Simulation of Greenhouse Climate Monitoring and Control with Wireless Sensor Network and Event-Based Control

Sensors

Andrzej Pawlowski²  Jose Luis Guzman²  Francisco Rodríguez²  Manuel Berenguel²  José Sánchez¹ 

[1]Department of Computer Science and Automatic Control, UNED C/. Juan del Rosal, 16, 28040, Madrid, Spain

[2] E-Mails:

[3]Department of Languages and Computation, University of Almería

[4] Ctra. Sacramento s/n, 04120, Almería, Spain

[5] E-Mails:

关键词: Event-based control;    Wireless Sensor Network;    greenhouse climate control;   

DOI  :  10.3390/s90100232

来源: mdpi

【 摘 要 】

Monitoring and control of the greenhouse environment play a decisive role in greenhouse production processes. Assurance of optimal climate conditions has a direct influence on crop growth performance, but it usually increases the required equipment cost. Traditionally, greenhouse installations have required a great effort to connect and distribute all the sensors and data acquisition systems. These installations need many data and power wires to be distributed along the greenhouses, making the system complex and expensive. For this reason, and others such as unavailability of distributed actuators, only individual sensors are usually located in a fixed point that is selected as representative of the overall greenhouse dynamics. On the other hand, the actuation system in greenhouses is usually composed by mechanical devices controlled by relays, being desirable to reduce the number of commutations of the control signals from security and economical point of views. Therefore, and in order to face these drawbacks, this paper describes how the greenhouse climate control can be represented as an event-based system in combination with wireless sensor networks, where low-frequency dynamics variables have to be controlled and control actions are mainly calculated against events produced by external disturbances. The proposed control system allows saving costs related with wear minimization and prolonging the actuator life, but keeping promising performance results. Analysis and conclusions are given by means of simulation results.

【 授权许可】

CC BY   
© 2009 by the authors; licensee Molecular Diversity Preservation International, Basel, Switzerland.