Measuring and testing – Vehicle drive train – Rear end
Patent
1996-03-25
1998-01-27
Dombroske, George M.
Measuring and testing
Vehicle drive train
Rear end
73 3512, 731181, 73119A, 73714, 73756, 73726, G01M 1500
Patent
active
057124248
ABSTRACT:
A nonintrusive diesel engine cylinder pressure transducer includes a congruously shaped fuel injector stud which has been internally instrumented with full-bridge electrical resistance strain gage circuitry. The instrumented fuel injector stud has a hole 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.
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Dombroske George M.
Kaiser Howard
The United States of America as represented by the Secretary of
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