Measuring and testing – Instrument proving or calibrating – Fluid pressure
Reexamination Certificate
2005-09-06
2005-09-06
Noland, Thomas P. (Department: 2856)
Measuring and testing
Instrument proving or calibrating
Fluid pressure
C073S001640, C702S116000
Reexamination Certificate
active
06938456
ABSTRACT:
A vacuum generating device and method include a member that defines a passage, a first valve, a second valve, a fluid communication conduit, a transducer, and a processor. The passage extends between a first end and a second end, and includes a constriction that defines an orifice. The first valve connects the first end of the member and an ambient environment, and is electrically positionable in first and second configurations. The first configuration permits generally unrestricted fluid flow between the orifice and the ambient environment, and the second configuration substantially prevents fluid flow between the orifice and the ambient environment. The second valve has a first port and a second port. The first port is adapted for fluid communication with a pressure source at a first pressure level. The second valve is electronically adjustable. The fluid communication conduit connects the second end of the member and the second port of the second valve. The fluid communication conduit includes a fluid communication tap at a second pressure level. The transducer is in fluid communication with the fluid communication tap. The transducer senses the second pressure level and outputs a first electric signal. And the processor is in electrical communication with the second valve and with the transducer. The processor receives the first electric signal from the transducer and outputs a second electric signal to the second electric actuator. The second valve varies fluid flow through the orifice in response to the second electric signal.
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U.S. Appl. No. 10/232,530, filed Sep. 2, 2002, Tetreault, et al., Vacuum Generating Method and Device Including a Charge Valve.
U.S. Appl. No. 10/232,528, filed Sep. 2, 2002, Tetreault, et al., Vacuum Generating Method and Device.
Derikx John
Tetreault Kevin
Noland Thomas P.
Siemens VDO Automotive Inc.
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