Refine
Keywords
- Abgasrückführung (2)
- Software Engineering (2)
- Abgase (1)
- Abgasemmission (1)
- Abgasskandal (1)
- Abschaltfunktion (1)
- Batteries (1)
- Converter machine interactions (1)
- Direct torque and flux control (1)
- Electrical machine (1)
Year of publication
- 2017 (7) (remove)
Document Type
- Conference Proceeding (6)
- Book (1)
Has Fulltext
- no (7)
This paper will present different modulation schemes for optimizing the efficiency of low-voltage traction drives.
The converter of the vehicle automatically has to select the most suitable modulation or control scheme depending
on the present operating point in order to maximize the efficiency of the complete drive train. Furthermore, the
functional principles and algorithms of the individual modulation schemes will be presented, as well as the transition
between those schemes. Finally, the performance of the different schemes will be proved by dynamic and
stationary tests through fully automatized measurement analysis.
This paper reveals that the standard test procedures for the qualification and verification of traction battery systems are not sufficient in certain cases. In fact, realistic and application-oriented tests on the interaction among the complex battery subsystems are inevitable. To achieve these objectives, a high-performance test bench with the unique selling features of a high voltage/- and current range, extremely low ripple currents, and high dynamics is presented. For the operation of the applied multiphase current-sharing inverter for charging/discharging the device under test (DUT), special control algorithms, especially a current balancing control method, is introduced.
Manipulation von Abgaswerten
(2017)
Dieses kleine Buch stellt Hintergründe zum Abgasskandal dar, z. B. welche Schadstoffe kritisch sind, wie Motorsteuergeräte, Abgasrückführung und Abgasnachbehandlung funktionieren, wie Manipulationen auf dem Prüfstand möglich sind, mit welchen Fahrzyklen getestet wird und in welchem rechtlichen und politischen Umfeld dies lange Zeit unbemerkt mit unterschiedlichen Konsequenzen in der EU und den USA geschehen konnte. Es werden Maßnahmen vorgestellt, mit denen Fahrzeuge auch real gesetzliche Grenzwerte einhalten können und wie Manipulationen zukünftig rechtlich und politisch verhindert werden können. Dem Leser werden durch Literaturhinweise zusätzliche Details erschlossen.
Model Based EGR Control
(2017)
Almost stationary control of the correct EGR rate (Exhaust Gas Recirculation) is state of the art. More aggressive emission tests such as WLTP and RDE require a dynamic control of the EGR rate, otherwise a too low EGR rate results in increased NOx emissions, a too high EGR rate in particulate emissions. The difficulty in any EGR control is the missing plant knowledge; the EGR rate is controlled although the present EGR rate is not exactly known. EGR flow sensors are available, but due to additional costs they have not found a broad acceptance. A different approach for high pressure EGR investigated in this paper is a control using a second lambda sensor between EGR and inlet valves. This approach improves the dynamic response, but it might come with costs similar to an EGR flow sensor. Alternatively a model based approach can be used which shows high potential.
To handle heterogeneity within students, to foster needed generic
competencies, to motivate them, and to increase their employability, a didactical method to teach and learn programming in non-major degree programs shall be found. Therefore, this paper covers strategies and the theoretical underpinning concerning these four challenges and gives solutions how to cope with them. Finally, Pair Programming is presented as a method that addresses the issues introduced here.
In Software Engineering education didactical foundation is still at its beginnings. In recent years, this topic is put into stronger focus, as Software Engineering becomes more and more important in our everyday life. However, it is hard to teach and learn, because of diverse factors, e.g. the immateriality of the product. Therefore it is significant to improve the learning process on the one hand and to minimise obstacles to learning on the other hand. Other disciplines – with a long historical background in their ”Fachdidaktik” (e.g., biology or chemistry) – have already dealt with one sort of learning barriers; so-called misconceptions. The hurdle that misconceptions create can and will be explained by the constructivist learning theory. This paper covers a research approach to identify, analyse, filter and Cluster misconceptions in Software Engineering.