发明名称 |
Method for monitoring a cylinder valve, actuated via an electromagnetic actuator, in a piston-type internal combustion engine |
摘要 |
A method is provided for monitoring a cylinder valve which is actuated by an electromagnetic actuator including an electromagnet having a magnetic core presenting a pole face and a coil wound around the magnetic core, a return spring and an armature that can be moved by the electromagnet in a direction toward the pole face counter to a force of the return spring for acting upon the cylinder valve. The method includes: measuring a value of one of (a) a time until current in the coil drops to a predetermined lower value after a switching of the current flowing through the coil, (b) a voltage at the coil subsequent to the switching of the current to the coil, (c) the voltage at the coil at a time of maximum approach of the armature to the pole face, and (d) the voltage at the coil at a time subsequent to the time of maximum approach of the armature to the pole face; comparing the measured value to a predetermined value; and generating a signal if a deviation is detected between the measured value and the predetermined value.
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申请公布号 |
US5791305(A) |
申请公布日期 |
1998.08.11 |
申请号 |
US19960694429 |
申请日期 |
1996.08.08 |
申请人 |
FEV MOTORENTECHNIK GMBH & CO KG |
发明人 |
KATHER, LUTZ;SCHMITZ, GUENTER;SCHREY, EKKEHARD |
分类号 |
F01L9/04;H01F7/18;(IPC1-7):F01L9/04 |
主分类号 |
F01L9/04 |
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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