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Hitachi Ltd
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Hitachi Ltd
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Priority to JP8178976ApriorityCriticalpatent/JPS537280A/en
Publication of JPS537280ApublicationCriticalpatent/JPS537280A/en
Ignition Installations For Internal Combustion Engines
(AREA)
Abstract
PURPOSE: To detect the number of revolutions in quick response and with high accuracy by establishing a saw-tooth waveform voltage for each spark signal of an internal combustion engine and by comparing the saw-tooth waveform voltage with a refe rence voltage which corresponds to the number of revolutions (or frequency) to be detected.