Methods and apparatus for an ignition system
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United States of America Patent
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Sep 21, 2021
Grant Date -
Jun 20, 2019
app pub date -
Dec 18, 2017
filing date -
Dec 18, 2017
priority date (Note) -
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Abstract
Various embodiments of the present technology comprise a method and apparatus for an ignition system. In various embodiments, the ignition system activates a soft shutdown of an ignition coil in the event of an over dwell condition. The apparatus comprises a first counter and a second counter that are selectively activated at predetermined events. An output of the second counter controls the value of a reference current that decreases linearly over time and wherein a rate of change of the reference current may be adjusted according to a frequency of a clock signal. In various embodiments, the soft shutdown operates independent of the supply voltage and temperature.
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