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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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Patent
20 Mar 1995
TL;DR: In this paper, an electromagnetic proportional control valve 30 is used to provide resistance force to the flow of the working fluid according to its degree of opening, generating damping force, and various control amounts calculated in the controller 40 are analyzed, for example, control state amounts such as pressure before and after the electromagnetic proportional controlling valve 30, opening area, piston speed, piston stroke amount etc.
Abstract: PURPOSE: To adjust and control a vibration damping device and to retain proper operation by grasping actually controlled damping force characteristics from pressure before and after a control valve, the opening area of the control valve, piston speed, piston stroke etc. CONSTITUTION: Right and left cylinder chambers 13a, 13b are communicated with each other through a communicating circuit 15. An internally filled working fluid moves between both the cylinder chambers in accordance with displacement evolved by a piston 11. The communicating circuit 15 is provided with an electromagnetic proportional control valve 30 to provide resistance force to the flow of the working fluid according to its degree of opening, generating damping force. Inputted to a controller 40 are signals from a displacement sensor 31 for detecting displacement afforded by the electromagnetic proportional control valve 30, pressure sensors 32a, 32b for detecting pressure in both the cylinder chambers. Various control amounts calculated in the controller 40 are analyzed, for example, control state amounts such as pressure before and after the electromagnetic proportional control valve 30, opening area, piston speed, piston stroke amount etc. Suitability of a damping action to its structure is determined to provide the optimum damping force characteristics.

16 citations

Journal ArticleDOI
TL;DR: A two-step method where a proportional Controller is designed first and then a PID controller is designed for the compensated system can be used to design the 2 degree of freedom control systems.
Abstract: Proportional−integral−derivative (PID) controller tuning method based on the internal model control is one of the simplest tuning rules and provides excellent performances for various processes. It has one design parameter which determines the speed of closed-loop response. As the design parameter changes, the controller gain changes while integral and derivative times usually remain constant. Hence, the method can be extended easily to the design of multiloop control systems because there are simple methods to find stable multiloop proportional controller gains. However, integral and derivative times independent of the design parameter can cause poor closed-loop responses for some processes such as those with small dead times. For such processes, 2 degree of freedom control systems are usually required, and a two-step method where a proportional controller is designed first and then a PID controller is designed for the compensated system can be used to design the 2 degree of freedom control systems. This...

16 citations

Journal ArticleDOI
TL;DR: Simulation and experimental results validate the excellent steady-state and transient performance of the proposed control scheme and provide the exact comparison of the suggested method with the conventional multi-loop control method.
Abstract: This paper proposes an improved multi-loop control scheme for the single-phase uninterruptible power supply (UPS) inverter by using a plug-in odd-harmonic repetitive controller to regulate the output voltage. In the suggested control method, the output voltage and the filter capacitor current are used as the outer and inner loop feedback signals, respectively and the instantaneous value of the reference voltage feedforwarded to the output of the controller. Instead of conventional linear (proportional-integral/-resonant) and conventional repetitive controllers, a plug-in odd-harmonic repetitive controller is employed in the outer loop to regulate the output voltage, which occupies less memory space and offers faster tracking performance compared to the conventional one. Also, a simple proportional controller is used in the inner loop for active damping of possible resonances and improving the transient performance. The feedforward of the converter reference voltage enhances the robust performance of the system and simplifies the system modelling and the controller design. A step-by-step design procedure is presented for the proposed controller, which guarantees stability of the system under worst-case scenarios. Simulation and experimental results validate the excellent steady-state and transient performance of the proposed control scheme and provide the exact comparison of the proposed method with the conventional multi-loop control method.

16 citations

Patent
06 Apr 2009
TL;DR: In this paper, an automatic pressure regulator for a flow regulator was proposed, where overshoot is prevented from occurring in flow rate on the output side when the output flow rate of the flow regulator is altered or the type of gas to flow is altered.
Abstract: Provided is an automatic pressure regulator for a flow regulator wherein overshoot is prevented from occurring in flow rate on the output side when the output flow rate of the flow regulator is altered or the type of gas to flow is altered. An automatic pressure regulator (20) of gas to be supplied to a flow regulator comprises a pressure regulation valve (15) driven by a piezoelectric element, a control pressure detector (14) provided on the output side of the pressure regulation valve (15), and a controller (16) receiving a detection value (P2) of the control pressure detector (14) and a set value (Pst) of control pressure and supplying a control signal to the piezoelectric element drive section of the pressure regulation valve (15) by proportional control system in order to regulate the opening of the valve, wherein the integral action is disabled so that a residual deviation is produced in the control pressure by the proportional control system of the controller.

16 citations

Proceedings ArticleDOI
16 May 2016
TL;DR: Real-time experimental results highlight the utility of the classical and augmented -1 adaptive control laws in assistance-as-needed and resistive rehabilitation paradigms.
Abstract: This paper deals with the control of a lower limb exoskeleton acting at the knee joint level. Classical −1 adaptive control law is proposed to ensure assistance-as-needed and resistive rehabilitation following a desired trajectory that is defined by a therapeutic doctor. This control law introduces a time lag within the desired trajectory tracking due to the presence of a filter in its structure. In order to mitigate this drawback, the classical −1 adaptive control is augmented by a nonlinear proportional control. The classical and augmented −1 adaptive control laws are tested in real-time using the Exoskeleton Intelligently COmmunicating and Sensitive to Intention (EICOSI) of LISSI-lab. Real-time experimental results highlight the utility of these control laws in assistance-as-needed and resistive rehabilitation paradigms.

16 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20237
202217
202162
2020110
2019150
2018150