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液力传动内燃机车，采用部分充油及PID仪表控制角行程执行器，根据给定速度与机车速度，自动调节柴油机转速，使机车阻力与柴油机输出功率相对平衡，达到机车恒速、恒低速运行的目的，满足机车恒低速牵引，通过电子衡及其它恒低速作业的需要。对现有各种液力传动内燃机车，在不改变其原结构和原性能的情况下，可方便地增设恒低速自动控制装置。此系统经济实用，运行可靠，是机电一体化在内燃机车控制技术上的新探索。
Hydraulic drive diesel locomotive adopts partial oil filling and PID instrument to control the angular stroke actuator to automatically adjust the diesel engine speed according to the given speed and locomotive speed so as to balance the locomotive resistance with the output power of diesel engine and achieve the constant speed and constant low speed operation of the locomotive The purpose of meeting the locomotive constant low speed traction, through the electronic balance and other constant low-speed operation needs. On the existing hydraulic transmission diesel locomotive, without changing its original structure and the original performance of the circumstances, can be easily added constant low speed automatic control device. The system is economical and practical, reliable operation, is a new exploration of mechatronics control technology in diesel locomotives.