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Research of networked control systems with time delay and packet loss

A networked control and time delay technology, applied in general control systems, control/regulation systems, adaptive control, etc., can solve problems such as time delay and data packet loss, and achieve the improvement of time delay and data packet loss problems. Effect

Pending Publication Date: 2022-01-28
XIANGTAN UNIV
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Problems solved by technology

For example, there may be time delays when data is exchanged between devices on a network share
Additionally, packet loss can occur when packets are transmitted from the controller to the actuators over unreliable communication channels

Method used

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  • Research of networked control systems with time delay and packet loss
  • Research of networked control systems with time delay and packet loss
  • Research of networked control systems with time delay and packet loss

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Embodiment Construction

[0012] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0013] Such as figure 1 with figure 2 As shown, the research principle block diagram of the networked control system with time delay and data packet loss proposed by the present invention and the reconstructed networked control system proposed by the present invention, the present invention aims at the randomness in the transmission channel of the networked control system In the case of packet loss and time delay, a novel prediction-based controller design is proposed. Considering both the packet loss compensator and the state predictor, a novel modified model predictive controller is designed. By adopting the toolbox YALMIP, which takes all possible cases into the prediction range, the cost function is transformed into a simultaneous minimum linear matrix inequality with constraints. The specific steps are as follows:

[0014] Step 1: Suppose the networ...

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Abstract

The invention discloses research of a networked control system with time delay and data packet loss. The invention provides a novel controller design based on prediction aiming at the conditions of random data packet loss and time delay in a transmission channel of a networked control system. According to the research, a sequence of data packet loss is simulated as a Bernoulli process, and is compensated by a zero-order holder (ZOH)-based module; a state predictor is used for obtaining the prediction state of a delay time; in consideration of a packet loss compensator and the state predictor, a novel correction model prediction controller is designed and provided; then, a logic programming method is adopted, and all possible conditions are brought into a prediction range; and a cost function is reformed to a synchronous least linear matrix inequality (LMI) with constraints, so that a toolbox YALMIP is employed to ultimately address this minimization of programming problem.

Description

technical field [0001] The invention relates to the field of networked control systems, in particular solving the problems of time delay and data packet loss in the networked control system by using predictive control. Background technique [0002] Over the past few decades, there has been intense interest in the study of networked control systems (NCSs) due to their wide applications in unmanned aerial vehicles, intelligent transportation systems, mobile sensor networks, cloud computing, real-time systems, etc. It is well known that NCSs have various advantages such as: low cost, easy installation and maintenance, and high data exchangeability. [0003] However, unreliable communication networks and limited bandwidth lead to inevitable problems such as time delay and packet loss. Undoubtedly, these factors can greatly degrade the performance of NCSs, and even worse, may generate severe instabilities. For example, time delays may occur when data is exchanged between device...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B13/04
CPCG05B13/042
Inventor 王昭鸿黄佳
Owner XIANGTAN UNIV
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