NVH Performance of Accessories in Range-Extended Electric Vehicle

In course of the electrification of vehicle's powertrain, one of the vital problems we've been faced with is the limitation of the vehicle's driving range due to the capacity of currently available batteries. Therefore, range-extended electric vehicle (ReEV) concept has become one of the most promising transitory technologies to compensate this defect. Electric vehicle is supposed to be quiet and comfortable for the customers. However, some annoying sound derived from powertrain and accessories must be reduced or eliminated to meet this requirement. Accessory NVH has an important contribution to ReEV's NVH performance. If it is not well handled, poor vibration and noise may appear.

This paper focuses on accessories' NVH performance in ReEV including the NVH problems from steering pump, vacuum pump and AC compressor. This work starts with subjective assessment and then continues with objective measurements from which the NVH performance of accessories in ReEV is analyzed and the interference between AC compressor and auxiliary power unit is observed. After that, some analysis on the experimental results is presented and the possible improving methods are finally recommended.