US3926154A - Fuel control systems - Google Patents

Fuel control systems Download PDF

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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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engine
sensing
fuel
engine temperature
exhaust emission
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US466886A
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Malcolm Williams
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Lucas Electrical Co Ltd
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Lucas Electrical Co Ltd
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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.

Abstract

A fuel control system for an internal combustion engine comprising sensing devices for sensing the quantities of oxygen and carbon monoxide or unburnt hydrocarbons in the engine exhaust emission, a temperature measuring device, a control device for controlling the rate of supply of fuel to the engine in accordance with at least one engine parameter and apparatus controlled by the sensing devices and by the temperature measuring device so as to modify the rate of fuel supply in accordance with the quantity of carbon monoxide or unburnt hydrocarbon in the exhaust emission when the engine temperature is below a predetermined value and in accordance with the quantity of oxygen in the exhaust emission when the engine temperature is above the predetermined temperature.

Description

' United States Patent Williams FUEL CONTROL SYSTEMS Primary Examiner-Wendell E. Burns 75 Inventor: Malcolm William S l'h ll, E l d 1 O i u ng an Assistant E raminerRonald B. Cox [73] Ass1gnee: The Lucas Electrical Company Attorney, Agent, or Firm-Waters, Schwartz & Nissen Limited, Birmingham, England [22] Filed: May 3, 1974 [57] ABSTRACT [21] Appl. No.: 466,886 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. FOZB 3/00; FOZM 39/00 trolled by the Sensing devices and b the temperature [58] new of Search 123/32 139 179 measuring device so as to modify the rate of fuel sup- 123/179 G; 60/276 ply in accordance with the quantity of carbon monoxide or unburnt hydrocarbon in the exhaust emission [561 References C'ted when the engine temperature is below a predeter- UNITED STATES PATENTS mined value and in accordance with the quantity of 3,738,341 6/1973 LOOS t 1 60/276 Oxygen in the exhaust mission when the engine 3,745,768 7/1973 Zechnall 123/32 EA perature is above the predetermined temperature.
3,768,259 10/1973 Carnahan 1 60/276 3,827,237 8/1974 Linder 60 276 6 Chums, 2 Drawmg Figures THENQETTLE LE TRANSDUCER ENGINE V l I SPEED CONTROL TRANSDUCER DEV'CE ENGNE CONTROL COMPARATOR TEMPERATURE CIRCUI; 2 l
TRANSDUCER )Zl I9 I LOGIC 20 UNIT Low PASS FILTERS UNBURNT HYDROCARBON SENSOR US. Patent Dec. 16, 1975 3,926,154
THROTTLE ANGLE Q I O TRANSDUCER ENGINE CONTROL 4 SPEED E DEVICE TRANSDUCER I3 CONTROL COMPARATOR ENGINE TEMPERATURE CIRCUIp 2 I TRANSDUCER I i LOGIC 2O UN)IT LOW PASS FILTERS OXYGEN sENsoR I5 I4 UNBURNT [j HYDROCARBON sENsoR FIG.I
RELATIVE POLLUTANT AIR/FUEL RATIO FIG.2
FUEL CONTROL SYSTEMS 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.
The invention will now be more particularly described with reference to the accompanying drawings wherein:
FIG. 1 is a block circuit diagram illustrating one embodiment of a fuel control system according to the present invention, and
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.
Referring to FIG. 1, 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.
Now referring to the graph shown in FIG. 2, B is a curve of unburnt hydrocarbon content of the exhaust emission plotted against air/fuel ratio, and C is a curve of oxygen content of the exhaust emission plotted against air/fuel ratio. Thus, it will be seen that when the air/fuel ratio is on the rich side of the stoichiometric line (indicated by the reference numeral 22 in FIG. 2) a measure of the unburnt hydrocarbon content in the exhaust emission will produce a signal representative of the air/fuel ratio of the engine, and when the air/fuel ratio is on the lean side of the stoichiometric line 22 then the measure of the oxygen content in the exhaust emission will produce a signal representative of the air/fuel ratio of the engine. Now in practice, 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. Thus, during engine warm-up 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. When the engine has reached its normal operating temperature, 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.
Finally, it is to be appreciated that instead of using an unburnt hydrocarbon sensor, a carbon monoxide sensor could be used, A being a curve of carbon monoxide content of the exhaust emission plotted against air/fuel ratio.
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.
I claim:
1. 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.
2. A fuel control system as claimed in claim 1 in which said means for sensing the quantity of oxygen and said means for sensing the quantity of carbon monoxide or unburnt hydrocarbon, each comprises a sensing device which produces an electrical output signal the amplitude of which is representative of the quantity of the appropriate gas.
3. 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.
4. A fuel control system as claimed in claim 1 wherein said operation means includes logic means coupled to said engine temperature measuring means and to said oxygen sensing means and the sensing means for carbon monoxide or unburnt hydrocarbons for passing a signal from a selected one of said sensing means depending on whether the engine temperature is above or below said predetermined value.
5. 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.
6. A fuel control system as claimed in claim 1 wherein said 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.

Claims (6)

1. 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 FULE 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 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.
2. A fuel control system as claimed in claim 1 in which said means for sensing the quantity of oxygen and said means for sensing the quantity of carbon monoxide or unburnt hydrocarbon, each comprises a sensing device which produces an electrical output signal the amplitude of which is representative of the quantity of the appropriate gas.
3. 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.
4. A fuel control system as claimed in claim 1 wherein said operation means includes logic means coupled to said engine temperature measuring means and to said oxygen sensing means and the sensing means for carbon monoxide or unburnt hydrocarbons for passing a signal from a selected one of said sensing means depending on whether the engine temperature is above or below said predetermined value.
5. 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.
6. A fuel control system as claimed in claim 1 wherein said control means includes means for making the air/fual 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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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
US4121548A (en) * 1976-08-08 1978-10-24 Nippon Soken, Inc. Deteriorated condition detecting apparatus for an oxygen sensor
US4121554A (en) * 1976-07-02 1978-10-24 Nippondenso Co., Ltd. Air-fuel ratio feedback control system
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
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US4452207A (en) * 1982-07-19 1984-06-05 The Bendix Corporation Fuel/air ratio control apparatus for a reciprocating aircraft engine
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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
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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
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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
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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
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Also Published As

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

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