Selection of velocity interval for power stroke acceleration mea

Details Selection of velocity interval for power stroke acceleration mea Selection of velocity interval for power stroke acceleration mea

1990-08-24

1991-10-15

Raevis, Robert

Measuring and testing

Test stand

For engine

G01M 1500

Patent

active

050563602

ABSTRACT:
Engine crankshaft velocity is determined during each firing interval of an engine. Pairs of velocities are combined to yield acceleration measurements indicating the work done by a particular cylinder in its power stroke. A deviation of a particular acceleration value from that of neighboring values denotes a lack of power in the corresponding cylinder. The width and the phase of each velocity interval are used which provide accurate and substantially independent acceleration measures for each power stroke. Specifically, the width of each interval is preferably between about 45.degree.-180.degree. of engine rotation. Each interval has a phase in relation to its respective power stroke such that the drop in acceleration occurring in a particular power stroke causes a maximum drop in the calculated acceleration corresponding to that particular power stroke and causes a smaller but substantially equal drop in the calculated accelerations corresponding to the preceding and following power strokes. The velocity measurement intervals can be defined by position reference marking signals generated at rotational positions corresponding to a point within the power strokes where a maximum acceleration would approximately occur during a proper firing of the power stroke.

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James et al, "Microprocessor Based Data Acquisition for Analysis of Engine Performance", SAE Tech. Paper Series, No. 870386, Feb. 1987.

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