Exhaust gas system of an internal combustion engine with a catalyst
AssigneeVolkswagen Aktiengesellschaft
InventorsMichael Zillmer, Ekkehard Pott, Karsten Michels
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Abstract
An exhaust gas system of an internal combustion engine, including a catalyst, and a cooling section provided upstream of the catalyst. The cooling section includes an additional cooling arrangement provided so that in all operating phases of the internal combustion engine with their different exhaust gas mass flow rates, the amount of thermal energy dissipated from the exhaust gas relative to a total amount of thermal energy present in the exhaust gas (relative heat dissipation) is increased in such a way that a maximum temperature reduction is obtained at intermediate values of the exhaust gas mass flow rate.
Claims12
An exhaust gas system of an internal combustion engine, comprising:
- a catalyst;
- and a cooling section provided upstream of the catalyst, the cooling section including a plurality of exhaust gas lines and additional cooling means provided so that in all operating phases of the internal combustion engine with their different exhaust gas mass flow rates, the amount of thermal energy dissipated from the exhaust gas relative to a total amount of thermal energy present in the exhaust gas (relative heat dissipation) is increased in such a way that a maximum temperature reduction is obtained at intermediate values of the exhaust gas mass flow rate which corresponds to an upper temperature limit for lean engine operation.
An exhaust gas system of an internal combustion engine, comprising:
- a catalyst;
- a cooling section with several separate exhaust gas lines provided upstream of the catalyst;
- at least one coating in an area of the cooling section to promote heat dissipation of heat;
- and a device for subjecting the cooling section to a stream of outside air, the cooling section, the coating and the device being correspondingly arranged so that in all operating phases of the internal combustion engine with their different exhaust gas mass flow rates, the amount of thermal energy dissinated from the exhaust gas relative to a total amount of thermal energy present in the exhaust gas (relative heat dissipation) is increased in such a way that a maximum temperature reduction is obtained at intermediate values of the exhaust gas mass flow rate which corresponds to an upper temperature limit for lean engine operation.
Dependencies are inferred from the claim text.