System having a unit for controlling a transmission line

#This application claims the priority of German Patent Document No. 101 50 720.8, filed Oct. 13, 2001, the disclosure of which is expressly incorporated by reference herein.

#The invention relates particularly to a system having a unit for controlling a transmission line.

#International Patent Document WO 93/10378 A1 discloses a system of the above-mentioned type. The system has a control unit for controlling a transmission line of a motor vehicle, which has a transmission having a first plurality of wheel sets for engaging and disengaging transmission gears and a plurality of shift clutches. The shift clutches can be shifted by the operating units of an operating device. Two shift clutches are combined to form a shift stack, and two non-successive transmission gears are assigned to each shift stack.

#FIG. 1 is a schematic representation of a transmission;

#FIG. 2 illustrates diagrams for an upshifting operation under tension of the transmission from FIG. 1;

#FIG. 3 illustrates diagrams of a shifting operation which is an alternative to FIG. 2 and in which an opening speed of an input clutch is increased just before its opening position;

#FIG. 1 illustrates a schematically represented transmission with a control unit 10 for controlling the transmission or a transmission line of a motor vehicle which is not shown in detail. The transmission has six wheels sets 20, 21, 22, 23, 24, 25 for engaging and disengaging six forward transmission gears ZI, ZII, ZIII, ZIV, ZV, ZVI and three shift clutches S1,3, S2,4, S5,6 or synchronizing units which can be operated by an operating device 16 with three individual actuators 17, 18, 19 for engaging and disengaging the transmission gears ZI, ZII, ZIII, ZIV, ZV, ZVI. The illustrated automatic transmission is part of a transmission series with a manual transmission which is not shown in detail. For a conversion from the manual transmission to the automatic transmission, only the wheel sets 21, 22 for the second and third transmission gear ZII, ZIII are exchanged.

#Instead of an operating device 16 with several actuators 17, 18, 19, an operating device 14 with controller cylinders 15, 29 is also conceivable. In this case, by way of the first controller cylinder 15, two shift clutches S1,3, S5,6 can be shifted and, by way of the second controller cylinder 29, the shift clutch S2,4 can be shifted, as indicated in FIG. 1.

#In the case of a shifting operation under tension between the first and the second, the second and the third, the third and the fourth as well as between the fourth and the fifth transmission gear ZI, ZII, ZIII, ZIV, ZV, the control unit 10 leads the shift clutch S1,3, S2,4 or S5,6 to be shifted to its synchronization point, while the shifted shift clutch S1,3, S2,4 or S5,6 is still engaged. Furthermore, the control unit 10 leads an input clutch 11 formed by a friction clutch before the end of a synchronizing operation of the shift clutch S1,3, S2,4 or S5,6 to be shifted by way of an actuator 12 into its opening position.