Patent ID: 7458206
Filing Date: 2008-12-02
Classification: F01N,F02B,F02D,F02M,Y02T

Abstract:
1. A method of purifying exhaust gas of an internal combustion engine, which includes a particulate filter disposed in an exhaust passage for collecting particulate matters contained in exhaust gas, the method comprising: calculating a value of a deposited amount of the particulate matters deposited on the particulate filter based on a state of the exhaust gas including a differential pressure between an inlet and an outlet of the particulate filter; measuring a temperature distribution inside the particulate filter; and invalidating the calculated value of the deposited amount of the particulate matters when uniformity of the temperature distribution inside the particulate filter is low; wherein the uniformity of the temperature distribution decreases as a range of temperatures at multiple points inside the particulate filter increases, and the multiple points are arranged on a central axis of the particulate filter or on a plane perpendicular to the central axis.