Method for controlling switching over of speed stages of transmission with presetting of due period
US4967355A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 6, 1988 |
| Grant date | Oct 30, 1990 |
| Priority date | — |
| Expiry date | Jul 6, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S477/908
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A method for controlling switching over of speed stages of a transmission for a vehicle having two transmission units each independently operable to provide a plurality of gear ratios and connected in series to provide a plurality of overall gear ratios by the addition or balance of the gear of the two transmission units, having sensors for detecting operational conditions of the vehicle such as engine load and vehicle speed, sensors for detecting rotational speed of those intermediate rotational members in the respective transmission units which start to rotate or to stop by switching over of the speed stages, and a computing and controlling means which computes based upon the vehicle operating conditions a due period in which the switching over is to be completed and controls servo actuators for switching over the gear ratios of the transmission units so that the switching over operations for the two transmission units are completed with the end of the computed period.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.