一些高性能发动机有两个单独的凸轮轴，分别负责开关进气门和排气门。
Some high-performance engines have two separate camshafts, one for each set of inlet and exhaust valves.
分布：两个顶置凸轮轴，16气门。
由气门加速度积分和气门升程微分得到两路气门速度信号。
Two kinds of valve velocity data were got from valve acceleration integral and displacement differential.
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