EP0146426B1 - Verfahren für die Steuerung eines Motors mit durch Lambdasonde regulierter Kraftstoffeinspritzung und gesteuerter Zündung - Google Patents
Verfahren für die Steuerung eines Motors mit durch Lambdasonde regulierter Kraftstoffeinspritzung und gesteuerter Zündung Download PDFInfo
- Publication number
- EP0146426B1 EP0146426B1 EP84402175A EP84402175A EP0146426B1 EP 0146426 B1 EP0146426 B1 EP 0146426B1 EP 84402175 A EP84402175 A EP 84402175A EP 84402175 A EP84402175 A EP 84402175A EP 0146426 B1 EP0146426 B1 EP 0146426B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- engine
- enrichment
- injection time
- mixture
- nominal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/04—Introducing corrections for particular operating conditions
- F02D41/10—Introducing corrections for particular operating conditions for acceleration
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D37/00—Non-electrical conjoint control of two or more functions of engines, not otherwise provided for
- F02D37/02—Non-electrical conjoint control of two or more functions of engines, not otherwise provided for one of the functions being ignition
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
- F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
- F02D41/2425—Particular ways of programming the data
- F02D41/2429—Methods of calibrating or learning
- F02D41/2451—Methods of calibrating or learning characterised by what is learned or calibrated
- F02D41/2454—Learning of the air-fuel ratio control
- F02D41/2458—Learning of the air-fuel ratio control with an additional dither signal
Definitions
- the present invention relates to a method for controlling a fuel injection and spark-ignition engine by means of an electronic computer coupled to a probe for detecting the oxygen content of the exhaust gases, hereinafter referred to as .
- the probe A is an all-or-nothing sensor whose output voltage is either higher or lower than a certain threshold depending on whether the oxygen content of the exhaust gases is lower or higher than a predetermined value.
- This oxygen content of the exhaust gases is itself an image of the mixture of air and fuel admitted into the engine: a lean mixture generates an excess of oxygen in the exhaust gases and a rich mixture a deficit of oxygen, the threshold of the probe A corresponding to the stoichiometric ratio.
- Such a probe A can thus be used in combination with an injection computer to measure the air / fuel mixture admitted into the engine as a function of the oxygen content of the exhaust gases.
- This regulation makes it possible in particular to reduce the emissions of toxic components from spark-ignition engines as required by national regulations in a certain number of countries.
- probe A Another advantage of such regulation by probe A lies in the possibility of operating the engine in a lean mixture, at least in certain areas of its operating range, in order to minimize fuel consumption and reduce the emissions of mono- carbon monoxide and unburnt hydrocarbons.
- Document US-A-4 200 064 describes an electronic injection engine operating in lean mixture, with periodic calibration of the deviation from the stoichiometric mixture for which the signal from the probe A can be used. This requires a temporary enrichment of the air-fuel mixture used for each calibration starting from the lean mixture, periodically.
- the temporary advance reduction is generated a predetermined number of engine revolutions after the start of the temporary enrichment.
- a positive ignition engine 1 comprises an intake pipe 2, in which an injector 3 is arranged downstream of a throttle valve 4, and an exhaust pipe 5.
- the opening time of the injector 3, which determines the dosage of the air / fuel mixture, is controlled by a digital computer 6 which receives from a pressure sensor 7 information relating to the air pressure in the intake pipe 2 and of a speed sensor 8 information relating to the speed of rotation of the engine 1.
- the sensor8 is associated with a toothed target 9 integral in rotation with the crankshaft (not shown) of the engine 1 and from which certain teeth have been removed: the signal sensor output8 is thus used by the computer to determine both the speed and the angular position of the crankshaft as described in European document EP-A-0013846.
- the computer 6 also receives the output signals from a probe ⁇ 10 disposed in the exhaust pipe 5 and from a temperature sensor 11 disposed in the cooling water circuit 12 of the engine 1.
- the computer 6 also develops the ignition advance angle as a function of the engine speed and load parameters and controls the instant of ignition of the mixture in a cylinder 13 of the engine by a spark plug 14.
- the computer 6 has in memory a map making it possible to calculate the injection time as a function of the speed and of the engine load.
- This mapping corresponds to a basic injection time Tlo determining an operation of the engine in lean mixture.
- the speed and the load of the engine, and therefore the basic injection time Tlo are assumed to be constant.
- the computer 6 causes an additional enrichment of the mixture by increasing the injection time by a value b during a number of engine revolutions a.
- the quantities a and b are calculated so that, at the operating point considered, the probe A is at the limit of tilting.
- it is examined whether the probe A has switched from one state to another during this period c: if so, the injection time of base and, if not, it is increased by an equally small amount, which leads to a nominal injection time Tln different from the base time Tlo.
- this temporary enrichment (a, b) tends to generate an increase in torque which, in accordance with the invention, is compensated by an equally temporary reduction in the angle of advance on ignition.
- this comprises in memory an addressable advance map as a function of the pressure and the engine speed and generates a basic advance angle Avo.
- the advance angle Avo is reduced by an amount e during a number of revolutions f.
- the values of a, b, c, d, e, f and g depend on the type of injection system and on the characteristics of the engine considered.
- the duration of the advance enrichment and blurring slots (a, f) can be fixed because the injectors deliver the fuel directly on the intake valves.
- the duration of the enrichment and pre-blurring slots should then preferably depend of the engine operating point, which can be achieved by memorization, of a specific map in the digital advance and injection computer 6.
- the amplitude b of the enrichment window is preferably inversely proportional to the nominal richness, that is to say to the nominal injection time, for the considered operating point of the engine, while the value e of the advance blurring is preferably proportional to l amplitude b of the enrichment window.
- the phase shift g between the enrichment slot and the advance dimming slot can be either fixed, or a function of the engine load and speed. The same goes for the repetition period d of the temporary enrichment process and for the number of revolutions c at the end of which the condition of the probe is examined. If a is fixed, it is preferably also, but if a depends on the load and the engine speed, c can either depend on the same parameters, or be a predetermined number of turns counted from the end of the slot. enrichment.
- the regulation by temporary enrichment and blurring described above may only be carried out in certain engine operating zones.
- This type of regulation will preferably be avoided in the field of high loads (rich mixture), low loads (deceleration zones) and low speeds (stability problems).
- This regulation should preferably also be prohibited during operations in transient or cold conditions because of deceleration cuts and acceleration and cold enrichments which can be expected and that the described regulation would disturb.
- FIG. 3 precisely illustrates an embodiment of the invention which eliminates regulation by temporary enrichment and blurring in advance in the above-mentioned operating zones.
- the values of a, c, d, f and g will be assumed to be fixed.
- the response to at least one of tests 21 to 24 is negative and we pass to test 25.
- the state of the probe ⁇ used as a loopback criterion for an injection system programmed to operate in lean mixture, is used so as to periodically make the mixture generated tend to the stoichiometric report.
- This results in modifications to the programmed base injection time which ensure self-adaptive control of the nominal richness for each operating point of the engine programmed in the map of the computer, which makes it possible to overcome variations in characteristics due engine aging.
- This regulation is made acceptable in its application on a motor vehicle by the fact that the excess torque normally generated by the periodic enrichment is considerably attenuated by the periodic blurring in advance carried out.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Claims (11)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8317538A FR2554509B1 (fr) | 1983-11-04 | 1983-11-04 | Procede de commande d'un moteur a injection de carburant regulee par sonde l et a allumage commande |
FR8317538 | 1983-11-04 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0146426A1 EP0146426A1 (de) | 1985-06-26 |
EP0146426B1 true EP0146426B1 (de) | 1988-05-11 |
Family
ID=9293783
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP84402175A Expired EP0146426B1 (de) | 1983-11-04 | 1984-10-30 | Verfahren für die Steuerung eines Motors mit durch Lambdasonde regulierter Kraftstoffeinspritzung und gesteuerter Zündung |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0146426B1 (de) |
DE (1) | DE3471131D1 (de) |
FR (1) | FR2554509B1 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04502045A (ja) * | 1988-12-10 | 1992-04-09 | ローベルト・ボッシュ・ゲゼルシャフト・ミット・ベシュレンクテル・ハフツング | ガソリン噴射装置の適応加速濃化 |
FR2721653A1 (fr) * | 1994-06-27 | 1995-12-29 | Siemens Automotive Sa | Procédé et dispositif de réduction des émissions de polluants d'un moteur à combustion interne. |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4200064A (en) * | 1977-04-27 | 1980-04-29 | Fabbrica Italiana Magneti Marelli S.P.A. | Electronic apparatus for feed control of air-gasoline mixture in internal combustion engines |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2834638A1 (de) * | 1978-08-08 | 1980-02-28 | Bosch Gmbh Robert | Vorrichtung zur wenigstens teilweisen unterbrechung der kraftstoffzufuhr bei vorzugsweise in fahrzeugen eingebauten brennkraftmaschinen im schiebetrieb |
DE2852715C2 (de) * | 1978-12-06 | 1981-02-19 | Volkswagenwerk Ag, 3180 Wolfsburg | Verfahren zum Betrieb einer Brennkraftmaschine und Brennkraftmaschine zur Durchführung des Verfahrens |
JPS5945824B2 (ja) * | 1979-04-06 | 1984-11-08 | 日産自動車株式会社 | 内燃機関の空燃比制御装置 |
JPS5623532A (en) * | 1979-08-02 | 1981-03-05 | Fuji Heavy Ind Ltd | Air-fuel ratio controller |
DE3022427A1 (de) * | 1980-06-14 | 1982-01-07 | Robert Bosch Gmbh, 7000 Stuttgart | Steuervorrichtung fuer die kraftstoff-luft-gemischaufbereitung in brennkraftmaschinen |
JPS58104342A (ja) * | 1981-12-16 | 1983-06-21 | Toyota Motor Corp | 内燃機関の空燃比制御方法 |
-
1983
- 1983-11-04 FR FR8317538A patent/FR2554509B1/fr not_active Expired
-
1984
- 1984-10-30 EP EP84402175A patent/EP0146426B1/de not_active Expired
- 1984-10-30 DE DE8484402175T patent/DE3471131D1/de not_active Expired
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4200064A (en) * | 1977-04-27 | 1980-04-29 | Fabbrica Italiana Magneti Marelli S.P.A. | Electronic apparatus for feed control of air-gasoline mixture in internal combustion engines |
Also Published As
Publication number | Publication date |
---|---|
FR2554509B1 (fr) | 1988-03-18 |
FR2554509A1 (fr) | 1985-05-10 |
EP0146426A1 (de) | 1985-06-26 |
DE3471131D1 (en) | 1988-06-16 |
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