duration is different, and dynamic is adjusted
Whole detection window, the accurate fluctuation for extracting acting signal, avoids other signal interferences, influences accurately to sentence cylinder；By extracting
Acting signal carry out Fourier transformation and obtain first harmonic amplitude, and carry out misfire determining as characteristic signal, rather than logical
Rotational speed difference is crossed to judge, improves the anti-interference ability of algorithm；Each cylinder is kept away by being compared with characteristic signal when not catching fire
Erroneous judgement caused by each cylinder consistency is exempted from.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is provided in an embodiment of the present invention a kind of for engine fire detection method flow chart；
Fig. 2 is a kind of specific implementation flow chart of step S102 provided in an embodiment of the present invention；
Fig. 3 is that the first harmonic amplitude before and after respective cylinder provided in an embodiment of the present invention is caught fire changes schematic diagram；
Fig. 4 is provided in an embodiment of the present invention another for engine fire detection method flow chart；
Fig. 5 be it is provided in an embodiment of the present invention another be used for engine fire detection method flow chart；
Fig. 6 is provided in an embodiment of the present invention a kind of for engine fire structure diagram of detection device.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
As shown in Figure 1, the embodiment of the invention provides one kind to be used for engine fire detection method, this method specifically can be with
Include the following steps:
S101, the original tach signal of engine is acquired by the crankshaft-signal sensor of engine in real time.
In the embodiment of the present invention, the original tach signal of engine is acquired by the crankshaft-signal sensor of engine in real time,
Subsequent amendment and filtering are carried out by initial signal of the original tach signal of engine.
It should be noted that if not handling tach signal, each inspection of crankshaft sensor of processing most original can also be passed through
The time for surveying tooth, it can also judge to catch fire by subsequent same treatment, and engine rotational speed signal is exactly by detecting tooth
Time calculates the real-time revolving speed of engine.
S102, the original tach signal of the engine is corrected and is filtered accordingly, obtain each cylinder and work by combustion
Corresponding fluctuation of speed signal.
As shown in Fig. 2, being a kind of specific implementation of step S102 provided in an embodiment of the present invention, specifically, to institute
It states the original tach signal of engine to be corrected and filtered accordingly, obtains each cylinder fluctuation of speed signal corresponding with work by combustion
The step of, it can specifically include:
S201, the original tach signal of the engine is corrected accordingly, obtains turning caused by each cylinder work by combustion
Fast fluctuation signal.
Original tach signal is modified it should be noted that can use engine rotational speed signal when towing astern, is obtained
Fluctuation of speed signal caused by each cylinder work by combustion.
S202, fluctuation of speed signal caused by engine combustion acting is filtered by bandpass filtering, is extracted
Each cylinder fluctuation of speed signal corresponding with work by combustion.
It should be noted that by being filtered by fluctuation of speed signal caused by obtained each cylinder work by combustion after amendment
Wave extracts each cylinder fluctuation of speed signal corresponding with work by combustion by bandpass filter.
S103, detection window value is determined according to the revolving speed of the engine, and to turning described in the detection window value
Fast fluctuation signal carries out Fourier transformation, obtains each cylinder first harmonic amplitude.
In the embodiment of the present invention, since the fluctuation of revolving speed shows as the variation of engine angular momentum, engine turns
Fast different, then the detection window value finally determined is also just different, i.e., the quantity of finally obtained fluctuation of speed signal is different.
S104, misfire determining is carried out using first harmonic amplitude described in each cylinder as characteristic signal.
In the embodiment of the present invention, the step that misfire determining is carried out using first harmonic amplitude described in each cylinder as characteristic signal
Suddenly, it is specifically as follows:
First harmonic amplitude described in each cylinder and first harmonic amplitude when not catching fire are compared, determine whether to deposit
It is catching fire.
Specifically, as shown in figure 3, the first harmonic amplitude of respective cylinder can sharp fall after catching fire.
It should be noted that the present invention, which passes through the work by combustion fluctuation of speed signal extracted, carries out Fourier transformation,
First harmonic amplitude is obtained, carries out misfire determining as characteristic signal, rather than is judged by rotational speed difference, the anti-of algorithm is improved
Interference performance.In addition, each cylinder is with characteristic signal when not catching fire by being compared, caused by avoiding each cylinder consistency
Erroneous judgement.
As shown in figure 4, this method is specific to be provided in an embodiment of the present invention another for engine fire detection method
It may include steps of:
S401, the original tach signal of engine is acquired by the crankshaft-signal sensor of engine in real time.
In the embodiment of the present invention, the original tach signal of engine is acquired by the crankshaft-signal sensor of engine in real time,
Subsequent amendment and filtering are carried out by initial signal of the original tach signal of engine.
S402, the original tach signal of the engine is corrected and is filtered accordingly, obtain each cylinder and work by combustion
Corresponding fluctuation of speed signal.
S403, detection window value is determined according to the revolving speed of the engine, and to turning described in the detection window value
Fast fluctuation signal carries out Fourier transformation, obtains each cylinder first harmonic amplitude.
In the embodiment of the present invention, since the fluctuation of revolving speed shows as the variation of engine angular momentum, engine turns
Fast different, then the detection window value finally determined is also just different, i.e., the quantity of finally obtained fluctuation of speed signal is different.
S404, judge whether first harmonic amplitude described in each cylinder and the ratio of standard amplitude are less than first threshold；
If so, being judged to catching fire, if it is not, being then judged to not catching fire.
It should be noted that in the embodiment of the present invention, standard amplitude be it is preset according to specific engine speed,
First threshold is set according to specific engine speed and fluctuation signal.
As shown in figure 5, for it is provided in an embodiment of the present invention another be used for engine fire detection method, this method is specific
It may include steps of:
S501, the original tach signal of engine is acquired by the crankshaft-signal sensor of engine in real time.
In the embodiment of the present invention, the original tach signal of engine is acquired by the crankshaft-signal sensor of engine in real time,
Subsequent amendment and filtering are carried out by initial signal of the original tach signal of engine.
S502, the original tach signal of the engine is corrected and is filtered accordingly, obtain each cylinder and work by combustion
Corresponding fluctuation of speed signal.
S503, detection window value is determined according to the revolving speed of the engine, and to turning described in the detection window value
Fast fluctuation signal carries out Fourier transformation, obtains each cylinder first harmonic amplitude.
In the embodiment of the present invention, since the fluctuation of revolving speed shows as the variation of engine angular momentum, engine turns
Fast different, then the detection window value finally determined is also just different, i.e., the quantity of finally obtained fluctuation of speed signal is different.
S504, first harmonic amplitude and second threshold described in each cylinder are compared, the second threshold is under same operating condition
First harmonic amplitude when not catching fire；
If S505, the first harmonic amplitude are less than the second threshold, it is judged to catching fire；
If S506, the first harmonic amplitude are greater than the second threshold, it is judged to not catching fire.
It should be noted that above-mentioned second threshold is one when not catching fire under same operating condition in the embodiment of the present invention
Subharmonic amplitude refers to that corresponding engine speed and operating status are identical under same operating condition.
To sum up, the embodiment of the invention provides one kind to be used for engine fire detection method, this method comprises: by starting
The crankshaft-signal sensor of machine acquires the original tach signal of engine in real time；The original tach signal of the engine is carried out corresponding
Amendment and filtering, obtain each cylinder fluctuation of speed signal corresponding with work by combustion；It is determined and is examined according to the revolving speed of the engine
Window value is surveyed, and Fourier transformation is carried out to the fluctuation of speed signal in the detection window value, it is once humorous to obtain each cylinder
Wave amplitude；Misfire determining is carried out using first harmonic amplitude described in each cylinder as characteristic signal.The present invention is fallen by measuring engine
Tach signal when dragging obtains the rotary speed property under engine Honda nature working order, corrects the original tach signal of engine
Caused rotation speed change of doing work is obtained, is avoided under high revolving speed or underload, the unconspicuous situation of signal of doing work；It is filtered by band logical
Wave extracts fluctuation of speed signal when each cylinder of engine does work, avoids the influence of engine tourist bus, conducive to cylinder is accurately sentenced；Difference turns
Under speed, acting burning velocity is identical, and angular duration is different, and dynamic adjusts detection window, accurately extracts the fluctuation of acting signal,
Other signal interferences are avoided, influence accurately to sentence cylinder；It is obtained by the acting signal progress Fourier transformation extracted primary humorous
Wave amplitude, and misfire determining is carried out as characteristic signal, rather than judged by rotational speed difference, improve the anti-interference energy of algorithm
Power；Each cylinder avoids erroneous judgement caused by each cylinder consistency by being compared with characteristic signal when not catching fire.
Method is described in detail in aforementioned present invention disclosed embodiment, diversified forms can be used for method of the invention
Device realize that therefore the invention also discloses a kind of devices, and specific embodiment is given below and is described in detail.
As shown in fig. 6, the embodiment of the invention provides one kind to be used for engine fire detection device, which specifically can be with
It include: first processing units 601, the second processing unit 602, third processing unit 603 and fourth processing unit 604, in which:
First processing units 601, for acquiring the original revolving speed of engine in real time by the crankshaft-signal sensor of engine
Signal；
The second processing unit 602 is obtained for the original tach signal of the engine to be corrected and filtered accordingly
Each cylinder fluctuation of speed signal corresponding with work by combustion；
Third processing unit 603, for determining detection window value according to the revolving speed of the engine, and to the detection window
The fluctuation of speed signal in mouth value carries out Fourier transformation, obtains each cylinder first harmonic amplitude；
Fourth processing unit 604, for carrying out misfire determining for first harmonic amplitude described in each cylinder as characteristic signal.
Further, described the second processing unit 602 may include:
Amending unit 6021 obtains each cylinder burning for being corrected accordingly to the original tach signal of the engine
Fluctuation of speed signal caused by doing work；
Filter unit 6022, for by bandpass filtering to the engine combustion do work caused by fluctuation of speed signal into
Row filtering, extracts each cylinder fluctuation of speed signal corresponding with work by combustion.
Further, the fourth processing unit 604, is specifically used for:
First harmonic amplitude described in each cylinder and first harmonic amplitude when not catching fire are compared, determine whether to deposit
It is catching fire.
Further, the fourth processing unit 604 includes:
Judging unit, for judging the ratio of first harmonic amplitude described in each cylinder and standard amplitude whether less than the first threshold
Value；
If so, being judged to catching fire, if it is not, being then judged to not catching fire.
Further, the fourth processing unit 604 includes:
Comparing unit, for comparing first harmonic amplitude described in each cylinder with second threshold, the second threshold is same
First harmonic amplitude when not catching fire under sample operating condition；
If the first harmonic amplitude is less than the second threshold, it is judged to catching fire；
If the first harmonic amplitude is greater than the second threshold, it is judged to not catching fire.
The embodiment of the invention provides one kind to be used for engine fire detection device, and the present invention passes through measurement engine towing astern
When tach signal, obtain the rotary speed property under engine Honda nature working order, the amendment original tach signal of engine obtains
It to caused rotation speed change of doing work, avoids under high revolving speed or underload, the unconspicuous situation of signal of doing work；By bandpass filtering,
Fluctuation of speed signal when each cylinder of engine does work is extracted, the influence of engine tourist bus is avoided, conducive to cylinder is accurately sentenced；Different rotating speeds
Under, acting burning velocity is identical, and angular duration is different, and dynamic adjusts detection window, and the accurate fluctuation for extracting acting signal is kept away
Exempt from other signal interferences, influences accurately to sentence cylinder；Fourier transformation, which is carried out, by the acting signal extracted obtains first harmonic
Amplitude, and misfire determining is carried out as characteristic signal, rather than judged by rotational speed difference, improve the anti-interference ability of algorithm；
Each cylinder avoids erroneous judgement caused by each cylinder consistency by being compared with characteristic signal when not catching fire.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion so that article or equipment including a series of elements not only include those elements, but also is wrapped
Other elements that are not explicitly listed are included, or further include for this article or the intrinsic element of equipment.Do not having more
In the case where more limitations, the element that is limited by sentence "including a ...", it is not excluded that include above-mentioned element article or
There is also other identical elements in person's equipment.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (10)
1. one kind is used for engine fire detection method characterized by comprising
The original tach signal of engine is acquired in real time by the crankshaft-signal sensor of engine；
The original tach signal of the engine is corrected and filtered accordingly, each cylinder revolving speed corresponding with work by combustion is obtained
Fluctuation signal；
Detection window value is determined according to the revolving speed of the engine, and to the fluctuation of speed signal in the detection window value
Fourier transformation is carried out, each cylinder first harmonic amplitude is obtained；
Misfire determining is carried out using first harmonic amplitude described in each cylinder as characteristic signal.
2. the method according to claim 1, wherein being repaired accordingly to the original tach signal of the engine
Just and filtering, the step of obtaining each cylinder corresponding with work by combustion fluctuation of speed signal, comprising:
The original tach signal of the engine is corrected accordingly, obtains the letter of the fluctuation of speed caused by each cylinder work by combustion
Number；
Fluctuation of speed signal caused by being done work by bandpass filtering to the engine combustion is filtered, and extracts each cylinder and burning
Do work corresponding fluctuation of speed signal.
3. the method according to claim 1, wherein described believe first harmonic amplitude described in each cylinder as feature
Number carry out misfire determining the step of, specifically:
First harmonic amplitude described in each cylinder and first harmonic amplitude when not catching fire are compared, determines whether to exist and lose
Fire.
4. according to the method described in claim 3, it is characterized in that, by first harmonic amplitude described in each cylinder and when not catching fire
First harmonic signal compare, determine whether there is the step of catching fire, comprising:
Judge whether first harmonic amplitude described in each cylinder and the ratio of standard amplitude are less than first threshold；
If so, being judged to catching fire, if it is not, being then judged to not catching fire.
5. according to the method described in claim 3, it is characterized in that, by first harmonic amplitude described in each cylinder and when not catching fire
First harmonic signal compare, determine whether there is the step of catching fire, comprising:
First harmonic amplitude described in each cylinder is compared with second threshold, the second threshold is not catch fire under same operating condition
When first harmonic amplitude；
If the first harmonic amplitude is less than the second threshold, it is judged to catching fire；
If the first harmonic amplitude is greater than the second threshold, it is judged to not catching fire.
6. one kind is used for engine fire detection device characterized by comprising
First processing units, for acquiring the original tach signal of engine in real time by the crankshaft-signal sensor of engine；
The second processing unit, for the original tach signal of the engine to be corrected and is filtered accordingly, obtain each cylinder with
The corresponding fluctuation of speed signal of work by combustion；
Third processing unit, for determining detection window value according to the revolving speed of the engine, and in the detection window value
The fluctuation of speed signal carry out Fourier transformation, obtain each cylinder first harmonic amplitude；
Fourth processing unit, for carrying out misfire determining for first harmonic amplitude described in each cylinder as characteristic signal.
7. device according to claim 6, which is characterized in that described the second processing unit, comprising:
Amending unit obtains each cylinder work by combustion and causes for being corrected accordingly to the original tach signal of the engine
Fluctuation of speed signal；
Filter unit, for being filtered by bandpass filtering to fluctuation of speed signal caused by engine combustion acting,
Extract each cylinder fluctuation of speed signal corresponding with work by combustion.
8. device according to claim 6, which is characterized in that the fourth processing unit is used for:
First harmonic amplitude described in each cylinder and first harmonic amplitude when not catching fire are compared, determines whether to exist and lose
Fire.
9. device according to claim 8, which is characterized in that the fourth processing unit includes:
Judging unit, for judging whether first harmonic amplitude described in each cylinder and the ratio of standard amplitude are less than first threshold；
If so, being judged to catching fire, if it is not, being then judged to not catching fire.
10. device according to claim 8, which is characterized in that the fourth processing unit includes:
Comparing unit, for comparing first harmonic amplitude described in each cylinder with second threshold, the second threshold is same work
First harmonic amplitude when not catching fire under condition；
If the first harmonic amplitude is less than the second threshold, it is judged to catching fire；
If the first harmonic amplitude is greater than the second threshold, it is judged to not catching fire.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111120094A (en) * | 2019-11-29 | 2020-05-08 | 潍柴动力股份有限公司 | Engine fire detection method and device, storage medium and terminal |
| CN111140354A (en) * | 2019-12-20 | 2020-05-12 | 潍柴动力股份有限公司 | Method and control device for detecting fire of whole vehicle |
| CN114483350A (en) * | 2022-04-02 | 2022-05-13 | 潍柴动力股份有限公司 | Engine misfire diagnosis method and device |
| CN114635794A (en) * | 2022-03-07 | 2022-06-17 | 潍柴动力股份有限公司 | Combustion condition determining method and device, electronic equipment and storage medium |
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