Patent ID: 7617918

Claim:
A system ( 1 ) controlling a starter mechanism ( 3 ) which is actively connected with a hydraulic supply circuit ( 2 ) of a transmission unit, the system comprising: the starter mechanism having a converter bridging clutch ( 27 ), a piston chamber ( 4 ) and a hydraulic chamber ( 6 ), the converter bridging clutch ( 27 ) being actuated, upon introduction of a working pressure (p_A) into the piston chamber ( 4 ), and an area of the starter mechanism ( 3 ) being cooled and lubricated upon introduction of a lubrication pressure (p_SD) to the a hydraulic chamber ( 6 ); a first pressure relief valve (DBV 1 ) regulating the working pressure (p_A) delivered to the piston chamber ( 4 ); a second pressure relief valve (DBV 2 ) regulating the lubrication pressure (p_SD) delivered to the hydraulic chamber ( 6 ); a first pilot pressure (p_VS(DBV 1 )) controlling a valve slide (DBV 1 _S) of the first pressure relief valve (DBV 1 ), and a first pressure control valve ( 10 ) and a first spring device (DBV 1 _F) controlling the first pilot pressure (p_VS(DBV 1 )); a second pilot pressure (p_VS(DBV 2 )) controlling a valve slide (DBV 2 _S) of the second pressure relief valve (DBV 2 ), and a second pressure control valve ( 11 ) and a second spring device (DBV 2 _F) controlling the second pilot pressure (p_VS(DBV 2 )); the working pressure (p_A) exerting force on a first back pressure outlet port (DBV 16 ) of the first pressure relief valve (DBV 1 ) and the lubrication pressure (p_SD) exerting force on a back pressure outlet port (DBV 21 ) of the second pressure relief valve (DBV 2 ); a hydraulic pressure (p_vor, p_in, p_na), in an area between a lubrication pressure control port (DBV 23 ) of the second pressure relief valve (DBV 2 ) and a return area of the hydraulic chamber ( 6 ), exerting a force on a second back pressure outlet port (DBV 12 ) of the first pressure relief valve (DBV 1 ), and the hydraulic pressure (p_vor, p_in, p_na) being equivalent to the lubrication pressure (p_SD); and the hydraulic pressure (p_vor, p_in, p_na) exerting a force on the valve slide (DBV 1 _S) of the first pressure relief valve (DBV 1 ) in an opposing direction to the force of the working pressure (p_A) exerted on the first back pressure outlet port (DBV 16 ) of the first pressure relief valve (DBV 1 ), such that a feed-back of the hydraulic pressure (p_vor, p_in, p_na) exerted on the first pressure relief valve (DBV 1 ) is added to a pilot signal characteristic of the first pressure relief valve (DBV 1 ).