Method of operating a fuel injector of an internal combustion engine of a motor vehicle

Patent metadata

Field	Value
Publication number	US-10125717-B2
Application number	US-201615361814-A
Country	US
Kind code	B2
Filing date	Nov 28, 2016
Priority date	Nov 27, 2015
Publication date	Nov 13, 2018
Grant date	Nov 13, 2018

Abstract

A method of operating a fuel injector of an internal combustion engine having a reciprocating piston includes performing a multi after-injection pattern having at least one pair of consecutive injection pulses both starting after a top dead center of the piston and separated by a dwell time shorter than 200 as.

First claim

What is claimed is:

1. A method of operating a fuel injector of an internal combustion engine having a reciprocating piston, the method comprising:
performing a multi after-injection pattern having at least one pair of consecutive injection pulses both starting after a top dead center of the piston and separated by a dwell time shorter than 200 μs.

2. The method of claim 1 , wherein the dwell time is in a range between 80 and 150 μs.

3. The method of claim 1 , wherein the pair of injection pulses comprise the last two injection pulses of the multi after-injection pattern.

4. The method according to claim 1 , further comprising starting a first pulse and ending a second pulse in a range between 20 and 80 angular degrees of a crankshaft from the top dead center of the piston.

5. The method according to claim 4 , further comprising starting the first pulse and ending the second pulse in a subrange of the range.

6. The method according to claim 5 , further comprising determining a start of injection of the first pulse and an end of injection of the second pulse, wherein the start of injection of the previous pulse is closer to a lower boundary value of the subrange than the end of injection of the second pulse of the pair is to a higher boundary value of the subrange.

7. The method according to claim 5 , further comprising determining a start of injection of the first pulse and an end of injection of the second pulse, wherein the end of injection of the second pulse of the pair is closer to a higher boundary value of the subrange than the start of injection of the first pulse of the pair is to a lower boundary value of the subrange.

8. A non-transitory computer readable medium including a computer program for operating a fuel injector of an internal combustion engine having a reciprocating piston, the computer program comprising a program code, when run on a computer, configured to actuate the fuel injector for performing a multi after-injection pattern having at least one pair of consecutive injection pulses both starting after a top dead center of the piston and separated by a dwell time shorter than 200 μs.

9. An injection system of an internal combustion engine having a reciprocating piston, the injection system comprising a fuel injector and an electronic control unit configured to actuate the fuel injector for performing a multi after-injection pattern having at least one pair of consecutive injection pulses both starting after a top dead center of the piston and separated by a dwell time shorter than 200 μs.

10. An internal combustion engine equipped with an injection system according to claim 9 .

Assignees

• Gm Global Tech Operations Llc

Inventors

• Ricci Isadora
• Nati Giorgio
• NEGRO Cosma
• Pellegrino Stefano

Classifications

• F02D41/3827

  for diesel engines · CPC title

• F02D41/027

  to purge or regenerate the exhaust gas treating apparatus · CPC title

• F02D41/401

  Controlling injection timing (F02D41/402 takes precedence) · CPC title

• F02D41/405 Primary

  with post injections · CPC title

• F02D41/029

  the exhaust gas treating apparatus being a particulate filter · CPC title