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Aspects of Shift Quality With Emphasis on Powertrain Integration and Vehicle Sensitivity
Technical Paper
2005-01-2303
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
A customer's perception of vehicle quality very closely parallels the noise vibration and harshness (NVH) characteristics of the vehicle. Consequently, automotive manufacturers are investing significant resources into optimizing the NVH performance of their vehicles. Automatic transmission shift quality is one of a number of attributes where NVH optimization is critical towards providing customers with a pleasant driving experience. This paper addresses various aspects of understanding, quantifying and optimizing a vehicle's shift quality characteristics.
Following an introductory treatment of automatic transmission planetary gear systems, the interaction between the engine/transmission system during shifts is summarized. Various shift quality metrics used to quantify a vehicle's response and its sensitivity to transient inputs are provided. Approaches to manage the engine torque output during the shifts are discussed. Examples from various case studies are used to show the influence of the interaction between engine/transmission as well as the vehicle's sensitivity on the overall perceived shift quality behavior of the vehicle. The examples considered show how refined powertrain controls and upfront vehicle sensitivity considerations can be used to achieve superior shift quality.
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D'Anna, T., Govindswamy, K., Wolter, F., and Janssen, P., "Aspects of Shift Quality With Emphasis on Powertrain Integration and Vehicle Sensitivity," SAE Technical Paper 2005-01-2303, 2005, https://doi.org/10.4271/2005-01-2303.Also In
References
- Govindswamy K. Hueser M. “Developed on the Quiet” Engine Technology International March 2002 44 47
- Scherer H. “ZF 6-Speed Automatic Transmission for Passenger Cars” SAE Paper 2003-01-0596
- Duffy J. “Modern Automotive Technology” The Goodheart-Willcox Company, Inc. Illinois 2000
- Watechagit S. Srinivasan K. “Modeling and Simulation of a Shift Hydraulic System for a Stepped Automatic Transmission” SAE-Paper 2003-01-0314
- Wallentowitz H. “Längsdynamik von Kraftfahrzeugen” Lecture Script RWTH Aachen
- Megli T. Haghgooie M. Colvin D. “Shift Characteristics of a 4-Speed Automatic Transmission” SAE-Paper 1999-01-1060
- Martin B. Redinger C. Dourra H. “Chrysler 45RFE: A New Generation Real-Time Electronic Control RWD Automatic Transmission” SAE-Paper 1999-01-0755
- Horste K. “Objective Measurement of Automatic Transmission Shift Feel Using Vibration Dose Value” SAE Paper 951373
- Fahy F. Walker J. “Fundamentals of Noise and Vibration” E & FN Spon New York 1998
- Norton M. “Fundamentals of Noise and Vibration Analysis for Engineers” Cambridge University Press Great Britain 1996
- Govindswamy K. Hueser M. D'Anna T. Diemer P. “Study of Low-Frequency Driveline Clunk During Static Engagements” SAE-Paper 2003-01-1480
- Govindswamy K. Albright M. “Conditioned NExT Analysis, A Technique for Estimation of Modal Damping Ratios of Operating Piston Engines” SAE Paper 1999-01-1751