Epb brake clamping force testing device, integrated testing device and testing system

Abstract

The utility model discloses EPB brake clamping force testing arrangement, integrated test equipment and test system, including the first pressure sensor for testing the EPB brake clamping force of testing, the EPB brake of testing is positioned on the first tooling bottom plate through the caliper fixing tooling, and the caliper fixing tooling between the inner brake pad and the outer brake pad of EPB brake of testing is rigidly provided with two first pressure clamps, and the first pressure sensor is fixed between two first pressure clamps, and the first pressure sensor is electrically connected with data collector, the drive motor of EPB brake of testing is electrically connected with direct current source through direct current positive and negative conversion module. Adopt above -mentioned EPB brake clamping force testing arrangement, integrated test equipment and test system, can guarantee pressure sensor stress even through the rigid setting pressure clamp to promote the clamping force collection accuracy, thereby efficiently, accurately completes the EPB brake clamping force test.

Description

Technical Field

[0001] This utility model relates to the field of automotive braking technology, and in particular to an EPB brake clamping force testing device, integrated testing equipment and testing system. Background Technology

[0002] With the development of automotive intelligence, brake-by-wire systems have become a core component of electric and intelligent vehicles. Among them, the Electronic Parking Brake (EPB) system achieves parking braking through electronic control, which has higher safety and control precision compared to traditional mechanical parking systems. As the actuator, the clamping force performance of the EPB brake caliper directly determines the parking reliability, so accurate testing of its clamping force is particularly crucial.

[0003] In the prior art, CN105300590A (patent title "Electronic Parking Brake Braking Force Testing Device") discloses a structure for testing braking force using a force-sensing fixture. This fixture places a force-sensing fixture between the piston end face and the force-bearing end face of the caliper body, utilizing the clamping force when the piston is pushed out to measure the braking force. However, the force-sensing fixture lacks a fixed position, making it prone to uneven force distribution due to piston displacement, directly affecting the accuracy of clamping force acquisition. Utility Model Content

[0004] The purpose of this invention is to provide an EPB brake clamping force testing device, integrated testing equipment, and testing system to solve the aforementioned technical problems.

[0005] To achieve the above objectives, this utility model provides an EPB brake clamping force testing device, including a first pressure sensor for testing the clamping force of the EPB brake to be tested. The EPB brake to be tested is positioned on the base plate of the first fixture via a caliper fixing fixture. Two first pressure plates are rigidly arranged on the caliper fixing fixture between the inner and outer brake pads of the EPB brake to be tested. A first pressure sensor is fixed between the two first pressure plates. The first pressure sensor is electrically connected to a data acquisition unit. The drive motor of the EPB brake to be tested is electrically connected to a DC power supply via a DC forward / reverse converter module.

[0006] The integrated testing equipment includes an EPB brake clamping force testing device, a durability testing device, and a torque-clamping force comprehensive testing device. The torque-clamping force comprehensive testing device includes a torque input shaft, a coupling, a torque sensor, a torque limiter, a torque output shaft, and a caliper assembly, which are sequentially coaxially connected to the actuator of the EPB brake under test. Two second pressure plates are rigidly installed between the inner and outer brake pads of the caliper assembly. A second pressure sensor is fixed between the two second pressure plates. Both the second pressure sensor and the torque sensor are electrically connected to a data acquisition unit.

[0007] Preferably, the actuator, torque input shaft, torque output shaft and caliper assembly are all fixed on the positioning fixture by corresponding positioning plates, and the positioning fixture is fixed on the base plate of the second fixture; The second pressure clamp is fixed to the base plate of the second fixture by a corresponding positioning fixture.

[0008] Preferably, the output end of the actuator is coaxially connected to the drive shaft via an internal spline, the drive shaft is coaxially connected to the torque input shaft, the torque input shaft is coaxially connected to the torque sensor via a coupling, the torque sensor is coaxially connected to the torque limiter, the torque limiter is coaxially connected to the torque output shaft, and the torque output shaft is connected to the input end of the caliper assembly. Both the torque input shaft and the torque output shaft are mounted on the corresponding positioning plate via ball bearings.

[0009] Preferably, the durability testing apparatus includes a caliper clamp inserted between the inner and outer brake pads of the EPB brake to be tested; The drive motor of the EPB brake under test is electrically connected to a DC power supply via a DC-DC converter module. A current sensor and a voltage sensor are connected in series between the drive motor and the DC-DC converter module. Both the current sensor and the voltage sensor are electrically connected to the data acquisition unit.

[0010] Preferably, the base plate is equipped with three sets of durability testing devices for simultaneously testing three sets of EPB brakes to be tested.

[0011] The testing system includes integrated testing equipment, which is housed inside a high and low temperature chamber.

[0012] Therefore, the beneficial effects of this utility model, which employs the aforementioned EPB brake clamping force testing device, integrated testing equipment, and testing system, are as follows: 1. High efficiency of integrated and multi-condition testing: It can integrate the clamping force test, durability test and torque-clamping force comprehensive test functions of EPB brake into one unit, and the whole unit is placed in the high and low temperature chamber. It can complete multi-condition tests such as normal temperature and high and low temperature without frequent equipment replacement, which greatly saves experimental space and labor costs. 2. Excellent data acquisition accuracy: The first and second pressure clamps, which are rigidly set, fix the corresponding pressure sensors respectively, which can avoid uneven force on the sensors; at the same time, the actuator and torque shaft system adopt a coaxial positioning design, and the torque input shaft and output shaft are supported by ball bearings, which can reduce torque transmission deviation and significantly improve the acquisition accuracy of clamping force and torque data. 3. High efficiency and stability in durability testing: The durability testing module supports simultaneous testing of three sets of specimens to meet actual needs; and the current sensor and voltage sensor are connected in series between the drive motor and the DC-DC conversion module, which can monitor the motor's operating condition in real time, detect abnormalities in a timely manner, and ensure the stability of the testing process. 4. High equipment versatility: Each test component can be easily disassembled and precisely positioned through positioning plates and special tooling. It can be adapted to different models and left / right rudder EPB brakes. There is no need to design a separate test device for a single type of test piece, which can meet diverse testing needs.

[0013] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of an EPB brake clamping force testing device according to the present invention; Figure 2 This is a schematic diagram of the durability testing device of the integrated testing equipment of this utility model; Figure 3 This is a schematic diagram of the torque-clamping force integrated testing device of the present invention. Figure 4 This is a schematic diagram of the test system of this utility model.

[0015] Figure Labels 1. EPB brake to be tested; 11. Inner brake pad; 12. Outer brake pad; 2. EPB brake clamping force testing device; 21. First pressure sensor; 22. First pressure clamping plate; 23. Caliper fixing fixture; 24. First fixture base plate; 3. Durability testing device; 31. Caliper clamping plate; 32. Durability fixing fixture; 4. Torque-clamping force comprehensive testing device; 41. Internal spline; 42. Drive shaft; 43. Torque input shaft; 44. Coupling; 45. Torque sensor; 46. Torque limiter; 47. Torque output shaft; 48. Caliper assembly; 49. Positioning plate; 410. Second fixture base plate; 5. High and low temperature test chamber. Detailed Implementation

[0016] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0017] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0018] like Figure 1 As shown, the EPB brake clamping force testing device 2 includes a first pressure sensor 21 for testing the clamping force of the EPB brake 1 to be tested. The EPB brake 1 to be tested is positioned on the base plate 24 of the first fixture via a caliper fixing fixture 23. Two first pressure clamping plates 22 are rigidly set on the caliper fixing fixture 23 between the inner brake pad 11 and the outer brake pad 12 of the EPB brake 1 to be tested. The first pressure sensor 21 is fixed between the two first pressure clamping plates 22. The first pressure sensor 21 is electrically connected to a data acquisition unit. The drive motor of the EPB brake 1 to be tested is electrically connected to a DC power supply via a DC forward / reverse conversion module.

[0019] The clamping force test method is as follows: 1. Preparation before testing: Check the working status of the DC power supply, DC forward / reverse conversion module, data acquisition unit, and first pressure sensor 21 to ensure that the first pressure sensor 21 is within the valid calibration period; clean the surface of the inner brake pad 11 and outer brake pad 12 of the EPB brake 1 to be tested, remove oil and impurities to avoid affecting the transmission of clamping force; prepare disassembly and assembly tools that are compatible with the caliper fixing fixture 23, and confirm that the base plate and fixture are not deformed. 2. Installation and positioning confirmation: Confirm that the EPB brake 1 to be tested has been stably fixed on the base plate by the caliper fixing fixture 23 (without shaking), the two first pressure clamping plates 22 are rigidly fixed in place on the caliper fixing fixture 23, and the first pressure sensor 21 is tightly clamped between the two clamping plates, and the force-bearing surface of the sensor is completely aligned with the clamping direction of the inner and outer brake pads 12; check the electrical connection lines to ensure that the drive motor of the EPB brake 1 to be tested is electrically connected to the DC forward / reverse conversion module and the DC power supply in sequence, and that the first pressure sensor 21 is electrically connected to the data acquisition unit smoothly. 3. Environmental Condition Setting: If extreme environment testing is required, place the entire testing device inside the high and low temperature chamber 5. Set the target temperature according to the testing requirements (25℃ for normal temperature testing, -40℃ for low temperature testing, and 80℃ for high temperature testing). Start the high and low temperature chamber 5 and maintain the constant temperature for 30 minutes after the chamber temperature reaches the set value to ensure that the EPB brake 1 and the first pressure sensor 21 under test are consistent with the ambient temperature. 4. Clamping Force Test Execution: Enter the model of the EPB brake 1 under test, the test ambient temperature, and other parameters into the data acquisition unit. Set the clamping holding time to 5 seconds (simulating the actual parking state) and the number of test cycles to 2. Send a "clamp" command to the drive motor through the DC forward and reverse conversion module. The drive motor drives the inner and outer brake pads 12 of the EPB brake 1 under test to clamp towards the middle, squeezing the first pressure sensor 21. The data acquisition unit collects the peak clamping force in real time during each clamping process. 5. Data Processing and Result Judgment: After the test, the data acquisition unit automatically calculates the average value of the two clamping force peaks and generates a clamping force-time curve. The average value is compared with the clamping force performance standard of the EPB brake 1 under test. If the value is within the standard range, the clamping force test is deemed qualified. If the value is abnormal, check the installation status of the first pressure sensor 21 or the EPB brake 1 under test, and re-execute the test. 6. Test Completion: After the DC forward / reverse conversion module sends a "release" command and the EPB brake 1 under test is reset, turn off the DC power supply, data acquisition unit, and high / low temperature machine 5 (if used). After the device cools to room temperature, disassemble the EPB brake 1 under test, clean the first pressure clamp 22, caliper fixing fixture 23 and base plate, and store the test tools.

[0020] like Figure 2 and Figure 3As shown, the integrated testing equipment includes an EPB brake clamping force testing device 2, a durability testing device 3, and a torque-clamping force comprehensive testing device 4. The torque-clamping force comprehensive testing device includes a torque input shaft 43, a coupling 44, a torque sensor 45, a torque limiter, a torque output shaft 47, and a caliper assembly 48, which are sequentially and coaxially connected to the actuator of the EPB brake 1 under test. Two second pressure plates are rigidly arranged between the inner brake pad 11 and the outer brake pad 12 of the caliper assembly 48. A second pressure sensor is fixed between the two second pressure plates. Both the second pressure sensor and the torque sensor 45 are electrically connected to the data acquisition unit.

[0021] The actuator, torque input shaft 43, torque output shaft 47 and caliper assembly 48 are all fixed to the positioning fixture via corresponding positioning discs 49, and the positioning fixture is fixed to the second fixture base plate 410; the second pressure clamp is fixed to the second fixture base plate 410 via corresponding positioning fixtures.

[0022] The output end of the actuator is coaxially connected to the drive shaft 42 via the internal spline 41. The drive shaft 42 is coaxially connected to the torque input shaft 43. The torque input shaft 43 is coaxially connected to the torque sensor 45 via the coupling 44. The torque sensor 45 is coaxially connected to the torque limiter 46. The torque limiter 46 is coaxially connected to the torque output shaft 47. The torque output shaft 47 is connected to the input end of the caliper assembly 48. Both the torque input shaft 43 and the torque output shaft 47 are mounted on the corresponding positioning plate 49 via ball bearings.

[0023] The durability testing device 3 includes a caliper clamp 31 inserted between the inner brake pad 11 and the outer brake pad 12 of the EPB brake 1 to be tested. In this embodiment, during use, the EPB brake 1 to be tested is fixed on the workbench by the durability fixing fixture 32 for testing. The drive motor of the EPB brake 1 to be tested is electrically connected to a DC power supply via a DC forward / reverse conversion module. A current sensor and a voltage sensor are connected in series between the drive motor and the DC forward / reverse conversion module. Both the current sensor and the voltage sensor are electrically connected to the data acquisition unit.

[0024] Three sets of durability testing devices 3 are installed on the base plate to simultaneously test three sets of EPB brakes 1 to be tested.

[0025] The durability test method is as follows: 1. Preparation before test: Check the condition of the durability fixing fixture 32, caliper clamp 31 and electrical connection components of the three sets of durability test devices 3; confirm that the DC power supply and DC forward / reverse conversion module output are normal, and that the current sensor and voltage sensor are within the valid calibration period; clean the surfaces of the inner brake pads 11 and outer brake pads 12 of the three sets of EPB brakes 1 to be tested, remove oil and impurities, and avoid deviations in wear test results. 2. Specimen installation and positioning: Securely fix the three sets of EPB brakes 1 to be tested on the base plate using the durability fixing fixture 32, ensuring that the calipers do not wobble; insert a caliper clamp 31 of appropriate size (simulating the actual brake disc) between the inner brake pad 11 and outer brake pad 12 of each set of EPB brakes, ensuring that the clamp and brake pad are completely fitted without gaps. 3. Electrical Connection Verification: Connect the drive motor of each EPB brake 1 under test sequentially to the circuit with the current sensor and voltage sensor connected in series, then connect it to the DC forward / reverse converter module, and finally connect it to the DC power supply; at the same time, electrically connect the signal output terminals of the current sensor and voltage sensor to the data acquisition unit to ensure that the real-time signal can be transmitted normally. 4. Environmental Condition Setting (as needed): If it is necessary to simulate the durability performance under extreme environments, place the entire integrated test equipment in the high and low temperature chamber 5, and set the target temperature according to the test requirements (such as low temperature -40℃, high temperature 80℃ or normal temperature 25℃); start the high and low temperature chamber 5, and after the temperature inside the chamber reaches the set value, maintain the constant temperature for 30 minutes to ensure that the EPB brake is consistent with the ambient temperature. 5. Durability Cyclic Test Execution: Enter the information of three sets of test pieces into the data acquisition system and set the cycle parameters—total number of cycles (e.g., 100,000 cycles), clamping and holding time of 5 seconds (simulating parking), and releasing and holding time of 3 seconds (simulating starting). Start the test; the DC-DC converter alternately drives the three sets of EPB brakes to perform clamping-releasing cycles. The data acquisition unit records the current and voltage data of each drive motor in real time, as well as the number of cycles. During the test, if the current sensor detects that the operating current of a certain set of EPB brakes exceeds 1.5 times the rated current (indicating caliper jamming), the system automatically pauses the test for that set. After checking the clamping plate position or caliper fault, the test resumes from the interrupted cycle count. After every 20,000 cycles, manually inspect the wear of the caliper clamping plate 31; if the clamping plate is severely deformed, replace it. 6. Test Completion and Recording: After the number of cycles reaches the target, the system will automatically stop the test and turn off the DC power supply and the high and low temperature machine 5 (if used); after the device cools down to room temperature, remove the three sets of EPB brakes and caliper plates 31, and check the wear of the brake pads; export the current and voltage change curves and cycle number data recorded by the data acquisition unit, and archive them according to the test piece number.

[0026] The torque-clamping force comprehensive test method is as follows: 1. Preparation before test: Check the positioning fixture, positioning plate 49 and shaft components (torque input shaft 43, torque output shaft 47) of the torque-clamping force comprehensive test device to confirm that the ball bearing rotates smoothly and without jamming; verify the acquisition accuracy of torque sensor 45 and second pressure sensor to ensure that the data acquisition device and the two signals are connected normally; clean the actuator and caliper assembly 48 of the EPB brake 1 to be tested to remove dust and oil. 2. Shaft and component installation: Fix the actuator of the EPB brake 1 to be tested onto the positioning fixture using the corresponding positioning plate 49. Then, connect one end of the drive shaft 42 coaxially to the internal spline 41 of the actuator output end, and connect the other end coaxially to the torque input shaft 43. The torque input shaft 43 is coaxially connected to the torque sensor 45 via the coupling 44. The other end of the torque sensor 45 is coaxially connected to the torque output shaft 47 via the torque limiter 46. Finally, fix the torque output shaft 47 to the input end of the caliper assembly 48. Throughout the process, ensure that the coaxiality of the actuator, drive shaft 42, torque input shaft 43, torque sensor 45, torque limiter 46, torque output shaft 47, and caliper assembly 48 meets the requirements to avoid torque transmission deviation. 3. Pressure Sensor and Caliper Positioning: Two second pressure clamping plates are rigidly fixed to the base plate using corresponding positioning fixtures. The second pressure sensor is clamped between the two clamping plates. Adjust the position of the caliper assembly 48 so that its inner brake pad 11 and outer brake pad 12 are aligned with the second pressure sensor. Then, fix the caliper assembly 48 to the positioning fixture using the positioning plate 49, ensuring that the caliper clamping action can accurately compress the second pressure sensor. 4. Environment and Parameter Setting: Place the integrated testing equipment in the high and low temperature chamber 5 (set the temperature as needed, such as 25℃ for room temperature and 80℃ for high temperature). After maintaining the temperature for 30 minutes, enter the specimen model and test temperature into the data acquisition system, and set the clamping test parameters—clamping holding time 5 seconds, test cycle 2 times. 5. Synchronous Acquisition of Torque and Clamping Force: Upon start-up, the DC power supply powers the actuator via the control module. The actuator drives the drive shaft 42 and torque input shaft 43 to rotate via the internal spline 41. The torque sensor 45 acquires the torque value during torque transmission in real time, which is recorded by the data acquisition unit. Simultaneously, the torque is transmitted to the caliper assembly 48 via the torque limiter 46 and torque output shaft 47, driving the inner and outer brake pads 12 to clamp and compress the second pressure sensor. The sensor synchronously acquires the peak clamping force and transmits it to the data acquisition unit. 6. Data Processing and Result Judgment: After the test, the system automatically calculates the average torque and clamping force for two cycles, generating synchronous curves of "torque-time" and "clamping force-time". The results are compared with the performance standards of the EPB brake (e.g., torque deviation ≤5%, clamping force within the standard range) to determine whether the overall performance is qualified. Finally, all components are disassembled, the positioning fixture and shaft system are cleaned, and the test data report is saved.

[0027] like Figure 4As shown, the testing system includes an integrated testing device, which is installed inside the high and low temperature chamber 5.

[0028] It should be noted that the above electronic products are all mature products on the market. This embodiment only requires purchasing them and connecting them according to the instruction manual. No modifications have been made to them. Therefore, their circuit connection structure and principle will not be described in detail here.

[0029] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solution of this utility model, and these modifications or equivalent substitutions cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of this utility model.

Claims

1. An EPB brake clamping force testing device, comprising a first pressure sensor for testing the clamping force of the EPB brake to be tested, characterized in that: The EPB brake to be tested is positioned on the base plate of the first fixture by a caliper fixing fixture. Two first pressure plates are rigidly set on the caliper fixing fixture between the inner brake pad and the outer brake pad of the EPB brake to be tested. A first pressure sensor is fixed between the two first pressure plates. The first pressure sensor is electrically connected to the data acquisition unit. The drive motor of the EPB brake to be tested is electrically connected to a DC power supply via a DC forward / reverse converter module.

2. An integrated testing device, characterized in that: The device includes the EPB brake clamping force testing device, durability testing device, and torque-clamping force integrated testing device as described in claim 1. The torque-clamping force integrated testing device includes a torque input shaft, a coupling, a torque sensor, a torque limiter, a torque output shaft, and a caliper assembly that are sequentially coaxially connected to the actuator of the EPB brake under test. Two second pressure plates are rigidly arranged between the inner and outer brake pads of the caliper assembly. A second pressure sensor is fixed between the two second pressure plates. Both the second pressure sensor and the torque sensor are electrically connected to a data acquisition unit.

3. The integrated testing equipment according to claim 2, characterized in that: The actuator, torque input shaft, torque output shaft and caliper assembly are all fixed on the positioning fixture by corresponding positioning plates, and the positioning fixture is fixed on the base plate of the second fixture; The second pressure clamp is fixed to the base plate of the second fixture by a corresponding positioning fixture.

4. The integrated testing equipment according to claim 3, characterized in that: The output end of the actuator is coaxially connected to the drive shaft via an internal spline. The drive shaft is coaxially connected to the torque input shaft. The torque input shaft is coaxially connected to the torque sensor via a coupling. The torque sensor is coaxially connected to the torque limiter. The torque limiter is coaxially connected to the torque output shaft. The torque output shaft is connected to the input end of the caliper assembly. Both the torque input shaft and the torque output shaft are mounted on the corresponding positioning plate via ball bearings.

5. The integrated testing equipment according to claim 2, characterized in that: The durability testing apparatus includes a caliper clamp inserted between the inner and outer brake pads of the EPB brake to be tested; The drive motor of the EPB brake under test is electrically connected to a DC power supply via a DC-DC converter module. A current sensor and a voltage sensor are connected in series between the drive motor and the DC-DC converter module. Both the current sensor and the voltage sensor are electrically connected to the data acquisition unit.

6. The integrated testing equipment according to claim 5, characterized in that: Three sets of durability testing devices are installed on the base plate to simultaneously test three sets of EPB brakes to be tested.

7. A testing system, characterized in that: The integrated testing equipment includes the integrated testing equipment described in any one of claims 2-6, wherein the integrated testing equipment is disposed inside a high and low temperature chamber.

Images