Patent ID: 6370464
Filing Date: 2002-04-09
Classification: F16H,Y10T

Abstract:
A process for control of an automatic transmission (3) in which the actuation of a brake pedal (BR=1) initiates a downshift function (ZRS=1), wherein at the initiation of the function (ZRS=1), an electronic transmission control (4) calculates a new downshift point (RS(NEU)) with closed throttle valve (DKI=0) by adding to a basic downshift point (RS(ORG)) a characteristic value (K1) (RS(NEU)=RS(ORG)+K1), wherein the basic downshift point is determined from a shift characteristic field (SKF) by which are shifted the gear steps (i,i=1, 2 . . . n) of said automatic transmission (3) depending on vehicle speed (v) and throttle valve position (DKI) (SKF=f(v, DKI) and determining the characteristic value (K1) from a driving activity (FA) and a calculated brake pressure (pBR) via a characteristic field (K1=f(FA, Pbr)).