Measuring and testing – With fluid pressure – Leakage
Patent
1984-08-31
1987-01-06
Myracle, Jerry W.
Measuring and testing
With fluid pressure
Leakage
73115, 731173, 73119R, G01M 1500
Patent
active
046337075
ABSTRACT:
A method and apparatus for measuring compression ratio and/or clearance volume in an internal combustion engine cylinder wherein the crankshaft angle associated with piston top dead center position is obtained and cylinder pressure is measured at a number of incrementally spaced piston positions. Changes in cylinder volume between the incrementally spaced piston positions are determined from nominal engine design parameters. These multiple pressure and volume figures are then employed in a programmed microprocessor to determine the constants .gamma. and k in the polytropic equation for relating cylinder pressure to volume PV.sup..gamma. =k. Clearance volume V.sub.TDC is determined using the constants .gamma. and k, and measured pressure at TDC or incremental volume figures. Compression ratio is determined by the fraction (V.sub.DP +V.sub.TDC)/V.sub.TDC, where V.sub.DP is total piston displacement volume obtained from nominal engine design parameters. The invention is also implemented to determine cylinder leakage during the compression stroke, angles of operation of the intake and exhaust valves, effective compression ratio where the intake valve does not close at BDC, and/or cylinder intake pressure.
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Jodon Engineering Associates, Inc.
Myracle Jerry W.
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