Flexible Time-Triggered Sampling in Smart Sensor-Based Wireless Control Systems

: Wireless control systems (WCSs) often have to operate in dynamic environments where the network traffic load may vary unpredictably over time. The sampling in sensors is conventionally time triggered with fixed periods. In this context, only worse-than-possible quality of control (QoC) can be achieved when the network is underloaded, while overloaded conditions may significantly degrade the QoC, even causing system instability. This is particularly true when the bandwidth of the wireless network is limited and shared by multiple control loops. To address these problems, a flexible time-triggered sampling scheme is presented in this work. Smart sensors are used to facilitate dynamic adjustment of sampling periods, which enhances the flexibility and resource efficiency of the system based on time-triggered sampling. Feedback control technology is exploited for adapting sampling periods in a periodic manner. The deadline miss ratio in each control loop is maintained at/around a desired ...

• Type: Journal
• Year: 2008
• Where: CORR
• Authors: Feng Xia, Wenhong Zhao
• Keywords: CORR 2008, Dynamic Environments, Education, Network Traffic Load, Time-triggered Sampling