Patent ID: 8147380

Claim:
A hydraulic control device of an automated multi-step transmission, the control device comprising: a plurality of gear-actuating cylinders (Z 1 -Z 4 ) for engaging and disengaging gears of the multi-step transmission; at least two pressure-controlled gear-regulating valves (GV 1 -GV 3 ) for controlling an operating pressure of one pressure chamber (D 1 -D 8 ) of the gear-actuating cylinders (Z 1 -Z 4 ); a multiplex arrangement ( 2 , 102 ) of a plurality of singly switchable pressure-controlled selector valves (WV 1 -WV 3 ) for assigning the gear-regulating valves (GV 1 -GV 3 ) to, in each case, the one pressure chamber (D 1 -D 8 ) of the gear-actuating cylinders (Z 1 -Z 4 ); at least one common pilot valve (VV 1 -VV 3 ) for actuating one of the gear-regulating valves (GV 1 -GV 2 ) and at least one of the selector valves (WV 1 -WV 3 ); the pilot valve (VV 1 -VV 3 ) having a first control pressure range (ΔP_B 1 ) containing a switching pressure (P_S) of the at least one selector valve (WV 1 -WV 3 ) and a second control pressure range (ΔP_B 2 ) containing a regulating range (ΔP_R) of the gear-regulating valve (GV 1 -GV 3 ); the gear-regulating valve (GV 1 -GV 3 ) and the at least one selector valve (WV 1 -WV 3 ), which are controllable by the common pilot valve (VV 1 -VV 3 ), being assigned to one of different actuating rods and a different partial transmission; and the multi-step transmission or the partial transmission of the multi-step transmission having two actuating rods, a switching arrangement with two gear-regulating valves (GV 1 , GV 2 ), two selector valves (WV 1 , WV 2 ), and two pilot valves (VV 1 , VV 2 ), in each case two pressure chambers (D 1 -D 4 ) being alternately connectable, via respectively one of the selector valves (WV 1 , WV 2 ) with the operating pressure line ( 13 , 33 ) of an assigned gear-regulating valve (GV 1 , GV 2 ) or a non-pressurized line, such that a control pressure chamber ( 11 , 31 ) of the respective gear-regulating valve (GV 1 , GV 2 ), by a control pressure line ( 7 , 27 ) and a switching pressure chamber ( 43 , 53 ) of the selector valve (WV 1 , WV 2 ) assigned respectively to the other gear-regulating valve (GV 1 , GV 2 ) via a switching pressure line ( 8 , 28 ), being connected respectively to a control terminal ( 6 , 26 ) of a common pilot valve (VV 1 , VV 2 ).