Patent ID: 8790207
Filing Date: 2014-07-29
Classification: B60K,B60Y,F16D,F16H,Y02T

Abstract:
1. A hydraulic control system of an automatic transmission for a hybrid vehicle which selectively operates first and second clutches and first and second brakes according to a plurality of driving modes, the hydraulic control system comprising: a first proportional control solenoid valve for selectively supplying a forward pressure and a reverse pressure supplied from a manual valve to the first clutch; a second proportional control solenoid valve for selectively supplying a line pressure supplied from a primary regulator valve to the second clutch; a third proportional control solenoid valve for selectively supplying the line pressure supplied from the primary regulator valve to the first brake; and a fourth proportional control solenoid valve for selectively supplying the forward pressure supplied from the manual valve to the second brake; wherein a fail-safe assembly comprising at least one of first, second, and third fail-safe valves are connected between the third and fourth proportional control solenoid valves and the first and second brakes.