Title: Downshift inhibitor circuit

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.

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Inventors: Peppel, Jon H. (Horton, MI, US)

Application Number: 794763
Filing Date: 1977-05-09
Publication_date: 1979-08-21
Assignee: Clark Equipment Company (Buchanan, MI)
Primary Class(es): 74/336R 74/365
Other Classes:
US Patent Ref:

3348643	Oct, 1967	Townsend	74/336.
3403587	Oct, 1968	De Castelet	74/866.
3498430	Mar, 1970	Briski	74/336.
3540556	Nov, 1970	Snoy et al.	192/51.
3665779	May, 1972	Mori	74/866.
3732755	May, 1973	Beig et al.	74/336.
3874255	Apr, 1975	Minami	74/866.
3937107	Feb, 1976	Lentz	74/865.
4015488	Apr, 1977	Akeson et al.	74/866.
4038889	Aug, 1977	Lindow et al.	74/866.

Other Refs:
Primary Examiner: Chandler, Lance W.
Assistant Examiner:
Attorney: Ruf; Ernst H.