Patent ID: 8468823

Claim:
A supercharged direct-injection engine comprising: a gasoline engine, a supercharging device for compressing intake air, an injector for directly injecting fuel containing gasoline into a combustion chamber, and an ECU for controlling the injector and the supercharging device to adjust a fuel injection amount and a supercharging amount in such a manner that: an excess air factor λ as a ratio of an actual air-fuel ratio to a stoichiometric air-fuel ratio, at least in an engine warmed-up mode, is set to 2 or more in an entire engine-load region; compressed self-ignited combustion is performed, in a low engine-load region, under a condition that the excess air factor λ is gradually changed to a richer side in the range of 2 or more, along with an increase in engine load; and a fuel injection amount of the injector and a supercharging amount by the supercharging device are increased along with an increase in engine load in a high engine-load region to allow the excess air factor λ to be kept at 2 or more.