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Based on customer application and loading condition, each Commercial Vehicle model has an entirely different usage pattern. To perform accurate durability validation, each vehicle model prototype should run on actual customer usage locations and loading conditions for the durability target kilometers. But it is time consuming and not practical. So a statistical approach is followed to generate the accelerated durability test sequence and target on in-house Proving Ground tracks to match the real customer usage for the durability target kilometers. Again a single durability test sequence and target cannot be followed for all vehicle models due to the variability in customer usage. For that, specific durability test sequence and target need to be established for every class of commercial vehicle. This paper summarizes the methodology to develop Durability test sequence and target for commercial vehicle based on the work carried out on variants of medium and heavy duty trucks.

With growing fuel prices and global warming, fuel economy improvement and reduced emissions are becoming order of the day. Automobile manufacturers around the world are in increasing pressure to achieve the same, also keeping in account the stiff timelines required in the product developmental cycle. Condensed duty cycle that is representative of several days of actual real life running is developed for quicker fuel economy tuning on a chassis dynamometer. This paper presents a new methodology to obtain a synthetic drive duty cycle, which matches engine operating conditions of the actual real life cycle accurately and thereby providing a more accurate match in fuel economy. Drive duty cycle (vehicle velocity profile) used in this study is extracted from the instrumented vehicle in the real traffic condition (peak/lean hour) of major cities in India at different location/load conditions. Each recorded trip is further divided into micro trips.