Testing compression in engines from starter motor current wavefo

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

1976-10-12

1977-12-13

Myracle, Jerry W.

Measuring and testing

Vehicle chassis

Steering

G01M 1500

Patent

active

040622320

ABSTRACT:
The relative compression in the cylinders of 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 percent or more.

REFERENCES:
patent: 3765233 (1973-10-01), Germann
patent: 3952586 (1976-04-01), Hanson et al.

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