<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0187-7380</journal-id>
<journal-title><![CDATA[Revista fitotecnia mexicana]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. fitotec. mex]]></abbrev-journal-title>
<issn>0187-7380</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de Fitogenética A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0187-73802023000400439</article-id>
<article-id pub-id-type="doi">10.35196/rfm.2023.4.439</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Sistema mecatrónico para controlar el dosificador de semilla y presión de vacío de una sembradora-fertilizadora]]></article-title>
<article-title xml:lang="en"><![CDATA[Mechatronic system for controlling the seed dispenser and vacuum pressure of a planter-fertilizer]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Torres-Sandoval]]></surname>
<given-names><![CDATA[Julio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Romantchik-Kriuchkova]]></surname>
<given-names><![CDATA[Eugenio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López-Cruz]]></surname>
<given-names><![CDATA[Irineo L.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López Canteñs]]></surname>
<given-names><![CDATA[Gilberto de J.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias  ]]></institution>
<addr-line><![CDATA[Texcoco Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Autónoma Chapingo  ]]></institution>
<addr-line><![CDATA[Texcoco Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2023</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2023</year>
</pub-date>
<volume>46</volume>
<numero>4</numero>
<fpage>439</fpage>
<lpage>449</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-73802023000400439&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-73802023000400439&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-73802023000400439&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Los dosificadores de semilla de las sembradoras son componentes que determinan en gran medida la calidad de siembra; de manera general, éstos son accionados por un sistema de transmisión mecánica-rueda motriz, los cuales tienen el inconveniente de ser afectados en su funcionamiento por las condiciones del suelo, cubierta vegetal y velocidad de siembra, que influyen en el deslizamiento de la rueda motriz o provocan vibraciones y bloqueos del sistema de transmisión ocasionando mala calidad de siembra. Las sembradoras más avanzadas utilizan sistemas mecatrónicos que eliminan estos problemas. En el presente trabajo se desarrolló un sistema mecatrónico para controlar la frecuencia de rotación del disco semillero y presión de vacío del dosificador de semilla, el cual se adaptó y probó en una sembradora-fertilizadora neumática. El sistema está basado en microcontroladores para manejar la densidad de siembra mediante cambios en la frecuencia de rotación del disco semillero accionado por un motorreductor, utilizando la técnica Modulación por Ancho de Pulso (PWM por sus siglas en inglés) y control Proporcional-Integral-Derivativo (PID). Con un método similar se controla la presión de vacío mediante un servomotor que ajusta la apertura de una compuerta en la línea de succión de la turbina. Con el sistema desarrollado se logró alcanzar la dosis de siembra deseada en aproximadamente 1.5 s con un error de control en estado estable de ± 5 % a frecuencias de rotación del disco semillero de 21, 53 y 70 r/min y presiones de vacío de 1.5 a 4 kPa. Con presión de vacío de 5 kPa o frecuencia de rotación del disco semillero de 37 r/min el error se incrementa a ± 10 %, y para 5 r/min a ± 20 %. El error de control de la presión de vacío fue de ± 10 % para presiones de 1.5 a 5 kPa. Se logró desarrollar un sistema mecatrónico eficiente para controlar el sistema neumático dosificador de semilla.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Summary Seed dispensers of the seeders are components that largely determine the quality of planting; in general, these are driven by a mechanical transmission-drive wheel system, which has the drawback of being affected in its operation by soil conditions, vegetation cover and planting speed, which influence the sliding of the drive wheel or cause vibrations and blockages of the transmission system causing poor planting quality. The most advanced seeders use mechatronic systems that eliminate these problems. In the present work a mechatronic system was developed to control the rotation frequency of the seed disc and vacuum pressure of the seed dispenser, which was adapted and tested in a pneumatic seeder-fertilizer. The system is based on microcontrollers to manage planting density by changing the rotation frequency of the seed disk driven by a geared motor, using the Pulse-Width Modulator (PWM) technique and the Proportional-Integral-Derivative (PID) control. A similar method controls the vacuum pressure by means of a servo motor that adjusts the opening of a gate in the turbine suction line. With the developed system it was possible to reach the desired planting dose in approximately 1.5 s with a control error in steady state of ± 5 % at rotation frequencies of the seed disc of 21,53 and 70 r/min and vacuum pressures of 1.5 to 4 kPa. At vacuum pressures of 5 kPa or seed disc rotation frequency of 37 r/min the error increases to ± 10 %, and for 5 r/min to ± 20 %. The vacuum pressure control error was ± 10 % for pressures from 1.5 to 5 kPa. An efficient mechatronic system was developed to control the pneumatic seed dosing system.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Control PI y PID]]></kwd>
<kwd lng="es"><![CDATA[dosificador de semilla]]></kwd>
<kwd lng="es"><![CDATA[microcontrolador]]></kwd>
<kwd lng="es"><![CDATA[PWM]]></kwd>
<kwd lng="en"><![CDATA[Microcontroller]]></kwd>
<kwd lng="en"><![CDATA[PI and PID control]]></kwd>
<kwd lng="en"><![CDATA[PWM]]></kwd>
<kwd lng="en"><![CDATA[seed dispenser device]]></kwd>
</kwd-group>
</article-meta>
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