Patent ID: 7912616
Filing Date: 2011-03-22
Classification: B29C,F16H

Abstract:
1. A gear shifting control device for a work machine having a torque converter and a transmission for transmitting the motive power of an engine to wheels to move the work machine, wherein the transmission has a plurality of clutches and selectively supplies hydraulic oil to the plurality of clutches for gear shifting purposes, the gear shifting control device comprising: learning control means, which is provided for each of the plurality of clutches and has a plurality of handling processes which are composed of a plurality of subprocesses, for causing each of the plurality of clutches to learn the clutch hydraulic pressure in each of the plurality of handling processes, and determining clutch hydraulic pressure characteristic values for operating each clutch; and learning monitoring means for formulating an error judgment in each of the plurality of handling processes to judge whether learning has failed in each of the plurality of subprocesses and displaying the result of the judgment.