G - Physics – 05 – D
Patent
G - Physics
05
D
341/86
G05D 13/62 (2006.01) B60K 31/04 (2006.01) B60T 7/12 (2006.01) G01P 3/48 (2006.01)
Patent
CA 1156330
ABSTRACT OF THE DISCLOSURE A tachometer signal provides input to first and second parallel connected channels, each of the channels comprising in series operational amplifier, threshold detector, and counting devices. A comparator checks that the same count is registered by the counters of both channels. Each of the threshold detectors is biased to require a minimum amplitude over and under tachometer pulse input in order to deliver an output to the pulse counter of the associated channel. Attenuating circuits act on the inputs of the operational amplifiers of both channels during predetermined intervals to check that the amplitude of the tachometer pulses is sufficient to be counted by the tachometer counters. Dynamic checking circuits are provided to check the integrity of the attenutating system.
366649
Rutherford David B.
Sibley Henry C.
Borden Ladner Gervais Llp
General Signal Corporation
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