Drive device for movable structural component units

#The invention is based on a drive device for movable structural component units, particularly in vehicles, such as window lifters, sliding-roof actuators, mirror adjusters and the like.

#More particularly, it relates to a drive device for movable structural component units, which has a reversible electric motor with a rotor shaft driveable in two rotating directions, and a control device for switching on the motor in a predetermined rotating direction of the rotor shaft at switch-on command.

#An example of such a drive device for movable structural component units is an electric-motor window lifter in which the desired actuating process of the side window panes of the vehicle can be triggered by actuating one of two selection switches for "window closing" and "window opening". The triggered process of "window closing" or "window opening" runs automatically as long as the respective selection switch remains actuated and is interrupted when the end position is reached by opening an end switch. The end switches have already been replaced in modern systems by electronics with Hall sensors which switch off the drive motor when the end position is reached or when there is an obstacle in the window movement path (jamming protection).

#FIG. 1 shows a block wiring diagram of a drive device for a window lifter in motor vehicles;

#FIG. 2 shows a wiring diagram of a control device in the drive device in FIG. 1;

#FIG. 3 shows a block wiring diagram of an evaluating unit in the control device according to FIG. 2;

#The drive device for a window lifter in a motor vehicle shown in the block wiring diagram in FIG. 1 has an electric d.c. motor 10 which is excited by a permanent magnet and whose rotor shaft 11 can be driven in two rotational directions. The rotational movement of the rotor shaft 11 indicated at right in FIG. 1 is detected by a sensor 12. The sensor 12 is a Hall IC, known per se, which detects the number of revolutions of the rotor shaft in conventional window lifting devices, which information is then used for different control measures. It has a permanent magnet 13 which is connected with the rotor shaft 11 so as to be fixed with respect to rotation relative to it and two Hall elements 14, 15 which are arranged so as to be stationary at the rotor shaft 11 and are offset by 90.degree. relative to one another. Two output signals composed of a sequence of square pulses can be taken off at the two output channels 1 and 2 of the Hall IC 12. One pulse period characterizes a revolution of the rotor shaft 11. The pulse frequency is dependent on the rate of rotation of the rotor shaft 11. The two pulse sequences are electrically shifted in phase by 90.degree. relative to one another, so that the rotating direction of the rotor shaft 11 can be known from the direction of the phase shift.

#The drive device for the window lifter further has a control device 16 connected to a d.c. voltage source 35. The motor 10 is connected to its outputs a and b and an output channel 1 or 2 of the Hall IC 12 is connected to its inputs c and d. One switching contact of a selection switch 17 and 18, respectively, which is constructed as a key switch, is connected with the inputs e and f, respectively, of the control device 16. Its other switching contact is connected to an output "+" of the control device 16 carrying positive potential. The selection switch 17 is actuated for closing the window and the selection switch 18 is actuated to open the window. An end switch 19 and 20 is connected with the inputs g, h and i, k, respectively, of the control device 16. The two end switches 19, 20 are normally closed and are opened by the window lifter in the end positions of the window pane. The end switch 19 is opened in the "window closed" position and the end switch 20 is opened in the "window open" position.

#An embodiment example of the control device 16 is shown in FIG. 2 as a wiring diagram. In order to switch on the motor 10 in one rotating direction or the other two switch-on relays 21, 22 are provided whose relay windings 23, 24 are connected with the positive pole "+" of the d.c. voltage source 35 via the assigned end switch 19, 20 and the assigned selection switch 17, 18. Every switch-on relay 21, 22 has a double switching contact comprising switching contacts 25 and 26 or 27 and 28. In the closed state the switching contacts 25 and 27 connect the outputs a and b of the control device 16 with the positive pole "+" of the d.c. voltage source 35 and the switching contacts 26 and 28 connect the outputs b and a with the negative pole "-" of the d.c. voltage source 35.