Microcontroller Control Research Articles

Low-cost Distributed Embedded Control Systems

This paper presents how a complex distributed control system can be inexpensively achieved using low-cost controllers. These controllers will be interconnected in a network with an open communication bus called CAN. The development of integrated circuit manufacturing technology has increased the power and performance of the microprocessors and microcontrollers as opposed to its price, and if they also have communication capabilities, they can be used to implement low-cost distributed control nodes.Nodes with different computer architectures (from 16 to 32 bits processors) could be combined as long as the complexity of a given application. This approach was tested in a simulated process, using a dsPICTM (Microchip, 2006) microcontroller control implementation, supervised by an XScale microcomputer with a GPL (General Public License) real-time operating system as RTLinux.

APPROACH TO FEED-FORWARD ADAPTIVE CONTROL FOR VARIABLE PUMP AND VALVE CONTROLLED ELECTRO-HYDRAULIC SYSTEM

The variable pump makes the open loop gain change and decrease , the tracking control accuracy is difficult to be achieved by traditional feedback control A/O cascade control. Effective compensation to the change of open loop gain can be achieved with micro-controller and compound control methods. Using the MCS-96 chip technology, feedback control, feedforward control and adaptive control principles, The chip computer feed-forward adaptive controller is developed, and the adaptive digital control to the system is realized and tested. The tests results show that the controller is the effective control method for the variable pump valve controlled system.

MC68HC11 Microcontroller Control of a Greenhouse Environment as a Time Delay System

The paper presents a microcontroller design and control implementation for modern greenhouses. The nature of the greenhouse problems in conjunction with the microcontroller capabilities is given as a time delay control system and states decoupling problems are discussed. The greenhouse modelcontroller system operation is simulated and the results are discussed Different plants greenhouse environmental demands are taken into account by changing controller set points, control architectures and data base integration. Greenhouse control is considered a batch control system during start-up and run as continuous time discrete control algorithm later in the background. Greenhouse control is a typical time delay system.

A communication method for an industrial multiple-microcontroller distributed control system

A group of microcontrollers was used in the real-time control of a cement production process both for their low cost and for their reliability. They are connected with each other and linked up with a central computer to form a multiple microcontroller control system or loosely coupled distributed control system. This paper describes the design method used for the system and its behaviour at the message passing level. Problems relating to data communication are addressed and solutions to these problems are then presented in detail. A comparison between several candidate communication architectures is given.