In our previous study, the small-sized quasi-servo valve using two inexpensive on/off valves was developed and tested. The pressure control type quasi-servo valve was also proposed and tested by using the quasi-servo valve, a pressure sensor and an embedded controller. In this paper, the pressure control type quasi-servo valve is applied to a force control of the pneumatic cylinder, and its control performance is investigated. | Journal of Automation and Control Engineering Vol. 4, No. 3, June 2016 Application of Pressure Control Type QuasiServo Valve to Force Control System Y. Moriwake, S. Dohta, T. Akagi, and S. Shimooka Department of Intelligent Mechanical Engineering, Okayama University of Science , Okayama, Japan Email: t14sd01my@, dohta@, akagi@, t14rm01ss@ an application of the pressure control type quasi-servo valve, the force control system is built and tested by using a pneumatic cylinder. The force control system consists of the pressure control type valve, a pneumatic cylinder and an electric linear actuator. Abstract—Today, the aged people are rapidly increasing and the number of children is decreasing in Japan. This social problem causes the demand of the care and welfare equipment to support a nursing and a self-reliance for the senior. For example, a power assist device for reducing the burden of the user has been researched and developed. The purpose of this study is to develop a small and light-weight pneumatic control valve and to apply it to the care and welfare equipment. In our previous study, the small-sized quasi-servo valve using two inexpensive on/off valves was developed and tested. The pressure control type quasi-servo valve was also proposed and tested by using the quasi-servo valve, a pressure sensor and an embedded controller. In this paper, the pressure control type quasi-servo valve is applied to a force control of the pneumatic cylinder, and its control performance is investigated. II. Fig. 1 shows the schematic diagram of the quasi-servo valve developed before [5]. The valve consists of two on/off type control valves (Koganei Co. Ltd., G010HE-1) whose both output ports are connected to each other. One valve is used as a switching valve to exhaust or supply, and the other is used as a PWM control valve that can adjust output flow rate like a variable fluid resistance. The valve connected with the actuator is a .
