The common requirement of fuel consumption efficiency usually contrasts the driveability requirements of most customers. As a consequence, engines are designed in order to cover also operating points that will seldom be necessary. This has a well known price in terms of consumption. It is a well known fact that internal combustion engines (ICE) offer the best fuel economy slightly below the maximum torque in the engine performance map. Necessary driving comfort, required dynamical behavior of the vehicle and customer wishes are a major topic for the design of all power-train components and the compliance of all this points usually drive the vehicle to higher fuel consumption. The use of the integrated starter generator (ISG) allows now to add or subtract a given torque to the engine crankshaft. This can be used to keep dynamic performances of the vehicle unchanged while downsizing the engine range. As shown in the paper, the ISG can also be used to reduce some requirements of the engine for transient performances, thus allowing to improve the specific consumption. In particular, two downsizing approaches have been presented. As shown elsewhere, it is also possible to strongly reduce the cold start emissions. The basic condition for all these improvements, however, is not to use the new components simply as a replacement for the old ones. The energy management has been designed in terms of an optimization task, whose performance was tested in simulation and on a dynamical test bed, whereby the results in both cases are almost identical. With the proposed energy management controller in combination with the available diesel engine and a 15kW ISG it was possible to reduce the fuel consumption for a FTP75 emission test cycle about 5%. Future work will focus on online-updating of the statistical load distribution, start/stop operation of the ISG and on the effects of changing battery parameters and their impact on the controller design.
Downsizing opportunities for drivelines with 42V starter/alternator
Downsizingmöglichkeiten für Fahrzeuge mit 42V-Startergeneratoren
2003
18 Seiten, 12 Bilder, 5 Quellen
Aufsatz (Konferenz)
Englisch
Integrated starter alternator damper
Tema Archiv | 1999
42V Integrated Starter/Alternator Systems
British Library Conference Proceedings | 2003
|ISAD Integrierter Starter-Alternator-Dämpfer
Online Contents | 1997
42V Integrated Starter/Alternator Systems
SAE Technical Papers | 2003
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