Browse Publications Technical Papers 2011-01-1428
2011-04-12

Gen2 GF6 Transmission Hardware and Controls Updates 2011-01-1428

In an effort to increase fuel economy and improve shift quality - the GF6 family of General Motors transmissions has been analyzed for potential enhancements. The focus of this analysis was to improve fuel economy, while increasing downshift responsiveness, and manual mode sport delays.
This paper describes a variety of the hardware philosophy changes, and control methods which have contributed to the next generation of GM clutch-to-clutch 6-speed transmissions. These changes to hardware and controls have led to a composite fuel economy improvement of 4.5% with no changes to shift or torque-converter scheduling. In addition, the downshift responsiveness has been significantly improved to reduce delay times by approximately 50% while virtually eliminating the dependency on engine torque reductions - ultimately allowing for stacked downshifts to progress with minimal, if any, time between shifts. Additionally, “tap shift” delays have been significantly decreased to levels near 150 ms.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Members save up to 18% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:
TECHNICAL PAPER

A New Archetype of Automatic Transmission

2011-01-1429

View Details

JOURNAL ARTICLE

Two-Phase MRF Model for Wet Clutch Drag Simulation

2017-01-1127

View Details

TECHNICAL PAPER

Mechanism of Neutral-Idle Shudder Phenomenon in an Automatic Transmission System

2016-01-1128

View Details

X