FPLG Library


Kämmerer AG : j.stiftl@kaemmerer-group.com

Industry / Process

  •  Automotive

Short Description

An important criterion for the success of an unconventional automotive component is its efficiency in a complete system. The FPLG Vehicle library provides models for fuel consumption investigations and driving dynamics analysis control of hybrid cars. Furthermore Modelica library for the empirical modelling of the combustion process of the free piston linear generator is developed. On the basis of FPLG component models the Modelica capability for HIL applications of this system is analysed.

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Long Description

The free piston linear generator is a HCCI and flexfuel usable electrical power generation unit with variable compression and variable stroke designed for vehicle propulsion. In this project several aspects of the FPLG development and vehicle interaction are investigated.

Objectives of the library:

  •  FPLG vehicle model for fuel consumption investigations
  •  FPLG vehicle model for driving dynamics analysis and control
  •  FPLG hard realtime model for HIL applications
  •  Empirical modelling of combustion process

The aim of the total vehicle modelling is to state the fuel consumption that can be expected by an electric vehicle powered by a FPLG. For this purpose the approach of a longitudinal vehicle model consisting of simplified drive-train components is considered. The library provides steady-state based models that describe the behaviour of the driveline components at the system boundary. As driving strategy is a key technology for the reduction of fuel consumption, it is analysed for different HEV concepts (e.g. Full-Hybrid, RangeExtender) in each case.

The optimized driving strategies and the power supply unit (FPLG and battery) are finally brought together with a full dynamic car model. Its power-train is driven by four separate electric engines which are integrated within the wheel-hubs. It is possible to develop new control strategies for chassis control which directly interact with energy management strategies. Their influences on each other are directly covered by one model. This model can also be used for more realistic drive cycle analysis in a virtual 3D world, which cannot be modelled with the simplified 1D car. In order to provide more sophisticated simulation of the FPLG empirical models of combustion process are developed. The focus is set on the exact representation of the thermodynamic properties of the cycle medium. Different approaches for the description of ideal gas properties (e.g NASA polynominals) and real gas properties (e.g. Zacharias) are realised. The combustion process itself is modelled as a vibe combustion.

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Presentation during the ITEA2 symposium 2009 in Madrid



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Modelica 2009 conference paper