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|1. (WO2018180814) STROKE DETERMINATION DEVICE FOR 4-STROKE ENGINE|
|Applicants:||MAHLE ELECTRIC DRIVES JAPAN CORPORATION
|Title:||STROKE DETERMINATION DEVICE FOR 4-STROKE ENGINE|
Provided is a stroke determination device which detects a secondary output from an ignition coil without using a high breakdown voltage element, and on the basis of the waveform of the detected secondary output, is capable of accurately determining the stroke being completed during the ignition operation of a 4-stroke engine. The present invention configures a secondary coil of an ignition coil from a first coil section and a second coil section which is connected in series to the first coil section and is wound so as to have fewer windings than does the first coil section. A tap is drawn from the boundary between the two coil sections, the voltage at both ends of the second coil section or the current flowing through the second coil section is detected via the tap, and a parameter to be used in stroke determination is detected on the basis of the waveform of the detected voltage or current.