METHOD FOR CONDITIONING SIGNALS FOR A COLLECTING PARTICLE SENSOR

• US 20130204540A1
• Filed: 01/31/2013
• Published: 08/08/2013
• Est. Priority Date: 02/03/2012
• Status: Abandoned Application

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Genssle, Andreas, Baars, Enno, Kamp, Bernhard, Nagel, Cornelia, Eitel, Markus
• Application Number:
  US13/755,123
• Publication Number:
  US 20130204540A1
• Time in Patent Office: Days
• US Class Current: 702/32
• CPC Class Codes: F01N 11/00 Monitoring or diagnostic devices for exhaust-gas treatment apparatus , e.g. for catalytic activity safety, indicating or supervising devices for internal combustion engines F02B77/08; testing of machines G01M13/00
• CPC Class Codes: F01N 2550/04 Filtering activity of particulate filters
• CPC Class Codes: F01N 2560/05 the means being a particulate sensor
• CPC Class Codes: F01N 2900/0422 measuring the elapsed time
• CPC Class Codes: G01M 15/102 by monitoring exhaust gases
• CPC Class Codes: G06F 17/00 Digital computing or data processing equipment or methods, specially adapted for specific functions information retrieval, database structures or file system structures therefor G06F16/00
• CPC Class Codes: Y02T 10/40 Engine management systems

Abstract

A method for conditioning an output signal of a collecting particle sensor in the exhaust gas duct of an internal combustion engine. The method including continuously storing values of the output signal in a memory, selecting a predetermined number of the stored values of the output signal, and conditioning the output signal based on the selected stored values.

Claims

1. A method for conditioning an output signal of a collecting particle sensor in an exhaust gas duct of an internal combustion engine, the method comprising:

continuously storing values of the output signal in a memory;

selecting a predetermined number of the stored values of the output signal; and

conditioning the output signal based on the selected stored values.

2. The method according to claim 1, wherein the selected stored values include the smallest of the stored values.

3. The method according to claim 1, wherein the selected stored values exclude a number of the smallest of the stored values.

4. The method according to claim 1, wherein the selected stored values exclude a number of the largest of the stored values.

5. The method according to claim 1, wherein the selected stored values include the smallest of the stored values, exclude a number of the smallest of the stored values, and exclude a number of the largest of the stored values.

6. The method according to claim 1, wherein the predetermined number of stored values include two or more of the criteria of including the smallest of the stored values, excluding a number of the smallest of the stored values, and excluding a number of the largest of the stored values.

7. The method according to claim 1, further comprising averaging, in a weighted fashion, the selected values to condition the output signal.

8. The method according to claim 1, characterized in that the selection from the predetermined number of the values last written into the memory comprises a duration of a profile of the output signal of the collecting particle sensor, the duration being longer than a duration of an interference signal to be suppressed.

9. The method according to claim 1, wherein values of the output signal are continuously stored in the memory, and the selected values are selected from the predetermined number of the values last written into the memory, and the selected values are filtered with a low-pass filter, a time constant of the low-pass filter predefined as a function of the selected values.

14. The use of a method according to claim 1 for conditioning the output signal of a resistive particle sensor.

10. A method for conditioning an output signal of a collecting particle sensor in the exhaust gas duct of an internal combustion engine, the method comprising:

filtering the output signal by a low-pass filter with a predefined time constant;

wherein the time constant is predefined as a function of the value of the output signal.

11. The method according to claim 10, wherein the time constant, at high values of the output signal, is less than the time constants at low values of the output signal.

12. The method according to claim 10, wherein the time constant is predefined as a function of operating parameters of the internal combustion engine.

13. The method according to claim 10, wherein the time constant is predefined according to a characteristic curve.