Patent ID: 6819987
Filing Date: 2004-11-16
Classification: F16H,Y10S

Abstract:
A Method for early recognition of abnormal occurrences in the operation of automatic and automated transmissions, comprising the following steps:after an n-th shift between a certain original gear Gexit and a certain target gear Gtarget at least one variable Anon-positive indirectly or directly characterizing the strain on the elements to be coupled to each other in a non-positive fit is continuously determined, at least until the synchronous speed is reached or during a maximum shift period Tmax; the variable Anon-positive characterizing the strain on the elements to be coupled to each other in a non-positive fit is mathematically combined with the time, or if more than one variable Anon-positive exists, said variables are mathematically combined with each other, and the result of said combination is added up in the form of a variable Wsum; the result is compared with a first pre-definable or defined threshold value Wmax0, which, if exceeded, defines a state in which damage is expected causing the breakdown of the transmission unit if operation is continued or massive interference in the function of at least one of the elements involved in the transmission of power and elements causing the transmission of power during a shift between the certain original gear and the target gear Gtarget, and where the shift action is aborted, and if said threshold value is not reached, an investigation is performed of developing damage on the elements involved in the transmission of power in at leas one of the original gear Gexit and the elements causing the transmission of power in the target gear Gtarget and precautionary measures with regard to the operation of the transmission are initiated.