Air mass

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 6
 
  flujo de aire en vehiculos
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  Air mass sensor The sensor of the air mass is used to determine the intake air mass. It comprises ahousing shaped tube with a rectifier, protection of the sensor and a sensor module screwed on the outside.It is mounted in the suction pipe between the air filter housing and the intake manifold. In the airstream two metal film resistors which are temperature dependent and are placed on a glass membrane they are. The first resistor (RT) is a temperature sensor and measured air temperature. The second resistor (RS) is used to record the airflow. Depending on the amount of intake air, resistor RS is cooled more or less. To match the constant temperature difference between the resistance RT and RS, the current flow through resistor RS must be dynamically regulated by electronics. This filament current seres as measurement for the corresponding air mass being sucked by the engine. This alue is re!uired by the control unit of engine control system to calculate the amount of fuel needed.  defect air mass sensor is e#pressed as follows$ay%an engine shutdown or system control unit &ngine control occurs continues to workon a program of emergency operationIllumination of motor control  breakdown of the air mass sensor may be due to one of the following causes%'ontact failures in the electrical connectionseasuring elements damagedmechanical damage (ibration, accident)Deiation of the measuring elements (output R)During troubleshooting, the following steps should be considered%'heck that the plug connection is properly seated and performs the proper contact 'heck whether the air mass sensor is damaged 'heck if the measuring elements are damaged   'heck the supply oltage with the ignition on (scheme necessary for the occupation of pins connections). Theoretical alue% *.+ to - .'heck the output oltage with the engine running (scheme necessary for the occupation of pins connections). Theoretical alue% / 0 + .'heck the passage of the connecting pipes between the connector unit e#tracted control and the sensor connector (scheme necessary for the occupation of pins connections). Theoric alue%appro#. / ohmselectronic check air mass sensor by the control unit of the control system of the engine. ppearing a fault, a fault code on the control unit that can be read with a diagnostic kit will be stored.   TRADUCCION Sensor de masa de aire &l sensor de la masa de aire sire para determinar la masa de aire aspirada. &st1 compuesto por una carcasa en forma de tubo con un rectificador de corriente, una protecci2n del sensor y un m2dulo de sensor atornillado en la parte e#terna. Se monta en el tubo de aspiraci2n entre la carcasa del filtro de aire y el colector deaspiraci2n. &n la corriente de aire se hallan dos resistencias de pel3cula met1lica !ue dependen de la temperatura y !ue est1n colocadas sobre una membrana de cristal. 4a primera resistencia (RT) es un sensor de temperatura y mide la temperatura del aire. 4a segunda resistencia (RS) sire para registrar el caudal de aire. &n funci2n de la cantidad de aire aspirada, la resistencia RS se enfr3a m1s o menos. 5ara igualar la diferencia constante de temperatura entre la resistencia RT y la RS, el flu6o de corriente a tra7s de la resistencia RS deber1 ser regulado din1micamente por la electr2nica. &sta corriente de filamento sire como medici2n para la correspondiente masa de aire !ue es aspirada por el motor. &ste alor es re!uerido por la unidad de control del sistema de control del motor para calcular la cantidad de combustible necesaria.8n defecto del sensor de masa de aire se manifiesta de la siguienteanera%Se produce un paro del motor o la unidad de control del sistema de control del motor contin9a traba6ando en un programa de funcionamiento de emergenciaIluminaci2n del testigo de control del motor 8na aer3a del sensor de masa de aire puede deberse a una de las siguientes causas%allos de contacto en las cone#iones el7ctricas&lementos de medici2n da:adosDa:os mec1nicos (ibraciones, accidente)Desiaci2n de los elementos de medici2n (salida del marco de medici2n)Durante la locali;aci2n de aer3as, deber3an considerarse los siguientes pasos%  'omprobar !ue la cone#i2n de enchufe est1 bien asentada y !ue reali;a el contacto correctamente 'omprobar si el sensor de masa de aire presenta da:os 'omprobar si los elementos de medici2n presentan da:os 'omprobar el suministro de tensi2n con el encendido conectado (es!uema de cone#iones necesario para la ocupaci2n de los pins). alor te2rico% *,+ < - .'omprobar la tensi2n de salida con el motor en marcha (es!uema de cone#iones necesario para la ocupaci2n de los pins). alor te2rico% / < + .'omprobar el paso de las tuber3as de cone#i2n entre el conector de la unidad de control e#tra3do y el conector del sensor (es!uema de cone#iones necesario para la ocupaci2n de los pins). alor te2rico%apro#. / ohmios'omprobaci2n electr2nica del sensor de masa de aire mediante la unidad de control del sistema de control del motor. l aparecer un fallo, se almacenar1 un c2digo de aer3a en la unidad de control !ue podr1 leerse con un e!uipo de diagn2stico.
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