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Geely Hybrid System’s Noise, Vibration, and Harshness Development
ISSN: 0148-7191, e-ISSN: 2688-3627
Published July 01, 2020 by SAE International in United States
This content contains downloadable datasetsAnnotation ability available
Event: Automotive Technical Papers
During the development of the Geely Hybrid System (GHS), which combines a 15T Miller engine with an Electric Motor (EM) integrated into a 7-speed Dual-Clutch Transmission (P2.5), several hybrid-specific Noise, Vibration, and Harshness (NVH) issues have been encountered.
The technology used, the system features, and the hybrid operating modes are analyzed. Changes within driving modes and their transitions are among the new challenges faced by NVH and system engineers [1, 2, 3]. The lack of engine combustion noise masking during electric drive and hybrid mode brings new requirements for gear design and structural integrity. These requirements ensure the system is robust and insensitive to the excitation. Attachment points and its dynamic stiffness are important to prevent structure-borne frequency content of gear whine and EM magnetic noise being transmitted to the vehicle cabin via powertrain mounts. Idle speed selection has also become an important requirement to keep a suitable NVH comfort.
This paper exposes the main challenges, root causes, and countermeasures applied during pure electric mode and combustion engine idle speed selection in order to create a competitive and refined hybrid propulsion system.
CitationGaranto, V., Geng, Z., Hu, J., Su, H. et al., "Geely Hybrid System’s Noise, Vibration, and Harshness Development," SAE Technical Paper 2020-01-5063, 2020, https://doi.org/10.4271/2020-01-5063.
Data Sets - Support Documents
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- Brandl, S., Biermayer, W., Graf, B., and Resh, T. , “Hybrid Vehicle’s NVH Challenges and Influences on the NVH Development,” SAE Technical Paper 2016-01-1837, 2016, https://doi.org/10.4271/2016-01-1837.
- Govindswamy, K., Wellmann, T., and Eisele, G. , “Aspects of NVH Integration in Hybrid Vehicles,” SAE Technical Paper 2009-01-2085, 2009, https://doi.org/10.4271/2009-01-2085.
- Tousignant, T., Govindswamy, K., Stickler, M., and Lee, M. , “Vehicle NVH Evaluations and NVH Target Cascading Considerations for Hybrid Electric Vehicles,” SAE Technical Paper 2015-01-2362, 2015, https://doi.org/10.4271/2015-01-2362.
- Sarrazin, M., Janssens, K., and Van der Auweraer, H. , “Virtual Car Sound Synthesis Technique for Brand Sound Design of Hybrid and Electric Vehicles,” SAE Technical Paper 2012-36-0614, 2012, https://doi.org/10.4271/2012-36-0614.
- Poxon, J., Jennings, P., and Allmann-Ward, M. “Development of a Hybrid Electric Vehicle (HEV) Model for Interactive Customer Assessment of Sound Quality,” in Hybrid & Eco-Friendly Vehicles Conference, Coventry, United Kingdom, 2008.
- Govindswamy, K., Eisele, G. “Sound Quality of Electric Vehicles,” SAE Technical Paper 2011-01-1728, 2011, https//doi.org/10.4271/2011-01-1728.
- Yoshioka, T. and Sugita, H. , “Noise and Vibration Reduction Technology in Hybrid Vehicle Development,” SAE Technical Paper 2001-01-1415, 2001, https//doi.org/10.4271/2001-01-1415.
- Brandl, S. and Graf, B. , “Sound Engineering for Electric and Hybrid Vehicles - Procedures to Create Appropriate Sound for Hybrid and Electric Vehicles,” SAE Technical Paper 2011-39-7228.