Tachometer

Details Tachometer Tachometer

1975-06-12

1977-02-01

Rolinec, R. V.

Electricity: measuring and testing

Electrical speed measuring

Including speed-related frequency generator

324161, 307225R, 328 20, 328 38, G01P 360, G01P 348

Patent

active

040064174

ABSTRACT:
A tachometer for measuring and comparing the angular velocity of a first and a second wheel of a vehicle includes means for sensing and generating a train of pulses for each of the wheels wherein the repetition rates of the pulse train varies in proportion to the angular velocity of the wheel. For each of the wheels a frequency doubler is provided for doubling the repetition rate of the pulse train of the varying repetition rates having pulses of the same pulse width and amplitude. For each wheel the frequency doubled pulse train is then integrated to provide a DC output. The two DC outputs for the two wheels are then compared, selected and applied to corresponding output terminals of the tachometer.
The frequency doubler includes a capacitive means and means for charging and discharging the capacitive means to a first and a second potential in response to the rise and fall of each of the incoming pulse train to provide the output pulse train having twice the repetition rate as the incoming pulse train and having pulses of the same duration and amplitude.

REFERENCES:
patent: 3548317 (1970-12-01), Bordonado
patent: 3566159 (1971-02-01), Plunkett
patent: 3569732 (1971-03-01), Christensen
patent: 3585411 (1971-06-01), Cecchin et al.
patent: 3593156 (1971-07-01), Jordan
patent: 3611109 (1971-10-01), Jones
patent: 3770327 (1973-11-01), Ruof
patent: 3809956 (1974-05-01), Burkel et al.
patent: 3838344 (1974-09-01), Tanimoto

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