Journal of Jilin University(Engineering and Technology Edition) ›› 2020, Vol. 50 ›› Issue (2): 408-416.doi: 10.13229/j.cnki.jdxbgxb20181240

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Heating characteristics of DOC based on exhaust thermal management of diesel engine

Jian WANG1(),Xin XU1,Han GU1,Duo-jun ZHANG2,Sheng-ji LIU1   

  1. 1.School of Automotive and Traffic Engineering，Jiangsu University, Zhenjiang 212013，China
    2.Wuxi Wabertec Automobile Technology Co. , Ltd. ，Wuxi 214000，China
  • Received:2018-12-15 Online:2020-03-01 Published:2020-03-08

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Abstract:

Diesel engines have been widely applied in the fields of transportation and manufacturing due to their advantages such as good power, economy and reliability, but the subsequent pollutant emissions are increasingly serious. Among them, the particular emissions seriously pollute the environment and endanger human health. As emission regulations are becoming gradually stricter, the after-treatment technology to control particulate emission has been a hot spot for research. Diesel Particulate Filter (DPF) has been proved to be the most effective after-treatment equipment to control diesel particulate emission, but the regeneration method and strategy of DPF are the key technical questions. DPF regeneration technology generally includes active regeneration and passive regeneration. Active regeneration has become the mainstream of DPF regeneration method due to its completeness and safety. The precise control of DPF regeneration temperature is the key to its thoroughness and safety. In order to study the influence of exhaust thermal management measures on the heating characteristics of Diesel Oxidation Catalyst (DOC) and other engine performances during DPF regeneration of diesel engine, two typical working condition modes at low speed and medium-light load (working condition 1 was 1 250 r/min and 25% load, working condition 2 was 1 250 r/min and 40% load), which had low exhaust temperature, were selected to research. The test results show that increasing late post injection quantity has little effect on the exhaust temperature at the entrance of DOC. The heating rate inside DOC is increased and the time of peak heating rate is shortened, and the heavier the load the more obvious the effect. The conversion efficiency of hydrocarbon (HC) is improved but HC emissions deterioration is obvious, Brake Specific Fuel Consumption (BSFC) and oil dilution are worsened. Therefore, the late post injection quantity should be controlled reasonably. When the intake throttle opening is reduced, the air intake mass flow is decreased, the exhaust temperature at DOC inlet is increased, the heating response is slowed but the peak of heating rate is higher. The peak temperature appeares at middle and posterior of DOC during heating process. The experimental results and conclusion lay experimental foundation for DPF active regeneration method and strategy.

Key words: power machinery and engineering, exhaust thermal management, diesel engine oxidation catalyst, heating characteristics

CLC Number: 

  • TK421

Table1

Basic parameters of prototype"

项目技术参数
结构形式直列、4缸、4气门、高压共轨燃油系统
缸径×行程/mm×mm95×87.4
总排量/L2.5
压缩比17
标定功率/kW90
标定转速/（r·min-1）3 600

Fig.1

Schematic diagram of test bench"

Table2

Basic parameters of after-treatment device"

项目DOCDPF
载体材料堇青石碳化硅
载体尺寸/mm×mm118.4×?152.4143.8×?177.8
孔目数/cpsi400300
催化剂密度/（g.cm-3）0.310.76
贵金属种类Pt/PdPt/Pd
外部形状圆柱体圆柱体

Fig.2

Layout of thermocouples inside DOC"

Fig.3

Effect of late post injection quantity on inlet and outlet temperature of DOC"

Fig.4

Different temperature inside DOC"

Fig.5

Temperature rise rule inside DOC(working condition 2)"

Fig.6

Effect of late post injection quantity on heating characteristic of DOC"

Fig.7

Effect of late post injection quantity on HC emission and HC conversion efficiency"

Fig.8

Effect of late post injection quantity on BSFC and power"

Fig.9

Measurement of excess air coefficient"

Fig.10

Effect of late post injection quantity on fuel loss rate"

Fig.11

Effect of intake throttle valve opening on exhaust flow and DOC inlet temperature"

Fig.12

Effect of intake throttle valve opening on heating characteristic of DOC"

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