EP0757167A2 - Méthode de commande du rapport air/carburant d'un moteur à combustion interne à combustion pauvre - Google Patents

Méthode de commande du rapport air/carburant d'un moteur à combustion interne à combustion pauvre Download PDF

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Publication number
EP0757167A2
EP0757167A2 EP96112294A EP96112294A EP0757167A2 EP 0757167 A2 EP0757167 A2 EP 0757167A2 EP 96112294 A EP96112294 A EP 96112294A EP 96112294 A EP96112294 A EP 96112294A EP 0757167 A2 EP0757167 A2 EP 0757167A2
Authority
EP
European Patent Office
Prior art keywords
air
fuel
value
fuel ratio
ratio
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.)
Withdrawn
Application number
EP96112294A
Other languages
German (de)
English (en)
Other versions
EP0757167A3 (fr
Inventor
Woo-Jik Lee
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.)
Hyundai Motor Co
Original Assignee
Hyundai Motor Co
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 Hyundai Motor Co filed Critical Hyundai Motor Co
Publication of EP0757167A2 publication Critical patent/EP0757167A2/fr
Publication of EP0757167A3 publication Critical patent/EP0757167A3/fr
Withdrawn legal-status Critical Current

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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
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/04—Introducing corrections 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
    • F02D41/14—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
    • F02D41/24—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
    • 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
    • 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
    • F02D41/2441—Methods of calibrating or learning characterised by the learning conditions

Definitions

  • This present invention relates to an air/fuel ratio control method for thin combustion engine vehicles to increase purification efficiency of waste gas and combustion efficiency.
  • the air/fuel ratio (air : fuel) can be controlled to have the value of between the range of 14.5 ⁇ 0.2 : 1 by the fuel combustion ratio control using the ⁇ -sensor(a sensor for calculating the air excess ratio by measuring the amount of air in the waste gas).
  • the thin air/fuel ratio (22 ⁇ 23:1) cannot be measured by a general ⁇ -sensor, and only the relative decision making whether the ratio is thinner or thicker than the theoretical air/fuel ratio(14.5 : 1) is possible.
  • an engine control device generally designated by the reference numeral 1.
  • the engine control device governs an engine 3 and the injector 2 is operated by controlling the injecting amount from the engine control device 1.
  • the feedback control dose not need to be fulfilled, but when a desired air/fuel ratio is not achieved because of the omission of the feedback control, engine operation instability or increasement of NOx discharge amount might be occurred, therefore, it is necessary to amend separately the ratio to approach the desired air/fuel ratio.
  • This present invention gives the solution for the unstability of the engine operation or the increasement of the NOx discharge amount with the desirable air/fuel ratio by applying the preliminary adaption value under the open control condition without the feedback control and because it is possible to use the cheap ⁇ sensor(O 2 sensor) the cost of vehicles will be down.
  • This present invention relates to an air/fuel ratio control method for thin combustion engine vehicles to increase purification efficiency of waste gas and combustion efficiency.
  • the objects of this present invention are in the theoretical air/fuel ratio combustion, to control the air/fuel ratio to be the precise air/fuel ratio by ⁇ -feedback value after making it be the almost desired air/fuel ratio by adaptive precontol of the fuel amount before the feedback control; and to provide an air/fuel ratio control method in order to get near the desired air/fuel ratio by performing the open loop control with only an adaption value which is obtained by the aforesaid procedure.
  • this invention performs as follows : about an air/fuel ratio control method which controls fuel supply of engines by ECU(Electronic Control Unit)s based on the information from the sensors, during the combustion of the theoretical air/fuel ratio, the set-up adaption value is multiplied by the basic injected amount, then after burning the result amount, i. e. fuel injected amount, the amount of oxygen in the waste gas is detected by ⁇ sensor and the feedback control process is repeated; the obtained feedback value will be counted in the adaption value which decides the next injected amount and will constitute the new adaption value by being stored in the ECU's RAM.
  • Fig. 1 represents the flow chart of a general air/fuel ratio control
  • No. 1 is an ECU which controls an engine
  • informations regarding absorption air amount, loads, oxygen amount in waste gas, temperature, inhalation temperature and condition of speed from the sensors are transformed as electric signals and transferred to perceive the condition of the engine and by controlling the fuel injecting value through the air absorption amount and the injector 2 based on the signals from the sensors, vehicles can be driven with the optimal air/fuel ratio.
  • the air/fuel ratio For performing the optimal purification efficiency in the vehicles using three dimensional catalyst, it is always required to set the air/fuel ratio to the theoretical air/fuel ratio under every driving condition, therefore, for controlling the air/fuel ratio, the amount of oxygen in waste gas is measured with a O 2 sensor ( ⁇ -sensor) on an exhaust hole expending from the engine 3 and the air excess rate from the aforesaid oxygen amount is calculated; then the air excess rate will be feedback to govern the amount of the air/fuel ratio, therefore, it is possible to control the desired air/fuel ratio.
  • O 2 sensor ⁇ -sensor
  • An ECU 1 detects the temperature of cooling water with the WTS(Water Temperature Sensor) which is installed in the engine 3's water-out-let part and evaluates whether the temperature is within the possible feedback control range (step A).
  • the adaption value needs to pre-settle the air/fuel ratio, for example the initial value is set by the value 1 and to be counted (step B), then the ECU 1 estimates the theoretical air/fuel ratio(14.5:1) which makes supply ratio of the air supplied to the engine 3 and gasoline burned completely (step C); if it is under the theoretical air/fuel ratio condition, the basic injecting amount of the theoretical air/fuel ratio during the combustion input in the ECU 1 is injected through the injector (step D).
  • the compound air of the theoretical air/fuel ratio is flowed to the engine and burned, and the oxygen amount in the waste gas is measured by the O 2 sensor(step E) through the discharge process .
  • the FBV(Feedback control Value) is decided and is evaluated whether it has the value identical with the initial one(step F).
  • the oxygen amount which is detected from the O 2 sensor will have the value 0, and the FBV will be set with the value 1.
  • the value of FBV is not 1, it means the air is short or excessive, therefore, returning to the step B, the initial value should be recounted under consideration of the air excess, the value in the RAM is stored and controlling the theoretical air/fuel ratio is governed by the new adaption value.
  • the aforesaid adaption value is generally between 0.8 ⁇ 1.2.

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  • 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)
EP96112294A 1995-07-31 1996-07-30 Méthode de commande du rapport air/carburant d'un moteur à combustion interne à combustion pauvre Withdrawn EP0757167A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR9523210 1995-07-31
KR1019950023210A KR100187974B1 (ko) 1995-07-31 1995-07-31 희박 연소 엔진 차량에 있어서의 공연비 제어방법

Publications (2)

Publication Number Publication Date
EP0757167A2 true EP0757167A2 (fr) 1997-02-05
EP0757167A3 EP0757167A3 (fr) 1998-04-08

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Application Number Title Priority Date Filing Date
EP96112294A Withdrawn EP0757167A3 (fr) 1995-07-31 1996-07-30 Méthode de commande du rapport air/carburant d'un moteur à combustion interne à combustion pauvre

Country Status (3)

Country Link
EP (1) EP0757167A3 (fr)
KR (1) KR100187974B1 (fr)
AU (1) AU6080896A (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100435637B1 (ko) * 1997-12-16 2004-09-04 현대자동차주식회사 희박연소엔진을장착한차량에서의공연비제어방법
KR100422619B1 (ko) * 1997-12-31 2004-06-16 현대자동차주식회사 연료 분사 제어방법

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4445481A (en) * 1980-12-23 1984-05-01 Toyota Jidosha Kogyo Kabushiki Kaisha Method for controlling the air-fuel ratio of an internal combustion engine
US4669439A (en) * 1984-09-10 1987-06-02 Mazda Motor Corporation Air-to-fuel ratio control systems for internal combustion engines
US4677559A (en) * 1984-01-30 1987-06-30 U.S. Philips Corporation Control arrangement for a combustion engine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4445481A (en) * 1980-12-23 1984-05-01 Toyota Jidosha Kogyo Kabushiki Kaisha Method for controlling the air-fuel ratio of an internal combustion engine
US4677559A (en) * 1984-01-30 1987-06-30 U.S. Philips Corporation Control arrangement for a combustion engine
US4669439A (en) * 1984-09-10 1987-06-02 Mazda Motor Corporation Air-to-fuel ratio control systems for internal combustion engines

Also Published As

Publication number Publication date
AU6080896A (en) 1997-02-06
KR970006824A (ko) 1997-02-21
KR100187974B1 (ko) 1999-06-01
EP0757167A3 (fr) 1998-04-08

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