Transmission control system downshift inhibitor circuit - has downshift inhibitor for higher speed to lower speed ratio shift while vehicle undergoes rapid directional reversal

摘要

The transmission control system for a multiple speed ratio power shift transmission has a number of fluid pressure operated clutches adapted to establish torque ratio changes. Also included is an electronic speed sensing system and downshift valve for automatically shifting the transmission from a higher speed ratio to a lower speed ratio at a first predetermined vehicle ground speed. The addition of a downshift inhibitor or delay circuit prohibits downshifts from the higher speed ratio to the lower speed ratio while the vehicle undergoes a full throttle directional reversal. An electronic speed sensing system is provided having downshift delay circuits.