AUTOMATIC TRANSMISSION HYDRAULIC CONTROL DEVICE

摘要

PROBLEM TO BE SOLVED: To provide an automatic transmission hydraulic control device capable of reducing the number of solenoid valves and reliably achieving range shifting.SOLUTION: The automatic transmission hydraulic control device comprises: a reverse supply oil passage 96 capable of supplying a reverse range pressure PR supplied from a manual valve 21 to a hydraulic servo 93 as an engagement pressure of a first brake B1; an accumulator 28 connected to the reverse supply oil passage 96 and automatically regulating the reverse range pressure PR at a time of engaging the first brake B1; a synchromesh detection unit detecting an engaged state of a synchromesh mechanism S1; and a selector valve 27 provided in the reverse supply oil passage 96, and capable of switching the reverse supply oil passage 96 over between a communication state and a cutoff state, the selector valve 27 keeping the cutoff state until the synchromesh detection unit detects the engaged state of the synchromesh mechanism S1 and switching the cutoff state to the communication state after the synchromesh detection unit detects the engaged state of the synchromesh mechanism S1 if a range other than R-range is changed to R-range.SELECTED DRAWING: Figure 3