Lookup table is widely used in automotive industry for the design of engine control units(ECU).Together with a proportional-integral controller,a feed-forward and feedback control scheme is often adopted for automotiv...Lookup table is widely used in automotive industry for the design of engine control units(ECU).Together with a proportional-integral controller,a feed-forward and feedback control scheme is often adopted for automotive engine management system(EMS).Usually,an ECU has a structure of multi-input and single-output(MISO).Therefore,if there are multiple objectives proposed in EMS,there would be corresponding numbers of ECUs that need to be designed.In this situation,huge efforts and time were spent on calibration.In this work,a multi-input and multi-out(MIMO) approach based on model predictive control(MPC) was presented for the automatic cruise system of automotive engine.The results show that the tracking of engine speed command and the regulation of air/fuel ratio(AFR) can be achieved simultaneously under the new scheme.The mean absolute error(MAE) for engine speed control is 0.037,and the MAE for air fuel ratio is 0.069.展开更多
提出一种基于盲信号分离的方法对MIMO信号进行调制识别.该方法对接收信号的相关矩阵作奇异值分解,用于估算发射天线数目,并对信号进行白化.采用特征值矩阵的联合近似对角化(joint approximate diagonalisation of eigen-matrices,JADE)...提出一种基于盲信号分离的方法对MIMO信号进行调制识别.该方法对接收信号的相关矩阵作奇异值分解,用于估算发射天线数目,并对信号进行白化.采用特征值矩阵的联合近似对角化(joint approximate diagonalisation of eigen-matrices,JADE)算法对接收信号进行分离,恢复发送端信号.通过分析信号的频谱特征,提出4个新的特征参数,并结合四阶累积量实现对MIMO体制下6种信号调制方式的识别.识别过程中无需估计载波频率和符号率等参数,具有较强的实用性.仿真结果表明文中提出的方法具有良好的性能.展开更多
为解决基于协作多输入多输出(Multi-input multi-output,MIMO)的同构无线传感器网络(Wireless sensor net-works,WSN)能量节省与能耗均衡问题,建立了多跳分布式WSN系统模型.对协作MIMO通信中的簇间长传输距离与簇内短传输距离进行了分析...为解决基于协作多输入多输出(Multi-input multi-output,MIMO)的同构无线传感器网络(Wireless sensor net-works,WSN)能量节省与能耗均衡问题,建立了多跳分布式WSN系统模型.对协作MIMO通信中的簇间长传输距离与簇内短传输距离进行了分析,找到与传统单输入单输出(Single-input single-output,SISO)传输相比更节省能量的距离门限.根据分析提出了一种新的基于剩余能量与距离门限的动态分簇(Dynamic clustering based on remaining energy and distance thres holds,DCREDT)选择算法,在节省能量的前提下,使剩余能量较大的节点优先成为簇首,实现了簇首与其他节点之间的能耗均衡.最后分析了采用DCREDT选择算法进行多跳传输的总能耗,并仿真验证了该算法的合理性与有效性.展开更多
基金Project supported by the Centre for Smart Grid and Information Convergence(CeSGIC)at Xi’an Jiaotong-Liverpool University,China
文摘Lookup table is widely used in automotive industry for the design of engine control units(ECU).Together with a proportional-integral controller,a feed-forward and feedback control scheme is often adopted for automotive engine management system(EMS).Usually,an ECU has a structure of multi-input and single-output(MISO).Therefore,if there are multiple objectives proposed in EMS,there would be corresponding numbers of ECUs that need to be designed.In this situation,huge efforts and time were spent on calibration.In this work,a multi-input and multi-out(MIMO) approach based on model predictive control(MPC) was presented for the automatic cruise system of automotive engine.The results show that the tracking of engine speed command and the regulation of air/fuel ratio(AFR) can be achieved simultaneously under the new scheme.The mean absolute error(MAE) for engine speed control is 0.037,and the MAE for air fuel ratio is 0.069.
文摘提出一种基于盲信号分离的方法对MIMO信号进行调制识别.该方法对接收信号的相关矩阵作奇异值分解,用于估算发射天线数目,并对信号进行白化.采用特征值矩阵的联合近似对角化(joint approximate diagonalisation of eigen-matrices,JADE)算法对接收信号进行分离,恢复发送端信号.通过分析信号的频谱特征,提出4个新的特征参数,并结合四阶累积量实现对MIMO体制下6种信号调制方式的识别.识别过程中无需估计载波频率和符号率等参数,具有较强的实用性.仿真结果表明文中提出的方法具有良好的性能.
文摘为解决基于协作多输入多输出(Multi-input multi-output,MIMO)的同构无线传感器网络(Wireless sensor net-works,WSN)能量节省与能耗均衡问题,建立了多跳分布式WSN系统模型.对协作MIMO通信中的簇间长传输距离与簇内短传输距离进行了分析,找到与传统单输入单输出(Single-input single-output,SISO)传输相比更节省能量的距离门限.根据分析提出了一种新的基于剩余能量与距离门限的动态分簇(Dynamic clustering based on remaining energy and distance thres holds,DCREDT)选择算法,在节省能量的前提下,使剩余能量较大的节点优先成为簇首,实现了簇首与其他节点之间的能耗均衡.最后分析了采用DCREDT选择算法进行多跳传输的总能耗,并仿真验证了该算法的合理性与有效性.
