Browse Publications Technical Papers 2019-01-1207

Equivalent Consumption Minimization Strategy for a Power Split Supercharger 2019-01-1207

Low voltage hybridization ( <60 V) supports engine start/stop, regenerative braking, and constrained torque assist/regeneration at a lower cost. This work studies the potential benefits of a novel hybrid system, called a power split supercharger (PSS). A 9 kW motor is shared between boosting the engine or providing hybrid functionalities, hence it can couple with a small engine and still provide good acceleration. The PSS operation is limited to only one of the parallel hybrid or boosting modes at each time instance, though. In this work an equivalent consumption minimization strategy (ECMS) is developed for selecting the PSS mode and the motor torque during hybrid mode. The PSS operation is simulated over standard EPA drive cycles with an engine mean value model that captures detailed air path and PSS dynamics. The results show that on the combined cycle the PSS improves the vehicle fuel economy by around 19.5% compared to a vehicle with a turbocharged engine, which is more than 90% of the fuel economy improvement previously predicted through a dynamic programming global fuel economy optimization.


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