Electronic ignition signal distributor for automobile engine
AssigneeHitachi, Ltd.
InventorsShoji Sasaki, Kenji Tabuchi
Life of this patent
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Abstract
Disclosed is an electronic ignition signal distributor for automobile engine, in which cylinders of the engine are identified using an ignition sequence counter and basing on the reference position signal and crank angle signal. The cylinder identity signal is taken AND with the distributed ignition position signal before being applied to the ignition device, thereby preventing the delivery of an active ignition signal in the event of a malfunctioning of the counter or cylinder identifying circuit, and ultimately preventing an erroneous ignition of irrelevant cylinders caused by a noise or the like.
Claims5
An electronic ignition signal distributor for a multi-cylinder engine comprising:
- a reference position detector coupled to the output shaft of said engine for detecting the position of each cylinder;
- a crank angle detector coupled to the ouptut shaft of said engine for detecting the rotational angle of said engine;
- an ignition signal producing means which receives the output signals of said two detectors and produces an ignition signal by calculating an optimal igntiion timing and current conduction time length applied to ignition coils of the cylinders;
- cylinder signal generating means which produces, from the output signals of said two detectors, a reference cylinder signal which provides the reference of ignition sequence and cylinder signals indicative of a cylinder to be ignited;
- reference cylinder signal distributing means which receives the reference cylinder signal and ignition signal and produces ignition position signals;
- means for producing cylinder ignition signals from the cylinder signals;
- logical-product means which implement logical-product operations among groups of the ignition position signals, the ignition signal and the cylinder ignition signals;
- and ignition circuits which receive outputs of said logical-product means.
Dependencies are inferred from the claim text.