Method for estimating the pinking intensity of an internal combustion engine by inverting a wave equation

一种内燃发动机、爆震强度的技术，应用在内燃活塞发动机、燃烧发动机、发动机的测试等方向，能够解决估计爆震强度、不允许等问题

Inactive Publication Date: 2012-12-05
INST FR DU PETROLE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] However, these methods do not allow real-time (calculations should typically be completed within 50 μs to be loaded on a computer) estimate of knock intensity

Method used

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  • Method for estimating the pinking intensity of an internal combustion engine by inverting a wave equation
  • Method for estimating the pinking intensity of an internal combustion engine by inverting a wave equation
  • Method for estimating the pinking intensity of an internal combustion engine by inverting a wave equation

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Embodiment Construction

[0030] The method according to the invention relates to a method of combustion control of an internal combustion engine which takes into account the phenomenon of knocking. The method includes estimating the engine knock intensity by processing the signal sent by the sensor, and the signal has physical meaning for directly qualitative combustion and possible occurrence of knock. The method is independent of the nature of the combustion and the cylinder pressure sensor technology used.

[0031] The present invention is described in terms of a specific embodiment, where the method is described as applied to a single cylinder, and does not contain specificities associated with the combustion mode of the engine. According to this embodiment, a cylinder pressure sensor is used. The nature of the internal combustion engine and the cylinder pressure sensor technology used do not affect the principle of the method.

[0032] figure 1 The general principle of the control method accor...

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Abstract

A method of real-time estimation of the intensity of the knocking of an internal combustion engine utilizing a vibratory sensor is disclosed which is useful for control of internal combustion. A vibratory signal representing vibrations of the engine is continuously acquired as a function of the crankshaft angle. A model of a wave equation propagating through the cylinder-head is constructed. The coefficients of a Fourier decomposition of the vibratory signal are determined in real time by inverting the dynamics of the wave equation model using an estimator. The energy contained in the signal is computed by summing the squares of the coefficients of the Fourier decomposition. A parameter correlated with the intensity of knocking equal to the square root of the maximum of the energy is determined in real time.

Description

technical field [0001] The invention relates to the field of combustion control of internal combustion engines. In particular, the invention relates to a method for estimating the knock intensity of such an engine by means of sensors placed inside the engine. [0002] This type of engine comprises at least one cylinder having a combustion chamber delimited by the internal side walls of the cylinder, the top of a piston sliding in the cylinder, and the cylinder head. In general, the gas mixture is enclosed in this combustion chamber and undergoes a compression step followed by a combustion step under the action of a controlled ignition by means of a spark plug, which are grouped in the following description under the term "combustion phase" . [0003] In engines with a combustion expansion stroke, combustion of the air / gasoline mixture typically begins after the ignition spark. The flame front spreads and its airflow pushes a portion of the mixture against the cylinder walls...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D28/00G01M15/08
CPCG01L23/221G01M15/042F02B77/085F02P5/152G01L23/227Y02T10/40
Inventor J·肖万
Owner INST FR DU PETROLE
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