US3898962A - Control system and devices for internal combustion engines - Google Patents

Control system and devices for internal combustion engines Download PDF

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Publication number
US3898962A
US3898962A US365729A US36572973A US3898962A US 3898962 A US3898962 A US 3898962A US 365729 A US365729 A US 365729A US 36572973 A US36572973 A US 36572973A US 3898962 A US3898962 A US 3898962A
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Prior art keywords
output
control device
input
frequency
divider
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Expired - Lifetime
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US365729A
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English (en)
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Gunther Honig
Uwe Kiencke
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Robert Bosch GmbH
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Robert Bosch GmbH
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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
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/2403—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially up/down counters
    • 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
    • F02D41/1477—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the regulation circuit or part of it,(e.g. comparator, PI regulator, output)
    • F02D41/1482—Integrator, i.e. variable slope
    • 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
    • F02D41/18—Circuit arrangements for generating control signals by measuring intake air flow
    • F02D41/182—Circuit arrangements for generating control signals by measuring intake air flow for the control of a fuel injection device

Definitions

  • an air flow meter is arranged in the induction pipe of the engine which has an output providing signals in digital form, for example by controlling the frequency of an osciallator which is then converted into digital signals by a frequency/digital converter.
  • the digital signals are applied to a computing circuit which includes a digital differential analyzer and an interpolator, or function generator which is connected therein and so set that it simulates the operating characteristics of the internal combustion engine to modify the digital signal and provide an output which can be converted by a frequency/time converter to a timing signal to control the solenoid of the fuel injection valve and open the fuel injection valve for a predetermined period of time, depending on rate of air flow, or other engine parameters, and as adjusted for the operating characteristics of the engine over its operating range.
  • a computing circuit which includes a digital differential analyzer and an interpolator, or function generator which is connected therein and so set that it simulates the operating characteristics of the internal combustion engine to modify the digital signal and provide an output which can be converted by a frequency/time converter to a timing signal to control the solenoid of the fuel injection valve and open the fuel injection valve for a predetermined period of time, depending on rate of air flow, or other engine parameters, and as adjusted for the operating characteristics of the engine over its operating range.
  • PATENTE mm 2 L975 SHEET fOS COUNTER CONTROL SYSTEM AND DEVICES FOR INTERNAL COMBUSTION ENGINES The invention relates to a control device for a fuel injection system of an internal combustion engine, having a computing circuit.
  • a computing circuit for controlling at least one injection valve in dependence upon the rate of air flow as measured by an air flow meter arranged in the engine induction pipe.
  • Direct voltage signals are formed in the computing circuit and are proportional to the rate of air flow and the rotational speed of the crankshaft. These signals are further processed as analog signals in direct voltage amplifier stages.
  • Such direct voltage amplifier stages serving as analog computers have to be adjusted very accurately and cause considerable difficulties with respect to their long-term stability.
  • analog computing circuits are very sensitive to interference pulses which are produced in motor vehicles by, for example, the ignition system or the direction indicators.
  • An air flow meter is arranged in the induction pipe of the engine and provides digital air flow output signals.
  • a computing circuit has an input connected to receive the digital output signals. The computing circuit output controls the solenoid of the fuel injection valve.
  • the computing circuit comprises a digital differential analyzer and at least one interpolator serving as a store for simulating the operating characteristics of the internal combustion engine.
  • the air flow meter comprises an air flow sensitive element which controls the frequency of an oscillator such that its output frequency is dependent upon the rate of air flow.
  • a frequency/digital converter then'provides the digital output.
  • the frequency/digital converter then preferably is the input circuit for thedigital differential analyzer.
  • a frequency/digital converter converts an input frequency (whose value may be an analog of an operating parameter of the engine, such as the rate of air flow) into a digital output.
  • An interpolator processes a digital input (in this case the output of the frequency/digital converter) in accordance with predetermined functions to produce a digital output dependent upon the interpolator input in accordance with said functions (which may represent one or more known operating characteristics of the' engine).
  • the frequency/digital converter and the interpolator contain counters which require no adjustment. Interference pulses may possibly cause slight errors in counting but such errors can be made negligible if sufficiently high frequencies are chosen.
  • the digital differential analyzer is in the particular description with reference to the drawings referred to as an incremental computing circuit since, in the same manner as in an analog computer, the function value is stored in a counter once it has been calculated,
  • the digital differential analyzer operates to a large extent like an analog computer and, nevertheless, can achieve the same accuracy as a conventional digital computing circuit, since the calculated function value is present in the counter in the form of a binary number having a plurality of digits.
  • the accuracy can be increased by increasing the number of digits of the binary numbers.
  • the number of digits is limited by the required rate of computing.
  • the functions or characteristics, according to which the injected quantity of fuel have to depend upon operating parameters, such as the engine speed or the rate of air flow in order to obtain optimum combustion of the air/fuel mixture, can be ascertained experimentally in an internal combustion engine. These functions are to be simulated by the computing circuit and, for this reason, have to be stored therein.
  • the interpolator serves as a store for the functional interrelationships designated fields of characteristics, and converts an input frequency into an output frequency which is generally non-linearly dependent upon the input frequency.
  • the functions or fields of characteristics ascertained experimentally can be adapted to any desired internal combustion engine.
  • the injection valves are operated intermittently and are opened for a specific injection period at each stroke of the associated cylinder of the internal combustion engine.
  • the quantity of fuel injected is at least approximately proportional to the injection period, since the valves are fully opened during this period.
  • the injection valves are open continuously.
  • the flow cross section, and thus the quantity of fuel injected into the induction pipe per unit of time, is proportional to a control current which is fed to the solenoids of the injection valves.
  • the control device in accordance with the invention can be adapted to the first type of fuel injection system in which intermittently operating injection valves are provided for metering the fuel, by feeding the output frequency of at least one interpolator to a frequency/- time converter for the purpose of controlling the injection valves.
  • the frequency/time converter serves to convert the output frequency of the interpolator into an injection period proportional thereto.
  • the control device of the present invention can be adapted to the second type of fuel injection system in which continuously operating injection valves are provided for metering the fuel, by feeding the output frequency of at least one interpolator at least indirectly to the electrical inputs of the injection valves. If it is ensured that the output frequency of the interpolator consists of pulses of constant length, the average current strength fed to the injection valves is proportional to this output frequency of the interpolator.
  • the inductance of the solenoid serving to open an injection valve serves to form the average value of the current.
  • the digital differential analyzer When the digital differential analyzer is used to control the fuel injection system, it is preferable for it to also effect the so-called warming-up enrichment of the fuel/air mixture, since'an internal combustion engine requires a richer mixture when in the cold state.
  • the mixture can be enriched during the warming-up phase if the electrical output of a temperature sensor in thermal contact with the engine block of the internal combustion engine is connected to the input of a voltage/- frequency converter, the output of the oscillator is connectedto a first frequency/digital converter, and the output of the voltage/frequency converter is connected to a second frequency/digital converter.
  • a plurality of non-linear fields of characteristics of the internal-combustion engine can be superimposed by connecting a respective interpolator to the output of each frequency/digital converter.
  • the air flow meter fitted in the induction pipe measures a quantity of air which flows through the induction pipe per unit of time.
  • a specific quantity of fuel is likewise injected into the induction pipe per unit of time in the case of continuously operating injection valves. Therefore, a'further correction circuit is not required and the output frequencies of the interpolators can be fed without further processing to the solenoids of the injection valves.
  • a further correction circuit is required to take into account the speed of the internal combustion engine.
  • the open periods of the inlet valves are shorter at higher speeds of the internal combustion engine, so that the internal combustion engine draws in a smaller quantity of air per stroke with the same measured rate of air flow per unit of time.
  • the speed of the internal combustion engine also has to be taken into account for accurately calculating the quantity of fuel to be injected. This can be achieved if the second interpolator and the pulse tachogenerator are connected to two inputs of a divider, the outputs of the first interpolator and the divider are connected to two inputs of a multiplier, and the output of the multiplier is connected to the input of the frequency/time converter whose output serves for controlling the injection valves.
  • the frequency/time converter converts the output frequency of the computing circuit into an injection period proportional thereto.
  • the above-described features of the control device in accordance with the invention at the same time enable the exhaust gases to be relatively uncontaminated with obnoxious substances, since the above-mentioned simulation of the fields of characteristics of the internal combustion engine leads to optimum combustion of the air/fuel mixture.
  • the cleanliness of the exhaust gases can be still further improved however if an oxygen measuring sensor is arranged in an exhaust gas collecting manifold of the internal combustion engine, the output of the oxygen measuring sensor being connected to a further input of the computing circuit by way of a voltage/frequency converter.
  • the oxygen measuring senser ascertains the accuracy with which the optimum fuel/air mixture has been calculated.
  • the injection period calculated by the computing circuit in dependence upon the operating parameters of the internal combustion engine can be corrected in a particularly accurate manner in dependence upon the output signal of the oxygen measuring sensor if a servoloop having a subtractor for comparing the desired value with the actual value is provided for the air number of the air/fuel mixture fed to the internal combustion engine, and if the voltage/frequency converter is connected to a first input of the subtractor and a desiredvalue setter is connected'to'the second input of the subtractor.
  • the air number A represents the mass ratio of air to fuel and is chosen to be 1.0 for a stoichiometric mixture).
  • the computing circuit becomes a component part of the servo-loop which controls the injection period in dependence upon the actual measured composition of the air/fuel mixture.
  • control device as a servoloop has'a further advantage that the computing accuracy does not have to be' so high. That is to say, a small error in the calculated injection period is immediately corrected by the servo-loop. Therefore, in the embodiment having a servo-loop, the total expenditure on circ'uitry is only slightly greater than in the embodiment without such a feedback loop.
  • FIG. 1 is a schematic diagram of an internal combustion engine having various measuring transducers
  • FIG. 2a is a sectional view of an oxygen mearuing sensor
  • FIG. 2b is a graph of the output voltage of the oxygen measuring sensor
  • FIG. 3a is a block circuit diagram of a first embodiment of control device in accordance with the invention.
  • FIG. 3b is a block circuit diagram of a second embodiment of control device
  • FIG. 4a is a circuit diagram of a series multiplier
  • FIG. 4b is a pulse diagram for explaining the mode of operation of the series multiplier illustrated in FIG. 4a;
  • FIG. 5a is a block circuit diagram :of a frequency/digital converter and an interpolator of the control devices of FIGS. 3a and 3b,
  • FIGS. 5b and 5c are graphs for explaining the mode of operation of the.circuit illustrated in FIG. 5a;
  • FIG. 6 is a block circuit diagram of a divider and a plurality of multipliers of the control devices of FIGS. 3a and 3b;
  • FIG. 7 is a circuit diagram of a frequency/time converter of the control device of FIG. 3a;
  • FIGS. 8a to are block circuit diagrams of parts of further embodiments of control devices in accordance with the invention (third to fifth embodiments); I
  • FIG. 9a is a circuit diagram of thefrequency/digital converter of FIG. 5a;
  • FIG. 9b shows pulse graphs for explaining the operation of the frequency/digital converter of FIG. 5a
  • FIG. 9c is a circuit diagram of a modification of the frequency/digital converter illustrated in FIG. 9a;
  • FIG. 10 is a circuit diagram of a central divider counter appearing in FIG. 5a and subsequent Figures;
  • FIG. 11a is a circuit diagram of a pulse generator of FIG. 5a; 1
  • FIG. 1 1b is a pulse diagram for explaining the mode of operation of the pulse generator illustrated in FIG. 1 la; f 1
  • FIG. 12a is a circuit diagram of a range decoder of Fio.sa,--
  • FIG. 12b is a table for explaining the switching functions of the range decoder illustrated-in FIG. 12a;
  • FIG. 13 is a circuit diagram of a divider-gate of the kind appearing in FIG. 5a and subsequent Figures;
  • FIG. 14a is a circuit diagram of a divider of FIG. 3a

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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)
  • Electrical Control Of Ignition Timing (AREA)
  • Measuring Volume Flow (AREA)
  • Testing Of Engines (AREA)
US365729A 1972-06-02 1973-05-31 Control system and devices for internal combustion engines Expired - Lifetime US3898962A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2226949A DE2226949C3 (de) 1972-06-02 1972-06-02 Steuereinrichtung für eine Betriebskenngröße einer Brennkraftmaschine, insbesondere zur Bestimmung eines Kraftstoffzumeßsignals

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US3898962A true US3898962A (en) 1975-08-12

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US365729A Expired - Lifetime US3898962A (en) 1972-06-02 1973-05-31 Control system and devices for internal combustion engines

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US (1) US3898962A (ja)
JP (1) JPS6014184B2 (ja)
DE (1) DE2226949C3 (ja)
FR (1) FR2189635B1 (ja)
GB (1) GB1395457A (ja)
IT (1) IT988897B (ja)

Cited By (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3946709A (en) * 1973-10-17 1976-03-30 Societe Des Procedes Modernes D'inject Sopromi Tachometric and angular programming system for rotary device
US3960120A (en) * 1974-06-21 1976-06-01 Nisan Motor Co., Ltd. Electronic fuel injection control circuit for an internal combustion engine
US3971348A (en) * 1974-05-08 1976-07-27 International Harvester Company Computer means for sequential fuel injection
US3983851A (en) * 1974-03-18 1976-10-05 Hitachi, Ltd. Electronic fuel injection apparatus
US3991727A (en) * 1974-06-14 1976-11-16 Nippon Soken, Inc. Electronically controlled fuel injection system
US4020802A (en) * 1974-03-21 1977-05-03 Nippon Soken, Inc. Fuel injection system for internal combustion engine
US4026251A (en) * 1975-11-26 1977-05-31 Pennsylvania Research Corporation Adaptive control system for power producing machines
US4031866A (en) * 1974-07-24 1977-06-28 Nissan Motor Co., Ltd. Closed loop electronic fuel injection control unit
US4060714A (en) * 1976-05-20 1977-11-29 Chrysler Corporation Input sensor circuit for a digital engine controller
US4080940A (en) * 1977-06-23 1978-03-28 Caterpillar Tractor Co. Engine control
US4121553A (en) * 1976-03-12 1978-10-24 Nippondenso Co., Ltd. Electric ignition advance system
US4134368A (en) * 1977-06-06 1979-01-16 Edelbrock-Hadley Corporation Fuel injection control system
US4155332A (en) * 1977-05-18 1979-05-22 Toyota Jidosha Kogyo Kabushiki Kaisha Electronic fuel injection system in an internal combustion engine
US4172433A (en) * 1974-12-05 1979-10-30 Robert Bosch Gmbh Process and apparatus for fuel-mixture preparation
US4173952A (en) * 1975-04-24 1979-11-13 Nissan Motor Company, Limited Closed-loop mixture control system for an internal combustion engine with improved response characteristic to idling condition
US4176629A (en) * 1976-12-10 1979-12-04 Nippon Soken, Inc. Electric control method for fuel injection and ignition timing
US4188922A (en) * 1976-11-16 1980-02-19 Toyota Jidosha Kogyo Kabushiki Kaisha Digital control device for a fuel injection system of an internal combustion engine
US4199812A (en) * 1975-11-18 1980-04-22 Robert Bosch Gmbh Apparatus for determining the duration of fuel injection control pulses
US4201159A (en) * 1977-03-23 1980-05-06 Nippon Soken, Inc. Electronic control method and apparatus for combustion engines
US4223644A (en) * 1977-11-11 1980-09-23 Robert Bosch Gmbh Method and apparatus for controlling operational variables of an internal combustion engine
US4250858A (en) * 1978-08-09 1981-02-17 Robert Bosch Gmbh Input-output unit for microprocessor controlled ignition or injection systems in internal combustion engines
US4276601A (en) * 1977-09-21 1981-06-30 Hitachi, Ltd. Electronic engine control apparatus
USRE30928E (en) * 1977-06-23 1982-05-11 Caterpillar Tractor Co. Engine control
US4334513A (en) * 1979-06-29 1982-06-15 Nissan Motor Co., Ltd. Electronic fuel injection system for internal combustion engine
US4359991A (en) * 1978-01-28 1982-11-23 Robert Bosch Gmbh Method and apparatus for fuel metering in internal combustion engines
US4363307A (en) * 1980-03-07 1982-12-14 Hitachi, Ltd. Method for adjusting the supply of fuel to an internal combustion engine for an acceleration condition
US4548178A (en) * 1982-11-22 1985-10-22 Toyota Jidosha Kabushiki Kaisha Method and apparatus for controlling the air-fuel ratio in an internal-combustion engine
US4843555A (en) * 1984-12-28 1989-06-27 Isuzu Motors Limited Signal processing system for vehicular acceleration sensor
US20080053411A1 (en) * 2006-08-31 2008-03-06 Juergen Raimann Method for operating an internal combustion engine
EP1930568A1 (en) * 2006-12-07 2008-06-11 Abb Research Ltd. Method and system for monitoring process states of an internal combustion engine
US20140060467A1 (en) * 2011-07-19 2014-03-06 Lightsail Energy, Inc. Valve
US20160282169A1 (en) * 2015-03-26 2016-09-29 Rosemount Inc. Health monitor for turbine flow meter

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JPS5135824A (ja) * 1974-09-20 1976-03-26 Mikuni Kogyo Kk Hibanatenkakikanyonenryofunshutsusochi
JPS5139322A (ja) * 1974-09-30 1976-04-01 Hitachi Ltd Nenryofunshaseigyosochi
DE2551688A1 (de) * 1975-11-18 1977-06-02 Bosch Gmbh Robert Kraftstoffeinspritzeinrichtung fuer brennkraftmaschinen
DE2551639A1 (de) * 1975-11-18 1977-06-02 Bosch Gmbh Robert Vorrichtung zur bestimmung der dauer von einspritzsteuerbefehlen bei einer kraftstoffeinspritzanlage fuer brennkraftmaschinen
DE2633617C2 (de) * 1976-07-27 1986-09-25 Robert Bosch Gmbh, 7000 Stuttgart Verfahren und Vorrichtung zur Bestimmung von Einstellgrößen bei einer Brennkraftmaschine, insbesondere der Dauer von Kraftstoffeinspritzimpulsen, des Zündwinkels, der Abgasrückführrate
JPS52129834A (en) * 1977-03-24 1977-10-31 Nippon Denso Co Ltd Air fuel ratio feedback controller
JPS52129835A (en) * 1977-03-24 1977-10-31 Nippon Denso Co Ltd Air fuel ratio feedback device
JPS6014907Y2 (ja) * 1977-06-15 1985-05-11 マツダ株式会社 エンジンの燃料噴射制御装置
JPS5458112A (en) * 1977-10-19 1979-05-10 Hitachi Ltd Electronic controller for internal combustion engine
CA1119493A (en) * 1978-07-21 1982-03-09 Mamoru Fujieda Fuel injection system for internal combustion engine
JPS5540226A (en) * 1978-09-14 1980-03-21 Hitachi Ltd Acceleration control method for automobile engine
JPS56107930A (en) * 1980-12-12 1981-08-27 Nippon Denso Co Ltd Method of feedback control of air-fuel ratio
JPS5882039A (ja) * 1981-11-11 1983-05-17 Hitachi Ltd 内燃機関用空気燃料比制御装置
JPS59208143A (ja) * 1983-05-13 1984-11-26 Hitachi Ltd 内燃機関に供給される燃料の制御方法

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US3738339A (en) * 1971-12-06 1973-06-12 Gen Motors Corp Electronic ignition spark advance system
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US3786788A (en) * 1972-05-24 1974-01-22 Nippon Denso Co Fuel injection apparatus for internal combustion engine
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US3720193A (en) * 1967-11-27 1973-03-13 Sopromi Soc Proc Modern Inject Method and apparatus for coding and reading data governing the duration of energization of fuel injection in an internal combustion engine
US3689755A (en) * 1969-09-23 1972-09-05 Lucas Industries Ltd Engine control systems
US3816717A (en) * 1970-03-20 1974-06-11 Nippon Denso Co Electrical fuel control system for internal combustion engines
US3752139A (en) * 1971-11-23 1973-08-14 Gte Sylvania Inc Electronic ignition timing system for internal combustion engines
US3738339A (en) * 1971-12-06 1973-06-12 Gen Motors Corp Electronic ignition spark advance system
US3780711A (en) * 1971-12-16 1973-12-25 Acf Ind Inc Electronic fuel injection system
US3786788A (en) * 1972-05-24 1974-01-22 Nippon Denso Co Fuel injection apparatus for internal combustion engine

Cited By (40)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3946709A (en) * 1973-10-17 1976-03-30 Societe Des Procedes Modernes D'inject Sopromi Tachometric and angular programming system for rotary device
US3983851A (en) * 1974-03-18 1976-10-05 Hitachi, Ltd. Electronic fuel injection apparatus
US4020802A (en) * 1974-03-21 1977-05-03 Nippon Soken, Inc. Fuel injection system for internal combustion engine
US3971348A (en) * 1974-05-08 1976-07-27 International Harvester Company Computer means for sequential fuel injection
US3991727A (en) * 1974-06-14 1976-11-16 Nippon Soken, Inc. Electronically controlled fuel injection system
US3960120A (en) * 1974-06-21 1976-06-01 Nisan Motor Co., Ltd. Electronic fuel injection control circuit for an internal combustion engine
US4031866A (en) * 1974-07-24 1977-06-28 Nissan Motor Co., Ltd. Closed loop electronic fuel injection control unit
US4172433A (en) * 1974-12-05 1979-10-30 Robert Bosch Gmbh Process and apparatus for fuel-mixture preparation
US4173952A (en) * 1975-04-24 1979-11-13 Nissan Motor Company, Limited Closed-loop mixture control system for an internal combustion engine with improved response characteristic to idling condition
US4199812A (en) * 1975-11-18 1980-04-22 Robert Bosch Gmbh Apparatus for determining the duration of fuel injection control pulses
US4026251A (en) * 1975-11-26 1977-05-31 Pennsylvania Research Corporation Adaptive control system for power producing machines
US4121553A (en) * 1976-03-12 1978-10-24 Nippondenso Co., Ltd. Electric ignition advance system
US4060714A (en) * 1976-05-20 1977-11-29 Chrysler Corporation Input sensor circuit for a digital engine controller
US4188922A (en) * 1976-11-16 1980-02-19 Toyota Jidosha Kogyo Kabushiki Kaisha Digital control device for a fuel injection system of an internal combustion engine
US4176629A (en) * 1976-12-10 1979-12-04 Nippon Soken, Inc. Electric control method for fuel injection and ignition timing
US4201159A (en) * 1977-03-23 1980-05-06 Nippon Soken, Inc. Electronic control method and apparatus for combustion engines
US4155332A (en) * 1977-05-18 1979-05-22 Toyota Jidosha Kogyo Kabushiki Kaisha Electronic fuel injection system in an internal combustion engine
US4134368A (en) * 1977-06-06 1979-01-16 Edelbrock-Hadley Corporation Fuel injection control system
US4080940A (en) * 1977-06-23 1978-03-28 Caterpillar Tractor Co. Engine control
USRE30928E (en) * 1977-06-23 1982-05-11 Caterpillar Tractor Co. Engine control
US4276601A (en) * 1977-09-21 1981-06-30 Hitachi, Ltd. Electronic engine control apparatus
USRE32140E (en) * 1977-09-21 1986-05-06 Hitachi, Ltd. Electronic engine control apparatus
US4223644A (en) * 1977-11-11 1980-09-23 Robert Bosch Gmbh Method and apparatus for controlling operational variables of an internal combustion engine
US4359991A (en) * 1978-01-28 1982-11-23 Robert Bosch Gmbh Method and apparatus for fuel metering in internal combustion engines
US4250858A (en) * 1978-08-09 1981-02-17 Robert Bosch Gmbh Input-output unit for microprocessor controlled ignition or injection systems in internal combustion engines
US4334513A (en) * 1979-06-29 1982-06-15 Nissan Motor Co., Ltd. Electronic fuel injection system for internal combustion engine
US4363307A (en) * 1980-03-07 1982-12-14 Hitachi, Ltd. Method for adjusting the supply of fuel to an internal combustion engine for an acceleration condition
US4548178A (en) * 1982-11-22 1985-10-22 Toyota Jidosha Kabushiki Kaisha Method and apparatus for controlling the air-fuel ratio in an internal-combustion engine
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Also Published As

Publication number Publication date
DE2226949C3 (de) 1981-10-01
JPS4956033A (ja) 1974-05-30
JPS6014184B2 (ja) 1985-04-11
DE2226949B2 (ja) 1981-03-12
GB1395457A (en) 1975-05-29
IT988897B (it) 1975-04-30
FR2189635B1 (ja) 1978-02-17
FR2189635A1 (ja) 1974-01-25
DE2226949A1 (de) 1973-12-20

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