柴油机可靠性水平评估与分析

Evaluation and Analysis of the Reliability of Diesel Engines

以某重型商用柴油机为例,以大量用户维修数据为信息源,分析了衡量柴油机可靠性的典型参数,包括里程、失效数、失效部件、失效季节以及平均无故障间隔里程等,评估了发动机的可靠性及其影响因素。结果表明,降低大载荷周期性运动件的失效数是改善商用柴油发动机可靠性的关键。研究还发现,该型柴油机的平均无故障里程较高,失效数较低,早期失效率虽然高于寿命期内的平均失效率,但相应的故障性质比较轻微,说明该型柴油机的可靠性已经具有较高水平。

A certain commercial heavy duty diesel engine was taken as an example to analyze the typical parameters on evaluating the reliability of engines,including mileage,failure times,failure parts,failure season and MKB,which were based on large number of maintenance database from users.The results showed that reducing the failure times of the moving parts under high cyclic load was the key point to improve the reliability of commercial diesel engine.Moreover,it was found that this type of diesel engine featured longer MKB and less failure times,and though the earlier failure rate was higher than the average failure rate across the whole service life,and the relative failures were always minor ones,which means this type of diesel engine boast relatively high reliability.