Performance testing method and system for diesel oxidation catalyst (DOC)

Abstract

The invention provides a performance testing method for a diesel oxidation catalyst (DOC). The performance testing method for the diesel oxidation catalyst (DOC) comprises the following steps that the concentration of hydrocarbon in tail gas exhausted by an engine is adjusted to the preset concentration; the tail gas which is adjusted to the preset concentration is pumped into the DOC, and catalytic conversion is performed on the hydrocarbon and carbon monoxide in the tail gas through the DOC; the inlet temperature and the outlet temperature of the DOC when the tail gas passes through the DOC are measured; the catalytic conversion characteristics of the DOC on the hydrocarbon and the carbon monoxide in the tail gas at the current inlet temperature are obtained according to the temperature difference between the outlet temperature and the inlet temperature of the DOC. According to the embodiment of the performance testing method for the diesel oxidation catalyst (DOC), a performance curve of the diesel oxidation catalyst (DOC) can be easily, accurately and objectively tested. The invention further provides a testing system for the diesel oxidation catalyst (DOC).

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to a performance testing method and system of a diesel oxidation catalytic converter DOC. Background technique [0002] Energy saving and environmental protection are the most important goals and requirements in the development of advanced engines. In order to meet higher emission regulations, in addition to improving engine combustion, optimizing engine control and other in-cylinder purification technologies, advanced exhaust post-treatment technologies are also required. Among them, DOC (diesel oxidation catalyst) is one of the technologies widely used in diesel engines. Accurate testing and evaluation of DOC performance is a key link in the development of engine emission control, and it is also a basic test for matching calibration of exhaust aftertreatment systems. DOC The performance is mainly manifested in the catalytic conversion efficiency of HC (hydrocarbons) and CO (ca...

AI Technical Summary

Problems solved by technology

[0004] The existing DOC performance evaluation equipment has the following disadvantages, a dual-channel gas emission analyzer is required, and the emission analyzer needs to be calibrated before the test

It greatly increases the construction cost of the test system, and also brings large use and maintenance costs. At the same time, because the emission analyzer requires more auxiliary systems, it limits the use of this technology.

In addition, the existing diesel engine adopts an advanced combustion system, and the concentration of HC / CO gas in the exhaust emission is very low, only on the order of tens of ppm, which is affected by engine fluctuations and the test progress of the emission analyzer. Efficiency repeatability and accuracy are poor (in traditional TWC performance evaluation, the concentration of gas emissions is usually on the order of thousands of ppm)

In addition, the working environment and principle of diesel engine DOC and gasoline engine TWC are different, and the use of TWC performance evaluation equipment and methods to evaluate DOC performance is not very convincing

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