EASILY ADJUSTABLE LIFT SENSOR AND METHOD FOR INSTALLING IT

Abstract

Method for installing a stroke sensor (1), wherein the stroke sensor (1) comprises: a magnetic field detection element (21) that detects a magnetic field; a magnet (3) that generates the magnetic field and is movable in a first direction (X) relative to the magnetic field detection element (21); and a processor (22) that outputs an indicator value based on the magnetic field detected by the magnetic field detection element (21), wherein the indicator value indicates a position of the magnet (3) relative to the magnetic field detection element (21), wherein the method comprises the following steps: obtaining a relationship between the magnetic field and the indicator value while the magnet (3) is moved in the first direction (X) relative to the magnetic field detection element (21) within a predetermined relative range of motion, and writing the relationship to the processor (22);After the relationship is written to the processor (22), prevent the predetermined relative range of motion from being displaced in the first direction (X) by means of a device (5, 4A, 4B) for preventing position displacement, wherein the device (5, 4A, 4B) comprises an element that fixes relative positions between the magnetic field detection element (21) and the magnet (3); attach the magnet (3) and the magnetic field detection element (21), which have been prevented from being displaced, to different structures (33, 24) that are movable relative to each other in the first direction (X), and remove the device (5, 4A, 4B).

Description

BACKGROUND OF THE INVENTION Area of ​​the invention

[0001] The present application is based on and claims priority from JP2020-27997, filed on 21 February 2020, the disclosure of which is hereby incorporated in full by reference.

[0002] The present invention relates to a stroke sensor, a method for installing the same, a method for manufacturing a braking system and a system containing the stroke sensor. Description of the state of the art

[0003] A displacement sensor is used in various applications, such as in a vehicle's transmission and brakes. A displacement sensor comprises a magnetic field sensing element, which detects a magnetic field, and a magnet, which generates a magnetic field that is detected by the magnetic field sensing element. The magnet is moved relative to the magnetic field sensing element. A displacement sensor outputs a voltage that indicates the position of the magnet relative to the magnetic field sensing element. When a displacement sensor is installed in a device, the magnet is moved relative to the magnetic field sensing element beforehand to establish the relationship between the magnetic field and the output voltage. To replicate this relationship in the device, it is necessary to prevent any positional movement between the magnet and the magnetic field sensing element once these components are installed.JP6044599 discloses a sensor comprising a light-generating section, a light-sensing section, and a light scale arranged between the light-generating and light-sensing sections. The light-generating and light-sensing sections must be positioned opposite each other in accordance with a predetermined positional relationship. For this purpose, the light-generating and light-sensing units are mounted on a flexible substrate, and the flexible substrate is bent such that the light-generating and light-sensing units are positioned opposite each other in accordance with the predetermined positional relationship. SUMMARY OF THE INVENTION

[0004] In the method described in JP6044599 for avoiding positional shifts, the light generation section and the light detection section are mounted on a flexible substrate. Therefore, this method cannot be applied to a stroke sensor where a magnetic field detection element and a magnet are attached to different structures that move relative to each other.

[0005] The object of the present invention is to provide a method for installing a stroke sensor in which the stroke sensor can be adjusted using a simple method.

[0006] The method relates to a stroke sensor comprising: a magnetic field sensing element that detects a magnetic field; a magnet that generates the magnetic field and is movable in a first direction relative to the magnetic field sensing element; and a processor that outputs an indicator value based on the magnetic field detected by the magnetic field sensing element, the indicator value indicating a position of the magnet relative to the magnetic field sensing element.

[0007] The method comprises the following steps: obtaining a relationship between the magnetic field and the indicator value while the magnet is moved in the first direction relative to the magnetic field sensing element within a predetermined relative range of motion, and writing the relationship to the processor; after the relationship has been written to the processor, preventing the predetermined relative range of motion in the first direction from being displaced by means of a device for preventing position displacement, wherein the device includes an element that fixes relative positions between the magnetic field sensing element and the magnet; attaching the magnet and the magnetic field sensing element, which have been prevented from being displaced, to different structures that are movable relative to each other in the first direction, and removing the device.

[0008] According to the present invention, it is possible to provide a method for installing a stroke sensor, so that the stroke sensor can be adjusted using a simple method.

[0009] The above and other objects, features and advantages of the present invention will become apparent from the following description with reference to the accompanying drawings, which illustrate examples of the present invention. List of characters Fig. 1A to Fig. Figures 1B are schematic views showing the arrangement of a stroke sensor according to an embodiment of the present invention; Fig. 2A to Fig. 2B are conceptual views that show the relationship between the relative position of a magnet of the stroke sensor and the output voltage; Fig. 3 is an example of a conversion formula used for calibrating the stroke sensor; Fig. Figure 4 is a view showing the influence of positional displacement on measurement accuracy; Fig. 5A to Fig. 5H are views that show a procedure for calibrating the stroke sensor and installing the stroke sensor in a real device; Fig. Figure 6 is a perspective view of the stroke sensor and a fastening element. Fig. 7 to Fig. Figure 9 shows schematic views illustrating the arrangement of the stroke sensors according to various modifications; and Fig. Figure 10 is a schematic view showing the arrangement of a braking system that includes the stroke sensor of the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] With reference to the drawings, a method for installing a lift sensor is described. 1 as described according to one embodiment of the present invention. In the following descriptions, the direction in which the magnet3 The direction in which the object is moved is referred to as a first direction or the X-direction. This direction is perpendicular to the X-direction and perpendicular to the magnetic field detection element. 21 surface facing the magnet 3 The direction in which the magnet is positioned is referred to as the Y-direction. The term "relative position" or "relative position of magnet 3" refers to the position of the magnet. 3 in the X-direction relative to the magnetic field detection element 21 , unless otherwise defined.

[0011] Fig. Figure 1A shows a schematic view of the stroke sensor. 1 , which is installed in a vehicle or the like, and Fig. Figure 1B shows a schematic exploded view. The stroke sensor 1 has a sensor arrangement 2 , which includes a magnetic field detection element 21 , which detects a magnetic field, and a processor 22 as well as a magnet 3contains a magnetic field that generates a magnetic field detected by the magnetic field detection element. 21 is detected. The magnet 3 comprises three partial magnets 31 , which are aligned at equal intervals in the X direction, and a yolk 32 , which the partial magnets 31 They connect each other. The N-pole and the S-pole alternate on the surfaces of the three partial magnets. 31 arranged, which correspond to the magnetic field detection element 21 are facing each other. The magnet 3 is based on a first structure 33 e.g. a carrier plate, held in place by screws (not shown), and the first structure 33 is connected to a moving element, e.g., a brake pedal (not shown). The magnet 3 is in the X direction relative to the sensor arrangement 2 , i.e., to the magnetic field detection element 21 , movable. By detecting the position of the magnet. 3relative to the magnetic field detection element 21 For example, the amount of pressure applied to a brake pedal can be detected. A stopper (not shown) can be provided to limit the range of motion of the first structure. 33 to limit in the X direction.

[0012] The sensor arrangement 2 is attached to a second structure 24 attached, which extend from the first structure 33 differs. The second structure 24 is in the X direction relative to the first structure 33 movable. The sensor assembly 2 has a case 23 , which is the magnetic field detection element 21 and the processor 22 carries. The magnetic field detection element 21 is on the surface of the case 23 arranged to attract the magnet 3 is facing it. If the second structure 24 a space for the magnetic field detection element 21 and the processor 22exhibits the case 23 Omitted. The magnetic field detection element 21 The sensor assembly comprises an element that detects a magnetic field in the X-direction and an element that detects a magnetic field in the Y-direction (both not shown). The type of these elements is not restricted; a Hall element, a TMR element, a GMR element, etc., can be used. 2 is preferably immobile, as a power cable, an output cable, etc. are connected to the sensor assembly. 2 are connected. Accordingly, the sensor assembly 2 immobile, and the magnet 3 In the present embodiment, the sensor assembly is movable. 2 However, it can also be movable and the magnet 3 be immobile. The sensor assembly 2 has a pair of collars 25 , which are attached to the second structure 24 are attached. Each collar 25 has a mounting opening 26, through which the screw 7 is inserted. With the screw 7 will the sensor assembly 2 at the second structure 24 fastened. The threaded hole 30 , into which the screw 7 intervenes, is in the second structure 24 trained. The mounting hole 26 is a slot that is elongated in the first direction (i.e., the dimension D1 in the first direction is larger than the dimension D2 (in the direction perpendicular to the first direction). Thus, it is possible to determine the position of the sensor array. 2 in the X direction relative to the second structure 24 to adjust. Also, the threaded hole 27 , into which the screw 4A intervenes at the end surface 29 the sensor arrangement 2 formed in the X direction. The threaded hole 34 , into which the screw 4B intervenes at the end surface 36 of the magnet3 formed in the X direction.

[0013] The processor 22 It calculates and outputs an indicator value S, which represents the relative position of the magnet. 3 based on the magnetic field displayed by the magnetic field detection element 21 is detected. Three partial magnets 31 They generate a magnetic flux with an essentially sinusoidal shape across them. Assume that the X-component and Y-component of the magnetic flux at a given position are Bx and By, respectively. Then the angle θ of the magnetic flux relative to the X-direction at that position (hereafter referred to as the angle θ of the magnetic field) can be expressed by arctan (By / Bx). The magnetic field around the magnet 3 can be determined in advance through analysis, etc. Since the distance between the magnetic field detection element 21 and the magnet 3 If the position in the Y direction is known, the relative position of the magnet can be determined. 3This can be calculated if the angle θ of the magnetic field is obtained. The processor 22 calculates the angle θ of the magnetic field = arctan (By / Bx) from Bx and By, which are measured by the magnetic field detection element 21 The device detects the angle θ of the magnetic field, converts it into an output voltage V corresponding to the relative position, and outputs this voltage. The angle θ of the magnetic field can be detected over a range of 0 to 360°. Therefore, the displayed value S is the output voltage V determined based on the angle θ of the magnetic field.

[0014] The relationship between the relative position and the output voltage V is typically curvilinear and can be expressed by a curved line resembling a cubic function, as shown by the solid line in Fig. 2A is shown. Accordingly, before installing the stroke sensor... 1 into an actual device for each hub sensor 1A calibration was performed to convert the relationship between the relative position and the output voltage V into a linear relationship. The calibration procedure is now described.

[0015] First, the magnet 3 and the sensor arrangement 2 at the calibration device 6 attached (see Fig. 4 and Fig. 5A to Fig. 5E). The calibration device 6 has a first support structure 33C , which is the first structure 33 simulated, at which the magnet 3 is attached, and a second support structure 24C , which is the second structure 24 simulated, where the sensor arrangement 2 is attached. The calibration device 6 has essentially the same configuration as the one in Fig. 1. Actual device shown, excluding error factors such as manufacturing defects. The calibration device6 calculates the angle θ of the magnetic field = arctan (By / Bx), while the magnet 3 in the X direction relative to the sensor arrangement 2 As the device is moved, it converts the angle θ of the magnetic field into an output voltage V corresponding to the relative position and outputs the output voltage V. The relationship between the relative position and the output voltage V is shown by the solid line in Fig. 2A expressed.

[0016] Next, a line is calculated that represents the output voltages. V1 and V2 The line connects the two ends of the movement range. This line is considered the relationship between the relative position and the calibrated output voltage V (hereinafter referred to as output voltage W). The relationship between the relative position and the output voltage W is a linear function. To obtain this relationship, the processor has... 22about conversion devices that convert the angle θ of the magnetic field into the output voltage W. The conversion devices are shown as a conversion card in Fig. Figure 3 is shown. For simplicity, the conversion devices are in Fig. 3 is shown as a diagram, but the conversion mechanisms are actually stored as a table in the processor's memory. 22 The conversion map is stored as a set of θ0, θ1, θ2,..., θ N-2 , θ N-1 , θ N compared to the output voltage Wo, W1, W2,...,W N-2 , W N-1 , W N (where Δθ=θ i -θ i-1=360° / N) is generated (N is a natural number). N is chosen, for example, from a range between 30 and 40. In the present embodiment, the conversion means convert the angle θ of the magnetic field into the output voltage W, but the output voltage V can also be converted into the output voltage W. In this way, during calibration, the relationship between the magnetic field and the indicator values ​​is preserved, while the magnet 3 in the X-direction relative to the magnetic field detection element 21 is moved within a predetermined relative range of motion, and the relationship is entered into the processor. 22 written.

[0017] The stroke sensor 1 It works in the following way: Magnetic field detection element 21 the sensor arrangement 2 The processor detects Bx and By. 22 The processor calculates the angle θ of the magnetic field = arctan (By / Bx). 22The angle θ of the magnetic field is converted into an output voltage W, corresponding to the relative position, using the converter device, and the output voltage W is displayed. The angle θ of the magnetic field is calculated from the conversion card by interpolation as needed. In this way, the stroke sensor provides 1 an output voltage W which is linearly related to the relative position of the magnet 3 stands.

[0018] However, there is a possibility that the relationship between the relative position and the output voltage W, i.e., that shown by the dashed line in Fig. The relationship shown in 2A is not maintained when the magnet 3 at the first structure 33 and the calibrated sensor assembly 2 at the second structure 24 is attached. For example, due to manufacturing tolerances, which affect both the initial structure 33 as well as the second structure24 exhibit the positions of the magnet 3 and the sensor arrangement 2 be relatively displaced in the X-direction. This positional shift can also occur if the magnet 3 at the first structure 33 or the sensor arrangement 2 at the second structure 24 is attached. The positions of the sensor assembly 2 and the magnet 3 They may also differ if they are attached by an adhesive or similar substance.

[0019] Fig. Figure 4 conceptually illustrates the influence of positional displacement on measurement accuracy. As in the section above in Fig. Figure 4 shows that calibration is assumed to have been performed when the sensor arrangement 2 at a predetermined position of the second support 24C is attached. In an actual device located in the middle part in Fig. The sensor arrangement shown in 4 is 2at the second structure 24 The magnet is mounted in a position shifted to the right. 3 It is attached in the same position as during calibration. That is, the position of the sensor assembly. 2 relative to the magnet 3 After installation in the actual device, the sensor assembly is shifted by a distance D compared to its position during calibration. In this case, the sensor assembly installed in the actual device detects the error. 2 that the magnet 3 at the position in the middle part in Fig. 4 is positioned as indicated by the dashed line in the lower part in Fig. 4 shown. In other words, when the end of the magnet 3 at the position X1 located opposite the position X0 The sensor unit is shifted to the right by a distance D. 2 the output voltage W, which is to be output when the end of the magnet is3 at the position X0 is located. As a result, the output line is shifted by a distance D, as shown in Fig. 2B shown, and the measurement accuracy of the stroke sensor 1 deteriorates. It should be noted that the position of the sensor unit... 2 relative to the magnet 3 after installation in the actual device and the position of the sensor unit 2 relative to the magnet 3 during calibration in the Z-direction (the direction perpendicular to the X-direction and Y-direction in Fig. 1) may be offset from each other. However, the Z-direction is not a direction in which the stroke sensor 1A position is detected, and the distribution of the magnetic field does not change significantly in the Z-direction. Therefore, the positional displacement in the Z-direction has no significant impact on the measurement accuracy. The measurement error in the Z-direction is smaller, on the level of one digit, than the measurement error caused by the same level of positional displacement as in the X-direction. The measurement error when the position of the sensor assembly 2 relative to the magnet 3 after installation in the actual device and the position of the sensor assembly 2 relative to the magnet 3 The error that can be shifted against each other in the Y direction during calibration is approximately the same as the measurement error caused by the position shift in the Z direction.

[0020] In other words, the problem mentioned above means that the predetermined relative range of motion is shifted in the X-direction during calibration when the stroke sensor 1 is installed in an actual device. For example, if a range of ±10mm, centered on the magnetic field detection element. 21 , the predetermined relative range of motion during calibration, and the magnetic field detection element 21 If it is mounted with a displacement of 1mm on the positive side, then there is a range from -11mm to 9mm, centered on the magnetic field detection element. 21 , the actual relative range of motion. That is, the specified relative range of motion is shifted by 1 mm towards the negative side. To prevent this positional shift, the calibration of the stroke sensor is therefore carried out in the present embodiment. 1 and the installation of the hub sensor 1in an actual device in the following manner.

[0021] First, the mounting element is removed before calibration. 5 at the end face of the sensor assembly 2 appropriate as in Fig. 5A shown. The fastening element 5 is a plate with a top hole 51 and a lower bore 52 , through the screws 4A , 4B to be introduced. To avoid influencing the calibration, the fastening element 5 preferably made of a non-magnetic material, but the material is not particularly limited, and metal, resin, and the like can also be used. The fixing element 5 will be temporarily attached to the sensor unit 2 fastened by the screw 4A through the upper bore 51 is inserted and the screw 4A into the threaded hole 27intervenes. The lower half of the fastening element 5 overlaps with the magnet's range of motion 3 Next, as in Fig. 5B shown, the sensor unit 2 and the magnet 3 at the calibration device 6 attached. In particular, the sensor assembly is 2 on the second support structure 24C attached, which forms the second structure 24 simulated, and the magnet 3 will be attached to the first support structure 33C attached, which forms the first structure 33 simulated. Next, as in Fig. 5C shown, by moving the first support structure 33C the magnet 3 moved in the X direction until the magnet 3 to the fastening element 5 encounters. Next, as in Fig. 5D shown, a calibration was performed by adjusting the position of the magnet. 3 to the fastening element 5The device is set to one end of a predetermined relative range of motion, and the relationship between the angle θ of the magnetic field and the output voltage W is determined. Since the fastening element 5 not attached to the magnet at this stage 3 Once attached, the magnet can 3 relative to the sensor unit 2 can be moved freely.

[0022] Next, as in Fig. 5E shown, the magnet 3 moved until the magnet 3 back to the fastening element 5 impacts, and the fastening element 5 is attached to the end face of the magnet 3 secured in the impact position. The fastening element 5 is temporarily attached to the magnet 3 fastened by the screw 4B through the lower hole 52 of the fastening element 5 is inserted and the screw 4B into the threaded hole 34intervenes. The fastening element 5 is applied to the end faces of the magnet 3 and the sensor arrangement 2 attached on the same side with respect to the X-direction. Since the positioning of the sensor assembly 2 and the magnet 3 in the X direction is achieved by the magnet 3 against the fixing element 5 If an impact occurs, positioning accuracy can easily be ensured. Furthermore, the configuration of the fastening element 5 simplified. Next, as in Fig. 5F shown, the stroke sensor 1 , on which the fixing element 5 was attached by the calibration device 6 removed.

[0023] Next, as in Fig. 5G shown, the hub sensor 1 , on which the fastening element 5 was attached, installed in an actual device. First, the magnet is 3at the first structure 33 attached. The sensor unit 2 will then be applied to the second structure 24 attached. Since the mounting opening 26 the sensor assembly 2 Since the slot is elongated in the X direction, the sensor assembly can 2 , as described above, using the screw 7 at the second structure 24 to be attached while the fastener 5 is appropriate. After that, as in Fig. 5H shown, the fastening element 5 removed. Fig. Figure 6 shows a perspective view of the stroke sensor. 1 and the fastening element 5 .

[0024] In this way, according to the present embodiment, a displacement of the predetermined relative range of motion in the X-direction is effected by the fixing element. 5 prevented. The sensor arrangement free from positional displacement. 2and the magnet 3 are then applied to different structures that are movable relative to each other in the X-direction. 24 , 33 The device is attached, and then means for preventing position displacement or a device for preventing position displacement are removed. The means for preventing position displacement or the device for preventing position displacement comprise an element that defines the relative positions between the magnetic field detector element. 21 and the magnet 3 fixed, i.e. a fixing element 5 , which is located at the sensor arrangement 2 and the magnet 3 is attached, as well as temporary fixatives that the fixative element 5 temporarily on the sensor array 2 and the magnet 3 to fix. The temporary fasteners are screws. 4A , 4B , but the fastening element 5can also be temporarily attached to the sensor arrangement 2 and the magnet 3 They can be attached, e.g. by snap-on mounting.

[0025] In the present embodiment, the automatic and precise positioning of the sensor assembly is achieved. 2 by positioning the magnet 3 performed when the stroke sensor 1 is attached to an actual device. After the first magnet 3 and the sensor assembly 2 Once installed in an actual device, only the mounting element is required. 5 be removed. Generally, the calibration of the stroke sensor is performed. 1 from the manufacturer of the stroke sensor 1 carried out, but the adjustment of the stroke sensor 1 , after it has been installed in an actual device, by the manufacturer of the assembly into which the stroke sensor is installed 1is built-in, or performed by the manufacturer of the final product. Since, in the present embodiment, the adjustment of the stroke sensor 1 Since no further action is required after installation in an actual device, the process carried out by the manufacturer of the assembly or the final product is simplified, and the added value of the stroke sensor is reduced. 1 increased.

[0026] As mentioned above, the environment in which the sensor unit is located differs. 2 and the magnet 3 are attached to an actual device, from the environment in which the sensor unit is located 2 and the magnet 3 at the calibration device 6 are installed. In the environment where the sensor assembly is located. 2 and the magnet 3When attached to an actual device, space is required for arranging and removing the means for preventing positional displacement or the device for preventing positional displacement. For this purpose, space is preferably provided near the aligned surfaces of the second structure. 24 and the magnet 3 a space S with a given size (see Fig. 6) formed. The space S is formed taking into account the space for arranging the fastening element. 5 as well as the space for removing the screws 4A , 4B and the space for arranging tools for removing the screws 4A , 4B certainly.

[0027] In the present embodiment, high-precision calibration can also be performed when the magnet 3 is only movable to limited positions, i.e., only discretely movable. For example, the first structure 33with an element, such as a plunger, that is configured to stop only at both ends of the range of motion. If the stroke sensor calibration 1 is carried out after the stroke sensor 1 When a stroke sensor is installed in an actual device, the measurements that can be used for calibration are limited to the values ​​measured at those two points. In the present embodiment, the accuracy of the calibration can be improved because the calibration can be performed using measurements at multiple points before the stroke sensor is installed. 1 is installed in an actual device.

[0028] One embodiment of the present invention has been described above, but the present invention is not limited to the present embodiment. As described in Fig. As shown in 7, the fastening element 105for example, a rotation prevention section 53 exhibiting a feature that prevents the sensor arrangement from changing 2 and the magnet 3 Rotate around axes parallel to the X-direction. The rotation prevention section. 53 is a first intervention phase 53 , which is on the surface of the fastener 5 is trained to be attracted to the magnet 3 and the sensor assembly 2 is facing the sensor assembly. 2 and the magnet 3 have second intervention phases 28 , 35 , each of which is in the first intervention phase 53 intervene. The first intervention phase 53 is a groove, and the second engagement sections 28 , 35 are ribs that engage in the groove, but the first engagement section 53 It could be a rib, and the second intervention sections 28 , 35 They can be grooves.

[0029] As in Fig. As shown in 8, the fastening element can 5 on the side surfaces of the sensor array 2 and the magnet 3 to be attached. If on the side of the sensor assembly 2 and the magnet 3 a space for the fastening element 5 If present, it may be advantageous to use the fastening element 5 on the side surfaces of the sensor array 2 and the magnet 3 to attach.

[0030] As in Fig. As shown in 9, the magnet can 3 a single magnet. The intensity of the magnetic flux By in the Y direction, emitted by the magnetic field detection element. 21 The amount detected changes depending on the relative position of the magnet. 3 Accordingly, the intensity of the magnetic flux By can be used as an indicator value for the relative position of the magnet. 3can be used. In other words, in this modification, the indicator value S is an output voltage determined based on the intensity of a magnetic field.

[0031] Furthermore, calibration can be omitted. As in Fig. As shown in 2A, it is for the output characteristic of the stroke sensor. 1 It is advantageous to linearize the relationship between the relative position and the output voltage through calibration, but linearization is not strictly necessary. Omitting calibration simplifies the manufacturing process.

[0032] As an example of a device or system that uses the aforementioned stroke sensor 1 used, shows Fig. 10 the braking system 8 The braking system 8 has a brake pedal 81 , a brake booster 82 , which has an initial structure 33 with the brake pedal 81connected to a main cylinder 83 , which is connected to the brake booster 82 is connected to a hydraulic control circuit 84 , which is connected to the main cylinder 83 is connected, and a brake caliper 85 , which are connected to the hydraulic control circuit 84 is connected. The storage container 86 is connected to the master cylinder 83 connected. The hub sensor 1 is on the servo motor 82 attached, and the second structure 24 is the servo motor 82 The hub sensor 1 can be attached to the vehicle body, the adjustment of the lift sensor 1 However, it can also occur within the braking system. 8 This is done by the stroke sensor 1 at the brake booster 82 is attached. The one from the brake pedal 81 The applied braking force is increased by the brake booster. 82 reinforced and connected to the hydraulic control circuit 84transferred. The amount of brake pedal depressor applied. 81 , which is from the lift sensor 1 The detected signal is also sent to the hydraulic control circuit. 84 transferred. The hydraulic control circuit 84 supplies the brake caliper 85 with brake fluid depending on the force with which the brake pedal is pressed 81 The braking system 8 is manufactured as follows. First, the stroke sensor is 1 prepared. The lifting sensor 1 was adjusted according to the procedure described above, and the fastening element 5 was at the lifting sensor 1 installed. Then the braking system is... 8 except for the stroke sensor 1 assembled. Then the magnet 3 at the first structure 33 and the sensor unit 2 at the brake booster 82 (second structure) 24 ) is attached. Then the fastener is 5from the first structure 33 and the brake booster 82 removed.

[0033] Although a particular preferred embodiment of the present invention has been shown and described in detail, it should be understood that various changes and modifications may be made without departing from the spirit or scope of the attached claims. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] JP 2020027997

[0001] JP 6044599 [0003, 0004]

Claims

[1] Method for installing a stroke sensor (1) wherein the stroke sensor (1) comprises: a magnetic field detection element (21) that detects a magnetic field; a magnet (3) that generates the magnetic field and that is movable in a first direction (X) relative to the magnetic field detection element (21); and a processor (22) that outputs an indicator value based on the magnetic field detected by the magnetic field detection element (21), wherein the indicator value indicates a position of the magnet (3) relative to the magnetic field detection element (21), the procedure comprises the following steps; Obtaining a relationship between the magnetic field and the indicator value while the magnet (3) is moved in the first direction (X) relative to the magnetic field detection element (21) within a predetermined relative range of motion, and writing the relationship to the processor (22); After the relationship is written to the processor (22), prevent the predetermined relative range of motion in the first direction (X) from being shifted by means of a device (5, 4A, 4B) to prevent a position shift, wherein the device (5, 4A, 4B) comprises an element that fixes relative positions between the magnetic field detection element (21) and the magnet (3); Attaching the magnet (3) and the magnetic field detection element (21), which were prevented from being moved, to different structures (33, 24) that are movable relative to each other in the first direction (X), and removing the clamping device (5, 4A, 4B). [2] Method according to claim 1, wherein the device comprises (5, 4A, 4B): a fastening element (5) which rests against a sensor arrangement (2) and the magnet (3), wherein the sensor arrangement (2) contains the magnetic field detection element (21); and temporary fastening means (4A, 4B) that temporarily fasten the fastening element (5) to both the sensor assembly (2) and the magnet (3). [3] Method according to claim 2, wherein the fastening element (5) is attached to an end face of the sensor arrangement (2) and an end face of the magnet (3), both end faces pointing in the same direction in the first direction (X). [4] the method according to claim 3, wherein, the fixing element (5) is attached to the end face of the sensor arrangement (2), the magnet (3) is then moved until the magnet (3) is in contact with the fixing element (5), and the relationship is then obtained by setting a mounting position such that it is one end of the predetermined relative range of motion, wherein the mounting position is a position in which the magnet (3) is in contact with the fixing element (5), and After the relationship has been written to the processor (22), the magnet (3) is moved to bump against the fixing element (5) again, and the magnet (3) is attached to the fixing element (5) in the bumping position. [5] Method according to any one of claims 2 to 4, wherein the fastening element (5) is a plate and the temporary fastening means (4A, 4B) is a screw. [6] Method according to any one of claims 2 to 5, wherein the fastening element (5) has a rotation prevention section (53) which prevents the sensor arrangement (2) and the magnet (3) from rotating about axes parallel to the first direction (X). [7] Method according to claim 6, wherein the rotation prevention section (53) is a first engagement section (53) that the fastening element (5) has, and the sensor arrangement (2) and the magnet (3) each have a second engagement section (28, 35) that engages with the first engagement section (53). [8] Method according to any one of claims 2 to 7, wherein the fastening element (5) is non-magnetic. [9] Method according to any one of claims 1 to 8, wherein the sensor arrangement (2) has a collar (25) which is attached to the structure (24), the collar (25) has a hole (26) through which a screw (7) for attaching the sensor arrangement (2) to the structure (25) is inserted, and the hole (26) is a slot which is elongated in the first direction (X). [10] Method according to any one of claims 1 to 9, wherein the relationship is expressed by a linear function. [11] Method according to any one of claims 1 to 10, wherein the indicator value is an output voltage of the stroke sensor (1), wherein the output voltage is based on an angle of the magnetic field, wherein the angle is obtained from the magnetic field detected by the magnetic field detection element (21). [12] Method according to any one of claims 1 to 10, wherein the indicator value is an output voltage of the stroke sensor (1), wherein the output voltage is based on the intensity of the magnetic field, wherein the intensity is obtained from the magnetic field detected by the magnetic field detection element (21). [13] Method for manufacturing a brake system according to any one of claims 1 to 12, wherein the various structures (33, 24) are a first structure (33) and a booster (82) and the first structure (33) is connected to a brake pedal (81), the method comprising the following steps: Attaching the magnet (3) to the first structure (33), wherein the clamping device (5, 4A, 4B) is attached to the magnet (3); and Attaching the magnetic field detection element (21) to the booster (82), wherein the clamping device (5, 4A, 4B) is attached to the magnetic field detection element (21). [14] Stroke sensor (1), comprising: a magnetic field detection element (21) that detects a magnetic field; a magnet (3) that generates the magnetic field and that is movable in a first direction (X) relative to the magnetic field detection element (21); and a processor (22) that outputs an indicator value based on the magnetic field detected by the magnetic field detection element (21), wherein the indicator value indicates a position of the magnet (3) relative to the magnetic field detection element (21), wherein, the magnet (3) and the magnetic field detection element (21) can be attached to different structures (33, 24) that are movable relative to each other in the first direction (X), such that the magnet (3) is movable relative to the magnetic field detection element (21) in the first direction (X) within a predetermined relative range of motion, and a relationship between the magnetic field and the indicator value is written to the processor (22), The stroke sensor (1) further comprises a device (5, 4A, 4B) for preventing a position displacement, wherein the device (5, 4A, 4B) includes an element that prevents the predetermined relative range of motion in the first direction (X) from being displaced when the magnet (3) and the magnetic field detection element (21) are attached to the various structures (33, 24), and the clamping device (5, 4A, 4B) can be removed after the magnet (3) and the magnetic field detection element (21) have been attached to the various structures (33, 24). [15] A system comprising a stroke sensor (1); a first structure (33); a magnet (3) which is attached to the first structure (33) and generates a magnetic field; a second structure (24) that is movable in a first direction (X) relative to the first structure (33); and a magnetic field detection element (21) attached to the second structure (24) that detects the magnetic field, wherein, the magnet (3) and the magnetic field detector element (21) are attached to the first structure (33) and the second structure (24) respectively such that the magnet (3) is movable in the first direction (X) relative to the magnetic field detector element (21) within a predetermined relative range of motion, and a space (S) is formed near surfaces of the second structure (24) and the magnet (3), with the surfaces pointing in the same direction. [16] System according to claim 15, wherein the space (S) enables the placement and removal of a device (5, 4A, 4B) to prevent a positional displacement, wherein the device (5, 4A, 4B) prevents the predetermined relative range of motion in the first direction (X) from deviating when the magnetic field detection element (21) and the magnet (3) are attached to the first structure (33) and the second structure (24), respectively. [17] Method for installing a stroke sensor (1) wherein the stroke sensor (1) comprises: a magnetic field detection element (21) that detects a magnetic field; a magnet (3) that generates the magnetic field and that is movable in a first direction (X) relative to the magnetic field detection element (21); and a processor (22) that outputs an indicator value based on the magnetic field detected by the magnetic field detection element (21), wherein the indicator value indicates a position of the magnet (3) relative to the magnetic field detection element (21), the procedure comprises the following steps; Obtaining a relationship between the magnetic field and the indicator value while the magnet (3) is moved in the first direction (X) relative to the magnetic field detection element (21) within a predetermined relative range of motion, and writing the relationship to the processor (22); after writing the relationship into the processor (22), preventing a displacement of the predetermined relative range of motion in the first direction (X) by means (5, 4A, 4B) to prevent a position displacement; Attaching the magnet (3) and the magnetic field detection element (21), which have been prevented from being displaced, to different structures (33, 24) which are movable relative to each other in the first direction (X), and removing the means (5, 4A, 4B) to prevent a positional displacement.

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