Control for shift in automatic transmission
US5304102A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 21, 1992 |
| Grant date | Apr 19, 1994 |
| Priority date | — |
| Expiry date | Feb 21, 2012 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2059/385
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
There is proposed a practical approach to a shift, in an automatic transmission, in which a release element is released and an apply element is engaged. The release element is released or vented at an appropriate timing after development of torque by the apply element but before initiation of inertia phase. Specifically, the release element is released when transmission output torque (To) reaches a value (Toh) calculated out of gear ratio after shift (grmin), transmission input (or turbine) torque (Tt) and transmission input (turbine) acceleration (NTd). If desired, without relying on measurement of output torque (To), the release element may be released when transmission output acceleration (No), namely, vehicle acceleration, reaches a value which may be fixed or accelerator position dependent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.