发明名称 |
Temperature control device for exhaust gas sensor and temperature control method for the sensor |
摘要 |
<p>The temperature of an exhaust gas flowing through an exhaust passage 3 is estimated or detected, and the temperature of an active element of an exhaust gas sensor 8 (O2 sensor) is controlled at a predetermined target temperature by a heater using the estimated or detected temperature of the exhaust gas. The exhaust passage 3 extending up to the exhaust gas sensor 8 is divided into a plurality of partial exhaust passageways 3a through 3d, the temperatures of the exhaust gas in the partial exhaust passageways 3a through 3d are estimated successively from an exhaust port 2 of an engine 1. The temperature of the exhaust gas is estimated according to an algorithm which takes into account a heat transfer between the exhaust gas and passage-defining members 6a, 6b, 7 which define the exhaust passage 3 and a heat radiation from the passage-defining members into the atmosphere. A control input that is applied to the heater includes at least a component depending on the temperature of the active element of the exhaust gas sensor 8 and a component depending on the temperature of the exhaust gas. Even if the temperature of the exhaust gas changes, the temperature of the active element of the exhaust gas sensor 8 can be controlled stably at the desired temperature. <IMAGE></p> |
申请公布号 |
EP1847900(B1) |
申请公布日期 |
2009.07.29 |
申请号 |
EP20070015515 |
申请日期 |
2003.03.28 |
申请人 |
HONDA GIKEN KOGYO KABUSHIKI KAISHA |
发明人 |
YASUI, YUJI;IWAKI, YOSHIHISA |
分类号 |
G01N27/409;G05D23/24;F02D41/14;F02D45/00;G01N27/406;G05D23/19;G05D23/27 |
主分类号 |
G01N27/409 |
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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