In recent 20 years, energy saving has been done in many projects. However, in pneumatic system,\nit is not easy to determine or measure the air power flow because of the compressibility of pneumatic\nsystem. In this paper, we used air power meter (APM) to measure the energy consumption\nof flow in pneumatic cylinder actuator system. Meter-in circuit and meter-out circuit of speed\ncontrol system are used in this research. The model of cylinder system is based on four equations:\nstate equation of air, energy equation, motion equation and flow equation. The model estimates\nthe pressure change in charge and discharge side of cylinder, and also the displacement and velocity\nof the piston. Furthermore, energy consumption could theoretically be calculated when the\nchange of air state is regarded as isothermal change. Lastly, some data of these two circuits are\nshown, and the consumption of energy is discussed.
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