Fluid-pressure and analogous brake systems – Multiple control – Fluid and electric
Reexamination Certificate
2005-09-16
2008-10-14
Siconolfi, Robert A (Department: 3683)
Fluid-pressure and analogous brake systems
Multiple control
Fluid and electric
C303S007000, C303S020000
Reexamination Certificate
active
07434895
ABSTRACT:
A control system which allows electro-pneumatic control of an equalizing reservoir with the capacity to create penalty applications in a purely pneumatic manner. A controller for the equalizing reservoir includes an electro-pneumatic source of pressure or atmosphere responsive to an electrical equalizing pressure control signal and a pilot valve selectively connecting the electro-pneumatic source or atmosphere to the equalizing reservoir in response to pressure in a pilot port of the first pilot valve. A magnetic valve is provided having a first input connected to a second source of pressure, a second input connected to atmosphere and an output connected to the pilot port of the first pilot valve. At least one penalty valve is connected to the pilot input of the first pilot valve and is responsive to a penalty signal to connect the pilot input to atmosphere. A fourth valve has a first input connected to the second input of the first pilot valve and an output connected to a third source of pressure lower than pressure in the equalizing reservoir prior to a penalty signal. The fourth valve connects its first input to its output in response to a penalty signal. A method of initializing the electro-pneumatic source of pressure or atmosphere responsive to an electrical equalizing pressure control signal.
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Petitt D. Mark
Reynolds John M.
Root Kevin B.
Teifke Richard J.
Barnes & Thornburg LLP
New York Air Brake Corporation
Nguyen Vu Q
Siconolfi Robert A
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