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卡特E240型挖掘机的发动机转速自动控制系统，简称AEC系统。其电路原理图如图1所示。1AEC系统工作原理AEC系统是对高、低两速进行限位的油门自动控制系统，利用蜗轮蜗杆来改变油门限位杆件左右移动，控制发动机转速，从而使工作时发动机油门处于高速位置，空载时发动机油门处于
Carter E240 excavator engine speed automatic control system, referred to as AEC system. The circuit diagram shown in Figure 1. 1AEC system works AEC system is high and low two-speed throttle limiting automatic control system, the use of worm gear to change the lever around the throttle lever to control the engine speed, so that work when the engine throttle in a high-speed position, empty Engine load when the engine is