A method and system for evaluating pad wear in a brake pad design

Abstract

The present disclosure provides a brake friction plate design eccentric wear evaluation calculation method and system, relating to the technical field of automobiles, the method comprising: obtaining user driving brake pressure distribution data under each working condition in the life cycle of the vehicle; calculating brake friction under each working condition according to the user driving brake pressure distribution data; obtaining stiffness data of the connecting lug of the steering knuckle and the brake caliper, calculating the axial deformation of the lug of the steering knuckle according to the stiffness data, and evaluating the eccentric wear of the friction plate according to the calculated axial deformation. The present disclosure can avoid the eccentric wear of the friction plate from the design.

Description

Technical Field

[0001] This disclosure relates to the field of automotive technology, specifically to a method and system for calculating and evaluating wear bias in brake friction pad design. Background Technology

[0002] The statements in this section are merely background information relating to this disclosure and do not necessarily constitute prior art.

[0003] Brake pad wear refers to the gradual wear and tear that occurs during vehicle use. Brake pads, also known as brake discs, are consumables. When the wear reaches its limit, they must be replaced; otherwise, braking performance will be reduced, and it may even lead to brake failure and accidents.

[0004] Some vehicles display a warning light on the dashboard when brake pads are worn, reminding the driver to replace them promptly. New brake pads are typically around 1.5cm thick. If the wear is less than 5mm, replacement is recommended. Many other vehicles lack a brake pad wear warning light; however, the brake pads contain metal needles. When these needles wear down to a certain point, the brake disc will contact the needles, causing a screeching sound during braking. In such cases, immediate replacement is necessary. Brake pad wear is normal; as long as the wear is not severe and does not affect braking performance, continued driving is permitted.

[0005] However, this situation necessitates monitoring and calculating the uneven wear of the brake pads. Generally, this is done to verify or resolve uneven wear of the brake friction pads. This is usually achieved by physically testing the friction pad's slip resistance, optimizing the design of the brake caliper guide pin chain, and assessing the brake caliper drag torque, etc., to evaluate the uneven wear of the friction pads. However, this does not mean that the uneven wear problem can be avoided in the design of the friction pads. Existing methods cannot assess uneven wear of the friction pads from the design source and thus avoid it. Summary of the Invention

[0006] To address the aforementioned issues, this disclosure proposes a method and system for evaluating and calculating uneven wear in brake friction pad design. Under the braking pressure commonly used by the user, the friction force of the brake is calculated, and then the axial deformation of the steering knuckle lug is calculated based on the stiffness of the connecting lug between the steering knuckle and the brake caliper. This analysis reveals the impact on uneven wear of the friction pad from a design perspective.

[0007] According to some embodiments, the present disclosure adopts the following technical solutions:

[0008] A method for calculating and evaluating wear patterns in brake friction pad design includes:

[0009] Throughout the vehicle's lifecycle, acquire data on the distribution of user driving braking pressure under various operating conditions;

[0010] Calculate the braking friction force under various operating conditions based on user driving braking pressure distribution data;

[0011] Obtain the stiffness data of the connecting lugs between the steering knuckle and the brake caliper, calculate the axial deformation of the steering knuckle lugs based on the stiffness data, and evaluate the uneven wear of the friction pads based on the calculated axial deformation.

[0012] Furthermore, the braking conditions include a first braking condition and a second braking condition. The braking pressure of the first braking condition is 0 to 5.39 MPa, and the braking pressure of the second braking condition is 5.4 to 9.49 MPa.

[0013] Furthermore, based on the user's driving brake pressure distribution data, the braking friction force under various operating conditions is calculated as follows:

[0014] F = n × π × (d / 2) 2 ×P×2×μ

[0015] Where F is the brake friction force, n is the number of wheel cylinders, d is the wheel cylinder diameter, P is the maximum hydraulic pressure, and μ is the coefficient of friction.

[0016] Furthermore, when calculating the axial deformation of the steering knuckle lug, the maximum pressure value of the braking pressure range under each operating condition is used.

[0017] Furthermore, the braking pressure is selected as 5.39 MPa under the first braking condition and 9.49 MPa under the second braking condition.

[0018] Furthermore, the axial deformation of the steering knuckle lug is calculated as follows:

[0019] ▲ L = (F × A) / (B × K)

[0020] Where ▲L is the axial deformation of the lug, A is the distance from the center surface of the brake disc to the mounting surface of the lug, B is the center hole distance of the lug, and K is the lug stiffness.

[0021] Furthermore, based on the proportion of vehicle usage under each working condition and the calculated maximum axial deformation of the steering knuckle lug under maximum pressure, the influence of the axial deformation of the steering knuckle lug on the uneven wear of the friction pads is analyzed.

[0022] According to some embodiments, the present disclosure adopts the following technical solutions:

[0023] A brake friction pad design wear assessment calculation system includes:

[0024] The data acquisition module is used to acquire user driving braking pressure distribution data under various operating conditions throughout the vehicle's life cycle.

[0025] The calculation and evaluation module is used to calculate the braking friction force under various operating conditions based on the user's driving braking pressure distribution data; obtain the stiffness data of the connecting lugs between the steering knuckle and the brake caliper; calculate the axial deformation of the steering knuckle lugs based on the stiffness data; and evaluate the wear of the friction pads based on the calculated axial deformation.

[0026] According to some embodiments, the present disclosure adopts the following technical solutions:

[0027] A non-transitory computer-readable storage medium is provided for storing computer instructions, which, when executed by a processor, implement the aforementioned method for calculating wear assessment during brake friction pad design.

[0028] According to some embodiments, the present disclosure adopts the following technical solutions:

[0029] An electronic device includes a processor, a memory, and a computer program; wherein the processor is connected to the memory, the computer program is stored in the memory, and when the electronic device is running, the processor executes the computer program stored in the memory to enable the electronic device to implement the aforementioned method for calculating wear assessment during brake friction pad design.

[0030] Compared with the prior art, the beneficial effects of this disclosure are as follows:

[0031] This disclosure provides a method and system for evaluating and calculating uneven wear in brake friction pad design. The friction force of the brake is calculated under the braking pressure commonly used by the user. Then, the axial deformation of the steering knuckle lug is calculated based on the stiffness of the connecting lug between the steering knuckle and the brake caliper. The influence on uneven wear of the friction pad is analyzed from the design perspective, thereby reducing the risk of uneven wear of the friction pad from the design stage. Attached Figure Description

[0032] The accompanying drawings, which form part of this disclosure, are used to provide a further understanding of this disclosure. The illustrative embodiments of this disclosure and their descriptions are used to explain this disclosure and do not constitute an undue limitation of this disclosure.

[0033] Figure 1 This refers to the distance from the center surface of the brake disc to the mounting surface of the lug in this embodiment of the present disclosure.

[0034] Figure 2 The center hole distance of the support lugs in this embodiment of the present disclosure is denoted as . Detailed Implementation

[0035] The present disclosure will be further described below with reference to the accompanying drawings and embodiments.

[0036] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this disclosure. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains.

[0037] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this disclosure. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms “comprising” and / or “including” are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0038] Example 1

[0039] One embodiment of this disclosure provides a method for calculating and evaluating wear bias in brake friction pad design, including:

[0040] Throughout the vehicle's lifecycle, acquire data on the distribution of user driving braking pressure under various operating conditions;

[0041] Calculate the braking friction force under various operating conditions based on user driving braking pressure distribution data;

[0042] Obtain the stiffness data of the connecting lugs between the steering knuckle and the brake caliper, calculate the axial deformation of the steering knuckle lugs based on the stiffness data, and evaluate the uneven wear of the friction pads based on the calculated axial deformation.

[0043] As one embodiment, the specific implementation method of the brake friction pad design wear assessment calculation method disclosed in this invention is as follows:

[0044] Step 1: Acquire user driving braking pressure distribution data under various operating conditions throughout the vehicle's lifecycle;

[0045] The operating condition refers to the distribution of brake hydraulic pressure used by the user, with brake hydraulic pressure ranging from 0 to 5.39 MPa and from 5.4 to 9.49 MPa.

[0046] Step 2: Calculate the braking friction force under various operating conditions based on the user's driving braking pressure distribution data;

[0047] Step 3: Obtain the stiffness data of the connecting lugs between the steering knuckle and the brake caliper, calculate the axial deformation of the steering knuckle lugs based on the stiffness data, and evaluate the wear of the friction pads based on the calculated axial deformation.

[0048] As one embodiment, the braking conditions include a first braking condition and a second braking condition. The braking pressure of the first braking condition is 0 to 5.39 MPa, and the braking pressure of the second braking condition is 5.4 to 9.49 MPa.

[0049] As shown in Table 1 below, the distribution of user-driven braking pressure during the vehicle's lifespan.

[0050] Table 1 Distribution of Braking Pressure During User Driving

[0051] Braking conditions Braking pressure (MPa) Operating conditions ratio 1 0～5.39 95.25％ 2 5.4～9.49 3.03％

[0052] Substituting the steering knuckle stiffness and brake friction, calculate the axial deformation of the brake caliper connecting to the steering knuckle lug. The calculation method is as follows:

[0053] Based on the user's driving brake pressure distribution data, the braking friction force under various operating conditions is calculated as follows:

[0054] F = n × π × (d / 2) 2 ×P×2×μ

[0055] Where F is the brake friction force, n is the number of wheel cylinders, d is the wheel cylinder diameter, P is the maximum hydraulic pressure, and μ is the coefficient of friction.

[0056] The axial deformation of the steering knuckle lug is calculated as follows:

[0057] ▲ L = (F × A) / (B × K)

[0058] Where ▲L is the axial deformation of the lug, A is the distance from the center surface of the brake disc to the mounting surface of the lug, B is the center hole distance of the lug, and K is the lug stiffness.

[0059] During braking, the friction pads generate a tangential frictional torque along the brake disc. The axial force generated by this torque is applied to the two lugs of the steering knuckle, causing them to deform to varying degrees. Since both lugs connect to the brake caliper, the uneven wear between the friction pads and the brake disc is caused by the caliper deforming along with the lugs. Therefore, calculating the axial deformation of the steering knuckle lugs to assess uneven friction pad wear can reduce the risk of such wear during the design phase.

[0060] Based on the proportion of vehicle usage under each working condition and the calculated maximum axial deformation of the steering knuckle lug under maximum pressure, the influence of the axial deformation of the steering knuckle lug on the uneven wear of the friction pad is analyzed.

[0061] As one example, when calculating the axial deformation of the steering knuckle lug, the maximum pressure value of the braking pressure range under various operating conditions is used.

[0062] Therefore, the braking pressure is selected as 5.39 MPa under the first braking condition and 9.49 MPa under the second braking condition.

[0063] Furthermore, for operating condition 1: 5.39 MPa; and operating condition 2: 9.49 MPa, the braking friction coefficient for each operating condition is: Operating condition 1: F1 = n × π × (d / 2) 2 ×P1×2×μ

[0064] = 2 × 3.14 × (45 / 2) 2 ×5.39×2×0.38

[0065] =13030N

[0066] Working condition 2: F2 = n × π × (d / 2) 2 ×P1×2×μ

[0067] = 2 × 3.14 × (45 / 2) 2 ×9.49×2×0.38

[0068] =22942N

[0069] Furthermore, the axial deformation of the steering knuckle lug is calculated as follows:

[0070] Operating Condition 1: ▲L 1u =(F1×A) / (B×K1)

[0071] = (13030 × 34.2) / (140 × 213680)

[0072] =0.015mm

[0073] ▲L 1L = (F1×A) / (B×K2)

[0074] = (13030 × 34.2) / (140 × 143880)

[0075] =0.022mm

[0076] Operating Condition 2: ▲L 2u = (F2×A) / (B×K1)

[0077] = (22942 × 34.2) / (140 × 213680)

[0078] =0.026mm

[0079] ▲L 2L = (F2×A) / (B×K2)

[0080] = (22942 × 34.2) / (140 × 143880)

[0081] =0.039mm

[0082] Among them, ▲L 1u , ▲L1L , ▲L 2u , ▲L 2L These represent the axial deformation of the support lugs under various working conditions, A: 34.2mm

[0083] B: 140mm

[0084] K1: Lug stiffness 213680 N / mm

[0085] K2: Lug stiffness 143880 N / mm

[0086] Based on the above calculations, the maximum deformation of the bearing lug under maximum pressure is 0.022 for condition 1, which occupies 95.25% of the vehicle's operating condition; and the maximum deformation of the bearing lug under maximum pressure is 0.039 for condition 2, which occupies 3.03% of the vehicle's operating condition. The analysis shows that the axial deformation of the two bearing lugs has little impact on the uneven wear of the friction plate.

[0087] Example 2

[0088] One embodiment of this disclosure provides a brake friction pad design wear assessment calculation system, including:

[0089] The data acquisition module is used to acquire user driving braking pressure distribution data under various operating conditions throughout the vehicle's life cycle.

[0090] The calculation and evaluation module is used to calculate the braking friction force under various operating conditions based on the user's driving braking pressure distribution data; obtain the stiffness data of the connecting lugs between the steering knuckle and the brake caliper; calculate the axial deformation of the steering knuckle lugs based on the stiffness data; and evaluate the wear of the friction pads based on the calculated axial deformation.

[0091] Example 3

[0092] One embodiment of this disclosure provides a non-transitory computer-readable storage medium for storing computer instructions, which, when executed by a processor, implement the aforementioned method for calculating wear assessment during brake friction pad design.

[0093] Example 4

[0094] An electronic device includes a processor, a memory, and a computer program; wherein the processor is connected to the memory, the computer program is stored in the memory, and when the electronic device is running, the processor executes the computer program stored in the memory to enable the electronic device to implement the aforementioned method for calculating wear assessment during brake friction pad design.

[0095] This disclosure is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this disclosure. It will 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, create a machine for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0096] 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.

[0097] While the specific embodiments of this disclosure have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of this disclosure. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of this disclosure are still within the scope of protection of this disclosure.

Claims

1. A method for calculating and evaluating wear patterns in brake friction pad design, characterized in that, include: Throughout the vehicle's lifecycle, acquire data on the distribution of user driving braking pressure under various operating conditions; Calculate the braking friction force under various operating conditions based on user driving braking pressure distribution data; Based on the user's driving brake pressure distribution data, the braking friction force under various operating conditions is calculated as follows: F= n× ×(d / 2) 2 ×P×2× Where F is the brake friction force, n is the number of wheel cylinders, d is the wheel cylinder diameter, and P is the maximum hydraulic pressure. The coefficient of friction; Obtain the stiffness data of the connecting lugs between the steering knuckle and the brake caliper, calculate the axial deformation of the steering knuckle lugs based on the stiffness data, and evaluate the wear of the friction pads based on the calculated axial deformation. The axial deformation of the steering knuckle lug is calculated as follows: ▲L=(F×A) / (B×K) Where, ▲L is the axial deformation of the lug, A is the distance from the center surface of the brake disc to the mounting surface of the lug, B is the center hole distance of the lug, and K is the lug stiffness. Based on the proportion of vehicle usage under each working condition and the calculated maximum axial deformation of the steering knuckle lug under maximum pressure, the influence of the axial deformation of the steering knuckle lug on the uneven wear of the friction pad is analyzed.

2. The method for evaluating and calculating wear patterns in brake friction pad design as described in claim 1, characterized in that, The braking conditions include a first braking condition and a second braking condition. The braking pressure for the first braking condition is 0~5.39MPa, and the braking pressure for the second braking condition is 5.4~9.49MPa.

3. The method for evaluating and calculating wear bias in brake friction pad design as described in claim 1, characterized in that, When calculating the axial deformation of the steering knuckle lug, the maximum pressure value of the braking pressure range under each working condition is used.

4. The method for evaluating and calculating wear bias in brake friction pad design as described in claim 3, characterized in that, The braking pressure is selected as 5.39 MPa under the first braking condition and 9.49 MPa under the second braking condition.

5. A brake friction pad design wear assessment calculation system, employing the brake friction pad design wear assessment calculation method as described in any one of claims 1-4, characterized in that, include: The data acquisition module is used to acquire user driving braking pressure distribution data under various operating conditions throughout the vehicle's life cycle. The calculation and evaluation module is used to calculate the braking friction force under various operating conditions based on the user's driving braking pressure distribution data; obtain the stiffness data of the connecting lugs between the steering knuckle and the brake caliper; calculate the axial deformation of the steering knuckle lugs based on the stiffness data; and evaluate the wear of the friction pads based on the calculated axial deformation.

6. A non-transitory computer-readable storage medium, characterized in that, The non-transitory computer-readable storage medium is used to store computer instructions, which, when executed by a processor, implement a method for calculating wear assessment during brake friction pad design as described in any one of claims 1-4.

7. An electronic device, characterized in that, include: The device includes a processor, a memory, and a computer program; wherein the processor is connected to the memory, the computer program is stored in the memory, and when the electronic device is running, the processor executes the computer program stored in the memory to enable the electronic device to perform a method for calculating wear assessment during brake friction pad design as described in any one of claims 1-4.

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