Design Of Pneumatic Automobile Power Systems

In recent years, Air pollution has became more and more serious, fog and haze appears frequently, air pollution has become the most important issue of environmental pollution that have to be solved. Air pollution in large part is caused by the exhaust emissions from motor vehicles, the traditional car not only causing serious environmental pollution but also consume a large amount of non-renewable fossil fuels, which will be exhausted in the near future. Pneumatic car provides a good idea to solve such problems, because the pneumatic car use compressed gas as power source, which will not produce any pollution emissions This met the requirements about energy conservation.At the first of this paper presents a design of pneumatic reciprocating piston engine, uses compressed gas to pushes the piston to do reciprocating linear motion, and exchanges reciprocating motion into rotary motion by gear and exports. Designed a two-stage pneumatic engine, introduced the working principle, and established mathematical model, completed the structural design of the overall structure and some components of the pneumatic engine. Using AMESim to verify the feasibility of the aerodynamic design of the engine, research effects of some parameters on the performance of the pneumatic engine and provides a theoretical basis.Air pressure in the high-pressure gas cylinders stored in the car is much higher than the work pressure of pneumatic engine, so it needs a high-pressure gas decompression system between the high-pressure gas cylinders and the engine. In order to reduce the energy loss of high-pressure gas during the process of decompression system,the system decompress by a volumetric approach, the paper also analyzes the changing process of the expansion of high-pressure gas, and design a multi-stage differential-pressure gas decompression system, introduced the main components with the work process decompression system. Using simulation software to verify the feasibility of high-pressure gas decompression system and research the impact of changing in the heat transfer coefficient and the cylinder bore on the property of pneumatic engine.Research the property of pneumatic engine by bench test, Demonstrate the correctness of the early theoretical work through the collection and analysis of test data, and provide reference for the study of the pneumatic engine.