| 摘要 |
A method and apparatus for detecting faults in an injector arrangement is described. The injector arrangement comprises a plurality of piezoelectric injectors (12a, 12b), which are located in parallel branches (33a, 33b) of an injector bank circuit (33) of an injector drive circuit (30a). Each branch (33a, 33b) of the injector bank circuit (33) comprises a high side isolation switch (QHS1, QHS2). The high side isolation switches (QHS1, QHS2) are each operable to enable an associated piezoelectric injector (12a, 12b) in the injector bank circuit (33) when closed, and disable the associated piezoelectric injector (12a, 12b) in the injector bank circuit (33) when open. The fault detection method comprises the steps of operating the high side isolation switches (QHS1, QHS2) to enable one of the piezoelectric injectors (12a, 12b) and disable the other piezoelectric injector(s) (12a, 12b), and performing diagnostics to detect the presence or absence of faults on the enabled piezoelectric injector (12a, 12b). |
