Apparatus for measuring the speed of an object with circuit for converting analog signals into logic signals and circuit for varying sensitivity
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United States of America Patent
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Feb 20, 1990
Grant Date -
N/A
app pub date -
Feb 17, 1988
filing date -
Mar 20, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The circuit comprises a comparator 1 fed by a quasi-sinusoidal signal delivered by a source 2 for converting the positive alternations of the signal into pulses acceptable by digital computing means. According to the invention, the circuit comprises a current source 7 selectively connectible to the circuit in order to vary its sensitivity and to thus enable an evaluation of the amplitude of the signal delivered by the source 2. Application to the diagnosis of the operating state of a variable reluctance sensor delivering a quasi-sinusoidal signal representing the speed of rotation of a shaft fitted in a motor vehicle.
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