Direct fuel-injected engine

A direct fuel-injection engine comprising a piston (13) having a top face with a height that varies in the circumferential direction, a cavity (25) recessed in a central part of the piston (13), and a fuel injector (23) for injecting fuel along a plurality of fuel injection axes (Li1, Li2) oriented in a plurality of directions spaced in the circumferential direction within the cavity (25),

• characterized in that a squish area (SA) changes in the circumferential direction, and a second collision angle (α2) at which a second fuel injection axis (Li2), oriented in a direction in which the squish area (SA) is large, collides with the cavity (25) is set larger than a first collision angle (α1) at which a first fuel injection axis (Li1), oriented in a direction in which the squish area (SA) is small, collides with the cavity (25).

A direct fuel-injection engine comprising a piston (13) having a top face with a height that varies in the circumferential direction, a cavity (25) recessed in a central part of the piston (13), and a fuel injector (23) for injecting fuel along a plurality of fuel injection axes (Li1, Li2) oriented in a plurality of directions spaced in the circumferential direction within the cavity (25),

• characterized in that a width (W1, W2) of a squish area (SA) changes in the circumferential direction, and a second collision angle (α2) at which a second fuel injection axis (Li2), oriented in a direction in which the width (W2) is large, collides with the cavity (25) is set larger than a first collision angle (α1) at which a first fuel injection axis (Li1), oriented in a direction in which the width (W1) is small, collides with the cavity (25).

A direct fuel-injection engine comprising a piston (13) having a top face with a height that varies in the circumferential direction, a cavity (25) recessed in a central part of the piston (13), and a fuel injector (23) for injecting fuel along a plurality of fuel injection axes (Li1, Li2) oriented in a plurality of directions spaced in the circumferential direction within the cavity (25),

• characterized in that the ridge length of a squish area (SA) changes in the circumferential direction, and a second collision angle (α2) at which a second fuel injection axis (Li2), oriented in a direction in which the ridge length is large, collides with the cavity (25) is set larger than a first collision angle (α1) at which a first fuel injection axis (Li1), oriented in a direction in which the ridge length is small, collides with the cavity (25).

A direct fuel-injection engine comprising a piston (13) having a top face with a height that varies in the circumferential direction, a cavity (25) recessed in a central part of the piston (13), and a fuel injector (23) for injecting fuel along a plurality of fuel injection axes (Li1, Li2) oriented in a plurality of directions spaced in the circumferential direction within the cavity (25),

• characterized in that a squish clearance (C1, C2) changes in the circumferential direction, and a second collision angle (α2) at which a second fuel injection axis (Li2), oriented in a direction in which the squish clearance (C2) is small, collides with the cavity (25) is set larger than a first collision angle (α1) at which a first fuel injection axis (Li1), oriented in a direction in which the squish clearance (C1) is large, collides with the cavity (25).

A direct fuel-injection engine comprising a piston (13) having a top face with a height that varies in the circumferential direction, a cavity (25) recessed in a central part of the piston (13), and a fuel injector (23) for injecting fuel along a plurality of fuel injection axes (Li1, Li2) oriented in a plurality of directions spaced in the circumferential direction within the cavity (25),

• characterized in that the magnitude of reverse squish flow changes in the circumferential direction, and a second fuel injection angle (β2) formed by a second fuel injection axis (Li2), oriented in a direction in which the reverse squish flow is large, relative to the direction of the open end of the cavity (25) is set larger than a first fuel injection angle (α1) formed by a first fuel injection axis (Li1), oriented in a direction in which the reverse squish flow is small, relative to the direction of the open end of the cavity (25).

A direct fuel-injection engine comprising a piston (13) having a top face with a height that varies in the circumferential direction, a cavity (25) recessed in a central part of the piston (13), and a fuel injector (23) for injecting fuel along a plurality of fuel injection axes (Li1, Li2) oriented in a plurality of directions spaced in the circumferential direction within the cavity (25),

• characterized in that a squish area (SA) changes in the circumferential direction, and a second fuel injection angle (α2) formed by a second fuel injection axis (Li2), oriented in a direction in which the squish area (SA) is large, relative to the direction of the open end of the cavity (25) is set larger than a first fuel injection angle (β1) formed by a first fuel injection axis (Li1), oriented in a direction in which the squish area (SA) is small, relative to the direction of the open end of the cavity (25).

A direct fuel-injection engine comprising a piston (13) having a top face with a height that varies in the circumferential direction, a cavity (25) recessed in a central part of the piston (13), and a fuel injector (23) for injecting fuel along a plurality of fuel injection axes (Li1, Li2) oriented in a plurality of directions spaced in the circumferential direction within the cavity (25),

• characterized in that a width (W1, W2) of a squish area (SA) changes in the circumferential direction, and a second fuel injection angle (β2) formed by a second fuel injection axis (Li2), oriented in a direction in which the width (W2) is large, relative to the direction of the open end of the cavity (25) is set larger than a first fuel injection angle (β1) formed by a first fuel injection axis (Li1), oriented in a direction in which the width (W1) is small, relative to the direction of the open end of the cavity (25).

A direct fuel-injection engine comprising a piston (13) having a top face with a height that varies in the circumferential direction, a cavity (25) recessed in a central part of the piston (13), and a fuel injector (23) for injecting fuel along a plurality of fuel injection axes (Li1, Li2) oriented in a plurality of directions spaced in the circumferential direction within the cavity (25),

• characterized in that a ridge length of a squish area (SA) changes in the circumferential direction, and a second fuel injection angle (β2) formed by a second fuel injection axis (Li2), oriented in a direction in which the ridge length is large, relative to the direction of the open end of the cavity (25) is set larger than a first fuel injection angle (α1) formed by a first fuel injection axis (Li1), oriented in a direction in which the ridge length is small, relative to the direction of the open end of the cavity (25).

A direct fuel-injection engine comprising a piston (13) having a top face with a height that varies in the circumferential direction, a cavity (25) recessed in a central part of the piston (13), and a fuel injector (23) for injecting fuel along a plurality of fuel injection axes (Li1, Li2) oriented in a plurality of directions spaced in the circumferential direction within the cavity (25),

• characterized in that a squish clearance (C1, C2) changes in the circumferential direction, and a second fuel injection angle (β2) formed by a second fuel injection axis (Li2), oriented in a direction in which the squish clearance (C2) is small, relative to the direction of the open end of the cavity (25) is set larger than a first fuel injection angle (α1) of a first fuel injection axis (Li1), oriented in a direction in which the squish clearance (C1) is large, relative to the direction of the open end of the cavity (25).