Continuously variable transmission with a hydraulic control system

Continuously variable transmission provided with a drive belt (3), fitted between a primary pulley (1) and a secondary pulley (2) of the transmission, each pulley having two pulley sheaves (4, 5) of which at least one pulley sheave (4) of each pulley (1, 2) is axially movable under the influence of a hydraulic pressure exerted in a pressure cylinder (11;

• 12) of the respective pulley (1;
• 2), and with a hydraulic control system for controlling these respective cylinder pressures (Pp, Ps), which hydraulic control system a/o comprises:
• two oil pumps (41, 42) capable of delivering a flow of oil to a main hydraulic line (46) of the hydraulic control system,
• a line pressure valve (44) capable of controlling a main system or line pressure (Ps) in the main hydraulic line (46) to coincide with a desired pressure level there for, by allowing a smaller or larger further flow of oil to discharge from the main hydraulic line (46) towards a lubrication circuit (51) of the hydraulic control system, and
• one or more pump flow control valves (100, 48) capable of selectively connecting to or disconnecting from the main hydraulic line (46) at least one oil pump (42) of the said two oil pumps (41, 42) in dependency on a lubrication pressure (Pb) prevailing in the lubrication circuit (51), wherein, the one or more pump flow control valves (100, 48) is/are arranged to connect to or disconnect from the main hydraulic line (46) the said one oil pump (42) in dependency on a difference between the line pressure (Ps) and the desired line pressure level.