The explanations show the challenges, potentials and benefits of a seamless simulation method for the evaluation of driver assistance functions. The tried and tested vehicle dynamics simulation environment CarMaker has been extended to a comprehensive development platform for model based testing of different assistance systems in the framework of the presented work. Especially for ACC based systems a scenario and evaluation catalogue has been developed and integrated in the simulation environment. The result of this work is a completely implemented test package that can be seamlessly used for MIL, SIL and HIL. The package contains extensive scenarios that are necessary for the test of functions, failures, fail-safe routines and the controller performance of the systems. It exceeds the possibilities of driving tests on the track many times over. The user performs all of the important tests automatically using a mouse click via the test scenario manager within the graphical user interface of CarMaker. He does not have to worry about the programming of traffic scenarios and model details. The results are provided in an automatically generated test protocol after the simulation. As OEMs are bringing not only systems of longitudinal control but also systems of lateral control to the market the implemented test package for ACC based systems is planned to be extended for systems like lane departure warning, lane keeping assistance, the parking assistant and further systems. In the scope of this work the driver model will be advanced, too. At the current development stage the virtual driver lets itself overcontrol by the controller, but it does not respond on a steering torque intervention. In order to reproduce the human reaction on such an intervention the behavior of human drivers are measured and analyzed regarding typical patterns of behavior. These experiences are used to develop a control strategy to be implemented into the driver model. A further application potential of the event based testing is to examine systematically the influence of driver assistance systems on fuel consumption and CO2 emissions. The possibility to integrate a detailed and precise drive train model with engine, clutch, differentials and control programmes into CarMaker is already existing. It enables to analyze the influence of single vehicle components on fuel consumption in realistic driving cycles with longitudinal, lateral and vertical dynamics. In line with the presented work special driving maneuvers are therefore planned to be developed to represent the effects of driver assistance systems on fuel consumption. Another challenge will pose the hardware-in-the-loop testing of camera based driver assistance systems. It will raise the question where the cut between real hardware and the virtual environment is to be set. If the camera, for example, should be tested in-the-loop first approaches already exist that project the animation in front of the camera, similar to the set-up of a driving simulator. This means the animation will be continuously gaining importance for the model based development of the systems. Up to now it has 'only' been an intuitive analysis tool. But when testing camera based systems it will represent the necessary interface between the virtual and real world.
Simulation methods to evaluate and verify functions, quality and safety of advanced driver assistance systems in a continuous MIL/SIL/HIL process
2009
13 Seiten, 7 Bilder, 1 Tabelle, 5 Quellen
Aufsatz (Konferenz)
Englisch
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