| 摘要 |
PROBLEM TO BE SOLVED: To suppress vibration and noise of an oil pump of an automatic transmission under very low temperature condition. SOLUTION: ECU executes a program including a step S1010 detecting temperature T(C) of working fluid of CVT (Continuously Variable Transmission) when an engine starts (Yes in S1000), a step S1030 determining line pressure set value for low fluid temperature when T(C) is a low temperature threshold or less (Yes in S1020), and steps S1050 - S1070 sweeping a set line pressure and gradually raising the same to a normal line pressure set value when predetermined time elapses under a low pressure stand by condition where the line pressure set value for low fluid temperature is maintained (Yes in S1040). COPYRIGHT: (C)2008,JPO&INPIT |
