Tire's physical parameter e.g. wear out, monitoring device for motor vehicle, has detection units determining electrical characteristics of circuit from damped signal produced by passive sub-assembly based on sequence of excitation signal

摘要

The device has magnetic excitation units (21) transmitting a magnetic excitation signal formed of successive sequences having pulses e.g. bipolar positive pulses, during functioning, to a reduced reciprocal influence zone of passive and active sub-assemblies (1, 2), where the pulses are produced with an iron excitation frequency. Detection units (22) determine electrical characteristics e.g. capacitance, of an electrical resonant circuit from an oscillatory damped sinusoidal signal that is selectively produced by the sub-assembly (1) based on each sequence of the excitation signal.