Patent ID: 7730716
Filing Date: 2010-06-08
Classification: B01D,F01N,Y02T

Abstract:
1. A device for judging deterioration of a HC adsorbing material arranged in an exhaust passage of an internal combustion engine, wherein the HC adsorbing material comprises a zeolite having cation adsorption sites to which are bonded ions of an element that exhibits oxygen storage capacity in a nonionic state, and the device comprises: downstream oxygen concentration detecting means arranged downstream of the HC adsorbing material with respect to a flow of exhaust gas, for detecting concentration of oxygen in the exhaust gas; deterioration judging means for detecting manifestation of the oxygen storage capacity of the element, based on a detection output of the downstream oxygen concentration detecting means, to judge deterioration of the HC adsorbing material; and upstream oxygen concentration detecting means arranged upstream of the HC adsorbing material with respect to the exhaust gas flow, for detecting concentration of oxygen in the exhaust gas, and wherein the deterioration judging means judges deterioration of the HC adsorbing material, based on detection outputs of the upstream and downstream oxygen concentration detecting means, wherein the deterioration judging means judges deterioration of the HC adsorbing material, based on the outputs of the upstream and downstream oxygen concentration detecting means detected when a fuel-cut operation of the internal combustion engine is started.