Abstract: The invention relates to an automatic transmission of a motor vehicle which is controlled by an electronic transmission control system which continuously exchanges signals with a digital engine electronics system of an internal combustion engine. To reduce the thermal load on the automatic transmission in emergency operating mode, a transmission-independent program module (M1) of the digital engine electronics system sets an admissible maximum vehicle speed for the emergency operating mode (v_max_not) or an admissible maximum engine speed for the emergency operating mode (n_mot_max_not).

Abstract: An automatic transmission, in particular an infinitely variable automatic transmission for motor vehicles, contains a radial piston pump (1) for supplying a hydrodynamic converter (3), a lubricating device and control and actuating devices of the automatic transmission via a number of control conduits. Radially outside of its outlet valves, the radial piston pump (1) contains an annular chamber (22), which extends around the radial piston pump (1). The annular chamber (22) is embodied as a damping chamber and is mainly arranged in a recess (23) of the converter housing (2), and therefore almost completely outside of the pump housing (17). The annular chamber (22) is bordered by the recess (23) of the converter housing (2), the pump housing (17) and/or a separate pump cover (24). The annular chamber (22) is not symmetric and with its volume extends into the adjoining free spaces of the automatic transmission.