| 摘要 |
PROBLEM TO BE SOLVED: To provide a hydraulic control device of an automatic transmission, in particular, a control method of a line pressure supplied to a frictional fastening element such as a clutch at a high temperature.SOLUTION: In a hydraulic control method of an automatic transmission, a hydraulic circuit executing the hydraulic control method, includes a primary regulator valve controlled to increase and decrease a line pressure in response to increase and decrease of a clutch transmission capacity, and a secondary regulator valve disposed at a downstream side of the primary regulator valve for adjusting a pressure of a lubricant reaching an oil cooler. The pressure of the lubricant is increased and decreased according to increase and decrease of the line pressure, and the pressure is adjusted and controlled by the primary regulator valve to increase the line pressure, when a temperature of the lubricant is higher than a prescribed temperature. |
