Fault Tree Analysis on Power Deficiency of Heavy Duty Truck Diesel Engine

To diagnose the fault causes of power deficiency of heavy duty truck diesel engine,the specific fault tree is established and the comprehensive analysis of the tree is carried out.With the qualitative analysis of fault tree,a variety of possible causes and their combinations of engine power deficiency are given,where a number of factors including the man-machine-environment are involved.The minimal cut sets obtained by qualitative analysis,as well as the important degree of each direct cause to the top event,can guide the maintenance staff to quickly and accurately find the cause created the top event and eliminate the fault timely,thus greatly reducing the fault diagnosis and troubleshooting time.Using the computer programs and the occurrence probability of given bottom events,quantitative calculation of the top event probability and the important degree of each bottom events are carried out.The results will help to further improve the scientific and technological content of the vehicle maintenance and repair quality,and help to design and manufacture units to take corrective measures to improve the use reliability of the engine.