Method for controlling system pressure of automatic transmission of motor car, involves determining target system pressure based on input torque, speed of drive assembly, transmission-side temperature, and pressure characteristic zones

摘要

The method involves providing two temperature-dependent system pressure characteristic zones for each gear of a transmission (2). A target system pressure for operating modes of the transmission outside of switching, and for other operating modes of the transmission for performing switching is determined based on a transmission input torque, a rotational speed of a drive assembly (1), a transmission-side temperature, and pressure characteristic zones. To and fro exchange between the characteristic zones is carried out with hysteresis. An independent claim is also included for a transmission control device.