Downshift inhibitor circuit

Details Downshift inhibitor circuit Downshift inhibitor circuit

1977-05-09

1979-08-21

Chandler, Lance W.

Machine element or mechanism

Gearing

Interchangeably locked

74365, B60K 4118, F16H 308, F16H 542, F16H 568

Patent

active

041648765

ABSTRACT:
In a transmission control system for a multiple speed ratio powershift transmission having a plurality of fluid pressure operated clutches adapted to establish torque ratio changes and also including an electronic speed sensing system and downshift valve means 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 for prohibiting downshifts from the higher speed ratio to the lower speed ratio while the vehicle undergoes a full throttle directional reversal.

REFERENCES:
patent: 3348643 (1967-10-01), Townsend
patent: 3403587 (1968-10-01), De Castelet
patent: 3498430 (1970-03-01), Briski
patent: 3540556 (1970-11-01), Snoy et al.
patent: 3665779 (1972-05-01), Mori
patent: 3732755 (1973-05-01), Beig et al.
patent: 3874255 (1975-04-01), Minami
patent: 3937107 (1976-02-01), Lentz
patent: 4015488 (1977-04-01), Akeson et al.
patent: 4038889 (1977-08-01), Lindow et al.

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