GDI gasoline engine spray wall-impingement parameter automatic extraction method and system based on machine vision

A technology of machine vision and automatic extraction, which is applied in the direction of instrumentation, image data processing, calculation, etc., can solve problems such as blurred structure boundaries, large influence of human factors, time-consuming and laborious, etc., to avoid errors in straight line extraction and ensure accuracy , the effect of accurate extraction

Pending Publication Date: 2020-12-08
CHANGCHUN UNIV
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  • Application Information

AI Technical Summary

Problems solved by technology

During the research process, there is no effective method for how to quickly and accurately extract the characteristic parameters of spray images for a large number of images of spray impingement walls with complex structures and blurred boundaries under different conditions and at different acquisition times.
At present, at home and abroad, manual calibration or

Method used

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  • GDI gasoline engine spray wall-impingement parameter automatic extraction method and system based on machine vision
  • GDI gasoline engine spray wall-impingement parameter automatic extraction method and system based on machine vision
  • GDI gasoline engine spray wall-impingement parameter automatic extraction method and system based on machine vision

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] 1GDI spray wall image hardware acquisition device

[0084] The spray wall image acquisition system is mainly composed of a visual container fixing device, a high-speed photography system, a control system and a computer image processing system. Based on a self-designed visual spray wall-impacting bomb device, V611 high-speed camera is used, and the rapid prototyping tool dSPACE is used to realize the overall control of fuel injection and high-speed camera. The shadow method of direct shooting using reflected light can realize the shooting of the image of the spray hitting the wall, and connect to the host computer through the data line to record and save the required image. The system device is as follows: figure 1 shown. The resolution used in the experiment is 512 pixels × 480 pixels, and the sampling frequency is 20000fps.

[0085] 2 Image preprocessing of spray impingement wall

[0086] The image of the spray hitting the wall collected by the high-speed camera co...

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PUM

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Abstract

The invention discloses a GDI gasoline engine spray wall-impingement parameter automatic extraction method and system based on machine vision. The method comprises the following steps: step 1, background separation; 2, hierarchical binarization based on wavelet transform; 3, extraction of spray wall-impingement parameters: 3.1, extraction of a spray penetration distance L; 3.2, extraction of a spray cone angle theta; 3.3, extraction of a spraying radius r; and 3.4, extraction of a spray height h. The automatically extracted spray wall-impingement parameters can accurately reflect the spray wall-impingement development trend, the parameter values are basically consistent with those in a manual calibration result, the error is small, and the spray wall-impingement parameters can be automatically, rapidly and accurately extracted.

Description

technical field [0001] The invention relates to the field of machine vision, in particular to a machine vision-based automatic extraction method and system for GDI gasoline engine spray wall collision parameters. Background technique [0002] GDI gasoline engine has potential advantages in improving power performance, fuel economy and reducing harmful emissions [1-2] . However, the phenomenon of spray hitting the wall inevitably occurs during the injection process, which seriously affects the formation, combustion and emission of the mixed gas in the engine. [3-5] . Therefore, the study of spray wall impingement characteristics is very important, and it is one of the key factors affecting engine performance. In recent years, scholars at home and abroad have conducted a lot of research on spray and spray wall impact characteristics. [6-8] . In the research process, for a large number of images of spray impingement walls with complex structures and blurred boundaries unde...

Claims

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Application Information

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IPC IPC(8): G06T7/00G06T7/62G06T7/194G06T7/136G06T7/13G06T5/00
CPCG06T7/0004G06T7/62G06T7/194G06T7/136G06T7/13G06T5/002G06T2207/20032
Inventor 商微微于秀敏董伟邢笑雪董朔
Owner CHANGCHUN UNIV
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