Operational testing device for inlet valves and outlet valves of

Details Operational testing device for inlet valves and outlet valves of Operational testing device for inlet valves and outlet valves of

1980-12-10

1983-02-01

Kazenske, Edward R.

Measuring and testing

Vehicle chassis

Steering

73116, 73119R, G01L 326, G01L 513, G01M 1500

Patent

active

043708846

ABSTRACT:
An operational testing device for inlet valves and outlet valves of reciprocating engines which are separately driven for an operational test comprises at least one microphone arranged in the inlet pipe and at least one microphone arranged in the outlet pipe of the engine, a combined amplifier and electronic filter, and a gate circuit to which the signals of the microphones are supplied after passing the amplifier and electronic filter. To enable a clear identification of the microphone signals of a defective valve as compared to signals generated by valve noise and extraneous noise, a gate circuit is controlled according to the crank angle of the engine, at least one limit value switch is provided to which the signal is forwarded via the gate circuit in a predetermined crank angle area, and an interpretive circuit is controlled according to the crank angle, actuated by the output signal of the limit value switch and allocating the output signal to the particular valve causing the signal.

REFERENCES:
patent: 3399563 (1968-09-01), Helms
patent: 3500676 (1970-03-01), Palmer
patent: 3673857 (1972-07-01), Teitelbaum
patent: 3777559 (1973-12-01), Rennick et al.
patent: 4133205 (1979-01-01), Hulls et al.
patent: 4252013 (1981-02-01), Hyanova et al.

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