发明名称 |
Apparatus and method for failure diagnosis of fuel vapor purge system |
摘要 |
A fuel vapor purge system includes a fuel tank, a canister, and an evaporation route, and purges fuel vapor collected in the canister into an intake passage of an internal combustion engine. A failure diagnosis apparatus of the fuel vapor purge system includes a controller having a pressure difference applying unit for applying a pressure difference between the evaporation route and outside air. The controller also detects a level of an influence of the fuel vapor generated in the fuel tank on failure determination of the evaporation route, and detects both a pressure state obtained when the pressure difference applying unit communicates with a reference orifice communicating with the outside air and a pressure state obtained when the pressure difference applying unit communicates with the evaporation route. The failure diagnosis apparatus determines whether there is a failure in the evaporation route in view of the level of the influence by comparing the detected pressure states with each other.
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申请公布号 |
US6848298(B2) |
申请公布日期 |
2005.02.01 |
申请号 |
US20020319685 |
申请日期 |
2002.12.16 |
申请人 |
TOYOTA JIDOSHA KABUSHIKI KAISHA;DENSO CORPORATION |
发明人 |
MIYAHARA HIDEKI;ITO TOKIJI;HANAI SHUICHI;ICHIKAWA AKIRA;NAGASAKI KENJI |
分类号 |
G01M15/04;F02M25/08;(IPC1-7):G01N3/04 |
主分类号 |
G01M15/04 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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