Method and control device for correcting the start of injection of injectors of an internal combustion engine

Patent metadata

Field	Value
Publication number	US-2016146145-A1
Application number	US-201414900562-A
Country	US
Kind code	A1
Filing date	Jun 16, 2014
Priority date	Jun 20, 2013
Publication date	May 26, 2016
Grant date	—

Abstract

A method for correcting the start of injection of injectors of an internal combustion engine, including the following steps: determining a target start of current application depending on at least one parameter of the internal combustion engine; detecting a pressure in an individual accumulator of an injector and determining a measured start of injection on the basis of the pressure; determining a target injection delay depending on at least one parameter of the internal combustion engine; calculating an actual injection delay from the target start of current application and the measured start of injection; comparing the target injection delay and the actual injection delay; and calculating a start-of-current-application correction variable on the basis of the comparison and correcting the target start of current application by the start-of-current-application correction variable.

First claim

1 - 10 . (canceled)

11 . A method for correcting a start of injection of injectors of an internal combustion engine, comprising the steps of
determining a target start of current application as a function of at least one parameter of the internal combustion engine; detecting a pressure in an individual accumulator of an injector and determining a measured start of injection based on the pressure; determining a target injection delay as a function of at least one parameter of the internal combustion engine; calculating an actual injection delay from the target start of current application and the measured start of injection; comparing the target injection delay with the actual injection delay and calculating a start-of-current-application correction variable based on the comparison; and correcting the target start of current application by the start-of-current-application correction variable.

12 . The method according to claim 11 , including storing the start-of-current-application correction variable in a correction characteristic map assigned to the injector.

13 . The method according to claim 12 , wherein the target start of current application is read out from the current application characteristic map.

14 . The method according to claim 13 , wherein the current application characteristic map includes values averaged over a large number of injectors.

15 . The method according to claim 11 , wherein the target injection delay is read out from an injection delay characteristic map.

16 . The method according to claim 15 , wherein the injection delay characteristic map includes values averaged over a large number of injectors.

17 . The method according to claim 11 , wherein the step of calculating the actual injection delay includes subtracting the target start of current application and the measured start of injection from each other.

18 . The method according to claim 17 , wherein the step of calculating the actual injection delay includes subtracting the target start of current application from the measured start of injection.

19 . The method according to claim 11 , wherein the steps of comparing the target injection delay with the actual injection delay includes calculating a difference between the target injection delay and the actual injection delay.

20 . The method according to claim 19 , wherein the actual injection delay is subtracted from the target injection delay.

21 . The method according to claim 11 , including calculating the start-of-current-application correction variable as a difference between the target injection delay and the actual injection delay.

22 . The method according to claim 11 , wherein the start-of-current-application correction variable is weighted.

23 . The method according to claim 11 , including carrying out the method out for each injector of the internal combustion engine, assigning a correction characteristic map to each injector, and making the injectors of the internal combustion engine equal with respect to the start of their injections.

24 . A control device for an internal combustion engine, wherein the control device is configured to implement the method according to claim 10 .

Assignees

• Mtu Friedrichshafen Gmbh

Inventors

• Walder Michael
• Mehr Andreas
• Engler Carsten
• Mlicki Frank
• Wolf Christian
• Bernhard Alexander

Classifications

• F02D41/2432 Primary

  Methods of calibration · CPC title

• F02D41/2467

  for injectors · CPC title

• F02D2200/0602

  Fuel pressure · CPC title

• F02D41/248

  using a plurality of learned values · CPC title

• F02D41/0085

  Balancing of cylinder outputs, e.g. speed, torque or air-fuel ratio · CPC title