发明名称 |
Apparatus for detecting malfunction in evaporated fuel purge system used in internal combustion engine |
摘要 |
A malfunction detecting apparatus for an evaporated fuel purge system includes a first control valve for controlling a flow of fuel vapor in a purge passage between a canister and an intake passage, a second control valve for controlling a flow of air from the atmosphere to the canister via an air inlet opening of the canister, a first control part for turning OFF the second control valve and for turning ON the first control valve during a first time period, so as to subject the purge passage, the canister, and a vapor passage to a negative pressure of the intake passage during the first time period, and a first discriminator for detecting whether or not a malfunction has occurred in the system, in accordance with a pressure change rate derived from pressures of the system sensed at a start of the first time period and at an end thereof. The apparatus further includes a second control part for detecting whether or not a pressure of the system reaches a prescribed negative pressure after it is detected that no malfunction has occurred in the system, and for turning OFF the first and second control valves during a second time period after the prescribed negative pressure is reached, and a second discriminator for detecting whether or not a malfunction has occurred in the system, in accordance with a pressure change rate derived from pressures of the system sensed at a start of the second time period and at an end thereof.
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申请公布号 |
US5295472(A) |
申请公布日期 |
1994.03.22 |
申请号 |
US19920998191 |
申请日期 |
1992.12.29 |
申请人 |
TOYOTA JIDOSHA KABUSHIKI KAISHA |
发明人 |
OTSUKA, TAKAYUKI;OSAWA, KOUICHI;SUGIYAMA, TATSUMASA;TERAOKA, KATSUHIKO;KOBAYASHI, NOBUYUKI;OKAWA, KOJI |
分类号 |
F02D41/00;F02M25/08;(IPC1-7):F02M33/02 |
主分类号 |
F02D41/00 |
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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