发明名称 |
Method of diagnosing the efficiency of an exhaust gas stoichiometric composition sensor placed downstream of a catalytic converter |
摘要 |
<p>The method of diagnosis determines the state of deterioration of an exhaust gas stoichiometric composition sensor placed downstream of a catalytic converter. The catalytic converter is mounted on an exhaust manifold of an internal combustion engine supplied with an air/fuel mixture, while the sensor generates an output signal correlated with the stoichiometric composition of the mixture. The method comprises the phases of registering a temperature signal correlated with the temperature of the engine; determining the operating range of the engine; determining the stoichiometric composition of the air/fuel mixture; and effecting a hot diagnosis should the temperature signal be greater than a preset reference value, the engine be in the idle operating range and the sensor register a weak stoichiometric composition of the mixture. The hot diagnosis comprises the phases of generating control signals for the engine and of gauging the output signal from the sensor. <IMAGE></p> |
申请公布号 |
EP0796988(A2) |
申请公布日期 |
1997.09.24 |
申请号 |
EP19970104063 |
申请日期 |
1997.03.11 |
申请人 |
MAGNETI MARELLI S.P.A. |
发明人 |
CARNEVALE, CLAUDIO;BIANCONI, PAOLA;SGATTI, STEFANO |
分类号 |
F02D41/14;(IPC1-7):F02D41/14;F02D41/22 |
主分类号 |
F02D41/14 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|