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Freight brake control for uniform car deceleration

  • US 5,820,226 A
  • Filed: 04/25/1996
  • Issued: 10/13/1998
  • Est. Priority Date: 02/06/1996
  • Status: Expired due to Term
First Claim
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1. A railway freight brake apparatus for use on-board a rail vehicle in a train, such vehicle having a friction brake actuated by a pneumatic brake cylinder and having a reservoir as a storage source of pressurized fluid, such apparatus comprising:

  • (a) receiving means for receiving a brake signal indicative of a desired braking level of such train;

    (b) at least one valve to control the pressurization of such brake cylinder from such reservoir and the depressurization of such brake cylinder;

    (c) processor to derive a calculated brake cylinder pressure from said brake signal to produce a generally uniform net shoe force for operation of such rail vehicle above a predetermined transition weight and a generally constant net braking ratio of such vehicle below said transition weight;

    (d) said processor to control said valve to operate such brake cylinder at said calculated brake cylinder pressure over a range of braking of such vehicle, and wherein said transition weight generally equals the train net braking ratio times the weight of the rail vehicle divided by 0.20.

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