Accession Number:

ADD018909

Title:

Method and Apparatus for Measuring Diesel Engine Cylinder Pressure.

Descriptive Note:

Patent, Filed 25 Mar 96, patented 27 Jan 98,

Corporate Author:

DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s):

Report Date:

1998-01-27

Pagination or Media Count:

13.0

Abstract:

A nonintrusive diesel engine cylinder pressure transducer includes a congruous shaped fuel injector stud which has been internally instrumented with full-bridge electrical resistance strain gage circuitry. The instrumented fuel injector stud has a bole which has been bored axially lengthwise and a full Wheatstone bridge strain gage unit which has been situated in the hole. While the engine is running the operative instrumented fuel injector stud which has been replaced in its normal position in the fuel-injector-cylinder assembly acts in combination with other assembly components as a cylinder pressure transducer. Measurements of tension and compression of the stud are provided which are reflective of pressure mainly due to compression and combustion. in the engine cylinder. The full-bridge configuration eliminates bending effects and affords electrical temperature compensation. Practice of this invention advantageously avails existing structure. The present invention involves no structural impairment and therefore risks none of the concomitant deleterious mechanical effects. thus obviating the conventional need to compromise the structural and functional integrity of the diesel engine in order to measure cylinder pressure.

Subject Categories:

  • Reciprocating and Rotating Engines

Distribution Statement:

APPROVED FOR PUBLIC RELEASE