Electricity: measuring and testing – Electrical speed measuring – Including speed-related frequency generator
Patent
1979-04-17
1982-05-11
Strecker, Gerard R.
Electricity: measuring and testing
Electrical speed measuring
Including speed-related frequency generator
324207, G01P 348, G01P 354, G01B 714
Patent
active
043296459
ABSTRACT:
A rotational speed measuring system comprises a rotatable member with calibration segments and a marker portion both provided along the periphery of the rotatable member, pick-ups for producing a pulse train signal in response to passage of the calibration segments and the marker portion when the rotatable member rotates, an electrical circuit for producing calibration pulses and marker pulses in response to the output signals of the pick-ups, a monostable multivibrator responsive to the marker pulse to produce a pulse signal of a predetermined pulse width, and a counter responsive to the calibration pulses for a period of time defined by the pulse width of the pulse signal from the monostable multivibrator. The counter counts the number of the calibration pulses corresponding to calibration segments which are equidistantly spaced from each other, thereby producing an output signal indicative of the rotational speed of the rotatable member with high accuracy.
REFERENCES:
patent: 3525044 (1970-08-01), Richmond
patent: 3930201 (1975-12-01), Ackermann et al.
patent: 3955178 (1976-05-01), Warfel
patent: 3963987 (1976-06-01), Rivere
patent: 4024458 (1977-05-01), Templin
patent: 4053826 (1977-11-01), Wasawa et al.
patent: 4072893 (1978-02-01), Huwyler
Nissan Motor Company Limited
Snow Walter E.
Strecker Gerard R.
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