Abstract
Research and/or Engineering Questions/Objective
The aim of this paper is to evaluate the energy saving possibilities and limitations through powertrain hybridization using a simulation approach. The state of the art of hybrid vehicles and their control strategies were experimentally evaluated and the test results will be used to support vehicle energy consumption simulations.
Methodology
Several hybrid vehicles were experimentally evaluated in the facilities of Vehicle Center of Sustainable Mobility. Tests included both, on-board measurements in a normal traffic and test-bench measurements on roller-dyno. The simulations of vehicle energy consumption in a driving cycle are based upon the measurement results. The simulation models are created in block diagram environment and are based on in-house library of vehicle components that are mathematically represented by multi body simulation approach.
Results
The simulation results of a hybrid vehicle with power split device in NEDC and ARTEMIS driving cycles is compared to measurement results in order to validate the control strategy that is used in the simulation. The energy consumption and efficiency of this virtual hybrid vehicle is then compared to its modifications that are using various levels of hybridization (from conventional engine powered vehicle to electric vehicle).
Limitations of this study
An important limitation of the current study is the limited amount of measurement results and vehicle data. It is therefore not the intention to exactly calibrate the virtual vehicle model with measurement results, but rather to validate the control strategy of energy flows control in hybrid powertrain. The limitation on the side of simulation tool is that the tool calculates only the longitudinal dynamics of the vehicle.
What does the paper offer that is new in the field including in comparison to other work by the authors?
This paper extends the work of authors in the area of vehicle consumption simulations. The papers published by the authors so far did not cover the topic of hybrid vehicles with the power split device.
Conclusions
The efficiency and energy consumption of powertrains with various levels of hybridizations have been evaluated in NEDC and ARTEMIS driving cycles using the in-house vehicle simulation tool. Simulation results have been compared to on-board and test bench measurement results.
KEYWORDS – hybridization, energy consumption, vehicle powertrain simulation, electro mobility, powertrain efficiency