Operational testing device for inlet valves and outlet valves of reciprocating engines

• US 4,370,884 A
• Filed: 12/10/1980
• Issued: 02/01/1983
• Est. Priority Date: 12/19/1979
• Status: Expired due to Term

• Current Assignee: Hans List
• Original Assignee: Hans List
• Inventors: Woss, Gerhard, Schreiber, Erich
• Primary Examiner(s): Kazenske, Edward R.
• Assistant Examiner(s): Carlson, David V.
• Application Number:
  US06/215,069
• Time in Patent Office: 783 Days
• Field of Search: 73/116, 73/117.3, 73/118, 73/119 R, 73/40.5 A, 73/592
• US Class Current: 73/114.79
• CPC Class Codes: F01L 1/46 Component parts, details, or accessories, not provided for in preceding subgroups
• CPC Class Codes: F02B 77/082 relating to valves
• CPC Class Codes: G01H 3/00 Measuring characteristics of vibrations by using a detector in a fluid G01H7/00, G01H9/00, G01H11/00 take precedence
• CPC Class Codes: G01M 13/00 Testing of machine parts

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.

Claims

1. An operational testing device for inlet valves and outlet valves of reciprocating engines which are separately driven for an operational test, comprising at least one microphone disposed in the inlet pipe and at least one microphone disposed in the outlet pipe of the engine, combined amplifier and electronic filters to which said microphones are respectively connected, a gate circuit to which signals are forwarded from said combined amplifier and electronic filters, means supplying said gate circuit with crank angle signals from the engine, limit value switches connected to said gate circuit for the reception of the signals therefrom in a predetermined crank angle area, and an interpretive circuit connected to said switches for activation thereby when a certain, predetermined level is exceeded by the signals forwarded from said gate circuit, said means also supplying said interpretive circuit with crank angle signals from the engine, whereby said interpretive circuit allocates a signal received from said switches to one of said valves causing said received signal.

2. The device according to claim 1, wherein said inlet and outlet pipes include branch pipes for said valves, microphones being disposed in the branch pipes of each of said valves to be tested.

3. The device according to claim 1 or 2, wherein an adaptor is provided for each of said microphones and is attached to said pipes.