| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a fault detection method for detecting faults in an injector device. <P>SOLUTION: The injector device includes one or more piezoelectric fuel injectors 12a, 12b connected to an injector drive circuit 30, and the injector drive circuit 30 is arranged to control operation of the one or more piezoelectric fuel injectors 12a, 12b. The fault detection method includes a step determining a sample voltage at a sample point PB in the injector drive circuit 30 at a first sample time. The sample voltage is the voltage applied on injectors 12a, 12b or is related to the voltage applied on the injectors 12a, 12b. The method further includes a step calculating a range of predicted voltages expected at the sample point PB at a second sample time following the first sample time, and a step determining the sample voltage at the sample point PB at the second sample time. Presence of a fault is detected if the sample voltage determined at the sample point PB at the second sample time is not within the range of predicted voltages. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
