Speed ratio controller and control method of automatic transmission
US6146307A · kind A · utility
8Cited by
4References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 23, 1999 |
| Grant date | Nov 14, 2000 |
| Priority date | — |
| Expiry date | Jun 23, 2019 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H61/18
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
In a vehicle automatic transmission, a controller (61) feedback controls a speed ratio command signal by proportional/integral/differential (PID) control so as to minimize a deviation between a transient target speed ratio and a real speed ratio. When a difference between the command signal and that of the preceding control cycle is larger than a predetermined value, the controller (61) prohibits the increase of an integral correction amount of the PID control in the next control cycle. In this way, continuous increase of the feedback correction amount while the transmission can not follow the command signal is suppressed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.