Automatic speed-changing system for heavyduty automotive equipment
AssigneeSociete Anonyme C.E.T.I.M.
InventorJean Franssen
Life of this patent
Estimating the term…
Abstract
An automotive transmission with three forward speeds and three reverse speeds is automatically upshifted or downshifted under the control of a speed sensor coacting with an output shaft of that transmission. The engine is automatically decelerated and accelerated during upshifting and downshifting, respectively, for a smooth transition from one speed ratio to the next. A changeover from forward driving to reverse, or vice versa, with the aid of a manual mode selector is possible only at relatively low shaft speeds. Another manual selector is settable to limit the operation of the system to one or two speed ratios in either the forward or the reverse mode.
Claims6
An automatic speed-changing system for automotive equipment provided with an internal-combustion engine, a reversible transmission driven by said engine, said transmission having an output shaft adapted to be coupled to said engine by a shiftable gear train provided with first gear-shifting means for selectively establishing a forward mode, a neutral mode and a reverse mode and with second gear-shifting means for establishing any one of a plurality of different speed ratios between said engine and said output shaft, and driver-actuated means for changing the operating speed of said engine,
- the combination therewith of:
- manually operable selector means connected to said first gear-shifting means for establishing any one of said modes;
- speed-sensing means coacting with said output shaft and connected to said second gear-shifting means for establishing different speed ratios in response to shaft speeds passing predetermined levels;
- and
- automatic decelerating means coupled with said engine and responsive to said speed-sensing means for temporarily slowing down said engine independently of said driver-actuated means during upshifting from a lower speed ratio to a higher speed ratio.
Dependencies are inferred from the claim text.