Abstract
An increasingly comprehensive range of propulsion systems with additional combinations of combustion engines and electrical drives, the development of energy recuperation systems as well as increasing demands on vehicle endurance tests require a sustainable optimization of testing procedures. The transfer of endurance tests from the road to the roller chassis dynamometer allows a significant reduction of testing time and that combined with a substantial reduction of effort.
This paper first examines to which extent the real loading conditions of a street endurance test of the vehicle power train can be reproduced on a conventional free jet roller chassis dynamometer. The results show that the current state of the roller chassis dynamometer technology is not yet sufficient to achieve this target. Within the framework of this paper, the functionality of conventional roller chassis dynamometers could be enhanced by different optimization methods.
In order to review the quality of the results of the optimized roller chassis dynamometer, two identical vehicles are built for a comparative test. While the first vehicle runs the entire distance of the endurance test on the test track, the second vehicle performs the same test procedure and distance on the optimized free jet roller chassis dynamometer. A comparison of the subsequent test results of the two vehicles shows that a transfer of the endurance test from the test track to a roller chassis dynamometer is feasible. Therefore, the basis for the requested transfer of the endurance test of a vehicle power train from the street or test track to a roller chassis dynamometer is given.
Keywords: endurance test, roller chassis dynamometer, accelerated test process, test track, center of gravity fixation