Release assuring arrangement for combined...

B - Operations – Transporting – 60 – T

Patent

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Details

IPC codes

B60T 13/58 (2006.01) B60T 13/66 (2006.01)

Type

Patent

Patent number

CA 2204323

Description

An electro-pneumatic brake control system for a railroad freight car comprises application and release solenoid valves controlled by a microprocessor overlayed with the conventional car automatic pneumatic brake control system, including means for bleeding off auxiliary reservoir pressure at least during a power failure mode of operation during which the pneumatic brakes become effective to apply the car brakes in response to an induced brake pipe pressure reduction in the course of indirectly supplying brake pressure on cars having operable electro-pneumatic brakes. The bleed of auxiliary reservoir air pressure allows a subsequent slow recharge of the brake pipe pressure to create a positive release pressure differential across the control valve service piston to assure a brake release of the automatic pneumatic brake application to obviate a "stuck brake~ condition on a car experiencing an electro-pneumatic power failure.

L'objet de la présente invention est une commande de frein électropneumatique pour wagon à marchandises, laquelle comporte des vannes électromagnétiques commandées par un microprocesseur auquel est superposé un système de commande de freinage pneumatique incorporant un dispositif permettant de purger le réservoir de pression auxiliaire au moins en cas de défaillance, mode durant lequel les freins pneumatiques entrent en fonction en réponse à une réduction de pression induite dans la conduite principale lorsqu'une pression de freinage est indirectement transmise vers les wagons équipés de freins électropneumatiques. La purge du réservoir de pression auxiliaire donne lieu au lent rétablissement de la pression à l'intérieur de la conduite principale pour créer un différentiel de pression positive au niveau du piston de la vanne de commande, pour ainsi assurer le desserrage du frein pneumatique et éviter une situation de frein "collé"dans les wagons en cas de défaillance du système électropneumatique.

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