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Saturn Engine Stop-Start System with an Automatic Transmission
ISSN: 0148-7191, e-ISSN: 2688-3627
Published March 05, 2001 by SAE International in United States
Annotation ability available
Event: SAE 2001 World Congress
Due to environmental and legislative concerns, less polluting and more efficient vehicle powertrain systems must be developed. A first step is a simple, low cost system such as the presented Engine Stop-Start (ESS) system. A 1.9 liter four-cylinder spark-ignition engine with a four-speed automatic transmission was modified to enable fuel off-on transitions during decelerations and stops. Additional hardware includes a 7 kW electric motor-generator, a power electronics module with an inverter and a DCDC converter, a 36 Volt nominal battery system, and minor modifications to the transmission. A control scheme was developed which takes advantage of the system's fuel saving potential while minimally affecting driveability. Tests have shown EPA City fuel economy gains of approximately 12-14 percent while maintaining the same emissions classification. The EPA Highway fuel economy was increased by approximately 1 percent.
CitationTamai, G., Hoang, T., Taylor, J., Skaggs, C. et al., "Saturn Engine Stop-Start System with an Automatic Transmission," SAE Technical Paper 2001-01-0326, 2001, https://doi.org/10.4271/2001-01-0326.
- Kanai, H. Hirose, K. Ueda T. Yamaguchi, K. Toyota Motor Corporation “Hybrid Vehicle Technology for a Comfortable Ride” Engine Technology Progress in Japan, Inter-Tech Energy Progress July 1998