Automatic choke

Details Automatic choke Automatic choke

2007-05-08

2007-05-08

Kamen, Noah P. (Department: 3747)

Internal-combustion engines

Starting device

With fuel or intake air control

C261S039100, C261S064600, C123S339150

Reexamination Certificate

active

11075728

ABSTRACT:
A choke valve is controlled finely suited to the running state of an engine. A throttle valve8and a choke valve9are provided in series on an intake pipe6, and the opening degree of the choke valve9is controlled by a stepping motor. The choke valve opening degree upon start of engine (start opening degree) is determined depending on the engine temperature. The stepping motor11is initialized at the fully closed side of the choke valve9when the power source for starting the engine is turned on. The start opening degree of the choke valve is judged to be closer to the fully closed side or fully opened side, and the stepping motor11is initialized at the fully closed side if judged to be close to the fully closed side, and at the fully opened side if at the fully opened side.

REFERENCES:
patent: 3948240 (1976-04-01), Hirosawa et al.
patent: 4011844 (1977-03-01), Hirosawa et al.
patent: 4321902 (1982-03-01), Stoltman
patent: 4463723 (1984-08-01), Tansuwan
patent: 4524742 (1985-06-01), Bonfiglioli et al.
patent: 4623322 (1986-11-01), Melchior
patent: 02238162 (1990-09-01), None
patent: 2-280425 (1993-10-01), None

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