Topic
Proportional control
About: Proportional control is a research topic. Over the lifetime, 3756 publications have been published within this topic receiving 49050 citations.
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TL;DR: The variance of error at the output of a digital control system due to input data quantization and product rounding in a digital controller is derived.
13 citations
Patent•
25 Aug 1980TL;DR: In this paper, a method of driving a solenoid-operated proportional control valve is described, in which a valve member is displaced in proportional relation to current supplied to a solanoid under control of a control signal.
Abstract: A method of driving a solenoid-operated proportional control valve is disclosed. The solenoid-operated proportional control valve is of the kind in which a valve member is displaced in proportional relation to current supplied to a solenoid under control of a control signal, and the method comprises adding a predetermined value to the control signal when the valve member starts to move to open the solenoid-operated proportional control valve from its full-closed position or subtracting a predetermined value from the control signal when the valve member starts to move to close the solenoid-operated proportional control valve from its full-open position.
13 citations
TL;DR: Simulation and experiment results verify that the PI controller tuned by Skogestad internal model control (SIMC) method is less sensitive to the rate limit variation and is more suitable for processes which have severe actuator rate limit.
Abstract: The control performance can be worsened by actuator rate limit, which can result in amplitude attenuation and phase delay in process control. In some extreme situations, actuator rate limit may bring about the system non-convergence. This paper focuses on the control difficulties and solutions of first-order plus time-delay (FOPTD) systems caused by rate limit. The influence of rate limit on stability regions of proportional–integral (PI) controller is analysed. Results show that a small rate limit value can reduce stability regions of PI parameters greatly. The negative correlation between the integral gain and the onset frequency, and the positive correlation between the proportional gain and the onset frequency are conducted. Moreover, the control performance of different PI tuning rules such as Skogestad internal model control, integral gain maximization, delay robustness-constrained optimization and Tyreus–Luyben tuning rules is evidently affected by rate limit. Simulation and experiment results verify that the PI controller tuned by Skogestad internal model control (SIMC) method is less sensitive to the rate limit variation and is more suitable for processes (the normalized dead-time is from 0.03 to 1) which have severe actuator rate limit. Tyreus–Luyben tuning rule is another optional method. In addition, the reasons why SIMC is not sensitive to rate limit variation are analysed. These analytical results can offer a guideline for practical applications.
13 citations
Patent•
24 Oct 2007
TL;DR: In this article, a method for controlling a dome-operated pressure regulator is described and a proportional control valve is used to control the pressure on at the dome side of the pressure regulator.
Abstract: A method for controlling a dome-operated pressure regulator is disclosed. The pressure at a dome side of the pressure regulator is measured. The operation of the pressure regulator is controlled based upon at least a received command signal and the measurement. A proportional control valve may be used to control the pressure on at the dome side of the pressure regulator. A controller and a system are also disclosed.
13 citations
TL;DR: A new development of the proportional control method for stable tracking control system for a mobile robot using the minimal root mean square error of deviation in wheel rotations for each wheel is presented.
13 citations