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Diesel Combustion Mode Switching - A Substantial NVH Challenge
Technical Paper
2009-01-2080
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Tier 2, bin 5 diesel engines may use multiple combustion modes to achieve stringent emissions requirements. Unfortunately, switching between different combustion modes can cause step changes in noise that will be unacceptable to consumers. In this paper, several sound quality metrics are evaluated for their ability to quantify the NVH issues that arise during a rich pulse event. In addition, techniques are presented that allow an engine developer to reduce the NVH effects caused by changing combustion modes. Careful calibration tuning in close cooperation with performance and emissions development engineers is required to solve noise problems that arise from combustion mode switching events, since an NVH improvement may often come at the expense of a performance or emissions issue.
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Topic
Citation
Reinhart, T., "Diesel Combustion Mode Switching - A Substantial NVH Challenge," SAE Technical Paper 2009-01-2080, 2009, https://doi.org/10.4271/2009-01-2080.Also In
References
- Fuerhapter A. Unger E. Piock W. F. Fraidl G. K. “The new AVL CSI engine - HCCI operation on a multi-cylinder gasoline engine” SAE Paper 2004-01-0551 March 2004