Patent ID: 8161737
Filing Date: 2012-04-24
Classification: B01D,F01N,F02D,Y02T

Abstract:
1. An exhaust gas purification apparatus comprising: a continuous regenerative filter that oxidizes a particulate matter utilizing nitrogen dioxide while collecting the particulate matter in an exhaust gas; a temperature detector that detects a temperature of the continuous regenerative filter; an exhaust gas properties detector that detects properties of the exhaust gas passing through the continuous regenerative filter; a space velocity detector that detects a space velocity of the exhaust gas passing through the continuous regenerative filter; a forced regenerator that forcibly regenerates the continuous regenerative filter; and a control unit configured to read respective detection signals from the temperature detector, the exhaust gas properties detector, and the space velocity detector and controls the forced regenerator based on the detection signals, wherein the control unit estimates an amount of the particulate matter deposited on the continuous regenerative filter after a lapse of short time under conditions specified by the filter temperature, the exhaust gas properties, and the space velocity with reference to an equation for estimating the amount of the deposited particulate matter derived from a corrected oxidation reaction rate formula that is obtained by application of a correction, corresponding to a reaction rate related with the space velocity, to an oxidation reaction rate formula in which at least one oxidation reaction to oxidize the particulate matter to produce carbon dioxide in the continuous regenerative filter is modeled, and then, when the deposited amount is equal to or more than a predetermined value, executes a forced regeneration processing in the continuous regenerative filter by means of the forced regenerator.