Study on the Effect of Valve Train Parameters on Increasing the Vehicle Diesel Torque at Low Speed Condition

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• 英文论文题名：Study on the Effect of Valve Train Parameters on Increasing the Vehicle Diesel Torque at Low Speed Condition
• 论文作者：Yuan Zhaocheng ; Chen Haibo ; Qiu Sen ; Jin Yihe ; Liu Hongtao ; Ju Mingjun
• 英文论文作者：Yuan Zhaocheng ; Chen Haibo ; Qiu Sen ; Jin Yihe ; Liu Hongtao ; Ju Mingjun ; State Key Laboratory of Automotive Simulation and Control ; Jilin University ; FAW Sihuan Engine Manufacture Co. ; Ltd.
• 年：2016
• 作者机构：State Key Laboratory of Automotive Simulation and Control,Jilin University;FAW Sihuan Engine Manufacture Co.,Ltd.;
• 英文论文关键词：high speed diesel ; cam profiles ; valve timing ; torque
• 会议召开时间：2016-10-26
• 会议录名称：2016中国汽车工程学会年会论文集
• 英文会议录名称：Proceedings of 2016 SAE-China Congress
• 语种：英文
• 分类号：U464.172
• 学会代码：QCGC
• 会议名称：2016中国汽车工程学会年会暨展览会
• 会议地点：中国上海
• 主办单位：中国汽车工程学会
• 学会名称：中国汽车工程学会
• 页数：9
• 文件大小：1437k
• 原文格式：O
• 会议级别：全国

摘要

In Parameters of valve trains,such as cam profiles and valve timing,have very important influence on power output and economical efficiency of internal combustion engine.For increasing the torque of a domestic- produced diesel engine at low speed condition,it is analyzed in details the valve timing,the static and dynamic characteristics of cam profiles in the original roller-arm valve mechanism system.Comparing the parameters with the other same type diesel engines,three improved projects of cam are proposed and compared by simulation model which has been verified by experimental data.Both cam profiles of High- order Polynomial Functions type and Low- order Polynomial Combination Functions type are applied to the design process by using the self- developed cam design software.Several factors should be considered in the design process of engine valve trains,however,among which the valve timing and the fullness coefficients of cam profiles are the most two important factors.With the constraint condition of the fullness coefficients value of cam profiles must be bigger than 0.55 and the minimum value of negative curvature radius must be bigger than the radius of grinding wheel used during the manufacture process,the project of Low- order Polynomial Combination Functions type profiles are selected to be the optimized one.Through the engine test verification and validation,the torque of the optimized engine increases over 11% and the fuel consumption decreases by 2.34% at low speed condition.
In Parameters of valve trains,such as cam profiles and valve timing,have very important influence on power output and economical efficiency of internal combustion engine.For increasing the torque of a domestic- produced diesel engine at low speed condition,it is analyzed in details the valve timing,the static and dynamic characteristics of cam profiles in the original roller-arm valve mechanism system.Comparing the parameters with the other same type diesel engines,three improved projects of cam are proposed and compared by simulation model which has been verified by experimental data.Both cam profiles of High- order Polynomial Functions type and Low- order Polynomial Combination Functions type are applied to the design process by using the self- developed cam design software.Several factors should be considered in the design process of engine valve trains,however,among which the valve timing and the fullness coefficients of cam profiles are the most two important factors.With the constraint condition of the fullness coefficients value of cam profiles must be bigger than 0.55 and the minimum value of negative curvature radius must be bigger than the radius of grinding wheel used during the manufacture process,the project of Low- order Polynomial Combination Functions type profiles are selected to be the optimized one.Through the engine test verification and validation,the torque of the optimized engine increases over 11% and the fuel consumption decreases by 2.34% at low speed condition.

引文

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