Crank angle signal processing apparatus

Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – With indicator or control of power plant

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701107, 701110, 123612, 123618, G05B 1500, G06F 946

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active

058158278

ABSTRACT:
The present invention relates to a circuit for processing internal combustion engine crank angle sensor signals. The construction is such that an output side circuit of a crank angle sensor outputs a crank angle signal with a high level pulse generated in response to the switching on and off of a switch element connected in series to a power source. Moreover, an input side circuit of a signal processing circuit includes a voltage reducing circuit which pulls down a power source voltage applied at the time of pulse generation, to a predetermined voltage and supplies this to an arithmetic processing section. Consequently, the output signal at the time of no pulse generation becomes a low level so that influence from noise is minimized. Also, since the input signal at the time of momentary disconnection of terminals connecting between the crank angle sensor and the processing circuit is a low level, then erroneous recognition of pulse generation is prevented. Moreover, since at the time of pulse generation, current flows between the terminals, then terminal oxidation film is removed so that poor contact can also be prevented.

REFERENCES:
patent: 3926557 (1975-12-01), Callies et al.
patent: 3941110 (1976-03-01), Sekiguchi
patent: 4442820 (1984-04-01), Ina et al.
patent: 4502446 (1985-03-01), Kanegae et al.
patent: 4558417 (1985-12-01), Akiyama et al.
patent: 4970668 (1990-11-01), Satoh et al.
patent: 5165380 (1992-11-01), Okamura

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