2 5 F o c u s engine, exhaust gas aftertreatment and the entire system – our approach allows us to optimize development quite significantly,” the expert explaines. AVL experts can draw on a vast database - covering several hundred engine development projects to help them. Added to this, it has data relating to exhaust gas aftertreatment systems and various operation strategies. By combining these empirical data with physical models, the AVL experts can compare different concepts with each other and choose a system at a very early stage of the development. In actual fact, without this model-based approach it would not be possible to achieve this level of efficiency when evaluating the multitude of interactions between the different elements. As soon as there is a prototype engine, it becomes possible to integrate additional measurement quantities determined on the test bed into the mathematical engine model, thereby improving model precision. Exactly the same applies to the data measured later using portable emissions measurement systems (AVL M.O.V.E) inside the vehicle. “In the end, the quality of our simulation model is high enough for the model based approach even to be used for variant calibration. The big advantage of this is that exactly the same model is used from the very first system definition through to series production. Over the course of the development process it undergoes continuous refinement,” the powertrain expert says. AVL’s model-based methodology is just as suited for emission optimization in complex, hybridized drive systems as it is for classical drive solutions. On-board measurements Due to the real-driving emissions regulations, a significant shift is taking place toward in-vehicle emissions measurement. “With its mobile testing platform M.O.V.E, AVL provides a portfolio of measuring devices that allows its customers to run all the required measurements inside the vehicle. The M.O.V.E portfolio today is almost as complete as the portfolio AVL provides for the test bed,” says Roland Wanker, Global Business Segment Manager for Vehicle Testing Systems. Besides having the equipment for gas and particle emission measurement, consumption measurement and indicating, the M.O.V.E portfolio also includes GPS and video systems capable of capturing the respective driving situation with maximum precision. Roland Wanker: “Using the measured data, developers are able to fully reproduce any driving situation and the associated emission behavior. For use throughout the entire development process, the measuring data are consistent and can easily be integrated into existing testing environments.” The data measured with the M.O.V.E system are of a very high quality, ensuring good comparability with tests executed on the engine test bed and the chassis dynamometer. “This is a tremendous advantage for an integrated development process. Apart from that, M.O.V.E permits you to record maneuvers in real, on-road driving situations which can later be used in Real- Life Testing with AVL InMotion on the test bed,” he says. All-in-one solution from one source When it comes to reducing realdriving emissions, AVL can offer its customers an all-in-one solution comprising simulation, system configuration and operating strategy, as well as the required measuring equipment and simulation tools. Michael Weißbäck: “We at AVL are well prepared to handle the future real world emission compliance. AVL’s unique combination of engineering, instrumentation and simulation expertise is a huge benefit to customers working on the optimization of their vehicles’ consumption and exhaust gas emissions.“ < Fotos: AVL > Engine speed / Load Distribution – examples of real world driving vs. test.
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