A Higher Energy-Efficient Sampling Scheme for Networked Control Systems over IEEE 802.15.4 Wireless Networks

This paper proposes a higher energy-efficient mixed sampling scheme (MSE) for networked control systems (NCSs) over IEEE 802.15.4 wireless networks. Compared with some existing periodic event-triggered sampling (ETS) schemes with a delayed sampling estimation, this delay is no longer existing in MSE since there is a dynamic adjustable threshold in MSE to compensate for this delay. Compared with some existing self-triggered sampling (STS)/ETS schemes, MSE does not require continuous measurement of the system states and does not suffer from the conservativeness induced by a self-triggered estimation. By using the proposed MSE, one can improve the energy efficiency in energy-constrained wireless NCSs (WiNCSs) by reducing the number of transmitted packets and increasing the idle-listening period of wireless sensor nodes. An inverted pendulum (Feedback 33-005-PCI) controlled over IEEE 802.15.4 wireless networks is given to demonstrate the effectiveness of the proposed method.