Abstract: The powertrain dynamic motion is the key parameter of the vibration and comfortable performance of the vehicle. And the conventional acceleration signal characteristics are often unable to characterize the low-frequency motion feature of the powertrain effectively. Based on the principle of the frequency-domain integration and the method of multi-point motion synthesis, an algorithm for monitoring the dynamic motion of the vehicle powertrain is proposed. The algorithm first performs quadratic integration on the acceleration signal in the frequency domain, and then sets the ultra-low frequency components to be zero. These can eliminate the deviation of the sensor zero drift and temperature drift effectively, and improve the calculation accuracy of the displacement signal. Performing the method of motion synthesis on the multi-point signal, the six-degree-of-freedom motion characteristic of a powertrain rigid body is obtained. The applications of the automobile acceleration condition and the key-on/key-off condition shows that the proposed algorithm can obtain the dynamic motion characteristic of the rigid body of the vehicle powertrain effectively and intuitively.

Key words: Vehicle powertrain; Dynamic motion; Frequency-domain integration; Motion synthesis

摘要： 动力总成的运动姿态直接影响着汽车振动性能和舒适性能，而常规的加速度信号特征往往 无法有效表征出动总的低频运动特征。文章基于频域二次积分原理和多点运动合成方法，提出了 一种汽车动力总成质心运动姿态监测算法。对加速度信号进行频域二次积分，同时对超低频成分 置零处理，从而较好地消除传感器零漂和温漂的误差，提高了位移信号的获取精度；对多测点信 号进行运动合成，获取了动总刚体六自由度运动特征信息。汽车加速窜动工况和静态点熄火工况 的工程应用表明：所提算法能够有效并直观地合成出动力总成质心刚体的运动特征信息。

关键词: 汽车动总；运动姿态；频域积分；运动合成