METHOD FOR DIAGNOSING A SUPERCHARGING SYSTEM OF INTERNAL COMBUSTION ENGINES

• US 20140107905A1
• Filed: 02/22/2012
• Published: 04/17/2014
• Est. Priority Date: 04/08/2011
• Status: Abandoned Application

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Kassner, Uwe
• Application Number:
  US14/110,632
• Publication Number:
  US 20140107905A1
• Time in Patent Office: Days
• US Class Current: 701/101
• CPC Class Codes: F02D 2041/288 for performing a transformation into the frequency domain, e.g. Fourier transformation
• CPC Class Codes: F02D 2200/025 Engine noise, e.g. determined by using an acoustic sensor
• CPC Class Codes: F02D 41/0007 for control of turbo-charged or super-charged engines control of the pumps per se F02B37/12
• CPC Class Codes: F02D 41/22 Safety or indicating devices for abnormal conditions in air/fuel ratio feedback systems F02D41/1495, in electric control linkage F02D11/107, in purge control systems F02M25/0809
• CPC Class Codes: F02D 45/00 Electrical control not provided for in groups F02D41/00 - F02D43/00
• CPC Class Codes: G01M 15/12 by monitoring vibrations
• CPC Class Codes: G01P 3/48 by measuring frequency of generated current or voltage in general G01R23/00
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies
• CPC Class Codes: Y02T 10/40 Engine management systems

Abstract

A method for diagnosing a forced induction system is described, in which by measured data acquisition the frequency spectrum generated upon rotation of the forced induction system is acquired, and by measured data evaluation the acquired frequency spectrum is evaluated using frequency analysis. A frequency characteristic of the forced induction system, ascertained by frequency analysis, for at least one predefined operating point of the forced induction system is compared with a predefined vehicle-specific frequency characteristic of the forced induction system for the at least one predefined operating point.

Claims

1-8. -8. (canceled)

9. A method for diagnosing a forced induction system of an internal combustion engine, comprising:

acquiring by measured data acquisition a frequency spectrum generated by the forced induction system,

evaluating by measured data evaluation the acquired frequency spectrum using frequency analysis, and

comparing a frequency characteristic of the forced induction system, ascertained by frequency analysis, for at least one predefined operating point of the forced induction system with a predefined vehicle-specific frequency characteristic of the forced induction system for the at least one operating point of the forced induction system.

10. The method according to claim 9, wherein an actual rotation speed of the forced induction system is ascertained from the ascertained frequency characteristic at the predefined operating point;

and the ascertained actual rotation speed is compared with a predefined vehicle-specific target rotation speed of the forced induction system which characterizes the predefined operating point.

11. The method according to claim 10, further comprising:

inferring a functionality of the forced induction system on the basis of the comparison of the actual rotation speed of the forced induction system with the target rotation speed of the forced induction system.

12. The method according to claim 9, wherein noise and/or vibrations generated by the forced induction system are acquired in the context of the measured data acquisition for detection of the frequency spectrum.

13. The method according to claim 9, wherein the measured data acquisition for acquisition of the frequency spectrum of the forced induction system is accomplished during a predefined driving profile of a motor vehicle.

14. The method according to claim 13, wherein the measured data acquisition for acquisition of the frequency spectrum of the forced induction system is accomplished during the predefined driving profile while driving the motor vehicle.

15. The method according to claim 9, further comprising:

scanning the frequency characteristic for further atypical frequencies; and

inferring damage to the forced induction system from a presence of atypical frequencies.

16. The method according to claim 9, further comprising:

subjecting the ascertained frequency characteristic to an amplitude evaluation; and

performing a noise diagnosis of the forced induction system on the basis of the amplitude evaluation.