Methods and systems for dual fuel injection

Patent metadata

Field	Value
Publication number	US-10041433-B2
Application number	US-201615156047-A
Country	US
Kind code	B2
Filing date	May 16, 2016
Priority date	Nov 6, 2015
Publication date	Aug 7, 2018
Grant date	Aug 7, 2018

Abstract

Methods and systems are provided for reducing port injection fuel errors by selectively reactivating a direct fuel injector. Responsive to an increase in driver demand received while delivering fuel to a cylinder via port injection only, wherein the increase in driver demand is received late in the port injection window, the port injection error is addressed by reactivating a direct injector on the same engine cycle and delivering at least a portion of the fuel mass corresponding to the error via the direct injector. Additionally, a portion of the fuel mass may be delivered by the port injector on the same engine cycle by extending the end of injection timing, if possible.

First claim

The invention claimed is:

1. A method for an engine, comprising:
while fueling a cylinder via port injection only,
in response to a transient increase in torque demand received later in a port fueling window of an engine cycle, selectively reactivating a direct injector coupled to the cylinder; and
delivering at least a portion of an additional fuel mass required to meet the transient increase in torque demand via direct injection on the engine cycle.

2. The method of claim 1 , wherein the portion of the additional fuel mass delivered via direct injection is increased as a timing of the transient increase in torque demand approaches an end of the port fueling window.

3. The method of claim 1 , wherein the portion of the additional fuel mass delivered via direct injection is greater than a minimum pulse-width of the direct injector.

4. The method of claim 2 , wherein a remaining portion of the additional fuel mass is delivered via port injection on said engine cycle when the timing of the transient increase in torque demand is more than a threshold distance from the end of the port fueling window, and delivered via port injection on an immediately subsequent engine cycle when the timing of the transient increase in torque demand is less than the threshold distance from the end of the port fueling window.

5. The method of claim 2 , wherein the portion of the additional fuel mass delivered via direct injection is further based on the additional fuel mass relative to a minimum pulse-width of the direct injector, the portion increased as the additional fuel mass exceeds the minimum pulse-width of the direct injector.

6. The method of claim 5 , wherein the portion of the additional fuel mass delivered via the direct injector is increased until a maximum pulse-width of the direct injector is reached, and then a remaining portion of the additional fuel mass is delivered via port injection on an immediately subsequent engine cycle.

7. An engine fueling system, comprising:
an engine cylinder;
a port injector;
a direct injector;
a pedal for receiving a driver torque demand; and
a controller with computer-readable instructions for:
in response to a transient increase in driver torque demand received while delivering fuel to the cylinder on an engine cycle via only the port injector,
selectively increasing a pulse-width of the direct injector on said engine cycle to meet at least a portion of the transient increase in driver torque demand.

8. The system of claim 7 , wherein the pulse-width of the direct injector is increased to meet an entirety of the transient increase in driver torque demand when a timing of the transient increase is less than a threshold distance from an end of a port injection fueling window, and when a fuel mass corresponding to the transient increase is between a minimum pulse-width and a maximum pulse-width of the direct injector.

9. The system of claim 7 , wherein the controller includes further instructions for:
selectively increasing a pulse-width of the port injector on said engine cycle to meet a remaining portion of the transient increase in driver torque demand when a timing of the transient increase is more than a threshold distance from an end of a port injection fueling window.

10. The system of claim 7 , wherein the controller includes further instructions for:
selectively increasing a pulse-width of the port injector on an immediately subsequent engine cycle to meet a remaining portion of the transient increase in driver torque demand when a timing of the transient increase is more than a threshold distance from an end of a port injection fueling window.

11. The system of claim 7 , wherein the controller includes further instructions for:
selectively increasing the pulse-width of the direct injector on an immediately subsequent engine cycle to meet a remaining portion of the transient increase in driver torque demand when a timing of the transient increase is more than a threshold distance from an end of a port injection fueling window.

12. The system of claim 7 , wherein the controller includes further instructions for:
selectively increasing the pulse-width of the direct injector on said engine cycle and an immediately subsequent engine cycle when a fuel mass corresponding to the transient increase is higher than a threshold amount.

Assignees

• Ford Global Tech Llc

Inventors

• Hollar Paul
• Farmer Mary Catherine
• Sanborn Ethan D
• Dusa Daniel
• Thomas Joseph Lyle

Classifications

• 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

• F02D41/10

  for acceleration · CPC title

• F02D41/0025

  Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures · CPC title

• F02D19/061 Primary

  by controlling fuel injectors · CPC title

• F02D2200/602

  Pedal position · CPC title