Abstract
Currently, in the field of vehicle engineering, researchers are focused on finding a new type of high-efficiency vehicle. Based on the conventional powertrain system, the hybrid pneumatic power system (HPPS) is a type of hybrid system that focuses on compressed air power instead of the electrochemical energy conversion of a battery. This study concentrates on the integral efficiency of the HPPS. The HPPS was operated under different conditions of internal combustion engine speed, fuel consumption, compressor speed, pressure in air tank, cross-sectional area, and air motor efficiency. Based on this, the best operating condition of the HPPS was defined, and the integral efficiency of the HPPS was measured under this condition. The experimental results show that the system integral efficiency can reach up to 45.3%. It is higher than 28% when using individual internal combustion engines. In addition, the HPPS could reduce fuel consumption by 38% during its best performance.
Highlights
In addition to the technical advancement of the internal combustion engine (ICE), a significant amount of research effort has been given to designing a new type of vehicle that utilizes the ICE, called the hybrid electric vehicle (HEV); it uses both an electric motor and an ICE to generate power for propulsion
The results show that this solution can reduce 58% fuel consumption [21]
When our hybrid pneumatic power system (HPPS) is running, ICE connects with the compressor to create compressed air
Summary
In addition to the technical advancement of the internal combustion engine (ICE), a significant amount of research effort has been given to designing a new type of vehicle that utilizes the ICE, called the hybrid electric vehicle (HEV); it uses both an electric motor and an ICE to generate power for propulsion. The major advantages of the HEV are increased energy efficiency and a reduced greenhouse effect compared with conventional vehicles. Combined with reductions in energy and environmental pollution for future use, air-powered vehicles present several superiorities [11,12]. The cost of air power is much lower than that of fossil fuels, such as in the case of electric, battery, and fuel-cell vehicles. Dimitrova and Maréchal demonstrated that the pneumatic driveline was up to 67% lighter than the lightest competing hybrids, and that fuel consumption could be reduced from 35% to 30% [13]
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