Browse Publications Technical Papers 2003-01-0248
2003-03-03

A Five-Speed Starting Clutch Automatic Transmission Vehicle 2003-01-0248

A wet multi-plate clutch, designated as the “starting clutch”, is used to replace the torque converter in the automatic transmission in order to improve vehicle fuel economy. The transmission ratio spread must be increased to compensate for the torque multiplication of the torque converter and avoid penalizing the 0-60 mph acceleration performance. The main challenge of this concept is the control of the starting clutch to ensure acceptable vehicle drivability. This paper describes the system of a five-speed starting clutch automatic transmission vehicle and shows vehicle test results. Vehicle test data show that (i) the fuel economy benefit of the starting clutch is significant, and (ii) a starting clutch transmission can be designed to equal or better the 0-60 mph acceleration performance of a torque converter transmission by proper selection of the gear ratios.

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

Fuel Economy and Performance Potential of a Five-Speed 4T60-E Starting Clutch Automatic Transmission Vehicle

2003-01-0246

View Details

JOURNAL ARTICLE

New Generation Hydraulic-Mechanical Transmission with Lock-up Mechanisms and Automatic Start Clutch

2008-32-0040

View Details

TECHNICAL PAPER

Vehicle Implementation of a GM RWD Six-Speed Integrated-Friction-Launch Automatic Transmission

2007-01-3747

View Details

X