The model of voice coil motor and optical pickup unit are analyzed, the model parameters are tested, the model of DVD focus servo system is built and the simulation is carried out.

分析了DVD聚焦伺服系统中音圈电机和光头拾取器的数学模型，通过实验测定其模型参数，完成了DVD聚焦伺服系统的建模，并进行了仿真。

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The electronic control unit allows current to flow through the ignition coil primary winding until it senses a triggering voltage pulse from the speed sensor, or pickup coil.

电子控制单元使电流通过初级绕组直到感知到一个从转速传感器或拾波线圈产生的触发电压脉冲。

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The main fuel tank must have all the following: a filler tube, a ventilation system, fuel pickup tube and filter, plus a gauge-sending unit.

油箱必须装备以下元件：加油管、油箱通风系统、吸入管、滤清器和油量传感装置。

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That explosion shattered glass on several storefronts and left the stricken police unit's modified Ford pickup truck charred and mangled.

NPR: Alarm Grows As Iraqi Forces Fail To Stem Violence

Analysts point out that the company is not particularly competitive in the pickup and SUV markets, which are still important high margin vehicles even with unit volumes well below the peaks of a few years ago.

FORBES: Can Detroit Accelerate?