Circuit for producing pulses indicative of speed from a rotary g

Details Circuit for producing pulses indicative of speed from a rotary g Circuit for producing pulses indicative of speed from a rotary g

1983-06-15

1984-12-11

Myracle, Jerry W.

Measuring and testing

Test stand

For engine

123414, G01M 1500

Patent

active

044870590

ABSTRACT:
The Schmitt trigger threshold switch which produces rectangular waves in response to the output of a rotary ignition timing generator has a variable bias applied to its switch-in threshold which is proportional to the amplitude of the generator output, while the switch-out threshold remains fixed at or near zero voltage. The bias, which may be developed by a peak detector, prevents inherent ignition timing shift as the generator turns faster. The Schmitt trigger utilizes an inverting comparator so that a "lowest-wins" circuit can be used for applying stabilizing negative feedback or bias to the comparator. The bias provides immunity to disturbing voltages which increase with signal amplitude.

REFERENCES:
patent: 3328681 (1967-06-01), Wood

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