This paper puts forward a new method for solving hysteresis loop and stick-slip Phenomenon in large torque, high load and low speed conditions, i. e. PWMtype NC proportional directional control.

本文针对大惯量、大负荷、低速工况的滞环及爬行现象，提出了一种新型的解决方法——脉宽调制（PWM）型数控比例方向阀控制。

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Pneumatic cylinders may not retain steady motion when driven at low speed because of the stick-slip which decreases the accuracy of the pneumatic system.

由于爬行现象的影响，气缸在低速驱动时不能保持平滑的运动状态，降低了气动系统的控制精度。

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