Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Reexamination Certificate
2008-03-18
2008-03-18
Rodriguez, Pam (Department: 3683)
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
C702S058000, C361S042000, C361S063000, C324S509000, C324S522000
Reexamination Certificate
active
11126801
ABSTRACT:
A method and system is provided for detecting and performing diagnostics regarding an incipient ground fault that may occur in an electrical propulsion system of a traction vehicle, such as a locomotive, transit vehicle, or off-highway vehicle. The method allows providing a first ground connection for the electrical propulsion system. This first ground connection forms a grounding path generally used by the electrical propulsion system during normal operation. The method further allows providing a second ground connection for the electrical propulsion system. This second ground connection forms a grounding path selectively usable in lieu of the first ground connection. A control strategy is defined for switching between the first ground connection and the second ground connection. A respective leakage current associated with at least one of the first and second ground connections may be monitored. Switching between the first and second ground connections may be controlled based on the monitored leakage current associated with at least one of the first and second ground connections.
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Kumar Ajith Kuttannair
Linebach Mark Alan
McGarry Jeremy T.
Worden Bret Dwayne
Zarella Scott Joseph
Beusse Wolter Sanks Mora & Maire, P.A.
Hanze Carlos
Mora Enrique J.
Rodriguez Pam
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