检索结果-内蒙古大学图书馆

作者： Sequenz, Heiko Mrosek, Matthias Zydek, Simon Isermann, Rolf Institute of Automatic Control Laboratory of Control Engineering and Process Automation Technical University Darmstadt Germany

ISBN: (纸本)9783902661937

Due to more and more stringent emission regulations the optimisation of transient engine operation becomes necessary for future Diesel engine developments. Exemplary for the transient operation a step in acceleration pedal is investigated and optimised with respect to the engine emissions. This gives insights about the emission formation at transient driving and a benchmark for the design of open and closed-loop controls. A model structure to simulate the engine emissions and the engine torque is presented. It consists of a dynamical mean value air path model and a stationary combustion model. Thus the relevant outputs NOx, soot and torque are simulated with respect to the engine actuators. For optimisation the calibrated emission values for steady state are regarded. The actuators of the air path and the crank angle of the main injection are optimised such that the emissions follow a desired trajectory. The results are compared to a non-optimised step in acceleration and to a nonlinear closed loop control of the air path. © 2011 IFAC.

关键词： Diesel engines

来源：评论

学校读者我要写书评

暂无评论

Fault-tolerant control of an electro-hydraulic servo axes with a duplex-valve-system

Fault-tolerant control of an electro-hydraulic servo axes wi...

引用

作者： Beck, Mark Schwung, Andreas Muenchhof, Marco Isermann, Rolf TU Darmstadt Institute of Automatic Control Laboratory for Control Systems and Process Automation 64283 Darmstadt Germany TU Darmstadt Institute of Automatic Control Laboratory for Control Theory and Robotics 64283 Darmstadt Germany

ISBN: (纸本)9783902661937

This paper presents fault detection, fault diagnosis, the fault-tolerant control of an electro-hydraulic servo axes with a duplex-valve-system. The fault detection is based on parity equations and is load independent. The semi-physical models allow the detection of even small faults in the hydraulic system. The fault diagnosis used at the testbed is based on fuzzy-logic. In order to tolerate a faulty hydraulic proportional valve, a duplex-valve-system built up with standard proportional valves is applied. The fault management module allows the supervision of the hydraulic servo axes and decides on the reconfiguration of the control-loop. An Internal Model control (IMC)-tracking control structure for bumpless transfer between controllers is presented. Experimental results show the industrial applicability of the approach. © 2011 IFAC.

关键词： Fault detection

来源：评论

学校读者我要写书评

暂无评论

Model following with output feedback for Fault Tolerant control

Model following with output feedback for Fault Tolerant Cont...

引用

15th International Conference on System Theory, control and Computing, ICSTCC 2011

作者： Cimpoeşu, Elena M. Ciubotaru, Bogdan D. Popescu, Dumitru APCC Automatic Process Control and Computers Laboratory Polytechnic University of Bucharest 060042 Bucharest Romania

ISBN: (纸本)9781457711732

The increasing control demands for safety-critical applications have led to the need for a new type of control system, capable of guaranteeing that the desired system performances are met, as well as ensuring the system operational safety, both under normal operating conditions and in the presence of system faults. Such systems are known in the literature as Fault Tolerant control Systems (FTCS) regarding the procedure of redesigning a controller after a fault occurs so that the control objectives from the nominal regime are still achieved - this is referred to as fault accommodation. This paper investigates and applies two controller reconfiguration strategies based on the principles of Model Following (MF) control, namely the Implicit MF (IMF) and the Explicit MF (EMF) approaches, while developing the new control configurations where output feedback is used. The advantages and disadvantages of each technique are briefly discussed and an application example is provided showing how the I/E-MF can be used in aircraft Fault Tolerant control (FTC). © 2011 Faculty of Auto control.

关键词： controllers

来源：评论

学校读者我要写书评

暂无评论

Model Based Optimisation of a Step in Acceleration for a CR-Diesel Engine

引用

IFAC Proceedings Volumes 2011年第1期44卷 13016-13021页

作者： Heiko Sequenz Matthias Mrosek Simon Zydek Rolf Isermann Institute of Automatic Control Laboratory of Control Engineering and Process Automation Technical University Darmstadt Germany

Abstract Due to more and more stringent emission regulations the optimisation of transient engine operation becomes necessary for future Diesel engine developments. Exemplary for the transient operation a step in acceleration pedal is investigated and optimised with respect to the engine emissions. This gives insights about the emission formation at transient driving and a benchmark for the design of open and closed-loop controls. A model structure to simulate the engine emissions and the engine torque is presented. It consists of a dynamical mean value air path model and a stationary combustion model. Thus the relevant outputs NO x , soot and torque are simulated with respect to the engine actuators. For optimisation the calibrated emission values for steady state are regarded. The actuators of the air path and the crank angle of the main injection are optimised such that the emissions follow a desired trajectory. The results are compared to a non-optimised step in acceleration and to a nonlinear closed loop control of the air path.

关键词： Emission Models Air Path Models Optimisation

来源：评论

学校读者我要写书评

暂无评论

Emission Model Structures for an Implementation on Engine control Units

引用

IFAC Proceedings Volumes 2011年第1期44卷 11851-11856页

作者： Heiko Sequenz Rolf Isermann Institute of Automatic Control Laboratory of Control Engineering and Process Automation Technical University Darmstadt Germany

Abstract The number of model-based approaches in modern engine control units (ECUs) increases permanently with the increase of engine complexity. Therefore the efficient storage and the fast computation of these models is a challenging task. Due to their fast computation properties most ECUs utilize 2-dimensional grid map structures. Higher dimensional relations need then to be mapped with nested structures of several 2-dimensional grid maps. The determination of suited structures is a time-consuming task and the number of utilized 2-dimensional grid maps may be large for higher dimensional relations. Therefore in the following a grid map structure, a LOLIMOT structure, a Kernel method and an adaptive polynomial approach are compared with respect to model accuracy, computation time and required memory. Conclusions about the implementation on state of the art ECUs are given. As model output the NO x emissions of a DTH Z19 Opel CR-Diesel engine with VGT-turbocharger and exhaust gas recirculation are regarded. Model structures are presented for a global model approach comprising the engine operation point as input, and for a global-local approach predicting the output by weighting local models.

关键词： Emission Models ECU Model Computing Time Model Memory Demand

来源：评论

学校读者我要写书评

暂无评论

Fault-tolerant control of an electro-hydraulic servo axes with a duplex-valve-system *

引用

IFAC Proceedings Volumes 2011年第1期44卷 9425-9433页

作者： Beck Mark Schwung Andreas Muenchhof Marco Isermann Rolf TU Darmstadt Institute of Automatic Control Laboratory for Control Systems and Process automation 64283 Darmstadt Germany TU Darmstadt Institute of Automatic Control Laboratory for Control Theory and Robotics 64283 Darmstadt Germany

Abstract This paper presents fault detection, fault diagnosis, the fault-tolerant control of an electro-hydraulic servo axes with a duplex-valve-system. The fault detection is based on parity equations and is load independent. The semi-physical models allow the detection of even small faults in the hydraulic system. The fault diagnosis used at the testbed is based on fuzzy-logic. In order to tolerate a faulty hydraulic proportional valve, a duplex-valve-system built up with standard proportional valves is applied. The fault management module allows the supervision of the hydraulic servo axes and decides on the reconfiguration of the control-loop. An Internal Model control (IMC)-tracking control structure for bumpless transfer between controllers is presented. Experimental results show the industrial applicability of the approach.

关键词： Fault Detection Fault Diagnosis Fault Tolerance Electro-hydraulic Servo Axes Duplex-valve-system Active Fault-Tolerant control Reconfiguration Bumpless-Transfer

来源：评论

学校读者我要写书评

暂无评论

Model following with output feedback for Fault Tolerant control

Model following with output feedback for Fault Tolerant Cont...

引用

International Conference on System Theory, control, and Computing (ICSTCC)

作者： Elena M. Cimpoeşu Bogdan D. Ciubotaru Dumitru Popescu APCC Automatic Process Control and Computers Laboratory Polytechnic University of Bucharest Bucharest Romania

关键词： Stability criteria Output feedback Aircraft Computational modeling Atmospheric modeling

来源：评论

学校读者我要写书评

暂无评论

An on-board pan-tilt controller for ground target tracking systems

An on-board pan-tilt controller for ground target tracking s...

引用

IEEE Conference on control Technology and Applications (CCTA)

作者： Zhekui Xin Yongchun Fang Bin Xian Beijing AeroSpace Automatic Control Institute China Institute of Robotics and Information Automatic System Nankai University Tianjin China Tianjin Key Laboratory of Process Measurement and Control School of Electrical Engineering and Automation Tianjin University Tianjin China

For a ground target tracking system using an unmanned helicopter, an on-board pan-tilt controller is proposed to adjust the attitude of the camera, so that to keep the target staying at the center of the image plane when the target is in sight. When the target is temporarily out of view due to various reasons, the designed controller will make the camera quickly re-capture the target by estimating its state and then regulating the orientation of the camera correspondingly. Specifically, a novel state transformation is firstly introduced to make the error system independent of the target image. Subsequently, a nonlinear pan-tilt controller is designed for the transformed error system. Lyapunov techniques are then employed to prove that the target tracking error in the image plane is driven to zero exponentially fast. To facilitate the implementation of the constructed controller, a visual estimator is also utilized to obtain the state information of the target even if it is occasionally out of the view of the camera by introducing an effective nonlinear filter. Simulation results are provided to validate the performance of the presented control system.

关键词： Target tracking Cameras Helicopters Jacobian matrices Visualization Robot vision systems

来源：评论

学校读者我要写书评

暂无评论

Identification of the nonlinear, multivariable behavior of mechatronic combustion engines

Identification of the nonlinear, multivariable behavior of m...

引用

5th IFAC Symposium on Mechatronic Systems, MECHATRONICS 2010

作者： Isermann, R. Schreiber, A. Institute of Automatic Control Laboratory of Control Engineering and Process Automation TU Darmstadt Germany

ISBN: (纸本)9783902661760

The identification of the nonlinear dynamic behavior of combustion engines on test benches is described. A method, that is based on the combination of statistical stationary engine measurement (Design of Experiments - DoE) and dynamic identification techniques for nonlinear multi-input systems is shown. The dynamics are excited by several amplitude-modulated pseudorandom-binary- signals (APRBS), which act on the engine simultaneously, in order to allow a short measurement time period. To show the applicability of the described identification and modelling methods several models for a common-rail diesel engine with exhaust gas recirculation and variable geometry turbocharger (VGT) are shown, with five input variables and the outputs nitrogen-oxide emissions, opacity, air-fuel ratio (Lambda) and exhaust gas temperature. © 2010 IFAC.

关键词： Diesel engines

来源：评论

学校读者我要写书评

暂无评论

Stationary global-local emission models of a CR-diesel engine with adaptive regressor selection for measurements of airpath and combustion

Stationary global-local emission models of a CR-diesel engin...

引用

作者： Sequenz, Heiko Mrosek, Matthias Isermann, Rolf Institute of Automatic Control Laboratory of Control Engineering and Process Automation Technical University Darmstadt Germany

ISBN: (纸本)9783902661722

A model structure for stationary emission models is presented. The emissions NOx, soot and opacity are separately modeled. Model inputs are the air mass flow rate, charge air pressure, intake temperature, the location of mass fraction burned 50% and the engine operation point. Local polynomials are trained for each operation point, defined by engine speed and injection quantity. To increase accuracy a selection algorithm of the significant regressors is presented. The local models are composed by means of weighting functions, depending on the engine operation points, to global emission models. For a rasterized operation range, the weighting can be interpreted as a linear interpolation of local models. This enables an easy implementation to common electronic control units (ECUs). Measurements from a CR-Diesel engine show the quality of the models. © 2010 IFAC.

关键词： Diesel engines

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：