Automatic choke

Details Automatic choke Automatic choke

2006-10-10

2006-10-10

Cronin, Stephen K. (Department: 3747)

Internal-combustion engines

Starting device

With fuel or intake air control

Reexamination Certificate

active

07117834

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 motor11. A choke valve opening degree upon start of engine (start opening degree) is determined depending on the engine temperature. The start opening degree judging unit27judges whether the start opening degree is closer to the fully closed side or fully opened side. The motor initializing unit28initializes the stepping motor11at the fully closed side or the fully opened side if the start opening degree is at the fully closed side or the fully opened side, respectively. After choke release, a driving signal in a specified number of steps is issued periodically.

REFERENCES:
patent: 4200064 (1980-04-01), Engele
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: 5-280425 (1993-10-01), None

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