Mode control for mechanical transmission system with semi-automatic shift implementation and manual and automatic shift preselection modes
US5050079A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 17, 1990 |
| Grant date | Sep 17, 1991 |
| Priority date | — |
| Expiry date | Aug 17, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T74/1926
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A mode control method/system for a control system (104) for semi-automatically executing automatically and manually selected upshifts and downshifts of a mechanical transmission system (10) is provided. The control system includes a central processing unit (106) for receiving input signals indicative of transmission input shaft (16) and output shaft (90) speeds and from a driver control console (108) indicative of manual selection of upshifts or downshifts from a currently engaged gear ratio, or manual selection of operation in an automatic preselect mode, and processing the same in accordance with predetermined logic rule to issue command output signals to a transmission actuator (112, 70, 96) to implement the selected shifts by automatic shifting into neutral upon a naturally or manually caused torque reversal of the transmission and remaining in neutral until the vehicle operator causes substantially synchronous conditions to occur. The method (200) includes sensing if output shaft speed remains substantially constant and the transmission is not shifted (Shift=F) for a predetermined time (REF) and then causing the system to operate in the manually selected shift mode of operatio…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.