An Algorithm For Braking Curve Calculations
In ERTMS Train Protection Systems
Author(s)
B. Friman
Abstract
The European Railroad Transportation Management Systems standard for train
protection, ETCS, includes several advanced features for predicting the safe
speed from a number of target locations ahead of the train. The braking system
can have a different braking capability in different speed segments. The area in
front of the train can contain a number of targets with different target and release
speeds. The area in front of it is also segmented according to the gradients, in a
way which is independent of the targets. The variables that shall be input to the
braking curve algorithm therefore have three dimensions. Since permitted speed
shall be calculated, rather than time to intervention, square roots are needed for
the calculations, which require some computational power. The article suggests
an algorithm where the gradients and the targets are combined in one table. This
makes the input variable area two-dimensional instead of three-dimensional,
which simplifies calculations and reduces the necessary number of square root
calculations.
Keywords: ETCS, ERTMS, braking curve, ATP.
1 Introduction
The European Train Control System – the new European standard for automatic
train protection, uses basically a three-dimensional set of data as input to the
supervision algorithms. The three dimensions are: a table of speed restrictions, a
table of gradient sections, and a table of deceleration abilities in relation to
speed. The output from the algorithms is expressed in the form of speed values;
e.g. which is the highest possible speed the train can run, in order to be able to
Keywords
ETCS, ERTMS, braking curve, ATP.
Related Book
Other papers in this volume
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