Abstract: A control system and method for a semi-automatic mechanical transmission system (10) is provided for sensing high resistance to vehicle forward movement and allowing engagement of a gear ratio lower than the lowest engageable ratio at substantially constant vehicle speed.

Abstract: A control system and method for a semi-automatic mechanical transmission system (10) is provided for allowing operator request for a direct downshift into transmission neutral, under certain predefined conditioned, by a single movement of the shift lever (1).

Abstract: A control and control method for a semi-automatic mechanical transmission system (10) is provided for sensing operator request for a direct downshift into an optimum pull-away ratio and for automatically determining and engaging the optimum pull-away ratio.

Abstract: A method for smoothing skip up-shifts in an automated mechanical transmission system (10) without requiring direct sensing of the rotational speed of the engine (14) is provided. The method involves delaying re-engagement of the master clutch (16) after engagement of a selected transmission ratio (E) during a skip up-shift by a period of time (T) directly proportional to the number (N) of ratios skipped and/or a function of the identity of the newly engaged ratio.

Abstract: A transmission system (10) including a control display (2, 302) is provided. The control display comprised of three sections, a currently engaged gear ratio section (2'") a maximum permissible consecutive upshift indicating section (2') and a maximum permissible consecutive downshift indicating section (2"). The central processing unit (38) includes circuitry and logic rules to process input signals to determine the currently permissible gear ratios and will indicate said gear ratios, in the form of maximum permissible upshifts and downshifts, at said display. The central processing unit also includes circuitry and logic rules to sense the existence of a fault condition, to assign a predetermined code ("18") thereto and to issue command output signals to the display to cause the second and third sections to assume a fault condition indicating display and to cause said first section to display to assigned code.

Abstract: A control display (2) for a transmission is provided. The display includes a first section (2'") displaying the current engaged ratio, a second section (2') displaying permissible upshifts and a third section (2") displaying permissible downshifts.

Abstract: A semi-automatic mechanical transmission system (10) and method for controlling same is provided. The transmission system includes a shaft selector lever (1) which may be moved forward or rearward from the centered position thereof to select upshifts and downshifts, respectively, and a central processing unit (38) receiving input signals from the selector lever and which will sense multiple movements of the shift select lever in a given direction and interpret same as request for multiple or skip shifts in said direction. The control also includes a display (2) comprised of three sections, a currently engaged gear ratio section (2'") a maximum permissible consecutive upshift indicating section (2') and a maximum permissible consecutive downshift indicating section (2").