Papers by Keyword: Fuzzy-Logic-Controller

Abstract: The main subject matter of the paper is the application of adaptive control systems. This type of control is particularly useful for processes and machines with variable parameters. Classic controllers in this case are not satisfactory. Therefore a research work was initiated on advanced algorithms of control. The paper analyzes algorithms based on fuzzy logic. It should be noted that parameters of fuzzy controllers require adjustment to changeable process (machine) parameters for which an adaptive mechanism is required. The proposed algorithm has been tested on a laboratory stand with a hydrostatic transmission, which is a non-linear and a non-stationary object.

Abstract: Microcontrollers are small devices commonly used for control purposes over a wide range of applications. As the control strategies and the selection of hardware differ from one application to another, it is a common practice for engineers to develop the application programs based-on the selected hardware and the control methodologies. Such development process requires time for programming and testing, especially for large projects which need to interface and integrate with a number of different hardware and software. This paper presents an approach using the concept of soft development modules to shorten the application program development time for control systems using microcontrollers. A set of soft modules has been developed for a widely used microcontroller. The testing conducted on the serial communication and fuzzy logic control modules successfully produced application programs within a much shorter time, and reduced human programming errors. The application of soft development modules will allow system developers to focus on the system design level without the need to spend large amount of time on generic programming details. Such an approach provides a useful programming development platform for future applications using microcontrollers.

Abstract: In this study, we developed a fuzzy-logic-controlled PGO (Power Gait Othosis) that controls the flexion and extension of each PGO joint using bio-signals and an FSR sensor. The PGO driving system works to couple the right and left sides of the orthosis by specially-designed hip joints and pelvic section. This driving system consists of the orthosis, sensor, and control system. An air supply system for muscle action is composed of an air compressor, 2-way solenoid valve (MAC, USA), accumulator and pressure sensor. The role of this system is to provide constant “air muscle” with compressed air at the hip joint. With the output signal of the EMG and foot sensors, air muscles assist the flexion of the hip joint during the PGO gait.