FKFS: Research in Motion: Energy Management

Energy Management

The reduction in CO₂ emissions required to achieve global climate targets presents an enormous challenge, particularly for the transport sector. When vehicle drives are electrified, the current drive task is decoupled from CO₂ generation. This gives rise to strategic challenges for vehicle operation which require optimum solutions. FKFS has many years of experience in developing energy management strategies: not only in high voltage and low voltage vehicle power supply systems, but also in operating local power networks, vehicle charging and energy generation equipment.

Operating Strategy Development

FKFS has been working on hybrid vehicle operating strategies for almost two decades now. While the degree of freedom for conventionally-powered vehicles is essentially limited to gear selection, when different drive types are used, further questions arise about the choice of drive path and the drive power distribution. As well as minimum-CO₂ coordination of the drivetrain, a central focus of our work at FKFS is to develop operating strategies for the simultaneous optimization of pollutant emissions and noise behavior (NVH) of hybrid structures. Because the energy converted from the fuel can be stored temporarily in the battery, it is possible to chronologically decouple the motor power from the currently-required drive power. This also gives rise to other opportunities for optimization using predictive cartographic information. FKFS has published a variety of papers on these topics in the course of our diverse research activities.

These include:

Fried, Oliver, Betriebsstrategie für einen Minimalhybrid-Antriebsstrang, 2003

Riemer, Thomas, vorausschauende Betriebsstrategie für ein Erdgashybridfahrzeug, 2012

Dreschinski, Andreas, Vorausschauende Betriebsstrategie für einen seriellen Hybridbus im Linienverkehr, 2013

Boland, Daniel: Wirkungsgradoptimaler Betrieb eines aufgeladenen 1,0 l Dreizylinder CNG Ottomotors innerhalb einer parallelen Hybridarchitektur, 2010

Winke, F.; Berner, H.-J.; Bargende. M.: Interactions of Engine Part-Load Optimization and Hybridization on Fuel Efficiency, SAE Hybrid and Electric Vehicle Technologies Symposium, 9-11.02.2016, Anaheim, USA.

Auerbach, M., Ruf, M., Bargende, M., Reuss, H. et al.: Potentials of Phlegmatization in Diesel Hybrid Electric Vehicles," SAE Technical Paper 2011-37-0018, 2011, doi.org/10.4271/2011-37-0018.

Boland, D.; Berner, H.-J., Bargende, M.: Simulative optimization of a 3-cylinder CNG engine within a parallel hybrid power train. Facing the Challenge of Future CO2 Targets: Impact on European Passenger Car Technologies, June 2009, Turin, Italy.)

Contact

Dipl.-Ing. Hans-Jürgen Berner

Ph.: +49 711 685-65714

Friction Reduction

Concerning friction reduction, FKFS is working on the following topics in particular:

Determination (strip method) and reduction of friction for individual engine components
High-precision torque measurement and thermostatic control of oil and cooling water
Temperature and pressure-controlled external oil supply
Determination of indicated mean effective pressure
Max. speed/torque 10,000 rpm / 725 Nm

Contact

Dr.-Ing. Ulrich Philipp

Ph.: +49 711 685-65622

Renewable Energy

To maximize the climate-protection potential offered by electro-mobility, to the greatest extent possible, the electricity used to charge the vehicle must come from renewable sources. Since energy provision does not need to occur at the actual moment of consumption, there are multifaceted opportunities for optimizing charging strategies on offer here. For example, there is potential to optimize local energy generation systems' own consumption, the load on the distribution network and even – by using energy recovery from the vehicle – the demand for fossil fuel energy.

Here different boundary conditions such as wear, ensuring mobility and user convenience need to be taken into consideration.

Contact

Dr.-Ing. Thomas Riemer

Ph.: +49 711 685-68131