Patent ID: 6807807
Filing Date: 2004-10-26
Classification: F01N,Y02T

Abstract:
An exhaust gas purifying apparatus for an internal combustion engine, comprising:a particulate filter which is disposed in an exhaust gas path of the internal combustion engine, and which collects particulates in exhaust gas; an oxidation catalyst positioned on the upstream side of the filter and disposed in the exhaust gas path; and forcible recovery control element for executing filter temperature raising control in which a temperature of the filter is raised by supplying unburned fuel to the oxidation catalyst after executing catalytic temperature raising control in which the oxidation catalyst is activated by making an exhaust gas temperature of the engine rise, when the filter is forcibly recovered, the exhaust gas purifying apparatus for an internal combustion engine, further comprising: a front oxidation catalyst positioned further upstream than the oxidation catalyst and disposed in the exhaust gas path; a bypass path provided in the exhaust gas path so as to bypass the front oxidation catalyst; and a passage switching device which switches the flow of exhaust gas to the front oxidation catalyst side or the bypass path side, wherein, at the time of executing the catalytic temperature raising control, the passage switching device switches the flow of exhaust gas to the front oxidation catalyst side, and at the time of executing the filter temperature raising control, the passage switching device switches the flow of exhaust gas to the bypass path side.