Patent ID: 6205388
Filing Date: 2001-03-20
Classification: F16H

Abstract:
A process for evaluating start-up in an automatic transmission of a vehicle via an electronic transmission control device having a calculation unit, a micro-controller, a memory device and a control device for controlling a hydraulic transmission control device, the process comprising the steps of:issuing a signal associated with engine torque (MM) and engine speed (nM), from an engine control device (27) to the electronic control device (11), and issuing, a signal associated with one of a torque (MT) and a speed (nT) of a turbine shaft (18) from a measuring device (24) at the turbine shaft (18) of a converter (2) of the automatic transmission (1);determining, via the electronic transmission control device (11), a maximum value (Max) of a time-related difference (DIFF(t)) between one of (a) the engine torque (MM) and the torque (MT) of the turbine shaft (18), and (b) the engine speed (nM) and the speed (nT) of the turbine shaft (18);assigning an overall theoretical driver-type value (FTSoll n) to the maximum value (Max) of the difference (DIFF(t));comparing the overall theoretical driver-type value (FTSolln) to an actual driver-type value (FTIst) and adjusting a counter (39); anddetermining from the counter (39) a specific gear change operating characteristic curve (SL) that characterizes a certain start-up style and issuing a control signal to the hydraulic transmission control device (10).