Introduction to On Board Diagnostics (II)

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Powertrain and EmissionControls in PassengerVehicles (contd(contd)Exhaust & Fuel system:Exhaust valves of the engine cylinders purge the exhaust through the Exhaust Gas linewhich then passes through the catalytic converters in which most of the HC and CO (carbonmonoxide) are oxidized to CO 2(Carbon dioxide) and water. The extra oxygen required for thisoxidation is supplied by adding air to the exhaust stream from an engine driven air pump. This aircalled secondary air, is normally introduced into the exhaust manifold. mThis has a considerableeffect in reducing emissions and meet EPA regulations.The Fuel Pump supplies metered fuel which is electronically injected through nozzles operatedby solenoids under control of the PCM. The fuel in the fuel tank is filtered.The Fuel Level Sensor measures the amount of fuel in the tank.The vacuum sensor measures the inlet vacuum which is a measure of fuel pump suction whichaffects pump priming. The inlet vacuum is monitored to ensure that inlet flow of the fuel to thecylinders is not restricted.
Powertrain and EmissionControl in Passenger Vehicles(contd)Canister vent & Fuel systemThe Canister Vent is used to direct fuel vapors out to a canister r where the vapors areabsorbed by active char coal in the canister. The purge of the fuel fvapors is donevia purge valve periodically.The Fuel Feed and Metering is performed, by the PCM, to match the e mass air flowwhich minimizes HC emissions. The air flow is controlled by the throttle valvewhich is operated by the driver’s pedal.The Fuel Injection nozzles inject the fuel as a spray that spreads the fuel into thecylinder in an atomized manner to mix with the air for complete combustion.
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Fundamentals of PowertrainControl s
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Sensors and ActuatorsEmployed in OB
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Sensors and ActuatorsKnock sensorEm
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Secondary air valvesSensors and Act
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Functionality of PowertrainControl
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Introduction to On Board Diagnostics (II)

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