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dc.contributor.authorAntuniassi, Ulisses Rocha [UNESP]
dc.contributor.authorFigueiredo, Z. N.
dc.contributor.authorde Carvalho, WPA
dc.contributor.authorPinto, D. R.
dc.date.accessioned2014-05-20T13:19:19Z
dc.date.available2014-05-20T13:19:19Z
dc.date.issued2001-01-01
dc.identifier.citationProceedings of the World Congress of Computers In Agriculture and Natural Resources. St Joseph: Amer Soc Agr Engineers, p. 272-278, 2001.
dc.identifier.urihttp://hdl.handle.net/11449/5043
dc.description.abstractThe aim of this study was to develop a laboratory method for time response evaluation on electronically controlled spray equipment using Programmable Logic Controllers (PLCs). For that purpose, a PLC controlled digital drive inverter was set up to drive an asynchronous electric motor linked to a centrifugal pump on a experimental sprayer equipped with electronic flow control. The PLC was operated via RS232 serial communication from a PC computer. A user program was written to control de motor by adjusting the following system variables, all related to the motor speed: time stopped; ramp up and ramp down times, time running at a given constant speed and ramp down time to stop the motor. This set up was used in conjunction with a data acquisition system to perform laboratory tests with an electronically controlled sprayer. Time response for pressure stabilization was measured while changing the pump speed by +/-20%. The results showed that for a 0.2 s ramp time increasing the motor speed, as an example, an AgLogix Flow Control system (Midwest Technologies Inc.) took 22 s in average to readjust the pressure. When decreasing the motor speed, this time response was down to 8 s. General results also showed that this kind of methodology could make easier the definition of standards for tests on electronically controlled application equipment.en
dc.format.extent272-278
dc.language.isoeng
dc.publisherAmer Soc Agr Engineers
dc.relation.ispartofProceedings of the World Congress of Computers In Agriculture and Natural Resources
dc.sourceWeb of Science
dc.subjectprecision agriculturept
dc.subjectinstrumentation and controlpt
dc.subjectequipment automationpt
dc.titlePerformance evaluation on electronic control systemsfor field sprayers using programmable logic controllersen
dc.typeTrabalho apresentado em evento
dcterms.rightsHolderAmer Soc Agr Engineers
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)
dc.description.affiliationUniv Estadual Paulista Julio Mesquita Filho, Rural Engn Dept, BR-18603970 Botucatu, SP, Brazil
dc.description.affiliationUnespUniv Estadual Paulista Julio Mesquita Filho, Rural Engn Dept, BR-18603970 Botucatu, SP, Brazil
dc.identifier.wosWOS:000185357400039
dc.rights.accessRightsAcesso aberto
unesp.campusUniversidade Estadual Paulista (UNESP), Faculdade de Ciências Agronômicas, Botucatupt
dc.identifier.lattes9754851029548502
unesp.author.lattes9754851029548502
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