Event-triggered networked control system encoder and its encoding method
A networked control and event-triggered technology, applied in the field of networked control, can solve problems such as system instability, loss, transmission rate cannot increase channel capacity, etc., and achieve the effect of reducing the requirement and minimizing the data transmission rate
Inactive Publication Date: 2020-04-07
SHENYANG LIGONG UNIV
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Problems solved by technology
The transmission rate required to complete real-time data transmission often exceeds the channel capacity of the network communication channel, which often leads to problems such as data packet transmission delay, loss, and out-of-sequence. In severe cases, the network is paralyzed, greatly reducing system control performance, and even causing system instability
Therefore, there is an upper limit on the data transmission rate, that is, the transmission rate cannot be greater than the channel capacity
Method used
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[0022] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.
[0023] networked control systems, such as figure 1 As shown, it mainly includes the controlled object, sensor, encoder, decoder, controller, actuator, communication network and other parts. This embodiment provides an event-triggered networked control system encoder, which is mainly suitable for networked control systems, especially for complex control systems with a large number of sensors. The sensor and the controller are connected through a wireless digital communication network, which can reduce system cost and facilitate maintenance.
[0024] The state equation of a linear time-invariant control system is expressed as:
[0025]
[0026] C t =FS t
[0027] Am...
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The invention provides a networked control system coder based on event triggering and a coding method thereof and relates to the technical field of networked control. The coder comprises a system state coordinate conversion circuit, a data sample holder, an analog to digital converter and a digital signal processor which are connected in sequence. A software function module for processing an integrated signal in the digital signal processor comprises a digital filter module, an event trigger module, a quantization coding module, a data packet generation module and a transmission rate calculation module. Coordinate conversion for a system state is carried out, then quantization coding is carried out, and the relation degree among state variables is eliminated to the greatest extent. An event for judging quantization coding trigging time is a system performance change over-bound event or a transmission rate over-speed event. Only when the triggering event occurs, the quantization coding can be carried out, data is transmitted, and the transmission rate is minimized. The demand for a network communication bandwidth can be greatly reduced, and moreover, a given system control performance index demand can be guaranteed to be achieved.
Description
technical field [0001] The invention relates to the technical field of networked control, in particular to an event-triggered networked control system encoder and an encoding method thereof. Background technique [0002] With the continuous integration of technologies such as informatization, networking, and industrial automation, and mutual promotion of development, networked control technology has received more and more attention, gradually formed, and is widely used in various production links such as industry, agriculture, and national defense. [0003] In a networked control system, sensors and controllers are separated in space and connected through a wireless communication network, such as unmanned aerial vehicles, unmanned water craft or unmanned land vehicles. The system parameters measured by the sensor need to be quantified, coded, and wirelessly transmitted in space by means of digital communication. The encoder used in the control system must be able to adapt t...
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IPC IPC(8): H04L1/00
CPCH04L1/0002
Inventor 刘庆泉
Owner SHENYANG LIGONG UNIV