CN109030009A - 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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- CN109030009A CN109030009A CN201810686156.8A CN201810686156A CN109030009A CN 109030009 A CN109030009 A CN 109030009A CN 201810686156 A CN201810686156 A CN 201810686156A CN 109030009 A CN109030009 A CN 109030009A
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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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- Combustion & Propulsion (AREA)
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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 one working cycles of engine in real time by the crankshaft-signal sensor of engine；The original tach signal of one working cycles of the engine is subjected to Fourier transformation, obtains first harmonic amplitude and first harmonic phase；Misfire determining is carried out using the first harmonic amplitude and the first harmonic phase as characteristic signal.The present invention is analyzed by acquiring the original tach signal of engine in real time, by engine as an entirety, by the phase and amplitude of first harmonic, judges that engine operation with the presence or absence of catching fire, avoids engine and associated components damage and deterioration of emission.
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:
Acquire the original tach signal of one working cycles of engine in real time by the crankshaft-signal sensor of engine；
The original tach signal of one working cycles of the engine is subjected to Fourier transformation, obtains first harmonic amplitude
With first harmonic phase；
Misfire determining is carried out using the first harmonic amplitude and the first harmonic phase as characteristic signal.
Further, misfire determining is carried out using the first harmonic amplitude and the first harmonic phase as characteristic signal
The step of, comprising:
The cylinder number that catches fire and catch fire is determined whether there is according to the first harmonic amplitude；
The cylinder number that catches fire is determined according to the first harmonic phase.
Further, the step for the cylinder number that catches fire and catch fire is determined whether there is according to the first harmonic amplitude, comprising:
Judge the first harmonic amplitude whether in preset threshold range；
If so, being judged to catching fire, and the cylinder number that catches fire is determined according to the preset threshold range；
If it is not, being then judged to not catching fire.
Further, the step of catching fire cylinder, is determined according to the first harmonic phase, comprising:
Preset phase list is inquired according to the first harmonic phase, catch fire cylinder number described in determination, the preset phase column
Table includes: first harmonic phase, catch fire cylinder number and the corresponding relationship that catches fire between cylinder number and three.
One kind being used for engine fire detection device, comprising:
First processing units, for acquiring one working cycles of engine in real time by the crankshaft-signal sensor of engine
Original tach signal；
The second processing unit, for the original tach signal of one working cycles of the engine to be carried out Fourier's change
It changes, obtains first harmonic amplitude and first harmonic phase；
Third processing unit, for being carried out using the first harmonic amplitude and the first harmonic phase as characteristic signal
Misfire determining.
Further, the third processing unit includes:
First determination unit, for determining whether there is the cylinder number that catches fire and catch fire according to the first harmonic amplitude；
Second determination unit, for determining the cylinder number that catches fire according to the first harmonic phase.
Further, first determination unit is used for:
Judge the first harmonic amplitude whether in preset threshold range；
If so, being judged to catching fire, and the cylinder number that catches fire is determined according to the preset threshold range；
If it is not, being then judged to not catching fire.
Further, second determination unit is used for:
Preset phase list is inquired according to the first harmonic phase, catch fire cylinder number described in determination, the preset phase column
Table includes: first harmonic phase, catch fire cylinder number and the corresponding relationship that catches fire between cylinder number and three.
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 are followed this method comprises: acquiring one work of engine in real time by the crankshaft-signal sensor of engine
The original tach signal of ring；The original tach signal of one working cycles of the engine is subjected to Fourier transformation, obtains one
Subharmonic amplitude and first harmonic phase；It is carried out using the first harmonic amplitude and the first harmonic phase as characteristic signal
Misfire determining.The present invention is analyzed by acquiring the original tach signal of engine in real time, by engine as an entirety, is led to
The phase and amplitude for crossing first harmonic judges engine operation with the presence or absence of catching fire, avoid engine and associated components damage and
Deterioration of emission.
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 embodiment flow chart of step S103 provided in an embodiment of the present invention；
Fig. 3 is the verification experimental verification result of first harmonic amplitude in engine fire provided in an embodiment of the present invention detection；
Fig. 4 is the verification experimental verification result of first harmonic phase in engine fire provided in an embodiment of the present invention detection；
Fig. 5 is provided in an embodiment of the present invention a kind of for engine fire structure of the detecting device schematic diagram.
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 is specifically included
Following steps:
S101, the original revolving speed letter for acquiring one working cycles of engine in real time by the crankshaft-signal sensor of engine
Number.
In the embodiment of the present invention, engine integral ought be analyzed, it is real by the crankshaft-signal sensor of engine
When acquire the original tach signal of engine, acquire the original tach signal an of working cycles.
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 one working cycles of the engine is subjected to Fourier transformation, obtained primary humorous
Wave amplitude and first harmonic phase.
In the embodiment of the present invention, by the way that the original tach signal of a working cycles is carried out Fourier transformation, one is obtained
Subharmonic amplitude and first harmonic phase.
S103, misfire determining is carried out using the first harmonic amplitude and the first harmonic phase as characteristic signal.
As shown in Fig. 2, a kind of specific implementation of step S103 provided in an embodiment of the present invention, specifically, will successively
The step of harmonic amplitude and first harmonic phase carry out misfire determining as characteristic signal, can specifically include following steps:
S201, the cylinder number that catches fire and catch fire is determined whether there is according to the first harmonic amplitude.
Specifically, determining whether there is the step for the cylinder number that catches fire and catch fire according to the first harmonic amplitude, comprising:
Judge the first harmonic amplitude whether in preset threshold range；
If so, being judged to catching fire, and the cylinder number that catches fire is determined according to the preset threshold range；
If it is not, being then judged to not catching fire.
It should be noted that as shown in figure 3, for by the verification experimental verification of first harmonic amplitude as a result, when not catching fire,
First harmonic phase-amplitude is smaller, and when catching fire, first harmonic amplitude becomes larger, and the cylinder number that catches fire is more, in identical operating condition
Under, amplitude variation is bigger.
S202, the cylinder number that catches fire is determined according to the first harmonic phase.
It catches fire when determining to exist, and after the determining cylinder number that catches fire, then the cylinder number that catches fire, tool is determined according to the first harmonic phase
Body, the step of catching fire cylinder, is determined according to the first harmonic phase, comprising:
Preset phase list is inquired according to the first harmonic phase, catch fire cylinder number described in determination, the preset phase column
Table includes: first harmonic phase, catch fire cylinder number and the corresponding relationship that catches fire between cylinder number and three.
It should be noted that as shown in figure 4, being the verification experimental verification by first harmonic phase as a result, under same operating
The cylinder number that catches fire is different, and first harmonic phase is different, can know the cylinder number that catches fire indirectly.
The embodiment of the invention provides one kind to be used for engine fire detection method, this method comprises: passing through engine
Crankshaft-signal sensor acquires the original tach signal of one working cycles of engine in real time；One work of the engine is followed
The original tach signal of ring carries out Fourier transformation, obtains first harmonic amplitude and first harmonic phase；By the first harmonic
Amplitude and the first harmonic phase are as characteristic signal progress misfire determining.The present invention by acquiring original turn of engine in real time
Fast signal analyzes engine as an entirety, by the phase and amplitude of first harmonic, judges that engine operation is
No presence is caught fire, and avoids engine and associated components damage and deterioration of emission.
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 figure 5, the embodiment of the invention provides one kind to be used for engine fire detection device, which is specifically wrapped
It includes: first processing units 501, the second processing unit 502 and third processing unit 503, in which:
First processing units 501, for acquiring one, engine work in real time by the crankshaft-signal sensor of engine
The original tach signal of circulation；
The second processing unit 502, for the original tach signal of one working cycles of the engine to be carried out Fourier
Transformation, obtains first harmonic amplitude and first harmonic phase；
Third processing unit 503, for using the first harmonic amplitude and the first harmonic phase as characteristic signal
Carry out misfire determining.
Further, the third processing unit 503 may include:
First determination unit 5031, for determining whether there is the cylinder that catches fire and catch fire according to the first harmonic amplitude
Number；
Second determination unit 5032, for determining the cylinder number that catches fire according to the first harmonic phase.
Further, first determination unit 501 is used for:
Judge the first harmonic amplitude whether in preset threshold range；
If so, being judged to catching fire, and the cylinder number that catches fire is determined according to the preset threshold range；
If it is not, being then judged to not catching fire.
Further, second determination unit 502 is used for:
Preset phase list is inquired according to the first harmonic phase, catch fire cylinder number described in determination, the preset phase column
Table includes: first harmonic phase, catch fire cylinder number and the corresponding relationship that catches fire between cylinder number and three.
The embodiment of the invention provides one kind to be used for engine fire detection device, and the present invention by acquiring engine in real time
Engine is analyzed as an entirety, by the phase and amplitude of first harmonic, judges engine by original tach signal
Operation avoids engine and associated components damage and deterioration of emission with the presence or absence of 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 (8)
1. one kind is used for engine fire detection method characterized by comprising
Acquire the original tach signal of one working cycles of engine in real time by the crankshaft-signal sensor of engine；
The original tach signal of one working cycles of the engine is subjected to Fourier transformation, obtains first harmonic amplitude and one
Subharmonic phase；
Misfire determining is carried out using the first harmonic amplitude and the first harmonic phase as characteristic signal.
2. the method according to claim 1, wherein by the first harmonic amplitude and the first harmonic phase
The step of carrying out misfire determining as characteristic signal, comprising:
The cylinder number that catches fire and catch fire is determined whether there is according to the first harmonic amplitude；
The cylinder number that catches fire is determined according to the first harmonic phase.
3. according to the method described in claim 2, catching fire it is characterized in that, being determined whether there is according to the first harmonic amplitude
And the step for the cylinder number that catches fire, comprising:
Judge the first harmonic amplitude whether in preset threshold range；
If so, being judged to catching fire, and the cylinder number that catches fire is determined according to the preset threshold range；
If it is not, being then judged to not catching fire.
4. according to the method described in claim 2, it is characterized in that, determining the step for the cylinder number that catches fire according to the first harmonic phase
Suddenly, comprising:
Preset phase list is inquired according to the first harmonic phase, catch fire cylinder number described in determination, the preset phase list packet
Include: first harmonic phase, catch fire cylinder number and the corresponding relationship that catches fire between cylinder number and three.
5. one kind is used for engine fire detection device characterized by comprising
First processing units acquire the original of one working cycles of engine for the crankshaft-signal sensor by engine in real time
Beginning tach signal；
The second processing unit is obtained for the original tach signal of one working cycles of the engine to be carried out Fourier transformation
To first harmonic amplitude and first harmonic phase；
Third processing unit, for catching fire using the first harmonic amplitude and the first harmonic phase as characteristic signal
Determine.
6. device according to claim 5, which is characterized in that the third processing unit includes:
First determination unit, for determining whether there is the cylinder number that catches fire and catch fire according to the first harmonic amplitude；
Second determination unit, for determining the cylinder number that catches fire according to the first harmonic phase.
7. device according to claim 6, which is characterized in that first determination unit is used for:
Judge the first harmonic amplitude whether in preset threshold range；
If so, being judged to catching fire, and the cylinder number that catches fire is determined according to the preset threshold range；
If it is not, being then judged to not catching fire.
8. device according to claim 6, which is characterized in that second determination unit is used for:
Preset phase list is inquired according to the first harmonic phase, catch fire cylinder number described in determination, the preset phase list packet
Include: first harmonic phase, catch fire cylinder number and the corresponding relationship that catches fire between cylinder number and three.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810686156.8A CN109030009A (en) | 2018-06-28 | 2018-06-28 | One kind being used for engine fire detection method and device |
| PCT/CN2018/120217 WO2020000913A1 (en) | 2018-06-28 | 2018-12-11 | Method and device for detecting engine misfire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810686156.8A CN109030009A (en) | 2018-06-28 | 2018-06-28 | One kind being used for engine fire detection method and device |
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| Publication Number | Publication Date |
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| CN109030009A true CN109030009A (en) | 2018-12-18 |
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| CN201810686156.8A Pending CN109030009A (en) | 2018-06-28 | 2018-06-28 | One kind being used for engine fire detection method and device |
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| CN (1) | CN109030009A (en) |
| WO (1) | WO2020000913A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021195948A1 (en) * | 2020-03-31 | 2021-10-07 | 潍柴动力股份有限公司 | Engine misfire detection method and apparatus, device, storage medium, and program |
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| WO2020000913A1 (en) | 2020-01-02 |
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Application publication date: 20181218 |