System for detecting neutral state of a transmission of an engin

Details System for detecting neutral state of a transmission of an engin System for detecting neutral state of a transmission of an engin

1981-12-23

1985-05-21

Miller, Stanley D.

Electrical pulse counters, pulse dividers, or shift registers: c

Applications

Determining machine or apparatus operating time or...

123339, G07C 100

Patent

active

045190895

ABSTRACT:
A system for detecting a neutral state of a transmission for an engine mounted on a vehicle comprises an engine speed detecting device for producing an engine speed output signal in proportion to the engine speed; and a vehicle speed detecting device for producing a vehicle speed output signal in proportion to the vehicle speed. An operation circuit is provided for judging whether the ratio of the engine speed output to the vehicle speed output is in a transmission ratio range dependent on the transmission. The operation circuit is so arranged as to produce at least one neutral state output when the ratio of the engine speed output to the vehicle speed output is not in the transmission ratio range. The operation circuit comprises counters for counting the output pulses, circuits for producing signals for deciding the period of operation of the counters, and circuits including a gate circuit for producing the neutral state output in dependency on the result of the counting during the period of the counter operation.

REFERENCES:
patent: 4294341 (1981-10-01), Swart
patent: 4320381 (1982-03-01), Olivier
patent: 4371050 (1983-02-01), Ikeura
patent: 4408293 (1983-10-01), Avins
patent: 4446832 (1984-05-01), Matsumura et al.

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