Speed control apparatus and method for railroad car retarders

Details Speed control apparatus and method for railroad car retarders Speed control apparatus and method for railroad car retarders

B - Operations, Transporting

61

K

343/12, 341/87

B61K 7/12 (2006.01) G01S 13/00 (2006.01)

Patent

CA 1133096

(Case No. 6979) ABSTRACT OF THE DISCLOSURE An acceleration servo control system for railroad car retarders in which a computed desired instantaneou decelera- tion signal and a measured actual deceleration signal are compared and any resulting error signal is fed back through the servo network to adjust retarder braking pressures to achieve and/or hold the desired deceleration rate which will allow the cut of cars to leave the retarder at a selected speed. The desired instantaneous deceleration is computed using an algorithm incorporating actual measured speed, the selected exit speed, the number of axles in the retarder, and the remaining distance-to-go for all axles of the cut over which retarder braking will be effective, and based on the principle of braking each axle-wheel unit throughout the entire retarder length.

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