Sensor arrangement, e.g. for motor vehicle crankshaft sensing enables relatively reliable information to be produced during calibration phase - sets imaginary null crossings of sensor signal following detected extremes, generates second alternating output signal according to imaginary null crossings

摘要

The sensor arrangement generates an analogue output signal with successive maxima and minima. A first output signal generator (4-9,11,23) produces a first alternating output signal (5) according to the sensor signal null (200) crossings. A process controller (25) determines a first phase in which the first signal is output and a calibration phase in which a second alternating signal (5') is output. An extreme value detector (16,17) performs phase-shifted detection of the successive maxima and minima. A null crossing setting device sets imaginary null crossings of the sensor signal following the detected extremes. A second alternating output signal is generated according to the imaginary null crossings.