Method for controlling upshift gearchanges in an automatic transmission

摘要

The process involves detection of the turbine mode by means of a target ((1) with eight teeth (2), fixed to the turbine shaft within the range of a variable-reluctance sensor (3) connected to a pulse shaper (4) which produces a square wave (6). The interval between transits of two consecutive teeth through the field of the sensor is measured, and its pseudo-derivative is filtered for comparison with a threshold recalculated after each change in transmission ratio.