1
David A Greer, David E Schweikert: Event history data acquisition. Westinghouse Air Brake Company, James Ray & Associates, August 4, 1998: US05790427 (32 worldwide citation)

An event data recorder and method for recording data relating to a distinct event which pertains to operation of a mechanism. The recorder comprises a device for collecting data pertaining to such operation and formatting such data into a sequence of data elements. A circular buffer is linked to the ...


2
James T Dewberry, David E Schweikert, Robert N Scharpf: Software based brake shoe wear determination. Westinghouse Air Brake Technologies Corporation, Webb Ziesenheim Logsdon Orkin & Hanson P C, January 25, 2005: US06847869 (25 worldwide citation)

By calculating energy used by friction brake equipment, the amount of friction brake shoe/pad wear is monitored. As amount of energy supplied reaches a percentage of the friction brake shoe/pad energy design limit, and indication for inspection is provided. If the supplied friction energy continues ...


3
Robert N Scharpf, David E Schweikert, James T Dewberry: Brake effort monitor. Westinghouse Air Brake Technologies Corporation, James Ray & Associates, May 25, 2004: US06739675 (13 worldwide citation)

A brake effort monitor for railcar braking systems includes means connected to receive a brake effort request signal and a vehicle speed signal for generating an energy requested signal. Another device is connected to receive a brake effort actual signal and a vehicle speed signal for generating an ...


4
David E Schweikert, Robert N Scharpf, James A Wood: Pneumatic emergency brake release timer. Wabtec Holding Corporation, The Webb Law Firm, April 21, 2009: US07520574 (5 worldwide citation)

A pneumatic emergency brake release timer comprises a high capacity transfer valve, a timing reservoir in communication with the pilot port of the high capacity transfer valve, the check valve and choke circuit providing parallel connections between the main source of pressure and the reservoir thro ...


5
James A Wood, David E Schweikert, David A Greer: Relative spin speed traction control. Westinghouse Air Brake Company, James Ray & Associates, April 14, 1998: US05740043 (4 worldwide citation)

An apparatus for providing relative spin speed traction control on a railway vehicle. Such apparatus includes a wheel spin detection device connected to receive a plurality of input signals; one of such input signals being an externally generated axle rate signal which represents an acceleration/dec ...


6
David E Schweikert, James A Wood: Universal wheel slip force control logic. Westinghouse Air Brake Company, James Ray & Associates, November 2, 1999: US05975656 (3 worldwide citation)

A method in part enables a wheel slip control system that controls slip on a per axle basis to control slip on a per truck basis. The wheel slip control system issues on a per axle basis an axle reduction signal indicative of a percentage by which to reduce the braking force that would normally be a ...


7
David E Schweikert, Robert N Scharpf, James A Wood: Wheel slip brake assurance module. Wabtec Holding Corporation, The Webb Law Firm, May 20, 2008: US07374252 (1 worldwide citation)

A wheel slip assurance module comprises a device for disabling the wheel slip valve, a timing reservoir in communication with the disabling device, and a check valve and choke circuit providing parallel connections between the output of the wheel slip valve and the timing reservoir having a first co ...


8
James A Wood, Robert N Scharpf, David E Schweikert: Pneumatic emergency brake assurance module. Wabtec Holding, The Webb Law Firm P C, February 16, 2010: US07661770 (1 worldwide citation)

A pneumatic emergency brake assurance module comprises a high capacity transfer valve connected in a first position to the output of the variable load relay valve and in a second position connected to a source of emergency braking air pressure. A timing reservoir is in communication with the pilot p ...


9
James A Wood, David E Schweikert: Wheel slip control parameter variation process. Westinghouse Air Brake Company, James Ray & Associates, October 5, 1999: US05961564 (1 worldwide citation)

A wheel slip control system employs a method of varying the detection and correction parameters it uses based on whether the wheel/axle combinations on a truck of a rail vehicle operate in the coupled or decoupled modes of operation. The control system executes programming code featuring detection a ...


10
David E Schweikert, James A Wood: Smart resolution valve pressure control. Westinghouse Air Brake Technologies Corporation, The Webb Law Firm, November 7, 2006: US07133796

The Smart Resolution Valve Pressure Control System allows any pressure control system using valve state pulsing to modify airflow at an optimum and consistent range of operation thereby enhancing control accuracy and increasing the useable cycle life of any valve combination used.