Abstract
As conventional energy resources are diminishing and pollution is increasing especially in urban environments, the automotive industry from around the world is researching and developing new systems that reduce fuel consumption and pollutant emissions.
Hydraulic hybrid systems are an important part of hybrid technology. Hydraulic hybrid systems have the advantage of high power density and the system of recovering the braking energy is able to work at high frequencies of loading/unloading conditions. The main disadvantage of hydraulic hybrid propulsion systems is due to its lower efficiency towards mechanical transmissions. For this reason investigations are focused to increase hydraulic efficiency for example pumps and hydraulic motors with distribution controlled electronic, whose efficiency is 95%. Another direction is the primary source of hydraulic energy. Functional features of hydraulic systems allow optimized solutions for primary engine sources. A direction that needs to be researched is the free piston engine.
This paper describes simulation results of a free piston engine that generates the hydraulic energy needed by hybrid hydraulic vehicle propulsion. The method of analysis used in achieving free piston simulation is AMESIM, and the system analyzed in this paper is a free piston internal combustion engine. This paper highlights the engine thermodynamic parameters for different operating conditions.
Keywords: Free-piston; Hybrid-hydraulic; internal combustion