Direct-injection diesel engine and combustion method for the same
First Claim
1. A direct-injection diesel engine comprising:
- a combustion chamber defined by a piston, a cylinder head, and a cylinder liner;
a shallow-dish type piston cavity formed on a top surface of said piston;
a squish area defined by said top surface of said piston and said cylinder head in the vicinity of a compression top dead center;
a fuel injector for injecting fuel into said combustion chamber to combust in a fuel-air mixture state;
wherein;
a distance between opposite wall surfaces of said shallow-dish type piston cavity is set such that ratio Vs/Vsp is not greater than 1.25, in order to use said squish area effectively as a part of said combustion chamber by dispersing and burning a fuel uniformly within said shallow-dish type piston cavity and said squish area;
where;
Vs is a velocity of the reverse squish flow flowing from said shallow-dish type piston cavity to said squish area due to a movement of said piston; and
Vsp is a fuel spray velocity in the vicinity of a lip portion of said shallow-dish type piston cavity.
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Accused Products
Abstract
A direct-injection diesel engine in which a shallow-dish type piston cavity is formed on a top surface of a piston; wherein in the vicinity of the top dead center, a squish area is defined mainly by the top surface of the piston and an inner surface of a cylinder head opposite the top surface; when a velocity of a reverse squish flow from the shallow-dish type piston cavity to the squish area, generated due to a movement of the piston and is represented by Vs, and a fuel spray velocity in the vicinity of a lip portion of the shallow-dish type piston cavity is represented by Vsp, the distance between opposite wall portions of the shallow-dish type piston cavity is set such that the ratio Vs/Vsp is not greater than 1.25; and the squish area constitutes a part of the combustion chamber.
48 Citations
12 Claims
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1. A direct-injection diesel engine comprising:
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a combustion chamber defined by a piston, a cylinder head, and a cylinder liner; a shallow-dish type piston cavity formed on a top surface of said piston; a squish area defined by said top surface of said piston and said cylinder head in the vicinity of a compression top dead center; a fuel injector for injecting fuel into said combustion chamber to combust in a fuel-air mixture state;
wherein;a distance between opposite wall surfaces of said shallow-dish type piston cavity is set such that ratio Vs/Vsp is not greater than 1.25, in order to use said squish area effectively as a part of said combustion chamber by dispersing and burning a fuel uniformly within said shallow-dish type piston cavity and said squish area; where; Vs is a velocity of the reverse squish flow flowing from said shallow-dish type piston cavity to said squish area due to a movement of said piston; and Vsp is a fuel spray velocity in the vicinity of a lip portion of said shallow-dish type piston cavity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification