| http://www.w3.org/ns/prov#value | - The trap 36 functions in a known manner to reduce the amount of engine-generated NOx exiting the vehicle tailpipe 42 during lean engine operation, based upon such factors as intake air-fuel ratio, trap temperature T (as determined by a trap temperature sensor, not shown), percentage exhaust gas recirculation, barometric pressure, humidity, instantaneous trap ???fullness,??? instantaneous sulfur po
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