Patent ID: 6183393
Filing Date: 2001-02-06
Classification: F16H,Y10T

Abstract:
A method for reducing jerking during shifting in an automatic transmission driven by an internal combustion engine (1) with a selector lever (22) operable by a driver and having at least one forward drive (D) and one reverse drive (R) operating position, and one parking (P) and one neutral (N) position, the method comprising the steps of:closing a first clutch (K1) in the positions R, N and D (first gear);opening a second clutch (K2) when moving from the position D and shifting to N;opening a third clutch (K3) when moving from the position R and shifting to N; andwherein upon detection of a gear shift condition, reducing the pressure level of the first clutch (K1) from a first (p1(K1)) to a second (p2(K1)) pressure level, the second pressure level (p2(K1)) being above a slip limit so that the first clutch remains closed.