Automatic continuous sampling spark plug and sampling system for combustion product in engine cylinder

Abstract

The invention relates to a technology for preparing a sample for a test, further relates to an automatic continuous sampling spark plug and sampling system for a combustion product in an engine cylinder. The automatic continuous sampling system for the combustion product in the engine cylinder comprises a sampling spark plug 1, a sampling branch, a nitrogen diluting branch, a collection branch, a collection device 4, a sampling electromagnetic valve 3, a diluting electromagnetic valve 5, a diluting flow meter 6, a sampling flow meter 7 and an electronic control unit 8, wherein the sampling branch is connected with the sampling spark plug 1; the nitrogen diluting branch is used for carrying out dilution on the combustion product in the sampling branch; the collection branch and the collection device 4 are used for collecting the diluted combustion product; the sampling electromagnetic valve 3 is located on the sampling branch; the diluting electromagnetic valve 5 and the diluting flow meter 6 are located on the diluting branch; and the sampling flow meter 7 is located on the collection branch. The sampling system provided by the invention is communicated with an air cylinder through the spark plug, and is simple in installation technology and high in universality.

Description

Technical field: [0001] The invention relates to a technology for preparing samples for testing, and further relates to a spark plug and a sampling system for automatic and continuous sampling of combustion products in engine cylinders. Background technique: [0002] The combustion emissions of automobile engines are an important part of the pollution source of the atmospheric environment. At present, in order to fundamentally solve this increasingly prominent environmental problem, more and more engine technology researchers have begun to realize the harmful effects on the engine during work. The importance of basic research work on the mechanism of gas and particulate matter generation and emission control technology, for which it is necessary to rely on a sampling system that can obtain combustion products or combustion intermediate products in the cylinder at a specific moment in the combustion process of the engine cylinder; while the existing sampling system Most of th...

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Problems solved by technology

[0002] The combustion emissions of automobile engines are an important part of the pollution source of the atmospheric environment. At present, in order to fundamentally solve this increasingly prominent environmental problem, more and more engine technology researchers have begun to realize the harmful effects on the engine during work. The importance of basic research work on the generation mechanism of gas and particulate matter and emission control technology must be based on a sampling system that can obtain combustion products or combustion intermediate products in the cylinder at a specific moment in the combustion process of the engine cylinder; and the existing sampling system Most of them are connected to the exhaust port of the engine, and can only obtain the final emission products after complete combustion in the engine cylinder. Researchers cannot obtain and study the material changes that occur during the combustion process in the cylinder. For example, the patent document CN1834609A discloses fast point sampling in the cylinder of the internal combustion engine Although the system can collect the products in the combustion process of the engine at any time, the sampling needs to pass through a special sampling valve. The sampling valve is installed through the installation hole on the cylinder. Not only the installation process is complicated, but the versatility is not strong. The mounting hole is easy to damage the sealing of the cylinder and affect the working performance of the engine

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