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Improved Comfort Analysis and Drivability Assessment by the Use of an Extended Power Train Model for Automatic Transmissions

SAE International Journal of Passenger Cars - Mechanical Systems

AVL LIST GmbH-Klaus Meitz
Gesellschaft für Industrieforschung mbH-Sigrid Klinger
  • Journal Article
  • 2012-01-1529
Published 2012-06-13 by SAE International in United States
The new generation of automatic transmissions is characterized by a compact and highly efficient design. By the use of a higher overall gear ratio and lightweight components combined with optimal gear set concepts it is possible to improve significantly fuel consumption and driving dynamics. Precise and efficient real time models of the whole power train including models for complex subsystems like the automatic transmission are needed to combine real hardware with virtual models on XiL test rigs. Thereby it's possible to achieve a more efficient product development process optimized towards low development costs by less needed prototypes and shorter development times by pushing front loading in the process.In this paper a new real time model for automatic transmissions including approved models for the torque converter, the lock-up clutch and the torsional damper are introduced. At the current development stage the model can be used for comfort analysis and drivability assessment. Thereby various operating conditions including motored engine and an open, slipping or locked clutch condition can be simulated. For the torque converter a map based,…
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Influence of Low-Frequency Powertrain-Vibrations on Driveability-Assessments

AVL LIST GmbH-Josef Zehetner, Klaus Meitz
Karlsruhe Inst. of Technology-Albert Albers, Christian Zingel
Published 2010-06-09 by SAE International in United States
Cost- and time-efficient vehicle development is increasingly depending on the usage of adequate software tools to enhance effectiveness. The aim is a continuous integration of simulation tools and test environments within the vehicle development process in order to save time and costs.This paper introduces a procedure to reveal the cause of low-frequency powertrain vibrations and the influences on the dynamic behavior of a vehicle on a roller test bench. The affected longitudinal acceleration signal is an arbitrative criterion for the driveability assessment with AVL-DRIVE™, a well-known driveability analysis and development tool for the objective assessment concerning NVH and driveability aspects of full vehicles. These experimental studies are embedded into an approach, which describes the functional assembly of three applied test environments "road," "roller test bench" and "simulation" with according tools in order to facilitate an integrated driveability development process.The low powertrain vibrations are identified by performance of positive load-change maneuvers (Tip-In) in the vehicle on a roller test bench. A parallel recording of acceleration signals by the driveability analysis sensor system and of defined surfaces…
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Simulation of Driveability in Real-time

AVL List Gmbh-Josef Zehetner, Peter Schöggl, Matthias Dank, Klaus Meitz
Published 2009-04-20 by SAE International in United States
In this article a new approach for a combined optimization of performance, emissions, fuel consumption and driveability is presented. Traditionally the development of performance, emissions and consumption takes place on drivetrain testbeds and on chassis dynos. The development of driveability is done in vehicle tests very late in the development phase for which AVL-DRIVE™ is used by many OEMs for the objective evaluation of driveability.The so-called “Vehicle Simulation Model” VSM is a framework for the simulation of driveability in real time. Its flexible model structure as well as the tight connection to AVL-DRIVE™ offers the possibility to integrate the optimization of driveability in earlier development steps and therefore neglect repeating loops in the development caused by e.g. not fulfilled driveability targets.
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