Patent ID: 7637833
Filing Date: 2009-12-29
Classification: F16H,Y10S,Y10T

Abstract:
1. A control apparatus for an automatic transmission in which a first gear ratio is implemented when a first frictional engagement element and a second frictional engagement element are in an engaged state and a third frictional engagement element and a fourth frictional engagement element are in a disengaged state, and a second gear ratio is implemented when said first frictional engagement element and said second frictional engagement element are in the disengaged state and said third frictional engagement element and said fourth frictional engagement element are in the engaged state, said control apparatus for the automatic transmission comprising: an operation unit, wherein said operation unit controls said first frictional engagement element and said second frictional engagement element so that, from a state where said first gear ratio is implemented, said first frictional engagement element and said second frictional engagement element start to enter the disengaged state, and wherein said operation unit controls said third frictional engagement element and said fourth frictional engagement element so that, after at least one of said first frictional engagement element and said second frictional engagement element completely enters the disengaged state, engagement of said third frictional engagement element and said fourth frictional engagement element is started to implement said second gear ratio.