Spark blanking apparatus for an internal combustion engine
AssigneeBriggs & Stratton Corporation
InventorsRichard A. Dykstra, Robert K. Mitchell, Gary J. Gracyalny
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Abstract
A spark prevention apparatus during the exhaust stroke of a four-stroke-cycle internal combustion engine is claimed. A valve operating assembly operates an intake or an exhaust valve. A switch is electrically connected to a primary winding of the engine and actuated by the valve operating assembly such that either the primary winding is electrically connected to ground during the exhaust stroke or the primary winding is electrically connected to an energy storage device during the exhaust stroke.
Claims21
A four stroke cycle internal combustion engine, each cycle having a compression stroke and an exhaust stroke, and said engine having an ignition primary winding, comprising:
- a rotatable cam shaft;
- a switch electrically interconnected with the primary winding and mechanically interconnected with said cam shaft, that actuates in timed relation to the rotation of said cam shaft such that at least one of:
- (a) the primary winding is electrically connected to ground during an exhaust stroke;
- (b) the primary winding is electrically connected to an energy storage device during an exhaust stroke;
- and (c) the primary winding is electrically connected to a load.
Dependencies are inferred from the claim text.