Even though no one can currently predict the exact development of the market in the coming years, it may be generally agreed that vehicles with electrified power trains will at least become increasingly common in the traffic of large cities. The foreseeable growth in the importance of alternative power trains can be attributed to several factors, some of which reinforce each other. In addition to other effects, only a change in the environmental awareness of growing segments of the population, the depletion of fossil fuels and the consequential rise in their prices and the further tightening of emissions standards will be mentioned here. The growing number of hybrid designs being developed by all major car makers will, in the process, function as bridging technology between conventional power train systems and purely electric vehicles. These power trains, which have been extended by additional operating modes, significantly increase the complexity of the application of the control units, especially those in the power train, in comparison to those in vehicles driven with internal combustion engines only. This increased complexity makes it absolutely imperative to employ a model-based optimisation process when creating a design optimised for fuel efficiency and emissions reduction. This article will present an overview of the process used at Volkswagen for this purpose and illustrate it with a practical example. The combination of statistical experimental design methods with simulation and model-based optimisation make it possible to realise significant gains in efficiency during hybrid vehicle development projects. On one hand, the application of these methods makes it possible to systematically register the complex relationships among a large number of influencing factors which determine the behaviour of the operating strategy and the resulting effects on fuel consumption and emissions. On the other hand, the time-lapse effect of simulation in conjunction with the reduction of the experimental effort due to the DoE experimental designs made it possible to significantly reduce the development time compared to conventional methods. In view of the foreseeably growing number of hybrid vehicles that are to come into the market in the near future, the described methods will make an important contribution to the attainment of developmental goals on schedule and cost-effectively.
Minimisation of fuel consumption and emissions through the optimisation of the hybrid operating strategy
2012
20 Seiten, 7 Bilder
Aufsatz (Konferenz)
Datenträger
Englisch
Hybrid operating strategies in the trade-off between fuel consumption and emissions
Springer Verlag | 2019
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