CN102735395A - On-line diagnosis and control method for knockings of internal-combustion engine - Google Patents
On-line diagnosis and control method for knockings of internal-combustion engine Download PDFInfo
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- CN102735395A CN102735395A CN2012102078514A CN201210207851A CN102735395A CN 102735395 A CN102735395 A CN 102735395A CN 2012102078514 A CN2012102078514 A CN 2012102078514A CN 201210207851 A CN201210207851 A CN 201210207851A CN 102735395 A CN102735395 A CN 102735395A
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Abstract
The invention belongs to the technical field of an internal-combustion engine and relates to an on-line diagnosis and control method for knockings of the internal-combustion engine. The on-line diagnosis and control method comprises the following steps: utilizing a sensor for a pressure in a cylinder and a photoelectric encoder to synchronously determine a crank angle signal of the pressure in the cylinder of an engine; analyzing by introducing the determined signal into an on-line diagnostic processor for the knockings of the engine; adjusting a work load of the engine, so as to cause the engine to work in a low-speed heavy-load work area in which the knockings are easy to generate; on-line comparing an analysis result of the processor and judging whether a pressure peak under each crank angle, a rise rate of the pressure in the cylinder, an oscillating feature of the pressure in the cylinder and a frequency feature of a knocking center exceed respective preset knocking threshold values or not; confirming whether the engine is subjected to knockings or not according to a final diagnosis result; and if the engine is subjected to knockings, timely adjusting the parameters of angular advance for engine ignition, air-fuel ratio, and the like, through EGU, and performing feedback control till the knockings are eliminated. According to the on-line diagnosis and control method for the knockings of the internal-combustion engine, the problem of the knockings of the modern internal-combustion engine is effectively identified and restrained under the conditions of promoted fuel economy and reduced low-emission of the internal-combustion engine.
Description
Affiliated technical field
The present invention relates to a kind of engine knocking in I. C. engine inline diagnosis and control method, particularly relate to miniaturization gasoline engine knock diagnostic and control method.
Background technology
In field of internal combustion engine, engine is to lean against Piston Compression to light the combustion mixture of HTHP near near the time top dead centre, the heat energy dress that burning is produced turns to kinetic energy, externally output power and moment of torsion.But, (, electronic spark advance etc. too high) in some cases such as ratio of compression, pinking or engine knock phenomenon can appear in engine.Pinking is high-frequency pressure fluctuation phenomenon to occur in a kind of firing chamber that is caused by abnormal burning; Be that normal flame is in the firing chamber forward in the progradation; Be in the locational that part of unburned mixture of final combustion and under the effect of HTHP, accelerate reaction in advance, so that one or several spontaneous combustion centers appear in the inside of unburned mixture before normal flame does not arrive.The self-ignition light forward outwards propagates with high speed, and the combustion mixture that burnt rapidly produces shock wave simultaneously and in cylinder, propagates back and forth, causes strong high-frequency pressure vibration.During light knock, engine capacity slightly increases; During severe knock, engine capacity descends, and body is overheated, even can cause firing chamber annex and body to damage.Simultaneously, in order to realize the purpose of energy-saving and emission-reduction, Modern Internal-Combustion Engine is gradually to the trend toward miniaturization development, corresponding with it is exactly internal combustion engine high pressure contracts than with the high pressure-charging development of technology, yet these measures have all directly increased the tendency of engine generation pinking.Therefore, the engine knocking in I. C. engine inline diagnosis suppresses pinking for increasing substantially the internal combustion engine power per liter and is of great immediate significance with control.
The engine knocking in I. C. engine diagnostic method generally is divided into direct method and indirect method.Traditional knock diagnostic and control method are discerned pinking through measuring body vibration, internal combustion engine noise and in-cylinder pressure peak value often, have caused the distortion of signal to a certain extent.At first; Vibration transducer or detonation sensor are set on engine body; Body vibration intensity through the in-cylinder pressure vibration causes is judged pinking; But the shortcoming of this method is the direct influence that body vibration also receives the other systems such as mechanical drive of vehicle, and resulting signal can not directly reflect pinking information, especially shows on the multicylinder engine; Secondly, discern pinking through the sound pressure level size of measuring engine noise and also exist the interference of mechanical noise to combustion noise, signal to noise ratio (S/N ratio) is relatively poor; Moreover; For the in-cylinder pressure signal directly related with pinking; Classic method only is to measure single in-cylinder pressure peak value through in-cylinder pressure sensor to discern pinking; Caused in a sense the erroneous judgement of phenomenon of detonation and caused the reduction of engine thermal efficiency, practicality relatively poor [1-3].
Pertinent literature
[1]C.Hudsona,X.Gaoa,R.Stone.(2001)Knock?measurement?for?fuel?evaluation?in?spark?ignition?engines,Fuel,80,pp395407.
[2]Mark?Urlaub?and?Johann?F.B¨ohme.Reconstruction?of?pressure?signals?on?structure-borne?sound.SAE?Paper?2004010521.
for?knock?investigation
[3]Wei?Haiqiao,Wei?Jingsi,Shu?Gequn.(2011)‘Calculation?on?Cylinder?Pressure?Fluctuation?by?Using?the?Wave?Equation’,Chinese?journal?of?mechanical?engineering,Vol.24,NO.5,pp.19.
Summary of the invention
The objective of the invention is to overcome in the prior art and can't accurately discern the defective that pinking takes place through indirect measurement method (vibration, noise signal) and single pressure signal; A kind of engine knocking in I. C. engine inline diagnosis and control method are proposed; In-cylinder pressure through adopting the burning of direct reflection combustion knock and wave characteristic thereof and frequency characteristic are come inline diagnosis and controlling combustion engine pinking; Miniaturization gasoline engine phenomenon of detonation particularly; Thereby can under the prerequisite that improves fuel economy, the low emission of reduction internal combustion engine, discern and suppress Modern Internal-Combustion Engine pinking problem, the development of promotion internal combustion engine industry effectively.Technical scheme of the present invention is following:
A kind of engine knocking in I. C. engine inline diagnosis and control method comprise the following steps:
(1) starting engine makes each circulation system get into normal operating conditions;
(2) utilize in-cylinder pressure sensor and photoelectric encoder to measure engine cylinder internal pressure p crank angle
signal synchronously, and with analyzing in the measured signal importing combustion knock inline diagnosis processor;
(3) adjustment engine operation load makes it be operated in the big load operation of the low speed that is easy to generate pinking zone;
(4) the pressure peak p under online each crank angle of comparator processor analysis result
Max, the in-cylinder pressure rate of rise
The in-cylinder pressure oscillation characteristics
And pinking centre frequency characteristic f
The centerWhether surpassed preset separately pinking threshold value;
(5) come identification of Engine whether pinking takes place according to the diagnosis net result, and if pinking had taken place in time through parameter FEEDBACK CONTROL such as EGU adjustment advance angle of engine ignition and air-fuel ratios until the elimination pinking.
The present invention has the following advantages: at first the present invention discerns phenomenon of detonation according to the in-cylinder pressure signal that directly reflects detonating combustion in the engine working process, thereby has avoided because the problem of the detonation signal distortion that the interference of extraneous factors such as the vibration of other annexes, mechanical noise causes; Secondly, to the randomness and the complicacy of engine knocking in I. C. engine phenomenon, the present invention carries out Treatment Analysis to engine cylinder internal pressure signal and fluctuation characteristic thereof, thereby has avoided simple dependence in-cylinder pressure peak value to discern the erroneous judgement that the pinking generation is brought.At last, the present invention has also considered firing chamber cavity resonance characteristic, obtains the pinking centre frequency according to the frequency characteristic of engine pressure fluctuation and confirms finally whether pinking the ignorance of in-cylinder pressure frequency characteristic when having overcome for a long time to pinking thus takes place.
Description of drawings
Fig. 1 is pinking identification according to an embodiment of the invention and control flow chart;
Fig. 2 is reception and the processing procedure synoptic diagram of combustion knock inline diagnosis processor to the pressure crankshaft signal;
Fig. 3 representes that cycle internal combustion of engine burns chamber in-cylinder pressure signal schematic representation;
Fig. 4 representes combustion knock in-cylinder pressure oscillating characteristic synoptic diagram;
The spectral characteristic synoptic diagram that the oscillation pressure spectrum analysis obtained in the cylinder when Fig. 5 represented combustion knock.
Embodiment
Referring to Fig. 1 and Fig. 2, engine knocking in I. C. engine inline diagnosis of the present invention and control method mainly comprise the following steps: starting engine, and engine is carried out preheating in 20 minutes, guarantee that each circulation system gets into normal operating conditions; Utilize in-cylinder pressure sensor and photoelectric encoder to measure engine cylinder internal pressure p crank angle synchronously
Signal, and with analyzing in the measured signal importing combustion knock inline diagnosis processor; The load of adjustment engine operation makes it be operated in the big load operation of the low speed that is easy to generate pinking zone; Pressure peak p under online each crank angle of comparator processor analysis result
Max, the in-cylinder pressure rate of rise
The in-cylinder pressure oscillation characteristics
And pinking centre frequency characteristic f
The centerWhether surpassed the predetermined pinking threshold value of processor; Come identification of Engine whether pinking takes place according to the diagnosis net result, if pinking has taken place then in time adjust parameters such as advance angle of engine ignition and air-fuel ratio and eliminate pinking.
Need to prove that engine cylinder internal pressure information spinner will comprise the pressure peak p under each crank angle
Max, the in-cylinder pressure rate of rise
The in-cylinder pressure oscillation characteristics
And pinking centre frequency characteristic f
The centerFirst parameter has reflected engine working area, and middle two parameters have directly reflected the generation and the intensity thereof of combustion knock, and they can be considered the pressure characteristic value; And last reflection pressure oscillation frequency characteristic; Be regarded as the frequecy characteristic value; Also promptly for given engine; The pairing frequency of maximum amplitude after under the prerequisite of considering the firing chamber cavity resonance engine oscillation pressure and crank angle corresponding relation being carried out spectrum analysis, for representative engine, the pinking centre frequency is generally in 612KHz.
We know, observe combustion process of the internal-combustion engine from macroscopic view, and cylinder pressure changes on the yardstick suitable with the time scale of the cycle period of engine in the time.And the cylinder pressure fluctuation mainly occurs near the piston top dead center, and the yardstick that cylinder pressure changes has instantaneity.Therefore; Can adopt two kinds of time scales to represent the Changing Pattern of cylinder pressure: to use the big time scale suitable to describe the macrofeature that cylinder pressure changes, use the little time scale suitable to describe the microscopic feature of cylinder pressure fluctuation with the instantaneity of burning with cycle period.Can cylinder pressure p be decomposed into equal value part and undulating quantity part, promptly
Wherein
representes the equal value part of cylinder pressure; Do not comprise the pressure surge value; Reflect the macrofeature that the cylinder pressure of big time scale changes, be equivalent to change with working cycle, removed the cylinder pressure smooth curve of sawtooth fluctuation; Pressure surge value P ' then representes to be superimposed upon the undulating quantity on this mean value, has reflected the microscopic feature of little time scale cylinder pressure fluctuation.According to this thinking; We can with synchro measure to the in-cylinder pressure crankshaft signal handle, be about to the two-part stack of fluctuation pressure of oscillation pressure in equal duty pressure that the instantaneous in-cylinder pressure signal of engine is understood as reflection engine mean indicated pressure (MIP) and the expression cylinder.Judge engine perform region of living in this moment according to pressure average pressure portion (like maximum pressure in the cylinder), diagnose engine whether pinking and intensity thereof take place according to engine cylinder internal pressure pulsation part (like the rate of pressure rise, pressure oscillation characteristic etc.).
Below in conjunction with embodiment the present invention is further specified:
(1) starting engine at first need guarantee more than 20 minutes that engine fuel system, cooling system get into normal duty with engine prewarming generally speaking;
(2) in order to obtain the instantaneous in-cylinder pressure signal of engine, need utilize in-cylinder pressure sensor, photoelectric encoder, wave filter, signal sampler and processor to be equal to pacing amount in-cylinder pressure and corner signal.Because these technological means are very familiar for the common engine technician, exceed so its description is only limited to clearly describe practical implementation of the present invention.Then with synchro measure to instantaneous in-cylinder pressure corner signal import in the combustion knock inline diagnosis processor and carry out analyzing and processing, fluctuation pressure two parts of oscillation pressure in the equal duty pressure that engine instantaneous pressure signal discrete is decomposed into expression circulation mean indicated pressure (MIP) and the expression cylinder.The situation of in-cylinder pressure higher-order of oscillation when in-cylinder pressure situation of change and pinking when Fig. 3 and Fig. 4 have shown the engine operation respectively.Fig. 5 spectral characteristic synoptic diagram that the oscillation pressure spectrum analysis obtains in the cylinder for to combustion knock the time.Here so-called pressure oscillation is meant that piston runs to about top dead centre, the deviate that produces between instantaneous in-cylinder pressure curve during engine generation pinking and the average pressure curve (maybe for+, maybe for-).
(3) the engine knocking in I. C. engine combustion phenomena takes place under the big load condition of low speed the most easily, therefore, needs the adjustment engine load that engine working area is transferred to the low speed high load working condition.Under laboratory condition, engine load adjustment can realize through the electric dynamometer that connects with engine; And for car load, be appreciated that at vehicle body to load the transfer that realizes engine working area.
(4) in the process of regulating, online at any time comparator processor analysis result p
Max,
And pinking centre frequency f
The centerWhether surpassed the predetermined pinking threshold value of processor.This part is a key component of the present invention.The knock diagnostic processor is at first handled filtered engine cylinder internal pressure crankshaft signal, obtains in-cylinder pressure p
MaxAnd oscillator signal
And with these analysis results and combustion knock threshold ratio, the amount that exceeds the pinking threshold value according to the maximal value of these signals is come preliminary generation and the intensity thereof of confirming pinking.If confirm that tentatively pinking takes place; Then under the prerequisite of having considered firing chamber cavity resonance characteristic; Whether the pressure oscillation centre frequency of confirming this moment according to the engine pressure frequency characteristic is within the pinking centre frequency scope, and judges finally whether pinking takes place.It should be noted that the pinking threshold value here is to obtain possibly take place under the various operating modes critical range of detonating combustion through a large amount of engine calibration experiments, if surpass the danger that this threshold value just means very possible generation pinking.
(5) last, according to the generation of result identification and control pinking.If the pressure characteristic value of engine output surpasses the pinking threshold value; Then continue the comparison frequency eigenwert and whether surpass predetermined value; If the latter also exceeds critical range; Can confirm that then pinking takes place, constantly or reduce parameter such as air-fuel ratio and disappear immediately until pinking through the continuous late ignition of ECU ECU; Otherwise, carry out next round-robin knock diagnostic identification work.Need to prove; Because sometimes even engine cylinder internal pressure oscillation amplitude is very big; But the frequecy characteristic value is not within the detonation frequency interval; Can not judge whether pinking really takes place,, judge the appearance of pinking so will consider pressure characteristic value and frequecy characteristic value simultaneously because exist firing chamber cavity resonance phenomenon.
Claims (1)
1. engine knocking in I. C. engine inline diagnosis and control method comprise the following steps:
(1) starting engine makes each circulation system get into normal operating conditions;
(2) utilize in-cylinder pressure sensor and photoelectric encoder to measure engine cylinder internal pressure p-crank angle
signal synchronously, and with analyzing in the measured signal importing combustion knock inline diagnosis processor;
(3) adjustment engine operation load makes it be operated in the big load operation of the low speed that is easy to generate pinking zone;
(4) the pressure peak p under online each crank angle of comparator processor analysis result
Max, the in-cylinder pressure rate of rise
The in-cylinder pressure oscillation characteristics
And pinking centre frequency characteristic f
The centerWhether surpassed preset separately pinking threshold value;
(5) come identification of Engine whether pinking takes place according to the diagnosis net result, and if pinking had taken place in time through parameter FEEDBACK CONTROL such as EGU adjustment advance angle of engine ignition and air-fuel ratios until the elimination pinking.
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Cited By (15)
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| CN103147868A (en) * | 2013-03-07 | 2013-06-12 | 天津大学 | Cavity resonance-based control method for reducing combustion noises of combustion engines |
| CN103967637A (en) * | 2014-04-20 | 2014-08-06 | 中国北车集团大连机车车辆有限公司 | Correcting method of crank angle value of combustion cylinder pressure testing curve of reciprocating 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 |
| CN104763532A (en) * | 2013-10-29 | 2015-07-08 | 罗伯特·博世有限公司 | Method and apparatus for recognizing knocking of an internal combustion engine, preferably of a gasoline engine |
| CN105899792A (en) * | 2014-01-10 | 2016-08-24 | 三菱重工业株式会社 | Knocking determination device and knocking control device for internal combustion engine |
| CN106884729A (en) * | 2017-03-21 | 2017-06-23 | 上海大学 | The method of the detonation signal detection for based on compression pressure rate of change separate |
| CN106917695A (en) * | 2015-12-24 | 2017-07-04 | 马自达汽车株式会社 | The fuel injection control device and device of compression self-ignition engine |
| CN106917694A (en) * | 2015-12-24 | 2017-07-04 | 马自达汽车株式会社 | The fuel injection control device and device of compression self-ignition engine |
| CN106917693A (en) * | 2015-12-24 | 2017-07-04 | 马自达汽车株式会社 | The fuel injection control device and device of compression self-ignition engine |
| WO2017202263A1 (en) * | 2016-05-23 | 2017-11-30 | 上海海事大学 | Method for performing angle encoding on instantaneous pressure in cylinder of engine |
| CN108474317A (en) * | 2016-01-22 | 2018-08-31 | 三菱重工业株式会社 | Method for knock detection, ignition timing control method and ITCS Ignition Timing Control System |
| CN109488473A (en) * | 2018-12-17 | 2019-03-19 | 中国船舶重工集团公司第七研究所 | The online anticipation system of engine and online pre-judging method |
| CN110185569A (en) * | 2018-02-23 | 2019-08-30 | 三菱电机株式会社 | The control device and control method of internal combustion engine |
| KR20200004347A (en) * | 2017-05-05 | 2020-01-13 | 우드워드, 인크. | Double fuel combustion intensity |
| CN112483271A (en) * | 2020-11-18 | 2021-03-12 | 中车工业研究院有限公司 | Engine and control method thereof |
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| CN103147868A (en) * | 2013-03-07 | 2013-06-12 | 天津大学 | Cavity resonance-based control method for reducing combustion noises of combustion engines |
| CN104533616B (en) * | 2013-08-15 | 2018-12-14 | 罗伯特·博世有限公司 | The method and apparatus that pinking for internal combustion engine identifies |
| 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 |
| CN104763532A (en) * | 2013-10-29 | 2015-07-08 | 罗伯特·博世有限公司 | Method and apparatus for recognizing knocking of an internal combustion engine, preferably of a gasoline engine |
| CN104763532B (en) * | 2013-10-29 | 2019-02-26 | 罗伯特·博世有限公司 | The method and apparatus of internal combustion engine, preferably petrol engine pinking for identification |
| CN105899792A (en) * | 2014-01-10 | 2016-08-24 | 三菱重工业株式会社 | Knocking determination device and knocking control device for internal combustion engine |
| CN105899792B (en) * | 2014-01-10 | 2019-04-26 | 三菱重工业株式会社 | The knock determination and knock control apparatus of internal combustion engine |
| CN103967637A (en) * | 2014-04-20 | 2014-08-06 | 中国北车集团大连机车车辆有限公司 | Correcting method of crank angle value of combustion cylinder pressure testing curve of reciprocating engine |
| CN106917695A (en) * | 2015-12-24 | 2017-07-04 | 马自达汽车株式会社 | The fuel injection control device and device of compression self-ignition engine |
| CN106917694B (en) * | 2015-12-24 | 2020-04-14 | 马自达汽车株式会社 | Fuel injection control method and device for compression self-ignition engine |
| CN106917693A (en) * | 2015-12-24 | 2017-07-04 | 马自达汽车株式会社 | The fuel injection control device and device of compression self-ignition engine |
| CN106917694A (en) * | 2015-12-24 | 2017-07-04 | 马自达汽车株式会社 | The fuel injection control device and device of compression self-ignition engine |
| CN106917695B (en) * | 2015-12-24 | 2020-09-29 | 马自达汽车株式会社 | Fuel injection control method and device for compression self-ignition engine |
| CN106917693B (en) * | 2015-12-24 | 2020-04-14 | 马自达汽车株式会社 | Fuel injection control method and device for compression self-ignition engine |
| CN108474317A (en) * | 2016-01-22 | 2018-08-31 | 三菱重工业株式会社 | Method for knock detection, ignition timing control method and ITCS Ignition Timing Control System |
| WO2017202263A1 (en) * | 2016-05-23 | 2017-11-30 | 上海海事大学 | Method for performing angle encoding on instantaneous pressure in cylinder of engine |
| CN106884729A (en) * | 2017-03-21 | 2017-06-23 | 上海大学 | The method of the detonation signal detection for based on compression pressure rate of change separate |
| CN106884729B (en) * | 2017-03-21 | 2019-06-04 | 上海大学 | The method of detonation signal detection based on the separation of compression pressure change rate |
| KR20200004347A (en) * | 2017-05-05 | 2020-01-13 | 우드워드, 인크. | Double fuel combustion intensity |
| CN110869596A (en) * | 2017-05-05 | 2020-03-06 | 伍德沃德有限公司 | Dual fuel combustion intensity |
| KR102494233B1 (en) | 2017-05-05 | 2023-02-01 | 우드워드, 인크. | dual fuel burning intensity |
| CN110869596B (en) * | 2017-05-05 | 2023-06-13 | 伍德沃德有限公司 | Dual fuel combustion intensity |
| CN110185569A (en) * | 2018-02-23 | 2019-08-30 | 三菱电机株式会社 | The control device and control method of internal combustion engine |
| CN109488473A (en) * | 2018-12-17 | 2019-03-19 | 中国船舶重工集团公司第七研究所 | The online anticipation system of engine and online pre-judging method |
| CN109488473B (en) * | 2018-12-17 | 2021-08-13 | 中国船舶重工集团公司第七一一研究所 | Online prejudgment system and online prejudgment method of engine |
| CN112483271A (en) * | 2020-11-18 | 2021-03-12 | 中车工业研究院有限公司 | Engine and control method thereof |
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Application publication date: 20121017 |