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DESCRIPTION  
         [0001]    The invention relates to a method for adjusting a window pane of a motor vehicle with anti-trap protection, more particularly for a window pane of a cabriolet, according to the preamble of patent claim 1 and to a device for carrying out the method according to the preamble of patent claim 11. It is directed to improving the detection of jammed incidents in so-called scissor gaps which adjoin a side edge of the window pane.  
           [0002]    From DE 30 31 118 C2 a method is known for controlling a motor-driven window lifter with anti-trap protection which calculates on the basis of measured values of the drive train dynamic characteristic values of the window pane, such as e.g. speed and acceleration, and compares successive data with each other. If within the monitoring range for the adjustment speed of the window pane a deceleration is determined which lies outside a permissible range then a trapped incident is assumed and the window pane is moved in reverse.  
           [0003]    Using this detection principle, which is designed an indirect anti-trap protection, quite good results have been obtained when sensing trapped parts of the body and objects which stand directly in the way of the adjusting direction, but this did not however relate to monitoring so-called scissor gaps, as occur in cabriolets, coupes and rear windows. Considerable shear stresses can appear in these side gaps before the described indirect anti-trap protection responds. Safely restricting the jamming forces can scarcely be reached in this way.  
           [0004]    These problems can however be overcome by using a so-called direct detecting anti-trap protection such as for example by using an electric switch strip fitted along the edge of the pane or along the closing edge on the body side associated therewith. This system has the drawback however that the switch strips may have to be incorporated in the design of the vehicle and additional costs may be incurred. A corresponding system is described in DE 197 20 713 C1.  
           [0005]    The object of the invention is therefore to provide with simple means an anti-trap protection which ensures high functional reliability even for side scissor gaps.  
           [0006]    This is achieved according to the invention through the characterising features of patent claims 1 and 11. The dependent claims provide preferred variations of the invention.  
           [0007]    According to this it is proposed that during the closing process in a first phase a window pane is moved substantially vertically (in the Z-direction) between an at least partially opened and a practically completely closed position whilst maintaining an acute-angled gap which widens out in the closing direction between the side edge of the pane and an associated closing edge of a further window pane or a bodywork part, and that then in the second phase of the closing movement the window pane undergoes a substantially horizontal displacement (in the X-direction) and/or a rotational movement about the transverse axis (Y-axis).  
           [0008]    It is thereby possible to use a cost-effective passively detecting anti-trap protection with which it is possible to monitor as the window pane is closed first the substantially vertical movement phase and then the substantially horizontal movement phase. Shear stresses on any object which might possibly be trapped can practically no longer occur since as a result of the wedge-shaped gap which opens out in the closing direction the object is pushed in the direction of movement and is not restricted. The objects which engage in the so-called scissor gap are also subjected in the last phase of the closing movement only to the usual pressure strains as occur during the substantially vertical closing movement.  
           [0009]    In order to reverse the path of movement according to the invention the adjusting mechanism has suitable guide slides or guide rails which control the path of the window pane through slide elements which are moved thereon. The slide elements are in active connection with a drive device of an adjusting mechanism and thus transfer the adjusting force to the window pane. Instead of guide slides or guide rails the phases of the vertical and horizontal adjusting movement of the window pane can also be controlled through a lever gearing. The acute angled gap between the side edge of the pane and an associated closing edge is kept constant during the vertically directed closing movement in order to ensure that during this phase nothing can be trapped. There is however also the possibility of slightly widening out the acute angled gap during the closing movement.  
           [0010]    A preferred use of the invention stems from a simultaneous triggering of a closing command for two window panes which by their two side edges form a common closing area. The adjusting movements of the two window panes are controlled electronically and matched with each other so that between the side edges inside the region of the at least partially opened and the practically completely closed pane positions there always remains a non-constricting acute angled gap. The adjusting movement of the two window panes can thereby run synchronously so that the two window panes reach their closing positions simultaneously. In the last phase of the closing movement the window panes execute a substantially horizontal displacement (in the X-direction) and/or a rotational movement about the transverse axis (Y-axis).  
           [0011]    Before the second and last phase of the closing movement of the window pane is executed in order to reach the fully closed window position, the upper edge of the pane should form with the associated outer contour of the body sealing area at the most such a narrow gap that it is not possible to insert parts of the body. Preferably the upper edge of the window pane is already located in part in the sealing area so that the upper edge is covered by the sealing profile.  
           [0012]    Naturally the adjusting movement of the two window panes can also run asynchronously so that these reach their closing positions one after the other. A first window pane in the last phase of its closing movement thereby executes a substantially horizontal displacement (in the X-direction) and is operated at a higher adjusting speed than the second window pane which in the last phase of its closing movement executes a rotational movement about the transverse axis (Y-axis) whereby the first window pane reaches its closing position before the second window pane.  
           [0013]    In the event that only the first window pane was opened and the second window pane remains closed after triggering a closing command at first the second window pane should be opened at least in part until a sufficiently large (defined) acute angled gap has arisen. After the opening of the second window pane or even during the opening process the first window pane can be moved into the closing position. The second window pane is then closed.  
           [0014]    In order to safeguard that the window pane at the conclusion of the second phase of the closing movement has actually reached its fully closed position a second press into the substantially vertical direction (Y-direction) is recommended. To this end a control of the drive in the said direction for a fraction of a second is generally sufficient.  
           [0015]    The electronics unit which serves for the anti-trap protection function also controls the adjusting mechanics and movement sequences of the two window panes corresponding to a program filed in an electronic memory. 
       
    
    
       [0016]    The invention will now be explained in further detail with reference to the embodiments illustrated in the drawings in which:  
         [0017]    [0017]FIG. 1 a  shows a diagrammatic view of two adjustable window panes of a coupe in a partially opened position with a conical gap opening in the closing direction between the side edges of the pane;  
         [0018]    [0018]FIG. 1 b  as FIG. 1 a,  but in a practically completely closed position;  
         [0019]    [0019]FIG. 1 c  as FIG. 1 b  but after the conical gap has been closed;  
         [0020]    [0020]FIG. 1 d  as FIG. 1 c  but after an additional slight adjusting movement of the two window panes in the vertical direction;  
         [0021]    [0021]FIG. 2 shows a diagrammatic view of a rear door of a motor vehicle with a partially lowered window pane wherein a gap which opens in the closing direction is provided between the side piece on the C-pillar side and the associated side edge of the window pane. 
     
    
       [0022]    The embodiment illustrated in FIGS. 1 a  to  1   d  and described below shows a number of phases of the adjusting movement of two window panes  1  and  2  which goes far beyond that which utilises the principle of the invention. The core of the invention actually exists in the maintaining of a conical gap  111  which opens in the closing direction between a side edge  11  of the window pane and a closing edge  21 ,  51  associated therewith, namely during the entire adjustment of the window pane  1  from an at least partially opened position to a practically fully closed position. This can generally be reached with simple movement sequences which have no more than two successive movement phases. The timed sequence of these movement phases is thereby not to be understood within a strict sense since simultaneous action is not essential so long as the need for the non-constricting wedge-shaped gap  111  is taken into consideration. The wedge-shaped side gap  111  is only closed when there is no more risk of entrapment between the upper edge  10  of the window pane  1  and the lower edge  30  of the associated sealing area  3  of the bodywork.  
         [0023]    The diagrammatic illustration of FIG. 1 a  shows the partially opened window panes  1  and  2  of a cabriolet or coupe where on the bodywork side only the so-called girth line  4  of the vehicle and the sealing area  3  associated with the upper edges  10 ,  20  of the panes are indicated. Whereas the window pane  1  mounted in the vehicle door (not shown) is in many cases moved by cable or arm window lifters the displacement of the substantially smaller window pane  2  which is to be lowered in the vehicle body takes place generally by means of a so-called path-controlled window lifter where the window pane can be moved simultaneously in the Z and X direction along curved guide slides and pivoted in the X-Z plane. These technical means which are known per se are designed, and the travel over the adjustment path of the window panes  1 ,  2  is controlled, so that during the overall adjusting process the window panes  1 ,  2  include an acute angled gap  111  between the side edges  11 ,  21  of the window panes between the at least partially opened and a practically completely closed pane position.  
         [0024]    This gap  111  arises as the window pane  2  is lowered as a result of a swivel movement about a swivel axis  22  which lies according to this embodiment in an extension of the side edge  21  underneath the window pane  2 . Naturally the swivel axis  22  can also be provided at another point in dependence on the structural conditions. For completeness only it should be pointed out that furthermore or in place of the window pane  2  the other window pane  1  can be swivelled or tilted anti-clockwise in order to observe the desired wedge shaped gap  111  which opens in the closing direction (Z-direction).  
         [0025]    The opening angle α of the wedge-shaped gap  111  can be kept very small (for example 1 degree) for lowering the risk of injury in comparison with the known scissor gaps where during the closing process the gap width as a rule decreases continuously. In principle it would be sufficient if a constant gap width could be guaranteed over the relevant adjustment path. As a result of the unavoidable tolerances it therefore appears advantageous to provide structurally at least a small opening angle α. The greater the opening angle α and the width of the gap  111  the lower the risk of injury therefore.  
         [0026]    From the position illustrated in FIG. 1 a  the window panes  1 ,  2  can be moved synchronously into the substantially closed position, as shown in FIG. 1 b,  wherein the upper edges  10 ,  20  of the window panes  1 ,  2  lie already inside the sealing region  3 , without however having already to reach the sealing stop. The window panes  1 ,  2  are thereby moved along the adjusting directions  100 ,  200  parallel to the withdrawing line  110 .  
         [0027]    The window pane  2  can where applicable also be moved along the adjusting direction  200 ′ wherein the gap width would increase, and the sensitivity regarding a trapped incident between the upper edge  20  of the window pane and the seal  3  which is inclined sharply in this area would be improved. Furthermore a swivel movement about an axis  22  in the clockwise direction can also be superimposed on this movement along the adjusting direction  200 ′, which would lead to an enlargement of the opening angle α. In the event of a closing movement along the adjusting direction  200 ′ the swivel movement can take place about the axis  22  also anticlockwise but only to such an extent that the gap width which widens out as a result of the closing direction  200 ′ which is inclined to the withdrawing direction  110  is not overcompensated by the contra swivel movement. Restriction of the gap  111  and reduction of the opening angle α are not permissible.  
         [0028]    After the situation shown in FIG. 1 b  has been reached the gap  111  can be closed by a swivel movement about the swivel axis  22  in the direction  201 . Any object which might possibly be present in the gap  111  can be detected by the anti-trap protection device safely and by guaranteeing comparatively small jamming forces since this movement phase in the direction  201  has comparable conditions regarding the closing movement in the direction  200 ,  200 ′ (in the direction of the sealing area ( 3 ).  
         [0029]    At the same time as the swivel movement of the window pane  2  in the direction  201  where necessary a horizontal displacement movement of the window pane  1  can take place in the direction  101 . In this case lowering of the window pane  1  would involve a displacement in the driving direction, e.g. in order to achieve a rapid separation of the side edge  11  of the pane from the sealing element  210  which is formed on the side edge  21  of the other window pane  2 .  
         [0030]    After reaching the situation shown in FIG. 1 c  where necessary a second press of the window panes  1 ,  2  into the substantially vertical adjustment direction (phases  102 ,  210 ) can be proposed in order to reach a sealing stop  31  with the upper edges  10 ,  20  of the pane. It is thus guaranteed that a completely closed situation is reached (see FIG. 1 d ).  
         [0031]    In addition to the substantially simultaneous adjustment of the window panes  1  and  2  described with the aim of achieving the closed positions as simultaneously as possible the adjustment of the window panes  1 ,  2  can however also take place in succession with different adjusting speeds or with only partially synchronously running movements. Which of the many possible design variations is to be selected depends on the structural factors such as in particular the adjusting kinematics and other peripheral conditions (e.g. the requirements of the automobile manufacturer).  
         [0032]    [0032]FIG. 2 shows diagrammatically a rear door of a motor vehicle with a partially opened window pane  1 . The window pane  1  is located in a state tilted about the swivel axis  12  so that its side closing edge (on the C pillar side) includes with the associated closing edge  51  of the associated side piece  5  of the window frame a wedge-shaped gap  111  which opens in the closing direction. During the closing movement the gap  111  is not restricted. Only after the upper edge  10  of the window pane has projected into the sealing area or forms with the lower edge  30  of the sealing area  3  still only such a small gap that parts of the body (more particularly fingers) can no longer be clamped, is the window pane  1  swivelled back into the vertical position corresponding to the swivel curve  101 ′. The edges  10 ,  11  of the window pane are again aligned parallel to the associated regions of the seal  3 . When necessary a second press can then take place in the vertical direction  100  in order to ensure that the upper edge  10  of the pane has actually reached the sealing stop  31 .  
       LIST OF REFERENCE NUMERALS  
       [0033]    [0033]                                        1   Window pane        10   Upper edge of pane        11   Side edge of pane        12   Swivel axis       100   Adjusting phase: substantially vertical adjustment           direction (displacement in Z-direction)       101   Adjusting phase: substantially horizontal adjustment           direction (displacement in Y-direction)       101′   Adjusting phase: substantially horizontal swivel direction       102   Adjusting phase: substantially vertical adjustment direction       110   Withdrawing line of front window pane, parallel to side           edge of front window pane       111   Conical gap        2   Window pane        20   Upper edge of pane        21   Side edge of pane        22   Swivel axis       200   Adjusting phase; substantially vertical adjustment direction           (displacement in Z-direction)       200′   Adjusting phase; substantially vertical adjustment direction           (displacement in Z-direction)       201   Adjusting phase; substantially horizontal swivel direction       202   Adjusting phase; substantially vertical adjustment direction       210   Sealing element, formed on the side edge of the window pane        3   Sealing area on body side        30   Lower sealing edge        31   Sealing stop        4   Girth line        5   Side piece on C-pillar side        51   Closing edge        6   Side piece on B-pillar side       α   Angle

Summary:
The invention relates to a method for adjusting a window glass of a motor vehicle, with anti-trap protection, in particular on a cabriolet or coupe, with a motor-driven and electronically controlled adjustment mechanism. In a partly open position of the window glass a gap exists between a side edge of the glass and an adjacent glass edge of a further window glass, or of a chassis component, for example, the pillar of a door frame. Said gap is closed on closing the window glass by means of a movement in the Z- and X-axes. The invention is characterised in that the window glass moves essentially vertically (in the Z-axis), on going from the at least partly opened position to an almost completely closed glass position, whilst maintaining a vertical gap, between the side edge of the glass and an adjacent sealing edge of a further window glass or a chassis component and, in the last phase of the closing process, an essentially horizontal displacement (in the X-axis) and/or a rotatory movement of the window glass occurs about the tansverse axis (Y-axis).