Idle running control apparatus for internal combustion engine

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

1991-11-13

1992-12-22

Argenbright, Tony M.

Internal-combustion engines

Engine speed regulator

Idle speed control

F02D 4116

Patent

active

051726653

ABSTRACT:
An idle running control apparatus for an internal combustion engine includes sensors for sensing the rotational speed or angular velocity of the engine, the opening degree of a throttle valve and the flow rate of intake air sucked into the engine, respectively. A misfiring determiner determines an occurrence of misfiring in the engine when a change in magnitude of the engine rotational speed exceeds a predetermined value. An idle speed adjuster adjusts the flow rate of intake air bypassing the throttle valve during idling so as to properly adjust the idle running speed of the engine. A controller is responsive to the outputs of the detectors and the misfiring determiner for controlling the idle running speed adjuster through feedback control with a control gain previously set such that a desired engine rotational speed is thereby attained. Upon occurrence of misfiring, in one aspect of the invention, the controller decreases the control gain so that the idle speed adjuster is thereby controlled to increase the idle running speed. In another aspect, the controller sets the desired rotational speed to a higher or greater value. Thus, hunting and an engine stall during the idle running operation of the engine can be prevented.

REFERENCES:
patent: 4376427 (1983-03-01), Mizuno
patent: 5035220 (1991-07-01), Uchinami et al.
patent: 5080061 (1992-01-01), Nishimura

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