Exhaust gas purification system for purifying exhaust gases of gasoline engines
AssigneeUmicore AG & Co. KG
InventorsJan Schoenhaber, Joerg-Michael Richter, Carolin Braun, Tim Palm
Life of this patent
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Abstract
The invention is directed to the purification of exhaust gases of an internal combustion engine operated predominantly with a stoichiometric fuel mixture. The exhaust gas system has in particular 4 purification functions in a particular order. A three-way catalyst (TWC1) near the engine is followed by a gasoline particle filter (GPF) and another three-way catalyst (TWC2) downstream thereof. The system additionally includes a hydrocarbon storage function.
Claims18
An exhaust gas purification system for purifying exhaust gases of a predominantly stoichiometrically operated internal combustion engine, the system comprising:
- a three-way catalyst (TWC1) near the engine on a flow-through substrate, a gasoline particulate filter (GPF) attached downstream of the TWC1 as a wall-flow filter, and a further three-way catalyst (TWC2) on a flow-through substrate downstream of the GPF,
- wherein the system additionally comprises materials for temporarily storing hydrocarbons, and these are positioned on the downstream side of the TWC1 and behind the GPF,
- wherein the materials for temporarily storing hydrocarbons are arranged on a separate flow-through substrate, and
- wherein the substrate with the materials for temporarily storing hydrocarbons makes up a proportion of 5-30 vol. % of the total volume of the substrates in the exhaust gas purification system.
An exhaust gas purification system for purifying exhaust gases of a predominantly stoichiometrically operated internal combustion engine, the system comprising:
- a three-way catalyst (TWC1) near the engine on a flow-through substrate, a gasoline particulate filter (GPF) attached downstream of the TWC1 as a wall-flow filter, and a further three-way catalyst (TWC2) on a flow-through substrate downstream of the GPF,
- wherein the system additionally comprises an additional catalyst substrate (CAT) having materials for temporarily storing hydrocarbons, and the CAT is positioned downstream of each of the TWC1, GPF and TWC2, and
- wherein the substrate of the CAT makes up a proportion of 5-30 vol. % of the total volume of the substrates in the exhaust gas purification system.
An exhaust gas purification system for purifying exhaust gases of a predominantly stoichiometrically operated internal combustion engine, the system comprising:
- a three-way catalyst (TWC1) near the engine on a flow-through substrate, a gasoline particulate filter (GPF) attached downstream of the TWC1 as a wall-flow filter, and a further three-way catalyst (TWC2) on a flow-through substrate downstream of the GPF,
- wherein the system additionally comprises an additional catalyst substrate (CAT) having materials for temporarily storing hydrocarbons, and the CAT is positioned upstream of the GPF, and
- wherein the CAT substrate makes up a proportion of 5-30 vol. % of the total volume of the substrates in the exhaust gas purification system.
Dependencies are inferred from the claim text.