Abstract
The Hydraulic Hybrid Vehicle obtains energy for propulsion from two different sources, the Internal Combustion Engine (ICE) and a hydraulic pump/motor. Braking torque is supplied by operating the unit as a pump, and thus storing the otherwise lost kinetic energy of the slowing vehicle. During acceleration the unit is operated as a motor, using the stored energy to assist propulsion. A model of the systems was developed in the Matlab/Simulink environment then implemented into the automotive simulator ADVISOR. This paper outlines the procedures used for optimisation studies within ADVISOR, to find the ideal combination of system parameters, e.g., pump/motor displacement, accumulator size and pressures, that yield the best results for fuel consumption for a standard urban drive cycle.
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