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(11) | EP 1 441 120 A3 |
(12) | EUROPEAN PATENT APPLICATION |
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(54) | Pressure accumulation type fuel injection system |
(57) An engine control unit (ECU) (10) of a common rail type fuel injection system of
an internal combustion engine (1) determines that an abnormality failure of a fuel
supply pump (4) is generated, if an abnormally high-pressure state in which a common
rail pressure exceeds a first threshold or a second threshold continues for a long
time. The ECU (10) stops an operation of the engine (1) immediately or after an elapse
of a predetermined period in accordance with a level of the abnormality failure. Thus,
the abnormally high-pressure state in the common rail (2) can be avoided quickly and
seizing and the like of the fuel supply pump (4) can be prevented. As a result, reliability
and safety of the common rail type fuel injection system can be ensured.
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