Pedal travel sensor, brake pedal assembly and brake system

Abstract

The utility model discloses a pedal travel sensor, a brake pedal assembly and a brake system, the pedal travel sensor is used for being connected with a brake pedal module, and the brake pedal module comprises a cylinder body (3) and a piston (4) capable of moving relative to the cylinder body; the pedal travel sensor comprises a magnetic assembly (1) which comprises a support (11) provided with a connecting piece (12) used for being connected with a piston; the magnetic element (13) is fixedly arranged on the bracket; the printed circuit board assembly (2) is fixedly arranged and at least comprises a printed circuit board (21), and a trigger switch (211) is arranged on the printed circuit board (21); wherein the printed circuit board (21) responds to the magnetic field change generated by the magnetic element (13) along with the movement of the piston (4), so that the movement amount of the piston is converted into an electric signal to be output; and when the magnetic assembly (1) moves to a trigger station for triggering the trigger switch (211) to be turned on, the printed circuit board (21) outputs an awakening signal for awakening the braking system.

Description

Technical Field

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

[0002] The vehicle braking system is an important part of vehicle safety, and its main function is to decelerate or stop a moving vehicle when necessary.

[0003] The braking system of modern vehicles usually includes: a brake pedal, which the driver presses to activate the braking system; and a brake control system, such as an electric braking system.

[0004] At present, the electric braking system (EBS) is more widely used in commercial vehicles. The pedal travel sensor (PTS) is an essential sensor in the EBS brake pedal module. The main function of the pedal travel sensor is to convert the pedal displacement into a PWM position signal and transmit it to the BCU of the electric braking system, thereby realizing braking control.

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

[0006] One of the purposes of the utility model is to provide a pedal travel sensor with a simple structure, high adaptability, and a split installation structure, which can accurately sense the pedal travel.

[0007] To achieve the above purpose, the utility model proposes a pedal travel sensor for connecting with a brake pedal module, where the brake pedal module includes a cylinder block and a piston capable of moving relative to the cylinder block; the pedal travel sensor includes:

[0008] A magnetic component, which includes: a bracket provided with a connecting piece for connecting with the piston to move along with the movement of the piston; a magnetic element fixedly arranged on the bracket;

[0009] A fixedly arranged printed circuit board assembly, which at least includes a printed circuit board provided with a trigger switch;

[0010] Wherein, the printed circuit board responds to the magnetic field change generated by the movement of the magnetic element along with the piston to convert the movement amount of the piston into an electrical signal for output; and when the magnetic component moves to a trigger position that triggers the opening of the trigger switch, the printed circuit board outputs a wake-up signal for waking up the braking system.

[0011] Further, in the pedal travel sensor of the present utility model, the bracket includes a first arm portion and a second arm portion perpendicular to the first arm portion. The connecting member is disposed on the first arm portion, and the magnetic element is fixedly disposed on the second arm portion.

[0012] Further, in the pedal travel sensor of the present utility model, an abutting portion is provided on the bracket such that when the magnetic assembly moves to the triggering position, the abutting portion presses against the triggering switch.

[0013] Further, in the pedal travel sensor of the present utility model, an abutting portion is provided on the second arm portion such that when the magnetic assembly moves to the triggering position where it presses the switch, the abutting portion presses against the triggering switch.

[0014] Further, in the pedal travel sensor of the present utility model, the connecting member includes a connecting bolt.

[0015] Further, in the pedal travel sensor of the present utility model, the printed circuit board assembly further includes a housing for fixedly connecting with the cylinder block, and the printed circuit board is disposed inside the housing.

[0016] Further, in the pedal travel sensor of the present utility model, a sealing groove is provided on the connecting end face of the housing, and a sealing element is disposed in the sealing groove.

[0017] Another object of the present utility model is to provide a brake pedal assembly which has a simple structure, is easy to manufacture and use, and has high adaptability.

[0018] Based on the above object, the present utility model further provides a brake pedal assembly which includes a brake pedal module. The brake pedal module includes a cylinder block and a piston capable of moving relative to the cylinder block. The brake pedal assembly further includes the pedal travel sensor as described above.

[0019] Further, in the brake pedal assembly of the present utility model, a connecting groove is provided on the piston. The connecting groove extends in the circumferential direction of the piston. The leading end of the connecting member is disposed in the connecting groove, and the trailing end of the connecting member is connected to the bracket.

[0020] The present utility model further provides a braking system which includes the pedal travel sensor as described above.

[0021] The present utility model further provides a braking system which includes the brake pedal assembly as described above.

[0022] The pedal travel sensor of the present utility model has a simple structure and high adaptability. Adopting a split installation structure, it can achieve precise sensing of the pedal travel.

[0023] The sensing process of the pedal travel sensor described in the present utility model is convenient and accurate, and it can be used in a vehicle braking system, especially an electric braking system. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Shows a three-dimensional structural schematic diagram of the magnetic component of the pedal travel sensor described in the present utility model in one embodiment.

[0025] Figure 2 Shows a three-dimensional structural schematic diagram of the printed circuit board assembly of the pedal travel sensor described in the present utility model in one embodiment.

[0026] Figure 3 Shows a three-dimensional structural schematic diagram of the magnetic element of the pedal travel sensor described in the present utility model in one embodiment.

[0027] Figure 4 Shows a three-dimensional structural schematic diagram of the brake pedal module of the brake pedal assembly described in the present utility model in one embodiment.

[0028] Figure 5 Shows the brake pedal module of the brake pedal assembly described in the present utility model in one embodiment from a top-down perspective.

[0029] Figure 6 Shows a schematic diagram of the structure of the brake pedal assembly described in the present utility model in one embodiment from a sectional perspective.

[0030] Figure 7 Shows the structure of the brake pedal assembly described in the present utility model in one embodiment from a top-down perspective. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] The following will further explain and illustrate the pedal travel sensor, brake pedal assembly, and braking system described in the present utility model in conjunction with the accompanying drawings of the specification and specific embodiments. However, this explanation and illustration shall not unduly limit the technical solution of the present utility model.

[0032] The pedal travel sensor is an essential component of the brake pedal module of an electric braking system. Its main function is to convert the pedal displacement into a PWM position signal and transmit it to the BCU (Brake Control Unit) of the electric braking system, thereby achieving braking control. However, the current pedal travel sensor has a complex structure, and the costs of its design, verification, and manufacturing are all relatively high.

[0033] To solve the above problems, in one embodiment of the present utility model, a pedal travel sensor with a simple structure and accurate sensing is proposed.

[0034] Figure 1 Shows a three-dimensional structural schematic diagram of the magnetic component of the pedal travel sensor according to the present utility model in an embodiment.

[0035] Figure 2 Shows a three-dimensional structural schematic diagram of the printed circuit board assembly of the pedal travel sensor according to the present utility model in an embodiment.

[0036] In some embodiments, the pedal travel sensor according to the present utility model is used to connect with a brake pedal module, the brake pedal module is connected to the brake pedal in an associated manner, and the brake pedal module includes a fixedly arranged cylinder block and a piston that moves relative to the cylinder block.

[0037] Among them, the pedal travel sensor may include: for example, as Figure 1 shown, a magnetic component 1, and for example, as Figure 2 shown, a printed circuit board assembly 2.

[0038] In the present utility model, the magnetic component 1 and the printed circuit board assembly 2 are separately installed, and they are respectively used to be installed on the piston and the cylinder block of the brake pedal module. That is to say, the printed circuit board assembly 2 is fixedly arranged, while the magnetic component 1 is movably arranged.

[0039] In some embodiments, the magnetic component 1 includes: a bracket 11, on which a connecting member 12 is provided, and the connecting member 12 is used to connect with the piston to move along with the movement of the piston; a magnetic element 13, such as a magnet, is fixedly arranged on the bracket 11.

[0040] In some more specific embodiments, the connecting member 12 may include a connecting bolt.

[0041] In some other more specific embodiments, the connecting member 12 may also include a dowel pin, a rivet or a similar connecting member.

[0042] As Figure 1 shown, in some more specific embodiments, the connecting member 12 may be provided with at least two, so as to improve the connection stability and force balance. Of course, in other embodiments, the connecting member 12 may also be provided with one, three, four or other numbers. Those skilled in the art can set the number of connecting members according to needs.

[0043] As Figure 3 shown, in some more specific embodiments, the magnetic element 13 has two protruding wing portions 131, and holes 132 are formed on the wing portions 131. Through bolts, dowel pins, rivets or similar connecting elements passing through the holes 132, the fixed connection between the magnetic element 13 and the bracket 11 can be realized.

[0044] In some other embodiments, the magnetic element 13 can also be fixedly connected to the bracket 11 by gluing or other similar means.

[0045] As Figure 2 shown, in some embodiments, the printed circuit board assembly 2 at least includes a printed circuit board (PCBA) 21. A trigger switch 211, an ASIC chip 212 including a Hall element, a transmission circuit, and pins are provided on the printed circuit board 21. Among them, when the trigger switch 211 is triggered, the printed circuit board 21 outputs a wake-up signal for waking up a braking system, such as an electronic braking system.

[0046] Based on the above settings, when the piston associated with the brake pedal moves, it drives the bracket 11 connected thereto and the magnetic element 13 fixedly provided on the bracket 11 to move relative to the printed circuit board assembly 2. Thus, the printed circuit board 21 senses the magnetic field change generated by the movement of the magnetic element 13 as the piston moves, and thereby converts the movement amount of the piston, which represents the brake pedal stroke or movement amount, into an electrical signal (such as a PWM position signal) and outputs it, and then transmits it to the BCU of the electric braking system, thereby realizing brake control.

[0047] In addition, when the magnetic assembly 1 moves to abut against the trigger position of the trigger switch 211 to turn on the trigger switch 211, the printed circuit board 21 outputs a wake-up signal for waking up the braking system.

[0048] As Figure 2 shown, in some embodiments, the printed circuit board assembly 2 may further include a housing 22 provided outside the printed circuit board 21, so as to provide a protection function for the printed circuit board 21. And the printed circuit board 21 can be fixedly arranged through the housing 22. In this embodiment, the housing 22, such as a plastic housing, is used for fixedly connecting to the cylinder block of the brake pedal module.

[0049] In some more specific embodiments, as Figure 2 shown, a connection hole 221 is provided on the connection end face of the housing 22. The housing connector (such as a bolt, a dowel pin, a rivet) passes through the connection hole 221 to realize the fixed connection between the housing 22 and the cylinder block of the brake pedal module.

[0050] In addition, in some more specific embodiments, as Figure 2 shown, a sealing groove 222 is further provided on the connection end face of the housing 22. A sealing element can be provided in the sealing groove to realize the sealed connection between the housing 22 and the cylinder block, thereby providing better protection for the printed circuit board 21 in the housing 22.

[0051] Continue to refer to Figure 1, in some more specific embodiments, the bracket 11 of the pedal travel sensor includes a first arm portion 111 and a second arm portion 112 perpendicular to the first arm portion 111. The connecting member 12 is disposed on the first arm portion 111, and the magnetic element 13 is fixedly disposed on the second arm portion 112.

[0052] It can be seen that in this embodiment, the bracket 11 is set to an L shape, and the L-shaped bracket structure can greatly reduce the layout space of the device in a simple structural form.

[0053] In some more specific embodiments, such as Figure 1 As shown, the bracket 11 is provided with an abutting portion 113, so that when the magnetic assembly 1 moves to the triggering station where the trigger switch 211 is pressed and abutted, the trigger switch 211 is pressed and abutted through the abutting portion 113.

[0054] More specifically, when the bracket 11 is set to an L-shaped structure including a first arm portion and a second arm portion, the abutting portion 113 is disposed on the second arm portion 112.

[0055] In another embodiment of the present invention, a brake pedal assembly is further provided, which includes a brake pedal module and the pedal travel sensor as described above.

[0056] Figure 4 Shows a three-dimensional structural schematic diagram of the brake pedal module of the brake pedal assembly according to the present invention in one embodiment.

[0057] Figure 5 Shows the brake pedal module of the brake pedal assembly according to the present invention in one embodiment from a top view perspective.

[0058] Such as Figure 4 And Figure 5 As shown, in some embodiments, the brake pedal module includes a cylinder block 3 and a piston 4 that can move relative to the cylinder block, wherein the piston 4 is connected to the brake pedal in an associated manner, and the amount of movement of the piston 4 in its axial direction represents the travel or movement amount of the brake pedal.

[0059] Such as Figure 4 And Figure 5 As shown, in some more specific embodiments, an arc-shaped connecting groove 41 extending in the circumferential direction of the piston can be provided on the piston 4, and the leading end of the connecting member is disposed in the connecting groove, so as to realize the connection between the connecting member and the piston.

[0060] This embodiment makes the installation position of the bracket adjustable on the piston by providing an arc-shaped connecting groove, so that the installation position of the bracket is more flexible, and further improves the adaptability of the bracket installation.

[0061] In some more specific embodiments, such asFigure 5 As shown, at least three connecting grooves 41 can be provided on the piston 4. Of course, in other embodiments, the number of connecting grooves 41 can also be set to one, two, four or other quantities. Those skilled in the art can set the number of connecting grooves as needed.

[0062] Figure 6 The structural schematic diagram of the brake pedal assembly according to the present invention is shown in a sectional view in one embodiment.

[0063] Figure 7 The structure of the brake pedal assembly according to the present invention is shown in a top view in one embodiment.

[0064] As Figure 6 and Figure 7 shown, in some more specific embodiments, the brake pedal assembly includes: a magnetic assembly, a printed circuit board assembly, a cylinder block 3, and a piston 4 that can move relative to the cylinder block.

[0065] Among them, the cylinder block 3 has a groove extending along the axial direction P of the cylinder block, so that at least a part of the bracket 11 of the magnetic assembly can extend from outside the cylinder block into the cylinder block, and is connected to the piston 4 through a connecting member 12. Among them, the upper end of the connecting member 12 is connected to the piston 4, the lower end of the connecting member 12 is connected to the bracket 11, and a magnetic element 13 is fixedly arranged on the bracket 11. In this way, both the magnetic element 13 and the bracket 11 can move with the piston 4 in the axial direction P.

[0066] The housing 22 of the printed circuit board assembly is connected outside the cylinder block, and is preferably hermetically connected outside the cylinder block through a sealing element 5 (such as a sealing ring) provided in the sealing groove 222. The printed circuit board is arranged in the housing 22 and is located outside the cylinder block.

[0067] In this setting mode, when the piston 4 connected to the brake pedal moves downward along the axial direction P, it will drive the bracket 11 connected thereto and the magnetic element 13 fixedly arranged on the bracket 11 to move relative to the printed circuit board assembly, especially relative to the printed circuit board in the housing 22. Thereby, the printed circuit board will sense the magnetic field change generated by the movement of the magnetic element 13 with the movement of the piston 4, and convert the movement amount of the piston representing the brake pedal stroke or movement amount into an electrical signal (such as a PWM position signal) for output, and then transmit it to the BCU of the electric braking system, so as to achieve braking control. In addition, as Figure 7 shown, when the bracket 11 of the magnetic assembly moves downward along the axial direction P with the piston 4 to the triggering position where the abutting portion 113 abuts and presses the trigger switch 211, the printed circuit board will also send a wake-up signal to wake up the braking system to the braking system.

[0068] In another embodiment, the present invention further provides a braking system, which includes the pedal travel sensor or the brake pedal assembly as described above.

[0069] Since the utility model does not involve improvements to the pedal assembly and other components of the brake system, the braking process of the pedal assembly and the brake system will not be described in detail herein.

[0070] The pedal stroke sensor of the utility model has a simple structure, accurate sensing results, high adaptability, and can be widely used in various electronic brake systems.

[0071] 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 documents. All prior art that does not contradict the scheme of the utility model, including but not limited to prior patent documents, prior public publications, prior public uses, etc., can be included in the protection scope of the utility model.

[0072] In addition, the combination of the various technical features in this case is not limited to the combination described in the claims of this case or the combination described in the specific embodiments. All technical features recorded in this case can be freely combined or combined in any way unless there is a contradiction between them.

[0073] It should also be noted that the above-listed embodiments are only specific embodiments of the present invention. Obviously, the present invention is not limited to the above embodiments, and similar changes or modifications made therewith are directly derived or easily associated with the contents disclosed by those skilled in the art from the present invention, and should all fall within the protection scope of the present invention.

Claims

1. A pedal travel sensor, used for connecting to a brake pedal module, wherein the brake pedal module comprises a cylinder (3) and a piston (4) movable relative to the cylinder; characterized in that: The pedal travel sensor comprises: A magnetic assembly (1) comprises: a bracket (11) on which a connecting piece (12) is provided, the connecting piece being used to be connected to the piston so as to move along with the movement of the piston; and a magnetic element (13) fixedly arranged on the bracket; A fixedly arranged printed circuit board assembly (2), comprising at least a printed circuit board (21), wherein a trigger switch (211) is provided on the printed circuit board; The printed circuit board (21) responds to the change in the magnetic field generated by the magnetic element (13) as the piston (4) moves, so as to convert the movement of the piston into an electrical signal output; and when the magnetic component (1) moves to a trigger position that triggers the trigger switch (211) to turn on, the printed circuit board (21) outputs a wake-up signal for waking up the brake system.

2. The pedal travel sensor according to claim 1, characterized in that: The bracket (11) comprises a first arm portion (111) and a second arm portion (112) perpendicular to the first arm portion, the connecting member is arranged on the first arm portion, and the magnetic element is fixedly arranged on the second arm portion.

3. The pedal travel sensor according to claim 1, characterized in that: The bracket (11) is provided with a supporting portion (113) so that when the magnetic component moves to the triggering position, the supporting portion presses against the triggering switch (211).

4. The pedal travel sensor according to claim 2, characterized in that: The second arm portion (112) is provided with a supporting portion (113) so that when the magnetic component moves to a triggering position for pressing the switch, the supporting portion presses against the trigger switch (211).

5. The pedal travel sensor according to claim 1, characterized in that: The connecting member (12) comprises a connecting bolt.

6. The pedal travel sensor according to claim 1, characterized in that: The printed circuit board assembly also includes a housing (22) which is used for being fixedly connected to the cylinder body (3), and the printed circuit board is arranged in the housing.

7. The pedal travel sensor according to claim 6, characterized in that: A sealing groove (222) is provided on the connecting end surface of the housing (22), and a sealing element (5) is provided in the sealing groove.

8. A brake pedal assembly, comprising a brake pedal module, wherein the brake pedal module comprises a cylinder (3) and a piston (4) movable relative to the cylinder; characterized in that: The brake pedal assembly further comprises a pedal travel sensor as claimed in any one of claims 1-7.

9. The brake pedal assembly according to claim 8, characterized in that The piston (4) is provided with a connecting groove (41), which extends in the circumferential direction of the piston. The head end of the connecting member (12) is arranged in the connecting groove, and the tail end of the connecting member is connected to the bracket (11).

10. A braking system, characterized in that: It comprises a pedal travel sensor as claimed in any one of claims 1 to 7.

11. A braking system, characterized in that: It comprises a brake pedal assembly as claimed in claim 8 or 9.

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