Method for detecting the failure of a frequency sensor, and circuit for implementing said method
AssigneeSagem Defense Securite
InventorsNicolas Geneste, Gwénaël Esteve
Life of this patent
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Abstract
A method of detecting a fault of a frequency sensor having a bias resistor and associated with a rotary member. The following steps are performed while the rotary member is stationary: injecting into the bias resistor of the sensor inverted alternating signals (S1, S2) comprising at least one first alternation (A1) and at least one second alternation (A2), the first alternation being of amplitude greater than the amplitude of the second alternation; and detecting a frequency of an output signal (S″) from the sensor. A measurement circuit implementing the method is also provided.
Claims5
A method of detecting a fault of a frequency sensor that is associated with a rotary member, the method comprising performing the following steps while the rotary member is stationary:
- injecting pulses into two terminals of the sensor in the form of inverted alternating signals (S1, S2) each comprising at least one first alternation (A1) and at least one second alternation (A2), the first alternation being of amplitude greater than the amplitude of the second alternation;
- and
- detecting at least one pulse in an output signal (S″) from the sensor, detection relating to a frequency of the output signal (S″) from the sensor.
Dependencies are inferred from the claim text.