Internal-combustion engines – High tension ignition system – Safety device
Patent
1989-04-13
1990-04-03
Wolfe, Willis R.
Internal-combustion engines
High tension ignition system
Safety device
123424, F02P 1102
Patent
active
049131249
ABSTRACT:
An ignition apparatus for an internal combustion engine started by rotation of the crank shaft in one direction by the driving of a starter. An ignition coil and an ignition plug connected to the ignition coil are provided to generate ignition sparks at a predetermined interval of time. A sensor senses first and second predetermined angular positions in one rotation of the crank shaft and the output of the sensor changes between first and second levels every time each of the angular positions is sensed. The ignition coil is energized during a period when the output of the sensor is at the first level and de-energized to generate a spark at the ignition plug at the time when the output of the sensor changes from the first level to the second level. In the event of the current flowing through the starter being cut off and the period during which the output of the sensor is hold at the first level exceeding a predetermined length of time, the ignition coil is controlled so that its condition is held unchanged or so that the flow of current therethrough gradually decreases, thereby preventing any spark from being generated at the ignition plug.
REFERENCES:
patent: 4080940 (1978-03-01), Fuzzell et al.
patent: 4198941 (1980-04-01), Oishi
patent: 4226219 (1980-10-01), Olmstead
patent: 4633834 (1987-01-01), Takeuchi et al.
Mitsubishi Denki & Kabushiki Kaisha
Wolfe Willis R.
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