In view of the finiteness of fossil energy sources, the CO2 discussion and political constraints regarding emission limitations of motor vehicles, the OEMs have focused on the development of alternative drive concepts for several years. The parallel hybrid drive, with different versions already being on the market, is one of these concepts. The state of the art for evaluating and comparing energy and fuel consumption is determined in statutory driving cycles, e.g. the New European Driving Cycle (NEDC). These values, however, hardly comply with the values determined in practice due to the different performance requirements in driving cycle and customer use. It is therefore necessary to focus on the requirements determined in representative customer use instead of statutory driving cycles to increase the drivetrain efficiency and achieve maximum customer benefit. In this regard, a holistic approach will be presented in this article which takes the driver behaviour in real traffic into account. It is based on the so-called DRV parameter space which is defined by three variables: driver, vehicle and road. The driver is differentiated in terms of driving style. 'Vehicle' takes the system behaviour of the hybrid drive train into account and the driving environment describes where the vehicle is driven (road, traffic control etc.). The following aspects are most important: use of the DRV method to determine the representative demands on the drivetrain components of parallel hybrid drives and the appropriate representation of the results of extensive simulations in NEDC and customer use. In addition to potential fuel savings, loads on the drivetrain components, e.g. transmission and start/stop clutch, in NEDC and customer use are compared. A method of analysing customer behaviour systematically is presented in the following. The so-called DRV method (which will be explained in more detail in chapter 2) takes the interaction of driver, vehicle and road into account. It was already used successfully for conventional drives and chassis components. The load requirements are necessary for the development of a suitable prototype, so a time and cost efficient determination of the requirements is only possible by means of appropriate simulation software. In this context, the use of the DRV method allows an extensive analysis of the customer behaviour. The results are used for the driver and road models to represent the customer behaviour. In addition to the drivetrain model, the driver and road models are part of the simulation model presented in chapter 3. By using this simulation model, e.g. fuel consumption and component loads cannot only be determined in the statutory driving cycles, but also in customer use. The results of the simulation will be presented in chapter 4 and the representative demands on the individual drivetrain components, which are necessary for the development process, derived.
Demand optimisation for parallel hybrid drives
Optimierung der Betriebsanforderungen an Parallelhybridantriebe
2010
18 Seiten, 10 Bilder, 4 Tabellen, 11 Quellen
Conference paper
English
Demand optimisation for parallel hybrid drives
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