Reference signal processor circuit

Details Reference signal processor circuit Reference signal processor circuit

1979-06-13

1981-03-10

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Electrical speed signal processing systems

324392, F02P 1700

Patent

active

042557780

ABSTRACT:
To counteract the phase error in the signal from an rpm transducer of an engine test stand or analyzer at varying engine speeds, the signal processor of the invention receives the transducer signal whose amplitude varies with frequency and generates therefrom an output signal of constant amplitude. This signal is supplied to a threshold switch which includes circuitry for integrating periodic output signals and generating therefrom a control signal whose amplitude is proportional to the frequency of the input signal. This analog signal is used to alter the switching threshold of the threshold switch, thereby imparting to the output signal a frequency compensation which counteracts the inherent phase error and results in an output signal of constant phase with respect to the transducer signal. The apparatus of the invention is particularly useful for adjusting ignition timing, valve timing, etc. in internal combustion engines in which the input signal is derived from the crankshaft speed.

REFERENCES:
patent: 4039931 (1977-08-01), Schweizer

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