G - Physics – 01 – F
Patent
G - Physics
01
F
G01F 15/00 (2006.01) B60T 13/66 (2006.01) B60T 17/22 (2006.01) G01L 5/28 (2006.01) G01M 17/08 (2006.01)
Patent
CA 2215085
Method and apparatus for providing a filtered signal which indicates of a flow of fluid to a fluid pressure communication conduit, the flow being dependent upon the pressure of fluid in a chamber. The pressure in the chamber is controlled by one or more pressure adjusting valves. The invention provides for receiving into a data processing module one or more valve signals indicating open states of the pressure adjusting valve or valves and also a flowrate signal from a flowrate sensor, which represents the real instantaneous flowrate, and it is this signal which needs to be filtered to remove transients. The invention provides for choosing between a first processing mode and a second processing mode for the flowrate signal. The first processing mode is used when the second processing mode is not in effect and when neither of the valve signals indicates an open valve. The second processing mode is activated when a valve signal indicates an open valve. The second processing mode, when activated, proceeds according to a predetermined procedure and then returns to the first processing mode after no valve signal indicates an open valve. The signal is processed by either the first processing mode or the second processing mode, depending on whether valve signals have been received, and provides the filtered signal as an output to equipment external to the data processing module.
Bailey Gary
Crawford Charles
Dimsa Robert
Ferri Vincent
Macrae & Co.
Westinghouse Air Brake Company
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