Transmission and control method for transmission

A transmission, comprising:

• a transmission mechanism including a torque converter having a lock-up clutch;
• an oil pump configured to discharge an oil to be supplied to the transmission mechanism;
• a lock-up oil pressure control valve configured to adjust a pressure of the oil discharged from the oil pump and supply the oil to the lock-up clutch;
• a lubricating oil pressure control valve configured to adjust the pressure of the oil discharged from the oil pump and supply the oil to a portion to be lubricated of the transmission mechanism;
• and
• a controller configured to control the lock-up oil pressure control valve and the lubricating oil pressure control valve,
• wherein the controller controls the lubricating oil pressure control valve in a manner that a lubricating oil pressure which is the oil pressure supplied from the lubricating oil pressure control valve increases as an oil temperature decreases, and
• controls the lock-up oil pressure control valve so that a precharge time when the lubricating oil pressure is a first lubricating oil pressure becomes shorter than another precharge time when the lubricating oil pressure is a second lubricating oil pressure which is lower than the first lubricating oil pressure when performing a precharge of supplying the oil to the lock-up clutch.