sistema de inyeccion gasolina
TRANSCRIPT
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INYECCIÓN de GASOLINA
CIRCUITO de ALIMENTACIÓN
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Esquema básico
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Esquema básico
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ELECTROBOMBA
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Características básicas
• Bomba eléctrica de imanes permanentes• Bomba húmeda• Presión: 2 a 5 bares• Caudal: 100 litros/hora (evitar PERCOLACIÓN)• Situación: interior del depósito• Mando:
– Relé tacométrico o– ECU o– Interruptor de inercia
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Bomba de rueda dentada interior
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MÓDULO
BOMBA
AFORADOR
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MANDO de la ELECTROBOMBA
A través de la ECU
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MANDO de la ELECTROBOMBA
A través de relé
tacométrico
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MANDO de la ELECTROBOMBA
CON DOBLE PROTECCIÓN
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Mando combinado ECU-relé
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CITROËN C2
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FILTRO de GASOLINA
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FILTRO de GASOLINA
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AMORTIGUADOR de pulsos
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Regulador de presión
• SITUACIÓN:– En la Rampa o tubo distribuidor– En el interior del depósito de combustible
formando cuerpo con el aforador, la bomba y el filtro (circuito sin retorno – returnless)
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Situación del regulador
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REGULADOR de PRESIÓN
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REGULADOR de PRESIÓN
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RAMPA o tubo de distribución
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Alimentación con retorno y sin retorno
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Con retorno
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Sin retorno
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Mando electrobomba de tres velocidades
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Mando tipo PWM (pulse wide modulation)
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¿En qué consiste esta técnica?
• Pulse-width modulation control works by switching the power supplied to the motor on and off very rapidly. The DC voltage is converted to a square-wave signal, alternating between fully on (nearly 12v) and zero, giving the motor a series of power "kicks".
• If the switching frequency is high enough, the motor runs at a steady speed due to its fly-wheel momentum.
• By adjusting the duty cycle of the signal (modulating the width of the pulse, hence the 'PWM') ie, the time fraction it is "on", the average power can be varied, and hence the motor speed.
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Advantages are,
• The output transistor is either on or off, not partly on as with normal regulation, so less power is wasted as heat and smaller heat-sinks can be used.
• With a suitable circuit there is little voltage loss across the output transistor, so the top end of the control range gets nearer to the supply voltage than linear regulator circuits.
• The full-power pulsing action will run fans at a much lower speed than an equivalent steady voltage.
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Inyector de arranque en frío
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Termocontacto temporizado
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Mando eléctrico del arranque en frío