Sub-cyclic measurements of speed and time for internal combustio

Details Sub-cyclic measurements of speed and time for internal combustio Sub-cyclic measurements of speed and time for internal combustio

1976-05-07

1977-04-05

Gill, James J.

Measuring and testing

Test stand

For engine

G01L 526

Patent

active

040154670

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 speed is continuously compared against an upper reference speed during the interval that the timer is running, and when the upper reference speed is reached, the timer is stopped. In a second embodiment, the interval of the timer is fixed, and instantaneous speed is measured at time-out. In either instance, the starting speed, the stopping speed, and the elapsed time are all accurately related and may be utilized in accordance with known techniques for computing factors relating to torque and horsepower.

REFERENCES:
patent: 3964301 (1976-06-01), Hanson
B569,859, Mar. 1976, Hanson, 73/116.

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