Speedometer tester

Details Speedometer tester Speedometer tester

1978-09-05

1980-01-29

Swisher, S. Clement

Measuring and testing

Instrument proving or calibrating

Volume of flow, speed of flow, volume rate of flow, or mass...

G01P 2102

Patent

active

041854896

ABSTRACT:
The speedometer of a stationary vehicle is evaluated for accuracy and calibrated regardless of vehicle tire size. The powered driven wheel or wheels is/are disengaged from road contact and a detachable housing member with a permanent magnet therein is releasably threaded onto the tire valve stem. A sensor associated with a testing unit is positioned adjacent the housing member so that as the wheels are driven at selected speeds, as indicated by the vehicle speedometer, a train of electrical pulses derived from the sensor is delivered to the testing unit at a rate proportional to the wheel rotative speed. This pulse information, in conjunction with a compensated reference signal generated by a scaler circuit, is processed by computing circuitry in the testing unit resulting in a digital display indicating the actual vehicle speed. The scaler circuit includes a tire size selector providing the testing unit with a number of reference frequencies corresponding to a range of selectable tire sizes.

REFERENCES:
patent: 3435657 (1969-04-01), Weissman
patent: 3626766 (1971-12-01), Waldecker
patent: 3710246 (1973-01-01), Herring
patent: 3898563 (1975-08-01), Erisman
patent: 4083423 (1978-04-01), Williams et al.

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