Patent ID: 8803511
Filing Date: 2014-08-12
Classification: F16H

Abstract:
1. A motor vehicle gearbox position sensor, comprising: a probe for interacting with a mobile target connected to an element for actuating the ratios of a gearbox to supply at least one analog signal representative of a neutral position of the gearbox; and a signal processing unit comprising an analog-digital pulse-width modulation (PWM) converter for converting the analog signal into a digital output signal whose pulse width corresponds to the neutral position, to provide a predefined periodic item of information corresponding to the neutral position only, when the target is in the neutral position and when the sensor is in a normal operating state, wherein the signal processing unit is further configured to compare an amplitude of the digital output signal with a predefined threshold to diagnose the digital output signal in order to reveal a presence of an inappropriate contact resistance or a resistance that is present on a cable of an electric circuit of the sensor, the sensor transmitting a diagnostic signal corresponding to an operating state of the sensor based on said comparison.