In the FVV project 'Optimized Iayout of internal combustion engines for hybrid powertrains, an optimization approach using a combination of Design of experiments, drive cycle simulations and numerical optimization of hybrid powertrains was developed. In the presented project, this approach was extended to real-world driving conditions. Since the selected real-world driving cycles consist of higher accelerations and speeds, the influence of fuel enrichment as a component protection measure was also focussed in the parameterization of the combustion engine. The model was enhanced for investigating the engine and transmission warm-up, catalyst heating and transmission efficiency. In addition to a parallel hybrid powertrain, a mixed hybrid and a series hybrid powertrain were also considered. All the three powertrains were investigated also as Plug-In hybrid variants, with minimum combined CO2-emissions derived from the fuel and electrical energy consumption as the optimization criterion. For all the vehicle classes different target values for acceleration, elasticity, maximum vehicle speed and gradeability were defined. In general, the following conclusions were obtained: The influence of the engine concept decreases with an increasing degree of electrification. The potential for reducing fuel consumption and thus CO2-emissions by downsizing through turbocharging decreases in the driving cycles with higher speeds and accelerations. The influence of fuel enrichment an CO2-emissions in the investigated driving cycles is low, because of the elimination of engine operating points at high speeds and loads due to the long gear ratios of the optimal configuration. Two different optimizations for Plug-In hybrid powertrains were performed in this project. The first variant has an electric driving range of etwa 27 km in Artetuis URU cycle and the second variant of etwa 51 km in Artemis URM cycle. The first variant with the shorter electric driving range shows more advantages in most of the driving situations except motorway driving due to lower vehicle weight. The investigations in this project have shown that hybridization of different powertrains under real-world driving conditions has a major CO2 emissions reduction potential and externally rechargeable systems offer additional advantages, especially in urban driving conditions.
Optimized layout of gasoline engines for hybrid powertrains under real world driving conditions
2011
37 Seiten, 35 Bilder, 5 Tabellen, 4 Quellen
Conference paper
English
Optimized layout of gasoline engines for hybrid powertrains under real world driving conditions
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