ELECTRONIC FUEL INJECTION CONTROL SYSTEM
First Claim
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1. An electronic fuel injection control system for an engine, the engine having a fuel injection valve and a synchronizing signal generator to generate an electric synchronizing signal, said control system comprising;
- a first sensor to sense a primary operating parameter of the engine and generate an electric primary analog signal analogous thereto;
a second sensor to sense at least one secondary operating parameter of the engine and generate an electric secondary analog signal analogous thereto;
a primary pulse generator responsive to said primary analog signal to generate an electric primary pulse signal having a pulse width analogous thereto;
a secondary pulse generator responsive to said secondary analog signal to generate an electric secondary pulse signal having a pulse width analogous thereto;
a pulse train generator responsive to said primary and secondary pulse signals being operative to alternately generate primary and secondary pulse train signals respectively, said primary pulse train signal having a first number of pulses which is a first predetermined function of the pulse width of said primary pulse signal, and said secondary pulse train signal having a second number of pulses which is a second predetermined function of the pulse width of said secondary pulse signal;
a variable clock pulse generator responsive to said secondary pulse train signal to generate clock pulses at a frequency which is a third predetermined function of said second number of pulses;
a counter responsive to the synchronizing signal, said primary pulse train signal, and said clock pulses, being operative to count said first number of pulses at the frequency of said clock pulses, the counting operation commencing when said synchronizing signal is received; and
an injection pulse generator connected to said counter and operative to generate an injection pulse signal to open the fuel injection valve for the duration of the counting operation of said counter.
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Abstract
An injection valve control signal is generated having a pulse width which is a primary function of sensed intake vacuum, and a secondary function of sensed engine speed, engine temperature, and throttle opening.
36 Citations
5 Claims
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1. An electronic fuel injection control system for an engine, the engine having a fuel injection valve and a synchronizing signal generator to generate an electric synchronizing signal, said control system comprising;
- a first sensor to sense a primary operating parameter of the engine and generate an electric primary analog signal analogous thereto;
a second sensor to sense at least one secondary operating parameter of the engine and generate an electric secondary analog signal analogous thereto;
a primary pulse generator responsive to said primary analog signal to generate an electric primary pulse signal having a pulse width analogous thereto;
a secondary pulse generator responsive to said secondary analog signal to generate an electric secondary pulse signal having a pulse width analogous thereto;
a pulse train generator responsive to said primary and secondary pulse signals being operative to alternately generate primary and secondary pulse train signals respectively, said primary pulse train signal having a first number of pulses which is a first predetermined function of the pulse width of said primary pulse signal, and said secondary pulse train signal having a second number of pulses which is a second predetermined function of the pulse width of said secondary pulse signal;
a variable clock pulse generator responsive to said secondary pulse train signal to generate clock pulses at a frequency which is a third predetermined function of said second number of pulses;
a counter responsive to the synchronizing signal, said primary pulse train signal, and said clock pulses, being operative to count said first number of pulses at the frequency of said clock pulses, the counting operation commencing when said synchronizing signal is received; and
an injection pulse generator connected to said counter and operative to generate an injection pulse signal to open the fuel injection valve for the duration of the counting operation of said counter.
- a first sensor to sense a primary operating parameter of the engine and generate an electric primary analog signal analogous thereto;
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2. A control system as claimed in claim 1, in which said primary operating parameter is the engine intake vacuum.
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3. A control system as claimed in claim 2, in which the engine further has a throttle valve, and in which said at least one secondary operating parameter is at least one of the engine temperature, the engine speed and the velocity of the throttle valve.
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4. A control system as claimed in clAim 3, which further comprises an acceleration compensation system being operative to lengthen the pulse width of said injection pulse signal in response to an acceleration demand condition of the engine.
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5. A control system as claimed in claim 4, which further comprises a fuel shut-off system operative to inhibit generation of said injection pulse signal in response to a sensed deceleration condition of the engine.
Specification
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Current AssigneeShigeo Aono
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Original AssigneeShigeo Aono
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InventorsAono, Shigeo
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Primary Examiner(s)Myhre, Charles J.
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Assistant Examiner(s)Flint, Cort
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Application NumberUS05/399,363Time in Patent Office473 DaysField of Search123/32EA,119RUS Class Current123/492CPC Class CodesF02D 41/123 the fuel injection being cu...F02D 41/2403 using essentially up/down c...
