Vehicle friction plate wear detection system and detection method

Abstract

The invention provides a vehicle friction plate wear detection system and method, the vehicle friction plate wear detection system comprises a driver operation interface, a brake controller and electromechanical brake modules respectively installed at wheel edge positions, and each electromechanical brake module comprises a brake caliper body, a brake disc, a friction plate, a brake driving mechanism and a brake controller. The friction plates are arranged on the two sides of the brake disc, the brake controller is connected with the brake driving mechanism, a reciprocating execution assembly is arranged in the brake caliper body and is close to the friction plates located on the inner side, and the other end of the reciprocating execution assembly is connected with the brake driving mechanism. According to the brake-by-wire system based on the four-wheel electromechanical brake module, four-wheel friction plate abrasion loss information can be obtained based on sensor information of the system, additional friction plate abrasion detection components do not need to be added, accurate friction plate abrasion information can be provided for a driver, the vehicle maintenance convenience is improved, and the vehicle use experience is improved.

Description

Technical Field

[0001] This invention relates to the field of automotive braking technology, and in particular to a vehicle friction pad wear detection system and method. Background Technology

[0002] Conventional electronic brake pad wear detection involves installing electronic components on the brake pads that wear down along with the pads. This method has drawbacks such as high cost and difficulty in replacement. Furthermore, during maintenance, the wear level of the brake pads on each of the four wheels needs to be reset to zero, which is inconvenient. Summary of the Invention

[0003] The purpose of this invention is to provide a vehicle friction pad wear detection system and method, which can provide drivers with accurate friction pad wear information, improve the convenience of vehicle maintenance, and enhance the user experience.

[0004] According to one objective of the present invention, a vehicle friction pad wear detection system is provided, comprising a driver operating interface, a brake controller, and electromechanical brake modules respectively installed at the wheel edges of the four wheels of the vehicle. The driver operating interface and the brake controller are connected by a wiring harness, and the brake controller and the electromechanical brake modules are connected by a wiring harness.

[0005] The electromechanical brake module includes a brake caliper body, a brake disc, friction pads, a brake drive mechanism, and a brake controller. The friction pads are disposed on both sides of the brake disc. The brake controller is connected to the brake drive mechanism. A reciprocating actuation component is provided inside the brake caliper body. The reciprocating actuation component is close to the friction pads located on the inner side. The other end of the reciprocating actuation component is connected to the brake drive mechanism.

[0006] Furthermore, the reciprocating actuator includes a piston assembly, a lead screw assembly, and a lead screw assembly disposed inside the brake caliper body. The lead screw assembly is helically sleeved on the outside of the lead screw assembly, and the lead screw assembly is connected to the brake drive mechanism.

[0007] Furthermore, the brake drive mechanism drives the lead screw assembly to rotate, and the lead screw nut assembly moves linearly in both directions along the axial direction of the lead screw assembly.

[0008] Furthermore, a needle roller bearing assembly is provided between the lead screw assembly and the inner end face of the brake caliper body.

[0009] Furthermore, the brake drive mechanism includes a motor that generates power and a transmission device, and the brake drive mechanism also includes a sensor that measures the rotation angle of the motor output shaft.

[0010] Furthermore, the nut assembly moves toward the friction pad closer to the inside, the piston assembly is in contact with the friction pad located on the inside, and when the friction pad applies braking force to the brake disc exceeding a set threshold, this state is the initial clamping state of the brake.

[0011] Furthermore, the end of the lead screw assembly near the needle roller bearing assembly has a first protrusion structure, and the end of the lead screw assembly near the lead screw assembly has a second protrusion structure. The lead screw assembly moves away from the friction plate along the axial direction of the lead screw assembly. When the first protrusion structure contacts the second protrusion structure, a reaction force is generated to prevent the lead screw assembly from rotating. This state is the fully released state.

[0012] Furthermore, when the friction pad and the brake disc are in a critical state of engagement and disengagement, the nut assembly and the piston assembly generate an initial set gap, that is, when the piston assembly and the friction pad generate a set gap, this state is the normal release state.

[0013] According to another objective of the present invention, the present invention provides a detection method for the above-mentioned vehicle friction pad wear detection system, comprising the following steps:

[0014] S10: Click to view friction pad wear information on the driver's operating interface and send the detection command to the brake controller;

[0015] S20: After receiving the detection command, the brake controller judges the vehicle status. When the detection conditions are met, the brake controller will enter the diagnostic mode.

[0016] S30: After entering the diagnostic mode, the brake controller sends a friction pad wear detection command to the brake controller;

[0017] S40: The brake controller controls the brake drive mechanism to reach the initial clamping state. After the initial clamping state is completed, the brake controller controls the brake drive mechanism to reach the fully released state.

[0018] S50: After the brake controller completes the calculation of the friction pad wear, it will control the brake drive mechanism to operate in a normal release state and feed back the normal release state to the brake controller.

[0019] S60: The brake controller exits the diagnostic mode based on the status feedback from the brake controller;

[0020] S70: The brake controller processes the friction pad wear information and sends it to the driver's operating interface for display to the driver.

[0021] Further, in S40, the calculation of the friction pad wear includes the following steps: the brake controller calculates the rotation angle of the motor output shaft when the brake moves from the initial clamping state to the fully released state, and converts it into the linear motion distance S of the nut assembly. When the brake is shipped in a brand new state, the linear motion distance S0 of the nut assembly converted under the same process is stored in the brake controller. The brake controller counts (S-S0) / 2 as the friction pad wear.

[0022] This invention relates to a brake-by-wire system based on a four-wheel electromechanical braking module. It can obtain information on the wear of the four-wheel friction pads based on the system's own sensor data, eliminating the need for additional friction pad wear detection components. This offers advantages such as simple maintenance and low cost. This invention provides drivers with accurate friction pad wear information, improving vehicle maintenance convenience and enhancing the user experience. Attached Figure Description

[0023] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of the internal structure of the electromechanical brake according to an embodiment of the present invention;

[0026] Figure 3 This is a schematic diagram of the clamping state structure of the electromechanical brake according to an embodiment of the present invention;

[0027] Figure 4 This is a schematic diagram of the electromechanical brake in its fully released state according to an embodiment of the present invention;

[0028] Figure 5 This is a schematic diagram of the electromechanical brake in its normal release state according to an embodiment of the present invention;

[0029] Figure 6 This is a flowchart illustrating the vehicle friction pad wear detection process according to an embodiment of the present invention.

[0030] In the diagram: 1. Driver's operating interface; 2. First wiring harness; 3. Brake controller; 4. Second wiring harness;

[0031] 5. Electromechanical brake module; 501. Brake caliper body; 502. Brake disc; 503. Inner friction plate; 504. Brake drive mechanism; 505. Brake controller; 506. Piston assembly; 507. Lead screw assembly; 508. First protrusion structure; 509. Lead screw assembly; 510. Second protrusion structure; 511. Needle roller bearing assembly; 512. Snap ring; 513. Outer friction plate. Detailed Implementation

[0032] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they may refer to a fixed connection, a detachable connection, or an integral connection; they may refer to a mechanical connection or an electrical connection; they may refer to a direct connection or an indirect connection through an intermediate medium; and they may refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0035] Example 1

[0036] like Figure 1 As shown,

[0037] A vehicle friction pad wear detection system mainly includes a driver operation interface 1, a brake controller 3, a first wiring harness 2 connecting the driver operation interface 1 and the brake controller 3, and electromechanical brake modules 5 respectively installed at the left front, right front, left rear and right rear wheel positions of the vehicle. The brake controller 3 is connected to the electromechanical brake modules 5 installed on each wheel through a second wiring harness 4.

[0038] The electromechanical brake module 5 mainly includes a brake caliper 501, a brake disc 502, an inner friction pad 503, an outer friction pad 513, a brake drive mechanism 504, and a brake controller 505. The brake disc 502 is fixedly connected to the vehicle wheel. The inner friction pad 503 is located on the inner side of the brake disc 502, and the outer friction pad 513 is located on the outer side of the brake disc 502.

[0039] like Figure 2 As shown, the brake caliper body 501 contains a piston assembly 506, a lead screw assembly 507, a lead screw assembly 509, and a needle roller bearing assembly 511. The piston assembly 506 presses against the inner friction plate 503, causing the inner friction plate 503 to contact the brake disc 502. The lead screw assembly 507 is helically sleeved on the outside of the lead screw assembly 509 and can move back and forth along the lead screw assembly 509. The lead screw assembly 509 is connected to the brake drive mechanism 504. The needle roller bearing assembly 511 is disposed between the lead screw assembly 509 and the inner end face of the brake caliper body 501.

[0040] The brake drive mechanism 504 includes a motor that generates power and necessary transmission devices, as well as a sensor that measures the rotation angle of the motor output shaft. The brake controller 505 controls the brake drive mechanism 504 to generate power, which is then transmitted to the lead screw assembly 509 to produce rotational motion.

[0041] A retaining ring 512 is provided on one side of the lead screw assembly 507. The retaining ring 512 is fitted onto one side of the lead screw assembly 507 and is engaged in a groove inside the piston assembly 506. This feature restricts the relative positional change of the lead screw assembly 507 and the piston assembly 506 in the axial direction. This prevents the lead screw assembly 507 from rotating due to the restriction of the retaining ring 512 and the groove, thereby allowing the lead screw assembly 507 to move linearly in both directions along the axial direction of the lead screw assembly 509.

[0042] like Figure 3 As shown, when the nut assembly 507 moves toward the inner friction plate 503 and comes into contact with the piston assembly 506, causing the piston assembly 506 to come into contact with the inner friction plate 503 and causing the inner friction plate 503 to apply a custom force to the brake disc 502, this state is defined as the initial clamping state of the brake.

[0043] like Figure 4As shown, the end of the lead screw assembly 507 near the needle roller bearing assembly 511 has a first protrusion structure 508, and the end of the lead screw assembly 509 near the lead screw assembly 507 has a second protrusion structure 510. The lead screw assembly 507 moves away from the inner friction plate 503 along the axial direction of the lead screw assembly 509. When the first protrusion structure 508 of the lead screw comes into contact with the second protrusion structure 510 on the lead screw assembly 509, a reaction force that prevents the lead screw assembly 509 from rotating will be generated. This state is defined as the fully released state.

[0044] like Figure 5 As shown, when the internal friction pad 503 and the brake disc 502 are in a critical state of engagement and disengagement, and when the nut assembly 507 and the piston assembly 506 generate an initial set gap, this state is defined as the normal release state.

[0045] Example 2

[0046] like Figure 6 As shown, a method for detecting wear on vehicle friction pads includes the following steps:

[0047] S10: This detection function is triggered by the driver clicking to view the friction pad wear information on the driver operation interface 1 and sending the detection command to the brake controller 3.

[0048] S20: After receiving the detection command, the brake controller 3 will determine the vehicle status, including but not limited to vehicle speed, gear position, gradient, and brake pedal position. When the detection conditions are met, the brake controller will enter diagnostic mode.

[0049] S30: After entering diagnostic mode, the brake controller sends a friction pad wear detection command to the four-wheel brake controller.

[0050] S40: Taking the left front brake module as an example, the brake controller 505 controls the brake to achieve... Figure 3 The initial clamping state is shown. After the initial clamping state is completed, the brake controller 505 controls the brake to reach the initial clamping state. Figure 4 The image shows the fully released state. It should be noted that, in order to enter the initial clamping state and the fully released state, the brake controller needs to control the brake drive mechanism 504 in conjunction with operating parameters such as motor current and speed.

[0051] For calculating the wear of the friction plate:

[0052] The brake controller 505 will adjust the brake output according to the brake's position. Figure 3 The initial clamping state shown is operated until Figure 4The rotation angle of the motor output shaft in the fully released state is calculated and converted into the linear motion distance S of the nut assembly 507. When a brand-new brake is shipped from the factory, the linear motion distance S0 of the nut assembly 507 converted under the same process is stored in the brake controller 505. The brake controller 505 estimates (S-S0) / 2 as the wear amount of the friction pads.

[0053] S50: After the brake controller 505 completes the calculation of the friction pad wear, it will control the brake to run to... Figure 5 The normal release state is shown, and this state is fed back to the brake controller 3;

[0054] S60: The brake controller exits diagnostic mode based on the status feedback from the four-wheel brake controller;

[0055] S70: The brake controller processes the wear information of the four wheel friction pads and sends it to the driver's operating interface for display.

[0056] This invention discloses a vehicle friction pad wear detection system and method. The driver can view friction pad wear information via an interface. The brake controller sends a friction pad wear detection command to the four-wheel brake controller. The four-wheel brake controller controls the brakes to clamp and fully release, calculating the friction pad wear amount based on the motor operating parameters during this process and feeding the wear amount back to the brake controller. The brake controller comprehensively processes the four-wheel friction pad wear information and sends it to the driver's interface for display.

[0057] This invention relates to a brake-by-wire system based on a four-wheel electromechanical braking module. It can obtain information on the wear of the four-wheel friction pads based on data from the system's own sensors, eliminating the need for additional friction pad wear detection components. It offers advantages such as simple maintenance and low cost. This invention provides drivers with accurate friction pad wear information, improving the convenience of vehicle maintenance and enhancing the user experience.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A vehicle friction pad wear detection system, characterized in that, The system includes a driver's operating interface, a brake controller, and electromechanical brake modules mounted on the wheel wells. The driver's operating interface is connected to the brake controller, and the brake controller is connected to the electromechanical brake modules. The electromechanical brake modules include a brake caliper, a brake disc, friction pads, a brake drive mechanism, and a brake controller. The friction pads are disposed on both sides of the brake disc. The brake controller is connected to the brake drive mechanism. The brake caliper has a reciprocating actuator inside, which is located close to the friction pads on the inner side. The other end of the reciprocating actuator is connected to the brake drive mechanism.

2. The vehicle friction pad wear detection system according to claim 1, characterized in that, The reciprocating actuator includes a piston assembly, a lead screw assembly, and a lead screw assembly disposed inside the brake caliper body. The lead screw assembly is helically sleeved on the outside of the lead screw assembly, and the lead screw assembly is connected to the brake drive mechanism.

3. The vehicle friction pad wear detection system according to claim 2, characterized in that, The brake drive mechanism drives the lead screw assembly to rotate, and the lead screw nut assembly moves linearly in both directions along the axial direction of the lead screw assembly.

4. The vehicle friction pad wear detection system according to claim 2, characterized in that, A needle roller bearing assembly is provided between the lead screw assembly and the inner end face of the brake caliper body.

5. The vehicle friction pad wear detection system according to claim 4, characterized in that, The brake drive mechanism includes a motor that generates power and a transmission device, and also includes a sensor that measures the rotation angle of the motor output shaft.

6. The vehicle friction pad wear detection system according to claim 5, characterized in that, The nut assembly moves toward the friction pad closer to the inside, the piston assembly is in contact with the friction pad located on the inside, and the state when the friction pad applies braking force to the brake disc exceeding a set threshold is the initial clamping state of the brake.

7. The vehicle friction pad wear detection system according to claim 6, characterized in that, The end of the lead screw assembly near the needle roller bearing assembly has a first protrusion structure, and the end of the lead screw assembly near the lead screw assembly has a second protrusion structure. The lead screw assembly moves away from the friction plate along the axial direction of the lead screw assembly. When the first protrusion structure contacts the second protrusion structure, the state in which a reaction force is generated to prevent the rotation of the lead screw assembly is the fully released state.

8. The vehicle friction pad wear detection system according to claim 7, characterized in that, The friction pad and the brake disc are in a critical state of contact and separation. The nut assembly and the piston assembly generate an initial set gap. That is, the state when the piston assembly and the friction pad generate a set gap is the normal release state.

9. The detection method of the vehicle friction pad wear detection system according to claim 8, characterized in that, Includes the following steps: S10: Click to view friction pad wear information on the driver's operating interface and send the detection command to the brake controller; S20: After receiving the detection command, the brake controller judges the vehicle status. When the detection conditions are met, the brake controller will enter the diagnostic mode. S30: After entering the diagnostic mode, the brake controller sends a friction pad wear detection command to the brake controller; S40: The brake controller controls the brake drive mechanism to reach the initial clamping state. After the initial clamping state is completed, the brake controller controls the brake drive mechanism to reach the fully released state. S50: After the brake controller completes the calculation of the friction pad wear, it will control the brake drive mechanism to operate in a normal release state and feed back the normal release state to the brake controller. S60: The brake controller exits the diagnostic mode based on the status feedback from the brake controller; S70: The brake controller processes the friction pad wear information and sends it to the driver's operating interface for display to the driver.

10. The detection method of the vehicle friction pad wear detection system according to claim 9, characterized in that, In S40, the calculation of the friction pad wear includes the following steps: The brake controller calculates the rotation angle of the motor output shaft when the brake moves from the initial clamping state to the fully released state, and converts it into the linear motion distance S of the nut assembly. When the brake is shipped in a brand new state, the linear motion distance S0 of the nut assembly converted under the same process is stored in the brake controller. The brake controller calculates (S-S0) / 2 as the friction pad wear.

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