Transmission control system

Details Transmission control system Transmission control system

E - Fixed Constructions

02

F

74/154

E02F 9/02 (2006.01) B60K 17/04 (2006.01) B60K 17/06 (2006.01) E02F 3/85 (2006.01)

Patent

CA 1075040

Abstract of the Disclosure In a transmission control system for a multiple speed ratio power- shift transmission having a plurality of fluid pressure operated clutches adapted to establish torque ratio changes, an electronic speed sensing system and downshift valve means for automatically shifting the transmis- sion from a higher speed ratio to a lower speed ratio at a first pre- determined vehicle ground speed by diverting the fluid for pressurizing a higher speed ration clutch to a lower speed ratio clutch and then auto- matically shifting the transmission from the lower speed ratio back to the higher speed ratio at a second higher predetermined vehicle ground speed by ceasing the diverting of the pressurized fluid.

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