A method for calculating brake specific emission of SCR catalytic muffler during transient circulation test

A catalytic muffler and cycle test technology, which is applied in the exhaust aftertreatment of the engine and the field of the engine, can solve the problems of accurate judgment and inability to compare and evaluate the performance of the unfavorable catalytic muffler.

Active Publication Date: 2017-06-13
WEICHAI POWER CO LTD +1
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Problems solved by technology

Therefore, each time the transient test is carried out on different test benches and different diesel engines, the emission results will be affected by the difference in exhaust temperature and space velocity during the actual cycle process, which is not conducive to making an accurate judgment on the performance of the catalytic muffler. It is also impossible to objectively compare and evaluate the results of different tests before and after

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  • A method for calculating brake specific emission of SCR catalytic muffler during transient circulation test
  • A method for calculating brake specific emission of SCR catalytic muffler during transient circulation test
  • A method for calculating brake specific emission of SCR catalytic muffler during transient circulation test

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[0032] 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.

[0033] According to an embodiment of the present invention, a method for calculating the specific emission of an SCR catalytic muffler in a transient cycle test, the method includes the following steps:

[0034] S1: According to the temperature and airspeed distribution of the operating point in the transient cycle, the exhaust temperature and airspeed are taken as the horizontal and vertical coordinates respectively, and the entire...

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Abstract

The invention provides a method for calculating brake specific emission of an SCR catalytic muffler during a transient circulation test. According to the method, working conditions of transient circulations (ETC, WHTC) are regionally divided with temperature exhaustion and airspeed as coordinates, the number of working condition points distributed in each region is compared with that when developed, a correction coefficient is determined, an emission result that can better represent actual ability of the catalytic muffler is obtained by the correction of the weight of the working condition points in each region in the circulation, and therefore treatment capability of the catalytic muffler to NOx in exhaust gas is evaluated more accurately.

Description

technical field [0001] The invention relates to the field of engines, in particular to the technical field of engine exhaust aftertreatment. Background technique [0002] The transient test cycle is an important assessment item to evaluate that diesel engines and SCR catalytic mufflers meet the requirements of National IV, National V and higher emission regulations. Among them, China IV and National V stages usually require ETC emission cycles, and urban National V and higher emissions stage requires a WHTC cycle. Taking ETC as an example, the regulations stipulate the speed specification value and torque specification value of each working point in the transient cycle. The actual speed and actual torque of each working point can be obtained from the reference speed and the transient performance measurement curve corresponding to the actual speed. The torque value is calculated. The reference speed, maximum torque, etc. will have certain deviations due to the state of the ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
CPCG16Z99/00
Inventor 王军王孝莉安丽花杨晴晴
Owner WEICHAI POWER CO LTD
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