发明名称 |
Monitoring device and method of a 3-way catalyst in the exhaust pipe of an internal combustion engine |
摘要 |
Process for monitoring the function of a three-way catalyst in the exhaust gas channel of an IC engine comprises determining the lambda region; acquiring the size of the NOx signal and/or the value of a gradient of the NOx signal in a prescribed measuring interval within the lambda region; and comparing with threshold values and indicating damage to the catalyst on exceeding the threshold values. An independent claim is also included for a device for monitoring the function of a three-way catalyst in the exhaust gas channel of an IC engine. Preferred Features: The lambda region comprises a stoichiometric operating point of the IC engine. During the function monitoring by a control device, a NOx signal of a NOx-sensitive measuring device and a lambda value are acquired using at least one lambda probe. A mixture composition to be burned in the direction of an actual operating point is influenced depending on the gradient of the lambda value and the NOx signal until a prescribed theoretical value for the gradient of the NOx signal is reached. |
申请公布号 |
EP1136670(B1) |
申请公布日期 |
2005.03.09 |
申请号 |
EP20010106234 |
申请日期 |
2001.03.14 |
申请人 |
VOLKSWAGEN AKTIENGESELLSCHAFT |
发明人 |
HAHN, HERMANN;GOEMER, STEFFEN;DAETZ, MICHAEL |
分类号 |
F01N11/00;F02M25/07 |
主分类号 |
F01N11/00 |
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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