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Abstract

A leakage diagnosis apparatus is applied to a purge apparatus of an internal combustion engine. The purge apparatus includes a canister accommodating an adsorbent for temporarily absorbing fuel vapor produced in a fuel tank. The fuel vapor is desorbed from the adsorbent and purged into an intake passage of the internal combustion engine. A diagnosis unit performs a leakage diagnosis to detect leakage in the purge apparatus. A state measurement unit measures a fuel vapor state of mixture containing the fuel vapor, which is desorbed from the adsorbent. A command unit commands the diagnosis unit to perform the leakage diagnosis at a predetermined time. An evaluating unit evaluates the leakage diagnosis to be performed in an appropriate state on the basis of a change between the fuel vapor state before the leakage diagnosis and the fuel vapor state after the leakage diagnosis.

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First Claim