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气动油门操纵系统，在工程机械中较为常用，它的原理如图１所示，是靠气动阀通断，控制单作用气缸，从而控制油门的开度，改变发动机的转速。随着工程机械各种性能的不断完善，这种气动油门操纵系统，逐渐显示出它的局限性，这种局限性主要表现在以下几个方面： （１）不少工程
Pneumatic throttle control system, more commonly used in construction machinery, its principle shown in Figure 1, is the pneumatic valve on and off, control the single-acting cylinder, thereby controlling the throttle opening, changing the engine speed. With the continuous improvement of various performance of construction machinery, this pneumatic throttle control system gradually shows its limitations. This limitation mainly manifests itself in the following aspects: (1) Many projects