发明名称 |
Fuel vapor treatment system for internal combustion engine |
摘要 |
A pump generates a gas flow within a measurement passage having an orifice. A differential pressure sensor detects a pressure difference between both ends of the orifice. Switching valves are disposed in the measurement passage to create a first concentration measurement state in which the measurement passage is opened at both ends thereof and the gas flowing through the measurement passage is the atmosphere, and a second concentration measurement state in which the measurement passage is in communication at both ends thereof with a canister and the gas flowing through the measurement passage is a fuel vapor-containing air-fuel mixture provided from the canister. An ECU calculates a fuel vapor concentration by based on a pressure difference detected in the first concentration measurement state and a pressure difference detected in the second concentration measurement state.
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申请公布号 |
US6971375(B2) |
申请公布日期 |
2005.12.06 |
申请号 |
US20050087811 |
申请日期 |
2005.03.24 |
申请人 |
NIPPON SOKEN, INC. |
发明人 |
AMANO NORIYASU;KAWANO TAKANOBU;INAGAKI KOICHI;KOYAMA NOBUHIKO;KANO MASAO;TAKAKURA SHINSUKE;YAMADA YOSHICHIKA |
分类号 |
F02D41/02;F02D45/00;F02M25/07;F02M25/08;F02M33/02;(IPC1-7):F02M33/02 |
主分类号 |
F02D41/02 |
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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