Pedal travel sensor and brake system

Abstract

The utility model discloses a pedal travel sensor and a control system. The pedal travel sensor comprises a fixedly arranged shell; the sliding body is associated with the action of a pedal, and the sliding body is movably arranged in the shell; the magnetic element and the sliding body are arranged into a whole; and the fixedly arranged printed circuit board assembly at least comprises a printed circuit board, and the printed circuit board responds to the magnetic field change generated by the magnetic element along with the movement of the sliding body so as to convert the movement amount of the sliding body into an electric signal to be output. The pedal travel sensing device is simple in structure, high in integration level, capable of accurately sensing the pedal travel and high in reliability.

Description

Technical Field

[0001] The utility model relates to a sensor device, in particular to a pedal stroke sensor device. Background Art

[0002] The vehicle braking system is an important part of automobile safety. Its main function is to slow down the moving vehicle or stop it when necessary.

[0003] The braking system of a modern vehicle typically consists of a brake pedal, which the driver activates by depressing it, and a brake control system, such as an electric brake system.

[0004] Currently, electric brake systems (EBS) are more widely used in commercial vehicles. The pedal travel sensor (PTS) is an essential sensor for EBS brake pedal modules. Its primary function is to convert pedal displacement into a PWM position signal, which is then transmitted to the EBS's BCU for brake control.

[0005] However, the current pedal travel sensor has a complex structure and its design, verification and manufacturing costs are high. Utility Model Content

[0006] One of the purposes of the present invention is to provide a pedal stroke sensor which has a simple structure, high integration and high adaptability, and can accurately sense the pedal stroke and has high reliability.

[0007] In order to achieve the above objectives, the present invention proposes a pedal travel sensor, which includes:

[0008] A fixedly set housing;

[0009] a sliding body, which is associated with the movement of the pedal, and the sliding body is movably disposed in the housing;

[0010] a magnetic element integrally provided with the sliding body;

[0011] The fixed printed circuit board assembly comprises at least a printed circuit board, which responds to the change of the magnetic field generated by the magnetic element as the sliding body moves, so as to convert the movement of the sliding body into an electrical signal output.

[0012] Furthermore, in the pedal stroke sensor described in the present invention, the magnetic element is configured as a magnetic layer integrated on the outer wall of the sliding body.

[0013] Furthermore, in the pedal stroke sensor of the present invention, the magnetic layer is arranged in an annular shape along the circumferential direction of the sliding body.

[0014] Furthermore, in the pedal stroke sensor of the present invention, the magnetic layer is provided in a block shape at a position corresponding to the printed circuit board assembly.

[0015] Furthermore, in the pedal stroke sensor described in the present invention, a groove is provided on the outer wall of the sliding body, and the magnetic layer is provided in the groove.

[0016] Furthermore, in the pedal stroke sensor described in the present invention, the magnetic layer is clamped in the groove with an interference fit.

[0017] Furthermore, in the pedal stroke sensor described in the present invention, the magnetic layer is formed on the outer wall of the sliding body through a coating process, or the magnetic layer is adhered to the outer wall of the sliding body.

[0018] Furthermore, in the pedal travel sensor described in the present invention, the magnetic element includes at least one of a neodymium iron boron magnet, ferrite or magnetic rubber.

[0019] Furthermore, in the pedal stroke sensor described in the present invention, the printed circuit board assembly further includes a shell, which is fixedly connected to the outer shell, and the printed circuit board is arranged in the outer shell.

[0020] Furthermore, in the pedal stroke sensor described in the present invention, a sealing groove is provided on the connecting end surface where the shell and the outer shell are connected, and a sealing element is provided in the sealing groove.

[0021] Another object of the present invention is to provide a braking system that is based on a pedal travel sensor and accurately senses the pedal travel with high reliability.

[0022] Based on this, the present invention also provides a braking system, which includes the pedal travel sensor as described above.

[0023] The utility model also provides a braking system, which includes the brake pedal assembly as described above.

[0024] The pedal stroke sensor of the present invention has a simple structure, high integration and high adaptability, and can simultaneously realize accurate sensing of the pedal stroke and has high reliability.

[0025] The pedal stroke sensor of the present invention has a convenient and accurate sensing process and can be used in vehicle braking systems, especially electric braking systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of the external structure of the pedal stroke sensor described in the present invention in one embodiment is shown.

[0027] Figure 2 A cross-sectional view of a pedal travel sensor according to the present invention is shown in one embodiment.

[0028] Figure 3 The housing is hidden and the three-dimensional structure of the sliding body and the printed circuit board assembly of the pedal stroke sensor according to one embodiment of the present invention is shown.

[0029] Figure 4 The figure shows a magnetic layer of a pedal travel sensor according to the present invention in one embodiment.

[0030] Figure 5 The figure shows the magnetic layer of the pedal travel sensor according to another embodiment of the present invention.

[0031] Figure 6 The pedal travel sensor of the present invention is shown as a sliding body provided with a magnetic layer in one embodiment.

[0032] Figure 7 A printed circuit board assembly of a pedal travel sensor according to another embodiment of the present invention is shown. DETAILED DESCRIPTION

[0033] The pedal travel sensor and the braking system of the present invention will be further explained and illustrated below in conjunction with the accompanying drawings and specific embodiments of the specification. However, such explanation and illustration do not constitute an undue limitation on the technical solution of the present invention.

[0034] The pedal travel sensor is an essential component of the brake pedal module in an electric brake system. Its primary function is to convert pedal displacement into a PWM position signal, which is transmitted to the electric brake system's Brake Control Unit (BCU) for brake control. However, current pedal travel sensors have a complex structure, resulting in high design, verification, and manufacturing costs.

[0035] In order to solve the above problems, the present invention proposes, in one embodiment, a pedal stroke sensor with a simple structure, high integration and accurate sensing.

[0036] Figure 1 A schematic diagram of the external structure of the pedal stroke sensor described in the present invention in one embodiment is shown.

[0037] Figure 2 A cross-sectional view of a pedal travel sensor according to the present invention is shown in one embodiment.

[0038] Figure 3The housing is hidden and the three-dimensional structure of the sliding body and the printed circuit board assembly of the pedal stroke sensor according to one embodiment of the present invention is shown.

[0039] In some embodiments, as Figure 1 、 Figure 2 and Figure 3 As shown, the pedal stroke sensor may include a fixed housing 1; a sliding body 2 associated with the movement of the pedal, which is movably arranged in the housing 1, for example, Figure 2 The P direction shown in FIG 1 is a schematic diagram of a device that moves up and down relative to the housing; a magnetic element 3 is integrally formed with the slider 2; and a fixed printed circuit board assembly 4 includes at least a printed circuit board 41. The printed circuit board 41 responds to the changes in the magnetic field generated by the magnetic element 3 as the slider 2 moves, thereby converting the movement of the slider 2 into an electrical signal for output. Because the sliding motion of the slider is associated with the brake system's pedal, this electrical signal (e.g., a PWM position signal) can represent the brake pedal travel. This electrical signal is then transmitted to the electric brake system's BCU, thereby achieving brake control.

[0040] Thus, the present invention integrates the magnetic element 3 on the slider 2, eliminating the need for additional moving parts to assist the movement of the magnetic element. As the slider 2 moves up and down, the magnetic element 3 also moves in exact synchronization, significantly streamlining the structural design. Furthermore, the magnetic element's travel fully reflects the slider's travel without any motion loss or instability. This further enhances the precision and accuracy of the electrical signals output by the printed circuit board.

[0041] In some specific examples, the pedal stroke sensor may sense a stroke range of 0 to 10 mm.

[0042] It should be noted that the term "magnetic element integrally provided with the sliding body" as used in this utility model means that the magnetic element and the sliding body form a single integral component, rather than being separate components connected via a connecting element. Alternatively, it can be understood that the magnetic element constitutes a part of the sliding body. For example, in some embodiments, the outer wall of the sliding body may be provided with a groove, and a magnetic element, such as a button-shaped magnet, may be embedded in the groove, thereby forming an integral part of the sliding body.

[0043] However, in some more preferred embodiments, as Figure 4 As shown, the magnetic element is provided as a magnetic layer 31 integrated on the outer wall of the sliding body. That is, in this embodiment, the magnetic element is constructed as a layered structural element wrapped or adhered to the outer wall of the sliding body 2, thereby forming a part of the outer wall of the sliding body.

[0044] like Figure 4 As shown, in some more specific embodiments, the magnetic layer 31 is annularly disposed along the circumference of the slider, thereby forming a magnetic ring. In this embodiment, since the magnetic layer is provided along the entire circumferential wall of the slider, the positional relationship between the slider and the printed circuit board does not need to be overly considered during assembly, as the printed circuit board can always sense the changes in the magnetic field generated by the movement of the slider.

[0045] In other embodiments, Figure 5 As shown, the magnetic layer 31 can also be provided in a block shape corresponding to the position of the printed circuit board assembly, that is, it does not cover the entire circumference of the slider. This arrangement is less expensive than providing a circle of magnetic layer along the circumference of the slider.

[0046] Of course, in some other embodiments, the magnetic element or magnetic layer may also be in other shapes, such as a circle.

[0047] In some more specific embodiments, Figure 6 As shown, the outer wall of the sliding body 2 is provided with a groove 21, such as a circumferential groove, and the magnetic layer 31 is provided in the groove 21, and as shown in FIG. Figure 4 As shown, the outer surface of the magnetic layer 31 is flush with the outer wall of the slider. That is, the magnetic layer 31 neither protrudes nor recesses relative to the outer wall of the slider. This flush arrangement allows the magnetic layer to become part of the outer wall of the slider in terms of structure and shape, thus simplifying the integrated structure. Furthermore, the walls of the groove provide a positional constraint for the magnetic layer 31, further enhancing its stability.

[0048] like Figure 5 As shown, a block-shaped magnetic layer 31 can also be disposed in such a groove 21 , and the outer surface of the magnetic layer 31 is flush with the outer wall surface of the sliding body.

[0049] Of course, in some other optional embodiments, the outer surface of the magnetic layer 31 can also be set to be flush with the outer wall surface of the sliding body, that is, the magnetic layer 31 protrudes from the outer surface of the sliding body, or is recessed into the outer surface of the sliding body.

[0050] In some more specific embodiments, the magnetic layer 31 may be formed on the outer wall of the sliding body through a coating process.

[0051] In some other more specific embodiments, the magnetic layer 31 may also be attached to the outer wall of the sliding body by gluing.

[0052] In some embodiments, the magnetic element may be a neodymium iron boron magnet, in other embodiments, the magnetic element may be ferrite, or in still other embodiments, the magnetic element may be magnetic rubber. Of course, in other embodiments, the magnetic element may also be a mixture of these materials.

[0053] Figure 7 A printed circuit board assembly of a pedal travel sensor according to another embodiment of the present invention is shown.

[0054] like Figure 7 As shown, the printed circuit board assembly 4 includes a housing 42 and a printed circuit board (PCBA) 41 disposed in the housing. In this embodiment, the housing 42 can provide protection for the printed circuit board 41, and the printed circuit board 41 can be fixedly disposed by the housing 42.

[0055] like Figure 1 and Figure 2 As shown, the housing 42 is fixedly connected to the outer shell 1, for example, by bolts 43, thereby securing the printed circuit board 41. The printed circuit board 41 is positioned within the housing 42 via positioning pins 421 extending from the housing 42. The printed circuit board 41 is provided with an ASIC chip 411 including a Hall element, a transmission circuit, and pins 412. Pins 412 can be electrically connected to a connector (not shown) of an external braking system.

[0056] Based on the above setting, when the sliding body 2 associated with the pedal moves in the P direction, the magnetic element 3 also moves synchronously relative to the printed circuit board 41. As a result, the printed circuit board 41 will sense the changes in the magnetic field generated by the magnetic element 3 as the sliding body moves, thereby converting the movement amount of the sliding body representing the brake pedal stroke or movement amount into an electrical signal (such as a PWM position signal), which is output to the connector through pin 412 and then transmitted to the BCU of the electric brake system, thereby realizing braking control.

[0057] like Figure 2 As shown, in some more specific embodiments, a sealing groove 44 may be further provided on the connecting end surface where the shell 42 is connected to the outer shell 1, and a sealing element 5 is provided in the sealing groove 44, thereby realizing a sealed connection between the shell 42 and the outer shell 1, preventing dust or water vapor from entering the shell, thereby providing better protection for the printed circuit board 41 in the shell 42.

[0058] In another embodiment, the present invention further provides a braking system, which includes the pedal travel sensor as described above.

[0059] Since the present invention does not involve improvements to other components of the brake system, the braking process of the brake system will not be described in detail here.

[0060] The pedal stroke sensor has simple structure, high integration, accurate sensing result and good adaptability, and can be widely used in various electronic brake systems.

[0061] It should be noted that the prior art part in the protection scope of the utility model is not limited to the embodiments given in the utility model document, all prior art not contradictory to the scheme of the utility model, including but not limited to prior patent documents, prior published publications, prior public use, etc., can be included in the protection scope of the utility model.

[0062] In addition, the combination mode of each technical feature in the case is not limited to the combination mode recorded in the claims of the case or the combination mode recorded in the specific embodiments, all technical features recorded in the case can be freely combined or combined in any mode, unless contradictory to each other.

[0063] It should be noted that the above-mentioned embodiments are only specific embodiments of the utility model. Obviously, the utility model is not limited to the above-mentioned embodiments, and similar changes or deformations made according to the contents disclosed in the utility model are directly derived or easily thought by those skilled in the art, which should belong to the protection scope of the utility model.

Claims

1. A pedal travel sensor, characterized in that: include: A fixedly set housing; a sliding body, which is associated with the movement of the pedal, and the sliding body is movably disposed in the housing; a magnetic element integrally provided with the sliding body; The fixed printed circuit board assembly comprises at least a printed circuit board, which responds to the change of the magnetic field generated by the magnetic element as the sliding body moves, so as to convert the movement of the sliding body into an electrical signal output.

2. The pedal travel sensor according to claim 1, wherein: The magnetic element is configured as a magnetic layer integrated on the outer wall of the sliding body.

3. The pedal travel sensor according to claim 2, wherein: The magnetic layer is provided in an annular shape along the circumferential direction of the sliding body.

4. The pedal travel sensor according to claim 2, wherein: The magnetic layer is arranged in a block shape corresponding to the position of the printed circuit board assembly.

5. The pedal travel sensor according to claim 2, wherein: The outer wall of the sliding body is provided with a groove, and the magnetic layer is arranged in the groove.

6. The pedal travel sensor according to claim 5, wherein: The magnetic layer is clamped in the groove in an interference fit manner.

7. The pedal travel sensor according to claim 2, wherein: The magnetic layer is formed on the outer wall of the sliding body through a coating process, or the magnetic layer is adhered to the outer wall of the sliding body.

8. The pedal travel sensor according to claim 2, wherein: The magnetic element includes at least one of a neodymium iron boron magnet, ferrite or magnetic rubber.

9. The pedal travel sensor according to claim 1, wherein: The printed circuit board assembly further includes a shell, which is fixedly connected to the housing, and the printed circuit board is arranged in the housing.

10. The pedal travel sensor according to claim 9, wherein: A sealing groove is provided on the connection end surface where the shell and the outer shell are connected, and a sealing element is provided in the sealing groove.

11. A braking system, characterized in that: It includes the pedal travel sensor according to any one of claims 1 to 10.

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