EP0134083A2 - Steuerungssysteme für ein Luft/Kraftstoffverhältnis-Justierungssystem - Google Patents

Steuerungssysteme für ein Luft/Kraftstoffverhältnis-Justierungssystem Download PDF

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Publication number
EP0134083A2
EP0134083A2 EP84304553A EP84304553A EP0134083A2 EP 0134083 A2 EP0134083 A2 EP 0134083A2 EP 84304553 A EP84304553 A EP 84304553A EP 84304553 A EP84304553 A EP 84304553A EP 0134083 A2 EP0134083 A2 EP 0134083A2
Authority
EP
European Patent Office
Prior art keywords
control system
air
fuel ratio
measurement
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.)
Withdrawn
Application number
EP84304553A
Other languages
English (en)
French (fr)
Other versions
EP0134083A3 (de
Inventor
Neville Herbert Daniel
Hugh Malcolm Duncan
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.)
Rover Co Ltd
Original Assignee
Rover Co Ltd
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 Rover Co Ltd filed Critical Rover Co Ltd
Publication of EP0134083A2 publication Critical patent/EP0134083A2/de
Publication of EP0134083A3 publication Critical patent/EP0134083A3/de
Withdrawn legal-status Critical Current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
    • F02D41/24—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
    • F02D41/24—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

  • the invention relates to control systems for air/fuel ratio adjustment systems for internal combustion engines. It has already been proposed, for example in our co-pending UK Patent Application 8216444, to measure the air/fuel ratio at which an internal combustion engine is operating by detecting and measuring combustible or combustion-supporting constituents in the exhaust gas. This measure is then used to effect an adjustment to bring the air/fuel ratio to a desired level. In this process of detecting combustion-supporting constituents, an auxiliary fuel such as butane is used.
  • auxiliary fuel should be kept to a minimum to avoid continuous replacement of small auxiliary fuel canisters and for that reason it is desired to control the operation of the air/fuel ratio measurement and adjustment system in such a way that the measurement system is operated only when there is a reasonable likelihood that adjustment will be required.
  • An object of the present invention is to provide a control system for an air/fuel ratio measurement and adjustment system for an internal combustion engine which operates at approximately daily intervals.
  • a control system for an air/fuel ratio measurement and adjustment system for an internal combustion engine comprising: an ambient temperature sensor, an engine coolant temperature sensor and means for initiating measurement of the air/fuel ratio in response to the engine coolant temperature not exceeding ambient temperature by more than a predetermined amount.
  • the coolant temperature drops slowly towards ambient temperature while the engine is not operating but will take several hours to approach within say 5°.of ambient temperature.
  • the coolant temperature does not approach close to ambient temperature during the day.
  • the coolant temperature may be below ambient temperature.
  • control system also comprises means for measuring the extent of engine inlet throttle opening, engine speed and absolute inlet manifold pressure, means for deriving from stored information an expected inlet manifold pressure to correspond to the measured throttle opening and engine speed, means for deriving and storing the ratio between the expected and actual manifold pressures, means for comparing a subsequently derived ratio between expected and actual manifold pressures with a previously determined such ratio and means for initiating measurement of the air/fuel ratio in response to a predetermined extent of change in said pressure ratio.
  • a pressure sensor for inlet manifold pressure which is also needed for other purposes, serves as the basis for providing a measure of ambient pressure and thus avoids the need for an independent ambient pressure sensor.
  • control system also incorporates means for detecting engine operating parameters capable of indicating vehicle operation in a normal cruising mode and means for preventing initiation of air/fuel ratio measurement except when the vehicle is operating in a normal cruising mode.
  • a central processor unit constituted by a digital micro-processor is connected to receive signals from the following sources:
  • the central processor unit also has access to stored data relating expected manifold pressure to engine speed and throttle opening when operating at sea level at normal atmospheric pressure. This data may for example be established by calibration of a test engine. Recalibration is required only after substantial altitude changes of say 300 metres so only a limited amount of data need be stored to give a coarse measurement of ambient pressure change. In response to supply from the central processor unit of given values of engine speed and throttle opening, this unit supplies the central processor unit with an expected value for manifold pressure.
  • the central processor unit also has an output leading to an air/fuel ratio sensor.
  • This may be a sensor which measures the degree of leanness of the mixture by combusting an auxiliary fuel in the exhaust gases and measuring the heating effect of this combustion.
  • the output from the central processor unit to the air/fuel ratio sensor simply initiates operation of the air/fuel ratio sensor.
  • An indication of the air/fuel ratio sensed is supplied to the central processor unit. If appropriate, the central processor unit then provides a signal to an air/fuel ratio control to adjust the air/fuel ratio to a desired level.
  • coolant temperature is above ambient by more than t°C
  • the system goes into the altitude sensing mode. Throttle angle, engine speed and manifold pressure are measured and the calibrated manifold pressure for the measured engine speed and throttle opening is looked up.
  • the ratio between measured manifold pressure and the stored calibrated value is derived as a percentage to give a measure of current ambient pressure. This percentage is compared with a previously recorded and stored value for this percentage ratio, representative of the ambient pressure at which the last calibration took place. There is a delay of approximately 200 seconds inherent in this comparison. If this change exceeds a given pressure difference ⁇ P, the process again proceeds to point A.
  • the initial monitoring process is repeated at approximately 200 second intervals until a substantial pressure change, indicative of a change in altitude, is measured.

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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)
  • Combined Controls Of Internal Combustion Engines (AREA)
EP84304553A 1983-08-05 1984-07-04 Steuerungssysteme für ein Luft/Kraftstoffverhältnis-Justierungssystem Withdrawn EP0134083A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8321176 1983-08-05
GB08321176A GB2144541B (en) 1983-08-05 1983-08-05 Control system for air/fuel ratio adjustment

Publications (2)

Publication Number Publication Date
EP0134083A2 true EP0134083A2 (de) 1985-03-13
EP0134083A3 EP0134083A3 (de) 1985-12-18

Family

ID=10546890

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84304553A Withdrawn EP0134083A3 (de) 1983-08-05 1984-07-04 Steuerungssysteme für ein Luft/Kraftstoffverhältnis-Justierungssystem

Country Status (4)

Country Link
EP (1) EP0134083A3 (de)
JP (1) JPS60104737A (de)
AU (1) AU3041384A (de)
GB (1) GB2144541B (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0356014A1 (de) * 1988-08-17 1990-02-28 Zeneca Limited Reaktivfarbstoffe
EP0440135A3 (en) * 1990-01-31 1993-06-23 Toyota Jidosha Kabushiki Kaisha An air-fuel ratio control device of an internal combustion engine
US20110208397A1 (en) * 2010-02-23 2011-08-25 Honda Motor Co., Ltd. Starting-clutch control apparatus

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3716991A (en) * 1970-04-28 1973-02-20 Toyo Kogyo Co Exhaust gas purifying device
US4040394A (en) * 1972-09-14 1977-08-09 Robert Bosch Gmbh Apparatus repetitively controlling the composition of exhaust emissions from internal combustion engines, in predetermined intervals
IT1081383B (it) * 1977-04-27 1985-05-21 Magneti Marelli Spa Apparecchiatura elettronica per il controllo dell'alimentazione di una miscela aria/benzina di un motore a combustione interna
GB2014336A (en) * 1978-01-19 1979-08-22 Bedford T J Internal Combustion Engine Utilising Liquefied Gaseous Fuel
US4241710A (en) * 1978-06-22 1980-12-30 The Bendix Corporation Closed loop system
JPS55138104A (en) * 1979-04-13 1980-10-28 Hitachi Ltd Engine controller

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0356014A1 (de) * 1988-08-17 1990-02-28 Zeneca Limited Reaktivfarbstoffe
EP0440135A3 (en) * 1990-01-31 1993-06-23 Toyota Jidosha Kabushiki Kaisha An air-fuel ratio control device of an internal combustion engine
US20110208397A1 (en) * 2010-02-23 2011-08-25 Honda Motor Co., Ltd. Starting-clutch control apparatus

Also Published As

Publication number Publication date
AU3041384A (en) 1985-02-07
GB2144541B (en) 1987-12-09
JPS60104737A (ja) 1985-06-10
GB8321176D0 (en) 1983-09-07
GB2144541A (en) 1985-03-06
EP0134083A3 (de) 1985-12-18

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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AK Designated contracting states

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PUAL Search report despatched

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Effective date: 19850822

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Effective date: 19861215

STAA Information on the status of an ep patent application or granted ep patent

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18D Application deemed to be withdrawn

Effective date: 19880209

RIN1 Information on inventor provided before grant (corrected)

Inventor name: DANIEL, NEVILLE HERBERT

Inventor name: DUNCAN, HUGH MALCOLM