Adaptive electronic transmission control system and strategy for nonsynchronous automatic transmission
US6278926A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 18, 2000 |
| Grant date | Aug 21, 2001 |
| Priority date | — |
| Expiry date | Sep 18, 2020 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2061/0087
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An adaptive electronic transmission control for an automatic transmission having multiple-ratio gearing establishing plural torque flow paths between a torque input member and a driven member, the relative motion of the elements of the gearing being controlled by a friction torque establishing member and an overrunning coupling connection between two gear elements of the gearing. A ratio shift is achieved by establishing a driving connection between a selected gearing element and a torque delivery shaft. The shift is achieved by controlling the capacity of the friction element using a fluid pressure actuator. Shift quality is optimized by establishing a bias pressure on a friction element accumulator and by using a feedback control system to control the rate of change of transmission ratio during the shift.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.