Processing of signals from a crankshaft sensor

Patent metadata

Field	Value
Publication number	US-11313299-B2
Application number	US-201917291750-A
Country	US
Kind code	B2
Filing date	Nov 8, 2019
Priority date	Nov 8, 2018
Publication date	Apr 26, 2022
Grant date	Apr 26, 2022

Abstract

Disclosed is a method for processing signals from a crankshaft sensor including the following steps: detection of a stopping of the engine; simulation and transmission of a backwards-running square waveform; and simulation and transmission of a forwards-running square waveform. Also disclosed is a processing module configured to implement such a method.

First claim

The invention claimed is:

1. A method whereby a processing module ( 6 ) processes signals from a crankshaft sensor ( 1 ) in order to determine the position of an internal combustion engine upon a starting of said engine following a stopping thereof, said crankshaft sensor comprising a crankshaft wheel ( 2 ) comprising a determined number of teeth and at least one index ( 4 ) allowing a position in the revolution to be identified, said sensor being able, in combination with a processing device ( 5 ) for processing said signals, to determine the position of the crankshaft and direction of rotation of the crankshaft, from said signals comprising forwards-running and backwards-running square waveforms,
the method comprising:
detection of a stopping of said internal combustion engine, and, if the last square waveform received by the processing device ( 5 ) before the stopping of the engine corresponds to the engine rotating backwards:
suspension of the transmission to the processing device ( 5 ) of an “engine stopped” status signal, and then
simulation by the processing module ( 6 ) and transmission to the processing device ( 5 ) of a backwards-running square waveform ( 8 ),
simulation by the processing module ( 6 ) and transmission to the processing device ( 5 ) of a forwards-running square waveform ( 9 ), leading to a detection by the processing device ( 5 ) that the crankshaft is running forwards, and,
following the transmission of the two simulated square waveforms ( 8 , 9 ) to the processing device ( 5 ), the lifting of said suspension and the transmission of the “engine stopped” status signal to the processing device ( 5 ).

2. The method as claimed in claim 1 , wherein the transmission of the backwards-running square waveform ( 8 ) immediately follows the detection that the engine has stopped.

3. The method as claimed in claim 2 , wherein the transmission of the forwards-running square waveform ( 9 ) is delayed after transmission of the backwards-running square waveform ( 8 ) by enough of a delay to render a noise filtering strategy inoperative.

4. The method as claimed in claim 2 , wherein the speed is considered to be equal to a first constant mean value when only a single square waveform has been received, and/or the speed is calculated on the basis of the time between two square waveforms, or is considered to be equal to a second constant mean value when only two square waveforms have been received.

5. The method as claimed in claim 1 , wherein the transmission of the forwards-running square waveform ( 9 ) is delayed after transmission of the backwards-running square waveform ( 8 ) by enough of a delay to render a noise filtering strategy inoperative.

6. The method of claim 5 , wherein the delay is equal to 1 ms.

7. The method as claimed in claim 5 , wherein the speed is considered to be equal to a first constant mean value when only a single square waveform has been received, and/or the speed is calculated on the basis of the time between two square waveforms, or is considered to be equal to a second constant mean value when only two square waveforms have been received.

8. The method as claimed in claim 1 , wherein a calculation of the engine speed ignores the simulated backwards-running square waveform ( 8 ).

9. The method as claimed in claim 8 , wherein the speed is considered to be equal to a first constant mean value when only a single square waveform has been received, and/or the speed is calculated on the basis of the time between two square waveforms, or is considered to be equal to a second constant mean value when only two square waveforms have been received.

10. The method as claimed in claim 1 , wherein a calculation of the engine speed ignores the simulated backwards-running square waveform ( 8 ) and the simulated forwards-running square waveform ( 9 ).

11. The method as claimed in claim 10 , wherein the speed is considered to be equal to a first constant mean value when only a single square waveform has been received, and/or the speed is calculated on the basis of the time between two square waveforms, or is considered to be equal to a second constant mean value when only two square waveforms have been received.

12. The method as claimed in claim 1 , wherein the speed is considered to be equal to a first constant mean value, when only a single square waveform has been received, and/or the speed is calculated on the basis of the time between two square waveforms, or is considered to be equal to a second constant mean value when only two square waveforms have been received.

13. The method of claim 12 , wherein the first constant mean value is 60 rpm.

14. The method of claim 13 , wherein the second constant mean value is 90 rpm.

15. A processing module ( 6 ) for processing signals from a crankshaft sensor ( 1 ), the processing module being configured to implement the method as claimed in claim 2 .

16. A processing module ( 6 ) for processing signals from a crankshaft sensor ( 1 ), the processing module being configured to implement the method as claimed in claim 5 .

17. A processing module ( 6 ) for processing signals from a crankshaft sensor ( 1 ), the processing module being configured to implement the method as claimed in claim 8 .

18. A processing module ( 6 ) for processing signals from a crankshaft sensor ( 1 ), the processing module being configured to implement the method as claimed in claim 10 .

19. A processing module ( 6 ) for processing signals from a crankshaft sensor ( 1 ), the processing module being configured to implement the method as claimed in claim 12 .

20. A processing module ( 6 ) for processing signals from a crankshaft sensor ( 1 ), the processing module being configured to implement the method as claimed claim 1 .

Assignees

• Vitesco Tech Gmbh

Inventors

• Marconato Benjamin
• Eloy Stéphane

Classifications

• F02D41/042 Primary

  for stopping the engine · CPC title

• F02D2041/0092

  Synchronisation of the cylinders at engine start · CPC title

• F02D2041/0095

  Synchronisation of the cylinders during engine shutdown · CPC title

• F02D2250/06

  Reverse rotation of engine · CPC title

• F02D41/009 Primary

  using means for generating position or synchronisation signals · CPC title