Due to the deviation of greenhouse gas and pollutant emissions under laboratory and real conditions from passenger vehicles, the European Commission has adopted stricter limit values and the RDE test procedure for the approval of future vehicles. This is why novel methods for the virtual development and optimization of conventional and alternative drive systems are becoming increasingly relevant.
In this project a software for real-time emission prediction based on detailed chemistry in an innovative hardware-in-the-loop environment will be developed. In order to enable a fast and accurate prediction of particle emissions, a soot model for tabulated chemistry is developed. The aim is to be able to calculate the emission formation in real time under all operating conditions. A co-simulation for the complete powertrain simulation will be integrated into the combustion model. A functional mockup interface will be developed for this purpose. Finally, the models are validated in a hardware-in-the-loop environmennt with a real ECU in defindes test cases.
First, the model domain for the internal combustion engine is divided into the combustion (emissions) in the cylinder and the air path (the remaining components, including the exhaust gas recirculation and the turbocharger). The model interfaces will be modelled and functionally tested. At the same time, a reference engine is currently being selected to parameterize the combustion and air path models and required operating conditions have been determined. The models are parameterized in the current project phase. For communication with the other domains, the interface standard, the Functional Mockup Interface (FMI), is integrated. To enable communication within the RDE software, the Functional Mockup Interface (FMI) is integrated. The Hardware-in-the-Loop (HiL) simulation environment is implemented on the SCALEXIO, HiL Simulator from dSPACE. The detailed analysis of the real-time execution of the new LOGE-SW together with the other domains at the VKA will be investigated to ensure robust and correct execution for early model development. The LOGE-SW will be integrated directly into a Simulink-based environment, which will be executed in real-time on the SCALEXIO system.
Different frameworks containing the combustion model LOGE and the powertrain have been investigated. For Model-in-the-Loop (MiL) applications, an "onion" structure was specified and investigated:
- The LOGE combustion model is calibrated and compiled into a .dll file and integrated into the GT-Power environment.
- The GT-Power Fast Running Model (FRM), which contains the compiled combustion model, is executed from the GT-Suite library in the Simulink environment, where the rest of the air path is modelled.
Two scenarios are performed for the HiL application:
- The LOGE-SW (combustion) is integrated as FMI as a sub-domain of the Simulink-based mean value model of RWTH
- The LOGE-SW (combustion) is integrated as FMI as a sub-domain of dSPACE's Simulink-based mean value model (ASM)