Abstract
A hydraulic pressure control system with an accumulator and a servovalve has nonlinear and complicated dynamics which is induced by the gas dynamics of the accumulator and the nonlinear flow characteristics of the servovalve. Because of this, the effect of pressure control using the ordinary linear control method is insufficient. Therefore we apply the time delay control (TDC) method to this system. Using the state signal information that is observed before one sampling time step, the TDC method enables estimation of the influences of unknown dynamics and unexpected disturbances, and generation of a control signal to cancel their effects.However, if the control element has a delay characteristic, the ordinary TDC method may render the system unstable. In this paper, an extended TDC pressure control method is proposed. This proposed control method shows that by shifting the sampling instant of the state signal from the output instant of the control input, it is possible to avoid the influence of the delay characteristics of the control element. The effect of this control method is confirmed by simulation and experiments. Moreover, as an example of its application, we apply the extended TDC method to pressure control system of a hydraulic suspension mechanism which consists of an accumulator and a cylinder with a mass and a spring load.
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