ELECTRIC OIL PRESSURE CONTROL DEVICE OF DRIVING ROW OF MACHINE

摘要

PROBLEM TO BE SOLVED: To reduce impeller clutch pressure by receiving a desired rimple signal, changing an impeller clutch pressure curve, controlling an electric hydraulic valve by receiving an impeller clutch pedal signal, and generating desired impeller clutch pressure from the impeller clutch pressure curve. SOLUTION: One of rimple preset values reducing in four stages is selected by a four-position rotary switch 205, and either of a maximum rimple of 100% or the preset value from the switch 205 is selected by a two-position locker switch 210. An electronic control 128 changes an impeller clutch pressure curve by receiving a signal by these switch positions. That is, maximum allowable pressure in a master impeller clutch pressure curve is changed to torque of a motive power transmission system, that is, to maximum allowable pressure reduced in response to desired reduction in a rimple. Therefore, torque of the motive power transmission system, that is, rimple-improved controllability can be obtained.