Brake actuation sensor device for a vehicle braking system and method for mounting a brake actuation sensor device on a vehicle braking system

Abstract

Brake booster housing assembly (20) for a vehicle brake system, which can be attached to a vehicle wall component (30) by means of a fastening component (36), comprising a brake actuation sensor device with: a strain and / or compression measuring device (24) which is configured such that the strain and / or compression measuring device (24) can be reversibly varied in its extent along at least one predetermined spatial direction (26), whereby at least one electrical property of the strain and / or compression measuring device (24) can be changed; and an evaluation device (28) by means of which at least one electrical quantity can be determined with respect to the electrical property which can be changed by varying the extension of the strain and / or compression measuring device (24) along the at least one predetermined spatial direction (26) and which, taking into account the at least one determined electrical quantity, can be determined with respect to a brake actuation force exerted on a brake actuation element (12) of the brake system; characterized by the fact that the strain and / or compression measuring device (24) is additionally designed such that the strain and / or compression measuring device (24) can be arranged in direct or indirect contact with a brake booster housing device (20) such that a force exerted on the brake booster housing device (20) by actuating the brake actuating element (12) causes a mechanical stress (σ) in the strain and / or compression measuring device (24) and the strain and / or compression measuring device (24) does not or does not perform any relative movement with respect to a vehicle wall component (30) when the brake actuating element (12) is actuated.

Description

[0001] The invention relates to a brake booster housing assembly for a vehicle's braking system, comprising a brake actuation sensor device, a brake booster, an intermediate piece for attaching a brake booster housing assembly to a vehicle wall component, and a vehicle's braking system. The invention further relates to a method for mounting a brake actuation sensor device on a vehicle's braking system. State of the art

[0002] German patent DE 197 41 366 C1 describes a brake pedal assembly comprising a brake pedal that is adjustable by means of a driver's braking force and can be adjusted via a spring to a vehicle wall component. A pushrod can be connected to the brake pedal via a pivot joint, allowing the pushrod to be adjusted relative to the vehicle wall component by means of the driver's braking force applied to the brake pedal. The pedal force applied to the brake pedal is to be detected by means of a force sensor, for example, a strain gauge. For this purpose, the force sensor is arranged either on the brake pedal itself or on the pushrod.

[0003] DE 43 09 850 A1 discloses a brake booster in which a brake actuation sensor device is connected to an actuating rod.

[0004] In DE 38 03 958 A1 a brake booster is disclosed which is attached to an intermediate wall of the vehicle by means of an adapter.

[0005] In JP S57-48626A a screw with an integrated strain gauge is disclosed. Disclosure of the invention

[0006] One of the problems underlying the invention is to provide more robust solutions for detecting brake actuation force.

[0007] This problem is solved according to the invention by a brake booster housing assembly with the features of claim 1, a brake booster with the features of claim 7, an intermediate piece for attaching a brake booster housing assembly to a vehicle wall component with the features of claim 8, a brake system for a vehicle with the features of claim 9 and a method for mounting a brake actuation sensor device on a brake system of a vehicle with the features of claim 10. Advantages of the invention

[0008] The present invention enables an arrangement of the strain and / or compression measuring device in which the strain and / or compression measuring device (despite the continued transmission of mechanical stress to it during actuation of the brake actuator) exhibits virtually no relative movement with respect to an (adjacent) vehicle wall component. Thus, the present invention eliminates the need to design the strain and / or compression measuring device and / or an electrical connection between the strain and / or compression measuring device and vehicle-mounted electronics for the conventional relative movement of the strain and / or compression measuring device during actuation of the brake actuator.The strain and / or compression measuring device, its electrical contacts, and / or any associated evaluation unit / electronics can thus be designed more cost-effectively. Furthermore, the elimination of relative movement results in improved robustness of the strain and / or compression measuring device and a reduced risk of damage during brake application. This advantageous arrangement of the strain and / or compression measuring device also leads to a longer service life and / or extended usability.

[0009] The advantageous arrangement of the strain and / or compression measuring device also facilitates its installation on a vehicle's braking system. At the same time, positioning the strain and / or compression measuring device at a distance from the brake actuation element, such as a brake pedal, ensures that it is not accidentally damaged by pressure exerted on it by the driver during actuation of the brake actuation element.

[0010] For example, the strain and / or compression measuring device can include at least one strain gauge. The strain and / or compression measuring device can therefore be designed cost-effectively.

[0011] In an advantageous embodiment, the strain and / or compression measuring device is at least partially arranged or can be arranged directly on and / or in the brake booster housing assembly. Likewise, the strain and / or compression measuring device can be at least partially arranged or can be arranged directly on and / or in an intermediate piece that can be inserted between the brake booster housing assembly and a vehicle wall component to which the brake booster housing assembly can be attached by means of at least one fastening component. Alternatively or additionally, the strain and / or compression measuring device can be at least partially arranged or can be arranged directly on and / or in a fastening component by means of which the brake booster housing assembly can be attached to the vehicle wall component.All the arrangement options for the strain and / or compression measuring device described here guarantee the advantages described above.

[0012] In particular, the strain and / or compression measuring device can be arranged, at least partially, directly on and / or in a smart screw as the fastening component. Thus, a cost-effective component can be used to implement the present invention.

[0013] The advantages of the invention described above can also be achieved by means of the brake booster housing assembly, the brake booster, the intermediate piece for attaching a brake booster housing assembly to a vehicle wall component, the fastening component, the brake system for a vehicle and by means of the method for mounting a brake actuation sensor device on a brake system of a vehicle. Brief description of the drawings

[0014] Further features and advantages of the present invention are explained below with reference to the figures.

[0015] They show: Fig. 1a and Fig. 1b a schematic partial representation of a first braking system and a coordinate system to explain a first embodiment of the brake actuation sensor device; Fig. 2a and Fig. 2b a schematic partial representation of a second braking system and a coordinate system to explain a second embodiment of the brake actuation sensor device; Fig. 3a and Fig. 3b a schematic partial representation of a third braking system and a coordinate system to illustrate a third embodiment of the brake actuation sensor device; and Fig. 4 a flowchart to illustrate an embodiment of the method for mounting a brake actuation sensor device on a braking system of a vehicle. Embodiments of the invention

[0016] Fig. 1a and Fig. Figure 1b shows a schematic partial representation of a first braking system and a coordinate system to explain a first embodiment of the brake actuation sensor device.

[0017] The in Fig. Figure 1a, partially schematically represented, has, in addition to a master brake cylinder 10 and a brake actuating element 12, a brake booster 14. By means of the brake booster 14, in addition to the driver braking force Ff applied to the brake actuating element 12, an additional (not shown) boosting force can be exerted on at least one adjustable piston of the master brake cylinder 10 during actuation of the brake actuating element 12 by the driver. In this way, the driver can be given forceful assistance while braking the vehicle. The in Fig. The brake booster 14 shown in Figure 1a is designed as an electromechanical brake booster 14 with an electric motor 16 and a brake booster gearbox 18. However, it should be noted that the applicability of the brake actuation sensor device described below is not limited to a brake system equipped with an electromechanical brake booster 14. Instead of the brake booster gearbox 18, another subunit of a brake booster 14 can also be arranged (at least partially) in a brake booster housing 20. The design of the brake booster 14 as an electromechanical brake booster 14 is to be interpreted merely as an example. Likewise, the first brake system can also have a different type of actuation element instead of a brake pedal 12.Furthermore, the connection of the master brake cylinder 10 to a brake fluid reservoir 22 is only optional.

[0018] The first braking system is equipped with a brake actuation sensor device comprising a strain and / or compression measuring device 24. The strain and / or compression measuring device 24 is designed such that its extension can be reversibly varied along at least one predetermined spatial direction 26, thereby changing at least one electrical property of the strain and / or compression measuring device 24. The electrical property that can be changed by varying the extension of the strain and / or compression measuring device 24 along the at least one predetermined spatial direction 26 can, for example, be a voltage, a resistance, and / or a current. The strain and / or compression measuring device 24 can, for example, be designed to utilize the piezoelectric effect or the piezoresistive effect.In particular, the strain and / or compression measuring device 24 can be configured as a piezoelectric sensor element and / or a piezoresistive sensor element. However, the strain and / or compression measuring device 24 is not limited to such a configuration.

[0019] In an advantageous embodiment, the strain and / or compression measuring device 24 comprises at least one strain gauge. It should be noted that a variety of known strain gauge designs can be used for the strain and / or compression measuring device 24. The strain and / or compression measuring device 24 can therefore be manufactured cost-effectively. It should also be noted that the design of the strain and / or compression measuring device 24 is not limited to the use of a single strain gauge.

[0020] The brake actuation sensor device also includes an evaluation unit 28, by means of which at least one electrical quantity relating to the electrical property that can be changed by varying the extension of the strain and / or compression measuring device 24 along at least one predetermined spatial direction 26 can be determined. Furthermore, by means of the evaluation unit 28, taking into account the at least one determined electrical quantity, an evaluation quantity relating to a braking force exerted on the brake actuation element 12 of the first brake system can be determined. For example, the driver's braking force Ff and / or a brake pressure can be determined as an evaluation quantity by means of the evaluation unit 28. However, the configuration of the evaluation unit 28 is not limited to determining the quantities mentioned here as evaluation quantities.

[0021] Furthermore, the strain and / or compression measuring device 24 is additionally designed such that it can be arranged in direct or indirect contact with a brake booster housing 20 in such a way that a force exerted on the brake booster housing 20 causes a mechanical stress in the strain and / or compression measuring device 24. For example, the strain and / or compression measuring device 24 can be arranged in (direct) contact with the brake booster housing 20 in such a way that a compressive / tensile force exerted on the brake booster housing 20 (when the brake actuating element 12 is actuated) can be at least partially transmitted to the strain and / or compression measuring device 24.Thus, a mechanical stress exerted on the brake booster housing assembly 20 during actuation of the brake actuation element 12 is at least partially transferred to the strain and / or compression measuring device 24 and causes a variation in the extension of the strain and / or compression measuring device 24 along at least one predetermined spatial direction 26. Likewise, the strain and / or compression measuring device 24 can be arranged / is arranged via at least one intermediate component in (indirect) contact with the brake booster housing assembly 20 such that the compressive / tensile force exerted on the brake booster housing assembly 20 causes a compressive / tensile force in the at least one intermediate component, which is subsequently transferred as mechanical stress / compressive stress / tensile stress to the strain and / or compression measuring device 24.This can also trigger a detectable variation in the extension of the strain and / or compression measuring device 24. This changes at least one electrical property of the strain and / or compression measuring device 24, which can be detected by the evaluation device 28 during operation of the brake actuation sensor device.

[0022] It is pointed out that the arrangement of the strain and / or compression measuring device 24 in direct or indirect contact with the brake booster housing device 20 is preferably to be interpreted such that not only does the mechanical stress in the strain and / or compression measuring device 24 occur simultaneously with the force exerted on the brake booster housing device 20, but the mechanical stress in the strain and / or compression measuring device 24 can be induced / triggered by means of the force exerted on the brake booster housing device 20.

[0023] The evaluation unit 28 can output information indicating whether a driver braking force Ff / a non-zero brake actuation force is exerted on the brake actuation element 12. Furthermore, the evaluation unit 28 can also define a brake actuation force parameter, such as the driver braking force Ff, a brake actuation distance, and / or a brake pressure, as an evaluation parameter with high accuracy and a low probability of error.

[0024] The brake actuation sensor device described in the preceding paragraphs has the advantage that the strain and / or compression measuring device 24 is arranged during operation such that, when the brake actuation element 12 is actuated by the driver, the strain and / or compression measuring device 24 undergoes (virtually) no relative movement, for example, with respect to a vehicle wall component 30 to which the brake booster housing assembly 20 is attached / fastened. In contrast to a measuring element arranged on a brake actuation element 12 or a push rod 32, the strain and / or compression measuring device 24 thus does not change its position / position during actuation of the brake actuation element 12, or hardly at all.This eliminates the need to design the strain and / or compression measuring device 24 and / or an electrical connection 34 between the strain and / or compression measuring device 24 and the evaluation unit 28 for the conventional relative movement of the strain and / or compression measuring device 24 during actuation of the brake actuation element 12. The brake actuation sensor device can therefore have the technical feature that the electrical connection 34 is designed for exclusively static use of the strain and / or compression measuring device 24. The electrical connection 34 of the strain and / or compression measuring device 24 to the evaluation unit 28, designed, for example, as a connecting cable, is thus preferably not designed to compensate for the conventional relative movement.

[0025] Due to the advantageous design / arrangement of the strain and / or compression measuring device 24, the brake actuation sensor device exhibits a lower susceptibility to faults. This advantageous design / arrangement also ensures a longer service life and / or a lower failure rate for the strain and / or compression measuring device 24. Furthermore, the electrical connection 34 can be implemented relatively cost-effectively.

[0026] It should be noted that the evaluation unit 28 can be used independently of its physical location. Therefore, the evaluation unit 28 can be installed in a fixed location. In particular, the evaluation unit 28 can be integrated into the central control electronics of the braking system and / or the vehicle equipped with the braking system.

[0027] At the in Fig. In the first brake system, shown schematically in Figure 1a, the strain and / or compression measuring device 24 is (at least partially) arranged directly on and / or in the brake booster housing assembly 20. Preferably, the position of the strain and / or compression measuring device 24 is located on and / or in a region of the brake booster housing assembly 20 which experiences mechanical stress caused by the driver's braking force Ff when the brake actuation element 12 is actuated. Furthermore, a position of the respective region upstream of the application of the booster force / servo force of the motor 16 of the brake booster 14 is preferred. This prevents the booster force / servo force from causing additional mechanical stresses within the strain and / or compression measuring device 24, which could potentially affect the evaluation parameter that can be determined by the evaluation unit 28.The preferred position of the strain and / or compression measuring device 24 on and / or in the brake booster housing assembly 20 can also be described such that the strain and / or compression measuring device 24 is formed on and / or in a sub-area of ​​the brake booster housing assembly 20, which lies in a space between a transmission shaft of the brake booster 14 and the brake actuation element 12.

[0028] Fig. Figure 1a also shows a brake booster housing assembly 20 with a strain and / or compression measuring device 24, which is designed such that the strain and / or compression measuring device 24 can be reversibly varied in its extent along at least one predetermined spatial direction 26, thereby changing at least one electrical property of the strain and / or compression measuring device 24, and which is arranged directly on and / or in the brake booster housing assembly 20. A brake booster equipped with the advantageous brake booster housing assembly 20 can also be controlled by means of the Fig. 1a reproduced.

[0029] Fig. Figure 1b shows a coordinate system to illustrate the operation of the strain and / or compression measuring device 24 described above. The abscissa of the coordinate system is the time axis t. The ordinate of the coordinate system is Fig. 1b specifies a tensile stress σ transmitted from the brake booster housing assembly 20 to the strain and / or compression measuring device 24 as a mechanical stress.

[0030] Before the brake is applied at time t0, no tensile force is exerted on the strain and / or compression measuring device 24. Therefore, before time t0, (almost) no tensile stress occurs in the strain and / or compression measuring device 24.

[0031] From time t0, the driver activates the brake actuator 12. Due to the brake booster housing 20 being attached to a vehicle wall component 30, such as a firewall, by means of at least one fastening component 36, it is reliably ensured that the brake booster housing 20 remains in its desired position despite the driver's braking force Ff. However, the non-zero driver braking force Ff exerted on the brake actuator 12 causes a tensile stress / force as a mechanical stress in the brake booster housing 20, which is at least partially transferable to the strain and / or compression measuring device 24. Thus, a tensile stress σ with a value σx non-zero occurs in the strain and / or compression measuring device 24 from time t0. This non-zero tensile stress σx can be interpreted as the driver's braking request.Depending on the intensity and orientation of the occurring tensile stress σ, it is possible not only to detect whether the driver is braking, but also with what intensity / driver braking force Ff the actuation of the brake actuation element 12 is carried out.

[0032] Fig. 2a and Fig. Figure 2b shows a schematic partial representation of a second braking system and a coordinate system to explain a second embodiment of the brake actuation sensor device.

[0033] At the in Fig. In the second brake system, shown partially schematically in Figure 2a, the strain and / or compression measuring device 24 is (at least partially) arranged directly on and / or in an intermediate piece 50, which can be inserted between the brake booster housing assembly 20 and the vehicle wall component 30, to which the brake booster housing assembly 20 can be attached by means of at least one fastening component 36. The intermediate piece 50 can, for example, be a spacer and / or a standoff. It should be noted that the design of the intermediate piece 50 is not limited to a specific type of intermediate piece.

[0034] Fig. Figure 2a also shows an intermediate piece 50 for attaching a brake booster housing assembly 20 to a vehicle wall component 30, such as a vehicle firewall, with a strain and / or compression measuring device 24. The strain and / or compression measuring device 24 is designed such that its extension can be reversibly varied along at least one predetermined spatial direction 26, thereby changing at least one electrical property of the strain and / or compression measuring device 24. Furthermore, the strain and / or compression measuring device 24 is / can be arranged directly on and / or in the intermediate piece 50 such that the intermediate piece 50 can be inserted between the brake booster housing assembly 20 and the vehicle wall component 30.For example, at least one screw can be used as a fastening component 36 to attach the brake booster housing assembly 20 to the vehicle wall component 30.

[0035] The coordinate system of Fig. Figure 2b describes the operation of the advantageously arranged strain and / or compression measuring device 24. The abscissa of the coordinate system is the time axis t. The ordinate of the coordinate system is Fig. 2b specifies a compressive stress σ occurring in the strain and / or compression measuring device 24 as a mechanical stress.

[0036] By pre-tensioning the intermediate piece 50 with a corresponding force during the installation of the brake booster 14, a compressive stress can be induced in the intermediate piece 50. Thus, even before the time t0 from which the driver actuates the brake actuating element 12, an initial compressive stress σ0 (non-zero) is transferred / exerted as a compressive stress σ (mechanical stress) onto the strain and / or compression measuring device 24.

[0037] From time t0, the driver actuates the brake actuation element 12. The actuation of the brake actuation element 12 causes a reduction in the compressive stress σ in the strain and / or compression measuring device 24. The evaluation device 28 can detect this reduction in the compressive stress σ below the initial compressive stress σ0 and use it to redefine the evaluation parameter.

[0038] Even in the Fig. The advantageous arrangement of the strain and / or compression measuring device 24 shown in Figure 2a ensures reliable detection of brake application by the driver. It should be noted that even with this advantageous arrangement of the strain and / or compression measuring device 24, (virtually) no relative movement of the strain and / or compression measuring device 24 occurs during actuation of the brake actuation element 12. The advantages mentioned above are therefore still guaranteed with this advantageous arrangement of the strain and / or compression measuring device 24.

[0039] Fig. 3a and Fig. Figure 3b shows a schematic partial representation of a third braking system and a coordinate system to explain a third design form of the brake actuation sensor device.

[0040] At the in Fig. In the schematically depicted brake actuation sensor device 3a, the strain and / or compression measuring device 24 is at least partially arranged / arrangable directly on and / or in at least one fastening component 36, by means of which the brake booster housing assembly 20 can be fastened to a vehicle component 30. The at least one fastening component 36 can, for example, be a screw. In particular, the strain and / or compression measuring device 24 can be at least partially arranged / arranged directly on and / or in an intelligent screw as the fastening component. Likewise, an intelligent screw can be used as the strain and / or compression measuring device 24. The intelligent screw can, for example, be an i-Bolt. Thus, a component that is already commonly and cost-effectively manufactured can be used as the strain and / or compression measuring device 24.

[0041] Fig. 3a also represents a fastening component 36, which includes a strain and / or compression measuring device 24. The strain and / or compression measuring device 24 is designed such that its extension can be reversibly varied along at least one predetermined spatial direction 36. This allows at least one electrical property of the strain and / or compression measuring device 24 to be changed. The strain and / or compression measuring device is / can be arranged directly on and / or in the fastening component 36 such that a brake booster housing assembly 20 can be fastened to a vehicle wall component 30 by means of the fastening component 36. In particular, the fastening component 36, for example an intelligent screw, can also be used as the strain and / or compression measuring device 24 in this case.

[0042] The advantageous functioning of the strain and / or compression measuring device 24 arranged on or in the fastening component is described by means of the coordinate system of the Fig. 3b is reproduced. For further explanation of this function, reference is made to the Fig. 1b referred.

[0043] The braking systems described in the preceding paragraphs represent advantageous configurations of a braking system according to the technology of the invention. However, the configuration of such a braking system is not limited to the components depicted in the braking systems.

[0044] Fig. Figure 4 shows a flowchart illustrating an embodiment of the method for mounting a brake actuation sensor device on a vehicle's braking system.

[0045] The braking systems described above, for example, can be produced using the method described below. However, it should be noted that the applicability of the method is not limited to the production of the braking systems described above.

[0046] In process step S1, (at least one) strain and / or compression measuring device of the subsequent brake actuation sensor device is arranged on the brake system such that the (at least one) strain and / or compression measuring device is reversibly varied in its extension along at least one predetermined spatial direction when a brake actuation element of the brake system is actuated, thereby changing at least one electrical property of the strain and / or compression measuring device. For this purpose, the strain and / or compression measuring device is arranged in direct or indirect contact with a brake booster housing assembly of the brake system such that a force exerted on the brake booster housing assembly causes a mechanical stress in the strain and / or compression measuring device.For example, the (at least one) strain and / or compression measuring device is arranged at least partially directly on and / or in the brake booster housing. Likewise, an intermediate piece with the (at least one) strain and / or compression measuring device arranged at least partially on and / or within it can be used between the brake booster housing and a vehicle wall component to which the brake booster housing is attached by means of at least one fastening component. Alternatively or additionally, the brake booster housing can be attached to a vehicle wall component by means of a fastening component with the (at least one) strain and / or compression measuring device arranged at least partially on and / or within it. Combinations of the embodiments described here are also possible.

[0047] In a process step S2 performed previously, simultaneously or subsequently, an evaluation device is arranged on the vehicle which, during operation of the brake actuation sensor device, determines at least one electrical quantity relating to the electrical property changed by a variation of the extension of the strain and / or compression measuring device along the at least one predetermined spatial direction and, taking into account the at least one determined electrical quantity, establishes an evaluation quantity relating to a brake actuation force exerted on a brake actuation element of the brake system.

Claims

[1] Brake booster housing assembly (20) for a vehicle brake system, which can be attached to a vehicle wall component (30) by means of a fastening component (36), comprising a brake actuation sensor device with: a strain and / or compression measuring device (24) which is configured such that the strain and / or compression measuring device (24) can be reversibly varied in its extent along at least one predetermined spatial direction (26), whereby at least one electrical property of the strain and / or compression measuring device (24) can be changed; and an evaluation device (28) by means of which at least one electrical quantity can be determined with respect to the electrical property which can be changed by varying the extension of the strain and / or compression measuring device (24) along the at least one predetermined spatial direction (26) and which, taking into account the at least one determined electrical quantity, can be determined with respect to a brake actuation force exerted on a brake actuation element (12) of the brake system; characterized by , that the strain and / or compression measuring device (24) is additionally designed such that the strain and / or compression measuring device (24) can be arranged in direct or indirect contact with a brake booster housing device (20) such that a force exerted on the brake booster housing device (20) by actuating the brake actuating element (12) causes a mechanical stress (σ) in the strain and / or compression measuring device (24) and the strain and / or compression measuring device (24) does not or does not perform any relative movement with respect to a vehicle wall component (30) when the brake actuating element (12) is actuated. [2] Brake booster housing assembly (20) according to claim 1, wherein the strain and / or compression measuring device (24) comprises at least one strain gauge. [3] Brake booster housing assembly (20) according to claim 1 or 2, wherein the strain and / or compression measuring device (24) is at least partially arranged or can be arranged directly on and / or in the brake booster housing assembly (20). [4] Brake booster housing assembly (20) according to one of the preceding claims, wherein the strain and / or compression measuring device (24) is at least partially arranged or can be arranged directly on and / or in an intermediate piece (50) which can be inserted between the brake booster housing assembly (20) and a vehicle wall component (30) to which the brake booster housing assembly (20) can be attached by means of at least one fastening component (36). [5] Brake booster housing assembly (20) according to one of the preceding claims, wherein the strain and / or compression measuring device (24) is at least partially arranged or can be arranged directly on and / or in the fastening component (36) by means of which the brake booster housing assembly (20) can be fastened to the vehicle wall component (30). [6] Brake booster housing assembly (20) according to claim 5, wherein the strain and / or compression measuring device (24) is arranged at least partially directly on and / or in a smart screw (36) as the fastening component (36). [7] Brake booster (14) with: a brake booster housing assembly (20) according to one of the preceding claims. [8] Intermediate piece (50) for attaching a brake booster housing assembly (20) to a vehicle wall component (30) with: a strain and / or compression measuring device (24) which is designed such that the strain and / or compression measuring device (24) can be reversibly varied in its extension along at least one predetermined spatial direction (26), whereby at least one electrical property of the strain and / or compression measuring device (24) can be changed, and which is arranged directly on the intermediate piece (50), wherein the intermediate piece (50) can be inserted between the brake booster housing assembly (20) and the vehicle wall component (30). [9] Braking system for a vehicle with: a brake booster (14) according to claim 7; an intermediate piece (50) according to claim 8; and / or a fastening component (36) for fastening the brake booster housing assembly (20) to a vehicle wall component (30). [10] Method for mounting a brake actuation sensor device on a vehicle brake system comprising the steps: Arranging a strain and / or compression measuring device (24) of the brake actuation sensor device on the brake system such that the strain and / or compression measuring device (24) is reversibly varied in its extension along at least one predetermined spatial direction (26) when a brake actuation element (12) of the brake system is actuated, thereby changing at least one electrical property of the strain and / or compression measuring device (24); and Arranging an evaluation device (28) on the vehicle, which, during operation of the brake actuation sensor device, determines at least one electrical quantity relating to the electrical property changed by a variation of the extension of the strain and / or compression measuring device (24) along the at least one predetermined spatial direction (26) and, taking into account the at least one determined electrical quantity, establishes an evaluation quantity relating to a brake actuation force exerted on the brake actuation element (12) of the brake system (S2); characterized by , that a brake booster housing assembly (20) is attached to a vehicle wall component (30) by means of a fastening component (36), and the strain and / or compression measuring device (24) is arranged in direct or indirect contact with the brake booster housing assembly (20) of the brake system such that a force exerted on the brake booster housing assembly (20) by actuating the brake actuating element (12) causes a mechanical stress (σ) in the strain and / or compression measuring device (24) (S1) and the strain and / or compression measuring device (24) does not or does not perform any relative movement with respect to a vehicle wall component (30) when the brake actuating element (12) is actuated. [11] Method according to claim 10, wherein the strain and / or compression measuring device (24) is arranged at least partially directly on and / or in the brake booster housing device (20). [12] Method according to claim 10 or 11, wherein an intermediate piece (50) with the strain and / or compression measuring device (24) arranged at least partially thereon and / or on it is inserted between the brake booster housing assembly (20) and the vehicle wall component (30) to which the brake booster housing assembly (20) is attached by means of at least one fastening component (36).

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