Measuring and testing – Simulating operating condition – Marine
Patent
1977-03-25
1978-06-13
Myracle, Jerry W.
Measuring and testing
Simulating operating condition
Marine
G01M 1500
Patent
active
040941914
ABSTRACT:
A single pressure transducer tapped into the fuel system of an engine, at a point to be responsive to the pressure of the fuel operating against the pressure regulating bypass valve of the fuel system, is used to measure fuel pressure at low idle speed and at high idle speed of the engine; the two pressures when compared against normal pressure can determine bypass valve condition since lower than normal pressure at low idle speed in combination with normal pressure at high idle speed is an indication of a bypass valve which is stuck in the open position, and higher than normal pressure at high idle speed is indication of a bypass valve which is stuck in the closed position. The test can also discern other faults since a lower than normal pressure at high idle speed in combination with a lower than normal pressure at low idle speed is indicative of a bad pump. And, a normal pressure at low idle speed and a lower than normal pressure at high idle speed together are indicative of a filter or other restriction in the line. An exemplary process for making the fuel pressure measurements at two different speeds and a simple illustration of diagnostic analysis of the results thereof are disclosed. Since excessive high idle pressure resulting from the bypass valve being stuck in the closed position will exceed any normal pressure reduction from line restrictions (usually due to dirty filters), even combined faults can be isolated, one at a time.
REFERENCES:
patent: 3808882 (1974-05-01), Nick et al.
War Dept. Technical Manual TM1-408 Aircraft Power Plant Operation, Mar. 1944. pp. 9, 10
Goetsch Henry E.
Mercik, Jr. Henry J.
Myracle Jerry W.
United Technologies Corporation
Williams M. P.
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