Torque converter slip rate based skip power downshift control strategy
US5274553A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 9, 1991 |
| Grant date | Dec 28, 1993 |
| Priority date | — |
| Expiry date | May 9, 2011 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2061/0444
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A power downshift control method/system strategy (FIG. 6), based upon sensed torque converter slip (TC slip) is provided for an automated mechanical transmission system (12) including an engine (16), a mechanical transmission (14) and a torque converter (20) drivingly interposed the engine and transmission. At the beginning of a power downshift, the target gear is derived from the TC.sub.-- slip, vehicle deceleration, current gear and operator throttle demand. These four vehicle conditions are parameters of a four dimensional matrix such that increasing values of each parameter promote a greater potential for skip power downshifting.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.