Circuit for the recognition of knocking of an Otto engine

Details Circuit for the recognition of knocking of an Otto engine Circuit for the recognition of knocking of an Otto engine

1984-07-24

1986-09-02

Levy, Stewart J.

Measuring and testing

Engine detonation

Combustion signal compared to reference signal varied by a...

G01L 2322

Patent

active

046088555

ABSTRACT:
A circuit for the recognition of knocking of an Otto engine includes a spark plug in the combustion chamber of a cylinder which also serves as an ionic current probe. Both an excitation voltage generator and, an evaluation circuit for the measuring voltage are coupled to the high-voltage ignition circuit. The excitation voltage generator is provided by a high-frequency oscillator. The input coupling of the excitation voltage is effected non-galvanically. The evaluating circuit comprises an amplitude demodulator for the high-frequency oscillations. The benefits of the present invention resulting from a knock recognition circuit of such a configuration that critical electrical components and galvanic coupling are avoided.

REFERENCES:
patent: 3286164 (1966-09-01), de Huff
patent: 4233943 (1980-11-01), Rogora et al.
patent: 4491110 (1985-01-01), Bone et al.

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