US3926154A - Fuel control systems - Google Patents

Fuel control systems Download PDF

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Publication number
US3926154A
US3926154A US466886A US46688674A US3926154A US 3926154 A US3926154 A US 3926154A US 466886 A US466886 A US 466886A US 46688674 A US46688674 A US 46688674A US 3926154 A US3926154 A US 3926154A
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United States
Prior art keywords
engine
sensing
fuel
engine temperature
exhaust emission
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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
US466886A
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English (en)
Inventor
Malcolm Williams
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.)
Lucas Electrical Co Ltd
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Lucas Electrical Co Ltd
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Filing date
Publication date
Application filed by Lucas Electrical Co Ltd filed Critical Lucas Electrical Co Ltd
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Publication of US3926154A publication Critical patent/US3926154A/en
Anticipated expiration legal-status Critical
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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
    • F02D41/14—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
    • F02D41/149—Replacing of the control value by an other parameter
    • 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
    • F02D41/1439—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the position of the sensor
    • F02D41/1441—Plural sensors

Definitions

  • a fuel control system for an internal combustion engine comprising sensing devices for sensing the quantities of oxygen and carbon monoxide or unburnt hy- [301 Forelgn Appllc au0n Pl-mmy Data drocarbons in the engine exhaust emission, a tempera- May 1973 Umted Kmgdom 21446/73 ture measuring device, a control device for controlling the rate of supply of fuel to the engine in accordance [52] 123/32 EA; 123/139 E; 60/276 with at least one engine parameter and apparatus con- [Sl] llli. Cl.
  • This invention relates to fuel control systems for use with internal combustion engines and has as its object the provision of such a system in a convenient form.
  • the invention resides in a fuel control system for use with an internal combustion engine comprising means for sensing the quantity of oxygen within the exhaust emission of the engine, means forsensing the quantity of carbon monoxide or unburnt hydrocarbon within the exhaust emission, means for measuring the temperature of the engine, and control means for controlling the rate of supply of fuel to the engine in accordance with at least one engine parameter and means for modifying the quantity of fuel fed to the engine in accordance with the quantity of carbon monoxide or unburnt hydrocarbon within the exhaust emission when the engine temperature is below a predetermined value and in accordance with the quantity of oxygen within the exhaust emission when the engine temperature is above said predetermined value.
  • FIG. 1 is a block circuit diagram illustrating one embodiment of a fuel control system according to the present invention.
  • FIG. 2 is a graph of the relative pollutant in the exhaust emission of an engine plotted against the air/fuel ratio of the engine.
  • the fuel control system shown therein comprises a control device which produces an electrical output pulse on a line 11 to an injector.
  • the length of the electrical output pulse determines the time for which the injector allows fuel to pass from a pump into the engine, and hence the rate at which fuel is fed to the internal combustion engine.
  • the control device 10 is programmed such that the length of the electrical output pulse is dependent upon the values of two engine parameters, namely the throttle angle and the engine speed and to this end a transducer 12 is provided for feeding the signal representative of the throttle angle to the control device 10, and-a transducer 13 is provided for feeding a signal representative of the engine speed to the control device 10.
  • Means are also provided for modifying the length of the electrical output pulse in accordance with the nature of the exhaust emission of the internal combustion engine.
  • Such means comprises an oxygen sensor 14 and an unburnt hydrocarbon sensor 15.
  • the sensors 14 and 15 produce electrical signals, the amplitude of which are representative of the quantity of oxygen within the exhaust emission and the quantity of unburnt hydrocarbon within the exhaust emission respectively.
  • These signals are fed to low pass filters 16 and 17 respectively, which serve as averaging circuits, and the output of the two low pass filters l6 and 17 are fed to a logic unit 18.
  • a transducer 19 is provided for producing a signal representative of the engine temperature and this signal is fed on the one hand to the logic unit 18 and on the other hand to a control circuit 20.
  • the logic unit 18 connects the output from the low pass filter 17 to a first input of a comparator 21 when the output of the transducer 19 is below a predetermined value, representing a set hot engine temperature, and connects the output of the low pass filter 16 to said first input of the comparator 21 when the output of the transducer 19 is above said predetermined value.
  • the control device 20 produces an output which varies in accordance with the engine temperature; and which is representative of the required air/fuel ratio of the engine, and this output from the control circuit 20 is fed to a second input of the comparator 21.
  • B is a curve of unburnt hydrocarbon content of the exhaust emission plotted against air/fuel ratio
  • C is a curve of oxygen content of the exhaust emission plotted against air/fuel ratio.
  • the air/fuel ratio of the engine will only be on the rich side when the engine temperature is low that is to say during initial warm-up of the engine, and once the engine temperature has achieved its normal operating temperature then air/fuel ratio will be on the lean side of the stoichiometric line 22.
  • the logic unit 18 connects the unburnt hydrocarbon sensor 15 to said first input of the comparator 21 which compares the actual air/fuel ratio of the engine with the required air/fuel ratio of the engine and produces an output which is connected to the control device 10 for modifying the length of the electrical output from the device 10 and thereby adjusting the quantity of fuel fed to the engine.
  • the logic unit 18 connects the oxygen sensor 14 to said first input of the comparator 21 and once again the electrical output pulse of the device 10 is modified in accordance with the difference between the signals of the two inputs of the comparator 21.
  • the invention may also be applied to fuel system in which a variable speed fuel pump continuously injects fuel into the engine air intake at a rate determined by the control system.
  • a fuel control system for an internal combustion engine comprising means for sensing the quantity of oxygen within the exhaust emission of the engine, means for sensing the quantity of carbon monoxide or unburnt hydrocarbon within the exhaust emission, means for measuring the temperature of the engine, control means for controlling the rate of supply of fuel to the engine in accordance with at least one engine parameter, and operation means coupled to said engine temperature measuring means and to said control means for modifying the quantity of fuel fed to the engine in accordance with engine temperature and the quantity of carbon monoxide or unburnt hydrocarbon within the exhaust emission when the engine temperature is below a predetermined value and in accordance with the quantity of oxygen within the exhaust emission when the engine temperature is above said predetermined value.
  • a fuel control system as claimed in claim 2 including a low pass filter for each sensing device connected to reject high frequency components in said electrical output signals.
  • a fuel control system as claimed in claim 4 wherein said operation means further comprises a comparator connected to said logic means for receiving the signal passed thereby, and means coupled to said engine temperature measuring means and to said comparator to provide a second signal to the comparator indicative of the required air/fuel ratio at the particular engine temperature which is measured.
  • control means includes means for making the air/fuel ratio relatively rich when engine temperature is low and for making the air/fuel ratio relatively lean when engine temperature is high.

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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)
US466886A 1973-05-04 1974-05-03 Fuel control systems Expired - Lifetime US3926154A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2144673A GB1471525A (en) 1973-05-04 1973-05-04 Fuel control systems

Publications (1)

Publication Number Publication Date
US3926154A true US3926154A (en) 1975-12-16

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ID=10163090

Family Applications (1)

Application Number Title Priority Date Filing Date
US466886A Expired - Lifetime US3926154A (en) 1973-05-04 1974-05-03 Fuel control systems

Country Status (7)

Country Link
US (1) US3926154A (enrdf_load_stackoverflow)
JP (1) JPS5026913A (enrdf_load_stackoverflow)
CS (1) CS212293B2 (enrdf_load_stackoverflow)
DE (1) DE2421608C2 (enrdf_load_stackoverflow)
FR (1) FR2228154B1 (enrdf_load_stackoverflow)
GB (1) GB1471525A (enrdf_load_stackoverflow)
IT (1) IT1011362B (enrdf_load_stackoverflow)

Cited By (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4062337A (en) * 1974-09-26 1977-12-13 Regie Nationale Des Usines Renault Electro-pneumatic device for regulating the supply of air to an internal combustion engine
US4088096A (en) * 1976-02-16 1978-05-09 Alfa Romeo S.P.A. Internal combustion engine comprising an exhaust system provided with probes for exhaust gas analysis
US4117815A (en) * 1975-04-22 1978-10-03 Nissan Motor Company, Limited Closed-loop mixture control system for internal combustion engine using error-corrected exhaust composition sensors
US4121554A (en) * 1976-07-02 1978-10-24 Nippondenso Co., Ltd. Air-fuel ratio feedback control system
US4121548A (en) * 1976-08-08 1978-10-24 Nippon Soken, Inc. Deteriorated condition detecting apparatus for an oxygen sensor
US4131087A (en) * 1974-11-22 1978-12-26 The Lucas Electrical Company Limited Fuel injection system for an internal combustion engine
US4132195A (en) * 1976-07-17 1979-01-02 Robert Bosch Gmbh Method and apparatus for fuel mixture control
US4150645A (en) * 1977-08-19 1979-04-24 Colt Industries Operating Corp. Circuit means and apparatus for controlling the air-fuel ratio supplied to a combustion engine
US4158347A (en) * 1976-04-28 1979-06-19 Toyota Jidosha Kogyo Kabushiki Kaisha Fuel supply system for use in internal combustion engine
US4167924A (en) * 1977-10-03 1979-09-18 General Motors Corporation Closed loop fuel control system having variable control authority
US4169439A (en) * 1977-03-21 1979-10-02 Colt Industries Operating Corp. Circuit means and apparatus for controlling the air-fuel ratio supplied to a combustion engine
US4170967A (en) * 1976-02-04 1979-10-16 Robert Bosch Gmbh Apparatus for controlling the mixture of an internal combustion engine
US4194471A (en) * 1977-03-03 1980-03-25 Robert Bosch Gmbh Internal combustion engine exhaust gas monitoring system
US4197822A (en) * 1977-02-14 1980-04-15 Colt Industries Operating Corp. Circuit means and apparatus for controlling the air-fuel ratio supplied to a combustion engine
US4210114A (en) * 1977-03-07 1980-07-01 Toyota Jidosha Kogyo Kabushiki Kaisha Air-fuel ratio control apparatus for an internal combustion engine
US4223651A (en) * 1979-02-06 1980-09-23 Colt Industries Operating Corp Solenoid vacuum control valve means and apparatus and system for controlling the air-fuel ratio supplied to a combustion engine
US4244340A (en) * 1975-04-18 1981-01-13 Robert Bosch Gmbh Method and apparatus for controlling fuel management for an internal combustion engine
US4271798A (en) * 1978-10-27 1981-06-09 The Bendix Corporation Alternate closed loop control system for an air-fuel ratio controller
US4362499A (en) * 1980-12-29 1982-12-07 Fisher Controls Company, Inc. Combustion control system and method
US4372155A (en) * 1981-05-20 1983-02-08 Ford Motor Company Methods of monitoring a combustion system
US4452207A (en) * 1982-07-19 1984-06-05 The Bendix Corporation Fuel/air ratio control apparatus for a reciprocating aircraft engine
US4625698A (en) * 1985-08-23 1986-12-02 General Motors Corporation Closed loop air/fuel ratio controller
US5179833A (en) * 1990-08-28 1993-01-19 Honda Giken Kogyo Kabushiki Kaisha System for detecting deterioration of a three-way catalyst of an internal combustion engine
US5311854A (en) * 1993-01-25 1994-05-17 Brqt Corporation Two-cycle internal combustion engine with reduced unburned hydrocarbons in the exhaust gas
WO1994023191A1 (en) * 1993-03-30 1994-10-13 Brqt Corporation Two-cycle engine with reduced hydrocarbon emissions
US5582156A (en) * 1993-01-25 1996-12-10 Brqt Corporation Two-cycle internal combustion engine with reduced unburned hydrocarbons in the exhaust gas and adjustable spark gap electrodes
US5869743A (en) * 1996-02-09 1999-02-09 Sun Electric U.K. Limited Method and apparatus for analyzing catalyst and other systems operations
US6148809A (en) * 2000-01-10 2000-11-21 Cinquegrani; Vincent J. Oxygen sensor controlled continuous flow fuel system
US20110039216A1 (en) * 2008-04-22 2011-02-17 Basf Se Process for controlling the addition of an auxiliary fuel

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2554988C2 (de) * 1975-12-06 1985-01-10 Robert Bosch Gmbh, 7000 Stuttgart Verfahren zur Bestimmung der Zusammensetzung des einer Brennkraftmaschine zugeführten Betriebsgemisches bzw. des Verbrennungsablaufs des Betriebsgemisches und Einrichtung zur Durchführung des Verfahrens
FR2384955B2 (fr) * 1977-02-14 1987-02-27 Colt Ind Operating Corp Dispositif et montage electrique pour regler la richesse du melange alimentant un moteur a explosion
GB2001129B (en) * 1977-07-12 1982-08-04 Ntn Toyo Bearing Co Ltd FUEL FEEDING APPARATUS FOR air fuel combustion mixture
JPS5440922A (en) * 1977-09-07 1979-03-31 Toyota Motor Corp Air fuel ratio control equipment of internal combustion engine
JPS5535181A (en) * 1978-09-05 1980-03-12 Nippon Denso Co Ltd Air fuel ratio control device
JPS5779228A (en) * 1980-10-31 1982-05-18 Suzuki Motor Co Ltd Air fuel ratio control for carbureter
JPS59544A (ja) * 1982-06-23 1984-01-05 Takeshi Ikeda 液体燃料と気体燃料を併用するエンジン
JPS5977058A (ja) * 1982-10-25 1984-05-02 Takeshi Ikeda エンジン及び該エンジンの運転方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3738341A (en) * 1969-03-22 1973-06-12 Philips Corp Device for controlling the air-fuel ratio {80 {11 in a combustion engine
US3745768A (en) * 1971-04-02 1973-07-17 Bosch Gmbh Robert Apparatus to control the proportion of air and fuel in the air fuel mixture of internal combustion engines
US3768259A (en) * 1971-07-06 1973-10-30 Universal Oil Prod Co Control for an engine system
US3827237A (en) * 1972-04-07 1974-08-06 Bosch Gmbh Robert Method and apparatus for removal of noxious components from the exhaust of internal combustion engines

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL156787B (nl) * 1969-03-22 1978-05-16 Philips Nv Inrichting voor de automatische regeling van de lucht-brandstofverhouding van het aan een verbrandingsmotor toegevoerde mengsel.

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3738341A (en) * 1969-03-22 1973-06-12 Philips Corp Device for controlling the air-fuel ratio {80 {11 in a combustion engine
US3745768A (en) * 1971-04-02 1973-07-17 Bosch Gmbh Robert Apparatus to control the proportion of air and fuel in the air fuel mixture of internal combustion engines
US3768259A (en) * 1971-07-06 1973-10-30 Universal Oil Prod Co Control for an engine system
US3827237A (en) * 1972-04-07 1974-08-06 Bosch Gmbh Robert Method and apparatus for removal of noxious components from the exhaust of internal combustion engines

Cited By (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4062337A (en) * 1974-09-26 1977-12-13 Regie Nationale Des Usines Renault Electro-pneumatic device for regulating the supply of air to an internal combustion engine
US4131087A (en) * 1974-11-22 1978-12-26 The Lucas Electrical Company Limited Fuel injection system for an internal combustion engine
US4244340A (en) * 1975-04-18 1981-01-13 Robert Bosch Gmbh Method and apparatus for controlling fuel management for an internal combustion engine
US4117815A (en) * 1975-04-22 1978-10-03 Nissan Motor Company, Limited Closed-loop mixture control system for internal combustion engine using error-corrected exhaust composition sensors
US4170967A (en) * 1976-02-04 1979-10-16 Robert Bosch Gmbh Apparatus for controlling the mixture of an internal combustion engine
US4088096A (en) * 1976-02-16 1978-05-09 Alfa Romeo S.P.A. Internal combustion engine comprising an exhaust system provided with probes for exhaust gas analysis
US4158347A (en) * 1976-04-28 1979-06-19 Toyota Jidosha Kogyo Kabushiki Kaisha Fuel supply system for use in internal combustion engine
US4121554A (en) * 1976-07-02 1978-10-24 Nippondenso Co., Ltd. Air-fuel ratio feedback control system
US4132195A (en) * 1976-07-17 1979-01-02 Robert Bosch Gmbh Method and apparatus for fuel mixture control
US4121548A (en) * 1976-08-08 1978-10-24 Nippon Soken, Inc. Deteriorated condition detecting apparatus for an oxygen sensor
US4197822A (en) * 1977-02-14 1980-04-15 Colt Industries Operating Corp. Circuit means and apparatus for controlling the air-fuel ratio supplied to a combustion engine
US4194471A (en) * 1977-03-03 1980-03-25 Robert Bosch Gmbh Internal combustion engine exhaust gas monitoring system
US4210114A (en) * 1977-03-07 1980-07-01 Toyota Jidosha Kogyo Kabushiki Kaisha Air-fuel ratio control apparatus for an internal combustion engine
US4169439A (en) * 1977-03-21 1979-10-02 Colt Industries Operating Corp. Circuit means and apparatus for controlling the air-fuel ratio supplied to a combustion engine
US4150645A (en) * 1977-08-19 1979-04-24 Colt Industries Operating Corp. Circuit means and apparatus for controlling the air-fuel ratio supplied to a combustion engine
US4167924A (en) * 1977-10-03 1979-09-18 General Motors Corporation Closed loop fuel control system having variable control authority
US4271798A (en) * 1978-10-27 1981-06-09 The Bendix Corporation Alternate closed loop control system for an air-fuel ratio controller
US4223651A (en) * 1979-02-06 1980-09-23 Colt Industries Operating Corp Solenoid vacuum control valve means and apparatus and system for controlling the air-fuel ratio supplied to a combustion engine
US4362499A (en) * 1980-12-29 1982-12-07 Fisher Controls Company, Inc. Combustion control system and method
US4372155A (en) * 1981-05-20 1983-02-08 Ford Motor Company Methods of monitoring a combustion system
US4452207A (en) * 1982-07-19 1984-06-05 The Bendix Corporation Fuel/air ratio control apparatus for a reciprocating aircraft engine
US4625698A (en) * 1985-08-23 1986-12-02 General Motors Corporation Closed loop air/fuel ratio controller
US5179833A (en) * 1990-08-28 1993-01-19 Honda Giken Kogyo Kabushiki Kaisha System for detecting deterioration of a three-way catalyst of an internal combustion engine
US5311854A (en) * 1993-01-25 1994-05-17 Brqt Corporation Two-cycle internal combustion engine with reduced unburned hydrocarbons in the exhaust gas
US5388561A (en) * 1993-01-25 1995-02-14 Brqt Corporation Two-cycle internal combustion engine with reduced unburned hydrocarbons in the exhaust gas and adjustable spark gap electrodes
US5582156A (en) * 1993-01-25 1996-12-10 Brqt Corporation Two-cycle internal combustion engine with reduced unburned hydrocarbons in the exhaust gas and adjustable spark gap electrodes
WO1994023191A1 (en) * 1993-03-30 1994-10-13 Brqt Corporation Two-cycle engine with reduced hydrocarbon emissions
US5869743A (en) * 1996-02-09 1999-02-09 Sun Electric U.K. Limited Method and apparatus for analyzing catalyst and other systems operations
US6148809A (en) * 2000-01-10 2000-11-21 Cinquegrani; Vincent J. Oxygen sensor controlled continuous flow fuel system
US20110039216A1 (en) * 2008-04-22 2011-02-17 Basf Se Process for controlling the addition of an auxiliary fuel
EP2300748B1 (de) 2008-04-22 2016-10-26 Basf Se Verfahren zur regelung der zugabe eines zusatzbrennstoffs

Also Published As

Publication number Publication date
FR2228154A1 (enrdf_load_stackoverflow) 1974-11-29
DE2421608A1 (de) 1974-11-21
CS212293B2 (en) 1982-03-26
FR2228154B1 (enrdf_load_stackoverflow) 1976-06-25
AU6852074A (en) 1975-11-06
DE2421608C2 (de) 1986-04-30
JPS5026913A (enrdf_load_stackoverflow) 1975-03-20
GB1471525A (en) 1977-04-27
IT1011362B (it) 1977-01-20

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