Apparatus for detecting oscillations occurring during engine kno

Details Apparatus for detecting oscillations occurring during engine kno Apparatus for detecting oscillations occurring during engine kno

1979-07-05

1981-03-17

Myracle, Jerry W.

Measuring and testing

Engine detonation

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

310327, G01L 2322

Patent

active

042559650

ABSTRACT:
In order to suppress the train of detector oscillations after the disappearance of the engine knock phenomenon, the invention provides a piezoelectric oscillator which is set into vibration by engine knock and includes circuitry for applying signals of opposite polarity to the oscillator at times when no engine knock is expected. Accordingly, the output of the piezoelectric engine knock detector is used only in a relatively narrow time interval during the combustion cycle. In the remaining interval, the circuit switches over to a configuration where the oscillations of the piezoelectric oscillator are damped. The construction of the invention makes it possible to discriminate between different cylinders of a multi-cylinder engine and to assign the knock phenomenon to particular engine cylinders. A number of embodiments is presented.

REFERENCES:
patent: 3532911 (1970-10-01), Roberts et al.

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