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CHEE 323

28.5

Example of an Emissions Test

CO and hydrocarbon tailpipe

emissions from a test vehicle

during a test cycle. Also shown

is the catalyst temperature and

speed during the cycle.

Catalyst mounted 1.2 m from

exhaust manifold.

As can be seen, the principal CO

and hydrocarbon emissions

occur catalyst warmup. Data for

NO production is not reported.

When hot, the catalyst is very

effective. In practice, one can expect

between 60 and 90% of the engine CO and hydrocarbon emissions, as measured over the whole test cycle, to be removed by the catalyst after 50,000 miles of use.

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