Pressure controlling the surplus oil from the line pressure control valve which controls

摘要

PROBLEM TO BE SOLVED: To provide an oil amount balance controlling device capable of preventing the deterioration of durability caused by a delay in coupling a clutch by the deterioration of an oil balance in a forward/backward shift controlling section in a downstream since a line pressure control value is increased when a high load is selected.;SOLUTION: When judging at S56 that a high load is selected at S52, S54, a line pressure limit value PLLIM in an oil amount balance where a clutch main pressure control valve 26 can produce a predetermined pressure when a high load is selected is found from a hydraulic oil temperature TMP read at S55 and an engine revolution speed Ne (oil pump revolution speed) read at S53, the line pressure limit value PLLIM and a line pressure target value PLO at a high load selection found at S64 are compared at S57, the line pressure target value PLO is set to a line pressure command PL at S58 if PLLIM≥PLO, and the line pressure limit value PLLIM is set to the line pressure command PL at S59 if PLLIMPLO.;COPYRIGHT: (C)2003,JPO