Idle air control apparatus for internal combustion engine

Details Idle air control apparatus for internal combustion engine Idle air control apparatus for internal combustion engine

1981-04-02

1982-07-06

Cuchlinski, Jr., William A.

Internal-combustion engines

Engine speed regulator

Idle speed control

123350, 123585, F02M 300, F02M 2304

Patent

active

043377424

ABSTRACT:
Idle air control apparatus for a vehicle driving internal combustion engine having an air induction passage includes a control valve in the air induction passage controlled by a stepper motor in response to the arithmetic count of applied electrical pulses, a register effective to store a valve control number representing the currently desired position of the control valve, apparatus effective upon occurrence of a predetermined engine loading event to change the valve control number in response thereto, an up-down counter effective to arithmetically count the pulses applied to the stepper motor and thus indicate actual control valve position, a closed loop control effective to compare the contents of the up-down counter and register and apply pulses to the stepper motor at the first predetermined rate to reduce any difference therebetween and a speed trim loop active only during occurrence of a predetermined steady state idle condition to compare actual engine speed with the desired engine idle speed and arithmetically change the valve control number in the register at a second predetermined rate substantially slower than the first predetermined rate to reduce any difference between said speeds. Thus idle air control responds to large, sudden engine load changes and environmental factors to prevent engine stall but ignores small random speed fluctuations to maintain a stable engine idle.

REFERENCES:
patent: 3575256 (1971-04-01), Jania et al.
patent: 3700996 (1972-10-01), Gutting
patent: 3964457 (1976-06-01), Coscia
patent: 4245599 (1981-01-01), Des Lauriers
patent: 4285319 (1981-08-01), Hattori et al.
patent: 4296722 (1981-10-01), Furuhashi et al.
patent: 4303048 (1981-12-01), Nishio
patent: 4305360 (1981-12-01), Meyer et al.

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