Exhaust gas purification system for a gasoline engine
AssigneeUmicore AG & Co. KG
InventorsJan Schoenhaber, Joerg-Michael Richter, Carolin Braun
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Abstract
Subject of the invention is an exhaust gas purification system for a gasoline engine, comprising in consecutive order the following devices: a first three-way-catalyst (TWC1), a gasoline particulate filter (GPF) and a second three-way-catalyst (TWC2), wherein the wash coat load (WCL) of the TWC2 is greater than the WCL of the GPF, wherein the WCL is determined in g/l of the volume of the device. The invention also relates to methods in which the system is used and uses of the system.
Claims22
An exhaust gas purification system for a gasoline engine, comprising in consecutive order the following devices:
- a first three-way-catalyst (TWC1), a gasoline particulate filter (GPF) and a second three-way-catalyst (TWC2),
- wherein the wash coat load (WCL) of the TWC2 is greater than the WCL of the GPF, wherein the WCL is determined in g/l of the volume of the device, and
- wherein the wash coat load (WCL) of the TWC1 is greater than the WCL of the TWC2, wherein the WCL is determined in g/l of the volume of the device, and wherein said consecutive order coincides with a direction of exhaust gas flow away from the engine such that, in use, the TWC1 is positioned more upstream than the GPF and the GPF is positioned more upstream than the TWC2 relative to the direction of the exhaust gas flow.
Dependencies are inferred from the claim text.