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Method and device for detecting a knocking occurrence during a switching process between operating modes of an internal combustion engine

A technology of operation mode and conversion process, which is applied in the field of knock recognition, and can solve the problems of not being able to identify knock, wrongly identifying knock, etc.

Active Publication Date: 2011-08-31
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As a result, knocking is sometimes detected incorrectly or not detected

Method used

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  • Method and device for detecting a knocking occurrence during a switching process between operating modes of an internal combustion engine
  • Method and device for detecting a knocking occurrence during a switching process between operating modes of an internal combustion engine
  • Method and device for detecting a knocking occurrence during a switching process between operating modes of an internal combustion engine

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Embodiment Construction

[0037] figure 1 An engine system 1 is shown with an internal combustion engine 2 which is controlled by a control unit 3 . The control unit 3 is contained, for example, in a conventional engine controller and can control all or some of the functions required for operating the internal combustion engine 2 .

[0038] The internal combustion engine 2 is designed to be driven by different fuel types, such as natural gas (CNG) or gasoline, wherein the engine control unit 3 can adjust the operating mode automatically or manually (that is to say specified by the driver). The control unit 3 controls the internal combustion engine 2 by means of engine control signals MS, which can specify, for example, the throttle valve position, the injection quantity (eg by adjusting the opening and closing times of the injection valves), the ignition timing, etc.

[0039] In addition, a knock detection unit 4 is provided, which can obtain an acoustic signal SS, eg in the form of an electrical para...

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PUM

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Abstract

The invention relates to a method for detecting a knocking occurrence during a switching process between operating modes of an internal combustion engine (2). The method comprises the following steps: - recording a course of an acoustic signal (ikr) of an internal combustion engine (2); - determining a reference level (rkr) of the acoustic signal which corresponds to a specification of a basic engine noise according to the course of the acoustic signal (ikr); and - detecting a knocking occurrence according to the reference level (rkr); wherein the reference level (rkr) of the acoustic signal is determined according to the switching process between the operating modes of the internal combustion engine (2).

Description

technical field [0001] The invention relates to the knock detection of internal combustion engines, in particular internal combustion engines which can be selectively operated with different fuel types. Background technique [0002] In order to detect knocking, internal combustion engines are usually provided with acoustic sensors that detect structure-borne sound signals of the engine block. The knock detection is based on the integration of the filtered and rectified structure-borne sound signal or the averaging of the reference level which has been calculated therefrom. The integration of the structure-borne sound signal is usually only carried out in the time region important for knocking, which is defined by One or more measurement windows within the working cycle of the internal combustion engine are determined. The structure-borne sound signal and the reference level are analyzed in the knock adjustment for knock detection. [0003] Modern internal combustion engine...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D19/06F02D41/00G01L23/22
CPCF02D19/0636F02D19/0615F02P5/1527F02D35/027Y02T10/36F02D41/0025G01L23/225F02D19/0647Y02T10/46Y02T10/30Y02T10/40
Inventor S·肯普夫J·格贝尔斯S·索恩O·R·博德P·弗尔沫U·朗T·雅恩A·坎采查尔R·斯洛博达R·艾希霍恩
Owner ROBERT BOSCH GMBH
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