Proportional control

About: Proportional control is a research topic. Over the lifetime, 3756 publications have been published within this topic receiving 49050 citations.

Multi-port self-regulating proportional pressure control valve

Abstract: A multi-port, self-regulating, proportional control valve preferably uses a load output feedback system to produce working fluid load output pressures that are proportional to pilot control fluid pressures. In some embodiments, the control valve is programmable and capable of different load output pressures selected either prior to, or during, operation. The control valve apparatus according to the present invention is capable of a center-off or neutral condition that requires substantially no pilot control flow when there in no control valve output flow.

Converting a Switching Solenoid to a Proportional Actuator

Abstract: Solenoids are presently used as cheap and robust switching components. These are variable reluctance devices with their characteristics dictated by a highly nonlinear magnetic circuit. This paper describes the research work done on converting a switching solenoid into a proportional device. It first investigates the magnetic characteristics of a solenoid, followed by developing a control model for the device. Based on this model, a dual rate cascade control scheme with a nonlinear force mapper is proposed for proportional control. This scheme is tested out by simulation and implemented on a Digital Signal Processor based controller.

Position feedback in force control of industrial manipulators - An experimental comparison with basic algorithms

Abstract: This paper investigates simple position based force control algorithms for an industrial robot. A lot of approaches to robot force control published in the previous three decades are difficult to implement in commercial robot controllers. This fact is one reason why force controlled robots rarely appear in industrial applications. On the other side force control may improve some robot tasks like automated assembling or material processing. Therefore, is seems to be necessary to concentrate on simple controller structures on the field of robot force control which are easily realizable and adjustable. For this purpose in this paper linear standard control algorithms have been selected and implemented with a real robot. One proposed structure is the proportional controller with positive position feedback which dealt probably here for the first time and shows very good control behavior. Some proposals to parameterization of different controllers are given and their performance with respect to contact detection, impact and response to setpoint changes is shown and compared by practical experiments.

The Application of Fuzzy Control Strategy in Servo Feed Control of Wire Electrical Discharge Machining

Abstract: In this paper, a detailed discussion of the design of a fuzzy controller for servo feed control in wire electrical discharge machining (WEDM) is presented from the viewpoint of industrial application and implementation. The proposed controller contains two control loops. The main loop employs fuzzy logic as a rule-based control strategy for the gap voltage control. The output scaling factor of the fuzzy controller is on-line adjusted to obtain better control performance. A secondary loop is used to maintain machining stability by adjusting the reference voltage. The developed control system is tested under the conditions of approach machining, rough machining, and cutting a workpiece with a corner working path. Experimental results show the developed fuzzy control system is more feasible and effective for commercialised WEDM machines than a proportional controller.

FPGA-Based Speed Control of Synchronous Machine using a P-PI Controller

Abstract: In this paper, a P-PI speed controller for synchronous machine is developed. It is made up of both an internal and external speed control feedback loop. The internal one allows modifying the poles placement of the controlled system at the desired locations and the external one allows imposing the shape and the dynamic of the speed response. In order to ensure an efficient speed control operation, an accurate speed estimator that estimates the rotation speed from the mechanical rotor position provided via an absolute encoder is also developed. Experimental results carried on a prototyping platform are given to illustrate the efficiency of the developed synchronous machine speed controller.