CN102817738B - A kind of hcci engine Detection & Controling method of catching fire - Google Patents
A kind of hcci engine Detection & Controling method of catching fire Download PDFInfo
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- CN102817738B CN102817738B CN201210316085.5A CN201210316085A CN102817738B CN 102817738 B CN102817738 B CN 102817738B CN 201210316085 A CN201210316085 A CN 201210316085A CN 102817738 B CN102817738 B CN 102817738B
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Abstract
A kind of hcci engine Detection & Controling method of catching fire, it is Real-time Collection corner signal and cylinder pressure signal the pressure observation window that comprises compression top center is set in each working cycles of hcci engine, the terminal of pressure observation window by cylinder pressure signal the integrated value in pressure observation window compare with the pressure threshold that catches fire, when this integrated value is less than or equal to while catching fire pressure threshold, ECU sends repairing signal and ignition signal to fuel injector and ignition coil successively, in expansion stroke, the gaseous mixture catching fire in cylinder is lighted. It is simple and reliable that the present invention has control method, and control accuracy advantages of higher can effectively reduce fluctuation between hcci engine circulation, improve little load combustion stability, expand the range of operation of HCCI combustion system, improve fuel economy, reduce the HC discharge causing owing to catching fire.
Description
Technical field
The present invention relates to a kind of method of the combustion position of Incylinder direct injection Gasoline HCCI being carried out to Detection & Controling, belong to technical field of engines.
Background technology
In order to tackle energy-conservation and severe challenge environmental protection, international internal combustion engine circle has extensively been carried out the research of the new combustion technology of internal combustion engine, wherein homogeneous charging compression and combustion technology (HCCI), with its outstanding fuel saving and low emission performance, becomes one of study hotspot. But HCCI burning is controlled by Chemical Kinetics, and temperature, concentration and group grading factors to gaseous mixture are very responsive. Especially under little load condition, the heat that unit cycle fluid produces is less, make the interior hot atmosphere of engine cylinder poor, some circulations phenomenon of can catching fire, cause higher not combustion HC discharge, catching fire of indivedual circulations can even directly cause engine misses, therefore in the control procedure of hcci engine, must ensure as far as possible that each circulation do not catch fire. But mostly the control strategy that at present engine adopts, be to take the control device based on operating mode, be converted into different operating modes and carry out control engine by driver-commanded. In this control system, its information feedback element major part completes by calibration process, only has the macroscopic view effect in statistical significance, can not control in real time the transient condition of engine, thereby cannot avoid indivedual circulations to catch fire.
It is the important prerequisite of control engine fired state to the reliable detection of engine fire, someone adopts engine speed or gas current as the basis for estimation of the state of catching fire at present, when but employing engine speed is caught fire, the method for judgement is travelled on the transient conditions such as automobile acceleration and deceleration or the road surface of jolting, easily loses efficacy; Catch fire while judgement and adopt ion current signal to carry out hcci engine, during due to little load, HCCI gaseous mixture is rarer, and ion current signal is faint, poor signal to noise, and signal characteristic abstraction difficulty, is difficult to realize commercial application.
Summary of the invention
The object of the present invention is to provide a kind of hcci engine Detection & Controling method of catching fire, to reduce the exhaust emissions of engine and to guarantee hcci engine stable operation under little load condition.
The alleged problem of the present invention realizes with following technical proposals:
A kind of hcci engine Detection & Controling method of catching fire, described method is Real-time Collection corner signal and cylinder pressure signal the pressure observation window that comprises compression top center is set in each working cycles of hcci engine, the terminal of pressure observation window by cylinder pressure signal the integrated value in pressure observation window compare with the pressure threshold that catches fire, when this integrated value is less than or equal to while catching fire pressure threshold, ECU sends repairing signal and ignition signal to fuel injector and ignition coil successively, in expansion stroke, the gaseous mixture catching fire in cylinder is lighted.
The above-mentioned hcci engine Detection & Controling method of catching fire, the initial point of described pressure observation window is arranged on front 29～31 ° of CA of compression top center, and the terminal of pressure observation window is arranged on 19～21 ° of CA after compression top center.
The above-mentioned hcci engine Detection & Controling method of catching fire, the repairing moment of fuel injector is 2 ° of CA after pressure observation window terminal; The time of ignition of ignition coil is 5 ° of CA after repairing finish time of fuel injector.
The above-mentioned hcci engine Detection & Controling method of catching fire, described in the pressure threshold that catches fire demarcate by test.
The present invention is taking the burn cycle of engine as controlling unit, basis for estimation using cylinder pressure as the state of catching fire, eliminate engine fire phenomenon by repairing and ignition way, there is control method simple and reliable, control accuracy advantages of higher, described method can effectively reduce fluctuation between hcci engine circulation, improve little load combustion stability, expand the range of operation of HCCI combustion system, improve fuel economy, reduce the HC discharge causing owing to catching fire.
Brief description of the drawings
Below in conjunction with accompanying drawing, the invention will be further described.
Fig. 1 is control strategy schematic diagram of the present invention.
Detailed description of the invention
The technical program is for Incylinder direct injection Gasoline HCCI, taking engine combustion cycle as controlling unit, near, the observation window of cylinder pressure signal is set according to engine operating condition and bent axle code device signal (corner signal). Because engine normal combustion generally occurs near, make the part cylinder that can explain combustion phenomena press signal also substantially to appear near top dead centre. While pressing signal to carry out FEEDBACK CONTROL based on cylinder, only need to carry out Treatment Analysis to obtain the combustion information in cylinder to the signal near window area top dead centre. According to the feature of HCCI burning, its burning velocity is very fast, generally continues several or tens crank angles. Between window region, choose according to test experience to 20 ° of CA of after top dead center from 30 ° of CA of before upper dead canter, can meet the needs of combustion phenomena observation and subsequent control. In the time of the little load combustion boundary operation of hcci engine, adopt cycle analysis means, the real-time monitored that circulates one by one cylinder pressure signal. In the time that current circulation observation finishes, the integrated value according to cylinder pressure signal in observation window is formulated the evaluation algorithm of catching fire, and control system is thought and while having there is to catch fire phenomenon in cylinder, set the mark that catches fire. Control system according to catch fire mark utilize direct fuel-injection engine flexibly injection characteristics send repairing amount, repairing moment and time of ignition instruction. Carrying out a small amount of oil spout in the repairing moment, light a fire at time of ignition, realize HCCI after-burning, eliminate the phenomenon of catching fire, improve hot atmosphere in cylinder, is next circulation gaseous mixture HCCI burning preparatory condition; Meanwhile, the after-burning before opening by current circulating exhaust door reduces not fire HC concentration, reduces the HC discharge in tail gas.
The detailed description of technical solution of the present invention:
1, the technical program relates to the means that adopt cycle analysis, cyclically HCCI combustion position is analyzed one by one. Gather cylinder pressure signal by cylinder pressure sensor, the pressure integrated value in extraction near one pressure observation window is as cylinder pressure characteristics value, as the basis for estimation of fired state.
2, pressure observation window is Shiftable window, and pressure observation window initial point is in the 30 ° of CA left and right of before upper dead canter that catch fire, and pressure observation window terminal is 20 ° of CA left and right after compression top center. The angle value of concrete initial point and terminal is obtained by bent axle encoder to count, relevant with the operating condition of engine, needs to carry out determining after statistical analysis according to the demarcation situation of a large amount of combustion experiment data.
3, in circulation of engine, from exhaust top dead center, ECU ECU starts to detect the output signal of cylinder pressure sensors. From pressure observation window initial point, the output signal of cylinder pressure sensors is input to cylinder pressure signal integration module and carries out in real time integral operation, until pressure observation window finish time. After calculating finishes, cylinder pressure signal integrated value input ECU.
4, the evaluation algorithm of catching fire is as follows: according to the pressure threshold that catches fire setting in advance to engine certain circulation whether catch fire and judge. In the time that the cylinder pressure integrated value calculating is greater than this threshold value, think that fired state is good; In the time that the cylinder pressure integrated value calculating is less than or equal to this threshold value, think incomplete combustion or the generation of not burning completely, this circulation is used as misfiring cycle processing. For different engine operation conditions, need in advance the pressure threshold that catches fire to be carried out to Experimental Calibration, the size of the pressure threshold that catches fire is determined according to the probability situation that occurs catching fire.
5, the fuel injector of Incylinder direct injection Gasoline HCCI is except conventional oil spout before compression top center, can also ensure at the expansion stroke fuel oil that fills spray again a time. Ignition coil is accumulation of energy in advance before the top dead centre that catches fire, and lights a fire in the circulation expansion stroke moment of catching fire according to ECU instruction.
6, fill spray moment of fuel oil is depended on end time of pressure observation window. Its value 2 ° of CA after pressure observation window finish time. 2 ° of CA are selected according to the execution speed of control system, have considered that system-computed, feedback and actuator move the time spending. Time of ignition is 5 ° of CA left and right after the fuel oil that fills spray finishes. Wherein the delay of 5 ° of CA be considered to fill spray combustion oil atomization need the regular hour, this time need be carried out suitable adjustment according to engine speed.
7, when certain circulation of engine is judged as misfiring cycle, ECU sends the index pulse of catching fire, simultaneously fill spray enumeration data corresponding to moment and repairing amount count value of setting and time of ignition and fuel oil in timer internal. At expansion stroke, the oil spout moment that ECU arranges, while arrival, produces and interrupts, and ECU sends the fuel injection pulse instruction of certain time according to the repairing amount data in counter. In the time that time of ignition arrives, produce and interrupt, ECU sends firing command, excites gaseous mixture generation after-burning.
Claims (2)
1. the hcci engine Detection & Controling method of catching fire, it is characterized in that, it is Real-time Collection corner signal and cylinder pressure signal the pressure observation window that comprises compression top center is set in each working cycles of hcci engine, the terminal of pressure observation window by cylinder pressure signal the integrated value in pressure observation window compare with the pressure threshold that catches fire, when this integrated value is less than or equal to while catching fire pressure threshold, ECU sends repairing signal and ignition signal to fuel injector and ignition coil successively, in expansion stroke, the gaseous mixture catching fire in cylinder is lighted, lighting a fire at time of ignition, realize HCCI after-burning, eliminate the phenomenon of catching fire, improve hot atmosphere in cylinder, is next circulation gaseous mixture HCCI burning preparatory condition, meanwhile, the after-burning before opening by current circulating exhaust door reduces not fire HC concentration, reduces the HC discharge in tail gas,
The initial point of described pressure observation window is arranged on front 29～31 ° of CA of compression top center, and the terminal of pressure observation window is arranged on 19～21 ° of CA after compression top center, and pressure observation window is Shiftable window;
The repairing moment of fuel injector is 2 ° of CA after pressure observation window terminal; The time of ignition of ignition coil is 5 ° of CA after repairing finish time of fuel injector.
2. the hcci engine Detection & Controling method of catching fire according to claim 1, is characterized in that, described in the pressure threshold that catches fire demarcate by test.
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103835825B (en) * | 2014-02-27 | 2016-06-29 | 长城汽车股份有限公司 | Six-stroke gasoline oil machine and control method thereof and control device |
| CN105781755B (en) * | 2016-03-10 | 2018-07-06 | 吉林大学 | A kind of method that HCCI combustion load is expanded based on cylinder pressure sensor |
| CN108414230B (en) | 2018-02-14 | 2019-09-20 | 清华大学 | A kind of internal combustion engine preignition detecting method |
| CN109736957B (en) * | 2018-12-20 | 2021-09-03 | 南京理工大学 | Free piston engine starting process control method |
| CN111237076B (en) * | 2020-01-20 | 2021-12-31 | 同济大学 | Feedforward control method for incomplete combustion and detonation of homogeneous charge compression ignition engine |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5351528A (en) * | 1990-08-13 | 1994-10-04 | Mitsubishi Denki Kabushiki Kaisha | Apparatus and method for detecting misfiring in an internal combustion engine |
| CN1782356A (en) * | 2004-11-29 | 2006-06-07 | 本田技研工业株式会社 | Misfire detection apparatus |
| CN101078379A (en) * | 2006-05-24 | 2007-11-28 | 比亚迪股份有限公司 | Engine catching fire determining device and method |
| CN102052188A (en) * | 2009-10-30 | 2011-05-11 | 通用汽车环球科技运作公司 | Method and system for controlling an engine using in-cylinder pressure sensor signals |
-
2012
- 2012-08-31 CN CN201210316085.5A patent/CN102817738B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5351528A (en) * | 1990-08-13 | 1994-10-04 | Mitsubishi Denki Kabushiki Kaisha | Apparatus and method for detecting misfiring in an internal combustion engine |
| CN1782356A (en) * | 2004-11-29 | 2006-06-07 | 本田技研工业株式会社 | Misfire detection apparatus |
| CN101078379A (en) * | 2006-05-24 | 2007-11-28 | 比亚迪股份有限公司 | Engine catching fire determining device and method |
| CN102052188A (en) * | 2009-10-30 | 2011-05-11 | 通用汽车环球科技运作公司 | Method and system for controlling an engine using in-cylinder pressure sensor signals |
Non-Patent Citations (1)
| Title |
|---|
| 火花点火对缸内直喷汽油机HCCI燃烧影响;王志,王建昕，帅石金，马青峻;《内燃机学报》;万方数据库;20050325;第23卷(第2期);第106页第2段，第108页第1段 * |
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