Abstract
Energy savings in the traffic sector are of considerable importance for economic and environmental considerations. Recuperation of mechanical energy in commercial vehicles can contribute to this goal. One promising technology rests on hydraulic systems, in particular for trucks which use such system also for other purposes such as lifting cargo or operating a crane. In this work the potential for energy savings is analyzed for commercial vehicles with tipper bodies, as these already have a hydraulic onboard system. The recuperation system is modeled based on endoreversible thermodynamics, thus providing a framework in which realistic driving data can be incorporated. We further used dissipative engine setups for modeling both the hydraulic and combustion engine of the hybrid drive train in order to include realistic efficiency maps. As a result, reduction in fuel consumption of up to 26% as compared to a simple baseline recuperation strategy can be achieved with an optimized recuperation control.
Highlights
For achieving the global goal of reduced fossil fuel consumption and CO2 emissions the automotive sector plays an important role
The starting point of this work is a research project that focuses on hydraulic recuperation systems for medium and heavy commercial vehicles with tipper bodies
We introduce a model that is build using endoreversible thermodynamics—an approach based on dividing the system in question into reversible acting subsystems and incorporating reversible or irreversible interactions between them [11]
Summary
For achieving the global goal of reduced fossil fuel consumption and CO2 emissions the automotive sector plays an important role. Control or trajectory optimizations have been carried out, too, e.g., for piston movements of Otto [32,33], Diesel [34,35], Miller [36] and Brayton [37,38] and Stirling [39] cycles as well as light-driven engines [40,41,42] These investigations all show, that it is important to put the focus on dynamical features [43] in order to reach the desired efficiency improvements. The endoreversible modeling includes the internal combustion engine and the transmission to consider power sharing and resulting energy savings, and the efficiency of the engine and the resultant reduction of fuel consumption Using this model and realistic driving data, an optimization of the control strategy will be carried out, and its potential to reduce fuel consumption will be shown
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