Patent ID: 8117833
Filing Date: 2012-02-21
Classification: F01N,F02B,F02D,F02M,Y02T

Abstract:
1. A method of controlling a system having an internal combustion engine, a filter arranged in an exhaust passage, which traps particulate matter contained in exhaust gas from said internal combustion engine, a reduction catalyst arranged in said exhaust passage downstream of said filter and which reduces nitrate oxide contained in the exhaust gas with reductant supplied thereto, the method comprising: in a first mode, combusting a first amount of particulate matter trapped in said filter and supplying a first amount of reductant to said reduction catalyst when an amount of particulate matter trapped in said filter is less than a predetermined trapping amount; and in a second mode, combusting a second amount of particulate matter trapped in said filter that is greater than said first amount of particulate matter and supplying a second amount of reductant that is greater than said first amount to said reduction catalyst when an amount of particulate matter trapped in said filter is equal to or greater than said predetermined trapping amount, wherein said internal combustion engine has a fuel injector which injects fuel directly into a combustion chamber, and the method further comprising: