Method of controlling automatic transmission

Details Method of controlling automatic transmission Method of controlling automatic transmission

F - Mech Eng,Light,Heat,Weapons

16

H

F16H 59/46 (2006.01) B60K 23/00 (2006.01) F16H 61/16 (2006.01) F16H 59/50 (2006.01) F16H 59/58 (2006.01)

Patent

CA 2442427

To provide a method of controlling an automatic transmission which enables a vehicle to smoothly turn around corners with an accelerator depressed. A control method is applied to an automatic transmission which is downshifted to increase a gear change ratio when a rate of increase of throttle opening is above a preset value The method comprises: deciding a slip determining threshold on the basis of a steering angle B of a vehicle; detecting rear wheel speeds Vs; averaging the rear wheel speeds V s and deriving an average vehicle speed Va; and prohibiting the downshift of the automatic transmission when a difference between the rear wheel speeds and the average vehicle speed exceeds the slip determining threshold T and the rear wheels are determined to be slipping.

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