Patent ID: 9551132
Date: 2017-01-24
CPC Classifications: E02F,F16H

Claim:
1. An automatic transmission control unit for construction machinery, comprising: an electronic control-type hydraulic pump configured to supply hydraulic pressure to a plurality of actuators; a load pressure detecting unit connected to a discharge line of the electronic control-type hydraulic pump, and configured to detect load pressure applied from the electronic control-type hydraulic pump to the plurality of actuators; a manipulation pressure detecting unit configured to detect a manipulation pressure generated by a manipulation unit operating the plurality of actuators; and a controller configured to receive the load pressure detected by the load pressure detecting unit and the manipulation pressure detected by the manipulation pressure detecting unit, and control a pressure instruction of the hydraulic pump, wherein when the load pressure detecting unit is in a normal state, the controller automatically changes a speed of a travel motor among the plurality of actuators based on the load pressure, and when the load pressure detecting unit is in an abnormal state, the controller automatically changes a speed of the travel motor based on the pressure instruction.