关键词: 汽车动总；运动姿态；频域积分；运动合成

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