US3822679A — Fuel control system for fuel injection type inter…

Claim 1

Independent Claim 360 words

A fuel control system for a fuel injection type internal combustion engine comprising a fluid servo motor including an actuator chamber having a Movable wall connected to a fuel injection quantity controlling element of a fuel injection pump for the engine, a forward controlling electromagnetic valve provided in a passage connecting said actuator chamber to a high pressure fluid source, and a reverse controlling electromagnetic valve provided in a passage connecting said actuator chamber to a low pressure exhaust; an operating condition detector for detecting operating conditions of the engine to generate electrical operating condition signals; a control voltage generator for receiving said operating condition signals to generate a control voltage corresponding to a predetermined quantity of fuel injected to the engine; a position voltage generator for generating a position voltage corresponding to the position of said fuel injection quantity controlling element; a comparator for comparing said control voltage with said position voltage to generate an output voltage corresponding to the difference between said voltages; and a forward controlling electromagnetic valve driving circuit and a reverse controlling electromagnetic valve driving circuit selectively responsive to said output voltage of said comparator to generate an electrical output for selectively opening said forward controlling electromagnetic valve and said reverse controlling electromagnetic valve of said fluid servo motor, wherein said operating condition detector comprises speed detecting means for generating a voltage proportional to the rotational speed of the engine and acceleration detecting means for generating a voltage corresponding to the position of the accelerator; and said control voltage generator comprises start-idling control voltage generating means connected to said speed detecting means and having an operational amplifier for generating an output voltage corresponding to the starting enrichment fuel injection quantity, full load-part load voltage generating means connected to said acceleration detecting means and said speed detecting means having an operational amplifier for generating an output voltage corresponding to the full load fuel injection quantity, and upperlimit selection circuit means connected to said start-idling control voltage generating means and said full load-part load voltage generating means for generating a voltage equal to the value of either of said output voltages whichever is greater than the other.

Claim 2

Dependent Claim 360 words

A fuel control system for a fuel injection type internal combustion engine comprising a fluid servo motor including an actuator chamber having a Movable wall connected to a fuel injection quantity controlling element of a fuel injection pump for the engine, a forward controlling electromagnetic valve provided in a passage connecting said actuator chamber to a high pressure fluid source, and a reverse controlling electromagnetic valve provided in a passage connecting said actuator chamber to a low pressure exhaust; an operating condition detector for detecting operating conditions of the engine to generate electrical operating condition signals; a control voltage generator for receiving said operating condition signals to generate a control voltage corresponding to a predetermined quantity of fuel injected to the engine; a position voltage generator for generating a position voltage corresponding to the position of said fuel injection quantity controlling element; a comparator for comparing said control voltage with said position voltage to generate an output voltage corresponding to the difference between said voltages; and a forward controlling electromagnetic valve driving circuit and a reverse controlling electromagnetic valve driving circuit selectively responsive to said output voltage of said comparator to generate an electrical output for selectively opening said forward controlling electromagnetic valve and said reverse controlling electromagnetic valve of said fluid servo motor, wherein said operating condition detector comprises speed detecting means for generating a voltage proportional to the rotational speed of the engine and acceleration detecting means for generating a voltage corresponding to the position of the accelerator; and said control voltage generator comprises start-idling control voltage generating means connected to said speed detecting means and having an operational amplifier for generating an output voltage corresponding to the starting enrichment fuel injection quantity, full load-part load voltage generating means connected to said acceleration detecting means and said speed detecting means having an operational amplifier for generating an output voltage corresponding to the full load fuel injection quantity, and upperlimit selection circuit means connected to said start-idling control voltage generating means and said full load-part load voltage generating means for generating a voltage equal to the value of either of said output voltages whichever is greater than the other.

Claim 3

Dependent Claim 255 words

A fuel control system for a fuel injection type internal combustion engine according to claim 1, wherein said fluid servo motor comprises a pair of movable walls reciprocatingly mounted in said actuator chamber and fixedly supported and spaced away from each other by a connecting rod connectable to said fuel injection quantity controlling element, a first fluid chamber defined between one of said pair of movable walls and one of the inner wall ends of said actuator chamber, a second fluid chamber defined between the other of said pair of movable walls and the other of said inner wall ends of said actuator chamber, a first forward controlling electromagnetic valve provided in a passage connecting said first fluid chamber to said high pressure fluid source and a second reverse controlling electromagnetic valve provided in a passage connecting said first fluid chamber to a low pressure exhaust, and a first reverse controlling electromagnetic valve provided in a passage connecting said second fluid chamber to said high pressure fluid source and a second forward controlling electromagnetic valve provided in a passage connecting said second fluid chamber to said low pressure exhaust, whereby when only said first and second forward controlling electromagnetic valves are opened, said pair of movable walls are moved in the direction which causes said fuel injection quantity controlling element to effect a forward control, whereas when only said first and second reverse controlling electromagnetic valves are opened, said pair of movable walls are moved in the direction opposite to said forward controlling direction. >

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1977-07-08	1978-01-07	1978-07-09	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1981-07-08	1982-01-07	1982-07-09	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1985-07-08	1986-01-07	1986-07-09	$7700.00	Window Closed / Lapsed

Fuel control system for fuel injection type internal combustion engine

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