WO2024227726A1

WO2024227726A1 - Method for operating an electromotive door adjuster

Info

Publication number: WO2024227726A1
Application number: PCT/EP2024/061727
Authority: WO
Inventors: Daniel Steiner; Maximilian Rau; Daniel Schnapp
Original assignee: Brose Fahrzeugteile Se & Co. Kommanditgesellschaft, Bamberg
Priority date: 2023-05-04
Filing date: 2024-04-29
Publication date: 2024-11-07
Also published as: DE102023204147A1

Abstract

The invention relates to a method (26) for operating an electromotive door adjuster (14) of a motor vehicle (2), the door adjuster comprising an electric motor (16) and an door (10) driven by the electric motor. During adjustment of the door (10) by means of the electric motor (16), acceleration (30) of the door (10) is determined and compared with a limit value (42). A panic intervention (36) is identified if the acceleration (30) is greater than the limit value (42). The invention also relates to an electromotive door adjuster (14).

Description

Method for operating an electromotive door adjustment

The invention relates to a method for operating an electromotive door adjustment of a motor vehicle and an electromotive door adjustment.

Motor vehicles, such as passenger cars, usually have a number of doors that cover an opening in the body of the motor vehicle. Each door is usually mounted on the body of the motor vehicle so that it can move by adjusting the door, so that the opening in the body can be released. If the door is a side door, it is possible to enter the interior of the motor vehicle and/or load objects into the interior.

To increase comfort, the door is usually driven by an electric motor of an electromotive door adjustment, which also includes the door. When the electric motor is operating, the door is moved along an adjustment path that is specified by the bearing by which the door is mounted on the body. It is possible that a user of the electromotive door adjustment cannot fully see an adjustment area of the door formed around the adjustment path and, for example, activates the electromotive door adjustment even though there is an object in the adjustment area. The adjustment area is the area that the door moves through when adjusting along the entire adjustment path and is defined by the outer contour of the door. It is also possible that an object moves into the adjustment area while the electric motor is operating and thus while the door is being adjusted. It is therefore possible that a small child can reach into the adjustment area or an animal can enter it. It is also possible that a user inadvertently the electric motor door adjustment is activated from outside, for example when a small child is still inside the vehicle.

If one of these occurs, the user's instinctive reaction is to pull on the door and prevent it from being adjusted, or to reverse the direction of adjustment so that, for example, the object is not trapped. Because the door is operated manually, comparatively large forces are applied to the door, which act on the mechanism between the door and the electric motor, and which are greater than in normal operation. In order to ensure that the electromotive door adjustment can continue to operate, it is necessary to adapt the electromotive door adjustment to this comparatively rare application, and consequently to increase its robustness and/or provide an overload clutch. However, this increases material costs and weight.

The invention is based on the object of specifying a particularly suitable method for operating an electromotive door adjustment of a motor vehicle and a particularly suitable electromotive door adjustment of a motor vehicle, wherein manufacturing costs and/or weight are advantageously reduced, and wherein a service life is expediently increased.

With regard to the method, this object is achieved according to the invention by the features of claim 1 and with regard to the electromotive door adjustment by the features of claim 7. Advantageous further developments and embodiments are the subject of the respective subclaims.

The method is used to operate an electromotive door adjustment of a motor vehicle. The motor vehicle is in particular land-based and preferably multi-lane. In this case, it is suitably possible to position the motor vehicle essentially freely, in particular on a roadway. For this purpose, the motor vehicle expediently has corresponding wheels. In summary, it is preferably possible to position the motor vehicle essentially independently of other conditions on land. With other In other words, the motor vehicle is suitably not rail-guided. Preferably, the motor vehicle is a passenger car (car) or a commercial vehicle, such as a lorry (truck) or bus.

The electromotive door adjustment comprises a door that is driven by an electric motor, preferably along an adjustment path. In the assembled state, the door is suitably mounted movably by means of a bearing on a body of the motor vehicle. For example, the bearing is designed in the manner of a hinge and the door is mounted pivotably with respect to the body. Alternatively, the bearing is used to at least partially achieve longitudinally displaceable mounting of the door, so that the door is a sliding door. The door is preferably a side door.

A further component of the electromotive door adjustment is expediently arranged mechanically between the electric motor and the door, such as a component that can be varied in length, in particular a spindle. Alternatively or in combination with this, a cable drum is arranged between them. Preferably, a gear is initially driven by the electric motor, such as a worm gear, by means of which the spindle is expediently driven. In particular, the electric motor is fixed to the body in the assembled state, which makes assembly easier. Alternatively, the electric motor is attached to the door. The electric motor is, for example, a brushed commutator motor or, particularly preferably, a brushless direct current motor (BLDC). The electromotive door adjustment suitably comprises a control device or other control unit, by means of which an electric current is provided and/or regulated to energize the electric motor, so that the electric motor is operated according to a specific specification. The electric motor expediently comprises a sensor for detecting an adjustment position and speed, such as a speed sensor, by means of which a speed of the electric motor can be detected during operation. The sensor preferably comprises a Hall sensor. Due to the mechanical coupling between the electric motor and the door, it is possible to determine the speed at which the door is moved. In addition, it is also possible to determine the Position of the door is also preferably determined during operation using the speed sensor.

The door has a door body. In particular, the door body is at least partially rigid and is preferably mounted on the body by means of any bearing. The electric motor preferably acts on the door body. The shape of the door body is in particular not changeable and it has, for example, a door module and/or part of an outer skin of the motor vehicle. A window pane of the door is held on the door body and is preferably adjustably mounted there. The window pane is suitably a component of an electromotive window lifter that is attached to the door body.

The method provides that the door is first adjusted using the electric motor. In other words, the electric motor is operated in such a way that the door is adjusted. This preferably takes place as a function of a signal that is generated, for example, by a user of the motor vehicle, who is also referred to as the user. In particular, an input device is operated to generate the signal. The input device is, for example, a component of the electromotive door adjustment and in particular a door handle that is expediently arranged on the door body. Alternatively, the signal is generated when a gesture made by the user is detected using a suitable sensor, preferably without contact. In this case, the sensor is, for example, a component of the electromotive door adjustment or is spaced apart from it. In particular, there is a signaling connection between the electromotive door adjustment and the sensor or the input device, provided that this is not a component of the electromotive door adjustment. The signaling connection preferably comprises a bus system. Alternatively or in addition, the signal for adjusting the door is given by means of an on-board computer of the motor vehicle, which is expediently coupled to the electromotor door adjustment by means of the bus system, if applicable. It is particularly preferred if the door is adjusted automatically using the electric motor. In other words, it is not necessary for a user to apply additional force to the door in order to adjust it. In summary, the force applied to the door by the electric motor is sufficient to adjust it. In particular, this is what is known as automatic operation.

While the door is being adjusted, the acceleration of the door is determined and compared with a limit value. The limit value is, for example, constant or dependent on the current position of the door. In particular, the comparison is only made when the door is in a certain position or in a certain area. Preferably, however, the acceleration of the door is determined along the entire adjustment path and compared with the limit value.

If the acceleration is greater than the limit value, a panic intervention is detected. A panic intervention occurs in particular when the user manually operates the door, i.e. when additional force is applied to the door that is not applied by the electric motor. A panic intervention occurs, for example, when the user wants to stop adjusting the door relatively suddenly, for example because there is an object in the adjustment area, or because adjusting the door was unintentional and could lead to a dangerous situation. Preferably, the absolute value of the acceleration is used as the acceleration for the comparison. In other words, a panic intervention is only detected if the absolute value of the acceleration is greater than the limit value.

The limit value is suitably selected in such a way that it is not exceeded when the door is adjusted using the electric motor. The limit value is suitably selected in such a way that it is not reached during (current) normal operation of the electric motor. In particular, the limit value depends on the current current supply to the electric motor, preferably a current PWM frequency and/or a duty cycle. Consequently, the current control of the electric motor is used to determine the limit value and/or to verify that the panic intervention has occurred. Alternatively or in combination with this, a current speed of the door or rotational speed of the electric motor is used for determination/verification.

If the acceleration is less than the limit value, there is, for example, only a stiff movement or something similar. In this case, the electric motor in particular continues to operate and is preferably regulated to a certain speed so that the door is adjusted evenly.

In summary, the method reliably detects the panic intervention based on the acceleration of the door, which is functionally related to the forces acting on the door. Since the panic intervention is detected, it is possible to react to it so that the load on the electromotive door adjustment, for example the electric motor and/or a mechanism between the electric motor and the door, is reduced. It is therefore not necessary to design the electromotive door adjustment to be relatively robust, which is why manufacturing costs and weight are reduced and the service life of the electromotive door adjustment is increased.

For example, the message is issued when the panic intervention has been detected. A warning tone or similar is suitably emitted to signal to the user and/or any object located in the adjustment path that the panic intervention has been detected. This also alerts any object that the door has been adjusted, so that it can, for example, move itself out of the adjustment path/adjustment area.

It is particularly preferable to adjust the power supply to the electric motor when the panic intervention has been detected. In particular, the force applied to the door by the electric motor is reduced, so that the overall forces acting are reduced. Consequently, any stress on the mechanics or other components of the electric motor door adjustment is reduced. In other words, due to the adjustment of the power supply, the forces acting on the door and/or the mechanics between the electric motor and the door are reduced, so that damage to the door is avoided.

In this case, for example, the force applied by the electric motor is reduced to such an extent that the door can no longer be adjusted independently. The electric motor door adjustment is therefore expediently switched to a mode in which manual adjustment of the door is supported, in particular a so-called servo mode. In this mode, the force applied to the door by the electric motor is not sufficient for the door to be moved by itself. In this case, the electric motor in particular continues to be energized in the direction of rotation in which it was energized up until the door was adjusted. This means that the door can still be adjusted in the original direction of movement.

However, it is particularly preferred for the electric motor to be energized in such a way that a force is applied to the door in the direction of acceleration. Consequently, when the panic intervention is detected, the electric motor is energized in such a way that the force is applied to the door in the direction of acceleration. Suitably, the direction in which the force acts is first determined. For example, any existing speed sensor is used for this, which in particular comprises the Hall sensor. The force acting during the panic intervention leads to the acceleration of the door, which, due to the mechanical coupling, leads to a forced rotation of the electric motor. It is therefore possible to use the speed sensor to determine the direction in which the force acts. Since the current supply to the electric motor is adjusted in such a way that the force is applied in the direction of acceleration, the forces acting between the door and the electric motor are reduced, which avoids damage. The user's panic intervention is also strengthened so that the door is moved to the position desired by the user. The user can therefore feel that the panic intervention has been recognized and this is activated when the door is moved to the desired position. Position is supported, so that there is an increase in comfort and safety. For example, the direction of rotation of the electric motor is the same as the direction of rotation that it had when adjusting the door. Alternatively, the direction of rotation is opposite to the original direction of rotation.

In an alternative embodiment, for example, the power supply to the electric motor is stopped when the panic intervention is detected. The electric motor is expediently put into freewheel mode and in particular no electrical potential is applied to any of the poles of the electric motor, so that the electric motor can rotate relatively freely. This makes it easier for the user to move the door to a desired position, whereby no force applied by the electric motor needs to be compensated. Particularly preferably, after the panic intervention is detected, the electric motor is first energized in such a way that the force acting in the direction of acceleration is applied to the door, so that a comparatively high acceleration of the door initially occurs and, for example, a moment of inertia is safely absorbed, particularly if the direction of rotation of the electric motor is changed for this purpose. Following this, the power supply to the electric motor is expediently stopped so that the door can be moved to the position desired by the user. This further increases comfort.

To determine the acceleration of the door, a speed of the electric motor is preferably determined and the acceleration is appropriately derived from this. The electric motor and the door are connected to one another, preferably rigidly, via any mechanism. There is thus a functional connection between the acceleration of the door and the acceleration of the electric motor. Consequently, an existing speed sensor can be used to determine the acceleration of the door, which is used, for example, to control the adjustment speed of the door. This further reduces manufacturing costs. In particular, a direct comparison of the acceleration of the electric motor with the limit value is carried out. In other words, the acceleration of the electric motor is used as the acceleration of the door. Alternatively, the door, for example, includes an acceleration sensor that is attached to the door body, for example. This means that, particularly if the mechanism between the door and the electric motor has play and/or elasticity, the acceleration is detected relatively early, especially before a force is exerted on the electric motor or it is accelerated accordingly. This makes it possible to adjust the current supply to the electric motor at an early stage. If the force acting on the door is opposite to the original direction of movement, the current supply to the electric motor can be changed before its direction of rotation is reversed due to the mechanical coupling. This further reduces the load on the electric motor.

The electromotive door adjustment is a component of a motor vehicle in the assembled state and is suitable for this purpose, in particular intended and set up. The motor vehicle is, for example, land-based and, for example, a truck (lorry), bus or preferably a passenger car (car). The electromotive door adjustment comprises an electric motor and a door driven by it. In particular, the door is driven along an adjustment path that is specified by a bearing by means of which the door is mounted. The electromotive door adjustment is operated according to a method in which an acceleration of the door is determined during an adjustment of the door using the electric motor and compared with a limit value. A panic intervention is recognized if the acceleration is greater than the limit value. For example, the acceleration is recorded when the door is adjusted in any direction. Alternatively, this only occurs when the door is adjusted in a certain direction, such as when performing a closing movement.

The electromotive door adjustment has in particular a control unit that is provided and set up to carry out the method. The control unit comprises, for example, an application-specific circuit (AS IC) or particularly preferably a computer that is suitably designed to be programmable. In particular, the control unit comprises a storage medium on which a computer program product, also referred to as a computer program, is stored, wherein when this computer program product, i.e. the program, is executed, the computer is caused to carry out the method. The electromotive door adjustment or at least the motor vehicle expediently has several control elements by means of which an adjustment request can be created. The adjustment request in this case is in particular a signal depending on which the adjustment of the door takes place. The control elements are expediently connected to the control unit by signaling, in particular via a bus system. The door is, for example, a side door which, in the assembled state, is mounted in particular pivotably on a body of the motor vehicle. The invention further relates to a motor vehicle with such an electromotive door adjustment.

The invention further relates to a computer program product. This comprises a number of commands which, when the program (computer program product) is executed by a computer, cause the computer to carry out a method for operating an electromotive door adjustment of a motor vehicle, which comprises an electric motor and a door driven thereby. In the method, an acceleration of the door is determined during an adjustment of the door by means of the electric motor and compared with a limit value. A panic intervention is recognized if the acceleration is greater than the limit value. The computer is expediently a component of a control unit or electronics and is formed by means of this, for example. The computer preferably comprises a microprocessor or is formed by means of this. The computer program product is, for example, a file or a data carrier which contains an executable program which, when installed on a computer, automatically executes the method.

The invention further relates to a storage medium on which the computer program product is stored. Such a storage medium is, for example, a CD-ROM, a DVD or a Blu-Ray disc. Alternatively, the storage medium is a USB stick or another storage device, which for example rewritable or can only be written to once. Such a memory is, for example, a flash memory, a RAM or a ROM.

The invention further relates to a control device that is provided and set up to carry out a method for operating an electromotive door adjustment of a motor vehicle, which comprises an electric motor and a door driven thereby. In the method, an acceleration of the door is determined during an adjustment of the door by means of the electric motor and compared with a limit value. A panic intervention is recognized if the acceleration is greater than the limit value. The control device has, for example, an application-specific circuit (AS IC) and/or a microprocessor, by means of which the method is at least partially carried out. In particular, the control device comprises a computer program product that is stored in a memory and that, when the program is executed by a computer, such as the microprocessor, causes the computer to carry out the method. Preferably, the control device is a component of the electromotive door adjustment in the assembled state and is suitable for this purpose, in particular provided and set up. For example, the control device is a door control device. For example, any electromotive window lifter that is integrated into the door is also controlled by means of the control device. The electric motor window lifter preferably comprises a further electric motor by means of which the window pane is driven.

The further developments and advantages explained in connection with the method are also to be transferred mutatis mutandis to the electromotive door adjustment/the motor vehicle/the computer program product/the storage medium/the control unit as well as to each other and vice versa.

An embodiment of the invention is explained in more detail below with reference to a drawing. In the drawing: Fig. 1 shows a schematic side view of a motor vehicle with an electromotive door adjustment, which has an electric motor and a door,

Fig. 2 a method for operating the electromotive door adjustment,

Fig. 3 the time course of a rotational speed of an electric motor during an adjustment of the door,

Fig. 4 the temporal course of a force acting on the door during the adjustment of the door, and

Fig. 5 shows the time course of an acceleration of the electric motor during the adjustment of the door.

Corresponding parts are provided with the same reference numerals in all figures.

Figure 1 shows a simplified schematic representation of a motor vehicle 2 in the form of a passenger car. The motor vehicle 2 has several wheels 4, by means of which contact is made with a roadway (not shown in detail). The wheels 4 are connected by means of a chassis to a body 6 of the motor vehicle 2, on which a door 10 is also pivotably mounted by means of a hinge 8. For this purpose, a door body 12 of the door 10 is attached to the hinge 8.

The door 10 is a component of an electromotive door adjustment 14, which also has an electric motor 16. The electric motor 16 is designed as a brushless direct current motor (BLDC) and is attached to the body 6. A spindle (not shown in detail) that is supported on the door body 12 is driven by the electric motor 16 via a worm gear. Thus, when the electric motor 16 is energized, the door 10 is adjusted and the door 10 is driven by the electric motor 16.

The electromotive door adjustment further comprises a control unit 18, which comprises a computer 20 in the form of a programmable microprocessor. The control unit 18 also comprises a storage medium in the form of a memory 22 on which a computer program product 24 is stored. The computer program 24 includes a number of commands which, when the computer program is executed by the computer 20, cause the computer 20 to carry out a method 26 shown in Figure 2 for operating the electromotive door adjustment 14. In other words, the electromotive door adjustment 14 is operated according to the method 26, and the control unit 18 is provided and set up to carry out the method 26.

The method 26 is carried out when the door 10 is adjusted by means of the electric motor 16. The adjustment of the door is started in particular when a control element, i.e. an input device, of the motor vehicle 2 has been operated by the user, wherein in particular a corresponding adjustment request, i.e. a signal to adjust the door 10, has been generated. This takes place, for example, by manually operating a door handle (not shown in detail) of the door 10, which is attached to the outside of the door body 12. Alternatively, a corresponding control element is arranged in an interior of the motor vehicle 2, and/or the adjustment request is generated by means of an on-board computer (not shown) of the motor vehicle 2, which is connected to the control unit 18 by means of a bus system. In the method 26, in one variant, the electric motor for adjusting the door 10 is energized in accordance with the adjustment request, or this takes place in another method that runs in parallel.

In a first step 28 of the method 26, an acceleration 30 of the door 10 is determined. In one embodiment, a rotational speed 32 of the electric motor 10 is used for this purpose, the temporal progression of which during the adjustment is shown in Figure 3. During normal operation 34, the rotational speed 32 is comparatively low and is regulated to a predetermined value for adjusting the door 10.

At one point in time, a panic intervention 36 is carried out by a user (not shown in detail), in which the user also manually pulls on the door 10. In the example shown, the adjustment of the door 10 is to take place at an increased speed. The reason for this is, for example, that the User wants to get into the interior of the motor vehicle 2 relatively quickly, for example because a small child located there has an emergency. Due to the manual action on the door 10 and the mechanical coupling of the electric motor 16 to the door 10, the rotational speed 32 increases comparatively sharply. Due to the manual action, the force 38 acting between the door 10 and the electric motor 16, the temporal progression of which is shown in Figure 4, has a peak. Consequently, the temporal progression of the acceleration 30, which is shown in Figure 5, also has a peak when the panic intervention 36 occurs, whereas in normal operation 34 the acceleration after the start of the adjustment of the door 10 is essentially zero, so that the door 10 is moved at an essentially uniform speed.

In summary, in normal operation 34 the door 10 is essentially adjusted at a constant speed, which is why the force 38 acting between the electric motor 16 and the door 10 is comparatively low. In contrast, during the abrupt acceleration 30 of the door 10 during the panic intervention 36, a comparatively large force 36 acts between the electric motor 16 and the door 10 due to the inertia of the electric motor 16. As a result, the speed 32 of the electric motor 16 subsequently changes comparatively significantly.

Thus, the rotational speed 32 corresponds to the acceleration 30 of the door 10, and this is determined based on the rotational speed 32 of the electric motor 16. A time derivative of the rotational speed 32 of the electric motor 16 is used as the acceleration 30 of the door 10. In a variant not shown in detail, this is additionally multiplied by a factor that is determined based on the mechanical coupling of the electric motor 16 to the door 10.

In a subsequent second step 40, the acceleration 30 is compared with a limit value 42. The acceleration 30 is compared with the limit value 42 without a sign, i.e. the amount of the acceleration 30. If the acceleration 30 is greater than the limit value 42, the panic intervention 36 is detected. The limit value 42 is selected such that it is not reached in normal operation 34, since the electric motor 16, for example, has a has too little power. In this case, the limit value 42 is in particular constant. Alternatively, the limit value 42 is variable and is selected in particular based on the speed of the door 10, i.e. the rotational speed 32 of the electric motor 16. The limit value 48 is preferably adjusted depending on the current supply to the electric motor 16, preferably depending on a duty cycle with which the electric motor 16 is operated, i.e. in particular depending on a force applied by means of the electric motor 6. In this case, the limit value 42 corresponds in particular to twice or 1.5 times the force applied by means of the electric motor 16. The limit value 42 is thus only exceeded if an additional force is applied, namely the force applied by the user to the door 10 during the panic intervention 36.

If the panic intervention 36 is present, a third work step 44 is carried out. In this, the power supply to the electric motor 16 is adjusted. The electric motor 16 is initially powered in such a way that a force is applied to the door 10 that acts in the direction of the acceleration 30. Consequently, the user is supported in their manual operation of the door 10, so that on the one hand the door 10 is opened comparatively quickly. On the other hand, the force 38 acting between the door 10 and the electric motor 10 due to the manual operation of the door 10 is reduced in this way, which avoids damage to the electromotive door adjustment 14. To determine in which direction the acceleration 30 is directed, the speed 32 of the electric motor 16 is evaluated. The change in the direction of movement is determined based on the speed 32 of the electric motor 16.

If the user 10 changes the adjustment movement of the door 10 by means of the panic intervention 36, for example by opening the door 10 during a closing process by means of the panic intervention 16, the direction of current supply to the electric motor 16 is also changed so that it now drives the door 10 to an opening movement.

In this case too, the force 38 acting between the door 10 and the electric motor 16 is reduced, thus preventing damage to the electric motor-driven door adjustment 14. After the initial application of the force to the door 10 after detecting the panic intervention 36, the power supply to the electric motor is 16 is terminated, so that the user can now move the door 10 to a desired position without having to compensate for forces applied by the electric motor 16. In other words, the power supply to the electric motor 16 is terminated.

In the variant shown here, however, the electric motor 16 is operated in the direction in which the user has applied the force to the door 10 until an end position of the adjustment path is reached. The electromotive door adjustment 14 then switches back to normal operation 34, so that the first and second work steps 28, 40 are again carried out. In the example shown, another panic intervention 46 takes place, so that the power supply to the electric motor 16 is adjusted again.

In an alternative embodiment of the electromotive door adjustment 14, the door 10 has an acceleration sensor 48 which is attached to the door body 12. By means of this, the acceleration 30 of the door 10 is measured directly and the limit value 42 is adjusted accordingly. In this variant, it is possible to adjust the current supply to the electric motor 16 at an early stage so that the force 38 acting between the door 10 and the electric motor 16 is further reduced.

In both variants, due to the reduction in the force 38 acting between the electric motor 16 and the door 10, excessive stress on the electric motor door adjustment 14, in particular the mechanics, is reduced and peak forces are absorbed. It is therefore not necessary to design the electric motor door adjustment 14 to be comparatively robust, which is why manufacturing costs are reduced. It is also not necessary, for example, to provide an overload clutch between the electric motor 16 and the door 10, which is why manufacturing costs for the electric motor door adjustment 14 are further reduced.

Furthermore, the mounting point of the electromotive door adjustment 14 on the body 6 is subjected to less stress, so that robustness can also be reduced there. This makes it possible to use a comparatively thin sheet metal for Creation of the body 6 in this area, which leads to a reduction in weight and material costs. It is also possible to use an existing electromotive door adjustment 14, wherein the control unit 18, in particular the computer program product 24, is adapted so that the method 26 can be carried out.

The invention is not limited to the embodiment described above. Rather, other variants of the invention can also be derived from this by the person skilled in the art without departing from the subject matter of the invention. In particular, all individual features described in connection with the embodiment can also be combined with one another in other ways without departing from the subject matter of the invention.

list of reference symbols

2 motor vehicles

4-wheel drive

6 body

8 hinge

10 doors

12 door bodies

14 electromotive door adjustment

16 electric motors

18 control unit

20 computers

22 storage units

24 computer programs

26 cases

28 first step

30 acceleration

32 rpm

34 Normal operation

36 panic interventions

38 Force

40 second step

42 limit

44 third step

46 further panic interventions

48 acceleration sensor

Claims

claims

1. Method (26) for operating an electromotive door adjustment (14) of a motor vehicle (2), which comprises an electric motor (16) and a door (10) driven thereby, in which

- during an adjustment of the door (10) by means of the electric motor (16), an acceleration (30) of the door (10) is determined and compared with a limit value (42), and

- a panic intervention (36) is detected if the acceleration (30) is greater than the limit value (42).

2. Method (26) according to claim 1, characterized in that a current supply to the electric motor (16) is adjusted when the panic intervention (36) has been detected.

3. Method (26) according to claim 2, characterized in that the electric motor (16) is energized in such a way that a force is applied to the door (10) which acts in the direction of acceleration.

4. Method (26) according to claim 2 or 3, characterized in that the current supply to the electric motor (16) is terminated.

5. Method (26) according to one of claims 1 to 4, characterized in that the acceleration (30) of the door (10) is determined based on a rotational speed (32) of the electric motor (16).

6. Method (26) according to one of claims 1 to 4, characterized in that the acceleration (30) of the door (10) is measured by means of an acceleration sensor (48) of the door (10).

7. Electromotive door adjustment (14) of a motor vehicle (2), which comprises an electric motor (16) and a door (10) driven thereby, and which is operated according to a method (26) according to one of claims 1 to 6.