DPF载体环裂故障分析
杨海龙1，2，辛欣2，郑志强2，杨永春1，2，刘斌1，2，刘阳1，2，刘波1，2
1.内燃机可靠性国家重点实验室，山东 潍坊 261061;2.潍柴动力股份有限公司，山东 潍坊 261061
摘要：为解决柴油机颗粒捕集器（diesel particulate filter，DPF）载体环裂故障，以2台编号分别为A、B的柴油机为试验对象，柴油机A在全球统一瞬态试验循环（world harmonized transient cycle，WHTC）工况下积碳后进行再生试验和降怠速（drop-to-idle，DTI）再生试验，分析不同积碳循环和不同再生设定温度下DPF内部各测点的温度变化；对柴油机B进行热冲击试验和WHTC工况下无积碳再生试验，分析再生过程中DPF内部各测点的温度变化。试验结果表明：碳载量分布不均匀和再生设定温度较高是导致DPF载体环裂故障的主要原因。通过控制DPF再生起燃速度，将再生设定温度由600 ℃降至560 ℃，碳载量控制在4.5 g/L以内，在有阶梯再生的情况下，DPF内部温度峰值和温度梯度均正常，可降低DPF载体环裂风险，提高DPF使用的可靠性。
关键词：柴油机；DPF；载体环裂；再生温度；碳载量
Fault analysis on ring crack of DPF carrier
YANG Hailong1,2, XIN Xin2, ZHENG Zhiqiang2, YANG Yongchun1,2,
LIU Bin1,2, LIU Yang1,2, LIU Bo1,2
1.State Key Laboratory of Engine Reliability, Weifang 261061, China;
2.Weichai Power Co.,Ltd.，Weifang 261061, China
Abstract:To solve the ring crack fault of diesel particulate filter(DPF) carrier, two diesel engines numbered A and B respectively are taken as test objects. Regeneration test and drop-to-idle（DTI）test of diesel engine A after carbon deposition are carried out under the working condition of world harmonized transient cycle（WHTC）, which are used to investigate the temperature change of various measuring points within DPF for different carbon deposition cycles and regeneration set temperatures. Regeneration test without carbon deposition under the working condition of WHTC and thermal shock test of diesel engine B are carried out, which are used to analyze the temperature change of various measuring points within DPF during the process of regeneration. The test results show that the uneven distribution of carbon load and high regeneration set temperature are the main reasons for the ring crack of DPF carrier. By controlling the ignition rate of DPF regeneration, the calibration value of regeneration set temperature can be decreased from 600 ℃ to 560 ℃, and the carbon load can be controlled within 4.5 g/L. In the case of stepped regeneration, the internal temperature peak and temperature gradient of DPF are normal, which can reduce the risk of ring cracking of DPF carrier and improve the service reliability of DPF.
Keywords:diesel engine; DPF; ring crack of carrier; regeneration temperature; carbon load
