触发叶轮随发动机转速而旋转，使得转速传感器或拾波线圈产生与发动机转速和活塞位置相对应的触发电压脉冲。

The trigger wheel rotates with engine RPMs and causes the speed sensor, or pickup oil, to produce triggering voltage pulses that correspond to engine speed and piston position.

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借助根据发动机(10)的燃烧频率所限定出的频率来过滤旋转速度，以得到与目前转矩相对应的值。

The rotation speed is filtered by a frequency which is defined based on a combustion frequency of the engine (10) to obtain a value corresponding to a current torque.

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