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汽车电子技术:硬件、软件、系统集成和项目管理
(2014)
Comparison of Control Strategies by the Example of the Cooling Fan Control of a Mobile Machine
(2014)
In order to compare different control strategies the cooling system of a mobile machine has been chosen. The example control problem was to run the cooling system for m control variables and with n≤m correction variables in a way to minimize power in order to save energy and to reduce fan noise while maintaining sufficient cooling. The plant is nonlinear. Three different kinds of controllers have been investigated in several variations, i.e. fuzzy control, PI(D) and model predictive control (MPC). 14 different criteria have been used for evaluation. In many respects a linear controller with fuzzy prediction proved best, in particular the prediction model can handle nonlinear properties of the plant.
In allen Projektphasen von der Spezifikation bis zum Test hilft die Verfügbarkeit einer simulierten Steuergeräteumgebung. Diese kann modellbasiert, softwarebasiert oder eine Hardwareumgebung sein. Bei der Hardware gibt es einfache Signalgeneratoren und Ersatzlasten als billigste Lösung. Die aufwändigste Lösung ist ein digitaler HiL-Simulator (Hardware in the Loop). Der Beitrag zeigt eine Lösung, die preislich und in der Benutzerfreundlichkeit einen Kompromiss zwischen diesen Extremen darstellt sowie aufgrund ihrer Modularität leicht anpassbar ist.
In this paper, we present two nondestructive characterization methods for the detection of voids in rear local contacts of passivated emitter and rear-type solar cells, namely scanning acoustic microscopy and computer tomography. We compare both methods and include a comparison with electroluminescence measurements. It is shown in this paper that voids can easily be detected with both measurement types without any sample preparation. We found a good match of scanning acoustic microscopy (SAM) and computer tomography (CT), which is presented for this purpose for the first time. The investigation was carried out for different aluminum pastes.
Software Engineering is a very complex theme including abstract processes. Thus its university education is even more challenging; in particular in the course of study in mechatronics, in which various subjects are integrated and combined. Due to our experience the students are low motivated concerning the subject "Software Engineering", because of the mixture of technical and interdisciplinary competencies, therefore the subject matter is difficult to teach.
In this paper, we share some experiences, as we have tried to activate students and therefore attempt to deepen their understanding of Software Engineering and its processes. As a central tool of the seminar phase, which is used to combine active and passive learning styles, a Wiki embedded in our learning management system Moodle was introduced.