Siemens Aktiengesellschaft

Stefan Lauer

Friedrich Graf

Stephan Pindl

Martin Lachmayr

Bernd Last

Tanja Roy

Martin Manz

Tibor Kiss

The drivetrain of a motor vehicle with an engine, a crankshaft starter-generator, a hydrodynamic torque converter and an automatic gearbox, comprises an overriding drivetrain controller () with a driver and situation recognition (), a status controller () and a torque management (). The controller carries out the following functions: a start-stop operation, an increase in engine torque, a rolling of the vehicle on a non-engaged drivetrain and a regenerative braking operation.

Drivetrain on a motor vehicle and method for controlling a drivetrain

A method for controlling an automatic transmission in a drive train of a motor vehicle having a transmission controller selecting and shifting gears of the transmission includes determining a new gear by reference to gear shift characteristic curves and generating a gear shift instruction as soon as a working point of the drive train exceeds a gear shift characteristic curve. The transmission controller determines a new gear that is expected to be engaged shortly. If the new gear differs from the current gear, an initial phase of the gear shift is carried out and the gear shift is completed as soon as the gear shift instruction has been generated. The initial phase is carried out as soon as the working point drops below a predefined distance from the gear shift characteristic curve.

Method for controlling an automatic transmission and controller suitable for such a method

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Stefan Lauer