Investigation of Boom Sprayer Travelling Velocity and Variable Spraying Rate
Date Issued
2012
Date
2012
Author(s)
Li, Chia-Jung
Abstract
The crop production and quality are based on the accurate application rate of chemicals in order to prevent the damage from the pest and disease. The pest will be out of control if the application of pesticide is unsuitable, while it will damage crop, increase cost and cause the environmental pollution. The objective of this research was to develop an automatic sprayer control system. It used a proportional flow control valve to change the flow rate with the speed calibrated by the LabVIEW program. The opening of a proportional flow control valve was to choose to be 20, 34 and 65% with the suggesting values in the previous literature. The flow rate was dependent on the variable operating pressure of a pump and the opening of a proportional flow control valve. The speed showed by the program with the waveform chart in LabVIEW could by analyzed. The variation of the speed with different parameters in program could be found and the speed read from the program could be compared with the actual speed.
The results showed that the application rate would be changed proportional with the operating pressure, but the outlet flow rate controlled by a proportional flow control valve was not satisfied as expected because of the smaller capacity of pump. For example, the flow rate of 20% opening of a proportional flow control valve was close to the flow rate of 100% opening. The value of cycle time in the LabVIEW program was used to count the speed, and it would affect the speed measured by this program, and cause the proportional flow control valve running wrong. For example, the speed read from computer program would be an instantaneously extreme value when the value of cycle was 0.05 second, and the opening of the proportional flow control valve may be 40% not 65% as expected. The speed read from computer program was closer to the actual speed when the value of cycle time was 0.5 second, and it won’t produce the extreme value to affect the running of the proportional flow control valve.
Subjects
precision agriculture
rotary encoder
proportional flow control valve
SDGs
Type
thesis
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