The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 01, 1983
Filed:
Dec. 10, 1980
Gerhard Woss, Graz, AT;
Erich Schreiber, Graz, AT;
Other;
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.