Patent ID: 6070567
Filing Date: 2000-06-06
Classification: F02D,F02P,G01M,Y02T

Abstract:
An apparatus for measuring acceleration corresponding to power strokes of individual cylinders of an internal combustion engine, comprising:a position sensor providing position signals at predetermined points of the rotation of the engine's crankshaft, said predetermined points being at regularly spaced rotation angles such that at least one position signal occurs during every power stroke;a device, connected to said sensor, measuring a first time period of rotation through a first rotation interval defined by first selected position signals separated by a first angle of rotation and measuring a second time period of rotation through a second rotation interval defined by second selected position signals separated by a second angle of rotation, and measuring a third time period of rotation between said first and second rotation intervals, each of said first and second rotation intervals including a selected power stroke,said device calculating a first instantaneous speed as a function of said first measured time period and calculating a second instantaneous speed as a function of said second measured time period,said device calculating a ratio of the difference between said first and second calculated instantaneous speeds to said third measured time period,said device determining the acceleration based on said calculated ratio; anda second sensor providing reference marker signals at second predetermined points of rotation of the engine's crankshaft, said second predetermined points being at regularly spaced rotation angles such that one reference signal occurs during every power stroke.