Diesel engine with dual fuel injection
Methods and systems for supplying fuel to a diesel engine during a cycle of a cylinder are described. In one example, a cylinder is supplied fuel via two fuel injectors having different fuel flow rates. The two fuel injectors may be arranged opposed to each other or in a way that fuel spray from one injector intersects and collides with fuel spray from the other injector.
1. An engine system, comprising:
an engine including at least one cylinder and two pistons positioned within the at least one cylinder;
a first diesel fuel injector supplying fuel to the at least one cylinder;
a second diesel fuel injector supplying fuel to the at least one cylinder, the second diesel fuel injector a higher fuel flow rate injector than the first diesel fuel injector; and
a cavity in a first of the two pistons, where the cavity is asymmetric about a horizontal centerline of the cavity, and where a first opening width of the cavity is less than a second opening width of the cavity.
2. An engine system, comprising:
an opposed piston engine including at least one cylinder and two pistons positioned within the at least one cylinder;
a first diesel fuel injector supplying diesel fuel to the at least one cylinder;
a second diesel fuel injector supplying diesel fuel to the at least one cylinder, the second diesel fuel injector a higher fuel flow rate injector than the first diesel fuel injector; and
a cavity in a first of the two pistons, where the cavity is asymmetric about a horizontal centerline of the cavity, and where a first opening width of the cavity is less than a second opening width of the cavity.
3. The engine system of claim 2 , where a depth of the cavity is non-uniform.
4. The engine system of claim 2 , where the first and second diesel fuel injectors are positioned directly opposed to each other.
5. The engine system of claim 2 , where the horizontal centerline is perpendicular to longitudinal directions of the first and second diesel fuel injectors.
6. The engine system of claim 5 , where the cavity includes three sidewalls.
7. The engine system of claim 1 , wherein the first opening width of the cavity is positioned between the first diesel fuel injector and the horizontal centerline.
8. The engine system of claim 7 , wherein the first diesel fuel injector has a narrower fuel spray cone than the second diesel fuel injector.
9. The engine system of claim 1 , wherein the second opening width of the cavity is positioned between the second diesel fuel injector and the horizontal centerline.
10. The engine system of claim 1 , wherein the horizontal centerline is perpendicular to a vertical centerline, and wherein the cavity is symmetrical about the vertical centerline.
11. The engine system of claim 10 , wherein the first diesel fuel injector and the second diesel fuel injector are positioned directly opposed to each other.
12. The engine system of claim 2 , wherein the first opening width of the cavity is positioned between the first diesel fuel injector and the horizontal centerline.
13. The engine system of claim 12 , wherein the second opening width of the cavity is positioned between the second diesel fuel injector and the horizontal centerline.
14. The engine system of claim 13 , wherein the second diesel fuel injector has a wider spray cone than the first diesel fuel injector.