| 摘要 |
Fault checking an EPM or a pilot relay, by an EPM driving signal Duty, into the EPM, and a nozzle back-pressure Pn, from the EPM, are sampled. A change speed vDuty (k) of the Duty (k) is calculated from the Duty (k) in the current cycle and the Duty (k−1) from the previous cycle, and a change speed vPn (k) for the Pn (k) is calculated from the Pn (k) for the current cycle and Pn (k−1) from the previous cycle. If both vDuty (k) and vPn (k) are small, then the weighting w1 (k) is defined as 1 (where it is defined as 0 otherwise), and with each sampling a fault check indicator value e1 (k) is calculated from a linear approximation formula F1 that indicates the steady-state input/output relationship, when operating properly, between the Duty (k), Pn (k), and EPM when w1 (k) is 1.
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