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The 2D digital simplified flow valve is composed of a pilot-operated valve designed withboth rotary and linear motions of a single spool, and a stepper motor under continual control. How thestructural parameters affect the static and dynamic characteristics of the valve is first clarified and acriterion for stability is presented. Experiments are designed to test the performance of the valve. It isnecessny to establish a balance between the static and dynamic characteristics in deciding thestructural parameters. Nevertheless, it is possible to maintain the dynamic response at a fairly highlevel, while keeping the leakage of the pilot stage at an acceptable level. One of the features of thedigital valve is stage control. In stage control the nonlinearities, such as electromagnetic saturation andhysteresis, are greatly reduced. To a large extent the dynamic response of the valve is decided by theexecuting cycle of the control algorithm.
The 2D digital simplified flow valve is composed of a pilot-operated valve designed withboth rotary and linear motions of a single spool, and a stepper motor under continual control. How thestructural parameters affect the static and dynamic characteristics of the valve is first clarified and acriterion for stability is presented. Experiments are designed to test the performance of the valve. It isnecessny to establish a balance between the static and dynamic characteristics in deciding thestructural parameters. Nevertheless, it is possible to maintain the dynamic response at a fairly highlevel, while keeping the leakage of the pilot stage at an acceptable level. One of the features of the digital valve is stage control. In stage control the nonlinearities, such as electromagnetic saturation andhysteresis, are greatly reduced. To a large extent the dynamic response of the valve is stage. by theexecuting cycle of the control algorithm.