Author(s)

J. Bemdt, N. Janig, C. Jefferson, A. Lohner & F. Thoolen

Abstract

Urban transport is estimated to account for up to 16% of global CO] emission, of which up to 40% is due to energy dissipated in friction brakes. Hybrid propulsion systems incorporating efficient energy storage not only allow the optimal operation of the engine at constant speed and load but also allow brake energy recovery. Moreover, electric vehicle ride quality and passenger comfort is offered without the need for overhead electrification. This paper describes a flywheel energy storage system, with 93% energy storage efficiency, developed for passenger transit vehicles by which over 30% fuel savings can be achieved on urban driving cycles. The constant load on the engine a

Keywords