With the relay can be; but if you need to speed, you can use the transistor, FET and other switching elements to achieve PWM (pulse width modulation) speed.
用继电器即可；但如果需要调速，可以使用三极管，场效应管等开关元件实现PWM（脉冲宽度调制）调速。
The basic program is that in the wiper circuit the power transistor and relay are connected in series to perform drive control.
主要方案是，在刮水装置回路中串接功率三极管或继电器实行驱动控制。
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