EXHAUST GAS CLEANER FOR INTERNAL COMBUSTION ENGINE

Title:

EXHAUST GAS CLEANER FOR INTERNAL COMBUSTION ENGINE

Document Type and Number:

WIPO Patent Application WO/2014/122728

Kind Code:

A1

Abstract:

In an internal combustion engine, a hydrocarbon supply valve (15) and an exhaust gas purification catalyst (13) are disposed inside the exhaust gas passage of the engine. A first NOx removal method and a second NOx removal method are selectively used, wherein the first method comprises ejecting hydrocarbons from the hydrocarbon supply valve (15) at a predetermined interval to remove the NOx contained in the exhaust gas, and in the second method, in cases when the amount of the NOx occluded in the exhaust gas purification catalyst (13) has exceeded a first allowable limit, the air-fuel ratio of the exhaust gas being introduced into the exhaust gas purification catalyst (13) is made rich, thereby discharging the occluded NOx from the exhaust gas purification catalyst (13). Alternatively, hydrocarbons are ejected from the hydrocarbon supply valve (15) at predetermined intervals, and in cases when the amount of the NOx occluded in the exhaust gas purification catalyst (13) has exceeded a second allowable limit, which is lower than the first allowable limit, the air-fuel ratio of the exhaust gas being introduced into the exhaust gas purification catalyst (13) is made rich.

Inventors:

HABA YUKI (JP)
YOSHIDA KOHEI (JP)

Application Number:

PCT/JP2013/052608

Publication Date:

August 14, 2014

Filing Date:

February 05, 2013

Export Citation:

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Assignee:

TOYOTA MOTOR CO LTD (JP)
HABA YUKI (JP)
YOSHIDA KOHEI (JP)

International Classes:

F01N3/08; F01N3/36; F02D41/04

Domestic Patent References:

WO2012140784A1	2012-10-18
WO2012086093A1	2012-06-28
WO2012029187A1	2012-03-08
WO2011053117A2	2011-05-05

Foreign References:

JPH11336529A

1999-12-07

Other References: