Patent ID: 7338402

Claim:
A device for the hydraulic control of a continuously variable automatic transmission, comprising a forward/reverse drive unit ( 4 ), which is shifted by means of at least one first and one second shifting component ( 5 , 6 ), the first and second shifting components ( 5 , 6 ) are pressurized by means of at least two valves ( 7 , 8 , 17 , 18 , 20 , 21 ) via a pressurized medium pump ( 9 ), and with a gear selector device ( 15 ), with which selection may be made among at least one forward gear (D), one neutral gear (N), and one reverse gear (R), and which is mechanically connected to a control unit ( 14 ), for selection of the gears, the control unit ( 14 ) possesses a non-mechanical connection ( 32 ) for actuation of the valves ( 7 , 8 , 17 , 18 , 20 , 21 ), a first valve ( 7 ), which is pressurized with system pressure, is controlled via a first pressure regulator valve ( 10 ) and adjusts pressure with which the first and second shifting components ( 5 , 6 ) are pressurized, along with at least one other valve ( 8 , 17 , 18 ) that selects which of the first and second shifting components ( 5 , 6 ) will be pressurized with an output pressure of the first valve ( 7 ), the device further comprises a third and fourth valve ( 17 , 18 ) which are used to select whether the first and second shifting components ( 5 , 6 ) that are connected in series in each case shall be pressurized with the output pressure of the first valve ( 7 ), the first shifting component is a brake which is pressurized via the third valve ( 17 ) and the second shifting component is a clutch which is pressurized via the fourth valve ( 18 ), and furthermore the fourth valve ( 18 ) is additionally controlled by means of a third pressure regulator valve ( 19 ), the third pressure regulator valve ( 19 ), which controls the fourth valve ( 18 ), also controls a consumer ( 1 ), and in that the third and fourth valves ( 17 , 18 ) are controlled via a first solenoid valve ( 11 ).