Method for adaptation of a detected camshaft position, control unit for carrying out the method, internal combustion engine, and vehicle

Patent metadata

Field	Value
Publication number	US-11280227-B2
Application number	US-202016995370-A
Country	US
Kind code	B2
Filing date	Aug 17, 2020
Priority date	Aug 15, 2019
Publication date	Mar 22, 2022
Grant date	Mar 22, 2022

Abstract

A method for adaptation of a detected camshaft position of a camshaft in an internal combustion engine with: Detection of an ACTUAL gas signal in a gas space that is associated with the camshaft and is associated with a detected camshaft position; Processing of the gas signal to produce an ACTUAL gas criterion; Modeling of multiple simulated gas criteria, each of which is associated with a target camshaft position; Determination of a simulated gas criterion with the least deviation from the ACTUAL gas criterion; Determination of an ACTUAL camshaft position that corresponds to the simulated gas criterion with the least deviation from the ACTUAL gas criterion; Determination of a camshaft position correction value from the difference between the ACTUAL camshaft position determined and the detected camshaft position; Determination of corrected camshaft positions by correcting the detected camshaft positions with the camshaft position correction value.

First claim

What is claimed is:

1. A method for adaptation of a detected camshaft position of a camshaft in an internal combustion engine, the method comprising:
detecting an ACTUAL gas signal in a gas space that is associated with the camshaft and is associated with a detected camshaft position;
processing the gas signal to produce an ACTUAL gas criterion;
modeling multiple simulated gas criteria, which are associated with a target camshaft position;
comparing the simulated gas criteria with the ACTUAL gas criterion;
determining a simulated gas criterion with the least deviation from the ACTUAL gas criterion;
determining an ACTUAL camshaft position that corresponds to the simulated gas criterion with the least deviation from the ACTUAL gas criterion;
determining a camshaft position correction value from the difference between the ACTUAL camshaft position determined and the detected camshaft position; and
determining at least one corrected camshaft position by correcting the detected camshaft positions with the camshaft position correction value.

2. The method according to claim 1 , wherein the at least one corrected camshaft positions of an intake camshaft and/or an exhaust camshaft is determined.

3. The method according to claim 1 , further comprising:
modeling a valve position criterion of an intake and/or exhaust valve on the basis of the corrected camshaft positions.

4. The method according to claim 3 , further comprising:
modeling a gas charge on the basis of the modeled valve position criteria.

5. The method according to claim 1 , wherein the detected camshaft position is determined in relation to a crankshaft position via a camshaft and crankshaft position sensor arrangement.

6. The method according to claim 4 , wherein the camshaft and/or crankshaft position sensor arrangement includes an inductive speed sensor, a differential Hall sensor, a AMR sensor, and/or a Hall phase sensor.

7. The method according to claim 1 , wherein the ACTUAL gas signal is an ACTUAL pressure signal.

8. The method according to claim 1 , wherein the ACTUAL gas signal is detected as an intake pipe pressure behavior signal in an intake manifold.

9. The method according to claim 1 , wherein the ACTUAL gas signal is detected as an exhaust pipe pressure behavior signal in an exhaust manifold.

10. The method according to claim 1 , wherein the processing of the ACTUAL gas signal to produce a gas criterion is accomplished via a signal filtering method, a FFT filtering method, or a bandpass filtering method.

11. The method according to claim 1 , wherein the generation of the simulated gas criteria is accomplished via a computer-implemented modeling method, a neural network, a Gaussian process model, a polynomial model, or an inverse FFT.

12. The method according to claim 1 , wherein at least one of the following computer-implemented comparison methods is performed in order to determine an ACTUAL camshaft position: a cross-correlation method, a standard deviation, or an averaging.

13. An engine control unit adapted to carry out the method according to claim 1 .

14. An internal combustion engine comprising:
an intake valve arrangement and an exhaust valve arrangement for setting a gas quantity; and
an engine control unit according to claim 13 .

15. A vehicle comprising an internal combustion engine according to claim 14 .

Assignees

• Volkswagen Ag

Inventors

• Mazur Michael
• Jeschke Jens
• Forst Johannes
• Blume Holger
• Gerhardt Nico

Classifications

• G06F18/22

  Matching criteria, e.g. proximity measures · CPC title

• G06F2113/08

  Fluids · CPC title

• F01L2820/042

  Crankshafts position · CPC title

• F02D41/1406 Primary

  with use of a optimisation method, e.g. iteration · CPC title

• G06F30/20 Primary

  Design optimisation, verification or simulation (optimisation, verification or simulation of circuit designs G06F30/30) · CPC title