INTERNAL COMBUSTION ENGINE FUEL INJECTION SYSTEM

摘要

PROBLEM TO BE SOLVED: To ensure prompt restart after idling stop and prevent degradations in drivability and NVH and the like immediately after restart by eliminating the occurrence of knocking at a time of the restart.SOLUTION: An internal combustion engine fuel injection system comprises: a high-pressure fuel distribution pipe 54 injecting fuel into cylinders 12a to 12d; a low-pressure fuel supply pipe 42 injecting the fuel to an intake manifold 14; and a fuel pressure sensor 56 measuring a fuel pressure of the high-pressure fuel distribution pipe 54. An ECU 60 includes an idling stop/start unit 68 stopping an engine 10 when an idling stop condition is satisfied and restarting the engine 10 when the idling stop condition is canceled; and a fuel injection control unit 70 selecting the cylinder having a cylinder internal pressure at which the fuel remaining in the high-pressure fuel distribution pipe 54 in response to a measurement value of the fuel pressure sensor 56, and injecting the fuel from the high-pressure fuel distribution pipe 54 into the selected cylinder before a crankshaft 32 starts rotating by a starter 34.