关键词: 高压线束支架；混合动力车；混联一挡模态；四阶轰鸣

Abstract: The booming noise of a hybrid vehicle at little accelerator pedal hybrid electric vehicle direct drive modal are studied. The noise occurs at the engine speed of 2 200 r/min. Through noise and vibration measurements, and by using the signal processing methods such as order analysis, it is confirmed that the booming noise comes from the engine the fourth order, which are transferred and amplified from high voltage harness brackets. Through test, it is found that the mode of high-voltage harness support is 150 Hz, coupled with the fourth order noise at hybird electric vehicle direct drive modal. Based on test results, the simulation model is established. According to the hybrid vehicle control unit acceleration shift point and the modal frequency avoidance strategy, the modal target of the bracket is proposed to be 180 Hz, and optimize the structure. And than the mode of the high voltage harness support system are optimized. The real vehicle verified that the fourth order booming noise is reduced by 3 dB(A) after the modes are improved.

Key words: High voltage harness brackets; Hybrid vehicle; Hybrid electric vehicle direct drive modal; Fourth order booming noise