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Combustion Assisted Belt-Cranking of a V-8 Engine at 12-Volts
Technical Paper
2004-01-0569
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Implementation of engine turnoff at idle is desirable to gain improvements in vehicle fuel economy. There are a number of alternatives for implementation of the restarting function, including the existing cranking motor, a 12V or 36V belt-starter, a crankshaft integrated-starter-generator (ISG), and other, more complex hybrid powertrain architectures. Of these options, the 12V belt-alternator-starter (BAS) offers strong potential for fast, quiet starting at a lower system cost and complexity than higher-power 36V alternatives. Two challenges are 1) the need to accelerate a large engine to idle speed quickly, and 2) dynamic torque control during the start for smoothness. In the absence of a higher power electrical machine to accomplish these tasks, combustion-assisted starting has been studied as a potential method of aiding a 12V accessory drive belt-alternator-starter in the starting process on larger engines.
The combustion-assisted cranking system has been implemented on a 5.3L V-8 engine with automatic transmission in a full-size truck. Integration of the BAS system controls with powertrain fuel and spark management shows the importance of combustion-assist within the first several compression events. The use of a cylinder-event-based (CEB) spark strategy was found to benefit the feel of auto-starts, as measured by passenger seat track vibrations. Introducing fuel into the cylinders during the shutdown showed up to 40% improvement in engine start times. Furthermore, this paper reports the feasibility of auto-starts from shutdown fuel in terms of start consistency and shows the need for a quick synchronization process of the powertrain control module if a 12-volt system is to be successfully used.
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Wezenbeek, P., Evans, D., Sczomak, D., Absmeier, J. et al., "Combustion Assisted Belt-Cranking of a V-8 Engine at 12-Volts," SAE Technical Paper 2004-01-0569, 2004, https://doi.org/10.4271/2004-01-0569.Also In
References
- Pollom, M. Evans, D. Poulos, S. Van Maanen, K. Zarger, T. “Powertrain Architecture and Controls Integration for General Motors Corporation's Hybrid Full-Size Pickup Truck” SAE Technical Paper number 2003-01-0085 2003
- Simopoulos, G. MacBain, J. Schneider, E. Wingeier, E. “Fuel Economy Improvements in an SUV Equipped with an Integrated Starter Generator” SAE Technical Paper number 2001-01-2825 2001
- Itagaki, K. Teratani, T. Kuramochi, K. Nakamura, S. Tachibana, T. Nakao, H. Kamijo, Y. “Development of the Toyota Mild-Hybrid System (THS-M)” SAE Technical Paper number 2002-01-0990 2002