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The Scientific World Journal
Volume 2014 (2014), Article ID 498934, 9 pages
Research Article

Working Characteristics of Variable Intake Valve in Compressed Air Engine

School of Automation Science and Electrical Engineering, Beihang University, Beijing 100191, China

Received 25 July 2014; Revised 28 August 2014; Accepted 31 August 2014; Published 14 October 2014

Academic Editor: Arash Karimipour

Copyright © 2014 Qihui Yu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A new camless compressed air engine is proposed, which can make the compressed air energy reasonably distributed. Through analysis of the camless compressed air engine, a mathematical model of the working processes was set up. Using the software MATLAB/Simulink for simulation, the pressure, temperature, and air mass of the cylinder were obtained. In order to verify the accuracy of the mathematical model, the experiments were conducted. Moreover, performance analysis was introduced to design compressed air engine. Results show that, firstly, the simulation results have good consistency with the experimental results. Secondly, under different intake pressures, the highest output power is obtained when the crank speed reaches 500 rpm, which also provides the maximum output torque. Finally, higher energy utilization efficiency can be obtained at the lower speed, intake pressure, and valve duration angle. This research can refer to the design of the camless valve of compressed air engine.