Input-to-State Stabilization of Nonlinear Impulsive Delayed Systems: An Observer-Based Control Approach

This paper addresses the problems of input-to-state stabilization and integral input-to-state stabilization for a class of nonlinear impulsive delayed systems subject to exogenous dis-turbances.Since the information of plant’s states,time delays,and exogenous disturbances is often hard to be obtained,the key design challenge,which we resolve,is the construction of a state observer-based controller.For this purpose,we firstly propose a corresponding observer which is independent of time delays and exogenous disturbances to reconstruct(or estimate)the plant’s states.And then based on the observations,we establish an observer-based control design for the plant to achieve the input-to-state stability(ISS)and integral-ISS(iISS)properties.With the help of the comparison principle and average impulse interval approach,some sufficient conditions are presented,and moreover,two different linear matrix inequalities(LMIs)based criteria are proposed to design the gain matrices.Finally,two numerical examples and their simulations are given to show the effectiveness of our theoretical results.

A Nonlinear Observer Approach of SOC Estimation Based on Hysteresis Model for Lithium-ion Battery

In this paper, a state of charge U+0028 SOC U+0029 estimation approach for lithium-ion battery based on equivalent circuit model and the input-to-state stability U+0028 ISS U+0029 theory has been proposed. According to the electrochemical performance of lithiumion battery, the equivalent circuit model with two RC networks is established, which includes hysteresis characteristic in inner electrochemical response process. The nonlinear relation between open circuit voltage U+0028 OCV U+0029 and SOC is obtained from a rapid test. Exponential fitting method is used to identify the parameters of the model. A novel state observer based on ISS theory is designed for lithium-ion battery SOC estimation. The designed observer is tested on AMESim and Simulink co-simulation. The simulation results show that the proposed method has a high SOC estimation accuracy with an error of about 2 percent. © 2017 Chinese Association of Automation.

基于观测器的输出反馈电子节气门控制器设计

针对电子节气门系统的状态变量不完全可测量,设计了一个基于观测器的输出反馈电子节气门控制系统.该系统由一个估计不可测量状态的降阶观测器和一个非线性状态反馈控制器组成.同时在控制器中引入了跟踪误差的积分项以抑制跟踪静差.将建模误差和观测器误差等不确定性看作外部扰动,在输入到状态稳定性(Input to state stability,ISS)理论框架下分析了跟踪误差系统的鲁棒性,并据此给出了选择控制器参数的指导性原则.仿真及实验结果表明,基于观测器的输出反馈控制器能够很好地实现电子节气门的跟踪控制.

基于尿素选择催化还原系统的氨覆盖率非线性降维观测器设计

针对尿素选择性催化还原(urea-SCR)系统氨覆盖率状态变量不可测量问题,在输入-状态稳定性理论(ISS)框架下设计了一款降维观测器。为保证观测器误差动态的鲁棒性,将温度、废气流量传感器测量等模型误差看作外部扰动,在ISS理论框架下进行了分析。为了提高观测器对噪声的鲁棒性并减少估计的静态误差,本文通过线性矩阵不等式(LMI)和凸优化得到了尽可能小的观测器增益。在enDYNA精确发动机模型的FTP75测试循环下进行了瞬态仿真,与普通的机理观测器对比表明,本文提出的降维观测器对外界干扰和参数不确定性具有更强的鲁棒性。

A Nonlinear Small-Gain Theorem for Large-Scale Infinite-Dimensional Systems

This paper develops a large-scale small-gain result for dynamic networks composed of infinite-dimensional subsystems. It is assumed that the subsystems are input-to-output stable（IOS）and unboundedness observable（UO）, and the large-scale infinite-dimensional system can be proved to be IOS and UO if the proposed small-gain condition is satisfied.