Browse Publications Technical Papers 2004-01-0411
2004-03-08

NV Countermeasure Technology for a Cylinder-On-Demand Engine- Development of Active Booming Noise Control System Applying Adaptive Notch Filter 2004-01-0411

The conventional active noise control technology for engine booming noise1 based on the Filtered-Reference LMS algorithm 2,3 has a conflict in between the ability of tracking a change of engine rpm and simultaneously controlling the low frequency (low rpm) region. As a result, the conventional approach is difficult to apply for booming noise for a low rotation engine, an important region for weight reduction of a vehicle. Because of these reasons, there are few applications of the conventional approach to reduce booming noise.
The purpose of this study is to propose a less complex ANC system based on a Single-frequency Adaptive Notch (SAN) 2,4 algorithm. The system proposed in this paper solves the problem of good control performance in the low rotation or rpm region, assures the stability related to a mass production, and reduces the number of component parts in a manufacturing process. The proposed ANC system includes these technologies and is integrated in an audio system and applied to reduce booming noise in a cabin.
The system developed in this study has been applied in combination with an active control engine mount system. It is applied to a new model vehicle with a V6 engine that provides cylinder on demand. The purpose is to reduce booming noise generated by an engine in three-cylinder operation, resulting in the achievement of excellent fuel economy and NV performance.

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