Throttle control system for vehicular internal combustion engine

Details Throttle control system for vehicular internal combustion engine Throttle control system for vehicular internal combustion engine

1989-07-26

1991-03-26

Nelli, Raymond A.

Internal-combustion engines

Engine speed regulator

Open loop condition responsive

123340, F02D 700

Patent

active

050020285

ABSTRACT:
Throttle control system for a vehicular internal combustion engine equipped with a stepper motor connected to a throttle valve provided at an engine air intake passage, wherein the position (the opening degree) of the throttle valve is controlled by the stepper motor in response to the vehicular engine operation. In one embodiment, various throttle positions are once determined including positions for engine idling and vehicle cruising and the largest of the positions is selected for optimally satisfying the whole operating condition. In another embodiment, when the engine is idling, the throttle valve is controlled such that engine speed converges toward a target speed. In the other embodiment, the stepper motor is varied its pulse rate and chopping duty for optimally control the throttle position according to the vehicular engine operation.

REFERENCES:
patent: 4691677 (1987-09-01), Hotate et al.
patent: 4760825 (1988-08-01), Morita
patent: 4765295 (1988-08-01), Ishikawa et al.
patent: 4765296 (1988-08-01), Ishikawa et al.
patent: 4791902 (1988-12-01), Ishikawa et al.
Patent Abstract of JP Publication No. 60138246 & 63109258 (in English).

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