Direct fuel-injection engine

A direct fuel-injection engine comprising:

• a piston;
• a cavity recessed in a central part of a top face of the piston;
• and
• a fuel injector which injects fuel into the cavity, the fuel injector performs main injection along a fuel-injection axis (Li1, Li2′) oriented toward an inner wall face of the cavity when the piston is located at a first point located near a top dead center of the piston, and performs secondary injection along the fuel-injection axis (Li1, Li2′) when the piston is located at a second position defined further away from the top dead center of the piston than the first point,
• wherein when an intersection point of the fuel-injection axis (Li1, Li2′) with the inner wall face of the cavity during the main injection is defined as a main injection collision point (P1m, P2m′), and an intersection point of the fuel-injection axis (Li1, Li2′) with the inner wall face of the cavity during the secondary injection is defined as a secondary injection collision point (P1s, P2s′), a main injection collision angle (α1m, α2m′) formed between the fuel-injection axis (Li1, Li2′) and the inner wall face on the open end side of the cavity relative to the main injection collision point (P1m, P2m′) is set at an obtuse angle, and a secondary injection collision angle (α1s, α2s′) formed between the fuel-injection axis (Li1, Li2′) and the inner wall face on the open end side of the cavity relative to the secondary injection collision point (P1s, P2s′) is set at one of a right angle and an acute angle.