搭载可变气门机构的柴油机二冲程制动性能

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Two-stroke braking performance of diesel engine equipped with variablevalvemechanism

ZHANG Xu1.2，TANHuiying1，WU Weihai2，XIE Zongfa*1.2 （1.SchoolofechancalEngineering，ndongUnversityinan5o6l，ia；2.KeyLboratorgh EfficiencyandCleanachineryanufacturingofhandongUniversitynanoo6l，hina；3.Weiangelipu Equipment Safety TechnologyCo.，LTD.，Weifang26l200，China）

Abstract：To address the issue of excessive driving system load caused by high valve opening pressure during two-stroke braking in heavy-duty diesel engines，this study proposesan integrated hydraulic variable mode valve system （HVMVS）capable of dynamic valve motion patern switching.Asix-cylinder diesel engine simulation model was established using GT-Power software to investigate optimal valve operation parameters thatachieved high braking torque while maintaining low maximumcylinder pressure.Brake performance analysiswasconducted across different rotational speedsfordiesel enginesequipped with HVMVS，including comparative evaluations with conventional variable valve systems.The resultsshow thatat rated engine speed， the HVMVS-equipped two-stroke braking system generates 1158 Nm effective braking torquewith a maximum cylinder pressure of 2.3M P a leadingtoa 62% reduction compared to alternative systems.The HVMVS demonstrates significantadvantages in mitigating both maximum in-cylinder pressureand drive mechanism load duringtwo-strokebraking operations，therebyenhancing operational reliability.These findings indicate promising application prospects for HVMVS in heavy-duty engine applications.

Keywords：vehiclesafety；exhaustbraking technology；variablevalvedrivesystem； fulyhydraulic variable valve system； two-stroke braking technology

公路交通运输一直占据中国运输行业中的主导地位，由于重型商用车辆行车制动器热失效问题导致的公路交通事故频频发生，严重影响了公路交通安全[1-4]。（剩余10521字）