EP0414684A1 - Systeme de commande et de reglage de moteurs a combustion interne. - Google Patents

Systeme de commande et de reglage de moteurs a combustion interne.

Info

Publication number
EP0414684A1
EP0414684A1 EP88909290A EP88909290A EP0414684A1 EP 0414684 A1 EP0414684 A1 EP 0414684A1 EP 88909290 A EP88909290 A EP 88909290A EP 88909290 A EP88909290 A EP 88909290A EP 0414684 A1 EP0414684 A1 EP 0414684A1
Authority
EP
European Patent Office
Prior art keywords
memory
air ratio
internal combustion
setpoint
combustion engine
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
EP88909290A
Other languages
German (de)
English (en)
Other versions
EP0414684B1 (fr
Inventor
Eberhard Schnaibel
Erich Schneider
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0414684A1 publication Critical patent/EP0414684A1/fr
Application granted granted Critical
Publication of EP0414684B1 publication Critical patent/EP0414684B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • 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
    • F02D41/2496—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories the memory being part of a closed loop
    • 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
    • F02D41/1402—Adaptive control
    • 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

Definitions

  • the invention relates to a control system for adjusting the air / fuel mixture of an internal combustion engine
  • Such systems have a ⁇ probe which is exposed to the exhaust gas of the internal combustion engine and which emits an output signal which represents a measure of the air ratio ⁇ .
  • the control system also has a basic memory, a setpoint memory and a control device. Fuel metering times (e.g. injection times for the injection valves of the internal combustion engine) are stored in the basic memory as a function of operating parameters of the internal combustion engine, and setpoint values for the air ratio ⁇ are stored in the setpoint value memory as a function of operating parameters of the internal combustion engine.
  • the control device corrects the fuel metering time read from the basic memory as a function of a respectively measured output signal of the ⁇ probe and an assigned target value read from the target value memory.
  • Low-emission vehicles are usually operated with a three-way catalytic converter arranged in the exhaust gas of the internal combustion engine.
  • the invention has for its object to improve a control system for adjusting the air / fuel mixture, in particular for regulation in the lean area.
  • the control system is characterized in that the setpoint memory stores the reciprocal of the air number ⁇ and, depending on the operating parameters of the internal combustion engine, the fuel metering time read out from the basic memory for piloting the internal combustion engine to a predetermined air number ⁇ with the assigned readout from the setpoint memory Reciprocal of the air ratio ⁇ for obtaining a fuel metering time adapted to a change in the predetermined air ratio ⁇ is multiplicatively linked.
  • a pre-control is superimposed on a ⁇ control.
  • the control system according to the invention has a conversion device which, with the aid of an at least approximately known characteristic characteristic relationship between the output signal of the ⁇ probe and the air ratio ⁇ , converts the output signal into a corresponding reciprocal value of the air ratio ⁇ , and the control device of the control system according to the invention / Control system is fed a control deviation, which is based on the difference of in speed of operating characteristics of the internal combustion engine from the setpoint memory, reciprocal values of the air ratio ⁇ and the associated reciprocal values of the air ratio determined by the conversion unit on the basis of the output signal of the ⁇ probe are determined as actual values.
  • the control system according to the invention has the advantage that, for example in the case of control in the lean range ( ⁇ ⁇ 0.9 to 1.4), only one control device is required in the entire range and additional complex circuitry measures are avoided.
  • the known control systems regulate the air ratio ⁇ and change the fuel metering time in proportion to the control deviation. In reality, however, there is no! linear relationship between the air ratio ⁇ and the amount of fuel added.
  • the air ratio ⁇ is proportional to the reciprocal of the fuel quantity or, conversely, the amount of fuel added is proportional to the reciprocal of the air ratio ⁇ .
  • the control system according to the invention has the advantage that the control in the entire ⁇ range to be controlled is linear, since the conversion device supplies the reciprocal value of the air ratio ⁇ to the control device and that the output signals of the ⁇ probe are not used directly for control, as is customary become. Regardless of the level of the respective setpoint, a certain percentage control deviation corresponds to the setpoint of the same manipulated variable, so that the gain of the controller can be selected independently of the setpoint.
  • the memories basic memory, setpoint memory
  • the control device and the conversion unit are functional units of a microcomputer. It is particularly advantageous to store the fuel metering times, the setpoints of the air ratio ⁇ and the characteristic relationship between the output signal of the ⁇ probe and the air ratio ⁇ in maps that are addressed by means of the operating parameters of the internal combustion engine.
  • FIG. 1 shows a block diagram of an embodiment of a control system that regulates fuel injection times on the basis of 1 / ⁇ values.
  • the control system has a basic memory 10 from which fuel metering times T LKF for piloting an internal combustion engine (BKM) 12 are read out.
  • the speed n and a load parameter L of the internal combustion engine 12 serve as input parameters of the basic memory 10.
  • the throttle valve position of the internal combustion engine, the pressure in the intake manifold of the internal combustion engine or the air mass drawn in by the internal combustion engine can be used as the load parameter.
  • the control system also has a ⁇ probe 14, a conversion unit 16, a sol 1 value memory 18 and a control device 20.
  • the control device 20 has a timer 20.1 and a correction device 20.2. Furthermore, a switchover device 22 and a control release device 24 are present.
  • the target value memory 18, which is addressable like the basic memory 10 via the speed and a load parameter of the internal combustion engine, is divided into three areas, namely in a region in which the reciprocal values of the target air number ⁇ for ⁇ are stored greater than and less than 1, and in which the The target reciprocal of the air ratio ⁇ 1 is stored for control with a catalytic converter and an area in which the target reciprocal values of the air ratio ⁇ are stored for controlling the internal combustion engine 12 in certain operating phases (e.g.
  • the switching device 22 determines the engine temperature T w , the rate of change of a load parameter dL / dt and the information whether a catalyst is present in the exhaust gas of the internal combustion engine and which, on the basis of the variables mentioned, controls the assigned area via a switch 22.1, in which the reciprocal of the air ratio ⁇ is stored as the desired value.
  • the fuel metering times T LKF read from the basic memory 10 are multiplicatively linked to the reciprocal values of the air ratio ⁇ read from the target value memory in accordance with the position of the sight holder 22.1 of the switching device 22, which at the same time represent correction factors (MFK), resulting in the fuel metering time T LKF *. If the internal combustion engine 12 has not yet reached its operating temperature or if the internal combustion engine 12 is in an unsteady phase (acceleration, deceleration), the fuel metering time T LKF * is used to pre-control the Internal combustion engine 12.
  • the control release device 24 closes a switch 24.1 and the fuel metering time T LKF * is multiplied by one of the correction factor FALK outputted to the control device 20, resulting in the fuel metering time T E.
  • the determination of the correction factor FALK is explained in more detail below.
  • the ⁇ probe 14 arranged in the exhaust gas of the internal combustion engine 12 emits an output signal U S , which is fed to a conversion unit 16.
  • the conversion unit 16 uses an at least approximately known probe characteristic relationship between the output signal of the ⁇ probe 14 and the air ratio ⁇ to determine the corresponding reciprocal of the air ratio ⁇ .
  • This current reciprocal of the air ratio ⁇ as the actual value is fed to a comparator 26.
  • the comparator 26 has a corresponding reciprocal of the air ratio ⁇ read from the setpoint memory 18 as the setpoint.
  • the difference between the actual value and the desired value of the air ratio ⁇ is fed to the timing element 20.1 of the control device 20 as a control deviation.
  • the subsequent correction device 20.2 determines the correction factor FALK.
  • a sudden change in the air ratio ⁇ in the event of relatively large deviations of the desired value from the actual value and thus a sudden change in the fuel metering time results in a sudden change in the torque of the internal combustion engine.
  • This jerk is absolutely desirable when accelerating.
  • a jerk is felt to be negative if a sudden change (enlargement) during delay phases the air ratio ⁇ into the lean area.
  • a slowdown from the old 1 / ⁇ setpoint to the new 1 / ⁇ setpoint is carried out by a control unit (27) with a predetermined lowering speed.
  • the lowering speed is selected to change a few percent of the setpoint per second.
  • a filter device to filter out higher-frequency components of the probe signal, which have their cause, for example, in a scattering of the air-fuel mixture from cylinder to cylinder or in other interference signals, in order to "noise" the probe signal to suppress.
  • a lean such a high control speed is not required for control, ie it is not necessary for the control device to work in the vicinity of its stability limit, since the probe signal exhibits constant behavior in the lean range.

Landscapes

  • 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)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

Un système de commande et de réglage sert à ajuster le mélange d'air/carburant d'un moteur à combustion interne (12). Le système comprend une sonde à l'oxygène (sonde lambda) (14) exposée aux gaz d'échappement du moteur (12) qui émet un signal de sortie qui représente une mesure du coefficient d'air lambda. Une mémoire de base (10) enregistre des temps de dosage du carburant qui sont utilisés afin de commander au préalable le moteur (12) jusqu'à obtenir un coefficient prédéterminé d'air lambda. Une mémoire (18) de valeurs de consigne enregistre des valeurs de consigne du coefficient d'air et un agencement de réglage (20) corrige les temps de dosage du carburant lus dans la mémoire de base (10) en fonction du signal de sortie mesuré par la sonde lambda (14) et d'une valeur de consigne correspondante lue dans la mémoire (18) de valeurs de consigne. La valeur réciproque du coefficient d'air lambda est enregistrée dans la mémoire (18) de valeurs de consigne. Chaque temps de dosage du carburant lu dans la mémoire de base (10) est lié par multiplication à la valeur réciproque correspondante du coefficient d'air lambda lue dans la mémoire (18) de valeurs de consigne. Un convertisseur (16) convertit en une valeur réciproque correspondante du coefficient d'air lambda le signal de sortie au moyen d'une relation caractéristique de la sonde et connue au moins approximativement entre le signal de sortie de la sonde lambda (14) et le coefficent d'air lambda. La prise en considération de la relation linéaire entre la valeur réciproque du coefficent d'air lambda et la quantité de carburant (temps de dosage du carburant) permet d'obtenir un réglage rapide et précis au moyen d'un agencement linéaire simple de réglage.
EP19880909290 1987-12-08 1988-11-03 Systeme de commande et de reglage de moteurs a combustion interne Expired - Lifetime EP0414684B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3741527 1987-12-08
DE19873741527 DE3741527A1 (de) 1987-12-08 1987-12-08 Steuer-/regelsystem fuer eine brennkraftmaschine

Publications (2)

Publication Number Publication Date
EP0414684A1 true EP0414684A1 (fr) 1991-03-06
EP0414684B1 EP0414684B1 (fr) 1992-02-12

Family

ID=6342105

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880909290 Expired - Lifetime EP0414684B1 (fr) 1987-12-08 1988-11-03 Systeme de commande et de reglage de moteurs a combustion interne

Country Status (6)

Country Link
US (1) US5040513A (fr)
EP (1) EP0414684B1 (fr)
JP (1) JPH03502952A (fr)
KR (1) KR0121315B1 (fr)
DE (2) DE3741527A1 (fr)
WO (1) WO1989005397A1 (fr)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3839634A1 (de) * 1988-11-24 1990-05-31 Bosch Gmbh Robert Verfahren und vorrichtung zum festlegen mindestens einer schwellspannung bei lambda-eins-regelung
JP3138498B2 (ja) * 1991-06-14 2001-02-26 本田技研工業株式会社 内燃機関の空燃比制御装置
DE69408757T2 (de) * 1993-09-13 1998-06-25 Honda Motor Co Ltd Luft-Kraftstoff-Verhältnis-Erfassungsvorrichtung für eine Brennkraftmaschine
US5427070A (en) * 1994-05-04 1995-06-27 Chrysler Corporation Method of averaging coolant temperature for an internal combustion engine
JPH0814092A (ja) * 1994-06-24 1996-01-16 Sanshin Ind Co Ltd ２サイクルエンジンの燃焼制御装置
US5551410A (en) * 1995-07-26 1996-09-03 Ford Motor Company Engine controller with adaptive fuel compensation
DE19612453C2 (de) * 1996-03-28 1999-11-04 Siemens Ag Verfahren zum Bestimmen der in das Saugrohr oder in den Zylinder einer Brennkraftmaschine einzubringenden Kraftstoffmasse
DE102006053104B4 (de) * 2006-11-10 2019-10-31 Robert Bosch Gmbh Verfahren zur Anpassung eines Kennfeldes
DE102006061682B4 (de) * 2006-12-28 2022-01-27 Robert Bosch Gmbh Verfahren zur Vorsteuerung einer Lambdaregelung
DE102009047646A1 (de) * 2009-12-08 2011-06-09 Robert Bosch Gmbh Verfahren zum Betreiben einer mit einem Gas als Kraftstoff betriebenen Brennkraftmaschine
JP5548114B2 (ja) * 2010-12-24 2014-07-16 川崎重工業株式会社 内燃機関の空燃比制御装置及び空燃比制御方法
DE102011006587A1 (de) * 2011-03-31 2012-10-04 Robert Bosch Gmbh Verfahren zur Adaption eines Kraftstoff-Luft-Gemischs für eine Brennkraftmaschine
FR3065991B1 (fr) * 2017-05-03 2021-03-12 Peugeot Citroen Automobiles Sa Procede de reglage de la consigne de richesse d’une sonde lors d’un balayage d’air

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55125334A (en) * 1979-03-19 1980-09-27 Nissan Motor Co Ltd Fuel controller
DE3231122C2 (de) * 1982-08-21 1994-05-11 Bosch Gmbh Robert Regeleinrichtung für die Gemischzusammensetzung einer Brennkraftmaschine
JPH065047B2 (ja) * 1983-06-07 1994-01-19 日本電装株式会社 空燃比制御装置
JPH0635844B2 (ja) * 1983-06-15 1994-05-11 本田技研工業株式会社 内燃エンジンの燃料供給制御方法
JPH0713493B2 (ja) * 1983-08-24 1995-02-15 株式会社日立製作所 内燃機関の空燃比制御装置
DE3533197A1 (de) * 1985-09-18 1987-03-19 Atlas Fahrzeugtechnik Gmbh Gemischregelung fuer einen verbrennungsmotor
US4763629A (en) * 1986-02-14 1988-08-16 Mazda Motor Corporation Air-fuel ratio control system for engine
GB2194359B (en) * 1986-08-02 1990-08-22 Fuji Heavy Ind Ltd Air-fuel ratio control system for an automotive engine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8905397A1 *

Also Published As

Publication number Publication date
KR900700738A (ko) 1990-08-16
EP0414684B1 (fr) 1992-02-12
DE3868416D1 (fr) 1992-03-26
US5040513A (en) 1991-08-20
JPH03502952A (ja) 1991-07-04
DE3741527A1 (de) 1989-06-22
KR0121315B1 (ko) 1997-11-24
WO1989005397A1 (fr) 1989-06-15

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