Control Strategy Research and Software Design of Diesel Engine SCR System

LI Jiehui; HU Li; DUAN Chang; LIU Jing; ZHANG Longji

doi:10.3969/j.issn.1001-2222.2018.03.012

Vehicle Engine ›› 2018, Vol. 0 ›› Issue (3) : 72-76. DOI: 10.3969/j.issn.1001-2222.2018.03.012

Control Strategy Research and Software Design of Diesel Engine SCR System

LI Jiehui,HU Li,DUAN Chang,LIU Jing,ZHANG Longji

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Abstract

In order to reduce NO_xemission of diesel engine effectively, the SCR control software was developed under the Matlab/Simulink environment combined with the modular design idea. The software mainly included data management module, SCR state module, urea calculation module and task module and wherein the urea calculation module used the mixed methods of fundamental urea injection calculation, urea injection correction and close loop feedback to improve the urea calculation accuracy. The software codes were generated and written into the SCR controller DCU and tested through the ESC and WHTC cycle tests on the test bench. The results showed that NO_x conversion efficiency in ESC and WHTC tests was more than 79.09% and 72.35% respectively. Their NO_xemissions were lower than 1.836 g/(kW· h) and 2.147 g/(kW·h) after the catalytic reduction, which meet the limit requirement of China Ⅴ regulations.

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diesel engine / SCR / control strategy / software design / modular design

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LI Jiehui,HU Li,DUAN Chang,LIU Jing,ZHANG Longji. Control Strategy Research and Software Design of Diesel Engine SCR System[J]. Vehicle Engine. 2018, 0(3): 72-76 https://doi.org/10.3969/j.issn.1001-2222.2018.03.012