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Method and apparatus for recognizing knocking of an internal combustion engine, preferably of a gasoline engine

A gasoline engine and internal combustion engine technology, applied in the direction of machines/engines, mechanical equipment, engine components, etc., to achieve the effect of avoiding misjudgment

Active Publication Date: 2015-07-08
ROBERT BOSCH GMBH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But here is usually the question: how should the classification be done in a multidimensional space based on the multiple solid sound features
However, this method is not optimal for knock recognition, because only digital judgments can always be made here, but the knock intensity is a continuous signal
Furthermore, Support Vector Regression (SVR) is known, but it has the disadvantage, at least in standard applications, that the weighting of the individual elements is always the same

Method used

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  • Method and apparatus for recognizing knocking of an internal combustion engine, preferably of a gasoline engine
  • Method and apparatus for recognizing knocking of an internal combustion engine, preferably of a gasoline engine
  • Method and apparatus for recognizing knocking of an internal combustion engine, preferably of a gasoline engine

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Embodiment Construction

[0028] figure 1 A device is shown for detecting a knock signal in an internal combustion engine, which is preferably designed as a gasoline engine. In this exemplary embodiment, the internal combustion engine 1 has four cylinders 2 , 3 , 4 , 5 , the pistons of which, not shown further, move in the cylinders 2 , 3 , 4 , 5 via connecting rods 6 , 7 , 8 respectively. , 9 are connected to crankshaft 10 and drive said crankshaft due to pressure changes caused by combustion. Cylinders 2 , 3 , 4 , 5 are connected to an intake pipe 11 which is closed relative to an air intake pipe 13 via a throttle valve 12 . A nozzle 14 for injecting fuel and an intake valve 15 for fresh air protrude into each cylinder 2 , 3 , 4 , 5 , whereby a fuel-air mixture is formed in the cylinders 2 , 3 , 4 , 5 . Furthermore, each cylinder 2 , 3 , 4 , 5 has an exhaust valve 16 for the exhaust gas produced during the combustion process, as in figure 2 In the example only cylinder 2 is shown. A structure-bo...

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Abstract

In a method for recognizing knocking of an internal combustion engine, solid-borne sound signals are measured and solid-borne sound features are recovered from the measured sound signals. A peak pressure for a combustion event of the internal combustion engine is estimated from the solid-borne sound features, and the estimated peak pressure is compared with a knock recognition threshold, knocking of the internal combustion engine being recognized when the knock recognition threshold is exceeded by the estimated peak pressure.

Description

technical field [0001] The invention relates to a method for detecting knocking of an internal combustion engine, preferably a gasoline engine, in which a structure-borne sound signal is measured, from which structure-borne sound characteristics are obtained; the invention also relates to a device for carrying out the method . Background technique [0002] Knock is usually detected in gasoline engines by means of a knock sensor. In this case, a knock sensor is arranged on the gasoline engine and detects solid-sound vibrations of the gasoline engine which are produced by explosive combustion in the cylinder of the gasoline engine. This explosive combustion, which occurs inside the combustion chamber of a gasoline engine, is converted into vibrations, which are transmitted to the walls of the internal combustion engine and are detected there as solid sound. Excessive vibrations can cause damage to gasoline engines and must therefore be prohibited. [0003] In order to detec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02B77/08
CPCG01H17/00G01L23/221
Inventor W·菲舍尔F·埃希勒W·林德迈尔
Owner ROBERT BOSCH GMBH
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