Patent ID: 7600372
Filing Date: 2009-10-13
Classification: F01N,F02B,F02D,F02M,Y02T

Abstract:
1. An exhaust gas control apparatus for an internal combustion engine, comprising: a supercharger whose turbine is provided in an exhaust passage for an internal combustion engine; an exhaust gas purification device which is provided in the exhaust passage at a portion downstream of the turbine, and which has an oxidizing function; an unburned fuel component supply device that supplies an unburned fuel component to the exhaust passage at a portion upstream of the exhaust gas purification device so that the unburned fuel component is supplied to the exhaust gas purification device when a prescribed condition is satisfied; a bypass passage whose first end is connected to the exhaust passage at a portion upstream of the turbine such that exhaust gas which has flown into the bypass passage through the first end flows so as to bypass the supercharger, and whose second end is connected to the exhaust passage at a portion close to a front end surface of the exhaust gas purification device such that the exhaust gas that has flown in the bypass passage is discharged toward the front end surface ( a bypass state changing device for allowing the exhaust gas to flow in the bypass passage, and prohibiting the exhaust gas from flowing into the bypass passage; and a pressure difference detecting device for detecting a pressure difference between a pressure in the exhaust passage at a portion upstream of the turbine, and a pressure in the exhaust passage at a portion which is downstream of the turbine, and which is upstream of the exhaust gas purification device, wherein when the pressure difference detected by the pressure difference detecting device is equal to or greater than a prescribed pressure difference, the bypass passage state changing device allows the exhaust gas to flow in the bypass passage so that the exhaust gas is blown to the front end surface of the exhaust gas purification device in the lateral direction of the front end surface.