And this very answer is delivered in the form of a well-structured report. However, the huge amount of measurement data collected in the vehicle is also of great value for the further development of the powertrain and for model creation in virtual development,” Roland Wanker points out. MODEL-BASED ENGINE OPTIMIZATION An example of just what modelbased development can achieve is demonstrated by AVL’s MoBEO method (Model Based Engine Optimization). With this particular methodology, contexts that are easily definable in physical terms are merged with empirical, data-driven models. In a first step, these can be parameterized for a certain engine just from the experience and knowledge AVL has gained in a multitude of engine development projects. This makes it possible to make accurate predications early on when planning the engine concept. “In the course of the development work, tests performed on the real engine in three stages make the model quality more and more representative of the real engine’s consumption and emission values. With this method, AVL has demonstrated in several projects that the pre-calibrations for altitude adjustment and for the impact of hot and cold temperatures performed in the office are of such high quality that they merely require random verification in the field driving test. This helps both to enhance the quality and lower the development costs,” Hans-Michael Koegeler, AVL Skill & Know-how Manager for Calibration Applications, explains. BRINGING THE DRIVING ENVIRONMENT TO THE TESTBED The completion of hardware component development is followed by calibration, the next step in the development process that requires the consideration of a much greater number of driving situations in RDE testing. “For this purpose, we use AVL’s proven CAMEO, a tool that has been extended to include a test designer that uses random driving profiles as 0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 1 5 F O C U S Photos: AVL WLTP NEDC RDE <100km/h US 06 RDE full range Relative Load, % Engine Speed, rpm 200 180 160 140 120 100 80 60 40 20 0 previously in this respect has started to reach its limits, because to fully cover all driving situations, one would require a disproportionately high number of test runs. A solution approach to the problem is offered by model-based development that optimizes the development tasks considerably by employing physical/empirical models for the engine, exhaust gas aftertreatment and the entire system. RDE also entails the need for a new generation of portable emissions measurement systems (PEMS). MOBILE TEST SYSTEM DESIGNED FOR PASSENGER CARS In addition to emission tests run on the chassis dyno with the proven AMA i60 and CVS technology, RDE compliance will in future increasingly require tests to be conducted under real-world conditions. Added to the gaseous emission components (NO/NO2 and CO/CO2), it has now become necessary to measure the particle numbers in the vehicle too. With its new M.O.V.E iS system, AVL can now offer you the perfect and complete solution for passenger cars and the light-duty sector. “For use in passenger cars, we have adapted the AVL M.O.V.E measurement system in all the relevant areas to meet the altered requirements – in view of safety, ease of use and data management,” says Roland Wanker, Global Business Segment Manager for Vehicle Testing Systems. The compact and aerodynamically optimized measuring system is quickly mounted on the trailer hook with very little effort, and no other vehicle modifications are needed. Also, the methodology of test execution and evaluation has undergone considerable optimization. “Very often all the customer wants to know is: Has my vehicle passed the RDE test or not? > Engine Speed/Load Distribution – RDE compared to legally required cycles.
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