CN102518522A - Split cylinder independent closed loop control method for homogeneous charge compression ignition (HCCI) combustion on basis of knock sensor - Google Patents

Split cylinder independent closed loop control method for homogeneous charge compression ignition (HCCI) combustion on basis of knock sensor Download PDF

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Publication number
CN102518522A
CN102518522A CN2011104394278A CN201110439427A CN102518522A CN 102518522 A CN102518522 A CN 102518522A CN 2011104394278 A CN2011104394278 A CN 2011104394278A CN 201110439427 A CN201110439427 A CN 201110439427A CN 102518522 A CN102518522 A CN 102518522A
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cylinder
value
hcci
combustion
knock
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CN102518522B (en
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王志
王建昕
徐雅齐
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Tsinghua University
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Tsinghua University
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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
    • Y02T10/12—Improving ICE efficiencies

Abstract

The invention discloses a split cylinder independent closed loop control method for homogeneous charge compression ignition (HCCI) combustion on the basis of a knock sensor, which belongs to the technical field of internal combustion engines and comprises the following steps of utilizing the knock sensor to detect a vibration signal during combustion of the engine; utilizing an electronic control unit (ECU) to perform integral evaluation to obtain a knock strength value according to a vibration signal of the knock sensor; and setting a target value, an upper limit value and a lower limit value of knock input (KI)_i in an ECU procedure. When the knock strength of some cylinder is higher than KI_max, the oil jetting ratio for secondary jetting in the cylinder is increased to enable combustion phase to be delayed; and when the knock strength value of the cylinder is lower than KI_min, the oil jetting ratio for the secondary jetting in the cylinder is decreased to enable the combustion phase to be advanced. Therefore, based on the signal of the knock sensor, the KI_i value is controlled in a closed loop mode, and the HCCI combustion is stabilized in a state close to knock but not enabling knock to happen. Simultaneously, HCCI combustion can not cause fire so that the problem of large difficulty in controlling fire of a petrol HCCI engine is solved. The combustion control method is based on the knock sensor; and compared with a cylinder pressure sensor, cost is low, and reliability is high.

Description

A kind of HCCI burning based on detonation sensor divides cylinder independence closed loop control method
Technical field
The present invention relates to technical field of internal combustion engines, particularly relate to a kind of method of dividing the closed loop control of cylinder independence based on the HCCI burning of detonation sensor.
Background technique
Homogeneous charge compression ignition (HCCI) burning is a kind of high-efficiency cleaning combustion manner.Hcci engine is with respect to the conventional spark-ignition petrol engine; Have and reduce oil consumption 15%～20%, reduce NOx discharging 90%～99% and do not have the potentiality that soot (PM) discharges; Thoroughly solve NOx and these those long mutual exclusion (Trade-off) relations that disappear of PM in the engine exhaust, be applied to the requirement that automobile power can satisfy the fuel economy and the Abgasgesetz of increasingly stringent.But HCCI burning is too responsive to engine operational conditions (coolant water temperature, intake temperature, engine speed, fuel qualities etc.), catches fire and smooth combustion control is the biggest problem of gasoline HCCI industrialization.
The HCCI burning is by the chemical kinetics master control of mixed gas, and hcci engine keeps the ignition timing and the rate of burning of optimum more difficult than conventional engine.Existing document shows, in order to control fire burns, mainly is the Steady-State Control method through the laboratory stand test at present, leads like change intake temperature, air fuel ratio, compression ratio, EGR etc.But these ways and means control responses are slow, are difficult to practical under production engine instantaneous conditions condition.Simultaneously, each cylinder of multicylinder engine is owing to the receptance of HCCI burning, and each cylinder working occurs inhomogeneous easily.Therefore; Only find some closed loop control and cost means not high, that be easy in real-world operation, regulate as the spark ignition of conventional gasoline machine; Adopt simultaneously and divide cylinder independently to control; Just can make the HCCI burning can both guarantee reliable and stable catching fire, could realize the industrialization of multi-cylinder hcci engine in different operating modes.
GM company was transformed into hcci engine with a direct spray petrol engine in cylinder in 2007, installed additional at the combustion chamber of petrol engine open interior and controlled the HCCI burning after cylinder pressure sensor feedback in-cylinder pressure signal provides ECU to come computational analysis.Adopt the demonstration car of this hcci engine, oil consumption reduces by 15%, and discharging need not lean-burn NOx catalyzer.But adopt cylinder pressure sensor closed loop control HCCI burning, the sensor cost is high, and control algorithm is complicated, poor reliability, and the industrialization feasibility is poor.
Generally speaking; The result of study of big petrol HCCI burning shows, but in the HCCI range of operation, gasoline HCCI burning mainly presents the single phase exothermal character; Rate of burning is fast, normally catches fire to occur near the scope very narrow top dead center (5 ℃ of A ATDC～+ 5 ℃ A ATDC).If catch fire too early, then easily pinking takes place and the thermal efficiency is low; In the evening if caught fire, then catch fire easily, combustion instability and voltage rise rate be low.The ignition timing of this HCCI burning can be used to control HCCI and catch fire the receptance of pinking, realizes that stable HCCI burning guarantees the high thermal efficiency simultaneously.
Summary of the invention
The invention provides a kind of method of dividing the closed loop control of cylinder independence based on the HCCI burning of detonation sensor; Big to overcome HCCI burning control difficulty, and cylinder pressure sensor closed loop control HCCI burning causes cylinder pressure sensor cost height, poor reliability, the combustion system of engine change is big, the ECU control algorithm is complicated, the defective of industrialization feasibility difference owing to adopting in the existing exemplary teachings.
For achieving the above object, technological scheme of the present invention may further comprise the steps:
Vibration signal during the burning of detonation sensor detection of engine;
ECU obtains detonation sensor vibration signal integration according to engine firing order the knock intensity value KI_i of each cylinder; In program, set desired value KI_0, CLV ceiling limit value KI_max and the lower limit KI_min of KI_i;
When the knock intensity KI_i of certain cylinder is higher than KI_max, increase the oil spout ratio of spraying I2 for the second time in this cylinder cylinder, make combustion phase postpone, thereby knock intensity KI_i value reduce; When the KI_i value is lower than KI_min, reduce the interior oil spout ratio of spraying for the second time of this cylinder, make combustion phase in advance, thereby knock intensity KI_i value raise, make each cylinder KI_i value fluctuate up and down near remaining on desired value KI_0.
Described motor is a direct spray petrol engine in cylinder, and every cyclic spray 2 times, time for spraying have 3 possible crank angles interval, is respectively negative valve overlap phase, aspirating stroke and compression stroke.
The desired value KI_0 of said KI_i, CLV ceiling limit value KI_max and lower limit KI_min confirm through engine calibration; KI_max is the detonation sensor integral value under the acceptable maximum engine knock strength condition of this motor; KI_min is the detonation sensor integral value under the acceptable maximum combustion circular wave of this motor condition, and KI_0 is the mean value of KI_max and KI_min.
The present invention has following advantage:
Adopt when of the present invention, can realize stable HCCI burning, the HCCI ignition timing can be stabilized near the top dead center, pinking neither can take place also can not catch fire.It has solved HCCI burning and has received engine operational conditions hypermetamorphosis sensitive issue (pinking takes place easily or catch fire).Simultaneously; Because detonation sensor just belonged to the ripe means that electronic injection gasoline engine detects pinking originally, the present invention adopts detonation sensor feedback control HCCI burning, makes full use of the pinking receptance of HCCI burning; Need not to transform the original combustion system of motor; And its cost is low, and control strategy is simple, and the industrialization feasibility is high.
Description of drawings
Fig. 1 is the engine system schematic representation that the present invention is based on the HCCI burning branch cylinder independence closed loop control method of detonation sensor;
Fig. 2 under the HCCI combustion mode of the present invention based on the control logic figure of the knock intensity closed loop control method of detonation sensor signal;
Fig. 3 is a HCCI petrol engine oil spout strategy schematic representation of the present invention;
Fig. 4 is the structural representation of the combustion system under the petrol engine HCCI combustion mode of the embodiment of the invention;
Fig. 5 is that the embodiment of the invention is according to detonation sensor calculated signals knock intensity schematic representation;
Fig. 6 is the flow chart that the present invention is based on the HCCI burning branch cylinder independence closed loop control method embodiment of detonation sensor.
Fig. 7 divides HCCI indicator diagram and the state of rate of heat release before the closed loop control of cylinder independence for the embodiment of the invention based on pinking.
Fig. 8 divides HCCI indicator diagram and the state of rate of heat release after the closed loop control of cylinder independence for the embodiment of the invention based on pinking.
Embodiment
The invention provides the method that a kind of HCCI burning based on detonation sensor divides the closed loop control of cylinder independence, below in conjunction with accompanying drawing and embodiment, specific embodiments of the invention describes in further detail.Following examples are used to explain the present invention, but are not used for limiting scope of the present invention.
The method of the invention may further comprise the steps, and its flow chart is as shown in Figure 6:
Step 1, the vibration signal the during burning of detonation sensor detection of engine.
Step 2, ECU obtains detonation sensor vibration signal integration according to engine firing order knock intensity (KI_i) value of each cylinder.When pinking took place in the HCCI burning, the detonation signal sensor produced voltage signal and strong sawtooth wave occurs, like Fig. 5; This voltage waveform integration that in ℃ A ATDC crank angle range of-20 ℃ of A ATDC～20, takes absolute value is obtained each cylinder KI_i value;
Step 3 compares KI_i and KI_0.
Step 4 is if KI_i＞KI_max then increases secondary fuel injection ratio I 2/ I 1, like Fig. 3; Promptly increase and spray oil mass I for the second time 2(intake stroke fuel injection quantity) reduces and sprays oil mass I for the first time 1(negative valve overlap during fuel injection quantity) reduced activating effect and thermal effect during the negative valve overlap like this, thereby reduced the inflammable mixture pyrophorisity with regard to the cooling effect of having strengthened cylinder-in oil-jet, make the phase place of catching fire postpone, and knock intensity reduces.(twice oil spout ratio of the change of using here can change the principle of HCCI combustion phase and control pinking; Can see for details data " Wang Zhi; Wang Jianxin; handsome stone gold. the research of in-cylinder direct injection fuel modifying control HCCI ignition timing and rate of burning. physical science makes progress .2006,16 (9): 1191-1195 ").Otherwise,, realize HCCI smooth combustion if KI_i＜KI_max then adopts opposite oil spout adjustment strategy, thereby makes each cylinder KI_i remain near the desired value (KI_0).
The structural representation of a kind of gasoline direct injection engines stratified equivalent proportion combustion system of the embodiment of the invention is as shown in Figure 4.This combustion system cylinder bore is 83.5 millimeters, and compression ratio is 13, uses the high pressure gasoline electric-controlled fuel injector, adopts twice injection.In in same work cycle, the fuel injection pulse signal (the control oil spout moment and fuel injection quantity) according to ECU provides carries out spraying the first time I during negative valve overlap 1, spraying into 20% fuel, oil spout is 45 ° of air inlet budc constantly, these fuel form the upgrading mixed gas during negative valve overlap, and a small amount of heat release; In the process stroke, carry out spraying the second time I then 2, spraying into 80% fuel, oil spout is 100 ° of air inlet atdc constantly, these fuel cool off mixed gas in the cylinder in intake stroke.Like this, when compression top center in the cylinder inflammable mixture temperature can pass through twice oil spout ratio I 1/ I 2Adjust, thus control ignition timing and knock intensity.Through detonation sensor perception knock intensity KI, when KI greater than 8, this moment the pressure maximum rise rate greater than 6bar/ ℃ of A, pinking is serious, ECU judges that through setting value relatively the knocking state of this cylinder is true, this moment, ECU sent instruction, progressively reduced oil spout ratio I 1/ I 2Making catches fire postpones, and the pressure maximum rise rate is reduced to 4bar/ ℃ of A, and KI reduces; When KI less than 4, catch fire later this moment, combustion instability, ECU judges that through setting value relatively the knocking state of this cylinder is false, sending instruction progressively increases oil spout ratio I 1/ I 2Make and catch fire in advance that the pressure maximum rise rate improves, KI raises, thereby make motor be in all the time near knocking state pinking does not take place, and ignition timing remains near the TDC, has guaranteed efficient burning.
The above only is a preferred implementation of the present invention; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from know-why of the present invention; Can also make some improvement and retouching, these improvement and retouching also should be regarded as protection scope of the present invention.

Claims (3)

1. the method based on the HCCI burning branch cylinder independence closed loop control of detonation sensor is characterized in that, said method comprising the steps of:
Vibration signal during the burning of detonation sensor detection of engine;
ECU obtains detonation sensor vibration signal integration according to engine firing order the knock intensity value KI_i of each cylinder; In program, set desired value KI_0, CLV ceiling limit value KI_max and the lower limit KI_min of KI_i;
When the knock intensity KI_i of certain cylinder is higher than KI_max, increase the oil spout ratio of spraying I2 for the second time in this cylinder cylinder, make combustion phase postpone, thereby knock intensity KI_i value reduce; When the KI_i value is lower than KI_min, reduce the interior oil spout ratio of spraying for the second time of this cylinder, make combustion phase in advance, thereby knock intensity KI_i value raise, make each cylinder KI_i value fluctuate up and down near remaining on desired value KI_0.
2. method of dividing the closed loop control of cylinder independence based on the HCCI burning of detonation sensor according to claim 1; It is characterized in that; Described motor is a direct spray petrol engine in cylinder, and every cyclic spray 2 times, time for spraying have 3 possible crank angles interval; Be respectively negative valve overlap phase, aspirating stroke and compression stroke.
3. method of dividing the closed loop control of cylinder independence based on the HCCI burning of detonation sensor according to claim 1; It is characterized in that; The desired value KI_0 of said KI_i, CLV ceiling limit value KI_max and lower limit KI_min confirm through engine calibration; KI_max is the detonation sensor integral value under the acceptable maximum engine knock strength condition of this motor; KI_min is the detonation sensor integral value under the acceptable maximum combustion circular wave of this motor condition, and KI_0 is the mean value of KI_max and KI_min.
CN201110439427.8A 2011-12-23 2011-12-23 Split cylinder independent closed loop control method for homogeneous charge compression ignition (HCCI) combustion on basis of knock sensor Expired - Fee Related CN102518522B (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103334846A (en) * 2013-07-23 2013-10-02 清华大学 Method for judging and controlling super detonation
CN103758641A (en) * 2014-01-14 2014-04-30 上海交通大学 Gasoline engine knocking judging and occurrence time predicting method considering influence of external exhaust gas recirculation (EGR)
CN106706205A (en) * 2015-07-24 2017-05-24 联合汽车电子有限公司 Engine detonation detection method and preignition detection method of 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
CN113309626A (en) * 2021-06-29 2021-08-27 南京航空航天大学 Detonation suppression method for two-stroke aviation kerosene engine

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CN101263288A (en) * 2004-12-27 2008-09-10 株式会社日本自动车部品综合研究所 Control device for internal combustion engine
CN101634250A (en) * 2008-07-21 2010-01-27 福特环球技术公司 Engine control including knock compensation
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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103334846A (en) * 2013-07-23 2013-10-02 清华大学 Method for judging and controlling super detonation
CN103334846B (en) * 2013-07-23 2016-03-30 清华大学 A kind of judgement of super detonation and controlling method
CN103758641A (en) * 2014-01-14 2014-04-30 上海交通大学 Gasoline engine knocking judging and occurrence time predicting method considering influence of external exhaust gas recirculation (EGR)
CN103758641B (en) * 2014-01-14 2016-02-10 上海交通大学 A kind of Engine Knock comprising external exhaust gas recirculation impact judges and the Forecasting Methodology in moment occurs
CN106706205A (en) * 2015-07-24 2017-05-24 联合汽车电子有限公司 Engine detonation detection method and preignition detection method of 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
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
CN113309626A (en) * 2021-06-29 2021-08-27 南京航空航天大学 Detonation suppression method for two-stroke aviation kerosene engine

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