Electricity: measuring and testing – Electrical speed measuring – Including speed-related frequency generator
Patent
1977-12-05
1979-06-12
Rolinec, Rudolph V.
Electricity: measuring and testing
Electrical speed measuring
Including speed-related frequency generator
324160, 324175, 235 92FQ, G01P 354
Patent
active
041581725
ABSTRACT:
A digital speedometer for indicating angular or linear velocity has an index counter to control update of the displayed velocity. The purpose of the index counter is to prevent undesirable fluctuation of the displayed velocity where minor variations in velocity being measured have occurred. The digital speedometer uses a pulsating input signal having a frequency proportional to the velocity to be indicated. An oscillator circuit provides a clock frequency that is utilized in generating a counting period electrical signal. During the counting period, the input pulses proportional to velocity are gated into a counter. After each counting period, a comparison is made between the count currently being displayed and the count stored in the counter. If a difference occurs, the index counter is incremented. Only after the index counter has been incremented a plurality of consecutive times is the display permitted to be updated.
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T. S. Mereness, "Bicycle Tachometer/Speedometer", IBM Technical Disclosure Bulletin, vol. 17, No. 9, Feb. 1975, pp. 2570-2571.
Boyer Curtis E.
Mosier Jacques
Brown Robert W.
Ford Motor Company
Rolinec Rudolph V.
Sadler Clifford L.
Snow Walter E.
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