机电工程技术Issue(10)：76-80,5.DOI:10.3969/j.issn.1009-9492.2014.10.021
基于瞬时转速的柴油机早期弱故障诊断实验研究
The Experiment Research on Early Weak Diesel Fault Diagnosis Based on Instantaneous Speed
孙云岭 1田洪祥 1王胜杰1
作者信息
- 1. 海军工程大学动力工程学院，湖北武汉 430033
- 折叠
摘要
Abstract
Instantaneous speed signal included much working status information of diesel, and it has been used in severe misfire fault diagnosis successfully, but there is still lack of further research on early weak fault diagnosis. In this paper, several early faults are simulated in 6-135 type diesel through adjust cylinder fuel eject quantity, adjust exhaust valve clearance, simulate exhaust valve leak in differ degree. Experiment data is acquired at different running status, and instantaneous speed signal of diesel is calculated. Through analyzing the change rule of instantaneous speed signal in different status, it is found that the diesel instantaneous speed signal could be used in several early fault diagnosis, and the instantaneous speed unitary rise amplitude ratio P of every cylinder is a direct character parameter. At normal status, P value of every cylinder are in the range of 0.9~1.1. If the P value of certain cylinder descend over 10%, then it could be think as a fault cylinder. The method is sensitive to some fault which could influence gas press in cylinder such as fuel eject quantity not uniformity and valve leaking, and it is not sensitive to some fault which couldn’t influence gas press in cylinder such as cylinder liner wear.关键词
柴油机/瞬时转速/故障诊断Key words
diesel/instantaneous speed/fault diagnosis分类
能源科技引用本文复制引用
孙云岭,田洪祥,王胜杰..基于瞬时转速的柴油机早期弱故障诊断实验研究[J].机电工程技术,2014,(10):76-80,5.
