Introduction to On Board Diagnostics (II)

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Oxygen sensor:Powertrain and EmissionControls in PassengerVehicles (contd(contd)The Oxygen sensor is used to monitor the residual oxygen (after catalysis in theconverter) in the exhaust gases. The oxygen sensor output is calibrated tomeasure the air/fuel ratio (which is proportional to oxygen in the texhaust gases)in the engine cylinders. This ratio, called Lambda, is one (1) for stoichiometric(14.7) air/fuel ratio. This is the target for realizing minimum emissions.The oxygen sensor is used as stoichiometry detector and is connected in a closedloop in a Limit Cycle control. The oxygen sensor output is a switch signal(ON/OFF) that brings back the A/F ratio to 1 when it varies between een 0.93 to 1.07.
Powertrain and EmissionControls in PassengerVehicles (contd(contd)Oxygen sensorThe reason that oxygen sensor behaves in this manner is thatthe catalytic converter is most efficient in eliminating allpollutants by oxidizing HC to CO 2 and reducing NOx to N 2when the exhaust gases indicate a stoichiometric (14.7) air/fuelratio, indicated by the Exhaust Gas Oxygen (EGO) Sensor..Catalytic Converter is a three way catalyst which will oxidizethe Hydro carbons including CO to CO 2 and reduce the NOx toN 2 in the exhaust gases simultaneously thus removingpollutants.
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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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