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Method for detecting and distinguishing preignition and carbon deposition of engine based on ionic current

A technology of ion current and engine, which is applied in engine control, combustion engine, machine/engine, etc., can solve the problem that the threshold judgment method is easy to cause misjudgment, and achieve the effect of protecting the engine structure, reducing the false alarm rate, and improving the detection efficiency

Active Publication Date: 2021-01-01
TONGJI UNIV
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Problems solved by technology

However, in practical applications, it is found that if there is carbon deposit in the cylinder, especially near the spark plug, it will also form a strong ion current signal before ignition. The two signals are relatively similar, and the simple threshold judgment method can easily cause misjudgment

Method used

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  • Method for detecting and distinguishing preignition and carbon deposition of engine based on ionic current
  • Method for detecting and distinguishing preignition and carbon deposition of engine based on ionic current
  • Method for detecting and distinguishing preignition and carbon deposition of engine based on ionic current

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Embodiment

[0042] Such as figure 1 As shown, the present invention provides a kind of engine pre-ignition detection method based on ion current, comprises the following steps:

[0043] A. Collect ion current signals and cylinder pressure signals under different working conditions of the engine (normal, pre-ignition, carbon deposition), where the ion current signals come from the electric field applied between the positive and negative electrodes of the spark plug. ;

[0044] B. Process the collected signal, and use the ion current signal to initially distinguish the pre-ignition cycle and the carbon deposition cycle, specifically: distinguish the pre-ignition and carbon deposition cycles from all data by the ion current signal amplitude in a period of time before the ignition time carbon cycle;

[0045] C. Use the cylinder pressure signal to mark the pre-ignition cycle and the pre-ignition time, specifically: calculate the heat release rate and combustion phase through the cylinder pre...

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Abstract

The invention relates to a method for detecting and distinguishing preignition and carbon deposition of an engine based on ionic current. The method comprises the following steps that S1, an ionic current signal and a cylinder pressure signal of the engine under each working condition are collected; S2, a carbon deposition cycle and a preignition cycle of the engine are screened out by utilizing the ionic current signals, and the preignition cycle and a preignition moment are marked for the ionic current signals by utilizing the cylinder pressure signals; S3, a training data set is constructedby using the marked ionic current signals, and a recurrent neural network model is trained; and S4, the trained recurrent neural network model is transplanted to an engine ECU for real-time detectionof preignition and carbon deposition of the engine. Compared with the prior art, the method has the advantages of being higher in detection success rate, lower in misjudgment probability and the like.

Description

technical field [0001] The invention relates to the technical field of internal combustion engines, in particular to a method for detecting and distinguishing engine pre-ignition and carbon deposits based on ion current. Background technique [0002] When the supercharged engine works in the low-speed and high-load range, it is prone to sporadic pre-ignition, and the occurrence of pre-ignition is relatively random without obvious symptoms. The main hazard of pre-ignition is that it may cause super knock. Since super knock has extremely high peak cylinder pressure (greater than 20MPa) and strong cylinder pressure oscillation (amplitude greater than 2MPa), it may be damaged within a single combustion cycle. engine. [0003] Therefore, there is a need for a low-cost real-time diagnosis strategy that can be quickly judged at the early stage of pre-ignition, so as to facilitate subsequent measures to suppress super knock and obtain better engine performance. [0004] In the exi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D41/22F02D35/02G06N3/04G06N3/08G06K9/62
CPCF02D41/22F02D35/021F02D35/023G06N3/08G06N3/045G06N3/044G06F18/214Y02T10/40
Inventor 李理光王金秋丁伟奇邓俊胡宗杰
Owner TONGJI UNIV
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