| 摘要 |
A hydraulic control system of automatic transmission for vehicles includes a torque converter control part having a damper clutch control solenoid valve and a regulator valve; a manual valve for supplying an oil pressure to another lines according to a shift lever's position; a first, a second, and a third indirect control valves, to which the oil pressure is supplied if the manual valve is set in drive "D" range; a first, a second, and a third solenoid valves, each of which controls the indirect control valves, respectively; a first friction element communicating with the first indirect control valve; a second friction element communicating with the second indirect control valve; a third friction element communicating with the second indirect control valve; a fourth friction element communicating with the third indirect control valve; a switch valve for supplying an operating pressure to the second friction element in drive "D" range and supplying the operating pressure to the third friction element in "L" range selectively; and a safety valve which is connected to the switch valve and prevents a gear train from locking when the operating pressure is applied to the friction elements simultaneously.
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