DE2150460A1 - Control circuit for the lifting mechanism of a motor vehicle window - Google Patents

Description

? ATENT4NWÄ11E DipWng. WERNER COHAUSZ Dipi.-lng. WiLHELM FLORACK. Dipl.-Ing. RUDOLF KNAUF

4 Düsseldorf, Sdiumannsfraße 97

Joseph Lucas (Industries) Ltd.
Great King Street
Birmingham / England

Control circuit for the lifting mechanism of a motor vehicle window

The invention relates to a control circuit for the lifting mechanism a motor vehicle window.

His control circuit according to the invention is characterized by a manually operated switch with a switched off Position, a first on position and a second on position, one in both directions rotatable electric motor, the first switched-on position of the switch in one direction for lifting the window and that of the second switched-on Position of the switch in a direction to lower the window revolves around a limit switch, the i »case of the Occurrence of an obstacle in the movement path of the window is switchable when the window is raised, and when switching the Limit switch actuatable means for reversing the direction of rotation of the motor even when switched on in its first A manually operated switch which remains in position, the means including a delay network such that the motor only runs for a set time to lower the window.

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With this arrangement, the window is lowered by a short amount Piece, and then it stops when there is an obstacle in the Movement path of the window while it is being opened «

The invention is described below on the basis of exemplary embodiments explained in more detail with reference to the drawings In the drawings are:

Fig. 1 is a circuit diagram illustrating an embodiment of the invention, w, and

FIG. 2 is a circuit diagram showing a modification of that shown in FIG Arrangement illustrated.

A minus and a plus power line 11 and 12 are with a vehicle battery 13 connected, the line 11 with Ground is connected. The circuit contains a p-n-p transistor 14 »its emission electrode with the line 12 and its collector connected to the line 11 via a relay winding 15 are. The winding 15 is two normally open contacts 15a and 15b assigned · The contact 15a is between the Lines 11 and 12 connected in legs with a further relay winding fc 16, which actuates two changeover contacts 16a and 16b.

To the circuit further comprises a displaceable in both directions of rotation in circulation electric motor are 17 for lifting and lowering of the window and a manually operable control switch 18 having a movable contact which is connected to the line. 11 The switch 18 has a switched off position, which is shown in the drawing, a first switched on position in which a connection between the line 11 and a terminal 19 takes place, and a second switched on position in which a connection between the line 11 and a Terminal 21 takes place. The terminal 21 is connected to the control electrode of the transistor 14 via a resistor 22, and the terminal 19 is connected in series via a resistor 23 and the changeover contact 16a

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connected to line 12. The terminal 19 is also over the changeover contact 16b connected to one side of the motor 17, the other side of which is connected to the line 12 via the changeover contact 16a. The changeover contact 16a interrupts in the energized position the connection to the line 12 from the resistor 23 and the motor 17 and closes another connection the contact 15a to the line 11. The changeover contact 16b interrupts in the excited position, the connection from motor 17 to terminal 189 and closes a connection via contact 15b Line 12.

The circuit further includes a limit switch 24, the may have any suitable shape and which is designed so that when an obstacle occurs between the window and the When the window is raised, the window frame closes when pressure is exerted on the limit switch by the obstacle of the limit switch takes place. The limit switch is in series with two resistors 25 and 26 between the lines 11 and 12 connected, a capacitor 27 being connected in parallel to the resistor 26 and the connection between the switch 24 and the resistor 25 is connected via a resistor 28 to the control electrode of the transistor I4.

In practice, assuming that the window is lowered, when the window is to be raised, the switch is activated 18 moves to its first switched-on position, in the current through the terminal 19, the contact 16b, the motor I7 and the contact 16a flows to line 12 to allow engine 17 to run. The resistor 23 is of course connected in parallel with the motor I7. The motor runs until the switch 18 returns to its off position. When the window is lowered is to be, the switch 18 is moved to its second on position and then one circuit is made of the Line 11 via contact 21 and resistor 22 to the control

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electrodes / emission electrode path of transistor 14 gesciiioöeeii, whereby the transistor I4 is turned on and consequently the Winding 15 is energized, resulting in a closing of the Eon clocks 15ä and 15b leads. Closing the contact 15a results in excitation of the winding 16, whereby the contacts 16a and 16b toggled will. Current can now be supplied from line 11 via the contact 15a »the contact 16a, the motor, the contact 16b and the contact 15b to line 12 flow, so that the motor in the opposite direction runs around to lower the window.

If at any time when the window rom motor booted up an obstacle enters the path of movement of the window which causes the limit switch 24 to close, the current flows through the limit switch 24 and the resistor 2Θ to switch the transistor 14 on. At the same time a fast charging of the capacitor 27 · A conduction of the transistor 14 leads to an excitation of the winding 15, whereby the contacts 15a and 15b are closed, so that the winding 16 is energized, and thereby the motor is in the opposite direction in Circulation offset, even if the switch 18 rests with its movable contact on the terminal 19. With the lowering of the window the obstacle is released, whereby the limit switch 24 can open again in order to disconnect the circuit from the line 11 to interrupt the control electrode of transistor 14. The transistor I4, however, after opening the switch 24, a certain Keeping it on for a while while the capacitor 27 discharges, so that the window by a certain piece is lowered and then stops. When the capacitor 27 turns has discharged and transistor I4 turns off, however, the window will not start opening again, even if the switch 18 is held in its first switched-on position, in which there is contact with terminal 19, where the winding 16 via the contact 16a, the resistor 23 and the terminal 19 is excited remains, although the contact 15a is opened when the Transistor I4 switches off «TJm to open the window again,

the switch 18 must be brought into its off position in order to de-energize the winding 16. Then he can Switch 18 can be brought into its first switched-on position, to open the window again.

Each time the limit switch 24 is closed, the motor receives current in the correct sense to lower the window. Bas window can therefore be opened at any time by pressing the limit switch. Although this is usually a nut This can also be a possible source of danger, insofar as it is an unintended one or willful activity is made possible. For example, could a child could open the rear window during strong blessing or at high speed, and besides, the motor could run out Electricity can be prevented from running, for a long time, by placing an obstacle against it when the window is fully lowered the limit switch is placed. A shutdown of the system with the help of a separate main switch, which is operated by the driver, may be regarded as satisfactory but conceivably the release of a trapped obstacle prevent if the main switch is turned off near the contact moment. A better solution is to only the connection from the limit switch 24 to the terminal 19 instead of to the movable contact of switch 18, as shown. With such an arrangement, the limit switch 24 only effective while the window is opening.

If this modification is used, there is the possibility of that when an obstacle is placed in the path of movement of the window, when the switch 18 is momentarily moved in its middle switched-off position before the switch 24 is opened, the obstacle is not released. Although such a case is unlikely, it can simply be eliminated by the arrangement shown in FIG. According to

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The illustration in FIG. 2 shows the switch 24 with the terminal 19 connected in series via a resistor 52 and a diode 31, being the connection between resistor 32 and the switch 24 is connected to line 12 via a capacitor 33, to which a resistor 34 is connected in parallel. The way of working is the same as in Fig. 1, except that of course the limit switch 24 only comes into effect when the movable Zontakt of the switch 18 engages the terminal 19, furthermore for a short time after switch 18 has returned to its off position. This short time is sufficient to ensure that an obstacle is not caught.

A further modification is also shown in FIG. 2, namely a diode 35 'which is connected in series with the resistor 23. It has been found that when the window is open and pressure is applied to the limit switch 24 before that of Hand-operated switch 18 is away from its upward position, the pressure then being constantly maintained, the motor can be kept energized while the window is open is. The diode 35 avoids this difficulty, and it will be understood that the diode can also be used in the arrangement shown in FIG may be included, provided that the arrangement is modified as described above is that the switch 24 with the contact 19 of the switch 18 is connected instead of with its «moving contact.

The patent is not required

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Claims (3)

11SÖ46Ö Control circuit for the hammemechanism of a motor vehicle window * gäteffrmzMebnet by a manually operable switch (18) with an off position, a first on position and a second on position, an electric motor (17) which can be set in rotation in both directions and which is switched on in the first Position of the switch (18) in one direction to lift del window and the second switched on position of the switch (18) in a direction to lower the window, a limit switch (24), which in the event of an obstacle in the path of movement of the window is switchable when the window is raised »and when the power switch (24) is switched, means for reversing the direction of rotation of the motor (17) even when the manually operated switch (18) remains in its first switched-on position, the means containing a delay network, such that the motor (17) only one festge put time to lower the window running * 2. Control circuit according to claim 1, characterized by means for coupling the Ihdlagenschalters (24) with the power supply through the manually obtainable switch (18), such that the limit switch (24) only comes into operation when the manually operable switch ( 18) is in the first switched-on position for lifting the window * 3. Control circuit according to claim 2, characterized in that the power supply for the limit switch (24) contains a capacitor which has a function of the limit switch (24) for a short time after the return of the manually operated switch (18) from its first switched-on position in its off position enabled; 25-5QS
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