John L Drake

US Patent:

52441717, Sep 14, 1993

Filed:

Nov 20, 1991

Appl. No.:

7/795358

Inventors:

John W. Drake - Cincinnati OH
James A. Wood - Spartanburg SC

Assignee:

Westinghouse Air Brake Company - Wilmerding PA

International Classification:

B61C 1508
B60T 800

US Classification:

2461681

Abstract:

An interslip sequence slip control system for multiple wheel axle units for railway vehicles including an electronic logic network for determining whether all the axles of the vehicle are slipping at the same time. A first circuit for selecting the maximum axle speed on the vehicle and a second circuit for selecting the minimum axle rate on the vehicle. A converter circuit for increasing the bit size of the maximum axle speed signal. A plurality of calculating circuits for producing a speed reference signal. An interslip sequence circuit for supplying the maximum axle speed signal to a reconversion circuit when at least one axle is not undergoing slippage and for supplying the speed reference signal to the reconversion circuit when all the axles on the vehicle are slipping.

US Patent:

52807185, Jan 25, 1994

Filed:

Aug 3, 1992

Appl. No.:

7/923678

Inventors:

John W. Drake - Cincinnati OH
David J. Pcsolar - Greer SC
James A. Wood - Spartanburg SC

Assignee:

Westinghouse Air Brake Company - Wilmerding PA

International Classification:

G01L 528

US Classification:

73129

Abstract:

A transducer health and offset calibration processing arrangement for a multiple axle railway vehicle including a brake cylinder transducer correction function circuit coupled to a stuck/dragging brake signal terminal, a brake command signal terminal, and a power/brake trainline signal terminal. A zero speed latch circuit and a transducer circuit interface health check circuit connected to a zero speed signal terminal. A first three-input AND gate connected to the zero speed signal terminal, a snowbrake trainline signal terminal, and a Servotrol output signal terminal. A second three-input AND gate coupled to the output of the first three-input AND gate and a highest axle speed signal terminal. A minimum axle rate discriminator circuit connected to each of plurality of axle rate signal terminals of the multiple axles of the railway vehicle. A brake cylinder pressure circuit check and a brake cylinder pressure signal generator coupled to a truck brake cylinder pressure signal terminal.

US Patent:

53155203, May 24, 1994

Filed:

Sep 6, 1991

Appl. No.:

7/756021

Inventors:

John B. Drake - Cincinnati OH
James A. Wood - Spartanburg SC
Carl J. Slavick - Greenville SC
Richard J. Mazur - Greer SC

Assignee:

Westinghouse Air Brake Company - Wilmerding PA

International Classification:

B60L 300

US Classification:

36442605

Abstract:

A friction brake interface health check system for dynamically diagnosing and monitoring the operational status of a plurality of input signals by using a pattern fault recognition and an intelligent diagnostic matrix which is generated by brake level demand, power/brake trainline, electric brake feedback and electric brake rate request modules to control an interface health determination fault monitor module which determines which errors are to be reported to the event interface file, the RAM fault log and which are displayed on a seven (7) segment display.