ADSORPTION MATERIAL DETERIORATION DETERMINING DEVICE

PROBLEM TO BE SOLVED: To provide an adsorption material deterioration determining device capable of surely determining the deterioration of an adsorption material. SOLUTION: This adsorption material deterioration determining device 5 has the adsorption material 51 arranged in an intake air passage 2 for sucking air in an internal combustion engine 1 and adsorbing HC in this intake air passage 2, an HC concentration sensor 52 for detecting the HC concentration in the intake air passage 2, a maximum concentration acquiring part 53d for acquiring the maximum HC concentration when stopping an engine of the internal combustion engine 1 by this HC concentration sensor 52, a minimum concentration acquiring part 53e for acquiring the minimum HC concentration when stopping the engine of the internal combustion engine 1 by this HC concentration sensor 52, and a deterioration determining part 53f for determining the deterioration of the adsorption material 51 on the basis of a difference between the acquired maximum HC concentration and the acquired minimum HC concentration. Since the deterioration of the adsorption material 51 is determined on the basis of the HC concentration in the intake air passage 2 directly detected by the HC concentration sensor 52, the deterioration of the adsorption material 51 can be surely determined. COPYRIGHT: (C)2006,JPO&NCIPI