Device and method for testing performance of brake calipers

Abstract

The invention discloses performance test equipment for brake calipers, and the equipment comprises a data collection assembly which is used for collecting the stroke data of a brake pedal and the pressure data of the brake calipers in a brake test of a vehicle; the data transmission assembly is connected with the data acquisition assembly and used for sending the stroke data and the pressure data to an upper computer through a CAN card; the upper computer is connected with the data transmission assembly and used for generating a P-V relation curve used for determining the performance of the brake calipers on the basis of the stroke data and the pressure data, P represents the pressure of the calipers when the vehicle is braked, and V represents the brake liquid demand amount. Meanwhile, the invention further discloses a performance testing method of the brake calipers.

Description

Technical Field

[0001] This application relates to the field of vehicle braking, and particularly to a performance testing device and method for a brake caliper. Background Art

[0002] The P-V relationship curve (Pressure-Volume Curve) plays a crucial role in determining the performance of a brake caliper. The P-V relationship curve reflects the amount of brake fluid required by the brake caliper at different pressures, that is, this curve indicates how much volume needs to be replenished to establish a certain pressure in the wheel cylinder. This curve is very important for the design and optimization of the braking system because it directly affects the performance and stability of the braking system. However, the devices for testing the performance of brake calipers in the prior art are expensive and bulky. Summary of the Invention

[0003] In view of this, embodiments of this application are expected to provide a performance testing device and method for a brake caliper to at least solve the above technical problems.

[0004] To achieve the above object, the technical solution of this application is realized as follows:

[0005] According to one aspect of the embodiments of this application, a performance testing device for a brake caliper is provided, and the device includes:

[0006] A data acquisition component, configured to acquire the stroke data of the brake pedal and the pressure data of the brake caliper during the braking test of the vehicle;

[0007] A data transmission component, connected to the data acquisition component, and configured to send the stroke data and the pressure data to the host computer through a CAN card;

[0008] A host computer, connected to the data transmission component, and configured to generate a P-V relationship curve for determining the performance of the brake caliper based on the stroke data and the pressure data, where P represents the caliper pressure during vehicle braking, and V represents the required brake fluid volume.

[0009] In the above solution, the device further includes:

[0010] A CAN card, with one end connected to the data transmission component and the other end connected to the host computer, for realizing data communication between the data transmission component and the host computer.

[0011] In the above solution, the data acquisition component includes:

[0012] A pressure sensor, installed on the brake caliper, for acquiring the pressure data and sending the pressure data to the data transmission component;

[0013] A displacement sensor is installed vertically above the brake pedal and is used to collect the stroke data and send the stroke data to the data transmission component.

[0014] In the above solution, the host computer is further configured to send a control instruction to the data transmission component through the CAN card;

[0015] The data transmission component is further configured to send the pressure data of the target brake caliper to the host computer based on the control instruction, where the target brake caliper is a brake caliper on one wheel or brake calipers on multiple wheels.

[0016] In the above solution, the host computer includes:

[0017] A data acquisition module, configured to acquire the inner diameter data of the vehicle master cylinder block;

[0018] A data processing module, connected to the data acquisition module, and configured to obtain the required brake fluid volume based on the inner diameter data and the stroke data.

[0019] In the above solution, the data processing module is further configured to calculate the cross-sectional area of the master cylinder block based on the inner diameter data, and multiply the cross-sectional area by the stroke data to obtain the required brake fluid volume.

[0020] In the above solution, the data acquisition component is further configured to collect at least two sets of stroke data of the brake pedal and pressure data of the brake caliper for the same wheel during the brake test of the vehicle;

[0021] The data transmission component is configured to send the two sets of stroke data and the pressure data to the host computer through the CAN card;

[0022] The host computer is configured to generate a P-V relationship curve of the brake caliper after averaging the two sets of stroke data and the pressure data.

[0023] In the above solution, the data transmission component includes a plurality of signal transmission ports and a power supply port. Among them, the data acquisition component and the CAN card are respectively connected to the data transmission component through the corresponding signal transmission ports; the power supply port is used to provide electrical energy for the data transmission component.

[0024] According to another aspect of the present application, a method for testing the performance of a brake caliper is provided, characterized in that the method includes:

[0025] During the brake test of the vehicle, collect the stroke data of the brake pedal and the pressure data of the brake caliper through the data acquisition component;

[0026] Send the travel data and the pressure data to the host computer through the CAN card;

[0027] Process the travel data and the pressure data through the host computer to generate a P-V relationship curve for determining the performance of the brake caliper, where P represents the caliper pressure during vehicle braking, and V represents the required liquid volume for braking.

[0028] In the above solution, before sending the travel data and the pressure data to the host computer through the CAN card, the method further includes:

[0029] Receive a control instruction from the host computer through the CAN card;

[0030] Send the travel data of the brake pedal and at least two sets of pressure data for the same brake caliper to the host computer based on the control instruction;

[0031] After processing the travel data and at least two sets of the pressure data through the host computer, generate a P-V relationship curve for determining the performance of the brake caliper.

[0032] The performance test equipment and method for the brake caliper provided by this application test the performance of the brake caliper through a device composed of a data acquisition component, a data transmission component, and a host computer, which not only reduces the equipment cost but also has high test efficiency. Description of the Drawings

[0033] Figure 1 Schematic diagram of the structural composition of the performance test equipment for the brake caliper in this application Figure 1 ;

[0034] Figure 2 Schematic diagram of the structural composition of the performance test equipment for the brake caliper in this application Figure 2 ;

[0035] Figure 3 Schematic diagram of the process implementation of the performance test method for the brake caliper in this application. Detailed Description of the Invention

[0036] The technical solutions of this application will be further elaborated in detail below in conjunction with the accompanying drawings of the specification and specific embodiments.

[0037] For the various specific technical features in each of the embodiments described in the detailed description, without conflict, various combinations can be made. For example, different embodiments can be formed through combinations of different specific technical features. To avoid unnecessary repetition, various possible combination methods of the various specific technical features in this application will not be described separately.

[0038] It should be noted that the terms "first / second / third" involved in the embodiments of the present application are only used to distinguish similar objects, and do not represent a specific order for the objects. It can be understood that "first / second / third" can be interchanged in a specific order or sequence when allowed. It should be understood that the objects distinguished by "first / second / third" can be interchanged under appropriate circumstances, so that the embodiments of the present application described here can be implemented in an order other than those illustrated or described here.

[0039] Figure 1 Schematic diagram of the structural composition of the performance test equipment for the brake caliper in the present application Figure 1 , such as Figure 1 shown, the equipment includes: a data acquisition component 10, a data transmission component 20, and a host computer 30. Among them, the data acquisition component is used to collect the stroke data of the brake pedal and the pressure data of the brake caliper during the braking test of the vehicle; the data transmission component 20 is connected to the data acquisition component 10 and is used to send the collected stroke data and pressure data to the host computer 30 through a CAN card; the host computer 30 is connected to the data transmission component 20 and is used to generate a P-V relationship curve for determining the performance of the brake caliper based on the stroke data and the pressure data, where P represents the caliper pressure during vehicle braking, and V represents the required brake fluid volume.

[0040] Here, the form of the CAN card is not limited. It can be built into the data transmission component 20 or the host computer 30, or exist independently.

[0041] Here, the P-V relationship of the brake caliper is the relationship between the caliper braking force and the required brake fluid volume during service braking. This P-V relationship directly affects the matching relationship between the components in the braking system and is also the most important influencing factor for the vehicle brake pedal. Since during the service braking process of the vehicle, the brake caliper is usually driven to contact the brake disc through a hydraulic method to achieve braking, and the consumption and wear of the brake caliper mainly occur during stroke braking, it is necessary to regularly test the P-V performance of the brake caliper to ensure the normal driving and driving safety of the vehicle. By testing the P-V performance of the brake caliper with the test equipment provided by the present application, not only is the equipment cost low, but also the test effect is relatively accurate.

[0042] During hydraulic braking in the present application, a brake motor is used to drive the piston in the brake cylinder to move, and the piston is used to push the brake fluid in the brake cylinder. At this time, the stroke of the brake motor is the displacement of the piston. When the inner diameter of the brake cylinder is determined, the volume of the brake fluid compressed and pushed can be calculated according to the stroke of the brake motor and the inner diameter of the brake cylinder. This volume is the brake fluid storage volume, that is, the V value in the P-V relationship curve.

[0043] Therefore, the host computer 30 in the present application may include: a data acquisition module 301 and a data processing module 302. Among them, the data acquisition module 301 is used to acquire the inner diameter data of the vehicle master cylinder block; the data processing module 302 is connected to the data acquisition module 301 and is used to calculate the cross-sectional area of the master cylinder block based on the inner diameter data, and then multiply the cross-sectional area by the stroke data to obtain the required brake fluid volume.

[0044] Here, the acquisition method of the inner diameter data of the vehicle master cylinder block is not limited. It can be obtained through manual input or through automatic acquisition.

[0045] During the braking process of the present application, the driver steps on the brake pedal. The brake motor in the hydraulic system drives the piston, and through the brake fluid, it pushes the brake caliper to move, so that the friction pads are in contact with the brake disc and tightly clamp the brake disc. This acting pressure is the caliper pressure, that is, the P value in the P-V relationship curve.

[0046] In the present application, the data acquisition component 10 may include: a pressure sensor 101 and a displacement sensor 102. Among them, the pressure sensor 101 is installed on the brake caliper and is used to collect the pressure data of the brake caliper and can send the pressure data to the data transmission component 20; the displacement sensor 102 is installed vertically above the brake pedal and is used to collect the stroke data of the brake pedal and can send the stroke data to the data transmission component 20.

[0047] In the present application, the data transmission component 20, the pressure sensor 101, and the displacement sensor 102 can all be vehicle-built components or vehicle-external components, and can be specifically set according to actual test requirements.

[0048] By using the test equipment provided by the present application to test the PV performance of the brake caliper, not only can the equipment cost be reduced, but also the equipment occupies a small space, is convenient to move and use, and can also improve the test efficiency.

[0049] Figure 2 Schematic diagram of the structural composition of the performance test equipment for the brake caliper in the present application Figure 2 , such as Figure 2As shown, the device includes: a data acquisition component 10, a data transmission component 20, a host computer 30, and a CAN card 40. Among them, the data acquisition component is used to collect the stroke data of the brake pedal and the pressure data of the brake caliper during the braking test of the vehicle; the data transmission component 20 is connected to the data acquisition component 10 and is used to receive the stroke data and the pressure data sent from the data acquisition component 10; one end of the CAN card 40 is connected to the data transmission component 20, and the other end is connected to the host computer 30, which is used to realize the data communication between the data transmission component and the host computer 30. After integrating the stroke data and the pressure data, the data transmission component 20 sends them to the CAN card 40, and the CAN card 40 then sends them to the host computer 30 through the CAN bus; based on the stroke data and the pressure data, the host computer 30 generates a P-V relationship curve for determining the performance of the brake caliper, where P represents the caliper pressure during vehicle braking, and V represents the required brake fluid volume.

[0050] In the present application Figure 1 and Figure 2 the host computer 30 may include: a data acquisition module 301 and a data processing module 302. Among them, the data acquisition module 301 is used to acquire the inner diameter data of the master cylinder block of the vehicle; the data processing module 302 is connected to the data acquisition module 301 and is used to obtain the required brake fluid volume based on the inner diameter data and the stroke data.

[0051] Here, the data processing module 302 may specifically calculate the cross-sectional area of the master cylinder block based on the inner diameter data, and then multiply the cross-sectional area by the stroke data to obtain the volume of the brake fluid compressed and pushed, and this volume is the brake fluid storage volume.

[0052] After obtaining the P values and V values of the brake caliper at different times, the host computer 30 generates a P-V relationship curve graph of the brake caliper with the P values and V values at each time, and outputs it through a display component (not shown in the figure).

[0053] Here, the display component is not limited. The display component may be the display screen of the host computer 30 itself, or other display screens connected to the host computer 30.

[0054] Combined with the Figure 1 and Figure 2 in the present application, the host computer 30 may also send a control instruction to the data transmission component 20 through the CAN card; based on the control instruction, the data transmission component 20 may send the pressure data of the target brake caliper to the host computer 30.

[0055] Here, the target brake caliper may be the brake caliper of one wheel on the vehicle, or the brake calipers of multiple wheels on the vehicle.

[0056] In the present applicationFigure 1 and Figure 2 In Figure 2 , the data transmission component 20 may include a plurality of signal transmission ports 201 and a power supply port 202. Among them, the data acquisition component 10 and the CAN card 40 can be respectively connected to the data transmission component 20 through the corresponding signal transmission ports 201; the power supply port 202 is used to supply electrical energy to the data transmission component 20.

[0057] For example, the data transmission component 20 includes a signal transmission port 201A, a signal transmission port 201B, a signal transmission port 201C, a signal transmission port 201D, and a signal transmission port 201E; when the test vehicle is a four-wheel vehicle, the left front wheel is connected to the signal transmission port 201A, the right front wheel is connected to the signal transmission port 201B, the left rear wheel is connected to the signal transmission port 201C, the right rear wheel is connected to the signal transmission port 201D, and the CAN card is connected to the signal transmission port 201E.

[0058] In an implementation solution of the present application, pressure sensors 101 are respectively installed on the four wheels. Through the pressure sensors 101, the pressure data of the brake calipers on the corresponding wheels can be collected, and the collected pressure data can be sent to the data transmission component 20 through the corresponding signal transmission ports 201. The data transmission component 20 sends the pressure data of the target brake caliper to the host computer 30 based on the control instruction sent by the host computer 30.

[0059] Here, the control instruction may carry a caliper identifier. If the caliper identifier represents the left front wheel, the data transmission component 20 sends the caliper pressure data of the left front wheel to the host computer 30; if the caliper identifier represents the left rear wheel and the right rear wheel, the data transmission component 20 sends the caliper pressure data of the coaxial left rear wheel and right rear wheel to the host computer 30.

[0060] In another implementation solution of the present application, the host computer 30 may send a liquid inlet valve closing instruction to the electronic stability control system (ESC, Electronic Stability Control) of the vehicle. The ESC can close the liquid inlet valve of the target wheel on the vehicle based on the liquid inlet valve closing instruction. At this time, the pressure data of the brake caliper with the closed liquid inlet valve is 0. Thus, the data acquisition component 10 can only collect the pressure data of the brake calipers with the unclosed liquid inlet valve, and the data transmission component 20 only sends the pressure data of the brake calipers with the unclosed liquid inlet valve to the host computer through the CAN card.

[0061] Combined with the Figure 1 and Figure 2, in the braking test of the vehicle, the data acquisition component 10 can also collect at least two sets of travel data of the brake pedal and pressure data of the brake caliper for the same wheel; the data transmission component 20 can send the two sets of travel data and the pressure data to the host computer 30 through the CAN bus of the CAN card 40; after averaging the two sets of travel data and the pressure data, the host computer 30 can generate the P-V relationship curve of the brake caliper.

[0062] For example, in the case of only testing the PV characteristics of the brake caliper of the left front wheel of the vehicle, two sets of travel data of the brake pedal and two sets of pressure data of the brake caliper can be collected for the left front wheel, and each set of pressure data ranges from 0 to the maximum pressure value (such as 1000 PSI). After averaging the two sets of travel data and the two sets of pressure data, the host computer 30 outputs the P-V relationship curve representing the brake caliper of the left front wheel.

[0063] For another example, in the case of testing the PV characteristics of the brake calipers of the left rear wheel and the right rear wheel on the same axle of the vehicle, two sets of travel data of the brake pedal and two sets of pressure data of the brake caliper can be collected for the left rear wheel and the right rear wheel respectively, and each set of pressure data ranges from 0 to the maximum pressure value (such as 1000 PSI). After averaging the two sets of travel data and the two sets of pressure data, the host computer 30 outputs the P-V relationship curve representing the brake calipers of the left rear wheel and the right rear wheel.

[0064] By collecting multiple sets of travel data and pressure data of the brake caliper for the same vehicle in this application, the test accuracy of the P-V characteristics of the brake caliper can be improved.

[0065] The characteristic test equipment for the brake caliper provided by this application has a simple structure and a low price, greatly reducing the use cost of the equipment, and having a high test efficiency.

[0066] Figure 3 It is a schematic diagram for realizing the performance test method of the brake caliper in this application. As Figure 3 shown, the method includes:

[0067] Step 100, in the braking test of the vehicle, collect the travel data of the brake pedal and the pressure data of the brake caliper through the data acquisition component;

[0068] Step 200, send the travel data and the pressure data to the host computer through the CAN card;

[0069] Step 300, perform data processing on the travel data and the pressure data through the host computer to generate a P-V relationship curve for determining the performance of the brake caliper, where P represents the caliper pressure during vehicle braking, and V represents the required liquid volume for braking.

[0070] In a preferred solution, before sending the stroke data and the pressure data to the host computer through the CAN card, the method further includes:

[0071] Receiving a control instruction from the host computer through the CAN card;

[0072] Based on the control instruction, sending the stroke data of the brake pedal and at least two groups of pressure data for the same brake caliper to the host computer;

[0073] After the host computer processes the stroke data and at least two groups of the pressure data, a P-V relationship curve for determining the performance of the brake caliper is generated.

[0074] Here, during hydraulic braking, the brake motor is triggered by the brake pedal to drive the piston in the vehicle master cylinder to move. The brake fluid in the master cylinder is pushed by the piston. At this time, the stroke of the brake pedal is the displacement of the piston. When the inner diameter of the vehicle master cylinder is determined, the volume of the brake fluid compressed and pushed can be calculated according to the stroke of the brake pedal and the inner diameter of the master cylinder. Specifically, the cross-sectional area of the master cylinder is calculated through the inner diameter of the master cylinder, and the volume can be obtained by multiplying the cross-sectional area by the stroke of the brake pedal. In this application, the stroke of the brake pedal is collected by a displacement sensor, and this volume is the brake fluid storage volume, that is, the V value in the PV curve.

[0075] For the acquisition of the caliper pressure, the brake motor drives the piston, and the brake fluid is used to drive the caliper to move, so as to drive the friction plate to contact the brake disc. Then, during hydraulic braking, the acting pressure between the friction plate and the brake disc needs to be controlled, and this acting pressure is the caliper pressure. In this application, the caliper pressure is detected and collected by a pressure sensor, that is, the P value in the PV curve.

[0076] The test process of the brake caliper in this application can be as follows:

[0077] Taking a four-wheel vehicle as an example, first, the vehicle brake is run-in. A three-way valve is installed between the brake caliper hoses and hard pipes of the four wheels of the vehicle. Then, a pressure sensor is assembled on the three-way valve, and the pressure sensor is connected to the data transmission component. Here, the pressure data in the pressure sensor needs to be emptied. Then, a displacement sensor is installed vertically above the brake pedal and zeroed. This displacement sensor can be a wire-pulling stroke sensor, with one end fixed on the tooling and the other end fixed on the brake pedal, and the displacement sensor is connected to the data transmission component.

[0078] For example, the data transmission component includes signal transmission ports CH1, CH2, CH3, CH4, and CH5. Among them, CH1 corresponds to LF (left front wheel), CH2 corresponds to RF (right front wheel), CH3 corresponds to LR (left rear wheel), CH4 corresponds to RR (right rear wheel), and CH5 corresponds to the displacement sensor.

[0079] Next, power on the vehicle (the vacuum booster needs to have the vacuum tube unplugged, and the electric power steering booster needs to be powered off), quickly step on the brake pedal multiple times to exhaust the remaining vacuum and ensure that the vehicle is in a non-assisted state; turn on the upper computer on the computer and connect it to the data transmission component through the CAN card; connect the data transmission component to the power supply.

[0080] Then, the upper computer starts data recording. Slowly step on the brake pedal and observe the pressure value of the brake caliper displayed on the upper computer. When the pressure value rises above 1000 PSI, release the brake pedal and end the data recording on the upper computer.

[0081] Here, two sets of pressure data and the stroke data of the brake pedal can be collected for the same brake caliper to improve the accuracy of the PV performance test for the brake caliper.

[0082] Next, the upper computer calculates the volume in the master cylinder (i.e., the required brake fluid volume, the V value in the PV relationship) based on the recorded stroke data and the inner diameter data of the master cylinder block, and generates a PV relationship curve for the brake caliper based on the pressure value of the brake caliper (i.e., the P value in the PV relationship) and the required brake fluid volume in the master cylinder.

[0083] The test method provided by this application can not only test the PV performance of the caliper of a single wheel, but also test the PV performance of the calipers of multiple wheels, which can meet the usage under different requirements. Moreover, the test equipment used has a simple and convenient structure, greatly reducing the equipment cost and material loss.

[0084] It should be noted that the performance test of the brake caliper provided in the above embodiment and the Figure 1 and Figure 2 performance test equipment of the brake caliper provided belong to the same concept. The specific implementation process can refer to the above equipment embodiment and will not be elaborated here.

[0085] In several embodiments provided by this application, it should be understood that the disclosed equipment and methods can be implemented in other ways. The above-described equipment embodiments are merely illustrative. In addition, the features disclosed in several method or equipment embodiments provided by this application can be combined arbitrarily without conflict to obtain new method embodiments or equipment embodiments.

[0086] As described above, it is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of changes or substitutions, which should all be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claimed rights.

Claims

1. A performance test device for a brake caliper, characterized in that: The device comprises: A data acquisition component, used to collect brake pedal travel data and brake caliper pressure data during a vehicle brake test; A data transmission component, connected to the data acquisition component, for sending the travel data and the pressure data to a host computer via a CAN card; A host computer is connected to the data transmission component and is used to generate a PV relationship curve for determining the performance of the brake caliper based on the travel data and the pressure data, wherein P represents the caliper pressure when the vehicle brakes, and V represents the required brake fluid volume.

2. The device according to claim 1, characterized in that The device also includes: A CAN card, one end of which is connected to the data transmission component and the other end of which is connected to the host computer, is used to realize data communication between the data transmission component and the host computer.

3. The device according to claim 1, characterized in that The data acquisition component comprises: A pressure sensor, mounted on the brake caliper, for collecting the pressure data and sending the pressure data to the data transmission component; A displacement sensor is installed vertically above the brake pedal and is used to collect the travel data and send the travel data to the data transmission component.

4. The method according to claim 1 or 2, characterized in that: The host computer is also used to send control instructions to the data transmission component through the CAN card; The data transmission component is further used to send pressure data of a target brake caliper to the host computer based on the control instruction, and the target brake caliper is a brake caliper on one wheel or a brake caliper on multiple wheels.

5. The method according to claim 1, characterized in that The host computer comprises: A data acquisition module, used to acquire the inner diameter data of the vehicle master cylinder body; A data processing module is connected to the data acquisition module and is used to obtain the required brake fluid volume based on the inner diameter data and the stroke data.

6. The device according to claim 5, characterized in that The data processing module is further used to calculate the cross-sectional area of ​​the master cylinder body based on the inner diameter data, and to obtain the required brake fluid volume by multiplying the cross-sectional area by the stroke data.

7. The device according to claim 1 or 2, characterized in that The data acquisition component is further used to collect at least two sets of brake pedal travel data and brake caliper pressure data for the same wheel during the braking test of the vehicle; The data transmission component is used to send the two sets of travel data and the pressure data to a host computer through the CAN card; The host computer is used to generate the PV relationship curve of the brake caliper after averaging the two groups of travel data and pressure data.

8. The device according to claim 1 or 2, characterized in that The data transmission component includes multiple signal transmission ports and a power port, wherein the data acquisition component and the CAN card are respectively connected to the data transmission component through the corresponding signal transmission ports; the power port is used to provide electrical energy to the data transmission component.

9. A performance testing method for a brake caliper, characterized in that: The method comprises: In the vehicle braking test, the brake pedal travel data and brake caliper pressure data are collected through the data acquisition component; Sending the travel data and the pressure data to a host computer via a CAN card; The upper computer processes the stroke data and the pressure data to generate a PV relationship curve for determining the performance of the brake caliper, wherein P represents the caliper pressure during vehicle braking and V represents the required amount of brake fluid.

10. The method according to claim 9, characterized in that Before sending the travel data and the pressure data to the host computer through the CAN card, the method further includes: Receiving control instructions from the host computer through the CAN card; Sending the travel data of the brake pedal and at least two sets of pressure data for the same brake caliper to the host computer based on the control instruction; After the upper computer processes the travel data and at least two groups of the pressure data, a PV relationship curve for determining the performance of the brake caliper is generated.

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