Conventionally , the valve timing and lift have been scheduled before production , optimized for the standard condition and circumstances . most of the devices used in engines to open and to close intake and exhaust valve do not permit variation of valve timing and duration during engine operation . but the engine usually operates in a non - standard condition and ca n ' t be optimized as in standard condition 传统气门驱动系统通常只能保证在某一工况优化发动机的性能，其凸轮型线在出厂时即已经固定，无法在运行的过程中进行调节，因此这种气门驱动系统具有一定局限性，它使得发动机的性能难以在各种工况下都达到优化。
According to the characteristics of the overhead camshaft valve train , the author thoroughly analyzed the kinematics and dynamics concerned in the design of valve train cam profile . the results illuminate the influence of valve timing , ample factor as well as the contact stress between cam and tappet on the design of cam profile 根据顶置凸轮轴式配气机构的特点，文章深入分析了在配气凸轮型线设计中必须涉及的运动学及动力学问题，说明了配气定时、丰满系数及凸轮与挺柱间接触应力对凸轮型线设计的影响。
The design technique and design model of cam curve law with multiple - index restrictions a re given and a typical example is designed . the design result is simulated by means of system simulation model established . the simulation results confirm that every performance can meet the requirement of the indexes 给出了多指标限定下凸轮型面规律的设计方法、设计模型，并作了实例设计；通过建立系统仿真模型对设计结果作了仿真验证，证明各项性能均满足指标要求，并仿真分析了系统参数变化对拦阻效果的影响。
Firstly , the predesign is carried out by use of the conventional analysis , and then the acceleration curve of the cam driven component is processed and revised discretely according to the requirements of dynamics performance . . the design equation based on a refined finite - difference algorithm is established and the calculating process is realized by the computer programs . consequently , the cam profile with good performance can be attained 该方法先用常规解析法作初步设计，根据动力性要求对从动件加速度曲线进行离散化处理和修正，再用有限差分法建立凸轮型线的设计方程式，通过计算机程序进行计算求解，因而可以获得优良性能要求的凸轮型线。
Based on the compound poly - power function cam profiler design method of optimum cam profile was investigated . cam time profile of the original tbd604b diesel was analyzed and the cam profile was designed again by use of the method mentioned in this paper . performance testing improved and higher power output tbd604b diesel was satisfactory 本文以复合高次方凸轮型线为基础，探讨了凸轮型线的优化设计方法，对tbd604b柴油机原机的配气凸轮进行分析了解了tbd604b柴油机配气凸轮的升程函数为高次方曲线，且经优化，在允许的最大正加速度条件下，丰满系数已达最大值。
