| 摘要 |
A diesel engine comprises a high-pressure pump ( 5 ) driven by an engine (E) to supply fuel in a fuel tank ( 2 ) to a common rail ( 3 ), an electric priming pump ( 13 ) provided in a fuel passage ( 15 ) extending from the fuel tank ( 2 ) to the high-pressure pump ( 5 ), and a control device ( 10 ) to control the electric priming pump ( 13 ). The control device ( 10 ) drives the electric priming pump ( 13 ) when the engine is started, if a state that the engine rotating speed (Ne) is higher than a predetermined first rotating speed (N 1 ) and the common rail pressure (Cp) is lower than a predetermined first pressure (C 1 ) continues for a period being equal to or more than a predetermined first period (T 1 ). The burden on the operator is mitigated since necessity for the priming operation can be automatically judged.
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