Speed meter system for vehicle

Details Speed meter system for vehicle Speed meter system for vehicle

1982-06-11

1985-03-19

Krawczewicz, Stanley T.

Electricity: measuring and testing

Electrical speed measuring

Including speed-related frequency generator

324161, G01P 3489

Patent

active

045062161

ABSTRACT:
A speed meter system for a vehicle which comprises a first pulse generator for providing pulses in accordance with the speed or engine speed of a vehicle, a first counter which is coupled to the first pulse generator for counting the number of pulses generated by the pulse generator, a second counter and a comparator coupled to the first and second counters for comparing the counts therein, the comparator producing a first judgement signal indicative of whether the count of the first counter is larger than or smaller than the count of the second counter and a second judgement signal indicative of the equality or inequality of the counts in the first and second counts. A gate circuit is coupled to the comparator for receiving the second judgement signal therefrom, the gate being opened when the second judgement signal indicates an inequality and closed when the second judgement signal indicates equality. A second pulse generator is coupled to the second counter means through the gate circuit for applying pulses to the second counter when the gate circuit is open, thereby changing the count in the second counter and an output is coupled to the second pulse generator through the gate circuit for providing an output indicative of the speed of the vehicle or engine thereof in accordance with the output of the second pulse generator.

REFERENCES:
patent: 4227150 (1980-10-01), Widl
patent: 4430612 (1984-02-01), Onitsuka

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