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A/C Moan - its Diagnostics and Control
Technical Paper
2009-01-2054
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Air-conditioning (A/C) induced moan is a very commonly observed phenomenon in automotive refrigerant systems. Since most of the automotive A/C systems cycle ON/OFF four to six times every minute, the A/C induced moan is quite readily audible under engine idle and even while driving, especially under lower engine/vehicle speeds. It is not unusual for an A/C compressor to moan or not, on some vehicle/s under certain operating conditions. Most of the OEMs resolve or suppress the A/C moan potential to barely audible levels. However, under some unique and extreme operating conditions, A/C moan is quite readily induced and often results in customer complaints.
This paper discusses A/C moan related root-causes, sources and paths of propagation. A systematic diagnostic test-procedure is also described to diagnose and develop the needed most cost-effective design-fixes. Finally, based on this case-study - some objective targets are recommended to suppress the A/C moan to acceptable levels.
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Citation
Thawani, P. and Liu, Z., "A/C Moan - its Diagnostics and Control," SAE Technical Paper 2009-01-2054, 2009, https://doi.org/10.4271/2009-01-2054.Also In
References
- Thawani, P. Liu, Z. Venkatappa, S. Hsieh, H. “Automotive Air-conditioning Compressor Induced Moans” Inter-Noise 2006 3-6 Dec 2006 Honolulu, Hawaii, USA
- Sohaney, R. Thawani, P. Humbad, N. “Objective Metrics for In-vehicle Steady State Refrigerant System Noise” Sound Quality Symposium 98 Ypsilanti, MI. April 1998
- Thawani, P. Liu, Z. Venkatappa, S. “Objective Metrics for Automotive Refrigerant System Induced Transients” SAE Paper 2005-01-2501 , SAE Noise and Vibration Conference and Exposition 2005