Device and method for reducing emissions in catalytic converter exhaust systems
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United States of America Patent
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Mar 12, 2002
Issued Date -
N/A
app pub date -
Feb 18, 2000
filing date -
Feb 22, 1996
priority date (Note) -
Expired
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Abstract
The invention relates to a device and a method for reducing emissions in catalytic converter exhaust systems for a vehicle provided with a combustion engine. The invention comprises a control unit adapted to control the air-fuel being fed to the engine so that a high concentration of hydrogen is generated in the exhaust gas during start-up of the engine. Furthermore, secondary air is supplied downstream of the engine during cold starting thereof for foaming a gas mixture with the exhaust gas. This gas mixture is oxidized, so that heat energy generated by means of this oxidation is supplied to the catalyst, thereby providing a reduction of the light-off time of the catalyst.
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