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GPS-based unmanned aerial vehicle variable-rate spraying control device and method

A technology of unmanned aerial vehicles and flight control, which is applied in the field of variable control and agricultural aviation plant protection machinery and equipment. It can solve the problems of difficult operation, complicated process, and difficulty in obtaining good spray effects, and achieve stable spray width and droplet size. uniform effect

Inactive Publication Date: 2017-10-20
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In recent years, with the rapid development of modern agriculture and high-tech, variable spraying technologies mainly include variable spraying methods based on infrared, ultrasonic, machine vision and laser radar. Difficult to achieve good spray effect in practical application

Method used

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  • GPS-based unmanned aerial vehicle variable-rate spraying control device and method
  • GPS-based unmanned aerial vehicle variable-rate spraying control device and method
  • GPS-based unmanned aerial vehicle variable-rate spraying control device and method

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Embodiment

[0077] Such as figure 1 As shown, in this embodiment, the operator controls the unmanned aerial vehicle to fly at a height of 1-3m from the top of the crop in the operation area through the ground control station. The spray device obtains the flight speed of the UAV through the GPS module 1 and sends it to the primary and secondary controllers for processing. The secondary controller outputs PWM control signals with different duty ratios according to different speed values, and the signals are transmitted to the PWM control module. The control module converts the PWM duty cycle signal into the corresponding diaphragm pump input voltage signal, thereby controlling the change of the speed of the diaphragm pump 6 to provide a variable spray pressure, and finally delivers the liquid medicine to the centrifugal atomizing nozzle to achieve variable spray. During the period, the flow sensor detects the flow value of the nozzle in real time and feeds it back to the single-chip microco...

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Abstract

The invention discloses a GPS-based unmanned aerial vehicle variable-rate spraying control device and method. The device comprises a flight control subsystem, a sensing acquisition subsystem, a flow control subsystem and a power supply module. The sensing acquisition subsystem is connected with the flight control subsystem and the flow control subsystem separately. The power supply module supplies power for the flight control subsystem, the sensing acquisition subsystem and the flow control subsystem. The method is implemented in a way that the flow values corresponding to flight speeds are taken as the given values through an integral separation PID control strategy, then a single chip microcomputer outputs corresponding PWM signals to change the rotation speeds of a diaphragm pump, and thus the flows are changed; and the PID control strategy refers to that the flows of nozzles are detected by flow sensors, the process variables and the set values are constantly compared, and the flow of the pump is constantly corrected and controlled, so as to improve the control precision. The PWM technology is adopted to adjust the diaphragm pump, to realize the control that the flows change along with the speeds, and an intelligent variable-rate spraying control system high in efficiency, good in stability and low in cost is formed.

Description

technical field [0001] The invention relates to the research field of agricultural aviation plant protection machinery equipment and variable control technology, in particular to a GPS-based variable spray control device and method for an unmanned aerial vehicle. Background technique [0002] Variable-variable spraying is an important way to realize precision pesticide application technology in the field of agricultural aviation. The variable spray technology can automatically adjust the spray volume according to the operation speed, crop density and pest damage degree, which not only saves pesticides, but also reduces pesticide residues in agricultural products and environmental pollution. It is an important development direction of pesticide application technology. Variable spray application can be realized by changing spray time, spray pressure and liquid concentration. PWM technology to adjust the water pump to achieve flow control is a method of variable spray time. Co...

Claims

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Application Information

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IPC IPC(8): B64D1/18B05B12/08G05D1/10
CPCB05B12/085B64D1/18G05D1/101
Inventor 岳学军王林惠刘永鑫王健凌康杰甘海明王举汪锋周志清胡俊生岑振钊李政荣
Owner SOUTH CHINA AGRI UNIV
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