Direct fuel injection internal combustion engine

Patent metadata

Field	Value
Publication number	US-10208698-B2
Application number	US-201715431904-A
Country	US
Kind code	B2
Filing date	Feb 14, 2017
Priority date	Feb 24, 2016
Publication date	Feb 19, 2019
Grant date	Feb 19, 2019

Abstract

A direct fuel injection internal combustion engine having an injector for directly injecting fuel into a combustion chamber thereof is provided. The engine is configured so that a tumble flow is generated in the combustion chamber. A fuel injection by the injector can be performed in a first injection mode and a second injection mode, the first injection mode being a mode in which the fuel injection is completed after the tumble flow is generated, and the second injection mode being a mode in which the fuel injection is completed before the tumble flow is generated. The fuel injection of the first injection mode is performed before completion of the warming-up of the engine, and the fuel injection of the second injection mode is performed after completion of the warming-up of the engine.

First claim

What is claimed is:

1. A direct fuel injection internal combustion engine which has an injector for directly injecting fuel into a combustion chamber thereof, and is configured so that a tumble flow is generated in said combustion chamber,
wherein fuel injection by said injector can be performed in a first injection mode and a second injection mode, the first injection mode being a mode in which the fuel injection is completed after the tumble flow is generated, and the second injection mode being a mode in which the fuel injection is completed before the tumble flow is generated,
wherein the fuel injection of the first injection mode is performed before completion of the warming-up of said engine, and the fuel injection of the second injection mode is performed after completion of the warming-up of said engine.

2. The direct fuel injection internal combustion engine according to claim 1 , wherein the fuel injection of the second injection mode is performed after completion of the warming-up of said engine and in a high rotational speed operating condition where the rotational speed of said engine is comparatively high.

3. The direct fuel injection internal combustion engine according to claim 1 , wherein the fuel injection of the first injection mode comprises three-divided injections which are performed within a predetermined angular period of which the center is the bottom dead center at which the intake stroke ends.

4. The direct fuel injection internal combustion engine according to claim 2 , wherein the fuel injection of the first injection mode comprises three-divided injections which are performed within a predetermined angular period of which the center is the bottom dead center at which the intake stroke ends.

5. The direct fuel injection internal combustion engine according to claim 1 , wherein a pressure of fuel supplied to said injector in the first injection mode is lower than a pressure of the fuel in the second injection mode.

6. The direct fuel injection internal combustion engine according to claim 2 , wherein a pressure of fuel supplied to said injector in the first injection mode is lower than a pressure of the fuel in the second injection mode.

7. The direct fuel injection internal combustion engine according to claim 3 , wherein a pressure of fuel supplied to said injector in the first injection mode is lower than a pressure of the fuel in the second injection mode.

8. The direct fuel injection internal combustion engine according to claim 4 , wherein a pressure of fuel supplied to said injector in the first injection mode is lower than a pressure of the fuel in the second injection mode.

9. The direct fuel injection internal combustion engine according to claim 1 , wherein the fuel injection of the second injection mode is a single injection.

10. The direct fuel injection internal combustion engine according to claim 2 , wherein the fuel injection of the second injection mode is a single injection.

11. The direct fuel injection internal combustion engine according to claim 3 , wherein the fuel injection of the second injection mode is a single injection.

12. The direct fuel injection internal combustion engine according to claim 4 , wherein the fuel injection of the second injection mode is a single injection.

13. The direct fuel injection internal combustion engine according to claim 5 , wherein the fuel injection of the second injection mode is a single injection.

14. The direct fuel injection internal combustion engine according to claim 6 , wherein the fuel injection of the second injection mode is a single injection.

15. The direct fuel injection internal combustion engine according to claim 7 , wherein the fuel injection of the second injection mode is a single injection.

16. The direct fuel injection internal combustion engine according to claim 8 , wherein the fuel injection of the second injection mode is a single injection.

Assignees

• Honda Motor Co Ltd

Inventors

• Nakajima Susumu
• Yokoyama Naoki
• Hirose Kenji
• Hosogai Seiichi
• Hironobu Hidekazu
• Yamanaka Tatsuo
• Kitano Haruya
• Okura Yasuhiro

Classifications

• F02D2041/0015

  for engines with means for controlling swirl or tumble flow, e.g. by using swirl valves · CPC title

• F02D41/402

  Multiple injections · CPC title

• F02D41/3845

  by controlling the flow into the common rail, e.g. the amount of fuel pumped · CPC title

• F02D41/34 Primary

  with means for controlling injection timing or duration · CPC title

• F02D41/068

  for warming-up · CPC title