A kind of measurement method of engine combustion exhaust particle number

A measurement method and engine technology, applied in the field of measurement, can solve the problems of high price, complex measurement equipment, inability to reflect the particle size of a single particle, etc., and achieve the effect of a simple measurement device

Active Publication Date: 2015-12-09
JIANGSU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These three measurement methods all indirectly obtain the particle size and quantity through the conversion of electrical signals. The obtained particle size results are mainly the particle size of the particle group, which cannot reflect the individual particle size formed by combustion, and the measurement equipment is complicated. expensive

Method used

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  • A kind of measurement method of engine combustion exhaust particle number
  • A kind of measurement method of engine combustion exhaust particle number
  • A kind of measurement method of engine combustion exhaust particle number

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Experimental program
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Embodiment Construction

[0050] specific implementation plan

[0051] Describe the present invention below in conjunction with specific embodiment:

[0052] Step 1: Collect samples of particles to be tested;

[0053] The engine combustion particles in the main exhaust passage of the engine are collected by a filter membrane as the particle sample to be tested; in this embodiment, a glass fiber filter membrane is used, the sampling flow rate is controlled at 5 L / min, and the sampling time is 10 minutes.

[0054] Before the dispersion treatment, the electron microscope image of engine combustion particles is as follows figure 1 As shown, the particles are agglomerated together in the form of chains, clusters, and flocs, and it is difficult to measure the number of particles.

[0055] Step 2: Dispersion treatment of the particle sample to be tested;

[0056] Use ethanol or dichloromethane solution to extract the particle sample to be tested, the amount of solvent added is 5 times the mass of the particl...

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Abstract

The invention relates to the technical field of measurement and provides a method for measuring the particle number of the exhaust gas of a spark ignition engine or a compression ignition engine. The method for measuring the particle number of the combustion exhaust gas of an engine mainly comprises the following steps: collecting particle samples to be measured; dispersing the particle samples to be measured; acquiring an electron microscope image of dispersed particles; judging the dispersion degree of agglomerated particles; determining the number of inflection points and the number of arcs; eliminating particles with over-large number of the inflection points and over-large number of the arcs; and judging the number of single particles in Mi to finally obtain the particle number Nsum of the combustion exhaust gas of the engine. Compared with the prior art, the method has the characteristics that a measurement device is simple; and the particle number can be intuitively obtained without current conversion.

Description

technical field [0001] The invention relates to the field of measurement technology, and provides a method for measuring the number of exhaust particles of an ignition engine or a compression ignition engine. Background technique [0002] Particulate matter (PM) emitted from automobile engines has become one of the main sources of atmospheric environmental pollutants. In 2013, Beijing has implemented the "Beijing V" emission standard for automobiles, and the "National IV" emission standard for automobiles will be implemented nationwide. In the more stringent emission regulations, in addition to the limitation on the quality of particulate matter emitted by vehicles, the limitation requirements on particle number (particulate number, PN) are also added. Engine particles can be divided into coarse state (1-10μm), aggregated state (100-300nm) and nuclear state (particle size less than 50nm) according to particle size. Studies by scholars at home and abroad have shown that the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/10
Inventor 王忠李铭迪王宇成赵洋刘帅李瑞娜毛功平
Owner JIANGSU UNIV
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