EP0127510A1 - Verfahren zur Unterbrechung der Kraftstoffeinspritzung bei einem Innenverbrennungsmotor während der Verzögerungsphase - Google Patents

Verfahren zur Unterbrechung der Kraftstoffeinspritzung bei einem Innenverbrennungsmotor während der Verzögerungsphase Download PDF

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Publication number
EP0127510A1
EP0127510A1 EP84400898A EP84400898A EP0127510A1 EP 0127510 A1 EP0127510 A1 EP 0127510A1 EP 84400898 A EP84400898 A EP 84400898A EP 84400898 A EP84400898 A EP 84400898A EP 0127510 A1 EP0127510 A1 EP 0127510A1
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EP
European Patent Office
Prior art keywords
speed
engine
injection
period
deceleration
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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.)
Granted
Application number
EP84400898A
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English (en)
French (fr)
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EP0127510B1 (de
Inventor
Yves Boccadoro
Bernard Lepretre
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Renault SAS
Regie Nationale des Usines Renault
Original Assignee
Renault SAS
Regie Nationale des Usines Renault
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Publication of EP0127510A1 publication Critical patent/EP0127510A1/de
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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
    • 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
    • F02D41/26—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor
    • 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
    • F02D41/12—Introducing corrections for particular operating conditions for deceleration
    • F02D41/123—Introducing corrections for particular operating conditions for deceleration the fuel injection being cut-off

Definitions

  • the present invention relates to a method for cutting off the injection of fuel in the deceleration phases of an internal combustion engine.
  • This fuel injection cutoff can be triggered in response to the closing of an electrical switch indicating the closed position of the engine air flow control throttle, upon detection of a pressure threshold prevailing at the manifold. intake, upon detection of a predetermined limit injection time or the like.
  • the fuel economy achieved will be greater the longer the injection cut-off. It is therefore desirable to put the injection system back into service, that is to say injecting fuel again, at an engine speed which is as low as possible.
  • Patent GB-A-2,062,295 attempts to provide a solution to this problem by means of a process according to which the injection of fuel is interrupted in response to the detection of a deceleration, the period of rotation of the engine over consecutive equal intervals or angles of rotation, calculate the difference between the period measured over the last interval and the period measured over the previous interval, compare this difference to a fixed threshold to determine whether the engine is in slow or rapid deceleration and the fuel injection is again commanded at one or other of the two fixed thresholds of engine speed depending on whether the engine is decelerating slowly or rapidly.
  • the invention aims to eliminate these drawbacks by means of a fuel injection cut-off method for an internal combustion engine with electronically controlled injection which ensures satisfactory engine operation in terms of quality and driving pleasure, while making it possible to maximize savings in consumption by anticipating the re-coupling phenomenon when there is a risk of engine stalling.
  • the subject of the invention is a method of cutting off the fuel injection in the deceleration phases of an internal combustion engine, according to which the fuel injection is interrupted in response to the detection of a deceleration and fuel injection is re-ordered when a threshold linked to the engine speed is reached, characterized in that the speed (N) or the period of rotation (T) of the engine is measured at intervals or angles of consecutive equal rotations, we calculate the difference ( ⁇ N, ⁇ T) between the speed or period (X, T) measured on the last intern angular valle and the value ( n , n ) seen through a pass filter at the top of the speed or of the period (N n-1 , T n-1 ) measured over the previous angular interval, the said difference (AN, ⁇ T) is compared to a fixed threshold (S) and, if a deceleration condition of the engine is detected, fuel injection is again ordered when the difference (6 N, ⁇ T) is greater than the threshold ( S).
  • the graph in FIG. 1 shows an example of evolution of the speed N (t r / min) of an internal combustion engine with petrol injection and with controlled ignition of a motor vehicle.
  • N the speed of an internal combustion engine with petrol injection and with controlled ignition of a motor vehicle.
  • the engine speed is constant and, from time t 1 ′ , a deceleration under load occurs following a lift of the accelerator pedal from the driver of the vehicle.
  • time t 2 it disengages and it is noted that the deceleration of the motor is then much more accentuated than between the instants t 1 and t 2 .
  • This graph in FIG. 1 shows that the re-coupling threshold N S must be both high to avoid stalling the engine during large idle decelerations and as low as possible to maximize consumption gains during the lowest decelerations under load where the risk of stalling is not as high.
  • N S re- coupling threshold as a function of the instantaneous engine operating conditions.
  • One solution would consist in comparing the derivative of the speed or the period of the engine calculated over an angular rotation interval with a threshold which itself is a function of the speed.
  • this solution is relatively complex and cumbersome to implement.
  • the invention consists, when a deceleration condition has been detected and the fuel injection cut off, continuously comparing to a fixed threshold S the difference between the speed or period of rotation of the engine measured on the last angular interval and the speed or period measured at the previous angular interval seen through a high-pass filter, and to order fuel injection again when the difference is greater than the threshold S.
  • the angular interval chosen will be preferably equal to that which separates the passage of the pistons through top dead center, namely a half-turn in the case of a four-cylinder engine.
  • FIG. 2 describes a single-point injection system for implementing the method according to the invention.
  • a similar injection system is described in more detail in French patent application 82-13996 to which reference may be made, it being understood that the invention is not limited to such a system.
  • the single-point injection system shown comprises a programmed microcomputer 1 such as, for example, the microprocessor MC 6801, which receives on an input the value of the pressure in the intake manifold of the engine supplied by a sensor of pressure 2 and converted into digital form by an analog / digital converter 3.
  • a position sensor 4 detecting the passage of the teeth which is provided at its periphery with a target fixed on the crankshaft of the engine and rotating in synchronism with it delivers a signal which is shaped and processed in a block 5.
  • Block 5 produces a synchronization signal S identifying the passage of each cylinder through a top dead center and used by the microcomputer 1 to calculate the speed of the engine.
  • the acquisition and calculation of these "pressure” and “speed” parameters and a map which it has in memory allow the microcomputer 1 to calculate the injection time "t. Calculated” according to an appropriate algorithm. Thanks to the synchronization signal Sy and its internal clock, the microcomputer 1 controls, in the vicinity of the top dead center, the opening of an injector 7 via a power circuit 6.
  • the computer 1 is connected by one of its inputs to an electrical throttle switch 8 which closes when the engine throttle valve is in the closed position, that is to say that the driver has his foot lifted from the accelerator pedal.
  • FIG. 3 represents an algorithm which can be inserted into the main program of the injection computer 1 to implement the injection cut-off method.
  • this program as well as the cut-off algorithm takes place with a periodicity depending on the number of cylinders of the engine, that is to say at each half-turn in the case of a four-cylinder engine, which will be assumed to be the case later.
  • the first step 10 is a test on the speed N of the engine which is compared to a limit speed N 1 .
  • the injection is never cut off if the rotation speed is lower than this limit speed N 1 , for example 1100 rpm; in this case, the injection time t i is then calculated by a conventional subroutine 11 as a function, in particular, of the speed and the pressure, as indicated above.
  • a test is carried out at 12 to determine whether or not the engine is decelerating.
  • the response to this test is given by the state of the contactor 8 (opening or closing), or by any other appropriate means.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
EP84400898A 1983-05-13 1984-05-03 Verfahren zur Unterbrechung der Kraftstoffeinspritzung bei einem Innenverbrennungsmotor während der Verzögerungsphase Expired EP0127510B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8307971A FR2545878B1 (fr) 1983-05-13 1983-05-13 Procede de coupure de l'injection de carburant pendant les phases de deceleration d'un moteur a combustion interne
FR8307971 1983-05-13

Publications (2)

Publication Number Publication Date
EP0127510A1 true EP0127510A1 (de) 1984-12-05
EP0127510B1 EP0127510B1 (de) 1987-12-16

Family

ID=9288833

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84400898A Expired EP0127510B1 (de) 1983-05-13 1984-05-03 Verfahren zur Unterbrechung der Kraftstoffeinspritzung bei einem Innenverbrennungsmotor während der Verzögerungsphase

Country Status (4)

Country Link
US (1) US4558672A (de)
EP (1) EP0127510B1 (de)
DE (1) DE3468133D1 (de)
FR (1) FR2545878B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0352051A2 (de) * 1988-07-16 1990-01-24 LUCAS INDUSTRIES public limited company Motormoment-Steuerungssystem
EP1387078A1 (de) * 2001-03-19 2004-02-04 Chongqing Lifan Industry (Group) Co., Ltd. Elektrisches kraftstoffregelsystem für motorrad

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60237134A (ja) * 1984-05-07 1985-11-26 Toyota Motor Corp 内燃機関の空燃比制御装置
JPS60249645A (ja) * 1984-05-23 1985-12-10 Honda Motor Co Ltd 内燃エンジンの燃料供給制御方法
JPS63186942A (ja) * 1987-01-27 1988-08-02 Mazda Motor Corp 自動車用エンジンの燃料停止装置
US5046009A (en) * 1987-11-05 1991-09-03 Nissan Motor Company, Limited Slip suppressive drive control system for automotive vehicle with reduction of power output of internal combustion engine
US5313922A (en) * 1989-12-23 1994-05-24 Robert Bosch Gmbh Method for controlling a flow of fuel to an engine of a vehicle during overrun operation
JP2792573B2 (ja) * 1989-12-27 1998-09-03 ヤマハ発動機株式会社 燃料噴射式２サイクルエンジンの回転制御装置
JP3627419B2 (ja) * 1997-01-16 2005-03-09 日産自動車株式会社 エンジンの空燃比制御装置
US5815589A (en) * 1997-02-18 1998-09-29 Wainwright; Charles E. Push-pull transmission line loudspeaker
US5941211A (en) * 1998-02-17 1999-08-24 Ford Global Technologies, Inc. Direct injection spark ignition engine having deceleration fuel shutoff
CN103328793B (zh) * 2011-01-20 2017-09-01 丰田自动车株式会社 内燃机的控制装置

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2163241A5 (de) * 1972-09-01 1973-07-20 Bosch
US4227490A (en) * 1978-02-13 1980-10-14 Toyota Jidosha Kogyo Kabushiki Kaisha Electronic control fuel injection system which compensates for fuel drying in an intake passage
GB2060208A (en) * 1979-10-12 1981-04-29 Nissan Motor Automatic control of fuel supply in i.c. engines
GB2062295A (en) * 1979-10-12 1981-05-20 Nissan Motor Automatic control of fuel supply in ic engines
US4359993A (en) * 1981-01-26 1982-11-23 General Motors Corporation Internal combustion engine transient fuel control apparatus
FR2511430A1 (fr) * 1981-08-11 1983-02-18 Peugeot Dispositif de realimentation en carburant d'un moteur a combustion interne a la suite d'une coupure en deceleration

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS561937Y2 (de) * 1976-08-31 1981-01-17
US4130095A (en) * 1977-07-12 1978-12-19 General Motors Corporation Fuel control system with calibration learning capability for motor vehicle internal combustion engine
DE3046863A1 (de) * 1980-12-12 1982-07-22 Robert Bosch Gmbh, 7000 Stuttgart Elektronisch gesteuertes kraftstoffzumesssystem fuer eine brennkraftmaschine
JPS57200633A (en) * 1981-06-04 1982-12-08 Toyota Motor Corp Electronic controlling device for fuel injection type engine
JPS5825524A (ja) * 1981-08-07 1983-02-15 Toyota Motor Corp 電子制御燃料噴射機関の燃料噴射方法

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2163241A5 (de) * 1972-09-01 1973-07-20 Bosch
US4227490A (en) * 1978-02-13 1980-10-14 Toyota Jidosha Kogyo Kabushiki Kaisha Electronic control fuel injection system which compensates for fuel drying in an intake passage
GB2060208A (en) * 1979-10-12 1981-04-29 Nissan Motor Automatic control of fuel supply in i.c. engines
GB2062295A (en) * 1979-10-12 1981-05-20 Nissan Motor Automatic control of fuel supply in ic engines
US4359993A (en) * 1981-01-26 1982-11-23 General Motors Corporation Internal combustion engine transient fuel control apparatus
FR2511430A1 (fr) * 1981-08-11 1983-02-18 Peugeot Dispositif de realimentation en carburant d'un moteur a combustion interne a la suite d'une coupure en deceleration

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0352051A2 (de) * 1988-07-16 1990-01-24 LUCAS INDUSTRIES public limited company Motormoment-Steuerungssystem
EP0352051A3 (de) * 1988-07-16 1991-01-16 LUCAS INDUSTRIES public limited company Motormoment-Steuerungssystem
EP1387078A1 (de) * 2001-03-19 2004-02-04 Chongqing Lifan Industry (Group) Co., Ltd. Elektrisches kraftstoffregelsystem für motorrad
EP1387078A4 (de) * 2001-03-19 2007-03-14 Chongqing Lifan Ind Group Co Elektrisches kraftstoffregelsystem für motorrad

Also Published As

Publication number Publication date
FR2545878B1 (fr) 1987-09-11
EP0127510B1 (de) 1987-12-16
DE3468133D1 (en) 1988-01-28
US4558672A (en) 1985-12-17
FR2545878A1 (fr) 1984-11-16

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