Dynamic matrix control method for networked system having time delay and packet loss

A technology of dynamic matrix control and time delay, applied in the direction of adaptive control, general control system, control/adjustment system, etc., can solve the problems of out-of-order data packets, unprocessed step response coefficient changes, and data packet loss, etc., to achieve The effect of reducing the amount of online calculation

Active Publication Date: 2016-02-24
ZHEJIANG UNIV OF TECH
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Problems solved by technology

[0003] There are mainly the following problems in the networked control system: 1) network delay, because of data retransmission, multi-path transmission, network congestion and other reasons in the communication transmission network, there are almost inevitable network delay problems; 2) packet loss, data Transmission interruption and other reasons will cause the problem of data packet loss; 3) data packets are out of order, and the timing of data packets is disordered due to delay problems
However, the above algorithm does not consider the networked control system that includes time delay, packet loss, and out-of-sequence, especially the impact of out-of-order on the system; and for the change of model parameters caused by time delay, it does not deal with the resulting step response coefficient changing issues

Method used

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  • Dynamic matrix control method for networked system having time delay and packet loss
  • Dynamic matrix control method for networked system having time delay and packet loss
  • Dynamic matrix control method for networked system having time delay and packet loss

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Embodiment Construction

[0042] The present invention will be further described below in conjunction with the accompanying drawings.

[0043] refer to figure 1 and figure 2 , a dynamic matrix control method with time delay and packet loss networked system, comprising the following steps:

[0044] 1) Select the latest control quantity according to the delay sequence

[0045] Denote the time delay from sensor to controller as τ sc , and the time delay from the controller to the actuator is denoted as τ ca , the sensors and actuators are time-driven, and the controller is event-driven, so the time delay τ sc and τ ca Combined, that is, the total delay τ at time k k for:

[0046] τ k =τ sc +τ ca

[0047] The total delay τ at time k k satisfies τ k ∈ N 1 ={0,1,...,d}T, where d is the maximum number of delay cycles, and T is the system sampling period, then the delay sequence that needs to be used to calculate the actual control quantity at time k is:

[0048] τ(k)=[τ k-d+1 ,...,τ k-1 ,τ ...

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Abstract

The invention discloses a dynamic matrix control method for a networked system having time delay and packet loss, comprising steps of choosing updated controlled quantity according to a time delay sequence when the time delay, pack loss and disturbed sequence exist in the same time, obtaining step response coefficients under various time delay through analyzing the time delay and combining with a controlled object model, and designing a controller based on a dynamic matrix control algorithm. The invention provides the dynamic matrix control method for the networked system which can effectively solve the time delay, the pack loss and the disturbed sequence.

Description

technical field [0001] The invention relates to a networked control system and predictive control, in particular to a dynamic matrix control (DMC) method for a networked control system with time delay, packet loss and disorder. Background technique [0002] With the continuous development of computer technology and communication technology, the application field is gradually extended to process control and other fields, and a networked control system is built. Networked control system, with its advantages of easy expansion and maintenance, enhanced system flexibility and reliability, has achieved great success in related fields. The networked control system has the same requirements as the conventional non-networked control system, that is, to ensure the control quality, and the system has good dynamic performance, even if more problems will be introduced after the introduction of the communication transmission network. [0003] There are mainly the following problems in th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B13/04
CPCG05B13/042
Inventor 刘安东季鹏张文安王宏霞俞立
Owner ZHEJIANG UNIV OF TECH
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