关键词: 传动系, 参数估计, 转矩波动, 扭振试验, 阶次分析

Abstract: In order to study the variation law of engine excitation torque fluctuation coefficient under different driving conditions of the vehicle, and analyze the sensitivity of the key parameters for the transmission system to the torsional vibration. A simplified concentrating mass model and a longitudinal dynamics model of the vehicle are established. The order analysis of the measured torsional vibration data is then performed to determine the main torque excitation order of the driveline. Furthermore, two intelligent algorithms are introduced to estimate the excitation torque fluctuation coefficient under each gear with the objection is to minimize the acceleration time squared error of each WOT condition, and the convergence curves of the two intelligent parameter estimation methods are compared. Finally, the time domain average speed fluctuation is taken as the evaluation index, and the adjustment effect of each main parameter on the torsional vibration is analyzed. The results show that within the test speed, the engine excitation torque fluctuation coefficient decreases as the speed and load increase, indicting that the engine runs more smoothly in heavy load. The conclusions is drawn as well that proper reduction of clutch stiffness, increasing of clutch damping, flywheel inertia, half-shaft stiffness and damping are beneficial to reduce the torsional vibration of the driveline system thus improving the comfort of the vehicle.

Key words: driveline')">font-size: 10.5pt;">driveline, parameter estimationfont-size: 10.5pt;">parameter estimation')">font-size: 10.5pt;">, torque fluctuation, torsional vibration test；ofont-size: 10.5pt;">；order analysis ')">font-size: 10.5pt;">rder analysis