CPC B60T 8/94 (2013.01) [B60T 8/1705 (2013.01); B60T 8/1893 (2013.01); B60T 8/3235 (2013.01); B60T 13/665 (2013.01); B60T 13/683 (2013.01); B60T 15/021 (2013.01); B60T 15/027 (2013.01); B60T 15/20 (2013.01); B60T 17/221 (2013.01); B60T 2270/402 (2013.01); B60T 2270/413 (2013.01); B60T 2270/88 (2013.01)] | 14 Claims |
1. An electropneumatic brake system for a rail vehicle configured to provide emergency braking, the electropneumatic brake system comprising:
brake cylinders for applying a brake force;
emergency regulator valve that has an emergency back-up chamber; and
an emergency magnet valve,
wherein the emergency regulator valve is adapted to provide an output pressure nominally equal to a variable load pressure and at a tare back-up setting when the variable load pressure is lower than the tare back-up setting, and is coupled to a main relay regulator via direct connection between the main relay regulator and the emergency magnet valve,
wherein the emergency magnet valve is controlled by a first electronic control unit that regulates brake cylinder pressure,
wherein the emergency magnet valve is closed when energised,
wherein, when the emergency magnet valve is de-energised, pressure is allowed into the emergency back-up chamber,
wherein regulation of a brake cylinder pressure by the first electronic control unit continues during an emergency application such that the brake cylinder pressure applied during an emergency stop does not drop below a predetermined level, and
wherein, in the event of power-loss during an emergency brake stop, a nominal emergency brake pressure is applied to the brake cylinders.
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