Unmanned aerial vehicle variable spraying control method, control system and unmanned aerial vehicle

Abstract

The invention provides a control method, a control system and an unmanned aerial vehicle for variable spraying of drones, and relates to the technical field of agricultural machinery. The spraying pulse width is adjusted through the pulse width PWM of the control system, thereby realizing variable spraying. Before spraying, the pesticide and solvent are mixed in the spray box, and a solenoid valve is installed at the liquid outlet of the spray box. The flow rate of the nozzle is regulated by the intermittent opening and closing of the solenoid valve, and the change of the flow rate is controlled by the duty cycle of the system. Under the condition of keeping the spraying pressure constant, a wide range of variable control can be realized, and the droplet index changes little, and the flow rate response speed is faster than the traditional adjustment method based on pressure changes.

Description

technical field [0001] The invention relates to the technical field of agricultural machinery, in particular to a control method, a control system and a drone for variable spraying of drones. Background technique [0002] As a large agricultural country, my country has nearly 150 million hm2 of basic farmland. The prevention and control of agricultural diseases and insect pests is still the key content of agricultural production. It is the basis for ensuring high-yield and high-quality agriculture and realizing the sustainable development of agricultural economy. Compared with developed countries, my country's plant protection machinery is still relatively backward. At present, the use of manual pesticide spraying machinery and backpack motorized pesticide machinery accounts for about 93.07% and 5.53% of the domestic plant protection machinery respectively. Plant protection operations require a lot of labor and labor intensity. , It is easy to cause environmental pollution, a...

AI Technical Summary

Problems solved by technology

However, in fact, it is still difficult to see the scene where drones can really work in a large area for a long time

There are many difficulties in the promotion and application of plant protection drones

At the same time, when my country is currently using plant protection drones for pesticide atomization and spraying, there are phenomena such as large, uneven, poor targeting, and poor deposition of droplets on the crop canopy, which affects the control effect.

[0004] At present, relevant domestic scientific research institutes, universities, and enterprises are all striving to carry out in-depth research on the aerial spraying technology of plant protection drones, and have made some progress. However, compared with developed countries, my country's agricultural aviation technology development It is still in the development stage, especially for the dynamic control system of the liquid pump in the spraying system of the multi-rotor plant protection UAV.

[0005] The traditional variable-variable pesticide spraying adopts the method of controlling the flow rate by pressure, so the change of the flow rate needs to change the pressure within a certain range, and the change of the pressure will inevitably lead to the change of the spray particle size, resulting in the instability of the spraying

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