Globalization and growing new markets, as well as increasing emission and fuel consumption requirements, force the car manufacturers and their suppliers to develop new engine control strategies in shorter time periods...
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Globalization and growing new markets, as well as increasing emission and fuel consumption requirements, force the car manufacturers and their suppliers to develop new engine control strategies in shorter time periods. This can mainly be reached by development tools and an integrated hardware and software environment enabling rapid implementation and testing of advanced engine control algorithms. The structure of a rapid control prototyping (RCP) system is explained, which allows fast measurement signal evaluation, and rapid prototyping of advanced engine control algorithms. A hardware-in-the-loop simulator for diesel engine controldesign is illustrated, simulation results for a 40 tons truck are presented. Providing efficient engine models for the proposed development tools, a dynamic local linear neural network approach is explained and applied for modelling the NO, emission characteristics of a 1.9 1 direct injection diesel engine. Furthermore the application of a RCP system is exemplified by the application of combustion pressure based closed-loop ignition timing control for a SI engine. Experimental results are shown for a 1.0 1 SI engine on a dynamic engine test stand. (C) 2003 Elsevier Ltd. All rights reserved.
A new PC-based hardware-in-the-loop simulation (HILS) platform is developed for designing an automotive engine controlsystem. The HILS equipment consists of a widely used PC and commercial off-the-shelf (COTS) I/O bo...
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A new PC-based hardware-in-the-loop simulation (HILS) platform is developed for designing an automotive engine controlsystem. The HILS equipment consists of a widely used PC and commercial off-the-shelf (COTS) I/O boards instead of a powerful computing system and custom-made I/O boards. These features make the HILS equipment more cost effective and flexible. The HILS uses an automatic code generation extension, REAL-TIME WORKSHOP(R) of the MATLAB((R)) tool-chain, which is one of the standard tools for modelling and off-line simulation in the area of controller design. This helps the controlsystem developers to handle the controlled-object model more easily and to test the controlsystem more comfortably and time effectively. The mean value engine model, which is used in the controldesign phase, is imported in this HILS. The engine model is supplemented with some I/O subsystems and I/O boards to interface actual input and output signals in real time. The I/O subsystems are designed to synchronize the status of the engine model with the controlsystem as well as to convert the raw data of the I/O boards to the appropriate forms for proper interfaces. To prove the feasibilities of the proposed environment, a pilot project for the development of an air-to-fuel ratio controlsystem is carried out. The HILS environment is proved to be an efficient tool to develop various control functions and to validate the software and hardware of the engine controlsystem.
The scenario for control education is changing and we must adapt to the new situation. Information technology opens a whole new world of real opportunitie. computers show a great potential to enhance student achieveme...
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The scenario for control education is changing and we must adapt to the new situation. Information technology opens a whole new world of real opportunitie. computers show a great potential to enhance student achievement, but only if they are used appropriately as part of a coherent education approach. computers do not change in the way books or labs do, they allow us to go deeper and faster. This paper presents the personal experience of the author in the use of interactive tools in order to make students more active and involved in their own control engineering learning process. Some examples, with different degrees of complexity, have been selected in order to show how we can use the control visualization concept in a new family of interactive tools for control education.
This contribution describes a LabVIEW based interactive computeraidedcontrolsystemdesign tool. It offers a set of ready to use solutions of typical controlsystemdesign problems. Instead of a syntax a menu driven...
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This contribution describes a LabVIEW based interactive computeraidedcontrolsystemdesign tool. It offers a set of ready to use solutions of typical controlsystemdesign problems. Instead of a syntax a menu driven user interface with convenient system editors and analysis tools enables the user to interactively attain the design goals. The tool allows the student to efficiently do the controlsystemdesign from plant identification to controller implementation on the same platform.
The adoption of a structured development methodology, based on a design cycle and on formal reference models, is a key issue to manage, possibly in a step-by-step fashion, the design of industrial control and supervis...
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The adoption of a structured development methodology, based on a design cycle and on formal reference models, is a key issue to manage, possibly in a step-by-step fashion, the design of industrial control and supervision systems, as there are in modern robotic applications. In the present work, a development technique is illustrated, which extends some of the most relevant solutions and methods used to effectively deal with the design of complex controlsystems and integrates them into a structured methodology with analysis and simulation facilities. The main discriminating features of the presented framework are: the object-oriented approach, compliance with international standards for control software specification, hybrid dynamic models and automatic code generation. The development and implementation of a robot mission for a six degree-of-freedom manipulator is illustrated to highlight the benefits and advantages of the proposed methodology.
A solution to the Shell standard control problem is presented in this paper, based on genetic algorithms (GAs). The proposed scheme includes two discrete-time PID controllers with integral anti-windup and a multivaria...
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A solution to the Shell standard control problem is presented in this paper, based on genetic algorithms (GAs). The proposed scheme includes two discrete-time PID controllers with integral anti-windup and a multivariable Smith predictor to provide the required process output regulation, while the process input minimisation problem is analytically solved on-line, by estimating the unmeasured disturbances entering the process and solving the associated linear programming problem. This, as well as the presence of constraints in the process manipulated variables, results in a complex, non-linear closed-loop system and hence, the manual tuning of the PID controllers according to some given performance specifications becomes a difficult task. GAs are successfully applied to the automatic tuning of the PID controllers according to the given specifications, using a specially formulated objective function which quantifies the controller performance in terms of time-domain bounds on the closed-loop system responses. Simulation results are presented to demonstrate the effectiveness of the proposed control scheme. (C) 2002 Elsevier Science Ltd. All rights reserved.
In this paper an idea is presented on how to motivate students to learn an exacting subject such as computer-aidedcontrolsystems design (CACSD). The idea is that the exam is a virtual race or competition meaning tha...
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In this paper an idea is presented on how to motivate students to learn an exacting subject such as computer-aidedcontrolsystems design (CACSD). The idea is that the exam is a virtual race or competition meaning that the students are graded according to the success achieved in the competition. The aim of the competition is set by the professor, and the students have to design a controller to achieve the best possible result they can. Four competition subjects, those used in the last four years of CACSD education at the Faculty of Electrical Engineering, University of Ljubljana, are reviewed with emphasis on the fourth one-the surf regatta. The mathematical model of the surf is then presented. In all four cases, the criterion for the competition was the shortest time. The paper concludes with the description of solutions applied by students and the faculty experiences with the course.
The robust control of a general servomechanism problem is applied in the case of electrohydraulic servo actuating primary flight controls. The servocompensator structure is proved to be close to the one designed for s...
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The robust control of a general servomechanism problem is applied in the case of electrohydraulic servo actuating primary flight controls. The servocompensator structure is proved to be close to the one designed for step signals. The stabilizing compensator is ensured by the way of a linear quadratic optimal procedure. An antiwindup compensation is added to deal with the adverse effects caused by control saturation. The proof is made involving the form of a feedback compensation matrix. Numerical simulations are presented to validate the proposed procedure.
Globalization and growing new markets, as well as increasing emission and fuel consumption requirements force the car manufacturers and their suppliers to develop new engine control strategies in shorter time periods....
详细信息
Globalization and growing new markets, as well as increasing emission and fuel consumption requirements force the car manufacturers and their suppliers to develop new engine control strategies in shorter time periods. This can mainly be reached by development tools and an integrated hardware and software environment enabling rapid implementation and testing of advanced engine control algorithms. The structure of a Rapid control Prototyping (RCP) system is explained, which allows fastmeasurement signal evaluation, and rapid prototyping of advanced engine control algorithms. A hardware-in-the-Ioop simulator for Diesel engine controldesign is illustrated, simulation results for a 40 tons truck are presented. Providing efficient engine models for the proposed development tools, a dynamic local linear neural network approach is explained and appliedfor modelling the NO x emission characteristics of a 1.9 liter direct injection Diesel engine. Furthermore the application of a RCP system is exemplified by the application of combustion pressure based closed-loop ignition timing control for a SI engine. Experimental results are shown for a 1.0 liter SI engine on a dynamic engine test stand.
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