Thomas Eymann

Vehicle Energy Management – Energy Related Optimal Operating Strategies for CO2 Reduction

Further reduction in CO2 will be a major challenge for the automotive industry in the coming years. One of the biggest challenges will be to achieve the proposed EU CO2 emissions limit of 95 g/km in 2020. This will require a 38% reduction in CO2 emissions, based on the average value of new European registrations in 2008 (154 g/ km CO2). In addition to combustion engine improvements, vehicle energy management offers a huge potential to reduce CO2 emissions through innovative electronic systems. Starting from a top-down approach, we have developed operating strategies that offer the possibility to optimize the energy usage of the entire system. Energy recuperation is the main element of the operating strategies, and the vehicle systems and components must be adapted accordingly. The energy management strategies described in this paper are based on a “virtual” average 2008 European vehicle. For this vehicle the following driving cycles were investigated in the simulation: New European Driving Cycle (NEDC), Common Artemis Driving Cycle (CADC) and a derivation of the CADC driving cycle. We assumed that combustion engines improvements will reduce CO2 emissions by about 25% in 2020. This paper shows how an appropriate vehicle energy management process can provide the additional CO2 reductions needed to achieve the proposed EU limit of 95 g/km in 2020.