Device for adjusting the height of a headlight alignment testing device

Abstract

The present invention relates to a device, a method, and a computer program for adjusting the height of a headlight alignment testing device.

Description

[0001] Device for adjusting the height of a headlight aiming tester

[0002] The present invention relates to a device, a method, and a computer program for adjusting the height of a headlight aiming test device (SEP).

[0003] For adjusting and measuring a vehicle's headlights, a headlight aiming device (SEP) is often used. This device checks the headlight's alignment and helps ensure correct adjustment. For this purpose, the SEP is positioned in front of the headlight to measure its light distribution. Ideally, the SEP should be positioned at a specific height relative to the headlight, for example, the same height as the headlight itself. Generally, the heights at which a vehicle's headlights are positioned vary from manufacturer to manufacturer and from vehicle type to vehicle type. Furthermore, a vehicle typically has several types of headlights, each positioned at different heights.For example, a vehicle's high beam headlights may be positioned higher than its low beam headlights or fog lights. Therefore, it is often necessary to adjust the height of the SEP (Search Engine Position Sensor) to match the headlight being measured.

[0004] The height of the SEP is usually adjusted manually by the user based on optical criteria. Some SEPs provide aids for this purpose, such as scales embossed on the front of the housing or cross lasers directed at the headlight.

[0005] Furthermore, methods for aligning headlight testing devices are known from EP 2 463 620 Bl and EP 3 516 363 Bl. According to EP 2 463 620 Bl, the alignment of the testing device to the motor vehicle is automatically determined by the testing device based on data acquired by a data acquisition device, and if necessary, a correction calculation is performed by a data processing device. EP 3 516 363 Bl relates to a headlight aiming test device with a lens that directs an image of the tested headlight onto a monitor, with a data storage device that stores the height difference between the contact surface of a rear wheel located on the side of the respective tested headlight and the contact surface of the corresponding front wheel, or a value corresponding to this height difference, and with a correction option for the position of the image on the monitor that takes the respective height difference or value into account.

[0006] However, adjusting the height of the SEP can still be difficult for the user in some cases, or may only be done inaccurately.

[0007] The present invention was designed to at least partially solve the aforementioned problems and is intended to enable simple height adjustment and height setting of a SEP and to ensure the necessary accuracy of the height setting for adjusting the headlight using the SEP.

[0008] To solve the problem, a device, a method and a computer program for adjusting the height of a SEP according to the independent claims are proposed.

[0009] According to a first aspect of the invention, a device for adjusting the height of a headlight aiming test device (SEP) is proposed.

[0010] The device includes an actuator for moving the SEP in a vertical direction. For the purposes of this disclosure, an actuator can be understood as a device capable of setting the SEP in motion, at least in a vertical direction.

[0011] In particular, an actuator can be understood as a device that can cause the SEP to move by a predetermined distance. A device that can effect movement such that the moved element is positioned at a predetermined location can also be considered an actuator. The actuator can, for example, comprise an electrically driven motor. The actuator can, for example, be a linear actuator. The actuator can, for example, have a range of motion of more than 50 cm, in particular more than 100 cm or more than 120 cm, and / or, for example, less than 200 cm, in particular less than 150 cm. In some embodiments, the actuator can comprise a spindle that is rotated by a predetermined angle, with the SEP being attachable to an associated spindle nut. The rotation of the spindle can thereby achieve a linear movement of the SEP.In some embodiments, the actuator may include a gear and a rack. In some embodiments, the actuator may also include a movable chain or belt to which the SEP is attached.

[0012] Furthermore, the device for adjusting the height of a SEP (Single-Electric Pump) includes a processor that is effectively connected to the actuator. This typically means that the processor can send commands to the actuator, in particular control commands that cause the actuator to perform a movement and move an element, especially the SEP or an element effectively connected to the SEP. The processor often has an interface for sending control commands to the actuator. The actuator, in turn, has an interface for receiving control commands.

[0013] The control command can contain a predetermined path length, such that when the control command is executed, the actuator is caused to move the SEP by this path length. This means, for example, that the actuator or the element moved by the actuator is in a first position before the control command is executed and is in a second position after the control command is executed. The control command is then designed such that the spatial distance, particularly the vertical distance, between the first and second positions is equal to the path length. Alternatively or additionally, the control command can contain a predetermined position, so that the SEP is in that predetermined position after the control command has been executed.

[0014] The processor is configured to obtain a target height of the SEP from memory or an external data source. The processor may have a suitable interface for this purpose, enabling data retrieval from the memory or external data source. Within the scope of this disclosure, the target height can be the height of a reference point of the SEP above a ground plane or ground level. The SEP may, for example, include an optical element, and the reference point may, for example, lie along an optical axis of the SEP. The optical axis of the SEP may be or include the optical axis of the optical element of the SEP, in particular the optical axis of an object-side optical element of the SEP. The optical element may, for example, be an optical lens. The target height can therefore, in particular, be the minimum vertical distance between the optical axis of the SEP and a ground plane.The ground plane can, for example, be formed by the floor of a workshop or at least partially include the floor of a workshop. The target height can be determined, in particular, based on the height of the headlight to be measured above the ground plane. In most embodiments, the target height is a height of the SEP at which the optical axis of the SEP is the center of the headlight to be measured.

[0015] In this context, a memory can be understood as a data storage device. Generally, a memory can be a device for storing data. The data in the memory can be, for example, in the form of a database. The data can be, for example, in linked form or in pairs. For instance, data relating to a vehicle type can be linked to data relating to a target height, or they can be in pairs or tabular form. The vehicle types and / or target heights can also generally be stored without a link. The memory can have at least one read interface. The read interface can be configured to send data from the memory to another device or to make it available for reading. In most embodiments, the memory is integrated into the device and forms part of the device for adjusting the height of the SEP.

[0016] In this context, an external data source can be understood as a data storage device that has essentially the same properties as the memory but is located separately from the processor. The external data source could be, for example, cloud storage or a physical storage medium. The vehicle itself can also serve as an external data source, for instance, by sending data to the processor. Other end devices, such as smartphones or tablet PCs, or servers that are connected to the processor via wired or wireless connections for data transmission, can also be considered external data sources. When the term "memory" is used below, it can refer to both the memory and / or the external data source.

[0017] In one variant of the device, the target height of the SEP can be the height of a reference point of the SEP, optionally an optical axis of the SEP, above a ground plane or ground level. Furthermore, the processor is configured to generate an initial control command for controlling the actuator based on the obtained target height. The processor can, for example, be configured to convert the target height, which may be specified in meters, into a control command with the characteristics described above. In some embodiments, the processor can also use additional data stored in memory or an external data source. This additional data may include, for example, a reference height, conversion tables, or conversion formulas for calculating different units.

[0018] In some embodiments, the processor can be configured to receive vehicle and / or headlight data and, based on this data, to obtain or determine the target height of the SEP (Single-Elevator Package). This can mean, for example, that the processor receives a vehicle type and determines a target height from memory based on that vehicle type. For this purpose, the processor can, for example, access a table stored in memory in which a vehicle type and / or headlight type is associated with a corresponding target height.

[0019] Alternatively or additionally, the device can further include an input unit for entering vehicle and / or headlight data, wherein the processor is configured to generate the first control command based on the entered vehicle and / or headlight data. The entered vehicle and / or headlight data can, in particular, include a vehicle and / or headlight type, wherein the processor receives or reads the target height based on the entered vehicle and / or headlight type and generates a control command on this basis. The entered data can, for example, include a manually entered target height, which is stored in memory and subsequently used to generate the control command.

[0020] It is also possible to incorporate embodiments in which the device has a stop that limits the vertical displacement of the SEP achievable by the actuator. This displacement can be mechanically limited, for example, by mechanically blocking further movement. Alternatively or additionally, the displacement can be electronically limited, so that, for example, the actuator's movement is stopped when a specific position of the SEP is detected. This can be achieved, for example, by a light barrier. In most embodiments, the height of the stop is fixed and / or known. In some embodiments, the height of the SEP or an optical axis of the SEP when the SEP abuts the stop or is electronically blocked is known. This can be used, for example, for system calibration.

[0021] In these embodiments, the processor can, for example, be configured to generate a control command that moves the SEP towards the stop. The control command can, for example, simply involve moving the SEP towards the stop without specifying a particular distance or length. Alternatively, the control command can, for example, involve moving the SEP a certain distance towards the stop, where the predetermined distance is dimensioned to ensure that the SEP is moved towards the stop.

[0022] Regardless, the position or orientation of the actuator at which the SEP strikes the stop can be defined as a reference position for the actuator. Alternatively or additionally, the position of the SEP when it strikes the stop can be defined as a reference position for the SEP. A reference position for the actuator could, for example, be the actuator's position at the moment of impact or when further actuator movement ceases after impact. The reference position of the SEP could, for example, be the distance of the SEP to a floor plane at the moment of impact.

[0023] In some embodiments, the processor is configured to generate the first control command based on the reference position of the actuator and / or the reference position of the SEP. In some embodiments, the device has a vertical guide configured to guide the SEP vertically. This simplifies the vertical positioning of the SEP. The guide can be formed, for example, by rails. Embodiments are also possible in which the actuator itself has a guide or forms the guide for a SEP.

[0024] Alternatively or additionally, some embodiments of the device may include a relief device designed to relieve the actuator of a portion of the SEP's weight. This relief device may relieve the actuator of more than 50%, or, for example, more than 80%, or particularly more than 90% of the SEP's weight. In some of these embodiments, the relief device may include a counterweight and a transmission mechanism. Relieving the actuator of this load reduces, for example, the requirements for the actuator's lifting force.

[0025] In some embodiments, the device may alternatively or additionally include a position determination means for determining the vertical position of the SEP and / or the position of the actuator. Position here refers in particular to the height of the SEP above a ground plane. The position determination means may determine the position, for example, using sound waves, in particular ultrasonic waves, or electromagnetic waves, in particular light or radio waves. In these embodiments, the processor may be configured to generate the first control command based on the current vertical position of the SEP and / or the position of the actuator and the target height of the SEP. The control command may also be generated, for example, such that the SEP is moved in one direction by the actuator only until the position determination means determines that the SEP has reached the target height.

[0026] According to a further aspect of the present invention, a method for automatically adjusting the height of a headlight aiming test device is proposed. The method comprises the following steps: • Obtaining a target height from a memory or an external database;

[0027] • Generating an initial control command based on the received target height to move the SEP in a vertical direction using an actuator.

[0028] In some embodiments, the method further comprises the following steps:

[0029] • Obtaining vehicle and / or headlight data;

[0030] • Obtaining a target height based on the vehicle and / or headlight type received from the memory or external data source.

[0031] In one variant of the device, the target height can be a target height of the SEP. For example, the target height of the SEP can be the height of a reference point of the SEP, optionally an optical axis of the SEP, above a ground plane or ground level.

[0032] In some embodiments of the method, the first control command is generated based on the target height and a reference position.

[0033] Alternatively or additionally, in some embodiments the method further comprises the following steps:

[0034] • Generating a second control command to move the SEP in a vertical direction such that the SEP and / or the actuator is positioned in the reference position;

[0035] • Moving the SEP by executing the second control command;

[0036] • Stopping the movement of the SEP at the reference position;

[0037] • Setting the current position as the reference position.

[0038] The movement can be stopped by a stop that limits the displacement path of the SEP.

[0039] The first control command and / or the second control command are preferably sent to the actuator via a wired or wireless connection, which then performs the action contained in the control command.

[0040] According to a further aspect of the invention, a computer program is proposed, wherein the computer program contains instructions that cause a control computer to execute the method described above. The control computer can, for example, be implemented by a memory and a processor, wherein the processor can be effectively connected to an actuator.

[0041] Furthermore, a system for measuring vehicle headlights can be provided, wherein the system comprises a SEP and the device in any of the embodiments described above or any combination thereof. The SEP can have a housing with imaging optics and a screen. The imaging optics can, for example, include or consist of a Fresnel lens. In some embodiments of the SEP, the screen can be arranged in the focal plane of the imaging optics. The SEP can be arranged such that the optical axis is horizontal. The SEP is connected to the actuator in such a way that it can be moved by the actuator in the vertical direction.

[0042] Features mentioned in connection with various embodiments of the device, method, computer program, and / or system can be combined. The embodiments mentioned can therefore complement each other or be considered alternatives. Furthermore, when referring to method features, one or more processors may be provided that are configured to execute the method features individually or jointly and / or to cause other devices to perform the method steps.

[0043] The invention will now be explained by way of example with reference to the figures. Identical reference numerals indicate identical or similar features. The invention is not limited to the examples shown in the figures. Features shown in the individual figures can be combined with one another, provided they are not mutually exclusive.

[0044] It shows: Fig. 1 a headlight aiming test device (SEP);

[0045] Fig. 2 shows a SEP positioned in front of a vehicle with headlights;

[0046] Fig. 3 shows a schematic representation of a first embodiment of a device for adjusting the height of a SEP;

[0047] Fig. 4 shows a schematic representation of a second embodiment of a device for adjusting the height of a SEP;

[0048] Fig. 5 shows a schematic representation of a third embodiment of a device for adjusting the height of a SEP.

[0049] Fig. 6 shows a schematic representation of a fourth embodiment of a device for adjusting the height of a SEP.

[0050] Fig. 7 shows a block diagram of a method for the automatic height adjustment of a SEP.

[0051] Figure 1 shows a headlight aiming tester (SEP) 1. The SEP 1 typically comprises a housing with imaging optics and a screen. The imaging optics may, for example, include or consist of a Fresnel lens. The screen may be located in the focal plane of the imaging optics. The optical components of the SEP 1 enable the measurement of light from a headlight 8 of a vehicle 7. Typically, the optical components of the SEP serve to image the light emitted by a headlight 8 of a vehicle 7 onto the screen. An optical axis 12 can be assigned to the SEP 1, which is determined by the optical axis of the object-side optical element. The SEP 1 is typically oriented such that the optical axis 12 of the SEP 1 is horizontal.

[0052] The SEP 1 is mounted so as to be movable in the vertical direction. The SEP 1 shown in Figure 1 is arranged on a vertical guide rail 15. The SEP 1 can also be displaceable in the horizontal direction. For this purpose, the SEP 1 can be mounted on corresponding displacement means 14, as shown in the illustrated embodiment. In the illustrated embodiment, the displacement means 14 are implemented by three rollers that allow the SEP 1 to be displaced in the horizontal direction.

[0053] Figure 2 shows the SEP 1 from Figure 1 positioned in front of a vehicle 7. It is advantageous if the SEP 1 is positioned such that its optical axis 12 intersects the headlight 8 directly, or at least at a distance of less than 5 cm, preferably less than 3 cm. For this purpose, a reliable height adjustment of the SEP 1 is particularly necessary. Figures 1 and 2 show a conventional SEP 1 according to the prior art.

[0054] Figure 3 shows a schematic representation of a device for adjusting the height of a SEP 1, comprising an actuator 2, a processor 3, and a memory 4. The SEP 1 is movable in the vertical direction by means of a functional connection with the actuator 2. The SEP 1 can, for example, be moved by the actuator 2 along a vertical guide rail 15, which is not shown in Figure 3. The actuator 2 is operatively connected to the processor 3 and configured to receive a control command from the processor 3. The actuator 2 executes a movement based on this control command. The processor 3 is configured to generate such a control command. The processor 3 is configured to receive a target height 11, in particular a value of a target height 11, from a memory 4 or an external database 5. Furthermore, the processor 3 is configured to generate the control command based on the target height 11 obtained from the memory 3.

[0055] Furthermore, processor 3 is configured to send the control command to actuator 2. The control command is designed such that actuator 2 moves SEP 1 to the target height 11 when the control command is executed. Figure 3 shows an arrangement in which the control command has already been executed, so that SEP 1 is already at the target height 11. The control command can, for example, contain a direction of movement (up or down) and a distance. Both the distance and the direction of movement can be determined based on the current position of SEP 1 and the target height 11. The distance can, for example, be determined from the magnitude of the difference between the target height 11 and the current position of SEP 1, and the direction of movement can be determined from the sign of that difference.

[0056] The target height can be, as in the example shown in Figure 3, the distance of the optical axis 12 of the SEP 1 to a ground plane 6. Other definitions of the target height are also possible, for example, the distance of a lower edge of the SEP 1 to the ground plane 6.

[0057] Furthermore, the device in the embodiment shown in Figure 3 has an input unit 9. Vehicle and / or headlight data can be entered by a user via the input unit 9. The processor 3 is configured to acquire or receive the entered vehicle and / or headlight data. The processor 3 can also be configured to generate the first control command based on the entered vehicle and / or headlight data. For example, the processor 3 can read or retrieve the target height of the SEP 1 from memory 4 or an external database 5 based on the vehicle and / or headlight data.

[0058] In general, the actuator 2 can be arranged on the housing of the SEP 1 and / or the processor 3, the memory 4, the data source 5 and / or the input unit 9 can each be arranged on or in the housing of the SEP 1. Furthermore, the SEP 1, the actuator 2 and the processor 3 can form a system for checking a headlight setting. Such a system can, for example, include the memory 4, the data source 5 and / or the input unit 9.

[0059] Figure 4 shows a schematic representation of another embodiment of a device for adjusting the height of a SEP 1. In this embodiment, the device has a position determining means 26, which makes it possible to determine the height of the SEP 1, in particular its underside, above a ground plane 6. The position determining means 26 can, for example, be arranged on the underside of the SEP 1. The processor 3 can be configured to generate the control command based on the height of the SEP 1 determined by the position determining means 26 and the target height obtained from the memory 4 or the external database 5. An ultrasonic or laser distance meter, for example, can be used as the position determining means 26.In some embodiments, the control command can also be formulated such that the actuator moves the SEP 1 at least until the position determination means determines that the SEP 1 has a predetermined distance to the ground plane 6, the predetermined distance being determined on the basis of the target height.

[0060] Figure 5 shows another embodiment of the device for adjusting the height of a SEP 1. In contrast to the embodiment of Figure 4, this device has a stop 22 that limits the vertical displacement of the SEP 1. The stop 22 can be a mechanical limit, as shown in Figure 5. Embodiments are also possible in which the stop 22 is electronically formed or triggered, for example, by a light barrier, so that the movement of the actuator is automatically stopped as soon as the light barrier is crossed. The stop 22 can define a reference position of the actuator 2 and / or a reference position of the SEP 1.

[0061] A reference position of actuator 2 can be, for example, the position of actuator 2 at the moment of impact or the position of the actuator when further actuator movement ceases after impact. The reference position of SEP 1 can be, for example, the distance of SEP 1 to a floor plane 6 when SEP 1 impacts the stop 22. The stop 22 can also be used, for example, for calibrating the device.

[0062] Figure 6 shows another aspect of a device for adjusting the height of a SEP 1. The device can include a relief device 23 that relieves the actuator 2 of the weight of the SEP 1. In the illustrated embodiment, the relief device 23 has a counterweight 24 and a transmission mechanism 25. The transmission mechanism 25 can, for example, be implemented in the form of a pulley. The counterweight 24 can, for example, be as heavy as the SEP 1, meaning that the mass of the counterweight differs from the mass of the SEP 1 by less than 50%, for example, less than 20%, or particularly less than 10%. In the present embodiment, the relief device 25 then relieves the actuator 2 of more than 50%, or for example, more than 80%, or particularly more than 90% of the weight of the SEP 1.Other relief mechanisms are also possible, for example, those based on hydraulic support of the actuator. Alternatively or additionally, a drive can be provided that rotates the deflection pulley. In some embodiments, this drive can also take over or at least support the function of the actuator 2 and be configured to receive control commands from the processor 3 and thus move the SEP 1 vertically or support its movement so that the SEP 1 is at the target height.

[0063] Figure 7 shows the process steps of a method for adjusting the height of a SEP 1. The method is specifically designed to be carried out by the devices shown in Figures 3-6. Step S1 comprises obtaining a target height from a storage unit or an external data source. The target height can, for example, be obtained from the storage unit 4 by a processor 3. This could mean, for example, that the processor 3 is configured to read or receive a target height from a storage unit 4. Step S2 comprises generating a first control command based on the obtained target height. The first control command can, for example, be generated by a processor 3. This could mean, for example, that the processor 3 is configured to generate a control command based on the obtained target height.The first control command can be designed such that it causes an actuator 2 to move a SEP 1 vertically until it is at the target height. The processor 3 can, for example, be connected to the actuator 2 in such a way that the control command can be transmitted from the processor 3 to the actuator 2. The actuator 2 can therefore be configured, for example, to receive the control command. The processor 3 can, for example, be configured to send the control command or to initiate the transmission of the control command by a transmitter. Further process steps can therefore also include, for example, sending and receiving the control command. Step S3 finally comprises moving the SEP 1 based on the control command. The actuator 2 is therefore configured to execute the control command.Additionally, procedural steps may be provided that include obtaining vehicle and / or headlight data and subsequently obtaining the target height based on the obtained vehicle and / or headlight type from memory 4 or the external data source.

[0064] Furthermore, in some embodiments of the method, the first control command can be generated based on the target height and a reference position.

[0065] Alternatively or additionally, in some embodiments a second control command is generated to move the SEP 1 vertically such that the SEP 1 and / or the actuator 2 are positioned in the reference position. Subsequently, the SEP 1 can be moved by the actuator 2 in a further process step by executing the second control command, and the movement of the SEP 1 is stopped at the reference position in a further process step. This stopping can be achieved, for example, by a mechanical stop 22 or an electronic stop. The current position can then be defined as the reference position in a further process step.

[0066] The first control command and / or the second control command can be sent to actuator 2 via wired or wireless connection, which then executes the control command.

[0067] Reference symbol list:

[0068] 1 Headlight aiming tester, SEP

[0069] 2 Actuator

[0070] 3 processors

[0071] 4 storage

[0072] 5 Data source

[0073] 6 Ground level

[0074] 7 vehicles

[0075] 8 vehicle headlights

[0076] 9 Input unit

[0077] 11 Height of the SEP 12 Optical axis of the SEP

[0078] 14 Displacement devices

[0079] 15 guide rail

[0080] 22 attacks

[0081] 23 Relief device

[0082] 24 Counterweight

[0083] 25 Transmission mechanism

[0084] 26 Positioning devices

Claims

Patent claims 1. Device for adjusting the height of a headlight aiming test device, SEP (1), comprising • an actuator (2) for moving the SEP (1) in a vertical direction; • a processor (3) effectively connected to the actuator (2) and configured to receive a target height of the SEP (1) from a memory (4) or an external data source (5) and to generate a first control instruction to control the actuator (2) based on the received target height.

2. Device according to the preceding claim, wherein the target height of the SEP (1) is a height of a reference point (12) of the SEP (1) above a ground plane (6) or ground level.

3. Device according to claim 1 or 2, wherein the processor (3) is configured to obtain vehicle and / or headlight data and to obtain or determine the target height of the SEP (1) on the basis of the vehicle and / or headlight data.

4. Device according to one of the preceding claims, further comprising an input unit (9) for entering vehicle and headlight data, wherein the processor (3) is configured to generate the first control command based on the entered vehicle and headlight data.

5. Device according to one of the preceding claims, further comprising a stop (22) that limits a displacement path of the SEP (1) in the vertical direction and defines a reference position of the actuator (2) and / or a reference position of the SEP (1).

6. Device according to one of the preceding claims, wherein the processor (3) is further configured to generate the first control instruction based on the reference position of the actuator (2) and / or the reference position of the SEP (1).

7. Device according to one of the preceding claims, further comprising a vertical guide configured to guide the SEP (1) in a vertical direction.

8. Device according to one of the preceding claims, further comprising a relief device (23) configured to relieve the actuator (2) of part of the weight force of the SEP (1), wherein the relief device (23) preferably comprises a counterweight (24) and a transmission mechanism (25).

9. Device according to one of the preceding claims, wherein the device further comprises a position determining means (26) for determining a vertical position of the SEP (1) and / or a position of the actuator (2).

10. Device according to the preceding claim, wherein the processor (3) is configured to generate the first control instruction based on the vertical position of the SEP (1) and / or the position of the actuator (2) and the target height of the SEP (1).

11. Method for automatic height adjustment of a headlight aiming test device (1), comprising the steps: • Obtaining a target SEP level (1) from a storage unit (4) or an external data source (5); Generating a first control command based on the obtained target height to move the SEP (1) in a vertical direction with an actuator (2).

12. Method according to the preceding claim, wherein the target height of the SEP (1) is a height of a reference point (12) of the SEP (1) above a ground plane (6) or ground level.

13. Method according to claim 11 or 12, further comprising the steps of: • Obtaining vehicle and / or headlight data; • Obtaining a target height based on the vehicle and / or headlight type received from the storage unit (4) or the external data source (5).

14. Method according to one of the preceding claims 11-13, wherein the first control command is generated on the basis of the target height and a reference position.

15. Method according to any one of the preceding claims 11-14, further comprising the steps: • Generating a second control command to move the SEP (1) in a vertical direction such that the SEP (1) and / or the actuator (2) is positioned in the reference position; • Moving the SEP (1) by executing the second control command; • Stopping the movement of the SEP (1) at the reference position; • Setting the current position as the reference position.

16. Method according to the preceding claim, wherein the stopping of the movement is effected by a stop (22) which limits the displacement path of the SEP (1).

17. Computer program, wherein the computer program includes instructions that cause a control computer to execute the method according to any one of claims 11-16.

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