Simulink® Modeling for Vehicle Simulator Design - Delphi

CAN message logs collected from the vehicle are transmitted
back to the ECU by Simulink ® model in real time to verify
the functionally of vehicle control algorithms. During this
activity, the Simulink ® model monitors software variables in
the ECU via the DAQ feature of CCP. Symbol information
parameters are read from an A2L file by a python script and
passed to the model.
9. TEST AUTOMATION USING
PYTHON SCRIPTS
Verification of functional test procedures can be automated
with the help of python scripts which establish required
values for Simulink ® signals. A set of library modules is
developed with various functions that can be called from
python scripts and can be reused across multiple programs.
Figure 20. Python Scripting Window
10. MESSAGE LOGGER
The Simulink ® model sends raw CAN frames directly to the
host PC through TCP/IP. The message logger decodes and
displays the messages along with their description. This helps
in monitoring CAN traffic for debugging.
Figure 21. Message Logger GUI
SUMMARY/CONCLUSIONS
Using Simulink ® , the time required for vehicle simulator
modeling can be reduced drastically. Simulation logic can be
verified before running on target and can be separated from
low level device drivers, making the model less dependent on
the simulator. In this paper, Simulink ® is used to build a
Vehicle Simulator Model containing basic functionalities for
effectively testing the ECU, which can be configured based
on the tests required to be performed. With this
programmable simulator, ECU is exposed to real world
driving scenarios in a laboratory environment with the test
cases being written through Python automated scripts. Real
world data in terms of vehicle logs can also be replayed back
into ECU and performance of various software algorithms
can be easily verified. The model simulates different kinds of
power waveforms to which the ECU is being exposed and the
performance is analyzed.
REFERENCES
1. MATLAB - Simulink ® Reference & User Guide (http://
www.mathworks.com/)
2. CCP_V2.1.pdf (http://www.asam.net/)
3. ASAM_XCP_Part1-Overview_V1.0.0.pdf (http://
www.asam.net/)
4. Opal-RT TestDrive Manual (http://www.opal-rt.com/
product/testdrive) MATLAB - Simulink ® is a Registered
Trademark of Math Works, Inc. TestDrive is a Registered
Trademark of Opal-RT Technologies.