Mitsui Minings & Melting Co., Ltd.

Naoki Munakata

Yunosuke Nakahara

Katsumasa Horii

A system () of the invention is a system for detecting deterioration of a catalyst () provided in an exhaust passage () of an internal combustion engine (), the system including: means () that detects a temperature of an exhaust on an upstream side of the catalyst (); means () that detects a temperature of the exhaust on a downstream side of the catalyst (); a recognition unit () that recognizes, both upstream and downstream of the catalyst (), a change point at which the temperature changes from temperature fall or constant temperature to temperature rise during acceleration operation, or a change point at which the temperature changes from temperature rise or constant temperature to temperature fall during deceleration operation; and a determination unit () that determines that the catalyst () has deteriorated when a difference (&#x394;T or &#x394;T') between the upstream and downstream change points becomes equal to or longer than a predetermined time.

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Saitama, Japan

Naoki Munakata