Optimally chosen drive train components are absolutely necessary in order to guarantee the efficiency of a vehicle and to meet the legal regulations. In this contribution, methods of efficiency evaluation for the drive trains of commercial vehicles and mobile machines under the above-mentioned aspects will be presented. First, an evaluation schema based on a survey among experts will be presented which makes it possible to correlate the vehicle class to be examined with the optimal drive train configuration. This correlation is based on the generation of a vehicle requirement profile, which is compared with different drive train configurations. Moreover, possibilities of collecting and processing load data are presented, which enable the demands of a vehicle type to be optimally made available for simulation. In this contribution, different possible approaches for the efficiency evaluation of mobile machines and commercial vehicles have been described. In principle, subjective and objective assessment methods must be distinguished. One possible subjective method has been presented here. Its advantage is the possibility of emotional evaluation and the inclusion of experts' knowledge. The specific choice of the evaluating experts allows the result to be given different accents. It is possible to ask experts from the areas of development or application, which enables current wishes of the customers in addition to technical questions to be taken into consideration. Due to its principle, however, subjective assessment has the disadvantage that the subconscious weighting of certain factors already results in a ranking. Moreover, it does not provide any tangible results which could be expressed in technical or monetary values. Efficiency evaluation based on typical load courses is considerably more complex, in particular with regard to load data collection and processing. Modifications of the evaluation structure, however, can be realized more easily. In addition, other aspects beyond the evaluation of economic efficiency, such as the emissions of a drive variant concept, can be considered. Therefore, it depends on the goal which method is appropriate. This decision must be made in each individual case.
Methods for benchmarking the efficiency of mobile working machines and heavy duty vehicles
Methoden zur Effizienzbewertung mobiler Arbeitsmaschinen und schwerer Nutzfahrzeuge
2008
11 Seiten, 6 Bilder, 5 Quellen
Conference paper
English
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