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Exhaust emission control apparatus for internal combustion engine

Image Number 10 for United States Patent #6050086.

An exhaust emission control apparatus for an internal combustion engine includes an electrically-heated catalytic converter and a secondary air supply device. The converter is electrically heated with a predetermined delay after the secondary air supply device starts supplying fresh air to exhaust gases of the engine. This prevents the increase of an intake air flow due to the no-delay electric heating of the converter, and therefore the thermal reactor effect of the secondary air supply device is ensured.

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