Ratio shift control system and method for a multiple-ratio automatic transmission
US8328688B2 · kind B2 · utility
13Cited by
8References
35Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 18, 2010 |
| Grant date | Dec 11, 2012 |
| Priority date | — |
| Expiry date | Jun 15, 2031 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2342/044
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A control system and method for controlling a multiple gear ratio automatic transmission in a powertrain for an automatic transmission having pressure activated friction torque elements to effect gear ratio upshifts. The friction torque elements are synchronously engaged and released during a torque phase of an upshift event as torque from a torque source is increased while allowing the off-going friction elements to slip, followed by an inertia phase during which torque from a torque source is modulated. A perceptible transmission output torque reduction during an upshift is avoided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.