Compression ratio measurement

Details Compression ratio measurement Compression ratio measurement

1997-02-27

1998-07-28

Chilcot, Richard

Measuring and testing

Test stand

For engine

73 47, 73 497, G01M 1500

Patent

active

057865310

ABSTRACT:
Internal combustion engine cylinder compression ratio measurement is provided by applying a train of pressure pulses to an engine cylinder, measuring time rate of change in pressure within the cylinder and estimating a volume of air within the cylinder from the measured time rate of change. The cylinder air volume may be compensated for such effects as change in cylinder air temperature away from a calibration temperature or cylinder leakage. The time rate of change in pressure is measured at an engine angular position corresponding to a known volume within the cylinder, for example an engine angular position corresponding to the cylinder top dead center position, and cylinder compression ratio is determined from the estimated volume of air in the cylinder and the known cylinder volume.

REFERENCES:
patent: 4505152 (1985-03-01), Haddox
patent: 4633707 (1987-01-01), Haddox
patent: 4836015 (1989-06-01), Krage
patent: 5203822 (1993-04-01), Gurich et al.
patent: 5417109 (1995-05-01), Scourtes

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