Protective engine speed control for a centrifugal clutch

Details Protective engine speed control for a centrifugal clutch Protective engine speed control for a centrifugal clutch

2007-02-06

2007-02-06

Wolfe, Jr., Willis R. (Department: 3747)

Internal-combustion engines

Engine speed regulator

Engine speed reduction by partial or complete omission of...

C123S350000, C123S406590, C477S181000

Reexamination Certificate

active

11163364

ABSTRACT:
A device that controls the engine speed of an internal combustion engine of a hand-held power tool has a protective control unit. The engine has an ignition control unit for controlling the ignition timing relative to a crank angle of a crankshaft based on the crankshaft speed and also has a centrifugal clutch driven by the crankshaft that begins to engage when a first engine speed is surpassed and is fully engaged when a second engine speed is reached. The protective control unit is activated within an engine speed range between the first and second engine speeds and monitors a dwell time of the actual engine speed within the engine speed range. When a predetermined dwell time of the actual engine speed is surpassed, the protective control unit intervenes in the combustion process and corrects the engine speed to a value that is outside of the engine speed range.

REFERENCES:
patent: 4106605 (1978-08-01), Winchell
patent: 4336778 (1982-06-01), Howard
patent: 4630590 (1986-12-01), Kondo et al.
patent: 4662071 (1987-05-01), Hoppner et al.
patent: 4696150 (1987-09-01), Geeck, III
patent: 7048670 (2006-05-01), Isoda et al.
patent: 61192935 (1986-08-01), None

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