Brake noise control systems, methods, vehicles, and computer program products

Abstract

This application relates to the field of automotive technology, and more particularly to a control system, method, vehicle, and computer program product for reducing or eliminating braking noise while ensuring vehicle braking performance as much as possible. The system includes: a brake disc and a brake drive mechanism; the brake drive mechanism is configured to receive a brake control command; in response to the brake control command, drive a friction pad with a first pressure to move towards and press against the brake disc in a first direction, the first direction being parallel to the axial direction of the brake disc; during the movement of the friction pad, if a preset control noise suppression start condition is met, drive the friction pad with a second pressure to press against the brake disc in the first direction; the first pressure is greater than the second pressure; the brake disc is configured to, as the wheel rotates, drive the friction pad to slide in a second direction while pressed against it. This application reduces or eliminates braking noise by decreasing the sliding speed of the friction pad.

Description

Technical Field

[0001] This application relates to the field of automotive technology, and more particularly to a control system, method, vehicle, and computer program product for brake noise. Background Technology

[0002] Braking noise is the crisp, metallic clanging sound emitted from the wheels when a vehicle first moves forward or backward. This is caused by the vibration of an object. Due to the clearance between the friction pads and the caliper bracket, the friction pads move within this clearance and impact the bracket during braking. When the elastic medium transmits energy as sound waves, it produces noise within the frequency range perceptible to the human ear. Surveys show that braking noise is one of the most concerning issues for car owners and one of the most frequently complained about problems.

[0003] In related technologies, most solutions to this problem focus on controlling the fit clearance between the friction pads and the caliper bracket to suppress or eliminate braking noise. However, if this clearance is too small, it may cause other braking problems, such as excessive drag affecting the vehicle's range. Alternatively, applying buffer grease to control the fit clearance between the friction pads and the caliper bracket may be an option, but the grease will fall off after a period of use, thus losing its buffering effect, and then the noise will reappear.

[0004] In summary, how to reduce or eliminate braking noise while ensuring vehicle braking performance as much as possible is an urgent problem to be solved. Summary of the Invention

[0005] This application provides a control system, method, vehicle, and computer program product for braking noise, used to reduce or eliminate braking noise while ensuring vehicle braking performance as much as possible.

[0006] On one hand, embodiments of this application provide a control system for braking noise, the system comprising: a brake disc and a brake drive mechanism;

[0007] The brake drive mechanism is configured to: receive a brake control command; respond to the brake control command by driving a friction pad to move toward the brake disc in a first direction with a first pressure and press against the brake disc, the first direction being parallel to the axial direction of the brake disc; during the process of driving the friction pad to move, if a preset noise suppression start condition is met, drive the friction pad to press against the brake disc in the first direction with a second pressure; the first pressure is greater than the second pressure.

[0008] The brake disc is used to drive the friction pad to slide in the second direction when it is pressed against the friction pad as the wheel rotates; wherein the second direction is approximately the same as the circumferential direction of the brake disc.

[0009] On the one hand, this application provides a method for controlling braking noise, applied to a braking drive mechanism in a braking system, the method comprising:

[0010] Receive braking control commands;

[0011] In response to the braking control command, the friction pad is driven to move toward the brake disc in a first direction and press against the brake disc with a first pressure, the first direction being parallel to the axial direction of the brake disc;

[0012] During the process of driving the friction pad to move, if a preset noise suppression start condition is met, the friction pad is driven to press against the brake disc in a first direction with a second pressure; the first pressure is greater than the second pressure; wherein, the brake disc is used to rotate with the wheel and, when pressed against the friction pad, drive the friction pad to slide in the second direction; wherein, the second direction is approximately the same as the circumferential direction of the brake disc.

[0013] Optionally, the method further includes:

[0014] During the process of driving the friction pad to slide, if the noise suppression termination condition is met, the friction pad is driven to press against the brake disc in the first direction with a third pressure; wherein the third pressure is greater than the second pressure.

[0015] Optionally, the noise suppression initiation condition includes at least one of the following:

[0016] The braking duration is detected to have reached the preset braking duration; the braking duration is the time required for the friction pad to move toward the brake disc in the first direction after responding to the braking control command;

[0017] The friction pad was detected to be in contact with the brake disc.

[0018] The motion parameters of the friction plate in the second direction are detected to have reached a preset parameter threshold.

[0019] Optionally, the friction pad slides along the caliper bracket sliding groove in the second direction; the noise suppression termination condition includes at least one of the following:

[0020] It was detected that, in the second direction, the mating clearance between the friction pad back plate protrusion and the caliper bracket sliding groove was less than a preset clearance.

[0021] The second pressure was detected to have suppressed the friction plate for a preset duration threshold.

[0022] It was detected that the friction plate was suppressed by the second pressure, causing the sliding speed of the friction plate to decrease by a preset speed value.

[0023] Optionally, the braking control command is triggered in any of the following scenarios:

[0024] The initial braking of the vehicle as it switches from forward to reverse;

[0025] The vehicle's initial braking action, switching from reversing to moving forward.

[0026] Optionally, the motion parameters are determined in the following manner:

[0027] During vehicle braking, the motion parameters of the friction pads are acquired by sensors; or

[0028] During vehicle braking, the motion parameters of the friction pad are predicted by detecting the fit clearance between the protrusion of the friction pad backing plate and the sliding groove of the caliper bracket.

[0029] Optionally, the motion parameters include at least one of the displacement parameters of the friction plate and the sliding speed parameters; the preset parameter threshold includes at least one of the preset speed threshold and the preset displacement threshold.

[0030] Then, during the process of driving the friction pad to move, if a preset noise suppression start condition is met, the friction pad is driven by a second pressure to press against the brake disc in a first direction, including:

[0031] If the motion parameters include a sliding speed parameter, then when the sliding speed parameter of the friction pad is detected to be greater than the preset speed threshold, the friction pad is driven to press against the brake disc in the first direction with a second pressure.

[0032] If the motion parameters include displacement parameters, then when the displacement parameter of the friction pad is detected to be greater than the preset displacement threshold, the friction pad is driven to press against the brake disc in the first direction with a second pressure.

[0033] Optionally, when multiple sensors are mounted on the friction plate, detecting that the motion parameter of the friction plate in the second direction reaches a preset parameter threshold includes:

[0034] It is determined that at least one of the motion parameters acquired by the multiple sensors installed on the friction plate is greater than the preset parameter threshold.

[0035] Optionally, the sensor includes a first capacitor and a second capacitor, wherein the first capacitor is mounted on the upper plane of the caliper bracket guide rail, and the second capacitor is mounted on the upper plane of the friction pad back plate protrusion.

[0036] The step of acquiring the motion parameters of the friction plate through a sensor includes:

[0037] By obtaining the distance between the first capacitor and the second capacitor, the displacement parameters corresponding to the friction pads are determined.

[0038] On the one hand, embodiments of this application provide a vehicle, the vehicle including the braking noise control system described in any of the above claims.

[0039] On the one hand, the computer program product provided in this application includes a computer program that, when executed by a processor, implements any of the braking noise control methods described above.

[0040] Optionally, the computer-readable storage medium can be an implementation of a computer program product. That is, the embodiments of this application also provide a computer-readable storage medium including a computer program that, when executed by a processor, implements any of the braking noise control methods described above.

[0041] The beneficial effects of this application are as follows:

[0042] This application provides a control system, method, vehicle, and computer program product for braking noise. In related technologies, most solutions to this problem focus on controlling the clearance between the friction pads and the caliper bracket to suppress or eliminate braking noise. However, if this clearance is too small, it may cause other braking problems, such as excessive drag affecting the vehicle's range. In this application, the pressure of the driving friction pads is adjusted, i.e., from a first pressure to a second pressure, thereby reducing the slip speed of the friction pads. Since the friction pad speed is positively correlated with braking noise, reducing the friction pad speed can suppress or eliminate braking noise. This control method avoids the problem of excessively small clearance between the friction pads and the caliper bracket causing other braking problems. Instead, it directly reduces the slip speed of the friction pads to achieve the purpose of suppressing or eliminating braking noise.

[0043] Other features and advantages of this application will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the application. The objectives and other advantages of this application may be realized and obtained by means of the structures particularly pointed out in the written description, claims, and drawings. Attached Figure Description

[0044] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0045] Figure 1 This is a schematic diagram illustrating an application scenario for brake noise control provided in an embodiment of this application;

[0046] Figure 2This is a schematic diagram of a braking noise control system provided in an embodiment of this application;

[0047] Figure 3 A flowchart of a braking noise control method provided in this application embodiment;

[0048] Figure 4 A structural diagram showing the mounting position of a friction pad provided in an embodiment of this application;

[0049] Figure 5 This application provides a structural diagram of a braking noise generation method.

[0050] Figure 6 This is a structural diagram showing the mounting position of a friction plate and a caliper, provided in an embodiment of this application.

[0051] Figure 7 A structural diagram of a friction pad subjected to force is provided in an embodiment of this application;

[0052] Figure 8 A structural diagram of a sensor mounting location provided in an embodiment of this application;

[0053] Figure 9 This is a schematic diagram of the hardware structure of a control device according to an embodiment of this application;

[0054] Figure 10 This is a schematic diagram of the structure of an electronic device for braking noise control implemented in this application example;

[0055] Figure 11 This is a schematic diagram of the hardware structure of a computing device according to an embodiment of this application. Detailed Implementation

[0056] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this application. Obviously, the described embodiments are only some embodiments of the technical solutions of this application, and not all embodiments. Based on the embodiments recorded in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the technical solutions of this application.

[0057] The following describes some of the concepts involved in the embodiments of this application.

[0058] Braking noise refers to the noise generated during braking, caused by the vibration of an object, through which energy is transmitted via sound waves by an elastic medium, and within the frequency range (20Hz-20000Hz) perceptible to the human ear. In this application, braking noise specifically refers to clonk noise, which is the crisp metallic impact sound emitted from the wheels when the vehicle first moves forward or backward.

[0059] Caliper: It comprises at least two parts: a caliper bracket and a caliper body. Friction pads are mounted on the caliper bracket. In response to braking control commands, a piston within the caliper body pushes the friction pads against the brake disc, generating braking force. There is a certain clearance between the friction pads and the caliper bracket. When the vehicle brakes, the friction pads slip, causing the friction pad backing plate protrusions to move within the clearance and impact the caliper bracket, generating noise. Two holes on the caliper bracket are used to secure the caliper to the steering knuckle; the caliper and steering knuckle are rigidly connected. In this field, the friction pad backing plate protrusions are commonly referred to as friction pad ears.

[0060] Braking drive mechanism: In this application, the braking drive mechanism includes friction pads, caliper pistons, and braking system pressure, etc. The braking of the vehicle is achieved through the braking drive mechanism according to braking control commands.

[0061] Braking System: In this application, the braking system is essentially a braking stability control device, including components such as a brake disc and a brake drive mechanism. The brake disc drives the friction pads to slide along the caliper bracket sliding groove in a second direction, generating braking noise. The brake drive mechanism acts as an actuator to suppress braking noise. The brake drive mechanism includes friction pads, a caliper piston, and further includes hydraulic components and an electronic stability control system to regulate the braking system pressure by controlling the brake fluid flow rate and velocity. Hydraulic components include brake fluid, wheel brakes, caliper cylinders, and caliper pistons. The electronic stability control system includes normally open valves, normally closed valves, brake fluid reservoirs, and a master cylinder. For the brake drive mechanism, each wheel is equipped with one wheel brake and at least one caliper cylinder. This brake stability control device controls the flow rate and volume of brake fluid through normally open and normally closed valves. For example, when the normally open valve is closed and the normally closed valve is open, brake fluid flows from the caliper cylinder at the wheel to the master cylinder, and then from the master cylinder to the brake reservoir. When the normally open valve is open and the normally closed valve is closed, brake fluid flows from the brake reservoir to the master cylinder, and then from the master cylinder to the caliper cylinder at the wheel. By controlling the flow rate and volume of brake fluid through the normally open and normally closed valves and the brake reservoir, the braking system pressure of each wheel in the vehicle can be regulated.

[0062] Noise Suppression Initiation Condition: This is an initiation condition for controlling braking noise, which can be a duration condition, a displacement condition, a motion parameter condition, etc. When the friction pad slides along the brake disc in the second direction, it will slide along the caliper bracket sliding groove and eventually slide towards the caliper bracket. Due to the relatively high sliding speed of the friction pad, it may generate significant braking noise upon impact with the caliper bracket. At this point, based on this condition, by reducing the driving pressure on the friction pad, and thus reducing the sliding speed of the friction pad towards the caliper bracket, braking noise can be effectively controlled.

[0063] Noise suppression termination condition: A termination condition for controlling braking noise, which can be a duration condition, displacement condition, speed condition, etc. Based on this condition, it can be determined that the braking noise has been effectively controlled after the vehicle reduces the pressure of the drive friction pads. Therefore, when this condition is met, the vehicle can be returned to normal braking state by changing the pressure of the drive friction pads again.

[0064] The preferred embodiments of this application are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit this application. Furthermore, the embodiments and features in the embodiments of this application can be combined with each other without conflict.

[0065] like Figure 1 The diagram illustrates an application scenario for brake noise control provided in this application. The application scenario diagram includes a control system 110. Specifically, the control system 110 can be installed on the vehicle 10, or it can be a server independent of the vehicle 10.

[0066] Optionally, the control system may include the following three parts: a sensor for acquiring friction pad slip speed parameters or displacement parameters; a control unit (ECU) for receiving parameters acquired by the sensor and issuing control commands to the braking system pressure; and a braking system for adjusting the braking system pressure.

[0067] Alternatively, the control system may consist only of a control unit (ECU) for receiving parameters from sensors and issuing control commands to the braking system to regulate braking system pressure. The sensors and braking system are treated as independent devices of the control system, and the control system is connected to the sensors and braking system via a communication network, which can be a wired or wireless network.

[0068] In this application embodiment, when the control system 110 is a server, the server can be an independent physical server, a server cluster or distributed system composed of multiple physical servers, or a cloud server that provides basic cloud computing services such as cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communication, middleware services, domain name services, security services, content delivery networks (CDN), and big data and artificial intelligence platforms.

[0069] The following describes the braking noise control method provided by the exemplary embodiments of this application in conjunction with the application scenarios described above and with reference to the accompanying drawings. It should be noted that the above application scenarios are only shown to facilitate understanding of the spirit and principles of this application, and the embodiments of this application are not limited in any way in this respect.

[0070] See Figure 2 As shown, this is a schematic diagram of a braking noise control system provided in an embodiment of this application. The control system 210 includes a braking drive mechanism 211 and a brake disc 212, as... Figure 3 The diagram shown is a flowchart of a braking noise control method provided in an embodiment of this application, which is applied to... Figure 2 The brake drive mechanism shown causes the brake drive mechanism to perform S301-S303:

[0071] S301: Receives braking control commands.

[0072] During vehicle operation, upon receiving the first braking command from the subject (i.e., the subject initially presses the brake pedal), the system begins subsequent braking operations and noise suppression.

[0073] One feasible implementation is that, during vehicle operation, the object braking control command can be triggered in any of the following scenarios:

[0074] The initial braking of the vehicle when switching from forward to reverse;

[0075] The vehicle brakes for the first time when it switches from reversing to moving forward.

[0076] For example, during a vehicle's journey, if the object presses the brake pedal while the vehicle is moving forward, which is the initial braking when the vehicle switches from forward to reverse, the brake drive mechanism receives the braking control command and performs subsequent braking and braking noise suppression operations.

[0077] S302: In response to a braking control command, the friction pad is driven to move toward the brake disc in a first direction and press against the brake disc with a first pressure, the first direction being parallel to the axial direction of the brake disc.

[0078] S303: During the movement of the driving friction pad, if the preset noise suppression start condition is met, the friction pad is driven to press against the brake disc in the first direction with the second pressure.

[0079] The first pressure is greater than the second pressure; the second direction is approximately the same as the circumferential direction of the brake disc; when the brake disc drives the friction pad to slide in the second direction, the friction pad slides along the caliper bracket sliding groove in the second direction. The brake disc is used to rotate with the wheel and, when pressed against the friction pad, drive the friction pad to slide in the second direction; wherein, the second direction is approximately the same as the circumferential direction of the brake disc.

[0080] Upon receiving a braking control command, a first pressure drives the friction pad to press against the brake disc in the first direction, i.e., axially. During this process, the friction pad moves towards the brake disc. At this time, the vehicle is in a normal braking state, the vehicle speed decreases, and the friction pad's sliding speed increases. As the brake disc drives the friction pad to slide in the second direction, the friction pad slides along the caliper bracket's sliding groove, and the friction pad's back plate protrusion at one end slides towards the caliper bracket adjacent to that end. When the friction pad's movement reaches the noise suppression start condition, to prevent the friction pad's back plate protrusion from colliding with the caliper bracket and generating noise, a second pressure replaces the first pressure, driving the friction pad to press against the brake disc. Since the second pressure is less than the first pressure, the contact surface pressure between the friction pad and the brake disc, i.e., the clamping force between the friction pad and the brake disc, decreases, and the friction pad's sliding speed decreases accordingly. Therefore, noise can be effectively reduced or avoided. The process of changing from the first pressure to the second pressure can be understood as a state change process where the clamping force of the friction pad on the brake disc increases under the first pressure and decreases under the second pressure.

[0081] In the embodiments of this application, the specific location of the friction pads on the vehicle wheels can be found in [reference needed]. Figure 4 .

[0082] like Figure 4 The diagram shown is a structural diagram of a friction pad mounting position provided in an embodiment of this application. The friction pads on each wheel of the vehicle are mounted on caliper brackets. The caliper brackets serve as both mounting brackets and sliding tracks for the friction pads, thus there is a certain clearance between the friction pads and the caliper brackets. When the vehicle brakes, the friction pads slip, causing the protrusions of the friction pad backing plate to move within the clearance and impact the caliper brackets, producing... Figure 5 The impact marks are shown, and a "dang" sound is produced, which is the noise of metal being struck.

[0083] For example, when a vehicle brakes in the forward direction, refer to... Figure 6 Structural diagram of the friction plate and caliper. Figure 6The forward direction of travel is from B to A, and the caliper bracket is rigidly connected to the steering knuckle. When the vehicle brakes while traveling in the forward direction, the friction pads move downwards under the initial pressure, i.e., towards A. At this time, the gap between the friction pad and the caliper bracket at A is 0mm, and the friction pad backing plate protrusion impacts the caliper bracket at A, generating braking noise. Simultaneously, the gap between the friction pad and the caliper bracket at B is at its maximum value. When the vehicle brakes in reverse in the forward direction, the friction pads move upwards under the initial pressure, i.e., towards B. At this time, the gap between the friction pad and the caliper bracket at B is 0mm, and the friction pad backing plate impacts the caliper bracket at B, generating braking noise. Simultaneously, the gap between the friction pad and the caliper bracket at A is at its maximum value.

[0084] To address the aforementioned braking noise problem, this application embodiment reduces the pressure on the driving friction pads, specifically by switching from driving the friction pads with a first pressure to driving them with a second pressure, thereby reducing the sliding speed of the friction pads and effectively reducing or preventing noise generation.

[0085] When addressing braking noise issues, the conditions for triggering braking noise should be determined first. In one feasible implementation, the conditions for suppressing noise include at least one of the following:

[0086] When the friction pad is driven to move toward the brake disc in the first direction using the first pressure, the noise suppression start condition can be determined by the following method one, regardless of whether the friction pad is in contact with the brake disc; if the friction pad is not in contact with the brake disc, the noise suppression start condition can be determined by the following method two; if the friction pad is in contact with the brake disc, the noise suppression start condition can be determined by the following method three.

[0087] Method 1: The braking duration is detected to have reached the preset braking duration; the braking duration is the time required for the friction pad to move toward the brake disc in the first direction after responding to the braking control command.

[0088] Specifically, the preset braking duration is not a fixed value and needs to be adjusted based on the vehicle's overall parameters.

[0089] When the first pressure drives the friction pad, the control unit adjusts according to the vehicle's overall parameters to obtain the specific value of the preset braking duration. After the preset control duration is reached, the braking drive mechanism replaces the first pressure with the second pressure to start suppressing braking noise.

[0090] For example, for a vehicle responding to a braking control command, the control unit adjusts based on the brake pedal pressure at that moment and determines the specific adjustment time to be 40ms. Therefore, when the first pressure drives the friction pad for 40ms, the brake drive mechanism uses the second pressure to replace the first pressure to drive the friction pad and begins to suppress braking noise.

[0091] Method 2: The friction pads and brake discs have begun to make contact.

[0092] Specifically, when the first pressure drives the friction pad to move toward the brake disc in the first direction, if the friction pad begins to contact the brake disc, the brake disc will cause the friction pad to collide with the caliper bracket. Therefore, in order to avoid the friction pad colliding with the caliper bracket at a large sliding speed under the drive of the brake disc and causing braking noise, when the friction pad begins to contact the brake disc, that is, when the gap between the friction pad backing plate protrusion and the caliper bracket is less than the preset contact gap, the second pressure should be used to replace the first pressure to drive the friction pad and begin to suppress braking noise.

[0093] In one feasible implementation, the preset contact gap can be 9 mm, that is, the friction pad begins to contact the brake disc under the first pressure drive, and when the gap between the friction pad back plate protrusion and the caliper bracket is less than 9 mm, the friction pad is driven by the second pressure.

[0094] Method 3: The motion parameters of the friction plate in the second direction are detected to reach the preset parameter threshold.

[0095] In one feasible implementation, the motion parameters are determined as follows:

[0096] During vehicle braking, the motion parameters of the friction pads are acquired by sensors; or

[0097] During vehicle braking, the motion parameters of the friction pad are predicted by detecting the mating clearance between the protrusion on the back plate of the friction pad and the sliding groove of the caliper bracket.

[0098] The motion parameters include at least one of the slip velocity parameter and displacement parameter of the friction pads, and the sensors include at least one of the slip velocity sensor and displacement sensor. That is, on the vehicle, at least one friction pad is installed on each wheel, and at least one of the slip velocity sensor and displacement sensor is installed on each friction pad. During braking, the slip velocity sensor and / or displacement sensor are used to acquire the changes in slip velocity and / or displacement generated by the friction pads in real time.

[0099] For example, a vehicle has four wheels: left front, left rear, right front, and right rear. Each of these four wheels has two friction pads, including an inner friction pad and an outer friction pad. Each friction pad is equipped with a corresponding slip speed sensor to obtain the slip speed of the corresponding friction pad in real time. When the vehicle brakes, the above eight slip speed sensors can upload the slip speed of the corresponding friction pad during braking to the control unit.

[0100] The preset parameter thresholds include at least one of a preset velocity threshold and a preset displacement threshold.

[0101] In this embodiment of the application, when the friction pad is driven by the first pressure, if the brake disc and the friction pad are already in contact, the control unit receives the friction pad motion parameters uploaded by the sensor, compares the friction pad motion parameters with the preset parameter threshold, determines any one friction pad that needs to be adjusted, determines this one friction pad as a target friction pad, and adjusts the braking system pressure through the control unit to reduce the sliding speed of the target friction pad in order to control braking noise.

[0102] Specifically, the motion parameters and corresponding sensor identifiers acquired by each sensor are sent to the control unit. When the motion parameters of at least one target friction plate are determined to be greater than a preset parameter threshold, the sliding speed of each of the at least one target friction plate is reduced by adjusting the braking system pressure.

[0103] Optionally, brake noise can be controlled by following these steps.

[0104] First, the control unit compares each motion parameter with a preset parameter threshold.

[0105] Assuming a four-wheeled vehicle, when the friction pads are driven by the first pressure, if the brake disc and friction pads are already in contact, the control unit receives the friction pad slip speed parameters uploaded by sensors. The control unit also receives the slip speed parameters uploaded by the slip speed sensors corresponding to the friction pads on each wheel of the vehicle. Specifically, the slip speed parameter of the left front wheel is 8.2 km / h (kph), the left rear wheel is 7.6 kph, the right front wheel is 7.9 kph, and the right rear wheel is 7.8 kph. These slip speed parameters from the four sensors are then compared to a preset slip speed threshold of 8 kph.

[0106] Then, identify the sensor identifier of the sensor whose corresponding sliding speed parameter is greater than the preset sliding speed threshold.

[0107] Based on the previous step, it can be determined that the sensor on the left front wheel has a slip speed parameter that is greater than the preset slip speed threshold. The sensor identifier of the left front wheel and the slip speed parameter obtained by the sensor are then uploaded to the control unit.

[0108] Finally, the corresponding friction pad is determined based on the identified sensor, and the braking system pressure of the friction pad is reduced by the control unit.

[0109] Based on the received sensor identifiers, the control unit identifies the target friction pad that may be emitting braking noise as the friction pad mounted on the left front wheel. The control unit then reduces the braking system pressure on that target friction pad. See also... Figure 7 By analyzing the forces acting on the friction plates and the formula for their sliding speed, it can be concluded that the braking system pressure of the friction plates is positively correlated with their sliding speed.

[0110] like Figure 7 The diagram shown is a structural diagram of a friction pad subjected to force according to an embodiment of this application. Figure 7 The diagram shows the force structure of the caliper bracket, brake disc, caliper piston, and friction pads in the braking control mechanism under normal vehicle braking conditions and when noise is suppressed. When the braking control command is triggered by the brake pedal, a braking system pressure pA, i.e., the first pressure, is applied to the caliper piston. This first pressure drives the friction pads to press against the brake disc. The direction of pA is the first direction. Since the brake disc rotates with the wheel, the friction pads, driven by the brake disc, collide with the caliper bracket in the second direction, producing braking noise. Figure 7 Other parameters are described in detail using the following formula 1.

[0111] In this embodiment, the formula for calculating the sliding speed of the friction plate is as follows:

[0112]

[0113] Where υ is the sliding speed of the friction plate; m is the weight of the friction plate; μ B μ is the coefficient of friction between the friction pad and the brake disc. S The friction coefficient between the friction pad backing plate (or friction pad muffler) and the piston; pA is the braking system pressure, i.e., one of the first pressure, second pressure, and third pressure; Δx is the clearance between the friction pad backing plate protrusion and the steering knuckle caliper bracket; μ M F is the coefficient of friction between the friction plate backplate protrusion and the caliper bracket. F The spring force supporting the friction plate (the presence of this spring force depends on the caliper structure).

[0114] Furthermore, since the sliding speed of the friction pad is positively correlated with braking noise—that is, the lower the sliding speed of the friction pad, the lower the braking noise—in this embodiment of the application, by reducing the braking system pressure of the target friction pad, the sliding speed of the target friction pad is reduced, thereby effectively avoiding collisions or reducing braking impact noise.

[0115] Since any friction pad installed on the vehicle wheel in this application may be equipped with at least one of a displacement sensor and a sliding speed sensor, the motion parameters can be compared with preset parameter thresholds in the following two ways in the embodiments of this application.

[0116] Method 1: If the motion parameters include the sliding speed parameter, when the sliding speed parameter of the friction pad is detected to be greater than the preset speed threshold, the friction pad is driven to press against the brake disc in the first direction with the second pressure to inhibit the friction pad from sliding along the caliper bracket sliding groove in the second direction, thereby reducing the sliding speed of the friction pad.

[0117] Specifically, when the displacement parameter obtained by the displacement sensor of the target friction pad reaches the preset displacement threshold, the parameter value and the sensor identifier can be sent to the control unit. The control unit determines the friction pad that needs to be adjusted in the braking system based on the sensor identifier, and sends the information that the friction pad needs to be adjusted to the braking system to complete the adjustment of the braking system pressure of the friction pad. The friction pad is driven by a second pressure less than the first pressure to press against the brake disc in the first direction. The second pressure inhibits the friction pad from sliding along the caliper bracket sliding groove in the second direction, reducing the sliding speed of the friction pad, thereby suppressing or reducing braking noise.

[0118] Method 2: If the motion parameters include displacement parameters, when the displacement parameter of the friction pad is detected to be greater than the preset displacement threshold, the friction pad is driven to press against the brake disc in the first direction with the second pressure to inhibit the friction pad from sliding along the caliper bracket sliding groove in the second direction, thereby reducing the sliding speed of the friction pad.

[0119] Specifically, when the sliding speed parameter obtained by the sliding speed sensor of the target friction pad reaches the preset displacement threshold, the parameter value and the sensor identifier can be sent to the control unit. The control unit determines the friction pad that needs to be adjusted in the braking system based on the sensor identifier, and sends the information that the friction pad needs to be adjusted to the braking system to complete the adjustment of the braking system pressure of the friction pad. The friction pad is driven by a second pressure less than the first pressure to press against the brake disc in the first direction, and the second pressure inhibits the friction pad from sliding along the caliper bracket sliding groove in the second direction, thereby reducing the sliding speed of the friction pad and thus suppressing or reducing braking noise.

[0120] If multiple sensors are installed on the target friction plate, the motion parameters of the target friction plate are determined to be at the preset parameter threshold in the following manner.

[0121] It is determined that at least one of the motion parameters acquired by multiple sensors installed on the target friction plate is greater than a preset parameter threshold.

[0122] When multiple sensors are installed on the target friction pads mounted on the vehicle wheels, if any of the motion parameters obtained by these multiple sensors is greater than a preset parameter threshold, then the motion parameter and the identifier in the sensor are sent to the control unit to complete the subsequent control of the friction pad sliding speed.

[0123] This application takes into account that the braking system pressure is positively correlated with the sliding speed of the friction pad. Therefore, by adjusting the braking system pressure through the control unit, that is, by driving the friction pad with a second pressure that is less than the first pressure, the sliding speed of the target friction pad can be adjusted.

[0124] In one alternative implementation, the braking system pressure can be adjusted as follows:

[0125] The state of the solenoid valve in the brake drive mechanism is controlled to control the brake fluid to flow back from the caliper cylinder mounted on at least one target friction pad of the wheel to the master cylinder, and then from the master cylinder back to the brake fluid reservoir, thereby reducing the pressure of the braking system.

[0126] The brake drive mechanism includes a solenoid valve for controlling the flow of brake fluid and a brake fluid reservoir.

[0127] When the braking system receives a pressure reduction command from the control unit for each target friction pad, the solenoid valves controlling the flow of brake fluid—namely, the normally open valve and the normally closed valve—change their states. The normally open valve opens, and the normally closed valve closes, causing the brake fluid to flow from the caliper cylinder at the vehicle wheel to the master cylinder, and then from the master cylinder to the master valve, thereby reducing the braking system pressure of the braking drive mechanism.

[0128] Suppose a four-wheeled vehicle has a sensor that detects a sliding speed of 8.2 kph for the friction pad on its left front wheel, exceeding the preset sliding speed threshold of 8 kph. Upon receiving the sliding speed parameter and sensor identifier, the control unit determines that the sliding speed of the friction pad on the left front wheel needs adjustment. The control unit sends this command to the braking system at the left front wheel. Based on this command, the brake drive mechanism in the braking system closes the normally open valve and opens the normally closed valve. At this point, the braking system switches from a pressurized state to a depressurized state. The hydraulic pump returns brake fluid from the caliper cylinder at the left front wheel to the brake fluid reservoir, reducing the braking system pressure. This results in a second pressure, less than the first pressure, driving the friction pad and thus adjusting the sliding speed of the target friction pad.

[0129] In addition, an electronic stability control system can be used to regulate the braking system pressure. When a braking control command is received, the electronic stability control system controls the braking system pressure to a first pressure, driving the friction pads to move. When the noise suppression start condition is met, the electronic stability control system controls the braking system pressure to a second pressure, which is less than the first pressure, driving the friction pads to move, thereby reducing the friction pad sliding speed and reducing braking noise. When the noise suppression termination condition is met, the electronic stability control system controls the braking system pressure to a third pressure, which is greater than the second pressure, driving the friction pads to move, thereby returning the vehicle to a normal braking state.

[0130] This application embodiment controls the braking drive mechanism through the control system to adjust the pressure of the braking system, thereby reducing the sliding speed of the friction pads. While achieving the purpose of suppressing or reducing braking noise, it will not cause problems such as braking drag.

[0131] In this embodiment, the sensor includes a first capacitor and a second capacitor, the installation positions of which can be found in [reference needed]. Figure 8 A structural diagram showing the installation location of the sensor.

[0132] like Figure 8 The diagram shows a structural representation of a sensor mounting position according to an embodiment of this application. During vehicle braking, the friction pads move on the caliper bracket guide rail according to the displacement of the brake pedal. The first capacitor is mounted on the upper plane of the caliper bracket guide rail, and the second capacitor is mounted on the upper plane of the protrusion on the back plate of the friction pad. During vehicle braking, since the second capacitor is directly connected to the friction pads, when the user brakes by pressing the brake pedal, the friction pads move synchronously with it. Simultaneously, the second capacitor also moves, and the distance between the first and second capacitors changes accordingly, causing a change in the current flowing through the second capacitor. Therefore, by obtaining the current value flowing through the second capacitor through the change in the distance between the first and second capacitors, the displacement parameters corresponding to the friction pads can be determined.

[0133] The sliding speed parameter in this embodiment can be obtained from the quotient of the displacement parameter and the adjustment time. After obtaining the displacement parameter from the change in the distance between the first capacitor and the second capacitor, the sliding speed parameter is determined as the quotient of the displacement parameter divided by the adjustment time based on the adjustment time of the braking system pressure in the braking drive mechanism. This value is sent by the sliding speed sensor to the control unit to complete the subsequent steps of adjusting the sliding speed of the friction plate.

[0134] Furthermore, during the sliding of the driving friction pad, if the noise suppression termination condition is met, the friction pad is driven by a third pressure to press against the brake disc in the first direction.

[0135] The third pressure is greater than the second pressure.

[0136] When the friction pads are driven by the second pressure until the noise suppression termination condition is met, the friction pads are driven by the third pressure instead of the second pressure. The vehicle re-enters the normal braking state, and the friction pads press against the brake disc again in the first direction, thereby increasing the sliding speed of the friction pads.

[0137] For example, during a vehicle's operation, the object activates the braking noise reduction mode. When the friction pads are driven by the second pressure to reduce braking noise, the noise suppression termination condition is met. At this point, the friction pads are driven by a third pressure that is greater than the second pressure. As the driving pressure increases, the sliding speed of the friction pads increases accordingly, and the vehicle returns from the braking noise reduction state to the normal braking state.

[0138] It should be noted that if the vehicle faces an emergency, such as when there is an obstacle in front of the vehicle and braking is required to avoid a collision, the first pressure will be continuously used to drive the friction pads for braking, and the second pressure will not be used to reduce braking noise in order to ensure the safety of the driver in the vehicle.

[0139] After effective braking noise control of the friction pads, i.e., after the noise suppression termination condition is met, the vehicle can return to normal braking. In one feasible implementation, the noise suppression termination condition includes at least one of the following:

[0140] Method 1: It was detected that in the second direction, the mating clearance between the friction plate back plate protrusion and the caliper bracket sliding groove was less than the preset clearance.

[0141] In this embodiment of the application, the preset gap can be 0 mm.

[0142] Specifically, when the second pressure is used to drive the friction pad against the brake disc, the friction pad slides along the caliper bracket sliding groove in the second direction, following the brake disc, until the gap between the friction pad back plate protrusion and the caliper bracket is 0 mm, meaning the friction pad back plate protrusion and the caliper bracket have made contact. At this point, there is no need to suppress the friction pad, as there is no longer any possibility of it generating braking noise, and noise suppression can be terminated. Because the second pressure is less than the first pressure, the friction pad sliding speed is relatively low during this process, therefore no braking noise is generated or the braking noise is minimal.

[0143] Method 2: The second pressure was detected to drive the friction plate for a duration that reached a preset duration threshold.

[0144] The preset duration threshold is not a fixed value and needs to be specifically adjusted based on the vehicle's overall parameters.

[0145] When the brake drive mechanism adjusts the brake system pressure, that is, when the second pressure replaces the first pressure to drive the friction pad, the control unit adjusts according to the vehicle's overall parameters to obtain the specific value of the adjustment time at this time. After the brake drive mechanism adjusts the pressure by changing the state of the solenoid valve of the brake stability control device according to the adjustment time, when the pressure adjustment stops, the state of the solenoid valve of the brake stability control device is changed again according to the current state of the vehicle.

[0146] For example, for a vehicle that is adjusting the friction pad sliding speed, the control unit adjusts according to the brake pedal pressure at this time and determines the specific adjustment time to be 40ms. Therefore, when the second pressure drives the friction pad for 40ms, if the vehicle is still in a braking state, the normally open valve opens and the normally closed valve closes. The hydraulic pump delivers brake fluid from the brake reservoir to the master cylinder, and then from the master cylinder to the caliper cylinder at the left front wheel, using the third pressure to drive the friction pad, so that the vehicle continues to be in a normal braking state. If the vehicle's braking state has ended, the normally open valve remains closed and the normally closed valve remains open.

[0147] Method 3: It is detected that the friction plate is driven by the second pressure, which reduces the sliding speed of the friction plate by a preset speed value.

[0148] The preset speed value is not a fixed value and needs to be determined by specific adjustments based on the vehicle's overall parameters.

[0149] When the brake drive mechanism adjusts the brake system pressure, the control unit adjusts according to the vehicle's overall parameters to determine the specific preset speed value that the friction pads installed on the vehicle need to reduce. After the brake drive mechanism adjusts the pressure by changing the state of the solenoid valve of the brake stability control device according to the preset speed value, when the pressure adjustment stops, the solenoid valve state of the brake stability control device is changed again according to the current state of the vehicle.

[0150] For example, for a vehicle that is adjusting the sliding speed of the friction pads, the control unit adjusts according to the brake pedal pressure at this time to determine the specific preset speed reduction value of 3 kph for the friction pads installed on the vehicle. Therefore, when the friction pads are driven by the second pressure, causing the sliding speed of the friction pads to decrease by the preset speed value of 3 kph, if the vehicle is still in a braking state, the normally open valve opens and the normally closed valve closes. The hydraulic pump delivers brake fluid from the brake reservoir to the brake master cylinder, and then from the brake master cylinder to the caliper cylinder at the left front wheel. The third pressure drives the friction pads to keep the vehicle in a normal braking state. If the vehicle's braking state has ended, the normally open valve remains closed and the normally closed valve remains open.

[0151] In this embodiment, friction pad motion parameters sent by sensors are used to identify friction pads exceeding a preset parameter threshold. The braking coefficient pressure of these friction pads is then adjusted to reduce their sliding speed. This control method avoids excessively small gaps between the friction pads and caliper brackets, which could cause other vehicle braking problems. This achieves the goal of suppressing or eliminating braking noise while ensuring vehicle braking performance as much as possible.

[0152] Based on the same inventive concept as the above method embodiments, this application also provides a control device, including a memory 901, a communication module 903, and one or more processors 902.

[0153] The memory 901 is used to store computer programs executed by the processor 902. The memory 901 may mainly include a program storage area and a data storage area. The program storage area may store the operating system and programs required to run instant messaging functions, etc.; the data storage area may store various instant messaging information and operation instruction sets, etc.

[0154] Memory 901 may be volatile memory, such as random-access memory (RAM); memory 901 may also be non-volatile memory, such as read-only memory, flash memory, hard disk drive (HDD), or solid-state drive (SSD); or memory 901 may be any other medium capable of carrying or storing a desired computer program having the form of instructions or data structures and accessible by a computer, but is not limited thereto. Memory 901 may be a combination of the above-described memories.

[0155] The processor 902 may include one or more central processing units (CPUs) or digital processing units, etc. The processor 902 is used to implement the aforementioned braking noise control method when calling the computer program stored in the memory 901.

[0156] The communication module 903 is used to communicate with terminal devices and other servers.

[0157] This application embodiment does not limit the specific connection medium between the memory 901, communication module 903, and processor 902 described above. This application embodiment... Figure 9 The memory 901 and the processor 902 are connected via a bus 904, which is in... Figure 9 The diagram uses thick lines to describe the connections between other components; these are for illustrative purposes only and should not be considered limiting. The 904 bus can be divided into address bus, data bus, control bus, etc. For ease of description, Figure 9 It is described using only a thick line, but does not indicate that there is only one bus or one type of bus.

[0158] The memory 901 stores a computer storage medium containing computer-executable instructions for implementing the braking noise control method of this application embodiment. The processor 902 executes the aforementioned braking noise control method, such as... Figure 3 As shown.

[0159] In some implementations, after the method executed by the processor is formed into a program, the hardware execution modules corresponding to each program functional module may include: an acquisition module and a control module, which are connected together.

[0160] like Figure 10 As shown, this is a schematic diagram of the composition of a braking noise control device 100 according to an embodiment of this application. The braking noise control device includes an acquisition module 1001 and a control module 1002, wherein:

[0161] The receiving module 1001 is used to receive braking control commands.

[0162] The response module 1002 is used to respond to a braking control command by driving the friction pad to move toward the brake disc in a first direction and press against the brake disc with a first pressure, the first direction being parallel to the axial direction of the brake disc.

[0163] Suppression start module 1003: When the preset noise suppression start condition is met during the movement of the driving friction pad, the friction pad is driven to press against the brake disc in the first direction with a second pressure; the first pressure is greater than the second pressure.

[0164] Optionally, the control device also includes a suppression termination module 1004:

[0165] If the noise suppression termination condition is met during the sliding of the driving friction pad, the friction pad is driven to press against the brake disc in the first direction with a third pressure; wherein the third pressure is greater than the second pressure.

[0166] Optionally, the noise suppression initiation condition includes at least one of the following:

[0167] The braking duration is detected to have reached the preset braking duration; the braking duration is the time required for the friction pads to move toward the brake disc in the first direction in response to the braking control command.

[0168] The friction pads have begun to make contact with the brake disc;

[0169] The motion parameters of the friction plate in the second direction were detected to have reached the preset parameter threshold.

[0170] Optionally, the friction pad slides along the caliper bracket sliding groove in the second direction; the noise suppression termination condition includes at least one of the following:

[0171] It was detected that, in the second direction, the mating clearance between the friction pad back plate protrusion and the caliper bracket sliding groove was less than the preset clearance.

[0172] The second pressure was detected to drive the friction plate for a duration that reached a preset duration threshold.

[0173] It was detected that the friction plate was driven by the second pressure, which reduced the sliding speed of the friction plate by a preset speed value.

[0174] Optionally, the braking control command is triggered in any of the following scenarios:

[0175] The initial braking of the vehicle when switching from forward to reverse;

[0176] The vehicle brakes for the first time when it switches from reversing to moving forward.

[0177] Optionally, the motion parameters are determined as follows:

[0178] During vehicle braking, sensors acquire the motion parameters of the friction pads; or

[0179] During vehicle braking, the motion parameters of the friction pads are predicted by detecting the fit clearance between the friction pad backing plate protrusion and the caliper bracket sliding groove.

[0180] Optionally, the motion parameters include at least one of the displacement parameters of the friction pad and the sliding speed parameters; the preset parameter thresholds include at least one of the preset speed thresholds and the preset displacement thresholds.

[0181] The suppression start module 1003 is specifically used for:

[0182] If the motion parameters include the sliding speed parameter, then when the sliding speed parameter of the friction pad is detected to be greater than the preset speed threshold, the friction pad is driven to press against the brake disc in the first direction with the second pressure.

[0183] If the motion parameters include displacement parameters, then when the displacement parameter of the friction pad is detected to be greater than the preset displacement threshold, the friction pad is driven to press against the brake disc in the first direction with the second pressure.

[0184] When multiple sensors are mounted on the friction plate, the suppression start module 1003 is specifically used for:

[0185] It is determined that at least one of the motion parameters acquired by the multiple sensors installed on the friction plate is greater than a preset parameter threshold.

[0186] The sensor includes a first capacitor and a second capacitor, wherein the first capacitor is mounted on the upper plane of the caliper bracket guide rail, and the second capacitor is mounted on the upper plane of the protrusion on the friction plate back plate.

[0187] The suppression start module 1003 is used for:

[0188] By obtaining the distance between the first capacitor and the second capacitor, the displacement parameters corresponding to the friction plates can be determined.

[0189] The following reference Figure 11 To describe a computing device 1100 according to this embodiment of the present application. Figure 11 The computing device 1100 is merely an example and should not impose any limitations on the functionality and scope of use of the embodiments of this application.

[0190] like Figure 11 The computing device 1100 is manifested in the form of a general-purpose computing device. The components of the computing device 1100 may include, but are not limited to: at least one processing unit 1101, at least one storage unit 1102, and a bus 1103 connecting different system components (including storage unit 1102 and processing unit 1101).

[0191] Bus 1103 represents one or more of several bus structures, including a memory bus or memory controller, peripheral bus, processor, or local bus using any of the various bus structures.

[0192] Storage unit 1102 may include a readable medium in the form of volatile memory, such as random access memory (RAM) 1121 and / or cache memory 1122, and may further include read-only memory (ROM) 1123.

[0193] Storage unit 1102 may also include a program / utility 1125 having a set (at least one) of program modules 1124, such program modules 1124 including but not limited to: operating system, one or more application programs, other program modules and program data, each or some combination of these examples may include an implementation of a network environment.

[0194] The computing device 1100 can also communicate with one or more external devices 1104 (e.g., keyboard, pointing device, etc.), and with one or more devices that enable a user to interact with the computing device 1100, and / or with any device that enables the computing device 1100 to communicate with one or more other computing devices (e.g., router, modem, etc.). This communication can be performed via the input / output (I / O) interface 1105. Furthermore, the computing device 1100 can also communicate with one or more networks (e.g., local area network (LAN), wide area network (WAN), and / or public networks, such as the Internet) via the network adapter 1106. Figure 11 As shown, network adapter 1106 communicates with other modules for computing device 1100 via bus 1103. It should be understood that, although not shown in the figure, other hardware and / or software modules may be used in conjunction with computing device 1100, including but not limited to: microcode, device drivers, redundant processors, external disk drive arrays, RAID systems, tape drives, and data backup storage systems.

[0195] This application also provides a computer program product. The methods in this application can be implemented, in whole or in part, through software, hardware, firmware, or any combination thereof. When implemented using software, they can be implemented, in whole or in part, as a computer program product. The computer program product includes one or more computer programs or instructions. When the computer program or instructions are loaded and executed on a computer, the processes or functions described in this application are executed, in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, network equipment, user equipment, core network equipment, OAM, or other programmable devices.

[0196] A computer-readable storage medium can be an implementation of a computer program product. In other words, this application also provides a computer-readable storage medium that includes a computer program that, when executed by a processor, implements any of the braking noise control methods described above.

[0197] The computer program or instructions may be stored in a computer-readable storage medium or transferred from one computer-readable storage medium to another. For example, the computer program or instructions may be transferred from one website, computer, server, or data center to another website, computer, server, or data center via wired or wireless means. The computer-readable storage medium may be any available medium that a computer can access, or a data storage device such as a server or data center that integrates one or more available media. The available medium may be a magnetic medium, such as a floppy disk, hard disk, or magnetic tape; or an optical medium, such as a digital video optical disc; or a semiconductor medium, such as a solid-state drive. The computer-readable storage medium may be a volatile or non-volatile storage medium, or may include both volatile and non-volatile types of storage media.

[0198] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0199] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to this application. It should be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0200] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0201] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0202] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A control system for brake noise, characterized by, The system includes: a brake disc and a brake drive mechanism; The braking drive mechanism is configured to: receive a braking control command; respond to the braking control command by driving a friction pad to move toward the brake disc in a first direction with a first pressure and pressing it against the brake disc, the first direction being parallel to the axial direction of the brake disc; during the process of driving the friction pad to move, if the motion parameters include a sliding speed parameter, then when the sliding speed parameter of the friction pad is detected to be greater than a preset speed threshold, the friction pad is driven to press against the brake disc in the first direction with a second pressure; or if the motion parameters include a displacement parameter, then when the displacement parameter of the friction pad is detected to be greater than a preset displacement threshold, the friction pad is driven to press against the brake disc in the first direction with a second pressure; during the process of driving the friction pad to slide, if a noise suppression termination condition is met, then the friction pad is driven to press against the brake disc in the first direction with a third pressure. Wherein, the first pressure is greater than the second pressure; the third pressure is greater than the second pressure; the motion parameters are: obtained by sensors during vehicle braking; or predicted by detecting the mating clearance between the friction pad backing plate protrusion and the caliper bracket sliding groove during vehicle braking; The brake disc is used to drive the friction pad to slide in a second direction when it is pressed against the friction pad as the wheel rotates; wherein the second direction is the same as the circumferential direction of the brake disc.

2. The system of claim 1, wherein, The friction pad slides along the caliper bracket sliding groove in the second direction; the noise suppression termination condition includes at least one of the following: It was detected that, in the second direction, the mating clearance between the friction pad back plate protrusion and the caliper bracket sliding groove was less than a preset clearance. The second pressure was detected to drive the friction plate for a duration that reached a preset duration threshold. It was detected that the friction pad was driven by the second pressure, causing the sliding speed of the friction pad to decrease by a preset speed value.

3. The system of claim 1, wherein, The braking control command is triggered in any of the following scenarios: The initial braking of the vehicle when switching from forward to reverse; The vehicle's initial braking action, switching from reversing to moving forward.

4. The system of claim 1, wherein, When multiple sensors are mounted on the friction plate, the braking drive mechanism is used for: It is determined that at least one of the motion parameters acquired by the multiple sensors installed on the friction plate is greater than the preset parameter threshold.

5. The system of claim 1 or 4, wherein, The sensor includes a first capacitor and a second capacitor, wherein the first capacitor is mounted on the upper plane of the caliper bracket guide rail, and the second capacitor is mounted on the upper plane of the protrusion on the friction plate back plate. The braking drive mechanism is used for: By obtaining the distance between the first capacitor and the second capacitor, the displacement parameters corresponding to the friction pads are determined.

6. A control method of brake noise, characterized by, The method, applied to a brake drive mechanism in a braking system, includes: Receive braking control commands; In response to the braking control command, the friction pad is driven to move toward the brake disc in a first direction and press against the brake disc with a first pressure, the first direction being parallel to the axial direction of the brake disc; During the movement of the friction pad, if the motion parameters include a sliding speed parameter, then when the sliding speed parameter of the friction pad is detected to be greater than a preset speed threshold, the friction pad is driven to press against the brake disc in the first direction with a second pressure; or if the motion parameters include a displacement parameter, then when the displacement parameter of the friction pad is detected to be greater than a preset displacement threshold, the friction pad is driven to press against the brake disc in the first direction with a second pressure; during the sliding of the friction pad, if the noise suppression termination condition is met, then the friction pad is driven to press against the brake disc in the first direction with a third pressure. Wherein, the first pressure is greater than the second pressure; the third pressure is greater than the second pressure; the motion parameters are obtained by sensors during vehicle braking; or predicted by detecting the fit clearance between the friction pad backing plate protrusion and the caliper bracket sliding groove during vehicle braking; the brake disc is used to rotate with the wheel and, when pressed against the friction pad, drive the friction pad to slide in a second direction; wherein, the second direction is the same as the circumferential direction of the brake disc.

7. A vehicle, characterized in that, The vehicle includes a brake noise control system as described in any one of claims 1 to 5.

8. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by a processor, it implements the method as described in claim 6.

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