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1.故障现象1台沃尔沃L180E型装载机作业过程中,挂入自动挡后突然出现行驶速度不平稳现象,改用手动挡时,操作人员发现只有Ⅲ、Ⅳ挡,而没有Ⅱ挡。2.工作原理该装载机配装电液控制自动/手动换挡4速变速器,模式选择器可在自动换挡或手动换挡之间切换,以适应不同的行驶和作业需要。其控制原理如附图所示。驾驶员将模式选择器置于自动模式时,自动模式信号输入至I-ECU控制器,经处理后输入至V-ECU控制器。V-ECU控制器根据装载机行驶速度、
1. Symptom 1 Volvo L180E loader during the operation, after hanging into the automatic transmission suddenly appeared not smooth running speed, switch to manual gear, the operator found only Ⅲ, Ⅳ block, and no block Ⅱ. 2. Working Principle The loader is equipped with electro-hydraulic automatic / manual shift 4-speed transmission. The mode selector can be switched between automatic or manual shift to suit different driving and operation needs. The control principle as shown in the figure. When the driver places the mode selector in automatic mode, the automatic mode signal is input to the I-ECU controller and processed to be input to the V-ECU controller. V-ECU controller according to loader speed,