EP0852667B1 - Procede de determination de la richesse optimale d'un melange air/carburant alimentant un moteur a combustion interne et dispositif correspondant - Google Patents

Procede de determination de la richesse optimale d'un melange air/carburant alimentant un moteur a combustion interne et dispositif correspondant Download PDF

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Publication number
EP0852667B1
EP0852667B1 EP96928434A EP96928434A EP0852667B1 EP 0852667 B1 EP0852667 B1 EP 0852667B1 EP 96928434 A EP96928434 A EP 96928434A EP 96928434 A EP96928434 A EP 96928434A EP 0852667 B1 EP0852667 B1 EP 0852667B1
Authority
EP
European Patent Office
Prior art keywords
engine
mixture
richness
throttle valve
initial
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 - Lifetime
Application number
EP96928434A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0852667A1 (fr
Inventor
Alain Aubourg
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.)
Continental Automotive France SAS
Original Assignee
Siemens Automotive SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siemens Automotive SA filed Critical Siemens Automotive SA
Publication of EP0852667A1 publication Critical patent/EP0852667A1/fr
Application granted granted Critical
Publication of EP0852667B1 publication Critical patent/EP0852667B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
    • F02D41/1406—Introducing closed-loop corrections characterised by the control or regulation method with use of a optimisation method, e.g. iteration
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D31/00—Use of speed-sensing governors to control combustion engines, not otherwise provided for
    • F02D31/001—Electric control of rotation speed
    • F02D31/002—Electric control of rotation speed controlling air supply
    • F02D31/003—Electric control of rotation speed controlling air supply for idle speed control
    • F02D31/005—Electric control of rotation speed controlling air supply for idle speed control by controlling a throttle by-pass
    • 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
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
    • F02D41/1408—Dithering techniques
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D11/00—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated
    • F02D11/06—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance
    • F02D11/10—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance of the electric type
    • F02D2011/101—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance of the electric type characterised by the means for actuating the throttles
    • F02D2011/102—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance of the electric type characterised by the means for actuating the throttles at least one throttle being moved only by an electric actuator

Definitions

  • the present invention relates to a method for determining the optimal richness of an air / fuel mixture feeding a combustion engine internal and a corresponding device. More particularly, this device is intended to equip motors of the type used in pumps, generator sets, lawn mowers etc ...
  • the object of the invention is therefore to create a method and a device adapted to vary the richness of a mixture feeding a motor to internal combustion equipped with a speed regulator, in a simple and economical by using as few specific sensors as possible, in order to to determine what is the optimal wealth value of this engine.
  • the determination of the optimal richness is carried out at least at each startup and is then applied for the duration of engine operation. This determination can also be made after each significant change in the resistive torque of the motor.
  • the present invention also relates to a device according to claim 7, putting in implements the process described above.
  • the motor 10 comprises a single cylinder 11 (as is generally the case for the small engines in question) receiving an air / fuel mixture in from a carburetor 12.
  • This carburetor of the conventional type, is supplied on the one hand in air via an air filter 13, and on the other hand in fuel via a fuel tank 14, fitted with a flow actuator 15 delivering the fuel inside the carburetor.
  • the motor according to the invention is also provided with a regulator of speed 16, of known type, compensating for variations in rotation speed of the engine by acting on the position of a throttle valve 17 for admitting the mixture.
  • the engine according to the invention further comprises a sensor 18 adapted to determine the position of the butterfly.
  • This sensor is for example a simple potentiometer.
  • the position sensor 18, the fuel flow actuator 15 and the engine 10 are also connected to a computer 19, implementing the method for determining the optimum richness according to the present invention.
  • the motor 10 is firstly put into operation.
  • the carburetor 12 mixes, on the one hand, in a predetermined manner the fuel from the tank 14 supplied by the flow actuator 15 and other part, the air having passed through the filter 13.
  • the engine in on cruise control 16 acts on the throttle position to maintain constant engine speed. Indeed by varying the opening angle of the throttle causes variations in the engine torque and therefore variations in the diet.
  • the operation of such a motor fitted with a cruise control is known per se and will not be detailed here.
  • the computer 19 when the engine is running, and preferably shortly after starting, the computer 19 causes a plurality of wealth jumps S1 ( Figure 2). Preferably we cause three jumps of consecutive wealth. In general we start by increasing the richness r of mixture feeding the engine. The position sensor 18 then measures the variations in the position of the butterfly caused by these jumps in wealth.
  • a new series of wealth jumps is then ordered by the calculator.
  • the variations of the position of the butterfly created by this new series wealth jumps are then very small. Indeed when the engine is at its optimum torque, variations in richness do not significantly cause diet variations.
  • the mean of the butterfly position variations during this new series of jumps, is then below a minimum threshold of variation. In this case the engine is at its optimal torque and the richness of the mixing is also optimal.
  • maps are carried out from a typical engine. These maps give according to wealth initial mixing, the correction to be applied according to the average of the variations of butterfly position measured. So we memorize a first table giving for each average angle of opening of the butterfly before application of the jumps of richness and for each variation of throttle position after application of jump richness, the value of the correction to be applied to the mixture when the mixture initial is too poor, and a second table giving, similarly, the value of the correction to be applied to the mixture when the initial mixture is too rich.
  • the correction to be made is a decrease in the amount of fuel supplied to the carburetor, and when the initial mixture is too lean it is an increase in the amount of fuel to be injected which should be carried out.
  • this amplitude is greater than a determined threshold experimentally on a typical engine, a correction is to be applied. On the other hand if this amplitude is below this threshold, the engine operates at richness optimal and no correction is to be applied.
  • the computer may very well carry out the calculations required, for each series of wealth jumps, to determine the correction to be applied.
  • the plurality of wealth jumps is made in injecting quantities of fuel different from the initial quantities supplying engine.
  • FIG 3 shows an engine not only equipped with a regulator speed 16, but also an injection system 15 '.
  • a regulator speed 16 there is no carburetor and the throttle is simply placed in the manifold engine intake.
  • the carburetor is replaced by the intake manifold in which the mixture of air and fuel is 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)
  • Harvester Elements (AREA)
EP96928434A 1995-09-27 1996-08-08 Procede de determination de la richesse optimale d'un melange air/carburant alimentant un moteur a combustion interne et dispositif correspondant Expired - Lifetime EP0852667B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9511427 1995-09-27
FR9511427A FR2739141B1 (fr) 1995-09-27 1995-09-27 Procede de determination de la richesse optimale d'un melange air / carburant alimentant un moteur a combustion interne et dispositif correspondant
PCT/EP1996/003516 WO1997012135A1 (fr) 1995-09-27 1996-08-08 Procede de determination de la richesse optimale d'un melange air/carburant alimentant un moteur a combustion interne et dispositif correspondant

Publications (2)

Publication Number Publication Date
EP0852667A1 EP0852667A1 (fr) 1998-07-15
EP0852667B1 true EP0852667B1 (fr) 2000-03-22

Family

ID=9483033

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96928434A Expired - Lifetime EP0852667B1 (fr) 1995-09-27 1996-08-08 Procede de determination de la richesse optimale d'un melange air/carburant alimentant un moteur a combustion interne et dispositif correspondant

Country Status (6)

Country Link
US (1) US5992381A (es)
EP (1) EP0852667B1 (es)
DE (1) DE69607362T2 (es)
ES (1) ES2146410T3 (es)
FR (1) FR2739141B1 (es)
WO (1) WO1997012135A1 (es)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7341044B1 (en) * 2007-01-11 2008-03-11 Generac Power Systems, Inc. Method and control device for regulating the air-fuel mixture provided to an engine
CN103392061B (zh) * 2011-02-23 2016-01-20 胡斯华纳有限公司 在切断速度下控制a/f比
EP3656197A1 (en) * 2011-12-28 2020-05-27 Husqvarna Ab Yard maintenance vehicle obstacle avoidance/notification system

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4368707A (en) * 1976-11-22 1983-01-18 Fuel Injection Development Corporation Adaptive charge forming system for controlling the air/fuel mixture supplied to an internal combustion engine
US4393845A (en) * 1978-04-03 1983-07-19 The Bendix Corporation Means for improving the efficiency of an internal combustion engine
JPS57124051A (en) * 1981-01-26 1982-08-02 Nippon Denso Co Ltd Optimum control method of internal combustion engine
JPS582444A (ja) * 1981-06-26 1983-01-08 Nippon Denso Co Ltd 空燃比制御方法
JPS59134343A (ja) * 1983-01-20 1984-08-02 Nippon Denso Co Ltd 空燃比制御方法
DE3439927A1 (de) * 1984-06-30 1986-01-09 Bosch Gmbh Robert Verfahren und vorrichtung zur adaptiven stoergroessenaufschaltung bei reglern
IT1182558B (it) * 1985-09-20 1987-10-05 Weber Spa Sistema di controllo automatico in condizioni di regime di rotazione minimo del tipo della miscela combustibile adotta ad un motore endotermico comorendente un sistema di iniezione elettronica
US4864991A (en) * 1987-12-01 1989-09-12 Snyder Warren E Method and apparatus for controlling air to gas ratio of gaseous fueled engines
JP2864681B2 (ja) * 1990-07-19 1999-03-03 三菱自動車工業株式会社 内燃エンジンの空燃比制御方法
SE9102629L (sv) * 1991-09-11 1993-03-12 Electrolux Ab Anordning i foerbraenningsmotor
SE9302769D0 (sv) * 1993-08-27 1993-08-27 Electrolux Ab Motorstyrning

Also Published As

Publication number Publication date
FR2739141A1 (fr) 1997-03-28
ES2146410T3 (es) 2000-08-01
DE69607362T2 (de) 2001-10-31
DE69607362D1 (de) 2000-04-27
FR2739141B1 (fr) 1997-12-05
WO1997012135A1 (fr) 1997-04-03
EP0852667A1 (fr) 1998-07-15
US5992381A (en) 1999-11-30

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