FUEL INJECTION CONTROL DEVICE FOR DIRECT-INJECTION ENGINE

摘要

A fuel injection valve (6) is configured such that the effective opening surface area of an injection opening (61) increases as the amount of lift increases. A fuel injection control unit (an engine control unit 100) injects fuel in a lift amount switching mode wherein, when fuel is injected into a combustion chamber (17) in the latter period of the compression stroke, the lift amount of the fuel injection valve is set to a prescribed large lift amount in the first half of the injection period, and in the second half of the injection period following the first half of the injection period, the lift amount is set to a small lift amount that is smaller than the large lift amount and is in a range wherein the fuel injection speed increases.