Sub-cyclic speed and cyclic time measurements for internal combu

Details Sub-cyclic speed and cyclic time measurements for internal combu Sub-cyclic speed and cyclic time measurements for internal combu

1976-05-07

1977-04-12

Gill, James J.

Measuring and testing

Test stand

For engine

G01L 526

Patent

active

040167534

ABSTRACT:
Indications of speed of an internal combustion engine are derived from an engine member rotating directly with the crankshaft, such as the teeth on the flywheel, so as to provide indications for speed measurements on a sub-cycle basis (that is, many times during each revolution), a timer is started after a threshold speed is reached as determined by comparison with the sub-cyclic speed indications, and a measurement of speed is made contemporaneously with starting the counter; after an elapsed time interval which may be on the order of several cycles, which is determined by the acceleration of the engine, the timer is stopped and the speed is once again measured. In one embodiment, the timer is allowed to run through a known large angle of revolution of the engine, such as several cycles, as is determined by counting successive signals indicating a particular cyclic angular position of the engine, after which the timer is stopped and the speed is measured contemporaneously therewith. The starting speed, the stopping speed, and the elapsed time are all accurately related and may be utlized in accordance with known techniques for computing factors relating to torque and horsepower.

REFERENCES:
patent: 3964301 (1976-06-01), Hanson
569,859, Mar., 1976, Hanson, 73/116.

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