Hydraulic hybrid technology offers superior power density, when compared to competing vehicle hybrid technologies. This allows the hydraulic hybrid vehicle (HHV) to absorb most of the kinetic energy during braking. This paper estimates the fuel economy of a parallel HHV, based on Perodua Myvi passenger vehicle, controlled by a rule-based control strategy. The study simulates the HHV on city and highway drive cycles that are based on Malaysian roads. The simulation results show the parallel HHV offers 39% fuel economy improvement when operates on the city drive cycle and 31% fuel economy improvement on highway drive cycle.

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