Control valve system for a continuously variable...

Details Control valve system for a continuously variable... Control valve system for a continuously variable...

F - Mech Eng,Light,Heat,Weapons

16

H

138/79

F16H 47/06 (2006.01) F16H 61/12 (2010.01) F16H 61/662 (2006.01)

Patent

CA 1297382

- 17 - ABSTRACT OF THE DISCLOSURE A control valve system for controlling the operation of a continuously variable belt-driven motor vehicle transmission includes a first hydraulic pump that supplies fluid to the displacement cylinders of the transmission through a main pressure regulating valve and a transmission ratio control valve as a function of the setting of the manual selector valve and as a function of the torque requirement and speed of the vehicle. The torque converter is supplied with hydraulic fluid by way of a relief valve which comes into operating in the event of failure of an electronic control unit and a decrease in the vehicle speed. A first emergency operation on/off valve transmits torque at converter discharge pressure, by way of a second emergency on/off valve, as emergency operation control pressure to a transmission ratio control valve.

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