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Evaluation of a New Method for Customer-Orientated Rating of Clutch Systems in Conceptual Hybrid Vehicles

[+] Author Affiliations
Friedrich Brezger, Albert Albers

IPEK - Institute of Product Engineering at KIT, Karlsruhe, Germany

Paper No. IMECE2013-63401, pp. V013T14A013; 8 pages
  • ASME 2013 International Mechanical Engineering Congress and Exposition
  • Volume 13: Transportation Systems
  • San Diego, California, USA, November 15–21, 2013
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-5642-0
  • Copyright © 2013 by ASME


Coming to hybrid vehicles regarding passenger cars there is still no final answer which hybrid topology is the best system for the market. In European countries the focus is clearly set on energy efficiency or rather on carbon dioxide emission and production costs. There are several innovative hybrids available on the market coming with different advantages for the different customers respectively driver types.

Well-known test cycles like the NEDC (Europe), the 10–15 Mode (Japan), the FTP72&FTP75 (USA) do provide an answer to the question of energy efficiency. But it is also known that this information is not necessarily valid for the special customers’ driver behavior.

For the product development process a tool is required to rate the different hybrid topologies and their components as well as their scales. One aspect is efficiency in additional consideration of the customer classes. Along the dimensioning of possible abuse maneuvers the average performance is important.

In this paper a user-friendly tool for measuring driving data is introduced in order to investigate its sufficiency to evaluate different driver behaviors. This tool uses an OBD-to-Bluetooth-device in combination with a smartphone with GPS. The advantage of this devices compared with a conventional autobox is its low cost and its simple use for all kinds of customers. This fast gained data is processed using probability density functions to create customer classes and representative reference cycles. In a second step a generic hybrid topology with an operation strategy is introduced due to include a detailed clutch system model. This clutch system model has a high fidelity regarding its drag torque behavior. The influence of little improvements at specific operating points on the drag torque will be evaluated. As a result the utility analyses show the efficiency improvement concerning the different driver classes. Thereby a sustained recommendation on further efforts for clutch optimization and its target characteristics can be proposed.

Copyright © 2013 by ASME



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