EP0489864B1 - Procede de fonctionnement d'un moteur a combustion interne - Google Patents

Procede de fonctionnement d'un moteur a combustion interne Download PDF

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Publication number
EP0489864B1
EP0489864B1 EP90914396A EP90914396A EP0489864B1 EP 0489864 B1 EP0489864 B1 EP 0489864B1 EP 90914396 A EP90914396 A EP 90914396A EP 90914396 A EP90914396 A EP 90914396A EP 0489864 B1 EP0489864 B1 EP 0489864B1
Authority
EP
European Patent Office
Prior art keywords
mixture
combustion engine
internal combustion
control
probe
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
EP90914396A
Other languages
German (de)
English (en)
Other versions
EP0489864A1 (fr
Inventor
Hellmut Dipl.-Ing. Freudenberg
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.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
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 AG, Siemens Corp filed Critical Siemens AG
Publication of EP0489864A1 publication Critical patent/EP0489864A1/fr
Application granted granted Critical
Publication of EP0489864B1 publication Critical patent/EP0489864B1/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
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1486—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor with correction for particular operating 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
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/06—Introducing corrections for particular operating conditions for engine starting or warming up
    • F02D41/068—Introducing corrections for particular operating conditions for engine starting or warming up for warming-up
    • 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
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1486—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor with correction for particular operating conditions
    • F02D41/1488—Inhibiting the regulation
    • 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
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
    • F02D41/1454—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an oxygen content or concentration or the air-fuel ratio
    • F02D41/1456—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an oxygen content or concentration or the air-fuel ratio with sensor output signal being linear or quasi-linear with the concentration of oxygen

Definitions

  • the invention relates to a method for operating an internal combustion engine according to the preamble of claim 1.
  • a customary ⁇ control regulates the mixture of fuel and air to be supplied to an internal combustion engine to a stoichiometric ratio. During special operating conditions that require a rich mixture, the ⁇ control must therefore be switched off and a controller takes over its task.
  • a mixture control system for an internal combustion engine with a ⁇ control is known, the ⁇ probe providing a linear output signal.
  • a temperature-dependent control of a choke valve takes place before the ⁇ probe is ready for operation. A occurs during the warm-up phase of the machine and after the operating temperature of the ⁇ probe has been reached ⁇ control roughly via the choke valve and fine via a bypass valve.
  • a ⁇ probe with a linear characteristic ensures that a fuel-air mixture can be regulated in a range from lean to rich even in the warm-up phase of the internal combustion engine.
  • the object of the invention is to improve the mixture control during such special operating states of the machine.
  • the solution according to the invention consists in switching on the ⁇ control even during control operation with a limited control range.
  • the control range of the ⁇ regulator is therefore limited so that it regulates only in the rich direction and not in the lean direction.
  • the ⁇ control does not apply to a rich mixture. However, if the control incorrectly sets a lean mixture, the ⁇ control can intervene in the enriching direction and thus reduce the error to an acceptable level.
  • the ⁇ controller with the limited control range is therefore switched on when the internal combustion engine is started, when the probe operating temperature of the ⁇ probe is reached, that is to say immediately when the ⁇ control itself is ready for operation. Only when a minimum cooling water temperature is reached, which indicates the end of warm-up, at which the machine no longer needs a rich mixture, will the control range be released without restriction in the direction of rich and lean.
  • acceleration mode special operating conditions that require a rich mixture are acceleration mode and full load mode.
  • the probe operating temperature of the ⁇ probe has already been reached and therefore the ⁇ control with a limited control range can be switched on during the entire acceleration or full-load operation.
  • the air ratio ⁇ is plotted against the cooling water temperature TKW.
  • TKW cooling water temperature
  • the machine is in the warm-up phase until a minimum cooling water temperature TKWM is reached.
  • a rich mixture is set at the start depending on the level of the cooling water temperature TKW.
  • this initially set mixture is then controlled to the stoichiometric mixture ratio until the minimum cooling water temperature TKWM is reached.
  • Such an ideal mixture flow is shown in FIG. 1 with the solid line.
  • the ⁇ control then regulates a stoichiometric mixture ratio, which in turn is idealized in FIG. 1.
  • Two dashed lines run parallel to the ideal mixture curve during the warm-up phase, which illustrate the fluctuation range of the mixture values set by a real controller.
  • a mixture course according to the lower line means an enrichment going beyond the required level and the upper line an insufficient enrichment.
  • the mixture progression according to the upper line there are even mixture values towards the end of the warm-up phase which are above the stoichiometric ratio in the lean direction. However, this is undesirable, especially during the warm-up phase, since the smooth running of the machine can then no longer be guaranteed.
  • Such a lean mixture is reliably prevented by the method according to the invention during the warm-up phase. Because, in addition to the control system, the ⁇ control is only switched on for the control in the bold direction, all mixture values set by the control system which are above the stoichiometric ratio are adjusted back to the stoichiometric ratio. Mixture values lying in the area of the triangle hatched in FIG. 1 are therefore not possible. As long as the control system sets mixture values below the stoichiometric ratio in the rich direction, the ⁇ control cannot intervene, since the control system is blocked in the lean direction.
  • FIG. 2. 1 denotes a ⁇ controller, 3 a logic device and 4 a controller.
  • the functions of these three devices are carried out by a microcomputer MC with appropriate programming.
  • the microcomputer MC receives the signals for an air ratio ⁇ from a ⁇ probe 2, a cooling water temperature TKW from a temperature sensor 5, a speed n from a speed sensor 6 and an air mass LM from an air mass meter 7.
  • An output of the microcomputer MC is connected to injectors 8 with appropriate control. The amount of fuel injected, and thus the mixture ratio, is determined via the opening time of the individual injection valves controlled by this.
  • the control 4 receives the cooling water temperature TKW, the speed n and the air mass LM as input variables.
  • the control 4 determines the fuel quantity to be injected from a characteristic map via the speed n and the air mass LM, that is to say the load on the machine.
  • Another map contains an additional amount of fuel required for a cold start depending on the cooling water temperature TKW. This enrichment, which is brought about in the event of a cold start, is then carried out in accordance with that in FIG function shown until the end of the warm-up phase.
  • the ⁇ controller 1 receives the air ratio ⁇ as an input variable and uses it to determine fuel injection values that correspond to a stoichiometric mixture ratio.
  • the output signals of the controller 4 and the ⁇ controller 1 are fed to a logic device 3. This selects the one of the two output signals that is passed on to the injection valves 8.
  • the air ratio ⁇ and the cooling water temperature TKW are supplied to the logic device 3.
  • the selection is explained on the basis of the flow chart of FIG. 3.
  • step S1 the logic device 3 checks whether the probe temperature TS of the ⁇ probe 2 is greater than / equal to the probe operating temperature TSB.
  • This probe temperature TS is calculated via the voltage level of the output signal of the ⁇ probe 2 representing the air ratio ⁇ .
  • the probe temperature TS could of course also be obtained from the output signal of a temperature sensor assigned to the ⁇ probe 2.
  • step S1 If the answer in step S1 is no, the ⁇ probe 2 is not yet ready for operation and the logic device 3 calls a program block "control" which represents the function of the control 4.
  • step S2 follows. It is checked whether the cooling water temperature TKW is greater than or equal to the minimum cooling water temperature TKM.
  • the logic device 3 accordingly calls a program block "control and ⁇ regulation"
  • This program block contains the functions of the controller 4 and the ⁇ controller 1, the function of the ⁇ controller 1 being carried out only in the greasing direction.
  • the ⁇ controller is therefore only active if the controller produces mixture values would lie above the stoichiometric ratio in the lean direction In this case, the function corresponding to the ⁇ controller 1 is activated so that the set mixture values do not exceed the stoichiometric ratio.
  • step S2 After the warm-up phase has ended, the answer in step S2 is yes, since the minimum cooling water temperature TKWM has been reached. Then follows a program block " ⁇ control" which performs the usual function of a ⁇ control.

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)

Abstract

Dans des conditions de fonctionnement spéciales comme, par exemple, fonctionnement à chaud, accélération, pleine charge, le réglage du mélange est, comme on le sait, entrepris par une commande automatique à la place d'un réglage du μ. Ceci peut conduire à un mélange pauvre. Selon l'invention, on évitera que le réglage en μ reste connecté avec une plage de réglage réduite, en fonctionnement spécial. Il est superposé au préréglage automatique et n'agit que dans le sens mélange riche.

Claims (4)

  1. Procédé pour faire fonctionner un moteur à combustion interne comportant une sonde de λ (2) et un régulateur de λ (1), qui, en fonction du signal de sortie de la sonde de λ (2), règle le mélange, qui doit être envoyé au moteur à combustion interne et qui est formé de carburant et d'air, à une valeur de consigne, lors du fonctionnement régulier, et
    une unité de commande (4), qui, pendant des états de fonctionnement particuliers, règle le mélange carburant-air à une valeur moyenne, qui, du côté riche, est. inférieure à la valeur de consigne que règle le régulateur de λ (1) en dehors des états de fonctionnement particuliers,
    caractérisé par le fait que le régulateur de λ (1) agit de façon dissymétrique pendant les états de fonctionnement particuliers de sorte qu'il règle le mélange uniquement en direction du côté riche.
  2. Procédé suivant la revendication 1, caractérisé par le fait que l'état de fonctionnement particulier est le fonctionnement à chaud du moteur à combustion interne,
    qu'après le démarrage du moteur à combustion interne et lorsqu'une température de fonctionnement particulier (TSB) est atteinte, le régulateur de λ (1) est branché, avec la gamme de réglage limitée, et
    que la gamme de réglage est libérée d'une manière illimitée seulement lorsqu'une température minimale (TKWM) de l'eau de refroidissement est atteinte.
  3. Procédé suivant la revendication 1, caractérisé par le fait que l'état de fonctionnement particulier est le fonctionnement d'accélération du moteur à combustion interne.
  4. Procédé suivant la revendication 1, caractérisé par le fait que l'état de fonctionnement particulier est le fonctionnement à pleine charge du moteur à combustion interne.
EP90914396A 1989-10-05 1990-09-26 Procede de fonctionnement d'un moteur a combustion interne Expired - Lifetime EP0489864B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP89118488 1989-10-05
EP89118488 1989-10-05

Publications (2)

Publication Number Publication Date
EP0489864A1 EP0489864A1 (fr) 1992-06-17
EP0489864B1 true EP0489864B1 (fr) 1993-11-18

Family

ID=8201981

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90914396A Expired - Lifetime EP0489864B1 (fr) 1989-10-05 1990-09-26 Procede de fonctionnement d'un moteur a combustion interne

Country Status (5)

Country Link
US (1) US5279275A (fr)
EP (1) EP0489864B1 (fr)
DE (1) DE59003560D1 (fr)
ES (1) ES2046796T3 (fr)
WO (1) WO1991005153A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19501458B4 (de) * 1995-01-19 2009-08-27 Robert Bosch Gmbh Verfahren zur Adaption der Warmlaufanreicherung

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2778383B2 (ja) * 1992-10-02 1998-07-23 日産自動車株式会社 エンジンの空燃比制御装置
EP0593800B1 (fr) * 1992-10-19 1995-12-27 Siemens Aktiengesellschaft Méthode pour l'exploitation d'un moteur à combustion interne à pleine charge
DE19955649C2 (de) * 1999-11-19 2002-01-10 Bosch Gmbh Robert Elektronische Motorsteuerung einer Brennkraftmaschine
DE10307004B3 (de) * 2003-02-19 2004-08-05 Siemens Ag Verfahren zur Steuerung einer Brennkraftmaschine mit einer Lambda-Regelung

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1518763A (en) * 1975-03-07 1978-07-26 Nissan Motor Closed loop air fuel ratio control system using exhaust composition sensor
JPS51144828A (en) * 1975-06-09 1976-12-13 Nissan Motor Co Ltd Synthetic exhaust countermeasure system for internal combustion engine
JPS5926781B2 (ja) * 1975-11-25 1984-06-30 株式会社デンソー クウネンヒキカンシキコンゴウキセイギヨソウチ
JPS5916090B2 (ja) * 1976-06-18 1984-04-13 株式会社デンソー 空燃比帰還式混合気制御装置
JPS58104336A (ja) * 1981-12-16 1983-06-21 Toyota Motor Corp 電子制御燃料噴射式内燃機関の暖機加速増量方法
JPS6069242A (ja) * 1983-09-26 1985-04-19 Nippon Carbureter Co Ltd 内燃機関の空燃比制御方法
JPS60206953A (ja) * 1984-03-30 1985-10-18 Toyota Motor Corp 内燃機関の空燃比制御装置
JPS63167061A (ja) * 1986-12-27 1988-07-11 Honda Motor Co Ltd 内燃エンジンの空燃比制御装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19501458B4 (de) * 1995-01-19 2009-08-27 Robert Bosch Gmbh Verfahren zur Adaption der Warmlaufanreicherung

Also Published As

Publication number Publication date
US5279275A (en) 1994-01-18
WO1991005153A1 (fr) 1991-04-18
DE59003560D1 (de) 1993-12-23
EP0489864A1 (fr) 1992-06-17
ES2046796T3 (es) 1994-02-01

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