Measuring and testing – Gas content of a liquid or a solid – By pressure of the gas
Patent
1994-03-03
1995-06-27
Chilcot, Jr., Richard E.
Measuring and testing
Gas content of a liquid or a solid
By pressure of the gas
73 1903, 123516, 123518, G01N 714
Patent
active
054269717
ABSTRACT:
An on-board diagnostic system is provided for determining the presence of vapor in a fuel supply line of an internal combustion engine during engine operation. Sensing means are operatively mounted to the fuel supply line for sensing transient fuel pressure waves resulting from actuation of one or more fuel injectors. The sensing means generates a pressure signal corresponding to the transient fuel pressure waves at least over a selected test interval. Signal processing means receives the pressure signal and determines its resonance frequency over at least a selected frequency range. The test interval resonance frequency is compared to a stored resonance frequency corresponding to an acceptable vapor level in the fuel supply line. The signal processing means generates an output signal upon detecting a value difference greater than a preselected amount (e.g., greater than zero) between the test interval resonance frequency and the stored resonance frequency. Utilization means are provided for response to the output signal, for example, by illumination of an indicator light visible to the operator of a motor vehicle in which the engine is equipped with the on-board diagnostic system of the invention.
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Chui Granger K.-C.
Glidewell John M.
Yang Woong-Chul
Abolins Peter
Chilcot Jr. Richard E.
Ford Motor Company
May Roger L.
McCall Eric S.
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