Browse Publications Technical Papers 2019-24-0198
2019-09-09

Hybrid Powertrain Technology Assessment Through an Integrated Simulation Approach 2019-24-0198

Global automotive fuel economy and emissions pressures mean that 48V hybridisation will become a significant presence in the passenger car market. The complexity of the powertrain solutions is increasing in order to further increase fuel economy for hybrid vehicles and maintain robust emissions performance. However, this results in complex interactions between technologies which are difficult to identify through traditional development approaches, resulting in sub-optimal solutions for either vehicle attributes or cost. This paper presents the results from a simulation programme focussed on the optimisation of various advanced powertrain technologies on 48V hybrid vehicle platforms. The technologies assessed include an electrically heated catalyst, an insulated turbocharger, an electric water pump and a thermal management module (a coolant valve replacing a conventional thermostat). The novel simulation approach undertaken uses an integrated toolchain capturing thermal, electrical and mechanical energy usage across all powertrain sub-systems. Through integrating 0-D and 1-D sub-models into a single modelling environment, the operating strategy of the technologies can be optimised while capturing the synergies that exist between them. This approach enables improved and more informed cost/benefit ratios for the technologies to be produced and improves vehicle attributes by identifying the optimum strategy for the vehicle as a complete system. The results show the potential for CO2 reductions of the order of 2-5% at no additional cost, through co-optimisation of the technologies in a single simulation environment. The simulation work forms part of the THOMSON project, a collaborative research project aiming to develop cost effective solutions, based on 48V architectures, in order to reduce the environmental impact of the transportation sector through a clever combination of advanced engines technologies, electrification and wider use of alternative/renewable fuels. The THOMSON project has received funding from the European Union’s Horizon 2020 Programme for research, technological development and demonstration under Agreement no. 724037.

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