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内燃机换气过程特性直接影响内燃机性能。良好的配气机构不仅力求气门的开启有尽可能大的时面值,而且要求其配气正时在任何工况下都能使发动机性能最佳。对柴油机而言,最佳的进、排气门开启规律(IN,EX)_(opt)可表为发动机转速n,负荷N_(?),增压参数TB 的函数,即:(IN,EX)_(opt)=f(n,N_(?),TB) (1)通常的凸轮驱动式气门机构只能使发动机在某一工况点上获得最佳性能,而当发动机工况发生变化时其固定的配气规律不可能满足使发动机性能最佳的要求。国外曾有人对凸轮驱
The characteristics of the internal combustion engine ventilation process directly affect the performance of the internal combustion engine. A good valve train not only seeks to keep the valve open as long as possible, but also requires the valve timing to optimize engine performance under any operating conditions. For diesel engines, the best intake and exhaust valve opening laws (IN, EX) _ (opt) can be expressed as a function of the engine speed n, the load N_ (?) And the boost pressure TB, (opt) = f (n, N _ (?), TB) (1) The typical cam-driven valve train can only get the best performance of the engine at a certain operating point, and when the engine operating conditions change When its fixed gas distribution law can not meet the requirements of the engine performance. Someone abroad has cam drive