Method for shifting a gear in a multi-stage gearbox of a motor vehicle as a function of the drive input shaft rotational speed
US7806804B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 27, 2010 |
| Grant date | Oct 5, 2010 |
| Priority date | — |
| Expiry date | Jan 27, 2030 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2306/50
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
Method for shifting, in particular engaging and/or disengaging, gears in an automatic multi-stage gearbox of a motor vehicle, wherein the gearbox comprises a drive input shaft (18) connectable to an engine drive output shaft (16) by means of a friction clutch (12) which acts as a separating clutch (12), and a drive output shaft (20) couplable to a drive wheel or to drive wheels of the motor vehicle, wherein a shift process takes place, in particular only, as a function of rotational speeds (n) of the shafts, wherein each gear is assigned a synchronizing device (36), which acts as a shift clutch, in order to connect the drive input shaft (18) to the drive output shaft (20), comprising the following steps: setting the separating clutch (12) into a dragging position such that a low, preferably predefined, drag torque is transmitted from the engine drive output shaft (16) to the drive input shaft (18), which drag torque is sufficient to bring a rotational speed (nIS) of the drive input shaft (18) when the shift clutch (36) is open to a rotational speed (nM) of the engine drive output shaft (16); adjusting the rotational speed of the engine drive output shaft (16) to a predetermined val…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.