Qirun Customized Solutions Improve NVH Performance of Luxury Vehicle Air Conditioning Systems

During the development of a new-generation flagship sedan, a German luxury automotive brand faced challenges with noise, vibration, and harshness (NVH) in the air-conditioning system. In particular, the pulsating noise of compressor control valves under idling and low-speed conditions affected driver comfort. After evaluating multiple suppliers, the brand partnered with Qirun Auto Parts for a tailored solution.

Challenges in NVH Performance

• Ultra-low noise requirements: Valve operating noise under idling must not exceed 30dB(A), 10dB lower than industry standard.
• Zero pulsation: Pressure fluctuations controlled within ±0.02MPa, much lower than conventional ±0.05MPa.
• High-precision flow control: Full-range flow accuracy required ±2%, surpassing the industry norm of ±5%.
• Extreme temperature adaptability: Stable performance from -40℃ to 120℃.

Innovative Customized Solutions by Qirun

After six months of research and development, Qirun’s technical team implemented a series of advanced solutions for luxury automotive AC systems:

• Multi-Cavity Noise Suppression Design: Patented multi-chamber structure suppresses noise in specific frequency bands using precise chamber dimensions and damping materials.
• Dual Stage Flow Regulation Mechanism: Innovative dual-stage structure provides finer flow control and reduces fluid pulsation.
• Magnetorheological Damping Technology: Real-time adjustable damping via magnetic field strength effectively suppresses vibrations, a first in automotive AC control valves.
• Special Sealing Materials: Nano-composite materials ensure full sealing performance under extreme temperatures.

Proven Results

• Noise level reduced to 28dB(A) under idling conditions
• Pressure fluctuations controlled within ±0.015MPa
• Flow control accuracy of ±1.8%

These results exceed the customer’s requirements, and the solution has been successfully implemented in the new-generation flagship model. The project demonstrates Qirun Auto Parts’ expertise in high-end, customized AC control valves.

High-End Market Expansion

Qirun has established cooperative relationships with multiple luxury automotive brands. The proportion of customized solutions continues to increase, showcasing the company’s ability to deliver advanced NVH solutions and support global high-end automotive markets.

📩 Contact Qirun Auto Parts today to source customized AC control valves for luxury vehicles and enhance NVH performance in your automotive projects.

🌐 Learn more about Qirun high-end AC control valve solutions for global automotive HVAC applications.