Abstract
Real-time controlled pesticide application requires a fast reacting system, enabling continuous variation of pesticide type and concentration based on a control signal. Direct injection systems meet the requirements for such application; however there are significant differences in the response time and quality of single system designs. This article discusses the complex of problems in direct injection systems in connexion with real-time control and proposes optimisations of system parts in order to reduce the response time and improve the quality of the process. The system response time was reduced to 160 ms for 1% output concentration by optimization of the control process, injection assembly and mixing chamber design.
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References
Amsden, R. C. (1970). The metering and dispersing of granules and liquid concentrates. British Crop Protection Council Monograph No, 2, pp. 124–129.
Bartels, P. V. (1988). An experimental study on turbulent mixing of visco-elastic fluids. Dissertation. Delft TU.
Hloben, P. (2007). Study on the response time of direct injection systems for variable rate application of herbicides. Dissertation Bonn, MEG 459, 182 p.
Landers, A. (1999). The theory and constituent parts of a direct injection sprayer. Available at http://www.aben.cornell.edu/extension/pestapp/publications/dir.inj.naac.html, Accessed 27 April, 2007.
Rockwell, A. D., & Ayers, P. D. (1996). A variable rate, direct nozzle injection field sprayer. Applied Engineering in Agriculture, 12(5), 531–538.
Walker, J. T., & Bansal, R. K. (1999). Development and characterization of variable orifice nozzles for spraying agro-chemicals. ASAE Paper No. 99–1008. St. Joseph, MI: ASAE. pp. 2–4.
Zhu, H., Ozkan, H. E., Fox, R. D., Brazee, R. D., & Derksen, R. C. (1998). Mixture uniformity in supply lines and spray patterns of a laboratory injection sprayer. Applied Engineering in Agriculture, 14(3), 223–230.
Acknowledgment
The project was financially supported by the German Science Foundation (DFG) in the Research Training Group (Graduiertenkolleg) 722 “Use of Information Technologies for Precision Crop Protection”.
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Vondricka, J., Schulze Lammers, P. Real-time controlled direct injection system for precision farming. Precision Agric 10, 421–430 (2009). https://doi.org/10.1007/s11119-008-9093-x
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DOI: https://doi.org/10.1007/s11119-008-9093-x