Group control method of spraying flow in pwm intermittent spraying variable spraying system

Abstract

The invention discloses a spraying flow grouping regulation and control method for a PWM intermittent spray type variable spraying system. The system comprises a liquid pesticide box, a diaphragm pump, flow sensors, solenoid valves, spray heads, a variable spraying controller, a sprayer running speed sensor and the like. Spray rods are divided into multiple spray rod partitions, each partition is provided with the spray heads with a certain number, a front end pipeline of each spray head is provided with one solenoid valve in series, and the flow sensors are arranged on main pipelines of the spray rods and branch pipelines of the spray rod partitions in series. Spraying flow calculation models of the spray rod partitions are arranged in the variable spraying controller, target spraying flow of the spray heads and frequency and duty ratios of PWM control signals of the solenoid valves are determined according to operating speeds and set pesticide application amounts of the spray heads, fine adjustment is carried out on the duty ratios of the PWM control signals through a proportional controller, and closed-loop regulation and control are carried out on the overall spraying flow of the spray rod partitions through a PID controller and the flow sensors. The method can be suitable for variable spraying control of pesticide.

Description

technical field [0001] The invention relates to a grouping control method for spraying flow rate of a PWM intermittent spray type variable spraying system, belonging to the field of plant protection machinery, in particular to the field of intelligent control of the working process of a variable rate spraying machine. Background technique [0002] In order to improve the effective utilization rate of pesticides, reduce the loss of pesticides, and improve the control effect, pesticide spraying equipment should spray the required amount of pesticides evenly and accurately to the affected areas according to the specific conditions of crop diseases, insect pests and weeds in each small area of ​​the farmland. That is, the variable is sprayed on the target. Variable target spraying can realize the low-pollution and high-efficiency utilization of pesticides, and it is an important development direction of plant protection machinery and pesticide application technology. The existi...

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Problems solved by technology

[0004] The document "Design and Test of PWM Intermittent Spray Variable Spraying Controller" (Wei Xinhua et al., Journal of Agricultural Machinery, No. 12, 2012, pages 87-93) discloses a PWM intermittent spray variable variable spraying system. The actual spraying flow monitoring system of the spraying boom partitions, but no specific control method is given, and the closed-loop control of the actual spraying flow rate of each nozzle cannot be realized.

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