| abstract |
Control device for an automatic transmission with stepped ratios comprising a torque converter (1) provided with bridging means (6, 6 '), a planetary gear train (2), several hydraulic receivers (E i , F i ) ensuring the switching of the planetary gear train (2), and a hydraulic distributor (16, 17) delivering a line pressure PL, which makes it possible to selectively supply the receivers (E i , F i ) under the control of an electronic computer , according to information concerning the running of the vehicle equipped with the transmission, characterized in that at least one switching element (8) is dimensioned so as to be able to slide in a controlled manner, in particular when the converter (1) is bridged, in response to a momentary decrease in the line pressure PL, and in that this slip is controlled by means of the line pressure PL, at set values depending on the torque Cm and the speed of the motor ω m. |