Electric heating technology study on the after-treatment of a heavy-duty diesel engine
GENG Zongqi
BAI Shuzhan
ZHONG Kun
LÜ Zhihua
Abstract：In order to increase exhaust temperature,shorten the ignition time of selective catalytic reduction(SCR)system,and reduce cold emissions of heavy-duty diesel engines,an electric heater is added to the after-treatment system of heavy-duty diesel engine with a displacement of 13 L.Temperature measurement tests are conducted under steady-state and cold world harmonized transient cycle(WHTC),and emission tests are conducted under cold-state WHTC with electric heater power of 5.4 and 7.2 kW respectively.The results show that under steady-state conditions,when the power of the electric heater is stable,the increase in exhaust temperature is inversely proportional to the engine exhaust flow rate.In the cold-state WHTC cycle,the greater the electric heating power,the better the heating effect,the shorter the ignition time of the SCR,and correspondingly,the higher the energy consumption.The judgment condition for turning off the electric heater is that the upstream temperature of the SCR reaches the ideal temperature.Compared with the unheated state,the NOx emissions of the two cold-state WHTC tests with electric heater power of 5.4 kW and 7.2 kW decreased by 49%and 52%respectively,and the fuel consumption increased by 2.6%and 3.6%respectively.
Keywords：diesel engineemissionelectric heaterNOxfuel consumption
Publication Date：2024-12-28
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：7( 76-82 )