介绍了摊铺机行驶控制系统的基本要求，以单边行驶回路为例探讨了其工作原理； 根据摊铺机对行驶速度的要求，分析了恒速控制技术，探讨了行驶系统控制方式。

The principle of phase lock loop and its application in the motor power-measuring system are introduced, furthermore the design and analysis of the circuit for constant speed control are provided.

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