CN106884729B - Knock Signal Detection Method Based on Separation of Compression Pressure Change Rate - Google Patents
Knock Signal Detection Method Based on Separation of Compression Pressure Change Rate Download PDFInfo
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- CN106884729B CN106884729B CN201710169805.2A CN201710169805A CN106884729B CN 106884729 B CN106884729 B CN 106884729B CN 201710169805 A CN201710169805 A CN 201710169805A CN 106884729 B CN106884729 B CN 106884729B
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- 230000006835 compression Effects 0.000 title claims abstract description 83
- 238000007906 compression Methods 0.000 title claims abstract description 83
- 238000001514 detection method Methods 0.000 title claims abstract description 23
- 238000000926 separation method Methods 0.000 title claims abstract description 16
- 238000002485 combustion reaction Methods 0.000 claims abstract description 47
- 238000005474 detonation Methods 0.000 claims abstract description 39
- 238000000034 method Methods 0.000 claims abstract description 30
- 238000000354 decomposition reaction Methods 0.000 claims abstract description 7
- 238000002360 preparation method Methods 0.000 claims description 6
- 238000002474 experimental method Methods 0.000 claims description 3
- 241000208340 Araliaceae Species 0.000 claims 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 claims 1
- 235000003140 Panax quinquefolius Nutrition 0.000 claims 1
- 235000008434 ginseng Nutrition 0.000 claims 1
- TVMXDCGIABBOFY-UHFFFAOYSA-N octane Chemical compound CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 abstract description 8
- 239000000284 extract Substances 0.000 abstract description 7
- 238000012360 testing method Methods 0.000 description 3
- 238000012935 Averaging Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Engineering & Computer Science (AREA)
- Testing Of Engines (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
Abstract
The invention discloses a kind of methods of the detonation signal detection based on the separation of compression pressure change rate of octane motor, it is the compression pressure change rate signal and combustion pressure change rate signal by the gasoline engine in-cylinder pressure change rate signal decomposition of detonation sensor output at mixed gas, then the combustion pressure change rate signal obtained according to decomposition, further extracts detonation signal；Compression pressure change rate curve is obtained by two methods, and one is being fitted acquisition according to compression pressure change rate curve model, another method is that obtaining for corresponding pressure change rate curve is selected according to the operating temperature of engine and compression ratio；The advantage of the invention is that can judge the working condition of engine, detonation signal is accurately and effectively extracted.
Description
Technical field
The present invention relates to a kind of engine behavior signal detecting methods, are commented more particularly to a kind of using motor method
The method for determining octane number, the detonation signal detection technique field applied to octane motor.
Background technique
Motor method octane number tester is the knock intensity according to gasoline in combustor inner cylinder to evaluate gasoline octane
Value.In the prior art, the knock intensity of octane motor is generally by directly extraction in-cylinder pressure change rate signal
Peak value obtains.This method is simple and direct, is easily achieved, but there is problems in that
(1) since this method cannot judge whether engine occurs pinking, in spite of pinking has occurred, without exception simply
Use in-cylinder pressure change rate peak value as knock intensity index in ground；
(2) factors such as the vibration of engine, the opening and closing of inlet and exhaust valve, igniting of spark plug are easy to interfere pressure change rate peak
The detection of value generates error signal；
(3) knock index of existing method detection is inevitably influenced by compression pressure curve, is generated pinking and is referred to
Number test error, especially when using compression ratio method evaluation octane number, this error influences the evaluation result of octane number bright
It is aobvious.
Summary of the invention
In order to solve prior art problem, it is an object of the present invention to overcome the deficiencies of the prior art, and to provide one kind
The method of detonation signal detection based on the separation of compression pressure change rate, can judge the working condition of engine, accurately have
Effect ground extracts detonation signal, to improve the accuracy of detection detonation signal.
In order to achieve the above objectives, design of the invention is as follows:
In view of detonation sensor output pressure change rate signal be by mixed gas compression pressure change rate signal with
Made of combustion pressure change rate Signal averaging, and detonation signal is lain in combustion pressure change rate signal, therefore can be from
Compression pressure Signal separator is rejected in knock sensor output signal and goes out combustion pressure change rate signal, then analyzes combustion pressure change
Rate curve extracts more accurate knock index.
According to above-mentioned design, the present invention adopts the following technical scheme:
A method of the detonation signal detection based on the separation of compression pressure change rate detects gasoline using piezo-magnetic sensor
Machine in-cylinder pressure change rate signal, then by the gasoline engine in-cylinder pressure change rate signal decomposition of piezo-magnetic sensor output at mixing
The compression pressure change rate signal and combustion pressure change rate signal of gas are believed further according to obtained combustion pressure change rate is decomposed
Number draw combustion pressure change rate curve, then combustion pressure change rate curve is observed, further extract pinking letter
Number.
As a preferred technical solution of the invention, the compression pressure change rate curve preparation method are as follows: first
Compression pressure change rate curve model is derived by Thermodynamics Formulas, then according to the pressure change rate signal before igniting
Data acquire the value of the relevant parameter of compression pressure change rate curve model, fit specific compression pressure change rate curve.Make
For further preferred technical solution, derive that compression pressure change rate curve model is by Thermodynamics FormulasWherein θ is crank phase, n1、n2For the parameter of curve, then according to the pressure change rate before igniting
The data of signal acquire parameter of curve n1、n2Value, to fit compression pressure change rate curve.
As the preferred technical solution of another kind of the invention, the compression pressure change rate curve preparation method are as follows: first
It first passes through experiment to be tested, mainly under different engine operating temperatures and in different engine compression ratios, obtain
A series of compression pressure change rate curves under various operating conditions, obtain compression pressure change rate curve collection；Then according to engine
Actual operating temperature and compression ratio, to choose corresponding compression pressure change rate curve.As further preferred technology
Scheme, the engine operating temperature under different engine operating temperatures include the intake air temperature and Engine of Engine
Center housing temperature.As further preferred technical solution, under different engine operating temperatures, in different engine compression ratio feelings
Under condition, and under the conditions of the admission pressure of different engines, a series of compression pressure change rates obtained under various operating conditions are bent
Line obtains compression pressure change rate curve collection.It is measured when according to the race of engine as further preferred technical solution
Compression pressure change rate curve, compression pressure change rate curve are further corrected, and compact model is obtained.
As the further preferred technical solution of above scheme, in the combustion pressure change rate obtained by curve separating
In curve, the phase and size at the burning peak on change rate curve, judge that the working condition of engine is according to combustion pressure
It does not burn, normal combustion or pinking situation, when determining on combustion pressure change rate curve there are after detonation signal, then will be in quick-fried
Data value of the burning peak height or peak area of the combustion pressure change rate signal of shake state as detonation signal.
As the further preferred technical solution of above scheme, when observing combustion pressure change rate curve,
Judge whether the burning peak on combustion pressure change rate curve is located near zero point phase, that is, judges combustion pressure change rate curve
On burning peak whether be located at crankshaft reach top dead centre crank phase near, to obtain the working condition of engine.
The present invention compared with prior art, has following obvious prominent substantive distinguishing features and remarkable advantage:
1. the present invention can judge the working condition of engine, the influence factor of compression pressure is rejected, it is strong to improve pinking
Spend the evaluating precision of index；
2. the method implementation process for the detonation signal detection that the present invention separates is simple and easy, it is intuitive to obtain knock intensity index
Clearly.
Detailed description of the invention
Fig. 1 is the principle flow chart of the method for the isolated detonation signal detection of the embodiment of the present invention one.
Fig. 2 is the curve relation figure that the pressure change rate of the embodiment of the present invention one separates.
Fig. 3 is the combustion pressure rate of change curve chart of the embodiment of the present invention one.
Fig. 4 is the principle flow chart of the method for the isolated detonation signal detection of the embodiment of the present invention two.
Specific embodiment
Details are as follows for the preferred embodiment of the present invention:
Embodiment one:
In the present embodiment, referring to Fig. 1~3, a kind of side of the detonation signal detection based on the separation of compression pressure change rate
Method detects gasoline engine in-cylinder pressure change rate signal using piezo-magnetic sensor, the Engine for then exporting piezo-magnetic sensor
Interior pressure change rate signal decomposition at mixed gas compression pressure change rate signal and combustion pressure change rate signal, further according to
Decompose obtained combustion pressure change rate signal and draw combustion pressure change rate curve, then to combustion pressure change rate curve into
Row observation, further extracts detonation signal.
In the present embodiment, referring to Fig. 1 and Fig. 2, the compression pressure change rate curve preparation method are as follows: pass through heat first
Force equation derives that compression pressure change rate curve model, compression pressure change rate curve model areIts
Middle θ is crank phase, n1、n2Pressure is acquired then according to the data of the pressure change rate signal before igniting for the parameter of curve
The parameter of curve n of compression pressure change rate curve model1、n2Value, to fit specific compression pressure change rate curve.Such as
The curve b of Fig. 2 show compression pressure change rate curve.In Fig. 2, curve a is pressure change rate curve, and curve c is burning
Pressure change rate curve.Fig. 2 is the curve relation figure of pressure change rate separation, and abscissa is crank phase, and ordinate is voltage.
In the present embodiment, referring to Fig. 1 and Fig. 3, in the combustion pressure change rate curve obtained by curve separating,
When observing combustion pressure change rate curve, according to combustion pressure on change rate curve burning peak phase and size,
Judge engine working condition be do not burn, normal combustion or pinking situation, judge on combustion pressure change rate curve
Whether burning peak is located near zero point phase, that is, judges whether the burning peak on combustion pressure change rate curve is located at crankshaft arrival
Near the crank phase of top dead centre, when determining on combustion pressure change rate curve there are after detonation signal, then pinking shape will be in
Data value of burning the peak height Kn1 or peak area Kn2 of the combustion pressure change rate signal of state as detonation signal.Fig. 3 is burning
Pressure change rate curve graph, abscissa are crank phase, and ordinate is voltage.
In view of detonation sensor output pressure change rate signal be by mixed gas compression pressure change rate signal with
Made of combustion pressure change rate Signal averaging, and detonation signal is lain in combustion pressure change rate signal, and the present embodiment is
By the gasoline engine in-cylinder pressure change rate signal decomposition of detonation sensor output at the compression pressure change rate signal of mixed gas
With combustion pressure change rate signal, the combustion pressure change rate signal then obtained according to decomposition is further extracted more smart
True detonation signal.
Embodiment two:
The present embodiment is basically the same as the first embodiment, and is particular in that:
In the present embodiment, referring to fig. 4, the compression pressure change rate curve preparation method are as follows: first by test into
Row test, under different engine operating temperatures, in different engine compression ratios, and in the air inlet of different engines
Under pressure condition, a series of compression pressure change rate curves under various operating conditions are obtained, compression pressure change rate curve collection is obtained；
Then according to the actual operating temperature of engine and compression ratio, to choose corresponding compression pressure change rate curve.
In the present embodiment, referring to fig. 4, the engine operating temperature under different engine operating temperatures includes gasoline engine
The intake air temperature of cylinder and the center housing temperature of Engine.
The present embodiment establishes compression ratio, admission pressure, intake air temperature, the cylinder for considering engine cylinder by experimental method first
The compression pressure change rate model of the various operating condition factors of temperature；Then it according to the actual operating condition of engine, chooses corresponding
Compression pressure change rate curve.The present embodiment can judge the working condition of engine, accurately and effectively extract pinking letter
Number.
Embodiment three:
The present embodiment and embodiment two are essentially identical, are particular in that:
When in the present embodiment, according to the race of engine, i.e., when to engine not fuel feeding, the compression pressure measured changes
Rate curve, compression pressure change rate curve are further corrected, and compact model is obtained, and make compression pressure change rate curve collection more
Add the curve family for being integrated into compression pressure change rate curve more with realistic price, composition accurately compresses mould
Type.The present embodiment can judge the working condition of engine, more accurately and effectively extract detonation signal.
The embodiment of the present invention is illustrated above in conjunction with attached drawing, but the present invention is not limited to the above embodiments, it can be with
The purpose of innovation and creation according to the present invention makes a variety of variations, under the Spirit Essence and principle of all technical solutions according to the present invention
Change, modification, substitution, combination or the simplification made, should be equivalent substitute mode, as long as meeting goal of the invention of the invention,
Without departing from the technical principle and invention structure of the method for the detonation signal detection separated the present invention is based on compression pressure change rate
Think, belongs to protection scope of the present invention.
Claims (9)
1. a kind of method of the detonation signal detection based on the separation of compression pressure change rate, it is characterised in that: sensed using pressure magnetic
Device detects gasoline engine in-cylinder pressure change rate signal, the gasoline engine in-cylinder pressure change rate signal for then exporting piezo-magnetic sensor
The compression pressure change rate signal and combustion pressure change rate signal for resolving into mixed gas, the burning pressure obtained further according to decomposition
Power change rate signal draws combustion pressure change rate curve, then observes combustion pressure change rate curve, further mentions
Take out detonation signal.
2. the method for the detonation signal detection based on the separation of compression pressure change rate according to claim 1, which is characterized in that
The compression pressure change rate curve preparation method are as follows: compression pressure change rate curve mould is derived by Thermodynamics Formulas first
Type acquires the related ginseng of compression pressure change rate curve model then according to the data of the pressure change rate signal before igniting
Several values fits specific compression pressure change rate curve.
3. the method for the detonation signal detection based on the separation of compression pressure change rate according to claim 2, it is characterised in that:
Derive that compression pressure change rate curve model is by Thermodynamics FormulasWherein θ is crank phase, n1、
n2Parameter of curve n is acquired then according to the data of the pressure change rate signal before igniting for the parameter of curve1、n2Value, from
And fit compression pressure change rate curve.
4. the method for the detonation signal detection based on the separation of compression pressure change rate according to claim 1, which is characterized in that
The compression pressure change rate curve preparation method are as follows: tested first by experiment, mainly in different engine operation temperature
Degree is lower and in different engine compression ratios, obtains a series of compression pressure change rate curves under various operating conditions, obtains
Compression pressure change rate curve collection；Then according to the actual operating temperature of engine and compression ratio, to choose corresponding compression
Pressure change rate curve.
5. the method for the detonation signal detection based on the separation of compression pressure change rate according to claim 4, it is characterised in that:
Engine operating temperature under different engine operating temperatures includes the intake air temperature of Engine and the cylinder body of Engine
Temperature.
6. the method for the detonation signal detection based on the separation of compression pressure change rate according to claim 4, it is characterised in that:
Under different engine operating temperatures, in different engine compression ratios, and in the admission pressure item of different engines
Under part, a series of compression pressure change rate curves under various operating conditions are obtained, compression pressure change rate curve collection is obtained.
7. the method for the detonation signal detection based on the separation of compression pressure change rate according to claim 4, it is characterised in that:
When according to the race of engine, the compression pressure change rate curve measured, compression pressure change rate curve is further corrected, is obtained
To compact model.
8. the side of the detonation signal detection described according to claim 1~any one of 7 based on the separation of compression pressure change rate
Method, it is characterised in that: in the combustion pressure change rate curve obtained by curve separating, change rate curve according to combustion pressure
On burning peak phase and size, judge engine working condition be do not burn, normal combustion or pinking situation, when true
Determine on combustion pressure change rate curve there are after detonation signal, then will be in the combustion of the combustion pressure change rate signal of knocking state
Burn the data value of peak height or peak area as detonation signal.
9. the side of the detonation signal detection described according to claim 1~any one of 7 based on the separation of compression pressure change rate
Method, it is characterised in that: when observing combustion pressure change rate curve, judge the burning on combustion pressure change rate curve
Whether peak is located near zero point phase, that is, judges whether the burning peak on combustion pressure change rate curve is located at crankshaft and reaches only
Near the crank phase of point, to obtain the working condition of engine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710169805.2A CN106884729B (en) | 2017-03-21 | 2017-03-21 | Knock Signal Detection Method Based on Separation of Compression Pressure Change Rate |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710169805.2A CN106884729B (en) | 2017-03-21 | 2017-03-21 | Knock Signal Detection Method Based on Separation of Compression Pressure Change Rate |
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| CN106884729A CN106884729A (en) | 2017-06-23 |
| CN106884729B true CN106884729B (en) | 2019-06-04 |
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| CN201710169805.2A Expired - Fee Related CN106884729B (en) | 2017-03-21 | 2017-03-21 | Knock Signal Detection Method Based on Separation of Compression Pressure Change Rate |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6580174B2 (en) * | 2018-02-23 | 2019-09-25 | 三菱電機株式会社 | Control device and control method for internal combustion engine |
| CN114608830B (en) * | 2022-02-10 | 2023-03-17 | 南京航空航天大学 | A Doe-based Knock Suppression Method for Two-stroke Ignition Aviation Kerosene Engine |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61245039A (en) * | 1985-04-22 | 1986-10-31 | Nissan Motor Co Ltd | Knocking detecting device for internal combustion engine |
| CN101189499A (en) * | 2005-04-27 | 2008-05-28 | 丰田自动车株式会社 | Internal combustion engine knock determination equipment |
| CN102735395A (en) * | 2012-06-21 | 2012-10-17 | 天津大学 | On-line diagnosis and control method for knockings of internal-combustion engine |
| CN104533616A (en) * | 2013-08-15 | 2015-04-22 | 罗伯特·博世有限公司 | Method and device for knocking identification of internal combustion engine |
| WO2016168940A1 (en) * | 2015-04-23 | 2016-10-27 | Westport Power Inc. | Detecting and mitigating abnormal combustion characteristics |
-
2017
- 2017-03-21 CN CN201710169805.2A patent/CN106884729B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61245039A (en) * | 1985-04-22 | 1986-10-31 | Nissan Motor Co Ltd | Knocking detecting device for internal combustion engine |
| CN101189499A (en) * | 2005-04-27 | 2008-05-28 | 丰田自动车株式会社 | Internal combustion engine knock determination equipment |
| CN102735395A (en) * | 2012-06-21 | 2012-10-17 | 天津大学 | On-line diagnosis and control method for knockings of internal-combustion engine |
| CN104533616A (en) * | 2013-08-15 | 2015-04-22 | 罗伯特·博世有限公司 | Method and device for knocking identification of internal combustion engine |
| WO2016168940A1 (en) * | 2015-04-23 | 2016-10-27 | Westport Power Inc. | Detecting and mitigating abnormal combustion characteristics |
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Granted publication date: 20190604 |