Methods and systems for high pressure port fuel injection

Patent metadata

Field	Value
Publication number	US-9726106-B2
Application number	US-201414570802-A
Country	US
Kind code	B2
Filing date	Dec 15, 2014
Priority date	Dec 15, 2014
Publication date	Aug 8, 2017
Grant date	Aug 8, 2017

Abstract

Systems and methods for improving fuel injection of an engine that includes a cylinder receiving fuel from two different fuel injectors is disclosed. In one example, fuel is supplied to port fuel injectors and direct fuel injectors via a same high pressure fuel pump, and high pressure port fuel injection is activated at times where direct fuel injection would supply less fuel than is desired or an inconsistent amount of fuel.

First claim

The invention claimed is:

1. A method for fueling a cylinder, comprising:
activating a port fuel injector in response to a request to inject a fuel amount into a cylinder during a cylinder cycle, the fuel amount when injected via a direct fuel injector causes the direct fuel injector to operate in a ballistic operating region.

2. The method of claim 1 , further comprising pumping fuel via a low pressure fuel pump to a high pressure fuel pump, and supplying fuel pressurized by the high pressure fuel pump to the port fuel injector and the direct fuel injector.

3. The method of claim 2 , where fuel supplied to the port fuel injector is a higher pressure than a pressure at an outlet of the low pressure fuel pump.

4. The method of claim 1 , where the port fuel injector supplies fuel to the cylinder during intake valve opening of the cylinder.

5. The method of claim 1 , where the ballistic operating region is a non-linear fuel flow region, and where the non-linear fuel flow region is activated via supplying a voltage pulse to the direct fuel injector that is less than a threshold time.

6. The method of claim 1 , where the fuel amount is requested when an engine in which the cylinder operates is at idle.

7. The method of claim 1 , further comprising deactivating the direct fuel injector in response to the request to inject the fuel amount into the cylinder, and where the fuel amount is based on engine idle conditions.

Assignees

• Ford Global Tech Llc

Inventors

• Surnilla Gopichandra
• Meinhart Mark
• Basmaji Joseph F
• Pursifull Ross Dykstra

Classifications

• F02D41/3809

  Common rail control systems (common rail apparatus F02M55/025, F02M63/0225) · CPC title

• F02M45/00

  Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship {(pumps having such delivery by means of delivery valves F02M59/462)} · CPC title

• F02D2200/101

  Engine speed · CPC title

• F02D41/3094 Primary

  the fuel injection being effected by at least two different injectors, e.g. one in the intake manifold and one in the cylinder · CPC title

• F02D41/345

  Controlling injection timing (F02D41/365 takes precedence) · CPC title