| This paper focuses on the design and implementation of intelligent hybrid-bus data collecting and processing system. Based on one-wire techniques and its digital sensors, a hybrid-bus system is designed; Then with Field-bus techniques, a Lonworks hybrid data collecting system is constructed for the monitoring of distributed targets; In order to realize real-time measurement and control on large-scale distributed system, GPRS SMS technique is adopted for the realization of the wireless data collecting system; Moreover, in order to improve the efficiency of control systems, a method of designing intelligent hybrid data collecting system is proposed based on multi-agent theory, and the multi-agent model and hardware structure are also discussed in detail with the fusion of one-wire and fieldbus techniques.Today, the research of integrating techniques on DCS prevails in the field of industrial control. In large-scale DCS, there are many distributed detecting targets and serious disturbance. So, not only the performance of sensors should be taken into account but also the system structure should be properly selected. Furthermore, the optimization of topological structure and simplification of hardware structure should also be considered seriously iN order to attain the target performance of system. The development of one-wire technique, Fieldbus technique and GPRS wireless communication technique propose a perfect way of realizing intelligent distribution and measurement. Moreover, DAI and agent theory provide powerful theoretical support to improve the system's ability of intelligent identification, intelligent learning and anti-noise.One-wire bus is a new technique based on CDMA and STD. It has simple structure, low cost, direct control via computer or microprocessor and simple program. The new type of one-wire digital sensor, which is integrated with thermometer, A/D, controller, ROM, RAM, can communicate with server computer through 1 wire and without any other accessories, Moreover, 64 sensors can share one single line which makes system structure concise and easy. But its limited hardware structure and driving ability make it difficult to build up remote one-wire systems.Fieldbus is often adopted in the construction of large-scale DCS. Integrated with digital communication technique, computer technique, automatic control technique, network technique, intelligent apparatus etc, its data communication has the property of highreliability, real time and flexibility. In PCS, multiple equipments connect to a shared bus through multiple nodes, which makes it possible for node-to-node communication, resource sharing, and less line connection. In order to realize a low cost, large-scale remote DCS, a hybrid-bus data collection system is designed with the fusion of Fieldbus and one-wire techniques. The reliability of this system depends on reliability of single equipment and of key components' redundancy. However, these systems will break down if any pat fails. Moreover, the measurement and control modules lack of the ability of self-adapting and self-decision. Single control and processing system can't deal with complicated situations effectively when there are many components and many kinds of information. Therefore, it's necessary to design a measurement and control system with the properties of reconstruction, robustness, quick-responding ability as well as fault-tolerate ability. Agent theory provides a powerful basis for this system, and hybrid-bus technique provides an efficient way for the intercommunication of Agents. It is proved that this system has the following features: information-perception, distribution, concurrence, self-decision and self-adaptation.However, line transportation seems impossible when the detecting targets is very distributed and it is difficult to put lines there. At this time, GPRS shows us a new method for remote control. There are lots of conditions fit for using GPRS: (1) traditional system can't be used or has difficulty to implement; (2) the system scale is large...
|
PDF Full Text Request