Measuring and testing – Vehicle chassis – Steering
Patent
1982-09-13
1985-03-19
Myracle, Jerry W.
Measuring and testing
Vehicle chassis
Steering
73115, G01M 1500
Patent
active
045051526
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, including the TDC position. 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 then determined using the constants .gamma. and k and the measured pressure at TDC. Compression ratio is then 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.
REFERENCES:
patent: 2202220 (1940-05-01), Miller
patent: 2427370 (1947-09-01), Schweitzer
patent: 2735296 (1956-02-01), Traver
patent: 2800014 (1957-07-01), Welch et al.
patent: 3495451 (1970-02-01), Verhoef
patent: 3964301 (1976-06-01), Hanson et al.
patent: 4036049 (1977-07-01), Hanson
patent: 4228679 (1980-10-01), Alt et al.
patent: 4325128 (1982-04-01), Abnett et al.
patent: 4331029 (1982-05-01), Wilson
Weinert, "Pneumatic and Sonic Measurement of Combustion-Chamber Volume", SAE Transactions, vol. 64, pp. 50-58, (1956).
Lancaster et al., "Measurement and Analysis of Engine Pressure Data", SAE Paper No. 750026 (1975).
Taylor, The Internal-Combustion Engine in Theory and Practice, M.I.T. Press, vol. I (2nd Ed., 1966), pp. 26-27 and 216-217, and vol. II (1968) pp. 104-105 and 156-157.
Jodon Engineering Associates, Inc.
Myracle Jerry W.
LandOfFree
Method and apparatus for measuring engine compression ratio does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for measuring engine compression ratio, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for measuring engine compression ratio will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-747014