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11
openETCS Simulation
Generally, a simulation is applicable to test the behaviour of the generated system to evaluate
the openETCS case study and the developed tool chain as proof of concept for model based
development and tests for openETCS. According to the MDA principle, which is used for the
whole tool chain, also this simulation should be developed based on models.
This chapter starts with an initial description of the simulation methodology, which means
how the simulation environment is set up and can interact with a generated EVC binary.
Afterwards, the PSM (see Section 8.5) for the simulation is introduced, followed by the
simulation model using it.
11.1. Simulation Methodology
The simulation environment should access the generated and compiled binary, which shall be
executed on the train on-board unit, the EVC, through special simulative hardware interfaces 1
in the PSM and DMI. The simulation is modelled by two independent state machines: One
for simulating the ETCS Modes and Application Levels based on a virtual track. The other
for describing the driver’s behaviour by the interaction with the DMI. The data flow between
simulation and on-board binary or rather PSM is sketched in Figure 11.1.
ETCS outputs
speed, telegram
DMI
Simulation
PSM
driver inputs
position, brake system
Figure 11.1.: Simulation environment data flow
1 for odometer, service and emergency brake, and for receiving balise telegrams
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