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    • Research on the Phenomenon of Low-Frequency Oil Pressure Fluctuation of Diesel Engine Lubrication System
    DOI：10.13949/j.cnki.nrjgc.2022.05.014
    Key Words:diesel engine  lubrication system  low-frequency fluctuation  damping hole
    Author NameAffiliationE-mail
    LI Jianwen* State Key Laboratory of Engine Reliability， Weifang 261061， China
    R &
    D Center， Weichai Power Co.， Ltd.， Weifang 261061， China     		lijianw@weichai.com 
    SHEN Jiawei State Key Laboratory of Engine Reliability， Weifang 261061， China
    R &
    D Center， Weichai Power Co.， Ltd.， Weifang 261061， China     		 
    LIU Yang* State Key Laboratory of Engine Reliability， Weifang 261061， China
    R &
    D Center， Weichai Power Co.， Ltd.， Weifang 261061， China     		liuyang13@weichai.com 
    ZHANG Zhiquan State Key Laboratory of Engine Reliability， Weifang 261061， China
    R &
    D Center， Weichai Power Co.， Ltd.， Weifang 261061， China     		 
    WANG Chao State Key Laboratory of Engine Reliability， Weifang 261061， China
    R &
    D Center， Weichai Power Co.， Ltd.， Weifang 261061， China     		 
    CUI Yong State Key Laboratory of Engine Reliability， Weifang 261061， China
    R &
    D Center， Weichai Power Co.， Ltd.， Weifang 261061， China     		 
    TIAN Shaocong State Key Laboratory of Engine Reliability， Weifang 261061， China
    R &
    D Center， Weichai Power Co.， Ltd.， Weifang 261061， China     		 
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    Abstract:Based on a diesel engine lubrication system with post-pump releasing pressure regulation through oil signal feedback in the main oil channel， the frequency spectrum of high frequency pressure fluctuation data was analyzed and the transient states of pump and valve were simulated. It was demonstrated that the main cause of low-frequency fluctuation was the vibration instability of the valve spool during pressure regulation process. The range of low-frequency fluctuation was generally 20 Hz~30 Hz， and the fluctuation amplitude accounted for 50%~80% of the overall pressure fluctuation amplitude. Low-frequency oil pressure fluctuations can be attenuated or even eliminated by setting damping holes in the signal oil channel， which can reduce the influence of pressure fluctuation on engine operation reliability effectively.
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