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Sound Optimization for Downsized Engines
Technical Paper
2014-01-2040
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Today, the number of downsized engines with two or three cylinders is increasing due to an increase in fuel efficiency. However, downsized engines exhibit unbalanced interior sound in the range of their optimal engine speed, largely because of their dominant engine orders. In particular, the sound of two-cylinder engines yields half the perceived engine speed of an equivalent four-cylinder engine at the same engine speed. As a result when driving, the two-cylinder engine would be shifted to higher gears much later, diminishing the expected fuel savings.
This contribution presents an active in-car sound generation system that makes a two-cylinder engine sound like the more familiar four-cylinder engine. This is done by active, load-dependent playback of signals extracted from the engine vibration through a shaker mounted on the firewall.
A blind test with audio experts indicates a significant reduction of the engine speed when shifting to a higher gear. In the blind test, experts favored the interior sound of the proposed sound generation system and perceived better interaction with the vehicle.
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Citation
Sontacchi, A., Frank, M., Zotter, F., Kranzler, C. et al., "Sound Optimization for Downsized Engines," SAE Technical Paper 2014-01-2040, 2014, https://doi.org/10.4271/2014-01-2040.Also In
References
- Brandl , S. , and Graf , B. Sound Engineering for Electric and Hybrid Vehicles. Procedures to create appropriate sound for electric and hybrid vehicles 1 st International Electric Vehicle Technology Conference Yokohama 2011
- Graf , B. , Resch , M. , Maunz , C. , Dolinar , A. et al. Sound Engineering for Downsized Engines JSAE Annual Spring Congress Yokohama 2011
- Graf , B. , Brandl , S. , Rust , A. Sound Solutions for Downsized Powertrains DAGA 2012 Darmstadt 2012
- Brandl , S. , Graf , B. , and Rust , A. NVH Challenges and Solutions for Vehicles with Low CO2 Emission SAE Int. J. Passeng. Cars - Mech. Syst. 5 3 1084 1090 2012 10.4271/2012-01-1532
- Alt , N. , and Jochum , S. Sound-Design unter den Aspekten der Harmonielehre der Musik MTZ 1 2003 10.1007/BF03226679
- Frank , M. , Zotter , F. , Sontacchi , A. , Brandl , S. et al. Comprehensive Array Measurements of In-Car Sound Field in Magnitude and Phase for Active Sound Generation and Noise Control SAE Technical Paper 2014-01-2046 2014 10.4271/2014-01-2046