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Garage Shift Calibration for Automatic Transmission in Front Wheel Drive Powertrains
Technical Paper
2015-36-0331
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
In order to illustrate the constant development of the automatic transmission controls area, this paper describes how the garage shift calibration works in vehicles with transverse front wheel drive powertrains.
A garage shift (GS) is the turbine speed transient commanded by the shift lever movement from Park to Drive or Reverse, from Neutral to Drive or Reverse, from Drive to Reverse, from Reverse to Drive, or from Drive or Reverse to Neutral [1].
A usual metric to verify the garage shift comfort is the data acquisition of the fore-aft acceleration on the seat track, but also the shift time should be considered, as well as the clutch energy and the repeatability of the shift feeling for different temperatures and engine idle speed levels.
This paper demonstrates the transmission calibration strategies to determine a sensitive and a non-sensitive garage shift and its interactions with the engine calibration.
Many factors may affect the garage shift calibration, like hardware controls (software and calibration), hydraulic system (fluid and actuators), clutches (design and friction material) step ratios, and non-transmission factors such as idle control and engine torque signal accuracy [2]. The vehicle’s sensitivity to torsional driveline inputs and the powertrain mounts configuration also influence the shift quality perception.
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Authors
Topic
Citation
Arruda, J., Assis, E., Ujino, R., Bastos, E. et al., "Garage Shift Calibration for Automatic Transmission in Front Wheel Drive Powertrains," SAE Technical Paper 2015-36-0331, 2015, https://doi.org/10.4271/2015-36-0331.Also In
References
- Nessler G. , Stokes W. , Beikmann R. , Curtis J. and Mitchell T. Roll-Down Process Development for Transmission Garage Shift Quality SAE Technical Paper 2011-01-1500
- 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
- Marano , J. E. , Moorman , S. P. , Whitton M. D. and Willians R. L. Clutch-to-Clutch Transmission Control Strategy SAE Technical Paper 2007-01-1313
- Narita Y. Improving Automatic Transmission Shift Quality by Feedback Control with a Turbine Speed Sensor SAE Technical Paper 911938
- Narita Leo F. Schwab Development of a Shift Quality Metric for an Automatic Transmission SAE Technical Paper 941009
- GM Powertrain Hydra-Matic 6T40/45 Technician’s Guide General Motors Corporation 2008
- BMW Automatic Transmission Guide - P3 8 14
- Govindswamy K. , Hueser M. Developed on the Quiet Engine Technology International March 2002 44 47