DEVICE FOR DETECTING DEFECT IN EXHAUST PURIFICASTION SYSTEM

摘要

PROBLEM TO BE SOLVED: To highly accurately detect a defect in an exhaust purification system with a selective reduction NOxcatalyst provided in an exhaust passage of an internal combustion engine.

SOLUTION: A defect in a reduction agent supply device can be detected based on a difference ΔPhox between the rate of NOxpurification at a temperature equal to or higher than an activating temperature and equal to or lower than a NOxpurification rate decreasing temperature that is a temperature where the rate of NOxpurification starts decreasing according to an increases in the temperature of a NOxcatalyst, and the rate of NOxpurification at a temperature higher than the NOxpurification rate decreasing temperature.

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