| 摘要 |
PROBLEM TO BE SOLVED: To provide an automatic transmission hydraulic control device capable of suppressing reduction in the engagement pressure of a corresponding engagement element even if voltage drop occurs during actuation of a hydraulic servomechanism by an electric oil pump, without increasing the number of components.SOLUTION: If a line pressure PL is supplied from a first hydraulic pressure supply unit 10, a switching valve 60 is set in a first state to accumulate the line pressure PL in an accumulator 50 via an oil passage h1. If the line pressure PL is not supplied from the first hydraulic pressure supply unit 10 and an electromagnetic pump pressure PEMOP is supplied from an electromagnetic pump 20, the switching valve 60 is set in a second state to supply the electromagnetic pump pressure PEMOP to a hydraulic servomechanism 4 via oil passages f1, f2, and d1 and accumulate the electromagnetic pump pressure PEMOP in the accumulator 50 via oil passages f1, f2, g1, b3, and h1. |
