CN102817738A - HCCI (homogeneous charge compression ignition) engine fire detecting and controlling method - Google Patents
HCCI (homogeneous charge compression ignition) engine fire detecting and controlling method Download PDFInfo
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- CN102817738A CN102817738A CN2012103160855A CN201210316085A CN102817738A CN 102817738 A CN102817738 A CN 102817738A CN 2012103160855 A CN2012103160855 A CN 2012103160855A CN 201210316085 A CN201210316085 A CN 201210316085A CN 102817738 A CN102817738 A CN 102817738A
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Abstract
An HCCI (homogeneous charge compression ignition) engine fire detecting and controlling method includes that a crank angle signal and a cylinder pressure signal are acquired in each working cycle of an HCCI engine, a pressure observation window with a compression top dead center is arranged, the integral value of the cylinder pressure signal in the pressure observation window is compared with a fire pressure threshold value at a finishing point of the pressure observation window, when the integral value is smaller than or equal to the fire pressure threshold value, an ECU (electronic control unit) sequentially transmits an oil recharging signal and an ignition signal to an oil injector and an ignition coil, and mixed gas in a fire cylinder is ignited in an expansion stroke. The HCCI engine fire detecting and controlling method has the advantages of simplicity, reliability, high control precision and the like, inter-circulation fluctuation of the HCCI engine can be reduced effectively, stability of combustion of a small load is improved, a running range of an HCCI combustion mode is expanded, fuel economy is improved, and HC (hydrocarbon compound) emission caused by fire is reduced.
Description
Technical field
The present invention relates to a kind of method that the combustion position of Incylinder direct injection gasoline hcci engine is carried out Detection & Controling, belong to technical field of engines.
Background technique
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) becomes one of research focus with its outstanding fuel-economizing performance and low emission performance.But the HCCI burning is controlled by Chemical Kinetics, and is very responsive to the factors such as temperature, concentration and component of mixed gas.Especially under little load condition; The heat that the unit cycle fluid produces is less; Make that hot atmosphere is relatively poor in the engine cylinder, some circulations phenomenon of can catching fire causes higher not combustion HC discharging; Catch fire meeting even directly cause engine misses of indivedual circuit, so must guarantee as far as possible that in the control procedure of hcci engine each circulation do not catch fire.But mostly the control strategy that present motor is adopted is to take the control device based on operating mode, is about to the driver-commanded different working conditions that is converted into and controls motor.In this control system, its feedback information link major part is accomplished through calibration process, only has the macroscopic view effect on the statistical significance, can not control in real time the instantaneous conditions of motor, thereby can't avoid indivedual circulations to catch fire.
Reliable detection to engine fire is the important prerequisite of control engine combustion state; The someone adopts engine speed or the ionic current basis for estimation as the state that catches fire at present, but the method that adopts engine speed to catch fire to judge lost efficacy when on the transient condition such as automobile acceleration and deceleration or the road surface of jolting, going easily; Catch fire when judging and adopt ion current signal to carry out hcci engine, because the HCCI mixed gas is rarer during little load, ion current signal is faint, poor signal to noise, and signal characteristic extracts difficult, 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, with the exhaust emissions that reduces motor and 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; Said method is the pressure observation window that collecting crankshaft angular signal and cylinder pressure signal and setting in real time comprises compression top center in each work cycle of hcci engine; Terminal point at the pressure observation window is compared the integral value of cylinder pressure signal in the pressure observation window with the pressure threshold that catches fire; When this integral value is less than or equal to when catching fire pressure threshold; ECU sends repairing signal and fire signal to oil sprayer and spark coil successively, and the mixed gas in the cylinder that in expansion stroke, will catch fire is lighted.
The above-mentioned hcci engine Detection & Controling method of catching fire, the initial point of said pressure observation window is arranged on preceding 29～31 ° of CA of compression top center, and the terminal point of pressure observation window is arranged on 19～21 ° of CA behind the compression top center.
The above-mentioned hcci engine Detection & Controling method of catching fire, the repairing of oil sprayer is 2 ° of CA behind the pressure observation window terminal point constantly; The time of ignition of spark coil is 5 ° of CA after repairing finish time of oil sprayer.
The above-mentioned hcci engine Detection & Controling method of catching fire, the said pressure threshold that catches fire is demarcated through test.
The present invention serves as the control unit with the burn cycle of motor, with the basis for estimation of cylinder pressure as the state of catching fire, eliminates the engine fire phenomenon through repairing and ignition way; It is simple and reliable to have controlling method, and control accuracy advantages of higher, said method can effectively reduce fluctuation between the hcci engine circulation; Improve little load combustion stability; Expand the range of operation of HCCI combustion manner, improve fuel economy, reduce because the HC discharging of catching fire and causing.
Description of drawings
Below in conjunction with accompanying drawing the present invention is made further detailed description.
Fig. 1 is a control strategy schematic representation of the present invention.
Embodiment
The present technique scheme is the control unit with the engine combustion cycle to Incylinder direct injection gasoline hcci engine, near compression top center, the observation window of cylinder pressure signal is set according to engine operating condition and bent axle code device signal (corner signal).Because the motor normal combustion generally occurs near the compression top center, make that part of cylinder that to explain combustion phenomena press signal also to appear near the top dead center basically.When pressing signal to carry out feedback control, only need carry out Treatment Analysis and get final product with the combustion information that obtains in the cylinder to the signal near the window area top dead center based on cylinder.According to the characteristics of HCCI burning, its velocity of combustion is very fast, generally continues several or tens crank angles.Choose according to the test experience to 20 ° of CA of atdc from 30 ° of CA of budc between window region, can satisfy the needs of combustion phenomena observation and subsequent control.When the little load burning of hcci engine border is moved, adopt the cycle analysis means, the real-time monitored that circulates one by one cylinder pressure signal.When current circulation observation finishes, formulate the evaluation algorithm of catching fire according to the integral value of cylinder pressure signal in observation window, control system is thought and is set the sign that catches fire when phenomenon having taken place to catch fire in the cylinder.Control system according to the sign that catches fire utilize direct fuel-injection engine flexibly injection characteristics send repairing amount, repairing constantly and the time of ignition instruction.Carry out a small amount of oil spout constantly in repairing, light a fire, realize the HCCI after-burning, eliminate the phenomenon of catching fire, improve hot atmosphere in the cylinder, be next circulation mixed gas HCCI burning preparatory condition at time of ignition; Simultaneously, open after-burning before through current circulating exhaust door and reduce not fire HC concentration, reduce the HC discharging in the tail gas.
The detailed description of technological scheme of the present invention:
1, the present technique scheme relates to the means that adopt cycle analysis, circularly the HCCI combustion position is analyzed one by one.Gather cylinder pressure signal through cylinder pressure sensor, extract near the interior pressure integral value of the pressure observation window of compression top center as the cylinder pressure characteristics value, as the basis for estimation of combustion regime.
2, the pressure observation window is removable window, and pressure observation window initial point is catching fire about 30 ° of CA of budc, and pressure observation window terminal point is about 20 ° of CA behind the compression top center.The angle value of concrete initial point and terminal point is obtained by the bent axle encoder to count, and is relevant with the operating conditions of motor, need carry out confirming after the statistical analysis according to the demarcation situation of burning mass laboratory data.
3, in circulation of motor, begin from exhaust top dead center, ECU ECU begins to detect the output signal of cylinder pressure sensors.Begin from pressure observation window initial point, the output signal of cylinder pressure sensors is input to the cylinder pressure signal integration module and carries out integral operation in real time, up to pressure observation window finish time.After calculating end, cylinder pressure signal integral value input ECU.
4, the evaluation algorithm of catching fire is following: according to the pressure threshold that catches fire that configures in advance to motor certain circulation whether catch fire and judge.When the cylinder pressure integral value that calculates during, think that combustion regime is good greater than this threshold value; When the cylinder pressure integral value that calculates is less than or equal to this threshold value, think incomplete combustion or fully burning take place, this circulation is used as the circular treatment of catching fire.For different engine operation conditions, need in advance the pressure threshold that the catches fire demarcation that makes an experiment, the size of the pressure threshold that catches fire is decided according to the probability situation that occurs catching fire.
5, the oil sprayer of Incylinder direct injection gasoline hcci engine is except conventional oil spout before compression top center, can also guarantee at the expansion stroke fuel oil that fills spray again a time.Spark coil is accumulation of energy in advance before the top dead center that catches fire, and instruction is lighted a fire at the circulation expansion stroke that catches fire constantly according to ECU.
6, fill spray moment of fuel oil is depended on concluding time of pressure observation window.Its value is at pressure observation window 2 ° of CA after the finish time.2 ° of CA are selected according to the execution speed of control system, have considered the time that system-computed, feedback and final controlling element action are spent.Time of ignition is to finish about back 5 ° of CA at the fuel oil that fills spray.Wherein the delay of 5 ° of CA is that the atomizing of fuel oil of having considered to fill spray needs the regular hour, and this time needs carry out suitable adjustment according to engine speed.
7, certain circulation of motor is judged as the circulation time that catches fire, and ECU sends the index pulse of catching fire, simultaneously setting and time of ignition and fuel oil corresponding enumeration data and the repairing amount count value of the moment that fill spray in timer internal.At expansion stroke, when the oil spout that ECU is provided with arrives constantly, produce and interrupt, ECU sends the fuel injection pulse instruction of certain time according to the repairing amount data in the counter.When time of ignition arrives, produce and interrupt, ECU sends firing command, excites mixed gas generation after-burning.
Claims (4)
1. hcci engine Detection & Controling method of catching fire; It is characterized in that; It is the pressure observation window that collecting crankshaft angular signal and cylinder pressure signal and setting in real time comprises compression top center in each work cycle of hcci engine; Terminal point at the pressure observation window is compared the integral value of cylinder pressure signal in the pressure observation window with the pressure threshold that catches fire; When this integral value is less than or equal to when catching fire pressure threshold, ECU sends repairing signal and fire signal to oil sprayer and spark coil successively, and the mixed gas in the cylinder that in expansion stroke, will catch fire is lighted.
2. according to the said hcci engine of the claim 1 Detection & Controling method of catching fire, it is characterized in that the initial point of said pressure observation window is arranged on preceding 29～31 ° of CA of compression top center, the terminal point of pressure observation window is arranged on 19～21 ° of CA behind the compression top center.
3. according to claim 1 or the 2 said hcci engines Detection & Controling method of catching fire, it is characterized in that the repairing of oil sprayer is 2 ° of CA behind the pressure observation window terminal point constantly; The time of ignition of spark coil is 5 ° of CA after repairing finish time of oil sprayer.
4. according to the said hcci engine of the claim 3 Detection & Controling method of catching fire, it is characterized in that the said pressure threshold that catches fire is demarcated through test.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103835825A (en) * | 2014-02-27 | 2014-06-04 | 长城汽车股份有限公司 | Six-stroke gasoline engine and control method and device thereof |
| CN105781755A (en) * | 2016-03-10 | 2016-07-20 | 吉林大学 | Method for expanding HCCI combustion load on basis of cylinder pressure sensor |
| CN109736957A (en) * | 2018-12-20 | 2019-05-10 | 南京理工大学 | A kind of free-piston engine start-up course control method |
| WO2019157839A1 (en) * | 2018-02-14 | 2019-08-22 | 清华大学 | Preignition detection method for internal combustion engine |
| CN111237076A (en) * | 2020-01-20 | 2020-06-05 | 同济大学 | Feedforward control method for incomplete combustion and detonation of homogeneous charge compression ignition engine |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103835825A (en) * | 2014-02-27 | 2014-06-04 | 长城汽车股份有限公司 | Six-stroke gasoline engine and control method and device thereof |
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| CN105781755A (en) * | 2016-03-10 | 2016-07-20 | 吉林大学 | Method for expanding HCCI combustion load on basis of cylinder pressure sensor |
| 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 |
| WO2019157839A1 (en) * | 2018-02-14 | 2019-08-22 | 清华大学 | Preignition detection method for internal combustion engine |
| US10809155B2 (en) | 2018-02-14 | 2020-10-20 | Tsinghua University | Method for detecting pre-ignition of internal combustion engine |
| CN109736957A (en) * | 2018-12-20 | 2019-05-10 | 南京理工大学 | A kind of free-piston engine start-up course control method |
| CN109736957B (en) * | 2018-12-20 | 2021-09-03 | 南京理工大学 | Free piston engine starting process control method |
| CN111237076A (en) * | 2020-01-20 | 2020-06-05 | 同济大学 | Feedforward control method for incomplete combustion and detonation of homogeneous charge compression ignition engine |
| 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 |
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| CN102817738B (en) | 2016-05-04 |
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