Processing method of a camshaft sensor

Patent metadata

Field	Value
Publication number	US-11946424-B2
Application number	US-202017630948-A
Country	US
Kind code	B2
Filing date	Jul 16, 2020
Priority date	Aug 9, 2019
Publication date	Apr 2, 2024
Grant date	Apr 2, 2024

Abstract

A processing method for a camshaft sensor including a toothed wheel, rotationally integral with a camshaft, rotating in front of a fixed sensing element capable of transmitting a signal indicating the profile of the toothed wheel, the method including the following steps: receiving a tooth edge, identifying the corresponding index, performing at least one first processing operation using each index, further including the following steps: qualifying an index and performing at least one second processing operation using the index, if it is qualified.

First claim

The invention claimed is:

1. A processing method for a camshaft sensor including a toothed wheel having a plurality of tooth edges, rotationally integral with a camshaft, rotating in front of a fixed sensing element configured to transmit a signal indicating a profile of the toothed wheel, each tooth edge of said toothed wheel being characterized by a respective index of said tooth edge, the respective index being a sequence number of the respective tooth edge on the toothed wheel of the camshaft sensor, the method comprising:
receiving a respective one of the tooth edges of the plurality of tooth edges;
identifying the corresponding index corresponding to the respective received tooth edge;
performing at least one first processing operation using each of the identified indices;
qualifying one index by selecting from all the indices, and retaining the qualified index or not retaining said qualified index; and
completing at least one second processing operation using said qualified index.

2. The method as claimed in claim 1 , wherein the one index of the plurality of indices is qualified according to a frequency criterion by qualifying the one index in n, according to a criterion of minimum elapsed time from a previous qualified index, according to a criterion of angular distance relative to a previous qualified index or according to a predefined list of indices, wherein n is any integer that is at least equal to 2.

3. The method as claimed in claim 2 , wherein equidistant indices are qualified.

4. The method as claimed in claim 3 , wherein the number n is an increasing function of the engine speed.

5. The method as claimed in claim 3 , wherein the method is implemented in a multiprocessor or multi-core environment, and
wherein the identifying, the qualifying, and the performing are performed on a first processor or core, and the completing the at least one second processing operation is performed on another processor or core.

6. The method as claimed in claim 3 , further comprising storing the respective index a first time for the at least one first processing operation and separately at least a second time for the at least one second processing operation.

7. The method as claimed in claim 3 , wherein said at least one first processing operation comprises determining an engine speed.

8. The method as claimed in claim 2 , wherein the number n is an increasing function of the engine speed.

9. The method as claimed in claim 8 , wherein the method is implemented in a multiprocessor or multi-core environment, and
wherein the identifying, the qualifying, and the performing are performed on a first processor or core, and the completing the at least one second processing operation is performed on another processor or core.

10. The method as claimed in claim 8 , further comprising storing the respective index a first time for the at least one first processing operation and separately at least a second time for the at least one second processing operation.

11. The method as claimed in claim 8 , wherein said at least one first processing operation comprises determining an engine speed.

12. The method as claimed in claim 2 , wherein the method is implemented in a multiprocessor or multi-core environment, and
wherein the identifying, the qualifying, and the performing are performed on a first processor or core, and the completing the at least one second processing operation is performed on another processor or core.

13. The method as claimed in claim 2 , further comprising storing the respective index a first time for the at least one first processing operation and separately at least a second time for the at least one second processing operation.

14. The method as claimed in claim 2 , wherein said at least one first processing operation comprises determining an engine speed.

15. The method as claimed in claim 1 , wherein the method is implemented in a multiprocessor or multi-core environment, and
wherein the identifying, the qualifying, and the performing are performed on a first processor or core, and the completing the at least one second processing operation is performed on another processor or core.

16. The method as claimed in claim 15 , further comprising storing the respective index a first time for the at least one first processing operation and separately at least a second time for the at least one second processing operation.

17. The method as claimed in claim 1 , further comprising storing the respective index a first time for the at least one first processing operation and separately at least a second time for the at least one second processing operation.

18. The method as claimed in claim 1 , wherein said at least one first processing operation comprises determining an engine speed.

19. The method as claimed in claim 1 , wherein said at least one second processing operation comprises controlling a variable distribution.

20. The method as claimed in claim 1 , wherein the method is implemented in a multiprocessor or multi-core environment, and
wherein the identifying, the qualifying, and the performing are performed on a first processor or core by a parent task, and the completing the at least one second processing operation is performed on another processor or core by a child task of the parent task, the child task not being triggered for an unqualified index.

Assignees

• Vitesco Tech Gmbh

Inventors

• Eloy Stéphane
• Marconato Benjamin

Classifications

• F02D41/009 Primary

  using means for generating position or synchronisation signals · CPC title

• F02D13/0215 Primary

  changing the valve timing only · CPC title

• F02D2200/101

  Engine speed · CPC title

• Y02T10/12

  Improving ICE efficiencies · CPC title