Magnetic difference position sensor to measure rotation position and speed of crankshaft in vehicle, has signal conditioning circuit connected to both galvanomagnetic elements for selectively outputting signal

摘要

Signal conditioning circuit (36) is coupled to individual difference sensor (14) with galvanomagnetic elements (MR1,MR2). The conditioning circuit responds to different voltage outputs from the elements and outputs a voltage (VAUS) to indicate relative angle position of pulse generator wheel. Adapters are provided in the circuit for continuous adaptation of voltages. An individual difference sensor (14) is arranged opposing and with a specified separation from a pulse generator wheel (10) with tooth flanks (12), so that the wheel rotates with respect to the sensor. The sensor has a pair of galvanomagnetic elements (MR1,MR2) fed with constant currents from current sources (30,32) and premagnetized by a permanent magnet (16). The outputs of the elements are fed to a signal conditioning circuit (36) to receive the output voltages (VMR1,VMR2), responding to the successive tooth flanks of the wheel. The circuit has a pair of adapters for responding to outputs for tooth flanks and slits and selects the outputs to deliver voltage output (VAUS) determining the angle of rotation. An Independent claim is also included for method of detection of rotation.