Patent ID: 6186923
Filing Date: 2001-02-13
Classification: F16H,Y10T

Abstract:
A method for carrying out an overlapping gear shift in an automatic transmission comprising the steps of:opening a first clutch (K1);closing a second clutch (K2);determining in a first phase of the overlapping gear shift a pressure curve of the first clutch (K1) by a transmission input rotational speed (nT);taking over a load of the first clutch (K1) by the second clutch (K2) in a second phase of the overlapping gear shift;closing completely the second clutch (K2) in a third phase of the overlapping gear shift;triggering an upshift from a first gear ratio (i1) to a second gear ratio (i2) without a time delay;detecting an abort criterion, said criterion corresponding to a down shift request presettable by a driver;interrupting the upshift without delay; andreturning to the first gear ratio (i1) when the abort criterion is present prior to a beginning of the third phase of the overlapping gear shift;wherein a spontaneity of the automatic transmission is increased.