Digital tachometer

Details Digital tachometer Digital tachometer

1996-11-20

2000-06-06

Hoff, Marc S.

Data processing: measuring, calibrating, or testing

Measurement system

Speed

702141, 702142, 324160, 324164, 324166, 73488, G01P 348, G01R 2302

Patent

active

060730870

ABSTRACT:
A circuit for generating a speed value corresponding to a rotational frequency of a rotating shaft. A digital tachometer circuit has a tachometer circuit and a copy/hold circuit. The tachometer circuit maintains an intermediate speed value which is incremented by a gain constant as the rotational frequency increases and is decremented as the rotational frequency decreases. The copy/hold circuit samples the intermediate speed value at selected intervals, thus generating the speed value. The speed value is displayed to a user and represents the vehicle's speed.

REFERENCES:
patent: 3805089 (1974-04-01), Rau et al.
patent: 3891833 (1975-06-01), Rhoton et al.
patent: 3968434 (1976-07-01), Dixon et al.
patent: 4051434 (1977-09-01), Sweet
patent: 4138723 (1979-02-01), Nehmer et al.
patent: 4286685 (1981-09-01), Rudolph et al.
patent: 4777435 (1988-10-01), Lepley et al.
patent: 5803043 (1998-09-01), Bayron et al.

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