EP0684376A1 - Système électronique d'identification des cycles pour moteurs à combustion interne - Google Patents

Système électronique d'identification des cycles pour moteurs à combustion interne Download PDF

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Publication number
EP0684376A1
EP0684376A1 EP95107844A EP95107844A EP0684376A1 EP 0684376 A1 EP0684376 A1 EP 0684376A1 EP 95107844 A EP95107844 A EP 95107844A EP 95107844 A EP95107844 A EP 95107844A EP 0684376 A1 EP0684376 A1 EP 0684376A1
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EP
European Patent Office
Prior art keywords
cylinder
engine
strokes
crankshaft
zero reference
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.)
Granted
Application number
EP95107844A
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German (de)
English (en)
Other versions
EP0684376B1 (fr
Inventor
Roberto Flora
Gabriele Serra
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.)
Marelli Europe SpA
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Magneti Marelli SpA
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Publication date
Application filed by Magneti Marelli SpA filed Critical Magneti Marelli SpA
Publication of EP0684376A1 publication Critical patent/EP0684376A1/fr
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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
    • F02D41/009—Electrical control of supply of combustible mixture or its constituents using means for generating position or synchronisation signals
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/02—Engines characterised by their cycles, e.g. six-stroke
    • F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
    • F02B2075/027—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle four

Definitions

  • the present invention relates to an electronic system for identifying the strokes of an internal combustion engine.
  • a microprocessor-based electronic controller receives at its input a plurality of data signals (for example, the number of engine revolutions, the throttle position, the intake air temperature, the cooling water temperature, etc.), and generates at its output the injection stroke and time for the different injectors.
  • a plurality of data signals for example, the number of engine revolutions, the throttle position, the intake air temperature, the cooling water temperature, etc.
  • Multipoint one injector per cylinder
  • stroke-dependent the fuel is injected in the suction stroke
  • angular reference systems permitting the recognition of the engine strokes (suction, compression, expansion, exhaust) present in the different cylinders of the engine.
  • the known angular reference systems use two angular position sensors: a first sensor which can supply a signal of the angular position of the crankshaft (with an interval of 3600) and a second sensor (with an interval of 7200) which can supply a signal of the angular position of the camshaft.
  • the first angular position sensor conveniently consists of a toothed pulley keyed to the crankshaft and a fixed sensor which can supply a pulse at the moment at which one tooth of the pulley passes in front of the fixed sensor.
  • the toothed pulley also has a flattened portion, formed for example by the omission of two teeth, which is used as a zero reference for identifying the upper dead centres of the different cylinders of the engine.
  • the upper dead centre of each cylinder of the engine is found, with an indeterminacy of 3600, in a specified angular position with respect to the zero reference.
  • the upper dead centres of the different cylinders are then identified by counting specified numbers of pulses following the detection of the zero reference.
  • the second sensor consists of a toothed pulley keyed to the camshaft and a fixed sensor which can supply at its output a first signal level corresponding to a first zero reference detected by the first sensor and a second signal level corresponding to a subsequent detection of the zero reference.
  • the second sensor is used to eliminate the 360 ° indeterminacy of the first sensor.
  • the known systems also have electronic controllers which receive the signals generated by the first and second sensors and process them to obtain the data on the engine strokes (suction, compression, expansion, exhaust) of the different cylinders.
  • the known angular reference systems entail a considerable complexity of construction and high costs.
  • the processing of the signals generated by the two sensors is also complex.
  • the object of the present invention is to provide an electronic system for identifying the strokes of an internal combustion engine which resolves the problems of the known systems.
  • the object of the present invention is to provide an electronic system for identifying the strokes of an engine which uses only one angular position sensor.
  • the above object is achieved by the present invention in that it relates to an electronic system for identifying the strokes of a four-stroke internal combustion engine
  • the said engine having an output crankshaft coupled to a sensor of the angular position of the said shaft;
  • the said sensor generating a signal having an interval of 360 ° of the crankshaft
  • the said signal having at least one zero reference corresponding to a zero angular reference of the said crankshaft, characterized in that it comprises:
  • the said second electronic means determining at least one specified angular relation between the said zero reference and the angular position in which the upper dead centre of a first cylinder is reached;
  • Figure 1 shows a four-stroke internal combustion engine 2 operating in an Otto cycle, provided with an injection device 4 controlled by an electronic controller 7 operating according to the electronic system of stroke identification according to the present invention.
  • the electronic controller 7 receives a plurality of signals S1, S2, ... Sn of input data collected in the engine 2 (for example, signals proportional to the engine coolant temperature, to the intake air temperature, to the throttle position, etc.) and generates at the output a plurality of injection times Tj supplied to the injection device 4.
  • a plurality of signals S1, S2, ... Sn of input data collected in the engine 2 for example, signals proportional to the engine coolant temperature, to the intake air temperature, to the throttle position, etc.
  • the injection device 4 is provided with four injectors 4a, 4b, 4c, 4d operating with corresponding first, second, third and fourth cylinders 9a, 9b, 9c, 9d (shown schematically) of the engine 2 ("Multipoint" system) and can inject the fuel into one cylinder at a time (sequential system) and in the suction stroke (timed system).
  • injectors 4a, 4b, 4c, 4d operating with corresponding first, second, third and fourth cylinders 9a, 9b, 9c, 9d (shown schematically) of the engine 2 ("Multipoint" system) and can inject the fuel into one cylinder at a time (sequential system) and in the suction stroke (timed system).
  • the electronic controller 7 is provided with an engine stroke reference unit 11 permitting recognition of the engine stroke (suction, compression, expansion, exhaust) in each cylinder 9a, 9b, 9c, 9d of the engine 2.
  • the reference unit 11 receives at its input a signal from a sensor 15 coupled to a toothed pulley 17 mounted on one end of the crankshaft 20 of the engine 2.
  • the sensor 15 can generate an electrical pulse when one tooth of the pulley 17 passes in front of the sensor 15.
  • the toothed pulley 17 is keyed to one end 20a of the shaft 20 close to the cylinder 9a.
  • the cylinder 9d is also close to one end 20b of the shaft 20 opposite the end 20a.
  • the toothed pulley 17 is provided with sixty teeth, with the omission of two, and therefore has a flattened portion formed by the absence of these two teeth, which is used as the zero reference.
  • the zero reference is used to identify the upper dead centres of the different cylinders of the engine.
  • the upper dead centre of each cylinder 4a, 4b, 4c, 4d is found, with an angular indeterminacy of 3600, in a specified angular position aa, ab, ac, ad with respect to the zero reference.
  • the signal R generated by the sensor 15 consists of a sequence of pulses Di equally spaced by an interval t.
  • the signal R also has a flat portion Dz of width T (equal to approximately three times t) in which pulses cannot be detected; this flat portion Dz is produced during the passage of the flattened portion in front of the sensor 15.
  • the upper dead centre of each cylinder is identified with the said indeterminacy of 360 ° by counting a specified number of pulses Na, Nb, Nc, Nd after the detection of the zero reference.
  • the reference unit 11 also interacts with a device 25, for example the device described in French Patent FR-9111273 with the title "Process and device for measuring the torque of an internal combustion engine", capable of measuring the instantaneous torque developed individually by the different cylinders of the engine 2.
  • the unit 11 generates at its output a signal which describes the engine strokes (suction, compression, expansion, exhaust) of each cylinder 9a, 9b, 9c, 9d of the engine 2.
  • the first block encountered is the block 100 in which the system detects the signal R generated by the sensor 15.
  • the system is prepared to await the flat portion Dz of the signal R in order to identify the zero reference of the pulley 17.
  • Detection of the zero reference results in a passage from the block 100 to a block 110.
  • the block 110 arbitrarily assigns the strokes of the engine 2, assigning, for example, the upper dead centre of the first cylinder 9a to the first specified angular position following the zero reference; the assignation of the positions of the upper dead centres of the other cylinders is carried out in a way compatible with the first assignation.
  • the angular position aa of the upper dead centre of the first cylinder 9a is assigned after the detection of a specified number (for example, twenty) of pulses Na following the zero reference.
  • the angular position found on the twentieth pulse following the zero reference may also correspond to the upper dead centre of the fourth cylinder 9d.
  • the block 110 is followed by a block 130 which detects an error in the assignation of the strokes (mistiming by 3600) and consequently retimes the injection.
  • the block 130 comprises a block 131 in which the instantaneous torque supplied by one cylinder of the engine, for example the cylinder recognized by the block 110 as the first cylinder 9a, is monitored by the device 25.
  • This cylinder 9a is physically close to the pulley 17.
  • the letter A indicates a curve which represents the variation with time of the torque supplied by the cylinder recognized as the first cylinder 9a; the variation of this torque has an approximately sinusoidal form.
  • the block 131 is followed by a block 132 in which is stored the signal expressing the variation with time of the torque supplied by the cylinder recognized as the first cylinder 9a.
  • the block 132 is followed by a block 133 in which the instantaneous torque supplied by another cylinder of the engine, in particular the cylinder at the greatest distance along the shaft 20 from the first cylinder 9a, is monitored.
  • the block 133 may conveniently measure the instantaneous torque supplied by the cylinder recognized by the block 110 as the fourth cylinder 9d; the first cylinder 9a and the fourth cylinder 9d are coupled to opposite portions of the shaft 20.
  • the torque supplied by the fourth cylinder 9d is also displaced by 360 ° of the crankshaft from the torque supplied by the first cylinder 9a.
  • the letter B indicates a curve representing the variation with time of the torque supplied by the cylinder recognized as 9d; the variation of this torque is approximately sinusoidal.
  • the displacement of 360 between the torques of cylinders 9a and 9d is also eliminated.
  • the block 133 is followed by a block 134 in which the torque measured in the block 131 is compared with the torque measured by the block 133; for this purpose, since the torque measured in the block 133 is displaced angularly and in time from the torque measured in the block 131, a time correction is made to the torque stored in the block 132.
  • the stored torque (curve A) is displaced by 360 ° in such a way that the torques supplied by the first and fourth cylinders 9a, 9d can be compared, and these torques can be considered as if supplied simultaneously.
  • the torques supplied by the first and fourth cylinders 9a, 9d should have substantially equal variations in time, and the curves A and B should therefore coincide.
  • the block 134 calculates the times t1 and t2 taken by the torques represented by the curves A and B to reach a specified threshold value C threshold ( Figure 3).
  • the block 134 is followed by a block 135 in which the times t1 and t2 are compared with each other; in particular, if the time t1 is less than t2 (with the torque generated by the cylinder recognized as the first cylinder 9a in advance of the torque generated by the cylinder recognized as the fourth cylinder 9d) the block 135 is followed by a block 136; otherwise (if the time t1 is greater than t2 and therefore the torque generated by the cylinder recognized as the first cylinder 9a lags behind the torque generated by the cylinder recognized as 9d) the block 135 is followed by a block 137.
  • the block 137 retimes by 360 the timing set in the block 110; consequently, the upper dead centre of the fourth cylinder 9d (whose position is displaced by 360 with respect to that of the first cylinder) is assigned to the first angular position of the shaft 20 following the detection of a specified number of pulses (for example, twenty) from the zero reference.
  • the block 136 maintains the timing determined by the block 110.
  • the blocks 136 and 137 lead to the exit from the program.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Transmission Devices (AREA)
  • Hybrid Electric Vehicles (AREA)
EP95107844A 1994-05-23 1995-05-22 Système électronique d'identification des cycles pour moteurs à combustion interne Expired - Lifetime EP0684376B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT94BO000239A ITBO940239A1 (it) 1994-05-23 1994-05-23 Sistema elettronico per l'identificazione delle fasi di un motore endotermico.
ITBO940239 1994-05-23

Publications (2)

Publication Number Publication Date
EP0684376A1 true EP0684376A1 (fr) 1995-11-29
EP0684376B1 EP0684376B1 (fr) 1998-08-12

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EP95107844A Expired - Lifetime EP0684376B1 (fr) 1994-05-23 1995-05-22 Système électronique d'identification des cycles pour moteurs à combustion interne

Country Status (4)

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EP (1) EP0684376B1 (fr)
DE (1) DE69503971T2 (fr)
ES (1) ES2121259T3 (fr)
IT (1) ITBO940239A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996041938A1 (fr) * 1995-06-10 1996-12-27 Robert Bosch Gmbh Dispositif d'identification de cylindre dans un moteur a combustion interne multi-cylindre
US5758625A (en) * 1996-12-03 1998-06-02 C.R.F. S.C.P.A. Method of synchronizing an internal-combustion engine without a cam position sensor
WO1999002838A1 (fr) * 1997-07-08 1999-01-21 Scania Cv Aktiebolag Procede et dispositif destines au demarrage d'un moteur a injection a quatre temps
FR2925593A1 (fr) * 2007-12-20 2009-06-26 Renault Sas Procede pour produire un signal de synchronisation du cycle de fonctionnement d'un moteur a combustion interne

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10122154B4 (de) * 2001-05-08 2014-11-20 Bayerische Motoren Werke Aktiengesellschaft Verfahren und Vorrichtung zur Erkennung der Laufunruhe bei Vier-Takt-Verbrennungsmotoren

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4870587A (en) * 1986-11-28 1989-09-26 Honda Giken Kogyo Kabushiki Kaisha Method of discriminating a stroke of a 4-cycle internal combustion engine
FR2676251A1 (fr) * 1991-05-07 1992-11-13 Bosch Gmbh Robert Procede et dispositif pour la detection du temps de travail d'un moteur a quatre temps.
EP0532419A1 (fr) * 1991-09-12 1993-03-17 Regie Nationale Des Usines Renault S.A. Procédé et dispositif de mesure du couple d'un moteur thermique à combustion interne
EP0576334A1 (fr) * 1992-06-23 1993-12-29 Regie Nationale Des Usines Renault S.A. Procédé de repérage cylindres pour le pilotage d'un système d'injection électronique d'un moteur à combustion interne

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4870587A (en) * 1986-11-28 1989-09-26 Honda Giken Kogyo Kabushiki Kaisha Method of discriminating a stroke of a 4-cycle internal combustion engine
FR2676251A1 (fr) * 1991-05-07 1992-11-13 Bosch Gmbh Robert Procede et dispositif pour la detection du temps de travail d'un moteur a quatre temps.
EP0532419A1 (fr) * 1991-09-12 1993-03-17 Regie Nationale Des Usines Renault S.A. Procédé et dispositif de mesure du couple d'un moteur thermique à combustion interne
EP0576334A1 (fr) * 1992-06-23 1993-12-29 Regie Nationale Des Usines Renault S.A. Procédé de repérage cylindres pour le pilotage d'un système d'injection électronique d'un moteur à combustion interne

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996041938A1 (fr) * 1995-06-10 1996-12-27 Robert Bosch Gmbh Dispositif d'identification de cylindre dans un moteur a combustion interne multi-cylindre
US5823166A (en) * 1995-06-10 1998-10-20 Robert Bosch Gmbh Apparatus for monitoring the cylinders of a multi-cylinder internal combustion engine
US5758625A (en) * 1996-12-03 1998-06-02 C.R.F. S.C.P.A. Method of synchronizing an internal-combustion engine without a cam position sensor
EP0846852A1 (fr) * 1996-12-03 1998-06-10 C.R.F. Società Consortile per Azioni Méthode de synchronisation d'un moteur à combustion sans détecteur de position d'arbre à came
WO1999002838A1 (fr) * 1997-07-08 1999-01-21 Scania Cv Aktiebolag Procede et dispositif destines au demarrage d'un moteur a injection a quatre temps
FR2925593A1 (fr) * 2007-12-20 2009-06-26 Renault Sas Procede pour produire un signal de synchronisation du cycle de fonctionnement d'un moteur a combustion interne
WO2009083492A1 (fr) * 2007-12-20 2009-07-09 Renault S.A.S. Procede pour produire un signal de synchronisation du cycle de fonctionnement d'un moteur a combustion interne
CN101952579A (zh) * 2007-12-20 2011-01-19 雷诺股份公司 用于生成内燃发动机运行循环同步信号的方法
CN101952579B (zh) * 2007-12-20 2013-06-19 雷诺股份公司 用于生成内燃发动机运行循环同步信号的方法

Also Published As

Publication number Publication date
DE69503971D1 (de) 1998-09-17
ITBO940239A0 (it) 1994-05-23
EP0684376B1 (fr) 1998-08-12
ES2121259T3 (es) 1998-11-16
DE69503971T2 (de) 1999-01-14
ITBO940239A1 (it) 1995-11-23

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