Rotational speed measurement with frequency-dependent voltage co

Details Rotational speed measurement with frequency-dependent voltage co Rotational speed measurement with frequency-dependent voltage co

1990-09-14

1992-03-31

Wieder, Kenneth A.

Electricity: measuring and testing

Electrical speed measuring

Including speed-related frequency generator

324160, 324173, G01P 3489

Patent

active

051011557

ABSTRACT:
A circuit for determining the speed of rotation of a wheel, has an inductive transmitter (1), the output of which is connected to a pulse-shaping device (7) whose output is connected to an evaluation device. The inductive transmitter is connected to an evaluation circuit (11) by means of a cable (6). The evaluation circuit is intended, on the one hand, to make certain that the input signal of the inductive transmitter (1) can be evaluated while, on the other hand, it should be able to detect errors which may occur, for instance due to a break in the cable (6) despite the presence of dirt resistances (R.sub.S). For this purpose, an auxiliary circuit (10) is provided which varies the internal resistance of the pulse-shaping device (7) as a function of the speed.

REFERENCES:
patent: 4783631 (1988-11-01), Nakashima et al.

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