Lección 2: Inyección Unitaria Electrónica (EUI)
Introducción
Esta lección presenta el sistema de combustible de Inyección Unitaria Electrónica (EUI). En un esfuerzo continuo por suministrar óptimo rendimiento y economía de combustible y, al mismo tiempo, cumplir con las regulaciones de emisiones, Caterpillar usa el sistema de combustible EUI en los siguientes motores: 3176 (introducido en 1988) 3406E y 3176B (introducido en 1993) C-10 (3176C) (Introducido en 1995) C-12 (3196) (introducido en 1995) 3500B (introducido en 1995) 3456 (introducido en 1998) Objetivos
Al terminar esta unidad, el estudiante podrá: • Identificar los componentes del sistema de combustible EUI • Explicar la operación del sistema de combustible EUI • Quitar e instalar el inyector EUI Materiales de referencia
CD-ROM del Sistema de Combustible EUI Caterpillar (en los modelos de motor C-10, C-12, 3176C, 3196 y 3406E) RENR1391 Diagrama eléctrico relacionado con el vehículo y el motor usados en las prácticas Herramientas
22222 2-78 7876 76
(168-0 (168 -038 382) 2) Ju Jueg egoo de he herr rram amie ient ntas as Ca Cate terp rpil illa larr o su equivalente
Herramientas para quitar e instalar el inyector del motor usado en las prácticas de taller (consulte el Manual de Desarmado y Armado apropiado).
) I U E ( a c i n ó r t c e l E a i r a t i n U n ó i c c e y n I : 2 n ó i c c e L
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Unidad 2 Lección 2
2-2-2
Sistemas Electrónicos de la Máquina
Figura 2.2.1 Sistema de Combustible EUI Caterpillar (camiones de carretera)
El Sistema de Combustible EUI Caterpillar es de control electrónico. La bomba de inyección, las tuberías de combustible y los inyectores usados en los motores mecánicos se reemplazaron por un inyector unitario electrónico en cada cilindro. Un solenoide en cada inyector controla la cantidad de combustible que suministra el inyector. Un Módulo de Control Electrónico (ECM) envía una señal a cada solenoide del inyector, que controla la cantidad de combustible inyectado en cada cilindro. Los componentes principales del sistema EUI incluyen el ECM, los inyectores EUI, el mazo de cables, los sensores y los interruptores. El sistema de combustible EUI también incluye un sistema de suministro de combustible de presión baja, controlado mecánicamente, que envía combustible a los inyectores. El sistema de combustible de presión baja consta del tanque de combustible, la bomba de transferencia de combustible, filtros de combustible
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Unidad 2 Lección 2
2-2-3
Sistemas Electrónicos de la Máquina
Fig. 2.2.2 2.2.2 ECM del Motor 3406E
El cerebro del motor electrónico es el ECM. El ECM funciona como regulador y computadora del sistema de combustible. El ECM recibe todas las señales provenientes de los sensores y activa los solenoides del inyector para controlar la sincronización y la velocidad del motor.
Fig. 2.2.3 Funciones del ECM
El ECM tiene tres funciones básicas: -
Suminis Sumi nistra tra ener energía gía a compo component nentes, es, sens sensore oress e iny inyect ectores ores
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Unidad 2 Lección 2
2-2-4
Sistemas Electrónicos de la Máquina
Fig. 2.2.4 Módulo de Personalidad (motores EUI de modelos anteriores)
Los ECM del motor tienen un Módulo de Personalidad que puede ser reemplazable, como en el caso de los motores EUI de modelos anteriores (vea la figura) o usando solamente programación Flash, como en los motores recientes. El módulo de personalidad contiene el software con toda la información de configuración del sistema de combustible (como la potencia, la elevación de par y las tasas de relación de combustible) que determina el rendimiento del motor. La programación Flash es el único método usado para actualizar el software en la mayoría de los motores. Este método requiere reprogramación electrónica (instalación del archivo Flash) del software del Módulo de Personalidad. Sin este archivo Flash, el ET Cat no podría comunicarse con el ECM, y el motor no arrancaría.
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Unidad 2 Lección 2
2-2-5
Sistemas Electrónicos de la Máquina
Fig. 2.2.5 Componentes del suministro de energía al ECM
La batería de 24 voltios del motor suministra la energía al ECM y al sistema. Los principales componentes de este circuito son: -
Batería
-
Inte In terr rrup upto torr de la la llav llavee de arr arran anqu quee
-
Rellé pri Re princ ncip ipal al de en ener ergí gíaa
-
Disy Di syun unttor de 15 am ampe peri rios os
-
Perno a tierra
-
Conector del ECM
-
Cone Co nect ctor or de de int inter erfa fazz de la má máqu quin inaa
Si el voltaje de suministro excede los 32,5 voltios o es menor que 9,0 voltios, se registra un código de diagnóstico. (Vea la Guía de localización y solución de problemas para detalles completos sobre registros de sucesos de voltaje). El ECM suministra energía a los inyectores (105 voltios), a los sensores analógicos (5 voltios) y a los sensores digitales (8 voltios). NOTA: El ECM debe tener voltaje de suministro NOTA: suministro para que el motor arranqu arranque. e. Así mismo, si el voltaje del arranque arranque está por debajo de 7 voltios, el motor motor no arrancará. arrancará.
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Unidad 2 Lección 2
2-2-6
Sistemas Electrónicos de la Máquina
MAZO DE CABLES DEL MOTOR
6 IMPULSORES
3 RETORNOS J2 ECM J1
SENSOR DE SINCRONIZACIÓN/VELOCIDAD ALTA
SENSOR DE SINCRONIZACIÓN/ VELOCIDAD DE ARRANQUE
CONECTOR DE CALIBRACI ÓN DE SINCRONIZACIÓN
PERNO A TIERRA
SENSOR DE TEMPERATURA DE REFRIGERANTE CONECTOR INTERFAZ DEL VEHÍ CULO CULO
SENSOR DE TEMPERATURA DE COMBUSTIBLE SENSOR DE TEMPERATURA DE AIRE DE ADMISI ÓN
SENSOR DE PRESI ÓN DE ACEITE
SENSOR DE PRESIÓN ATMOSFÉRICA SENSOR DE PRESIÓN DE SALIDA DEL TURBO
Fig. 2.2.6 Componentes del mazo de cables del motor
Este diagrama identifica los componentes externos instalados del motor electrónico EUI. Los componentes de entrada que se pueden encontrar en otros motores EUI son: -
Sensor de temp Sensor tempera eratur turaa de comb combust ustibl iblee del del motor motor Sensor Sens or de tem temper peratu atura ra del del aire aire amb ambien iente te Sensor Sens or del del nivel nivel de refr refrige igeran rante te del del moto motorr Interrup Inte rruptor tor de de flujo flujo del del refrig refrigera erante nte del del motor motor
Fig. 2.2.7 Componente del mazo de cables del vehículo con motor EUI
Este diagrama identifica los componentes instalados en el vehículo.
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Unidad 2 Lección 2
2-2-7
Sistemas Electrónicos de la Máquina
Fig. 2.2.8 2.2.8 Sensor de posición posición del acelerador acelerador
El Sensor de Posición del Acelerador (flecha) se encuentra en el pedal del acelerador y se usa para indicar la velocidad deseada del motor desde el operador hasta el ECM, en forma electrónica. El sensor recibe 8 voltios desde el suministro de energía del sensor digital en el ECM. La salida del sensor de posición del acelerador es una señal de Modulación de Duración de Impulsos (PWM) de frecuencia constante para el ECM. No existe ninguna conexión mecánica entre el pedal y el ECM (regulador).
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Unidad 2 Lección 2
2-2-8
Sistemas Electrónicos de la Máquina
Fig. 2.2.9 Sensores de velocidad/sincronización (motor 3406E)
Los sensores de velocidad/sincronización del motor son sensores magnéticos que suministran una frecuencia directamente proporcional a la velocidad del motor. Los sensores de velocidad/sincronización velocidad/sincronización producen una salida del ciclo de trabajo, que indica la posición del cigüeñal al ECM. Los sensores de velocidad/sincronización están detrás de la cubierta de los engranajes de sincronización. Los sensores que se muestran aquí son el sensor de velocidad alta en la parte superior y el sensor del cigüeñal (velocidad baja) en la parte inferior. Los sensores de velocidad/sincronización cumplen tres funciones básicas en el sistema: - Detec Detectar tar la velocidad velocidad del motor motor - Detec Detectar tar la sincronizac sincronización ión del motor - Identificar del número del cilindro cilindro del centro muerto superior Los sensores de velocidad/sincronización se instalan en la parte de atrás de la caja delantera, por debajo de la rueda de engranajes de
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Unidad 2 Lección 2
2-2-9
Sistemas Electrónicos de la Máquina
Si se reemplaza el ECM o se realizó trabajo en el tren de impulsión del motor, los sensores de velocidad/sincronización requerirán calibración. Consulte el Manual de Servicio apropiado del motor, para determinar si se necesita calibración. La calibración del sensor de velocidad/sincronización mejora la exactitud de inyección de combustible y corrigen cualquier tolerancia leve entre el cigüeñal, los engranajes de sincronización y las instalaciones del sensor de velocidad/sincronización. NOTA: El ECM debe enviar NOTA: enviar una señal de velocidad/sincr velocida d/sincronización onización para activar los inyectores. inyectores. Sin una señal de velocidad/sincron velocidad/sincronización, ización, el motor no arrancará. arrancará.
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Unidad 2 Lección 2
2-2-10
Sistemas Electrónicos de la Máquina
2
1
Fig. 2.2.10 Sensor Sensores es del del motor motor EUI (Motor 3406E)
El sensor de presión de la salida del turbocompresor o el de refuerzo (1) es un sensor analógico de tres cables, que mide la presión absoluta corriente abajo del posenfriador. El ECM suministra 5 voltios al sensor de refuerzo. La presión de refuerzo (manómetro) se puede leer con las herramientas de servicio. Esta medición se calcula usando la presión atmosférica y los sensores de presión de salida del turbocompresor. Una falla de este sensor hará que el ECM reduzca la energía hasta 60% cuando el ECM falle hasta una condición de refuerzo cero. La función principal del sensor es activar el Control de relación de Combustible, lo que reduce el humo, las emisiones, y mantiene la respuesta del motor durante la aceleración. El sistema utiliza la presión de refuerzo, la presión atmosférica y la velocidad del motor para controlar la relación de combustible. El ajuste del control de relación de combustible no es ajustable en las aplicaciones de la máquina 3406E.
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Unidad 2 Lección 2
2-2-11
Sistemas Electrónicos de la Máquina
Fig. 2.2.11 2.2.11 Sensor de presión atmosférica atmosférica (Motor (Motor 3406E)
El sensor de presión atmosférica (flecha) está instalado en el bloque y tiene descarga a la atmósfera en el motor. El ECM suministra 5 voltios al sensor analógico de tres cables. El sensor de presión atmosférica mide la presión atmosférica, para suministrar una referencia de altura en la compensación automática de la altura. Todos los sensores de presión del sistema miden la presión absoluta y, por lo tanto, requieren que el sensor atmosférico calcule la presión del manómetro. Los sensores se usan individualmente (presión absoluta) en el caso de la presión atmosférica y, como un par, para calcular las presiones del aceite y del reforzador (presiones del manómetro). Todas las salidas del sensor de presión se emparejan con la salida del sensor de presión atmosférica durante la calibración. La calibración se puede lograr usando usando la herramienta herramienta de servicio servicio ET Cat o accionando el interruptor de la llave de arranque, sin arrancar el motor durante cinco segundos para calibrar automáticamente los sensores. El sensor de Presión Atmosférica cumple cuatro funciones
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Unidad 2 Lección 2
2-2-12
Sistemas Electrónicos de la Máquina
Fig. 2.2.12 2.2.12 Sensor de temperatura temperatura del refrigerante refrigerante (Motor 3406E)
El sensor de temperatura del refrigerante del motor (flecha) está en la parte delantera del motor, debajo de la caja del termostato. El sensor de temperatura del refrigerante mide la temperatura del refrigerante del motor y la convierte en un valor de resistencia que el ECM puede leer. El sensor de temperatura del refrigerante ayuda a que el ECM determine la sincronización apropiada de inyección. Si la temperatura
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Unidad 2 Lección 2
2-2-13
Sistemas Electrónicos de la Máquina
Fig. 2.2.13 Sensor de presi presión ón del aceite (Motor 3406E)
El sensor de presión del aceite del motor (flecha) está por encima del enfriador de aceite en los motores 3406E. El sensor de presión del aceite es analógico de tres cables, que envía una señal al ECM para indicar la presión de aceite del motor. El ECM suministra cinco voltios al sensor analógico de tres cables. Si la presión del motor está fuera de la especificación, el ECM envía una señal al sistema de control del vehículo para advertir al operador, y el ECM también puede disminuir la potencia del motor.
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Unidad 2 Lección 2
2-2-14
Sistemas Electrónicos de la Máquina
Fig. 2.2.14 2.2.14 Inyector Inyector EUI
El inyector EUI se controla en forma electrónica y se acciona en forma mecánica. La señal del ECM controla la apertura y el cierre de la válvula del solenoide. La válvula del solenoide controla el flujo de combustible de presión alta al cilindro. cilindro. Este sistema hace que el ECM controle el volumen y la sincronización de inyección de combustible. El inyector del motor 3406E tiene códigos de ajuste (código de barras y códigos numéricos), marcados en el botador de válvula. El código
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Unidad 2 Lección 2
2-2-15
Sistemas Electrónicos de la Máquina
Fig. 2.2.15 Componentes Componentes del inyector EUI
En la figura, se muestran los componentes del inyector EUI. Los componentes principales son: - Vá Válv lvul ulaa de de car cartu tuch choo
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Unidad 2 Lección 2
2-2-16
Sistemas Electrónicos de la Máquina
Fig. 2.2.17 Operación del EUI (llenado del inyector)
Las siguientes ilustraciones muestran la secuencia de operaciones de la inyección EUI. La primera parte de la secuencia es el llenado del inyector con aceite
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Unidad 2 Lección 2
2-2-17
Sistemas Electrónicos de la Máquina
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Unidad 2 Lección 2
2-2-18
Sistemas Electrónicos de la Máquina
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Unidad 2 Lección 2
2-2-19
Sistemas Electrónicos de la Máquina
CONTROL DE SINCRONIZACIÓN VELOCIDAD DEL MOTOR CANTIDAD DE COMBUSTIBLE TEMPERATURA REFRIGERANTE
SINCRONIZ. DESEADA BTDC CONVERTIR SELECCIONAR SINCRONIZ. SINCRONIZ. DESEADA
SINCRONIZ. GRADOS BTDC COMB. COMB. RPM
MODALIDAD EN FRÍ O
FORMA DE ONDA DE SINCRONIZACI ÓN DE INYECCI ÓN DE COMBUSTIBLE
La fig. 2.2.22 Lógica del Control de Sincronización EUI
Este diagrama muestra la lógica de control de sincronización dentro del ECM.
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Unidad 2 Lección 2
2-2-20
Sistemas Electrónicos de la Máquina
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Unidad 2 Lección 2
2-2-21
Sistemas Electrónicos de la Máquina
Así como los motores controlados mecánicamente tenían límites mecánicos para determinar el suministro máximo de combustible durante la carga plena, el par pleno y la aceleración, el sistema EUI también tiene límites electrónicos para proteger el motor. motor. Estos límites son: - Pot Potenc encia ia máxima máxima - Límite de par (determina las características de elevación del par) - Control de la la relación de combustible (limita el combustible hasta que se disponga de refuerzo suficiente) - Límite de modalidad fría (regula el combustible, controla el humo blanco cuando el motor está frío)
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Unidad 2 Lección 2
2-2-22
Sistemas Electrónicos de la Máquina
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Unidad 2 Lección 2
2-2-23
Sistemas Electrónicos de la Máquina
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Unidad 2 Lección 2
2-2-24
Sistemas Electrónicos de la Máquina
¿QUÉ TAN PEQUEÑO ES UN MICRÓN? CABELLO HUMANO 88 micrones
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Unidad 2 Lección 2
2-2-25
Sistemas Electrónicos de la Máquina
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NOTAS
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