BOOSTING FUEL INJECTION DEVICE

摘要

PURPOSE: To provide a boosting fuel injection device capable of accurately avoiding troubles with an engine proper and a vehicle by immediately determining the abnormalities of a boosting mechanism. CONSTITUTION: In this fuel injection device, fuel is injected into a combustion chamber 4 by an injector 5 by selectively switching between fuel stored in a common rail 6 and boosted fuel boosted by the boosting mechanism 21 receiving the fuel. The device comprises a crank angle sensor 32 outputting crank pulse signals ΔΘ according to the operating state of an engine 2, a pulse calculation means A3 calculating a pulse width Tn between the crank pulse signals, and a determination means A4 determining that the boosting mechanism 21 is defective when the variation amount δt of the pulse width Tn exceeds a determination threshold δta.