Holding device for electromechanical vehicle brake device, electromechanical disc type vehicle brake device with holding device, and method for operating holding device

Abstract

To provide a holding device 10 for an electromechanical vehicle brake device 12.SOLUTION: A holding device 10 comprises a control device having a control program, and at least one movably-supported plastic holding element 18. This element 18 is designed to fix an electromechanical vehicle brake device 12 connected to the holding device 10 in at least one brake force holding position by means of the control device having the control program. Furthermore, the control device having the control program is designed to change an end position of the plastic holding element 18 relative to the electromechanical vehicle brake 12, which is required for a brake locking process of the electromechanical vehicle brake device 12, so that a constant load state on the plastic holding element 18 based on the brake locking process during an entire service life of the holding device 10 can be avoided.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a retaining device for an electromechanical vehicle braking system. [Background technology]

[0002] A typical electromechanical vehicle braking system for a conventionally driven vehicle with an internal combustion engine or for an electrically driven vehicle typically uses an electric motor with a rotary transmission and a rotation / translation converter to generate the actuation force for the friction brake. In the rotary transmission, the use of plastic gears in the individual transmission stages (e.g., worm wheel stages) is a low-cost solution that offers particularly advantageous NVH (Noise, Vibration, Harshness) characteristics.

[0003] Since the transmission mechanism of an electromechanical vehicle brake system is typically configured as a non-self-locking service brake, an additional mechanism is required to maintain the braking moment continuously during parking.

[0004] A particularly advantageous implementation is an additional element in the transmission or on the electric motor that positively blocks the rotation of these components. For this purpose, for example, switchable freewheels or actuatable pins are known, which block rotation when the parking brake is activated.

[0005] As a rule, these elements are attached to the fastest possible member of the variable speed working chain, for example directly on the motor pinion, since the moments are lowest there, which allows for a particularly compact and cost-effective implementation.

[0006] In a modular electromechanical vehicle braking system, such components may be considered as independent units. The use of plastic components, such as plastic gears, is known to cause creep problems. This can occur, in particular, when the locking mechanism for the parking function is located upstream of the plastic gear stage in the transmission. This results in a strong, static, and constant load being applied to the plastic gear during parking, particularly on one or a few teeth of the gear, which can promote undesirable deformations due to the creep. Summary of the Invention

[0007] The invention provides a holding device for an electromechanical vehicle brake system according to claim 1 and a method for operating the holding device according to claim 10 .

[0008] The present invention further provides an electromechanical disc-type vehicle brake system comprising a retaining device according to any one of claims 1 to 7, and an electromechanical drum-type vehicle brake system comprising a retaining device according to any one of claims 1 to 7.

[0009] Preferred developments are the subject of the dependent claims. [Effects of the Invention]

[0010] The idea behind the present invention is to provide a holding device for an electromechanical vehicle brake system and a method for operating such a holding device, in which components of the holding device that are loaded during the brake locking process of the electromechanical vehicle brake system occupy different end positions during different brake locking processes, so that a constant load state on this component due to the brake locking process over the entire life of the holding device can be avoided. The constant end positions known from prior art locking systems lead to strong, static, and constant loads on the holding elements, which over the entire life of the holding device result in premature material fatigue, so that a frictionless functioning of the brake locking process of the electromechanical vehicle brake system is no longer guaranteed.

[0011] According to the invention, a holding device for an electromechanical vehicle brake system comprises a control device with a control program and at least one movably supported plastic holding element, which is designed to lock the electromechanical vehicle brake system coupled to the holding device in at least one brake force holding position by means of the control device with the control program. Furthermore, the control device with the control program is designed to change the end position of the plastic holding element relative to the electromechanical vehicle brake, which is required for the brake locking process of the electromechanical vehicle brake system, so that a constant load state on the plastic holding element due to the brake locking process over the entire life of the holding device can be avoided.

[0012] The plastic retaining element may have one or more plastic gears.

[0013] The holding device can be used advantageously, for example, in any vehicle having an electromechanical vehicle brake system. In this context, the term "holding device" should be understood to mean a holding force that provides a sufficient parking moment for the electromechanical vehicle brake system, that is, for a secure brake locking process at the time.

[0014] The variable end positions are designed in such a way that a reliable braking process of the electromechanical vehicle brake system is always guaranteed. In other words, the parking process to be initiated by the presented holding device is always such that a sufficient holding force is generated based on the current end position of the plastic holding element to securely lock the vehicle in a parking position. The current required end position is characterized in that a braking moment exceeding the minimum parking brake moment threshold required for a stop is guaranteed for a reliable braking process, and for this purpose the current required holding force can be provided based on the current end position of the plastic holding element. The presented device offers the advantage that a constant load state on the plastic holding element can be avoided based on the resulting different end positions by changing the current required end position. In this way, the same load state on the plastic holding element during the braking process of the electromechanical vehicle brake system can be avoided in an unexpectedly simple manner, thereby providing a highly reliable and longer-lasting mechanism. A constant one end position of the plastic holding element for the purpose of providing sufficient holding force for a secure brake locking process can thereby be avoided.The presented holding device is advantageously designed to provide a multitude of possible required end positions of the plastic holding element, so that one variation from these multitude is possible, so that a constant load state based on a constant end position of the plastic holding element can be avoided.

[0015] According to a preferred embodiment of the holding device, the plastic holding element is configured as a plastic gear or as a worm wheel arrangement. The advantages described above apply equally to this embodiment of the present holding device. The variable end position required at any given time results in a more even distribution of the load over the teeth of the plastic gear, or correspondingly, a more even load on the sub-sections of the worm wheel arrangement, which is relevant for the overall service life of the holding device.

[0016] According to a preferred embodiment of the holding device, the respective end positions determined by the control device with the control program are variable between a first end position with a minimum holding force for the brake locking process of the electromechanical vehicle brake system and a second end position with a maximum holding force for the brake locking process of the electromechanical vehicle brake system.

[0017] In this way, it is ensured that the resulting required end position of the plastic retaining element is always within the interval required for a secure and reliable brake locking process of the electromechanical vehicle brake system.

[0018] Depending on the use of the holding device described, this information is set in a control device with a control program, so that a reliable selection of the required end position from this interval is possible. The current corner value can then also be considered as a target value for the variable required end position. In other words, the first end position or the second end position can also be variably controlled to trigger a reliable brake locking process of the electromechanical vehicle brake system.

[0019] According to a preferred embodiment of the holding device, the end position of the plastic holding element selected by the control device having the control program differs at least from the end position of the plastic holding element used immediately before in time.

[0020] The most recently used end position of the plastic retaining element can then be derived from the last locking process of the electromechanical vehicle brake system triggered by the retaining device and can be stored accordingly by the control device with the control program, thus ensuring that the required end position changes sufficiently over the entire life of the retaining device, thereby avoiding constant load conditions.

[0021] According to a preferred embodiment of the holding device, the control device with the control program is designed to change an already selected end position of the plastic holding element for the current brake locking process of the electromechanical vehicle brake system towards at least one other end position different from the already selected end position according to a settable time parking interval defined by the user.

[0022] This ensures that adverse static load conditions can be avoided even during relatively long brake locking processes of an electromechanical vehicle brake system. The user-defined and settable time parking interval can correspond to, for example, a two-day parking duration, so that a different end position is triggered by the holding device at the latest after two days to avoid the above-mentioned static load on the plastic holding element. The user-defined and settable time parking interval can also be set, for example, so that when parking durations are longer, a periodic adaptation of the required end position is performed. This results in a periodic adjustment of the required end position during longer stopping phases. This makes it possible to imagine changing the required end position at regular intervals when a vehicle equipped with an introducing holding device has a very long stopping time. In other words, this easily prevents adverse static and static loads on the plastic holding element during longer parking stop phases of a vehicle with an introducing mechanism.

[0023] According to a preferred embodiment of the holding device, the control device with the control program is designed to vary the respective end positions using a random method.

[0024] In order to avoid constant load conditions, for example, instead of predetermining and changing the end positions at each time, a random method is used, which makes it possible to simply ensure that sufficiently variable end positions of the plastic holding element occur over the longer overall life of the holding device, so that constant load conditions on the plastic holding element due to the brake fixing process over the overall life of the holding device can be avoided.

[0025] According to a preferred embodiment of the retaining device, the control device comprises at least one actuator device for setting the respective end position of the plastic retaining element relative to the electromechanical vehicle brake.

[0026] In this way, particularly accurate and precise setting of the respective end positions can be ensured, so that a larger number of possible end positions is available for planned variable operating functions. The actuator device can then include any conventional mechanism required for this embodiment, such as a motor. The actuator device can then include a component, such as a parking element, that can prevent the actuator device from rotating without current, for example as a kind of locking pawl or a switchable freewheel. The plastic retaining element is thereby held in the respective end position by the control device and its respective configuration, so that the generated parking brake moment can be maintained even in the de-energized state. The component can then act, for example, on a corresponding pinion or similar of the actuator device for the purposes mentioned.

[0027] To activate the parking brake, for example, a specified current can be applied, and / or a specified motor position can be moved, and / or a specified actuation force can be set (if this is measured by a sensor), and / or a specified braking moment can be set (if this is measured by a sensor). When the brake conditions are the same, i.e., the same wear, temperature conditions, and friction values, any kind of operation control will result in the motor, and therefore the power train position, always being the same when parking. Due to changes in conditions, such as wear over life, the parking position changes only very slowly, so that always occupying the same position would expose the same teeth of the plastic gear to high loads over a relatively long period of time when parking.

[0028] In other words, according to at least one aspect of the present invention, a more even distribution of loads on the teeth of the plastic gear can be achieved by a software function that randomizes the parking position of the motor above the required parking brake moment level, thereby achieving different positions during different parking brake processes. Furthermore, during relatively long stopping phases, the parking brake moment can be adjusted at regular intervals to achieve different positions. This adjustment can be combined, for example, with known functions that are implemented anyway in a stopped vehicle (e.g., hot-reclamp / relax, a driving strategy to prevent release shock).

[0029] Additionally, the invention provides an electromechanical disc vehicle brake system comprising a holding device according to the invention.

[0030] The advantages mentioned above apply equally to the subject matter presented here. It is conceivable that the retaining device is functionally connected to the electromechanical disc vehicle brake system as a separate component. It is also conceivable that the retaining device is already provided in the electromechanical disc vehicle brake system as a functional subcomponent.

[0031] Additionally, the invention provides an electromechanical drum-type vehicle braking system that includes a holding device according to the invention.

[0032] The advantages mentioned above apply equally to the subject matter presented here. It is conceivable that the holding device is functionally connected to the electromechanical drum vehicle brake system as a separate component. It is also conceivable that the holding device is already provided in the electromechanical drum vehicle brake system as a functional subcomponent.

[0033] According to the present invention, a method for operating a holding device according to the present invention includes recognizing a parking brake process of an electromechanical vehicle brake system using the holding device according to the present invention, determining a first end position of a plastic holding element of the holding device with a minimum holding force for the parking brake process of the electromechanical vehicle brake system and a second end position of the plastic holding element of the holding device with a maximum holding force for the parking brake process of the electromechanical vehicle brake system, and selecting a current end position of the plastic holding element using a random method between the first end position and the second end position, wherein the selected current end position of the plastic holding element differs at least from the end position of the plastic holding element used immediately before in time, so that a constant load state on the plastic holding element due to the parking process during the entire life of the holding device can be avoided.

[0034] The method described offers the advantage that the required end position can be changed at any given time, and as a result, a constant load state on the plastic retaining element can be avoided due to the resulting different end positions. In this way, the same load state on the plastic retaining element during the brake locking process of an electromechanical vehicle brake system can be avoided in an unexpectedly simple manner, thereby providing a highly reliable and longer-lasting mechanism.

[0035] According to a preferred embodiment of the method, the time course of the latest brake locking process of the electromechanical vehicle brake system is recorded, and the latest end position of the plastic retaining element is changed towards a new end position of the plastic retaining element that differs from the previous latest end position of the plastic retaining element according to a time parking interval that can be set and defined by the user, so that an unchanging load state on the plastic retaining element due to the latest brake locking process of the electromechanical vehicle brake system can be avoided.

[0036] The time progression of the current brake locking process of the electromechanical vehicle brake system begins when the required holding force is generated based on the current end position of the plastic retaining element, so that a sufficient parking moment can be provided for a reliable brake locking process of the electromechanical vehicle brake system. The settable time interval can be selected, for example, so that the selected current end position is not maintained for such a long time that a constant load on the plastic retaining element would cause damage to the material due to creep processes. The user-defined, settable time parking interval can also be set, for example, so that the required end position is periodically adapted when the parking duration is longer. When the stopping phase is longer, the required end position is periodically adjusted. This makes it possible to change the required end position at regular intervals when the stopping time of a vehicle equipped with the indicated holding device is very long.

[0037] In other words, this makes it possible to easily avoid the occurrence of unfavorable static and permanent loads on the plastic holding element during longer parking stop phases of the vehicle to which the presented method is applied.

[0038] According to another preferred embodiment of the method, the time course of the latest brake locking process of the electromechanical vehicle brake system is recorded, time-dependent material characteristic values ​​for the plastic material of the plastic retaining element are provided, and the latest end position of the plastic retaining element is changed towards a new end position of the plastic retaining element that differs from the immediately previous latest end position of the plastic retaining element depending on the evaluation of the time-dependent material characteristic values, so that an unchanging load state on the plastic retaining element due to the latest brake locking process of the electromechanical vehicle brake system can be avoided.

[0039] The time course of the current locking process of the electromechanical vehicle brake system begins when the required holding force is generated based on the current end position of the plastic retaining element, so that a sufficient parking moment can be provided for a reliable locking process of the electromechanical vehicle brake system. The evaluation of the time-dependent material characteristic values ​​includes, for example, a model-based prediction of the creep behavior of the plastic material of the plastic retaining element. For example, if the time course of the current locking process of the electromechanical vehicle brake system reaches a point in time at which damage to the plastic retaining element due to creep behavior is predicted or at least predicted with sufficient probability based on the evaluation of the time-dependent material characteristic values, according to this preferred embodiment of the method, a change toward a new end position that differs from the current end position is triggered, so that a constant load state on the plastic retaining element due to the current locking process of the electromechanical vehicle brake system can be avoided.

[0040] That is, the vehicle can be stopped and held by the service brake actuator. For this purpose, the driver's "parking" request can be recognized. The desired parking brake level (required parking brake level MP,req) is calculated and MP = MP,req + MP,rand (random component) is set at time 1. Here, MP,rand is randomly selected between the minimum MP,req and the maximum value for parking MP,max. This allows the moment, and therefore the highly loaded teeth of the plastic car, to be changed for each parking process. The moment MP is then held until time 2 by activating the lock on the motor pinion.

[0041] Optionally, at time 2, the calculated new moment can then be transferred, and this new moment is then held, for example, until time 3. This step can be performed when the stopping phase is relatively long and may be repeated periodically. The selection of time 2 may be performed by a model-based prediction of the creep behavior of plastics. Changing the parking brake level may require active release of the parking pawl and energization of the service brake actuator system. This step may in any case be performed in conjunction with another operational control strategy that requires "waking up" the vehicle and applying the service brakes. An example for this is the known retightening of disc brakes when parking to compensate for the weakening braking moment due to cooling ("hot reclamp").

[0042] It is also conceivable that several preferred embodiments of the method can be applied and implemented in combination with each other.

[0043] The retention device may be characterized by the features and advantages listed in connection with the method, and vice versa.

[0044] Further features and advantages of embodiments of the present invention can be seen from the following description of the accompanying drawings.

[0045] The invention will be explained in more detail below on the basis of exemplary embodiments shown in the schematic drawings in the drawing. [Brief explanation of the drawings]

[0046] [Figure 1] 1 is a schematic view of a holding device provided in an electromechanical vehicle brake system; [Figure 2] 1 shows an electromechanical disc vehicle brake system with a retention device according to the invention; [Figure 3] 1 shows an electromechanical drum-type vehicle brake system with a holding device according to the invention; [Figure 4] 2 is a block diagram of method steps of a method for operating a holding device according to one embodiment of the present invention; DETAILED DESCRIPTION OF THE INVENTION

[0047] In the drawings, like reference numerals refer to like or functionally identical elements.

[0048] 1 shows a schematic diagram of a holding device 10 on an electromechanical vehicle braking system 12, shown here as an electromechanically actuated drum brake. The combination may be collectively referred to as a powertrain assembly with a parking brake mechanism.

[0049] The holding device 10 is shown together with a control device having a control program and an actuator device 16. Additionally, the holding device 10 is shown together with a plastic holding element 18 in the form of a worm wheel device. For example, such a worm wheel device has at least one plastic worm wheel. The plastic holding element 18 is mounted on the actuator device 16 and is shown in one of its possible end positions relative to the electromechanical vehicle brake 12, which are required for the brake locking process of the electromechanical vehicle brake device 12.

[0050] When energized, the actuator device 16 as a motor generates a rotary motion, which can be varied in speed by a transmission (e.g., two stages: a worm wheel stage (made of plastic) and a cylindrical gear stage), and can generate a force on the brake jaws by an optional rotation-translation converter. After the brake is applied, the parking element 14 can be activated, for example, by a second, small actuator. For example, the parking element 14 can be a pin, which is actuated by a coil, so that the motor shaft (in its previously moved state) can be blocked by the pin, for example, by blocking a ratchet wheel mounted on this shaft. The motor 16 can then be de-energized, since this position is maintained by the parking element. The parking element itself can be configured to remain in the activated position even when the small parking actuator is de-energized. This can be achieved, for example, by friction between the pin and the ratchet wheel or by a bistable spring.

[0051] This arrangement means that all the moments required for parking must be maintained permanently via the plastic transmission elements (worm wheel stages). To avoid or reduce creep at this point, a corresponding driving strategy is proposed.

[0052] For example, a locking pawl or a switchable freewheel may be provided, in which case these elements may also be called parking elements. Active release of this component then leads to the release of the plastic retaining element for the provided variant. In any case, the control device must be designed in such a way that the required moment for the parking process can be maintained by the control device either directly in connection with the plastic retaining element or in connection with the actuator device and the parking element.

[0053] Additionally, the plastic retaining element 18 can retain the generated parking brake moment. This is shown in FIG. 1 in a highly simplified manner by the connection with the cylindrical gear stage 20 of the electromechanical vehicle brake system 12. In the case of parking, the application force F required for parking must be permanently applied to the brake jaws in the brake drum 22 of the electromechanical vehicle brake system 12. This generates a moment that must be retained, inter alia, also or exclusively by the plastic retaining element 18. Within the toothing, this force is typically transmitted only by a small portion of the teeth. This results in high static loads on the plastic teeth if the end positions are not changed at the time, which can lead to creep over the long term.

[0054] While the function of the electromechanical vehicle brake system 12 for the brake locking process remains constant and sufficient, the ability to change the required end position of the plastic retaining element 18 makes it possible to avoid a constant load state. For example, the presented retaining device 10 allows the braking moment during a single parking process of a vehicle equipped with the retaining device 10 to randomly vary above the threshold parking brake moment required for a minimum stop. The different required end positions of the plastic retaining element 18 at each time may also be referred to as the current parking brake level. Changing the current parking brake level may require active release of the plastic retaining element and simultaneous energization of the service brake actuator system of the electromechanical vehicle brake system 12.

[0055] FIG. 2 shows an electromechanical disc vehicle braking system 24 equipped with a retaining device 10 according to the invention.

[0056] FIG. 3 shows an electromechanical drum-type vehicle braking system 26 equipped with a holding device 10 according to the invention.

[0057] FIG. 4 shows a block diagram of method steps of a method for operating a holding device according to one embodiment of the invention.

[0058] A method for operating a holding device according to the present invention as claimed in any one of claims 1 to 7, comprising: recognizing a parking brake process of an electromechanical vehicle brake system by means of the holding device according to the present invention (S1); determining a first end position of a plastic holding element of the holding device with a minimum holding force for the parking brake process of the electromechanical vehicle brake system and a second end position of the plastic holding element of the holding device with a maximum holding force for the parking brake process of the electromechanical vehicle brake system (S2); selecting a current end position of the plastic holding element using a random method between the first and second end positions (S3), wherein the selected current end position of the plastic holding element differs at least from the end position of the plastic holding element used immediately before in time, so that a constant load state on the plastic holding element due to the parking process during the entire life of the holding device can be avoided.

[0059] The presented method may be implemented at least partially or even entirely together with further operational control strategies that require a so-called wake-up of the vehicle and a corresponding method for the service brake. An example of this is the well-known so-called re-tightening of disc brakes during the parking process, in order to compensate for the weakening braking moment caused by the cooling process, also known as "hot reclamp." In the context of drum brakes, the so-called "hot-relax" function may also be mentioned. It may also be planned to combine, at least partially or even entirely, a method for scheduling the periodic release of the parking brake to avoid release shocks in drum brakes.

[0060] Although the present invention has been fully described above with reference to preferred embodiments, the present invention is not limited to the preferred embodiments and can be modified in various forms and styles. [Explanation of symbols]

[0061] 10 Holding device 12 Electromechanical vehicle braking systems 14 Parking Elements 16 Actuator device 18 Plastic Retaining Elements 20 Cylindrical gear stages 22 Brake drum 24 Electromechanical disc-type vehicle brake system 26 Electromechanical drum-type vehicle braking system F Actuation force S1 Method Step S2 Method Step S3 Method Steps

Claims

1. A retaining device (10) for an electromechanical vehicle braking system (12), comprising: a control device having a control program and at least one movably supported plastic holding element (18), the plastic holding element (18) being designed to fix an electromechanical vehicle brake device (12) coupled to the holding device (10) in at least one brake force holding position by means of the control device having the control program, the control device having the control program being designed to change an end position of the plastic holding element (18) relative to the electromechanical vehicle brake (12) required for a brake fixing process of the electromechanical vehicle brake device (12), so that a constant load state on the plastic holding element (18) due to the brake fixing process during the entire life of the holding device can be avoided. A retaining device (10) for an electromechanical vehicle braking system (12).

2. 2. The holding device (10) according to claim 1, wherein the plastic holding element (18) is formed as a plastic gear or as a worm wheel arrangement.

3. 3. The holding device (10) of claim 1 or 2, wherein the end position determined at each time by a control device having the control program is variable between a first end position with a minimum holding force for the brake locking process of the electromechanical vehicle brake device (12) and a second end position with a maximum holding force for the brake locking process of the electromechanical vehicle brake device (12).

4. A holding device (10) as claimed in any one of claims 1 to 3, wherein the end position of the plastic holding element (18) selected by a control device having the control program is at least different from the end position of the plastic holding element (18) used immediately before in time.

5. 5. The holding device (10) according to claim 1, wherein the control device with the control program is designed to change a previously selected end position of the plastic holding element (18) for a current brake locking process of the electromechanical vehicle brake device (12) towards at least one other end position different from the previously selected end position according to a settable time parking interval defined by the user.

6. 6. A holding device (10) according to any one of claims 1 to 5, wherein the control device with the control program is designed to vary the end positions at each time using a random method.

7. 7. The retaining device (10) according to any one of claims 1 to 6, wherein the control device has at least one actuator device (16) for setting the respective end positions of the plastic retaining element (18) relative to the electromechanical vehicle brake (12).

8. 8. An electromechanical disc-type vehicle brake system (24) comprising a retaining device (10) according to any one of claims 1 to 7.

9. 8. An electromechanical drum-type vehicle brake system (26) comprising a retaining device (10) according to any one of claims 1 to 7.

10. A method for operating a holding device (10) according to any one of claims 1 to 7, comprising the steps of: - a step (S1) of recognizing a parking brake process of an electromechanical vehicle brake system (12) by means of a holding device (10) according to any one of claims 1 to 7; determining (S2) a first end position of the plastic holding element (18) of the holding device (10) with a minimum holding force for a brake locking process of the electromechanical vehicle brake device (12) and a second end position of the plastic holding element (18) of the holding device (10) with a maximum holding force for the brake locking process of the electromechanical vehicle brake device (12); a step (S3) of randomly selecting a latest end position of the plastic holding element (18) between the first end position and the second end position, wherein the selected latest end position of the plastic holding element (18) differs at least from the end position of the plastic holding element (18) used immediately before in time, so that a constant load state on the plastic holding element (18) due to the fastening process during the total life of the holding device (10) can be avoided; Including, A method of operating a holding device (10).

11. - recording the time course of the latest brake locking process of the electromechanical vehicle brake system (12); changing the latest end position of the plastic holding element (18) according to a user-defined, settable time parking interval towards a new end position of the plastic holding element (18) that differs from the previous latest end position of the plastic holding element (18), so that a constant load state on the plastic holding element (18) due to a latest brake locking process of the electromechanical vehicle brake device (12) can be avoided; Including, A method for operating a holding device (10) according to claim 10.

12. - recording the time course of the latest brake locking process of the electromechanical vehicle brake system (12); providing a time-dependent material characteristic value for the plastic material of the plastic holding element (18); changing the latest end position of the plastic holding element (18) in response to the evaluation of the time-dependent material characteristic value towards a new end position of the plastic holding element (18) that differs from the previous latest end position of the plastic holding element (18), so that a constant load state on the plastic holding element (18) due to a latest brake locking process of the electromechanical vehicle brake system (12) is avoided; Including, A method for operating a holding device (10) according to claim 10.

Images