Method for operating a multispeed transmission in a motor vehicle
AssigneeAudi AG
InventorMartin Enke
Life of this patent
Estimating the term…
Abstract
A method for operating a multispeed transmission in a motor vehicle, provided with planetary gearings which can be switched with four switching elements to different gear ratios, and which can be connected by input elements and output elements to a driven input shaft and to an output shaft. The reaction elements can be coupled or locked with a brake, wherein the four planetary gearings can be switched by two brakes and by three shifting clutches to eight forward gear ratios. In the higher gear ratios, at least one first shifting clutch is connected to produce a force flow in the transmission, and in the lower gear ratios, at least a second shifting clutch is connected to produce a force flow in the transmission.
Claims8
A method for operating a multispeed transmission in a motor vehicle, provided with four planetary gearings switchable to different gear ratios with four switching elements, which can be connected via input elements and output elements to a driven input shaft and to an output shaft and whose reaction elements can be coupled or locked by braking, wherein the four planetary gearings can be switched by two brakes and by three shifting clutches to eight forward gear ratios, wherein in the higher gear ratios, in particular the fourth through the eight gear ratio, at least a first shifting clutch is continuously connected, and in order to establish a force flow in the transmission, in the lower gear ratios, in particular the first through the third gear ratio, at least a second and/or a third shifting clutch is connected in order to produce a force flow in the transmission, and wherein in the coasting mode with an engaged or connected gear ratio, the force flow in the transmission is interrupted by opening one of the shifting clutches, wherein in order to provide the coasting mode in the higher gear ratios, the first shifting clutch is opened, and that in order to provide the coasting mode in the lower transmission ratios, the second or the third shifting clutch is opened.
Dependencies are inferred from the claim text.