Clamp braking force feedback device, brake calipers and automobile

Abstract

The utility model discloses a clamp braking force feedback device, brake calipers and an automobile, and the clamp braking force feedback device comprises a braking component which comprises a back plate and a friction plate, the back plate is used for being connected with the brake calipers, and the friction plate is installed on the back plate; the pressure sensor is installed on the back plate, the pressure sensor abuts against the friction plate, the pressure sensor is used for detecting the tangential braking force of the friction plate, and the pressure sensor is used for being electrically connected with a vehicle control unit. In the embodiment of the invention, the pressure sensor converts the stress strain generated during braking of the friction plate into the electric signal and outputs the electric signal to the vehicle control unit, so that the tangential braking force of the brake calipers in the vehicle braking process is measured in real time, and the control precision of the braking force is improved. The pressure sensor can measure the braking force in real time, and timely judgment and response measures can be conveniently taken for the abnormal state of vehicle braking.

Description

Technical Field

[0001] The present application relates to the technical field of wire-controlled chassis, and in particular to a caliper braking force feedback device, a brake caliper and a car. Background Art

[0002] In the related technology, the existing technology uses electric motors to apply thrust to replace the traditional hydraulic pressure, but it is unable to accurately control the braking force and cannot meet the requirements of accurate and rapid response of braking control related functions to the braking force responsiveness.

[0003] The existing technology provides an electronically controlled brake caliper assembly that integrates the MGU and ECU on the brake caliper assembly to improve the response speed of the system, but the brake pads still use the traditional style. Traditional brake pads cannot maintain stability when the friction coefficient is affected by multiple factors such as ambient temperature, humidity, speed, etc., so the braking force displayed by the actual vehicle will change with the change of the friction coefficient, resulting in uncontrollable braking force of the vehicle. At the same time, when the brake assist system intervenes under extreme conditions, it will be difficult to maintain the balance of the left and right braking forces, which poses a risk of causing the vehicle to sway or even tailspin. In addition, when the brake pads work for a long time and at high intensity, thermal decay will occur, and the braking force will drop significantly. Due to the inability to provide feedback on the actual braking force, the existing technical system cannot accurately determine the time when this dangerous situation occurs, and thus cannot respond in time. Utility Model Content

[0004] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a caliper braking force feedback device, a brake caliper and a vehicle, which can monitor and feedback the braking force of the actual vehicle, thereby improving the accuracy of the braking force.

[0005] According to an embodiment of the present application, a caliper braking force feedback device includes:

[0006] A brake component, comprising a back plate and a friction plate, wherein the back plate is used to be connected to the brake caliper, and the friction plate is mounted on the back plate;

[0007] A pressure sensor is installed on the back plate and abuts against the friction plate. The pressure sensor is used to detect the tangential braking force of the friction plate. The pressure sensor is used to be electrically connected to a vehicle controller.

[0008] According to the caliper braking force feedback device of the embodiment of the present application, the pressure sensor is a piezoelectric pressure sensor.

[0009] According to the caliper braking force feedback device of the embodiment of the present application, the pressure sensor includes a shell, a diaphragm, a disc, a crystal and a lead. The shell is installed on the back plate. The shell has a accommodating cavity inside. The diaphragm, the disc and the crystal are arranged in the accommodating cavity in sequence, and the diaphragm is abutted against the shell. One end of the lead is connected to the crystal, and the other end of the lead is used to be electrically connected to the vehicle controller.

[0010] According to the caliper braking force feedback device of the embodiment of the present application, the friction plate is connected to the back plate by crimping.

[0011] According to the caliper braking force feedback device of the embodiment of the present application, it also includes a fastener, the piezoelectric sensor has a connecting portion, the back plate is provided with a mounting hole, and the connecting portion is inserted into the mounting hole and then threadedly connected to the fastener.

[0012] According to the caliper braking force feedback device of the embodiment of the present application, the diameter of the mounting hole is smaller than the diameter of the circumscribed circle of the housing.

[0013] According to the caliper braking force feedback device of the embodiment of the present application, the distance between the bottom of the pressure sensor and the end surface of the friction plate away from the back plate is h, where h>0.

[0014] According to the caliper braking force feedback device of the embodiment of the present application, the back plate is provided with a fixing groove matching the pressure sensor, and the pressure sensor is installed in the fixing groove, wherein one side of the pressure sensor is connected to the outside.

[0015] A brake caliper according to another embodiment of the present application includes the caliper braking force feedback device as described above.

[0016] A car according to another embodiment of the present application includes the brake caliper as described above.

[0017] The caliper braking force feedback device, brake caliper and automobile according to the embodiment of the present application have at least the following beneficial effects: when the brake caliper brakes, the friction plate is subjected to the tangential braking force and generates stress and strain, which is received by the pressure sensor installed on the back plate and abutting against the friction plate. The pressure sensor converts the stress and strain into an electrical signal and outputs it to the vehicle controller, thereby achieving real-time measurement of the tangential braking force of the brake caliper during vehicle braking, which helps to improve the control accuracy of the braking force. The pressure sensor can measure the braking force in real time, which is convenient for timely judgment and response measures for abnormal braking status of the vehicle.

[0018] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present application is further described below with reference to the accompanying drawings and embodiments, wherein:

[0020] Figure 1 This is a structural schematic diagram of a caliper braking force feedback device according to an embodiment of the present application;

[0021] Figure 2 This is a schematic diagram of an exploded structure of a caliper braking force feedback device according to an embodiment of the present application;

[0022] Figure 3 This is a schematic cross-sectional structural diagram of a pressure sensor in one embodiment of the present application;

[0023] Figure 4 A schematic structural diagram of a caliper braking force feedback device according to an embodiment of the present application;

[0024] Figure 5 for Figure 4 Schematic diagram of the cross-sectional structure of AA.

[0025] Reference numerals:

[0026] 110, back plate; 111, mounting hole; 120, friction plate; 121, fixing groove;

[0027] 200, pressure sensor; 210, connecting part; 220, lead wire; 230, housing; 231, accommodating cavity; 240, diaphragm; 250, disk; 260, crystal;

[0028] 300. Fasteners. DETAILED DESCRIPTION

[0029] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0030] In the description of the present application, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0031] In the description of this application, "several" means more than one, "more" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0032] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.

[0033] In the description of the present application, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0034] In related technologies, with the continuous development of electronically controlled chassis technology, the demand for electronic and electronically controlled brake calipers, as the direct acting components for vehicle braking operations, is a future development trend. The biggest benefit of electronic brake calipers is that they can directly control the movement of the brake calipers electronically to meet the needs of autonomous driving, while shortening the reaction time of the braking process. The construction of the electronic brake caliper system, the monitoring and feedback of the braking force will be an extremely important part.

[0035] In the related art, the electronically controlled brake caliper assembly includes: MGU, ECU and brake caliper assembly; ECU and MGU are integrated; MGU is connected to the brake caliper assembly; ECU is arranged on the side of MGU away from the center of the wheel rim. Among them, MGU, ECU and brake caliper assembly adopt an integrated design to make the overall structure of the caliper assembly more compact and easy to arrange in the wheel rim. Through the integrated design, the MGU and ECU are integrated into the brake caliper assembly, which is more conducive to improving the response speed of the system and improving the reliability of the system; in addition, the utility model limits the layout position of the ECU, so that the ECU is arranged on the side of the brake caliper body away from the drive shaft, so that when the car is turning, when the wheel swings to the extreme position around the Z axis of the vehicle coordinate system, the brake caliper and the drive shaft will not interfere with each other.

[0036] In the above scheme, the brake pads still use the traditional style. The traditional brake pads cannot maintain stability when the friction coefficient is affected by various factors such as ambient temperature, humidity, speed, etc., so the braking force shown by the actual vehicle will change with the change of the friction coefficient, resulting in uncontrollable braking force of the vehicle. At the same time, when the brake assist system intervenes under extreme working conditions, it will be difficult to maintain the balance of the left and right braking forces, which may cause the vehicle to sway or even roll over. In addition, when the brake pads work at high intensity for a long time, thermal decay will occur, and the braking force will drop significantly. Due to the inability to provide feedback on the actual braking force, the existing technical system cannot accurately determine the time when this dangerous situation occurs, and thus cannot respond in time.

[0037] Therefore, the present application proposes a caliper braking force feedback device, a brake caliper and a vehicle to effectively solve the above-mentioned problems.

[0038] See also Figures 1 to 5 In one aspect, an embodiment of the present application discloses a caliper braking force feedback device, which includes a braking component and a pressure sensor 200 .

[0039] Specifically, the braking components include a back plate 110 and a friction plate 120. The back plate 110 is used to connect to the brake caliper, and the friction plate 120 is installed on the back plate 110. The pressure sensor 200 is installed on the back plate 110, and the pressure sensor 200 abuts against the friction plate 120. The pressure sensor 200 is used to detect the tangential braking force of the friction plate 120, and the pressure sensor 200 is used to be electrically connected to the vehicle controller.

[0040] When the brake caliper brakes, the friction plate 120 is subjected to the tangential braking force and generates stress and strain, which is received by the pressure sensor 200 installed on the back plate and abutting against the friction plate 120. The pressure sensor 200 converts the stress and strain into an electrical signal and outputs it to the vehicle controller, thereby achieving real-time measurement of the tangential braking force of the brake caliper during vehicle braking, which helps to improve the control accuracy of the braking force. The pressure sensor 200 can measure the braking force in real time, which is convenient for timely judgment and response measures to abnormal vehicle braking conditions.

[0041] It is worth to understand that the pressure sensor 200 measures the tangential braking force of the brake caliper by detecting the stress and strain generated by the friction plate 120 during braking.

[0042] In some embodiments of the present application, the pressure sensor 200 is a piezoelectric pressure sensor. Specifically, during the vehicle braking process, the friction plate 120 generates a braking force by friction, and at the same time, the friction plate 120 is subjected to a tangential braking force, which causes stress and strain. This stress is received by the pressure sensor 200 embedded in the friction plate 120. The pressure sensor 200 converts the stress and strain on the friction plate 120 into an electrical signal and outputs it to the vehicle controller, thereby achieving real-time measurement of the tangential braking force of the brake caliper during the vehicle braking process, and at the same time, feeding back the real-time braking force measurement data information to the vehicle controller, so as to make timely judgments and response measures for abnormal vehicle braking conditions.

[0043] In the above embodiments, the piezoelectric pressure sensor has the characteristics of small size, good dynamic performance, high temperature resistance, etc., and is less affected by the high temperature and high pressure environment, and can improve the measurement and feedback accuracy of the caliper braking force feedback device in the high temperature and high pressure environment.

[0044] In one possible implementation, see Figure 3 The pressure sensor 200 includes a shell 230, a diaphragm 240, a disk 250, a crystal 260 and a lead 220. The shell 230 is mounted on the back plate 110. The shell 230 has a receiving cavity 231 inside. The diaphragm 240, the disk and the crystal 260 are sequentially arranged in the receiving cavity 231, and the diaphragm 240 is abutted against the shell 230. One end of the lead 220 is connected to the crystal 260, and the other end of the lead 220 is used to be electrically connected to the vehicle controller.

[0045] In this embodiment, the working principle of the piezoelectric pressure sensor is the principle of positive piezoelectric effect. Specifically, when the crystal 260 is subjected to an external force in a fixed direction, electric polarization occurs inside the crystal, and charges of opposite signs are generated on two surfaces at the same time; when the external force is removed, the crystal 260 returns to a non-charged state; when the direction of the external force changes, the polarity of the charge also changes; the amount of charge generated by the crystal 260 is proportional to the magnitude of the external force. The disc 250 and the crystal 260 are fixed on the housing 230. When the diaphragm 240 is subjected to the stress generated by the braking force, the pressure will be transmitted to the crystal 260, and then the crystal 260 will generate a charge under the action of the external force, and the electrical signal will be output to the vehicle controller through the lead 220.

[0046] In this embodiment, the piezoelectric sensor has the characteristics of small size, good dynamic characteristics, high temperature resistance, etc., and can maintain normal operation in a high temperature and high pressure environment, thereby facilitating the working accuracy of the brake assist function.

[0047] In some embodiments of the present application, the friction plate 120 is connected to the back plate 110 by crimping.

[0048] In some other embodiments, the friction plate 120 may also be fixedly connected to the back plate 110 by bonding, fastening with a fastener 300, etc., which is not limited here. Specifically, the fastener 300 may be a screw, a bolt, etc.

[0049] In some embodiments of the present application, see Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, the caliper braking force feedback device also includes a fastener 300, the piezoelectric sensor has a connecting portion 210, the back plate 110 is provided with a mounting hole 111, and the connecting portion 210 is threadedly connected with the fastener 300 after being inserted into the mounting hole 111. Specifically, the outer periphery of the connecting portion 210 is provided with an external thread, and the fastener 300 can be specifically a nut, which is threadedly connected with the connecting portion 210. During assembly, the connecting portion 210 is inserted into the mounting hole 111 of the back plate 110 and at least partially extends out of the mounting hole 111, and then the fastener 300 is threadedly connected with the connecting portion 210, so that the pressure sensor 200 can be installed on the back plate 110.

[0050] In the above embodiment, the piezoelectric sensor can be removed from the brake component. When the friction plate 120 needs to be replaced, there is no need to replace the pressure sensor 200, which prolongs the service life of the pressure sensor 200 and helps reduce costs.

[0051] It is worth noting that in the above embodiment, the diameter of the mounting hole 111 is smaller than the diameter of the circumscribed circle of the housing 230. Figure 5 As shown, the hole wall of the mounting hole 111 can be at least partially stuck between the fastener 300 and the housing 230 to improve the installation reliability of the pressure sensor 200.

[0052] In some embodiments of the present application, see Figure 5 , the distance between the bottom of the pressure sensor 200 and the end surface of the friction plate 120 away from the back plate 110 is h, where h>0. In this way, there is a certain interval between the bottom of the pressure sensor 200 and the end surface of the friction plate 120 away from the back plate 110. It is worth understanding that the end surface of the friction plate 120 away from the back plate 110 is used to abut against the brake caliper. Among them, the end surface of the friction plate 120 away from the back plate 110 is a friction surface for abutting against the brake caliper. During use, as the friction plate 120 and the brake caliper rub, the friction plate 120 will be worn, that is, the distance h between the bottom of the pressure sensor 200 and the end surface of the friction plate 120 away from the back plate 110 will decrease. In the embodiment of the present application, by setting a certain interval between the bottom of the pressure sensor 200 and the friction surface, it is avoided that the bottom of the pressure sensor 200 is directly in contact with the brake caliper after the friction plate 120 is worn, which causes the pressure sensor 200 to be damaged, which is beneficial to protect the pressure sensor 200 and helps to extend its service life.

[0053] In some embodiments of the present application, see Figures 1 to 5 As shown, the back plate 110 is provided with a fixing groove 121 matching with the pressure sensor 200, the pressure sensor 200 is installed in the fixing groove 121, and one side of the pressure sensor 200 is connected to the outside. The shape and size of the fixing groove 121 match the pressure sensor 200. In this way, the pressure sensor 200 can be exactly installed in the fixing groove 121, and the pressure sensor 200 can be kept in contact with the friction plate 120, thereby ensuring the working accuracy and sensitivity of the pressure sensor 200.

[0054] On the other hand, the embodiment of the present application discloses a brake caliper, including a brake caliper body and a caliper braking force feedback device as described above, wherein the back plate 110 of the caliper braking force feedback device is in contact with the brake caliper body. During braking, the friction plate abuts against the brake disc to achieve braking. During the braking process, a pressure sensor 200 is provided on the braking component, and the pressure sensor 200 can measure the tangential braking force of the brake caliper in real time, and feed back the braking force measurement data information to the vehicle controller, so as to make timely judgments and response measures for abnormal braking conditions of the vehicle. At the same time, the pressure sensor 200 can measure the braking force in real time, which helps to improve the working accuracy of the brake assist function.

[0055] In another aspect, an embodiment of the present application discloses a car, including the brake caliper as described above, having all the technical effects of the aforementioned brake caliper, which will not be repeated here.

[0056] The embodiments of the present application are described in detail above in conjunction with the accompanying drawings, but the present application is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the purpose of the present application. In addition, the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

Claims

1. A caliper braking force feedback device, characterized in that: include: A brake component, comprising a back plate and a friction plate, wherein the back plate is used to be connected to the brake caliper, and the friction plate is mounted on the back plate; A pressure sensor is installed on the back plate and abuts against the friction plate. The pressure sensor is used to detect the tangential braking force of the friction plate. The pressure sensor is used to be electrically connected to a vehicle controller.

2. The caliper braking force feedback device according to claim 1, characterized in that: The pressure sensor is a piezoelectric pressure sensor.

3. The caliper braking force feedback device according to claim 1 or 2, characterized in that: The pressure sensor includes a shell, a diaphragm, a disc, a crystal and a lead. The shell is mounted on the back plate. The shell has a accommodating cavity inside. The diaphragm, the disc and the crystal are sequentially arranged in the accommodating cavity, and the diaphragm is in contact with the shell. One end of the lead is connected to the crystal, and the other end of the lead is used to be electrically connected to the vehicle controller.

4. The caliper braking force feedback device according to claim 3, characterized in that: It also includes a fastener. The pressure sensor has a connecting portion. The back plate is provided with a mounting hole. The connecting portion is inserted into the mounting hole and is threadedly connected to the fastener.

5. The caliper braking force feedback device according to claim 4, characterized in that: The diameter of the mounting hole is smaller than the diameter of the circumscribed circle of the housing.

6. The caliper braking force feedback device according to claim 1, characterized in that: The distance between the bottom of the pressure sensor and the end surface of the friction plate away from the back plate is h, where h>0.

7. The caliper braking force feedback device according to claim 1, characterized in that: The back plate is provided with a fixing groove matching the pressure sensor, and the pressure sensor is installed in the fixing groove, wherein one side of the pressure sensor is communicated with the outside.

8. The caliper braking force feedback device according to claim 1, characterized in that: The friction plate is connected to the back plate by crimping.

9. A brake caliper, characterized in that: It comprises a caliper braking force feedback device as claimed in any one of claims 1 to 8.

10. An automobile, characterized in that: Comprising a brake caliper as claimed in claim 9.

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