WO2003048491A1

WO2003048491A1 - System for regulation of a piece

Info

Publication number: WO2003048491A1
Application number: PCT/DE2001/004354
Authority: WO
Inventors: Joachim Schenk; Frank Schmidt
Original assignee: Robert Bosch Gmbh
Priority date: 2001-11-20
Filing date: 2001-11-20
Publication date: 2003-06-12
Also published as: DE10197164D2; JP4106334B2; AU2002215865A1; EP1448863A1; EP1448863B1; JP2005511924A

Abstract

The invention relates to a system for regulation of a piece (10), in particular a lateral hinged window (10) on a motor vehicle, which may be rotated or tipped against at least one stopper strip (26), whereby an anti-clamping sensor (28) is arranged along the stopper strip (26).

Description

Part adjustment system

State of the art

The invention relates to a system for adjusting a part that is rotatable or tiltable by motor against at least one stop bar according to the preamble of the independent claim.

DE 198 49 245 Cl has disclosed a drive device for a movable part which, for example, opens and closes a side opening window of a vehicle. The side opening window is articulated on a chassis, for example the B-pillar of the vehicle, and can be moved from its closed position into the open position and back again by means of an electromotive actuator. The electric motor is connected to the side opening window via a reduction gear that drives a drive shaft, by means of a ball head at the end of the drive shaft and a corresponding ball socket.

If the driver now automatically actuates such a side opening window by means of a switch on the dashboard, there is a risk that body parts on their own passengers (children) in the back seat can be trapped and not insignificantly damaged.

Advantages of the invention

The system according to the invention with the features of the main claim has the advantage that the pinching of an object or body part in a motor-operated side opening window is detected in time by a pinch protection sensor arranged along the stop bar. Thus, regardless of the open state of the side window, a risk of injury by pinching can be effectively prevented.

Advantageous further developments of the system according to the main claim are possible due to the features listed in the subclaims. In contrast to the window lift principle of a lift-actuated side window, the side opening window presses against a certain point on the stop bar at the start of the closing process. It is therefore particularly advantageous that the anti-trap sensor has two electrical conductors along the stop bar, with a predetermined resistance. Their resistance preferably changes depending on their length. As a result, the pressure point is identified locally along the stop bar and a distinction between a pinching event and a normal closing process is thus made possible. The stop bar should therefore not fall below a certain elasticity in order to ensure that a locally limited pressure point occurs on the one hand during the closing process and on the other hand in the event of a pinch.

The arrangement of the electrical conductors is particularly favorable such that a pressure against the stop bar electrical contact occurs between the two conductors. Due to this short circuit generated depending on the location, one has a measurand for the location of the pressure point on the stop bar.

The resistance is advantageously measured between the two open conductor ends at the opposite end of the electrical contact. This measured resistance value decreases continuously when the opening window closes without interference, so that the resistance measurement curve of the normal closing process can be separated from the resistance measurement value of a pinching event.

When the side opening window is closed by turning or tilting, the pressure point moves less quickly along the stop bar on the side of the joints or axis than on the side with the open conductor ends when the condition is almost closed. It is therefore particularly favorable that the resistance of the electrical conductors increases disproportionately from the open ends on the resistance tap to the side of the window joints. This enables a higher, more uniform spatial resolution of the pressure point to be achieved over the entire stop bar.

The system-specific determination of the closed position of the window by means of the measured resistance value allows the window to be opened and closed in a controlled manner. This also enables a problem-free approach to any intermediate position. This eliminates the need for additional position sensors (Hall sensors) for the adjustment process.

Of particular interest is the detection of a pinching event due to the sudden increase in Resistance measurement. As a result, the motor can be reliably stopped and reversed in individual cases, which largely prevents the risk of injury.

The detection of the pinching position offers the possibility to determine the closing force at the pinching position by means of the distance to the window joints. As a result, the motor can advantageously be stopped and / or reversed as a function of a closing force limit value.

The system allows the thickness of the pinched object to be determined, so that the type of the pinched body part can be inferred. In this way, for example, the motor can be reversed faster in the case of a suspected finger than, for example, in the case of an arm. If the force to be applied by the drive during the closing process is measured at the same time, the type of the object to be pinched can be determined even more precisely from the thickness of the object being trapped and the observed increase in force. This means that the error rate is reduced by adapting the pinch protection to the thickness and thus to the presumed nature of the pinched object.

In a further exemplary embodiment, it is particularly advantageous to arrange an elastic conductive plastic between the two parallel electrical conductors. If the pane or the clamped object presses against the stop bar, this plastic is pressed together and its resistance is reduced. This principle corresponds to the electrical contact in the first exemplary embodiment, but has the advantage that the two electrical conductors return exactly to their starting position when the window is opened or the jammed object is removed. This deformable conductive plastic creates reproducible conditions and is inexpensive to manufacture. The elastic properties of the plastic also enable the pinch protection to be triggered depending on the closing force.

The arrangement of the electrical conductors within an elastic hollow profile is advantageous, since this protects them from dirt and weather influences. The elasticity of the hollow profile also ensures that the two conductors return to their starting position when pressure is no longer exerted on the stop bar.

It is particularly favorable if the anti-trap sensor takes over the function of a seal or is integrated in a seal in order to ensure that the side opening window is closed in a watertight and burglar-proof manner. Such a combined solution is inexpensive, saves installation space on the window frame and does not require any structural changes to the same.

By continuously measuring the resistance between the two conductor ends, the anti-trap sensor is constantly checked for functionality. A cable break or short circuit is immediately recognized and indicated that the pinch protection is not working.

drawing

In the drawing, an embodiment of a system according to the invention is shown and explained in more detail in the following description. FIG. 1 shows an exemplary embodiment of a system for adjusting a side opening window, FIGS. 2a and 2b each show a diagram of the resistance measurement value at 1, and FIGS. 3a-3c each show cross sections of different variants of an anti-trap sensor according to FIG. 1.

Description of the embodiment

The exemplary embodiment shown in FIG. 1 shows a system according to the invention for adjusting a side opening window 9, in which a pane 10 is fastened to the frame 16 of the window, for example the B-pillar of a motor vehicle, by means of joints 12 or an axis of rotation 14. The disk 10 can be moved by means of a motor 18 which is operatively connected via a ball head 22 of a threaded spindle 20 to a ball socket 24 attached to the disk 10. To adjust the disc 10, it is rotated about the axis of rotation 14 against a stop 26, so that the disc 10 closes like scissors. If the joints 12 are designed in such a way that the disk 10 also undergoes a translational movement in addition to the rotary movement when opening and closing, this is referred to as tilting against the stop bar 26. Along the stop bar 26 there is an anti-trap sensor 28 which has essentially two parallel electrical conductors 30 running at a short distance from one another. The electrical conductors 30 are formed as metal wires with a constant cross section, so that their total resistance increases in proportion to their length 32. The two conductors 30 are connected to one another at their ends 34 at the joints. On the other hand, between the two open ends 36 of the conductor 30, the resistance is continuously measured by means of an ohmmeter 38, and the measured value is fed to a control unit 39 which controls the motor 18. If the pane 10 is now closed, starting from the closed end 34 of the conductors 30 (l aχ), it presses them against one another, so that they touch at the pressure point 40 and produce an electrical contact 42. In the course of the closing, the pressure point 40 and consequently also the electrical contact 42 migrates from the closed end 34 of the conductors 30 to their open end 36 when the window is closed (lg). The resistance measured on the ohmmeter 38 increases from a starting value 44 continuously. Such a change in resistance for a trouble-free closing process is shown in the diagram in FIG. 2a. If the change in resistance is proportional to the length 32 of the conductor 30, the decrease in resistance over the length of the anti-trap sensor 28 represents a straight line. The starting value 44 of the resistance when the window is open (l _ax ) corresponds to the total resistance of the two connected conductors 30. When the window 9 is closed If the two conductors 30 are short-circuited along their entire length 32, the measured resistance approaches zero. If, for example, the closed end 34 of the two conductors 30 were left open, the starting value 44 of the resistance would be infinite with the window 9 open and would only jump to the starting value 44 of the resistance when the two conductors 30 are pressed together when the closing process begins. The measured resistance curve allows an unambiguous assignment of the pressure point 40 to a position on the anti-trap sensor 28. However, this function is not identical to the measured resistance value in relation to the displacement path of the disk 10 along the threaded spindle 20. This function shows a much smaller change in resistance with the almost open one Window 9 compared to the almost closed window 9. Since the pinching probability is the same over the entire length of the stop bar 26, in a variant of the exemplary embodiment the two conductors 30 can be designed such that their resistance increases disproportionately towards their closed ends 34 depending on their length 32. The easiest way to do this is to taper the conductor cross-section 46 (see FIGS. 3a-3c) towards the joints 12. Another possibility is to modify the conductor material so that its specific resistance increases continuously towards the joints 12. This enables a uniform position resolution with respect to the adjustment path along the threaded spindle 20 to be achieved. In the simplest case, the adjustment path of the spindle 20 is proportional to the time. A corresponding curve 43 of the measured resistance value is shown in dashed lines in FIG. 2a. It clearly shows the disproportionate increase in resistance with the length 32 of the conductor 30.

There is now an object 45 of a certain extent between the disk 10 and the

Anti-trap sensor 28, a sudden drop 47 of the resistance value is measured when the window 9 is closed. The associated resistance curve is shown in Figure 2b. The resistance value drops continuously when the window 9 is closed until the pane 10 presses the object 45 against the anti-trap sensor 28 and establishes an electrical contact 42 between the two conductors 30. As a result, the resistance value at the pressure point 40 (lg) of the continuous closing process jumps to the resistor 46 at the pinching point. The control unit 39 recognizes this sudden drop in resistance 47 as a trapping situation and stops the motor 18 and / or reverses the same. The resistance value 46, which after the abrupt drop 47 sets, corresponds to a position on the pinch protection sensor 28 of the undisturbed closing curve and thus indicates the position of the pinching event lg. Similarly, the amount 49 of the drop in resistance 47 corresponds to a certain path along the anti-trap sensor 28 in the undisturbed closing process. If the angular geometry of the opening window 9 is known, this path directly represents a measure of the thickness of the jammed object 45. The control unit 39 can process this information to determine the triggering threshold for stopping / reversing the motor 18.

FIGS. 3 a to c show different variants of the anti-trap sensor 28 in cross section. In Figure 3a, the two electrical conductors 30 are arranged in parallel within an elastic hollow profile 48, for example made of fabric-reinforced rubber. The hollow profile 48 must be so elastic that the disc 10 or the pinched object 45 in the direction of arrow 50 always only make an electrical contact 42 at points along the anti-pinch sensor 28. On the other hand, the hollow profile 48 must be so rigid that it reproducibly sets the two conductors 30 back into their original position after the external pressure has been removed. A T-double profile 52 is attached on one side, which engages in a corresponding profile in the window frame 16. In FIG. 3b, the two conductors 30 with a circular cross section 53 are replaced by two conductors 30 with a flat, rectangular cross section 54, which are connected to one another by means of an electrically conductive, deformable plastic 56. This plastic 56 has a relatively high electrical resistance in the pressure-free state. If the pane 10 or the object 45 presses this pinch protection sensor 28 along the arrow 50, the plastic 56 compressed. Its resistance is considerably reduced, so that this reduction in resistance corresponds to the generation of an electrical contact 42. The conductive plastic 56 also has the property that it returns to its old shape and its original resistance value under pressure relief. The plastic 56 and a protective sheath 58 surrounding it are designed in such a way that the electrical contact 42 between the two conductors 30 with a flat, rectangular cross section 54 in the longitudinal direction along the anti-trap sensor 28 only occurs at certain points.

In order to effectively seal the pane 10 against the window frame 16 when it is closed, the anti-trap sensor 28 from FIG. 3b is arranged within a sealing profile 60, shown in FIG. 3c. The material of the seal 60 is optimized with regard to its sealing properties, and the conductive plastic 56 with regard to its reduction in resistance. The shape of the seal 60 is adapted to the shape of the frame 16 and the disc 10. However, direct integration of the electrical conductors 30 into the sealing profile 60 is also possible, as shown in FIG. 3a.

Since the resistance of the system is measured continuously, the control unit 39 determines as soon as one of the two conductors 30 is broken, since then an approximately infinite resistance of the anti-trap sensor 28 is established. It is also monitored whether the two conductors 30 return to their original position when opening and removing the jammed object 45 by comparing the measured resistance with the recorded reference curve of the undisturbed closing process. Such a pinch protection sensor 28 is used in a side opening window 9 of a motor vehicle ideally installed on the upper and lower stop bar 26. No spatially resolved detection of a pinching event is necessary for a vertical stop bar, since here the disc 10 presses against the stop bar over the entire length of the stop bar only immediately before the closed state. Nevertheless, the same anti-trap protection sensor 28 can also be used for this bar and linked accordingly via the control unit 39. The system for adjusting a rotatable or tiltable part is not limited to motor vehicles.

In summary, the functioning of the system according to the invention is described in the following steps. The resistance between the open ends 36 of the two conductors 30 is measured. When the disc 10 is closed, the two conductors 30 are pressed against one another, starting from the closed end 34 (l _ma χ). The decrease in resistance is checked for continuity or compared with a reference curve. In the case of trouble-free closing, a moving closed position lg of the disk 10 is assigned to the measured resistance value. If a sudden drop in resistance 47 occurs, the motor 18 is stopped and / or reversed.

Optionally, the amount 49 of the resistance drop 47 is measured and the pinching position lg of the object 45 is determined therefrom. The thickness of the same is determined from the difference between the closed position 1g of the pane 10 and the clamping position 1g of the object 45. The pinch position lg and the thickness are used to determine the triggering threshold of the pinch protection. If an approximately infinite resistance occurs, it is indicated that the pinch protection is not functional.

Claims

claims

1. System for adjusting a part (10), in particular a side opening window (10) of a motor vehicle, which can be rotated or tilted by motor against at least one stop bar (26), characterized in that an anti-trap sensor (28) is arranged along the stop bar (26) is.

2. System according to claim 1, characterized in that the anti-trap sensor (28) has two substantially parallel, spaced electrical conductors (30), the resistance of which increases as a function of their length (32).

3. System according to claim 2, characterized in that the part (10) comes to rest when closing along the stop bar (26), and presses the two electrical conductors (30) against one another such that an electrical contact (42) is generated.

4. System according to claim 3, characterized in that at the opposite end (36) of the electrical contact (42), the resistance between the two conductors (30) is tapped and the measurable resistance value of the Pinch protection sensor (28) decreases continuously during trouble-free closing.

5. System according to claim 4, characterized in that the resistance of the electrical conductors (30), starting from their ends on the resistance tap (36), increases disproportionately depending on their length (32).

6. System according to any one of claims 4 or 5, characterized in that the measured resistance value corresponds to a certain closed position of the part (10) when trouble-free closing.

7. System according to one of claims 4 to 6, characterized in that when the measured resistance value drops suddenly (47), the motor (18) is stopped and / or reversed.

8. System according to claim 7, characterized in that the measured resistance value (46) after its drop (47) indicates the position of a jammed object (45).

9. System according to one of claims 7 or 8, characterized in that the thickness (49) of the pinched object (45) is determined from the amount (49) of the resistance value.

10. System according to any one of claims 2 to 9, characterized in that between the two parallel, spaced electrical conductors (30) a conductive, deformable plastic (56) is arranged, the resistance of which is reduced by compression.

11. System according to one of claims 2 to 10, characterized in that the two parallel, spaced electrical conductors (30) are arranged within an elastic hollow profile (48).

12. System according to one of claims 1 to 11, characterized in that the anti-trap sensor (28) is designed as a seal (60) or is integrated in a seal (60).

13. System according to one of claims 1 to 12, characterized in that the anti-trap sensor (28) is continuously checked for its functionality by means of a continuous resistance measurement.