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CHEE 323

28.9

Closed-Loop Fuel Metering System

TWC systems require the

air-to-fuel mixture charged

to the engine to be controlled

precisely if they are to

function effectively.

This is accomplished by

positioning an oxygen sensor

in the exhaust manifold to record

the discharge O2 content.  Air flow to the engine is monitored as it responds to variations in throttle position and load.

Computer control regulates the fuel metered to the engine to control the reaction stoichiometry.

Nevertheless, a TWC catalyst “sees” an exhaust composition that fluctuates between rich and lean.

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