Abstract\nPurpose This paper outlines a complex simulation model for\nparallel-hybrid diesel railcarswith hydrodynamic power transmission.\nIt contributes to the discussion concerning whether a\nhydrostatic recuperation system can be an alternative to electric\nsystems using double-layer capacitors or flywheels. The\npaper focusses on a hybrid system with realistic parameters\nconcerning mass, power, and energy content that should be\napplicable to both existing and newly built vehicles.\nMethods A simulation process that is based on the 1-d-multidomain\nsimulation tool Imagine.Lab AMESim is presented. The\nsimulation comprises a conventional and an alternative drive\ntrain as well as the longitudinal dynamics of the vehicle along\nwith the control of the vehicle motion. Energy-efficient driving\ntechniques and timetable restrictions are taken into account when\ncomparing train runs of different drivetrain configurations.\nResults Simulations based on real route data for eight different\nrailway lines show a reduction of fuel consumption between\n5 and 16 % due to the hydrostatic recuperation of\nenergy. Station spacing and mean line gradients prove to be\nimportant line-side factors impacting fuel economy.\nConclusions Hydrostatic recuperation represents a feasible solution\nfor railcars, provided that possible spatial and economic\nobstacles can be overcome. As the simulation results are promising,\nfurther hybrid configurations will be considered for simulation.\nA comprehensive comparison to models of hybrid\ndiesel railcars using different energy storages is the next step.
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