Absolute compression test

Details Absolute compression test Absolute compression test

1984-12-03

1986-01-07

Kreitman, Stephen A.

Measuring and testing

Test stand

For engine

364551, G01M 1500

Patent

active

045627282

ABSTRACT:
A method and apparatus for determining the absolute compression pressure of each cylinder in an internal combustion engine is disclosed. The technique involves analyzing the changes in engine kinetic energy in order to calculate both the work of compression and expansion of each cylinder in a multi-cylinder engine typically during a decelerating engine cycle. Speed data is obtained and the work associated with the compression and expansion process for each cylinder is calculated and compared to the compression and expansion data of a good engine which is stored in computer memory. If a compression fault is present, it can be detected because that cylinder will display a decrease in both the work of compression and expansion. Once a faulted cylinder has been identified, the magnitude of the fault can be calculated and normalized and the compression pressure of each cylinder calculated and displayed.

REFERENCES:
patent: 4050296 (1977-09-01), Benedict
patent: 4292670 (1981-09-01), Reid et al.
patent: 4348893 (1982-09-01), Hendrix et al.

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