Leakage diagnosing device for fuel evaporated gas purge system

Internal-combustion engines – Charge forming device – Having fuel vapor recovery and storage system

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731181, F02M 3300

Patent

active

061488038

ABSTRACT:
A leakage diagnosing apparatus for an evaporated gas purge system, which executes purge system leakage diagnosis based on a detected pressure change amount and an introduced pressure which is introduced into a part of the purge system including at least a fuel tank and a canister. The detected pressure change amount is obtained by detecting pressure in the part of the purge system after such part of the purge system is hermetically sealed. Accordingly, the reliability of the leakage diagnosis is improved because an erroneous diagnosis caused by the introduced pressure is prevented. The detected pressure change amount may be compensated based on the introduced pressure into the sealed gas purge system. Accordingly, an erroneous leakage determination is prevented, and the reliability of leakage determination is improved.

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patent: 5857447 (1999-01-01), Shinohara
Co-pending, commonly owned U.S. application No. 09/113,281 of Fujimoto et al for "Abnormality Detection Apparatus for Preventing Fuel Gas Emission", filed Jul. 10, 1998.

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