A Communication System for Hierarchical Distribution Control of Large-scale Variable Sprinkler

A technology of hierarchical distribution and communication system, which is applied in the field of communication system for hierarchical distribution control of large-scale variable sprinkler irrigation machines. It can solve the problems that communication quality affects the accuracy of PWM variable sprinkler irrigation control, and it is impossible to use the whole wired communication control method, so as to achieve low cost and low cost. The effect of high power consumption and high reliability

Active Publication Date: 2021-08-06
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the above-mentioned defects in the prior art, the technical problem to be solved by the present invention is that, in the pivot rotary large-scale sprinkler irrigation machine, since the slip ring digital communication cannot be used, the whole-process wired communication control mode cannot be adopted; Wireless communication control mode, when the span number and span length increase, the decrease of communication quality will affect the control accuracy of PWM variable sprinkler irrigation

Method used

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  • A Communication System for Hierarchical Distribution Control of Large-scale Variable Sprinkler
  • A Communication System for Hierarchical Distribution Control of Large-scale Variable Sprinkler

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Embodiment 1

[0026] figure 1 It is a control connection schematic diagram of a preferred embodiment of a communication system for hierarchical distribution control of large-scale variable sprinkler irrigation proposed by the present invention. like figure 1 As shown, this embodiment includes a master controller 1, a master wireless data transmission terminal 3, a slave wireless data transmission terminal 4, an RS485 repeater 5 and a wired RS485 bus. Among them, multiple tower truck controllers can be mounted on the wired RS485 bus, figure 1 Only two of them are marked in , which are the tower car controller 21 and the tower car controller 22.

[0027] Wherein, the wired interface of the main wireless data transmission terminal 3 is in the form of RS232 or RS485, and the main wireless data transmission terminal 3 is connected to the corresponding RS232 or RS485 port on the main controller 1 through a wired communication connection.

[0028] The communication interface from the wired inte...

Embodiment 2

[0033] like figure 2 As shown, three tower car controllers 21, 22, 23 are included in this embodiment. figure 2 The middle is a schematic diagram of the position of the control device of this embodiment. On the large-scale PWM variable sprinkler, the water inlet pipe 71 is fixed on the bracket and connected with the main water pipe 72 . During the working process, three tower trucks 81, 82, 83 drive the main water pipe 72 to rotate around the support main shaft 6. In such a working mode, if the main controller 1 and the tower truck controllers 21, 22, 23 adopt the whole-process wired communication mode, the communication lines arranged along the water inlet pipe 71 and the main water pipe 72 need to be wound around the main axis of rotation. After the number of turns increases, it is easy to cause disconnection, and the communication line and the low-voltage control line are not suitable for solving this problem by adding slip rings, so the whole process of wired communica...

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Abstract

The invention discloses a communication system for hierarchical distribution control of large-scale variable sprinkler irrigation machines, including a master controller, a master wireless data transmission terminal, a slave wireless data transmission terminal, a wired communication bus, and a wired communication repeater. The wireless data transmission terminal is connected to the main wireless data transmission terminal by wired communication, the wireless data transmission terminal is connected to the wired communication repeater by wired communication, and the wired communication repeater is connected to the wired communication repeater. The wired communication buses are connected by wired communication, and the master wireless data transmission terminal and the slave wireless data transmission terminal are connected by wireless communication. The invention not only solves the problem that the large-scale variable sprinkler irrigation machine cannot adopt the whole-process wired communication system, but also solves the problem that the communication quality decreases due to the increase of the number of spans and the span length of the wireless networking.

Description

technical field [0001] The invention relates to the field of industrial automation communication, in particular to a communication system for hierarchical distribution control of large-scale variable sprinkler irrigation machines. Background technique [0002] Pulse Width Modulation (PWM) variable sprinkler irrigation refers to the installation of water valves in front of each nozzle of the sprinkler irrigation machine, and the precise control of the irrigation volume by adjusting the duty cycle of the water valve in an opening and closing cycle, which can realize walking and truss in two directions. variable irrigation. Due to the large number of water valves and the large layout span, large-scale variable sprinkler irrigation machines often adopt a hierarchical distribution control method, that is, the main controller and the tower car controller on each tower car are set, and each water valve is assigned to the corresponding tower car for control according to its location...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A01G25/02A01G25/16G08C17/02H04L12/40H04W4/42H04W4/80H04W84/22
CPCA01G25/02A01G25/16G08C17/02H04L12/40013H04L2012/40228H04L2012/40267H04W84/22H04W4/42H04W4/80
Inventor 陶帅李文涛李彦明刘成良莫锦秋
Owner SHANGHAI JIAOTONG UNIV
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