采用电压曲线控制门机运行速度，提高了门机运行的精确性和平滑性。
In order to improve the accuracy and smoothness of door's running, a timing method is put forward which is that taking advantage of voltage curve to control the speed curve.
进气致动器提供驱动力，从而室内和室外空气控制门同时打开室内空气入口和室外空气入口。
The intake actuator provides a driving force so that an indoor and outdoor air control door simultaneously opens indoor and outdoor air inlets.
由缓冲寄存器、环形分配器、控制逻辑及正反转控制门组成的步进电机控制器则用计算机软件替代。
The step motor controller composed of buffer register, the circular allotter, the control logic, the positive run and back run control circuits is replaced by computer software.
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