Forced engagement logic
US5429559A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 22, 1993 |
| Grant date | Jul 4, 1995 |
| Priority date | — |
| Expiry date | Sep 22, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T74/1926
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A control system/method (104) for controlling execution of selected shifts of a mechanical transmission system (10) is provided. The control system includes a central processing unit (106) for receiving input signals indicative of engine or input shaft (11/98) speeds and of output shaft or vehicle speed (VS) speeds and from a driver control console (108) indicative of manual or automatic selection of upshifts or downshifts from a currently engaged gear ratio 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 upon a manually or automatically caused torque break of the transmission and manually or automatically caused substantial synchronization of the transmission thereafter. The predetermined logic rules include a strategy for sensing conditions indicative of a potentially dangerous downhill free-wheeling situation and for immediately causing the forced engagement of a gear ratio (GR.sub.FE) determined as a function of vehicle speed regardless of the presence or absence of substantially synchronous conditions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.