Patent ID: 6442502
Filing Date: 2002-08-27
Classification: B60T,G01P

Abstract:
Arrangement for sensing the rotational speed of a rotating member, comprising:a sensor element and a controllable current source that delivers a current signal representative of the rotational behavior, a signal-conditioning circuit and a modulator having an output current signal having superposed additional information wherein the sensor element, the controllable current source and a part of the signal-conditioning circuit and the modulator are integrated in a sensor module, and wherein the modulator controls the current source in response to the signals of the sensor element or external signals, wherein the signal-conditioning circuit has at least two signal-conditioning networks which, by way of a control network, in dependence on predetermined criteria, are connected between the sensor element and the modulator and function as signal conditioners wherein the signal path of a first signal-conditioning network includes a DC coupled amplifier with an invariably set amplification, and in that the signal path of a second signal-conditioning network includes a DC coupled amplifier with a variable amplification and with a compensation of the signal direct-current portion on the amplifier input, and this compensation takes place by way of a network with a low-pass filter behavior, and the maximum value of the variable amplification is many times higher than the invariably set amplification of the first signal path.