Abstract
The charging process is one of the critical processes in the hydro-pneumatic driveline storage system. It converts the kinetic energy of the vehicle braking and coasting to the compression energy. This energy is stored in the storage device called the accumulator. The system is planned to be used on the dual hydro-pneumatic hybrid driveline and applied to a hydraulic hybrid passenger car. The aim of this paper is to find the effect of charging parameters on the storage performance through simulation. Through the storage behaviour, the desirable and optimal sizing of the accumulator can be selected. The paper emphasized on the effect of pressure elevation, pre-charge pressure, effective volume, thermal reaction and required time of the accumulator’s charging process. The circuit of charging process has been designed and simulated by using the hydraulic tool in the Automation Studio software. The simulation results were corroborated through the component specification for data rationality. Through the simulation, it was found that pre-charge pressure had a significant effect on the charging process. It determined the efficiency of the effective volume. The higher the pressure elevation, the higher the effective volume. Nevertheless, the more energy required to compress the nitrogen gas in the bladder. Besides, in term of volume displacement, higher volume displacement reduced charging time and lower the fluid temperature. The simulation had been positively highlighted the critical point in charging process which later on, benefited the sizing process in the component selection specification.
Highlights
Hybrid technology has become so popular in the field of automotive due to the factor of energy-saving, environmentally friendly and more efficient compared to conventional vehicles [1]
The graphs show that the effective volume has proportional relation to the pressure elevation
Hydraulic oil pressure is at the level of negative (-ve) due to its level of pressure is lower than pre-charge value [14]
Summary
Hybrid technology has become so popular in the field of automotive due to the factor of energy-saving, environmentally friendly and more efficient compared to conventional vehicles [1]. There are several hybrid technology has been developed such as hybrid electric, hybrid flywheel, hybrid hydraulic and pneumatic. Hybrid pneumatic and flywheel are still in the phase of research and development. Hybrid hydraulic turns popular among heavy vehicles such as buses and garbage trucks [4][5][6]. This statement is entirely realistic because it is a power density type of energy. Many research were done to ensure the success of this technology It is still in the phase of research and development [8][9]
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