This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
E3 System – A Two speed Accessory Belt Drive System for Reduced Fuel Consumption
Technical Paper
2008-01-1521
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
All vehicles have some or all accessories such as alternators, air conditioner compressors, power steering pumps, and water pumps. These devices are mounted on the front of the engine and are powered by a pulley mounted on the front of the crankshaft. This power represents a parasitic loss and this loss is greater at higher engine speeds. To reduce the impact of the accessories on the engine, a two speed transmission that reduces the accessories speed at off-idle conditions was designed, implemented, and tested on several vehicles. The vehicles were tested for fuel economy on the Japanese 10.15 Mode driving cycle, the FTP75 city cycle, and the HWFET Highway Cycle. Results showed an average of 5% reduction in fuel consumption and a corresponding 5% in CO2 with no impact of accessory performance and vehicle drivability. Simulations with GT-Drive software was used to determine the optimum speed reduction and the threshold switching speed that maximizes fuel savings. In this paper we present the system design, its operating characteristics and results of fuel economy testing and drivability assessments.
Recommended Content
Authors
Citation
Ali, I., Yang, K., and Kim, S., "E3 System – A Two speed Accessory Belt Drive System for Reduced Fuel Consumption," SAE Technical Paper 2008-01-1521, 2008, https://doi.org/10.4271/2008-01-1521.Also In
References
- Yasuhara Shinji Tamagawa Takao Hasuda Yasuhiko et al. “Continuously Variable Accessory Drive System” SAE 970007 1997
- Kawarai, M. et al. “Development of Continuously Variable Transmission for Auxiliary Components” Proceedings, JSAE No.934 61 68 1993
- Serkh Alexander “Two Speed Transmission and Belt Drive System” United States Patent Application Publications 2005
- Ali, Imtiaz “The Gates E 3 Drive - A Simple Solution to a Parasitic Problem” 37 38 July/August 2007