车辆低频纵振全工况主动控制算法研究

项目名称： 车辆低频纵振全工况主动控制算法研究

项目编号： No.51475043

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 机械、仪表工业

项目作者： 黄英

作者单位： 北京理工大学

项目金额： 80万元

中文摘要： 随着人们对驾驶性、舒适性、安全性要求的不断提高，车辆NVH问题成为近年来研究的热点。车辆低频纵振是传动系统扭振引起的10Hz以下的纵向加速度波动，主要出现在急加速/减速、起步、换挡、制动等驾驶工况，对驾驶性和舒适性有极大的影响，且无法通过常规减振措施消除。本课题采用发动机转矩补偿控制对传动系统施加反激励，实现低频纵振的主动抑制。首先通过多体动力学仿真及整车试验对比研究，揭示各典型驾驶工况下低频纵振产生的机理及参数影响规律，明确基于模型的控制中需要考虑的激励源、动态过程及非线性因素；之后针对不同驾驶工况下传动系统多激励、非线性混杂特征，应用混杂建模理论，在统一的框架下构建全工况低频纵振混杂预测模型；最后基于所建立的混杂预测模型，应用混杂模型预测控制理论，以驾驶性和舒适性为优化目标，构建发动机补偿转矩滚动优化算法，并完成仿真验证。本课题探索了综合解决全工况下低频纵振抑制问题的新途径。

中文关键词： 车辆纵振；耦合振动；振动主动控制；混杂建模；预测控制

英文摘要： To optimize vehicle longitudinal vibration which can be a significant source of objectionable vehicle Noise, Vibration and Harshness (NVH) performance is a key issue in modern automotive research. Low frequency vehicle longitudinal vibration which mainly occurs in driving manoeuvres of rapidly acceleration or deceleration, starting, shifting and braking is the fore and aft oscillations in acceleration which is excited by driveline torsional vibration ,and its frequency is lower than 10Hz. The low frequency longitudinal vibration has a bad effect on the drivability and passengers' comfort, and it cannot be eliminated by the normal vibration reduction measure.Considering all these factors, a new active control strategy for engine torque compensation has been proposed to apply to a counterforce to the driveline so as to realize the active suppression of low frequency vehicle longitudinal vibration. Firstly,through comprative study on multi-body dynamics simulation and complete vehicle test,the low frequency vehicel longitudinal vibration mechanism and parameters influence law under different driving manoeuvres can be revealed. Based on this, these different excitation sources,dynamics process and non-linear characteristics which should be considered in model-based control can be studied. Secondly, for multiple excitaions and non-linear hybrid characteristics of driveline system under different driving manoeuvres, the hybrid modeling theory can be used to build the hybrid predicitve model of low frequence longitudinal vibration in all driving manoeuvres in the unified frame.Finally,based on the established hybrid preditive model, applying the preditive control theory of hybrid model and aiming at the optimal target of drivability and comfort, the moving horizon optimization algorithm for engine torque compensation is studied and verified with simulation.This project explores the new approach for controling low frequency vehicle longitudinal vibration in full driving manoeuvres.

英文关键词： Vehicle Longitudinal Vibration;Coupled Vibrations;Active Vibration Control;Hybrid System Modeling;MPC