Diesel Engine Control System Co-Simulation Tool Applied to Real Driving Emission Validation

Autoren

Julien Schmitt, Julien Ardeois, Damien Didiot, Jean Balland,
Delphi Automotive Systems Luxembourg S.A., Bascharage

Zusammenfassung

Complex embedded software such as that associated with engine management systems require coherent inputs from the engine and for the vehicle to be tested consistently. Hardware in the loop is a common technique used in the automotive industry to test the engine control unit (ECU) software.

An alternative tool has been developed at Delphi, called "SEC-in-the-loop". It combines the Delphi Structured Engine Control (SEC) software, which contains around 200 sub-functions, with an engine and a vehicle model in order to simulate on a computer the whole system, from driver to vehicle, including the ECU software.
Scripts are used to connect the C-code of the SEC functions as implemented in the ECU. This code is then compiled to be executed on a computer. The engine and vehicle models for a 1.6L diesel engine on a C-segment car are based on GT-suite. A co-simulation tool, xMOD, is used to connect and simulate together these
components from heterogeneous environments. Test cycles can run offline in xMOD. Every ECU signal and engine parameter can be monitored. The complete chain is validated by comparing simulated signals and emissions to measured vehicle data.
This co-simulation tool is used for ECU software validation and control algorithm development.

The tool is applied to predict the emissions behavior of a calibrated vehicle on the wide range of conditions present on Real Driving Emission (RDE) tests. Delphi has already developed a RDE demonstration vehicle. However, not all combinations can be tested on the vehicle. SEC-in-the-loop simulations are run with several ambient temperatures, pressures and driving profiles. Based on these results, worst case conditions for NOx emissions can be identified and then tested on a vehicle in an environmental wind tunnel. The final vehicle results confirm that the software and
calibration can be RDE compliant, even under the most severe conditions.

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