Testing compression in engines from starter motor current...

Details Testing compression in engines from starter motor current... Testing compression in engines from starter motor current...

G - Physics

01

M

324/17

G01M 15/00 (2006.01) G01L 23/08 (2006.01)

Patent

CA 1069178

Abstract The relative compression in the cylinders or an internal combustion engine is tested by analyzing the starter motor current waveform when the engine is cranked with the ignition or the fuel inhibited. In asymmetrical engines, where the compression strokes of individual cylinders are unequally spaced in time, the starter current waveform may contain double-hump cycles. The area under each double-hump cycle is integrated, and the integration peaks are compared. The compression in one or more cylinders is deficient if the minimum integration peak is less than the maximum integration peak by a significant percentage such as 15 per cent or more.

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