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    • Influences of Exhaust Pressure Fluctuation on the Two-Stroke Compression Release Brake Performance of An Engine
    DOI：10.13949/j.cnki.nrjgc.2024.01.010
    Key Words:two-stroke braking  compression release braking（CRB）  brake gas recirculation（BGR）  inlet pressure  exhaust pressure  design of experiment（DoE）
    Author NameAffiliationPostcode
    OUYANG Yuru School of Automotive Studies， Tongji University， Shanghai 201804， China 201804
    NI Jimin School of Automotive Studies， Tongji University， Shanghai 201804， China 201804
    LIU Yong School of Automotive Studies， Tongji University， Shanghai 201804， China 201804
    HUANG Rong School of Automotive Studies， Tongji University， Shanghai 201804， China 201804
    QIAO Hanping School of Automotive Studies， Tongji University， Shanghai 201804， China 201804
    YIN Sheng School of Automotive Studies， Tongji University， Shanghai 201804， China 201804
    SHI Xiuyong School of Automotive Studies， Tongji University， Shanghai 201804， China 201804
    OU Cheng School of Automotive Studies， Tongji University， Shanghai 201804， China
    Schaeffler Trading （Shanghai） Co.， Ltd.， Shanghai 201804， China     		201804
    TANG Tian Schaeffler Trading （Shanghai） Co.， Ltd.， Shanghai 201804， China 201804
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    Abstract:In order to analyze the influence of exhaust pressure fluctuation on two-stroke compression release brake power， taking a heavy-duty diesel engine as the research object， GT-Power software was used to establish one-dimensional model of engine two-stroke compression release brake. Through modifying the exhaust value lift， the influence of exhaust pressure fluctuation on braking performance was studied. The results show that the pressure fluctuation during the phase of the second compression release braking （2nd CRB） would affect the exhaust gas return flow of other cylinders， which affects the braking power of the engine. The three-dimensional flow field of the exhaust pipe was further calculated， and proved the influence of the pressure wave transmission when the exhaust valve was opened in the 2nd CRB phase of other cylinders on the exhaust return in the brake gas recirculation（BGR） phase. Finally， the exhaust pipe geometry was optimized by using the design of experiment （DoE）， combined with the response surface fitting and particle swarm optimization algorithm. The optimal braking power of the diesel engine can reach 395.08 kW at 2 100 r/min under two-stroke breaking mode.
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