Controlled air entrainment passage for diesel engines
First Claim
1. A system, comprising a cooling passage for an engine positioned exterior to a cylinder bore and coupled to the cylinder bore at a first end, forming a first opening in the cylinder bore for receiving gasses from the cylinder bore, where the cooling passage is further coupled to the cylinder bore at a second end, forming a second opening in the cylinder bore for returning the gasses received from the cylinder bore via the first opening, back to the cylinder bore, wherein the cooling passage comprises a cooled air conduit and a fuel spray conduit, the cooled air conduit coupled at a first end to the cylinder bore and at an opposite second end to the fuel spray conduit for directing combustion chamber gasses from the cylinder bore to the fuel spray conduit, and where a first end of the fuel spray conduit is coupled to the cylinder bore and an opposite second end of the fuel spray conduit is positioned in front of a fuel injector, for directing one or more of fuel sprays from the fuel injector and gasses from the cooled air conduit into the cylinder bore, wherein the fuel spray conduit includes one or more surface features that are raised from interior surfaces of walls of the fuel spray conduit.
1 Assignment
0 Petitions
Accused Products
Abstract
Systems are provided for cooling combustion chamber gasses and increasing an amount of air entrained in an injected fuel spray. In one example, a cooling passage may be included in an internal combustion engine, the cooling passage positioned exterior to a cylinder bore of the engine and coupled to the cylinder bore at a first opening and a second opening. The cooling passage may receive gasses from the cylinder bore via the first opening, and may cool the gasses as they travel through the cooling passage before returning the gasses to the cylinder bore via the second opening.
15 Citations
17 Claims
- 1. A system, comprising a cooling passage for an engine positioned exterior to a cylinder bore and coupled to the cylinder bore at a first end, forming a first opening in the cylinder bore for receiving gasses from the cylinder bore, where the cooling passage is further coupled to the cylinder bore at a second end, forming a second opening in the cylinder bore for returning the gasses received from the cylinder bore via the first opening, back to the cylinder bore, wherein the cooling passage comprises a cooled air conduit and a fuel spray conduit, the cooled air conduit coupled at a first end to the cylinder bore and at an opposite second end to the fuel spray conduit for directing combustion chamber gasses from the cylinder bore to the fuel spray conduit, and where a first end of the fuel spray conduit is coupled to the cylinder bore and an opposite second end of the fuel spray conduit is positioned in front of a fuel injector, for directing one or more of fuel sprays from the fuel injector and gasses from the cooled air conduit into the cylinder bore, wherein the fuel spray conduit includes one or more surface features that are raised from interior surfaces of walls of the fuel spray conduit.
-
11. A method comprising:
-
admitting intake gasses from an intake manifold into a combustion chamber during an intake stroke via opening cylinder intake valves; and flowing at least a portion of the intake gasses out of the combustion chamber, into a mixing passage fluidly coupled to the combustion chamber, and through a fuel spray conduit with a raised surface feature extending from interior surfaces of the conduit with multiple grooves therein, during a compression stroke. - View Dependent Claims (12, 13, 14, 15)
-
-
16. An engine comprising:
-
a combustion chamber; an intake manifold fluidly communicating with the combustion chamber via one or more intake valves or intake ports; an exhaust manifold fluidly communicating with the combustion chamber via one or more exhaust valves; a fuel injector; and a mixing passage coupled and open to the combustion chamber for receiving gasses from the combustion chamber, the mixing passage positioned exterior to the combustion chamber, wherein the mixing passage includes a cooled air conduit and a fuel spray conduit, the cooled air conduit coupled at a first end to the combustion chamber, the first end of the cooled air conduit comprising a first opening in the combustion chamber, and at an opposite second end to the fuel spray conduit for directing gasses from the combustion chamber to the fuel spray conduit, and where the fuel spray conduit is coupled at a first end to the combustion chamber, the first end of the fuel spray conduit comprising a second opening in the combustion chamber, and at an opposite second end to the fuel injector for directing fuel injected by the fuel injector from the fuel injector to the combustion chamber via the second opening, wherein the fuel spray conduit includes one or more surface features that are raised from interior surfaces of walls of the fuel spray conduit. - View Dependent Claims (17)
-
Specification