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5. Direct electro-pneumatic brake
When the first automatic control systems for metros appeared in the 1960s, the problem arose of the response times of compressed-air pneumatic braking: these response times soon proved incompatible with automatic control, mainly because of the time required to transmit braking and brake-release commands along the train, rather than the local response times for variations in force at the level of each vehicle or bogie in the train.
The answer soon came in the form of the use of power lines, as was already the case for traction control.
This gave rise to what is properly termed the electro-pneumatic brake, i.e. a brake whose train control uses electric train lines and whose local execution (force generation) uses pneumatic technology.
We'll see later that this term covers a wide spectrum of technologies, some of the...
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Direct electro-pneumatic brake
Electrohydraulic brake
Bibliography
Standards and norms
- Railway applications – Braking – Generic vocabulary - EN14478 -
- Railway applications – Braking – Braking requirements for locomotive hauled trains - EN14198 -
- Railway applications – Braking systems for high-speed trains – Part 1: Requirements and definitions - EN15734-1 -
- Railway applications – Brake systems for motorized trains – Part 1: Requirements and definitions - EN16185 -
- Railway...
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