QoS-based sampling period adjusting method for networked control system

A technology of networked control and sampling period, which is applied in transmission systems, digital transmission systems, data exchange networks, etc., can solve the problems of not considering, adjusting the sampling period, and not fully considering the impact of the sampling period on network service quality, so as to prevent blocking , easy to implement, and reduce data transmission delay and packet loss rate

Inactive Publication Date: 2015-04-01
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

[0005] The existing networked system control methods generally do not fully consider the sampling period and the impact on the network service quality, nor how to actively adjust the sampling period to improve the network service qu...

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  • QoS-based sampling period adjusting method for networked control system
  • QoS-based sampling period adjusting method for networked control system
  • QoS-based sampling period adjusting method for networked control system

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Embodiment Construction

[0024] The method for adjusting the sampling period of the QoS-based networked control system of the present invention is to adjust the sampling period of the system by measuring the QoS of the current network. The method dynamically adjusts the data flow in the network from the perspective of network service quality, which can effectively prevent the occurrence of network congestion, reduce the average transmission delay of the system, and improve the service performance of the network. In the networked control system, this method can effectively improve the stability of the networked control system and the dynamic characteristics of the system.

[0025] The implementation of the present invention will be described in detail below with reference to the accompanying drawings.

[0026] figure 1 It is a structural diagram of a variable sampling networked control system based on QoS. The sampling period adjustment method in the present invention is realized by the network QoS m...

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Abstract

The invention provides a QoS-based sampling period adjusting method for a networked control system. According to the sampling period of the current network QoS adjusting system, the quality of network service (QoS) is improved, and the network average transmission delay and the packet loss probability are reduced, so that the control performance and the stability of the networked control system are improved. The QoS-based sampling period adjusting method for the networked control system includes the steps that a network QoS measurement module measures the communication service condition of the current network, measures the loop delay of data packets in a timestamp mode, and calculates the packet loss probability of the current data packet by carrying out statistics on the transmitting and receiving conditions of the data packets; according to network QoS measure data, a sampling period control module obtains the sampling period which the system should adopt at the moment by the adoption of a static adjustment or dynamic adjustment method.

Description

technical field [0001] The invention relates to a sampling cycle adjustment method of a networked control system based on QoS (Quality of Service), which is especially suitable for networked control with limited network transmission bandwidth, strict requirements for average network delay, and high requirements for system real-time response system and other distributed networked control systems. Background technique [0002] With the emergence of computers, the control system has developed from the original continuous control system to a discrete control system. The computer system can perform accurate and fast calculations and logical judgments, and has good versatility, easy to use, and easy to change the control algorithm. With the above advantages, the computer control system has been developed rapidly. The emergence of Ethernet in 1977 broke the geographical limitation of information transmission, and also made the control system no longer limited to local control. Wi...

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Application Information

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IPC IPC(8): H04L12/26H04L12/851
Inventor 孙健王弟陈杰李牧王钢
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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