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Evaluation and Correction Method of Diesel Engine Emission Cycle Test Results

A technology of cyclic testing and result evaluation, applied in mechanical equipment, exhaust devices, exhaust gas treatment, etc., can solve the problems of inability to accurately and comprehensively evaluate the emission results, not taking into account the influence of NOx conversion efficiency and urea utilization rate, etc.

Active Publication Date: 2020-01-03
WEICHAI POWER CO LTD +1
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Problems solved by technology

[0007] The above two methods do not take into account the impact of the actual NOx conversion efficiency and urea utilization rate after the change of the ratio of ammonia gas to NOx gas (ammonia-nitrogen ratio) that actually participates in the reaction after the NOx change of the original machine, and cannot accurately and comprehensively evaluate the emission results. evaluation of

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  • Evaluation and Correction Method of Diesel Engine Emission Cycle Test Results
  • Evaluation and Correction Method of Diesel Engine Emission Cycle Test Results
  • Evaluation and Correction Method of Diesel Engine Emission Cycle Test Results

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Embodiment Construction

[0038] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0039] The invention provides a diesel engine emission cycle test result evaluation method, including analyzing the specific emission results of each pollutant in the SCR post-treatment system, and then evaluating the performance of components such as the SCR urea injection system and packaging structure design.

[0040] Taking the steady-state test as an example, during the specified steady-state test cycle, the output power of the...

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Abstract

The invention provides a diesel engine emission circulation testing result evaluating and correcting method used for evaluating the treatment effect for diesel engine exhaust pollutants through an SCRcatalysis silencer. The evaluating method comprises the steps that the specific emission result of various pollutants is obtained, and the pollutant treatment effect is evaluated according to the specific emission result. The correcting method comprises the steps that firstly, the urea utilization rate of a catalyst adopted in the ith work condition point under different ammonia nitrogen ratios,different emission temperatures and different air speeds is obtained through sample or bench test calculation; secondly, according to the different ammonia nitrogen ratio, emission temperature and airspeed conditions during development and verification testing, the urea utilization rate and the correction coefficient at the ith work condition point during development and verification are obtainedaccording to the catalyst urea utilization rate; and thirdly, according to the correction coefficient, the NOx emission concentration of the ith work condition point after SCR posttreatment system treatment during verification testing is corrected. By means of the diesel engine emission circulation testing result evaluating and correcting method, the treatment effect on the diesel engine exhaustpollutants through the SCR catalysis silencer can be objectively evaluated.

Description

technical field [0001] The invention relates to the technical field of engine SCR post-processing, in particular to a method for evaluating and correcting diesel engine emission cycle test results. Background technique [0002] When carrying out bench verification of SCR injection system, packaging and other post-processing related assessment parts, it is often caused by different bench systems or different prototypes that the original NOx There are still differences between the concentration and the development status. These differences will directly affect the NOx emission results after the aftertreatment system, which is not conducive to making accurate judgments on the catalytic muffler, injection system and other related aftertreatment assessment parts. [0003] At present, there is no unified technical solution, and there are two common processing methods: one is to compare the NOx conversion efficiency of the two tests before and after the two test results, and then j...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N3/20F01N9/00
CPCF01N3/2073F01N3/208F01N2570/14F01N2610/02F01N2900/0412Y02T10/12Y02T10/40
Inventor 王军王孝莉杨晴晴耿磊
Owner WEICHAI POWER CO LTD
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