A test system for EPB brake performance testing

Abstract

The application provides a test system for EPB brake performance test, comprising: a device body, a measured EPB brake installed on the top of the device body, a pressure test device for measuring the pressure of the measured EPB brake, a clamping force test device for measuring the clamping force of the measured EPB brake, and the performance of the measured EPB brake is measured through the pressure test device and the clamping force test device. The test system can effectively simplify the test process and reduce the test preparation time on the basis of meeting the EPB brake research and development test requirements. After inputting the test sample parameters before the test, the data processing can be automatically performed, and the time cost of manual data processing is saved. The test system also has the advantages of portability, adaptability to various working scenes, and effective protection measures to prevent accidental injury to the test personnel.

Description

Technical Field

[0001] This invention belongs to the field of automotive hydraulic EPB electronic brake testing equipment, and in particular relates to a test system for EPB brake performance testing. Background Technology

[0002] With the trend towards cleaner and more intelligent vehicles, brake-by-wire systems, as an indispensable part of electric and intelligent vehicles, have become a hot area of ​​research and attention within the industry. The Electronic Parking Brake (EPB) system is a crucial component of brake-by-wire systems. It uses electronic control to complete parking braking, which is not only safer and more reliable than traditional mechanically integrated parking brake systems, but also easier to operate and control, saves interior space, and creates conditions for the realization of other functions.

[0003] As the actuator of the electronic parking brake system, the EPB brake caliper faces more complex and stringent performance requirements in practical applications compared to traditional brake calipers. These requirements include ensuring the stability of current and parking force under different operating conditions, maintaining clamping force during parking, and mitigating clamping force decay after durability tests under various conditions. Currently, EPB brake calipers are widely used in various vehicles; however, research on testing and evaluation methods for the electrical and mechanical performance of EPB brake calipers is still in its early stages, indicating a vast testing market with significant business potential.

[0004] In summary, EPB brake caliper testing methods are diverse, testing conditions are stringent, and the testing market is broad. Therefore, it is necessary to research portable testing equipment for the performance and durability testing of hydraulic EPB electronic brakes. Summary of the Invention

[0005] In view of this, the present invention aims to provide a test system for EPB brake performance testing, to solve the performance and durability testing of hydraulic EPB electronic brakes, and the test equipment is a portable test device.

[0006] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0007] A test system for testing the performance of an EPB brake includes: a device body, an EPB brake under test mounted on top of the device body, a pressure testing device, and a clamping force testing device.

[0008] The pressure testing device is used to measure the pressure of the EPB brake under test;

[0009] The pressure testing device includes a gas pressure to liquid pressure conversion device for supplying pressure to the EPB brake under test, a pneumatic control device for controlling the gas pressure to liquid pressure conversion device, and a hydraulic measuring device for measuring the pressure supplied to the EPB brake under test by the gas pressure to liquid pressure conversion device.

[0010] The pneumatic control device is installed inside the equipment body and is connected to the gas pressure to liquid pressure conversion device through pipelines. The gas pressure to liquid pressure conversion device is installed at the bottom of the equipment body through a U-shaped tooling fixture. The gas pressure to liquid pressure conversion device is connected to the hydraulic measuring device through pipelines. The hydraulic measuring device is connected to the EPB brake through pipelines. The pipeline between the hydraulic measuring device and the EPB brake is connected through a hydraulic transmission conversion fixture.

[0011] The clamping force testing device is connected to the EPB brake under test through a pipeline and is used to measure the clamping force of the EPB brake under test.

[0012] Furthermore, the equipment body includes a left mounting space, a right mounting space, and a top mounting space. The pressure testing device is installed in the left mounting space, and the clamping force testing device is installed on the top and the side wall of the equipment body. A control system is installed in the right mounting space. The control system is used to control the pressure testing device and the clamping force testing device to test the EPB brake under test.

[0013] Furthermore, the gas pressure to liquid pressure conversion device adopts a gas-liquid booster cylinder, which includes a pneumatic piston cylinder, a hydraulic piston cylinder, an exhaust valve, and a liquid storage tank. The pneumatic piston cylinder is equipped with a gas source interface and an exhaust interface. The gas source interface is connected to the pneumatic control device through a pipeline, and the exhaust interface is connected to an exhaust valve. One end of the pneumatic piston cylinder is connected to the hydraulic piston cylinder. A liquid inlet is provided between the hydraulic piston cylinder and the pneumatic piston cylinder, and the liquid inlet is connected to the liquid storage tank. The liquid outlet of the hydraulic piston cylinder is connected to the pneumatic pressure measuring device through a pipeline.

[0014] Furthermore, the U-shaped tooling fixture includes a base plate, which is an L-shaped plate. The side wall of the base plate is provided with a U-shaped mounting groove. The pneumatic piston cylinder is fixed to the side wall of the base plate by bolts. The hydraulic piston cylinder extends to the outside of the base plate through the U-shaped mounting groove. A bottom mounting frame is installed at the bottom of the equipment body. The U-shaped tooling fixture is fixed to the bottom mounting frame by bolts.

[0015] Furthermore, the pneumatic control device includes an oil-water separator and a proportional flow valve. The inlet of the oil-water separator is connected to an air pump, the outlet of the oil-water separator is connected to the inlet of the proportional flow valve, and the outlet of the proportional flow valve is connected to the air source interface of the pneumatic piston cylinder.

[0016] Furthermore, a vertical mounting frame is installed inside the equipment body, and a baffle is installed on the vertical mounting frame. The air pressure control device is installed on the baffle.

[0017] Furthermore, the hydraulic transmission conversion fixture includes a fixture body with a mounting part fixed to the upper support plate on the top of the equipment body. The lower part of the fixture body extends into the interior of the equipment body, and an oil passage extends upward from the bottom of the fixture body. The side wall of the fixture body has a threaded hole one and a threaded hole two communicating with the oil passage. Threaded hole one is located above the mounting part and is connected to the EPB brake under test through a pipeline. Threaded hole two is located below the mounting part. The inlet of the oil passage and threaded hole two are respectively connected to the outlet of the air pressure measuring device.

[0018] Furthermore, the tested EPB brake is mounted on the top of the equipment body via an EPB brake mounting bracket.

[0019] Furthermore, the clamping force testing device includes a pressure sensor and a data acquisition unit. The data acquisition unit is installed on the side wall of the equipment body, and the pressure sensor is installed on the top of the equipment body. The pressure sensor is connected to the EPB brake under test through a line, and the other end of the pressure sensor is connected to the data acquisition unit through a line.

[0020] Compared with existing technologies, the test system for EPB brake performance testing described in this invention has the following advantages:

[0021] (1) The test system for EPB brake performance testing described in this invention can effectively simplify the test process and reduce test preparation time while meeting the test requirements for EPB brake R&D. At the same time, after inputting the test sample parameters before the test, the data can be automatically processed, eliminating the time cost of manual data processing. Furthermore, this EPB brake is a test of brake-by-wire. It has the advantages of being portable and adaptable to various working scenarios, and has effective protective measures to prevent accidental injury to test personnel.

[0022] (2) The test system for EPB brake performance testing described in this invention has a device body with universal wheels at the bottom, which can meet the needs of various working scenarios.

[0023] (3) The test system for EPB brake performance testing described in this invention is provided with a hydraulic control system. The hydraulic control system is provided with an air source processor, a gas pressure to liquid pressure conversion device, air and hydraulic transmission pipelines, connecting fixtures, oil reservoir, hydraulic sensor, and proportional flow valve. When the air-liquid booster cylinder is working after air is supplied, the air processed by the air source processor transmits pressure to the air-liquid booster cylinder, and the hydraulic sensor and proportional flow valve regulate the pressure to work.

[0024] (4) The test system for EPB brake performance testing described in this invention includes a clamping force testing device, which is equipped with a thin pressure sensor, a data acquisition device, and a data cable. When the EPB brake is working, the pressure is collected by the thin pressure sensor and transmitted to the data acquisition device for operation.

[0025] (5) The test system for EPB brake performance testing described in this invention includes an EPB brake electrical signal control and feedback system. The EPB brake electrical signal control and feedback system includes a DC power supply, a voltage sensor, a current sensor, a DC forward / reverse conversion module, and a data acquisition unit. The DC power supply provides power while the DC forward / reverse conversion module enables the EPB brake to rotate and apply pressure in both directions. The voltage sensor and current sensor collect the real-time voltage and current of the EPB brake and feed them back to the data acquisition unit. Attached Figure Description

[0026] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0027] Figure 1 This is a schematic diagram of the structure of a test system for EPB brake performance testing according to an embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram of the device body structure according to an embodiment of the present invention;

[0029] Figure 3 This is a schematic diagram of the control system mounting bracket structure according to an embodiment of the present invention;

[0030] Figure 4 This is a schematic diagram of the hydraulic transmission conversion fixture described in an embodiment of the present invention;

[0031] Figure 5 This is a schematic diagram of the U-shaped tooling fixture structure according to an embodiment of the present invention;

[0032] Figure 6 This is a schematic diagram of the gas pressure to liquid pressure conversion device and U-shaped tooling fixture installation structure according to an embodiment of the present invention;

[0033] Figure 7 This is a schematic diagram of the air pressure control device and baffle installation structure according to an embodiment of the present invention.

[0034] Explanation of reference numerals in the attached figures:

[0035] 1. Equipment body; 2. Pressure testing device; 3. Gas pressure to liquid pressure conversion device; 4. Hydraulic measuring device; 5. U-shaped tooling fixture; 6. Pneumatic control device; 7. EPB brake under test; 8. Control system; 9. Clamping force testing device; 11. Support plate; 12. Machine door; 13. Left mounting space; 14. Right mounting space; 15. Bottom mounting bracket; 16. Vertical mounting bracket; 17. Display; 41. Hydraulic transmission conversion fixture; 21. Piping; 31. Air source interface; 32. Pneumatic piston cylinder; 33. Liquid storage tank; 311. Hydraulic piston cylinder; 312. Exhaust port; 321. Liquid inlet. ; 411, Fixture body; 412, Mounting section; 413, Oil passage; 414, Threaded hole one; 415, Threaded hole two; 51, Base plate; 52, Mounting groove; 53, Reinforcing rib; 61, Oil-water separator; 62, Proportional flow valve; 611, Air inlet of oil-water separator; 612, Air outlet of oil-water separator; 621, Air inlet of flow valve; 622, Air outlet of flow valve; 71, EPB brake mounting bracket; 81, Mounting plate one; 82, Button control panel; 83, Industrial computer; 84, Connecting plate two; 85, Connecting plate three; 86, Top mounting bracket; 91, Pressure sensor. Detailed Implementation

[0036] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0037] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0038] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0039] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0040] like Figure 1 As shown, a test system for testing the performance of an EPB brake includes: a device body 1, an EPB brake 7 to be tested mounted on the top of the device body 1, a pressure testing device 2, and a clamping force testing device 9.

[0041] Pressure testing device 2 is used to measure the pressure of the tested EPB brake 7;

[0042] The pressure testing device 2 includes a gas pressure to liquid pressure conversion device 3 for supplying pressure to the EPB brake 7 under test, a pneumatic control device 6 for controlling the gas pressure to liquid pressure conversion device, and a hydraulic measuring device 4 for measuring the pressure supplied to the EPB brake 7 under test by the gas pressure to liquid pressure conversion device 3.

[0043] The pneumatic control device 6 is installed inside the equipment body 1 and is connected to the gas pressure to liquid pressure conversion device 3 through the pipeline 21. The gas pressure to liquid pressure conversion device 3 is installed at the bottom of the equipment body 1 through the U-shaped tooling fixture 5. The gas pressure to liquid pressure conversion device is connected to the hydraulic measuring device 4 through the pipeline 21. The hydraulic measuring device 4 is connected to the EPB brake 7 under test through the pipeline 21. The pipeline 21 between the hydraulic measuring device 4 and the EPB brake is connected through the hydraulic transmission conversion fixture 41.

[0044] The clamping force testing device 9 is connected to the EPB brake 7 under test through the pipe 21 and is used to measure the clamping force of the EPB brake 7 under test.

[0045] like Figure 1 As shown, this experimental system can measure multiple EPB brakes. Each EPB brake corresponds to a pressure testing device and a clamping force testing device, both of which are installed inside the equipment body. The distance between them can be adjusted appropriately according to the number of devices installed.

[0046] like Figure 1 , Figure 2 As shown, the tested EPB brake 7 is mounted on the tray on the top of the equipment body 1 via the EPB brake mounting bracket.

[0047] On the 11th, the bottom of the EPB brake mounting bracket is formed by four aluminum profiles connected together to form a rectangular bracket. A T-shaped bracket is installed on the upper part of the rectangular aluminum profile. The lower part of the T-shaped bracket is equipped with four through holes to connect to the rectangular aluminum profile. The upper part is semi-circular concave and equipped with four through holes to facilitate the installation of the left and right EPB brake assemblies.

[0048] The equipment body 1 is equipped with bottom universal wheels, which are evenly and equidistantly connected to the bottom of the equipment body 1 by bolts. The outer shell of the equipment body 1 is composed of aluminum profiles and thin steel plates connected by bolts. The inner shell of the equipment body 1 is composed of thin steel plates connected to the aluminum profiles of the outer shell of the equipment body 1 by bolts.

[0049] like Figure 1 , Figure 2 As shown, the equipment body 1 includes a left mounting space 13, a right mounting space 14, and a top mounting space. The pressure testing device 2 is installed in the left mounting space 13, and the clamping force testing device 9 is installed on the top and the side wall of the equipment body 1. The right mounting space 14 is equipped with a control system 8, which is used to control the pressure testing device 2 and the clamping force testing device 9 to test the EPB brake 7 under test.

[0050] like Figure 1 , Figure 2 As shown, the equipment body 1 is divided into three areas: left, right, and top, which are compactly installed and save space.

[0051] like Figure 3 As shown, the control system 8 includes a button control panel 82, an industrial computer 83, circuit boards, etc. The control system 8 is installed in the right mounting space 14 via a control system 8 mounting bracket. The control system 8 mounting bracket includes a top mounting bracket 86, a first connecting plate, a second connecting plate 84, and a third connecting plate 85. The top mounting bracket 86 of the control system 8 mounting bracket installs the circuit board, and the second layer installs the industrial computer 83. The bottom of the industrial computer 83 is equipped with a slide rail to place the keyboard tray. The industrial computer 83 can be pulled out for installation. The industrial computer 83 is fixed to the right mounting space 14 of the equipment body 1 via the second connecting plate 84. Other circuit boards, control boards, etc., can be installed via the third connecting plate 85, covering their circuit boards inside the equipment body 1. The control system 8 is, for example, controlled by a PLC. The control system 8 in this application is connected to the pressure testing device 2 and the clamping force testing device 9. The connection relationship in this application adopts the prior art and will not be described in detail here.

[0052] like Figure 1 , Figure 2 , Figure 3As shown, the mounting bracket of the control system 8 is connected to the aluminum profile of the outer shell of the equipment body 1 via steel plates, angle irons, and bolts. The front of the mounting bracket of the control system 8 is the operation area, in which a keyboard tray is placed facing upwards via a mounting rail for easy operation and space saving. The top of the equipment body 1 is equipped with a display screen via a universal bracket, so that the computer screen can be installed and displayed in various working environments. The rear cavity of the equipment workbench houses the EPB brake electrical signal control and feedback system.

[0053] like Figure 6 As shown, the gas pressure to liquid pressure conversion device 3 adopts a gas-liquid booster cylinder, which includes a pneumatic piston cylinder 32, a hydraulic piston cylinder 311, an exhaust valve, and a liquid storage tank 33. The pneumatic piston cylinder is equipped with a gas source interface 31 and an exhaust interface. The gas source interface 31 is connected to the pneumatic control device 6 through a pipeline 21. The exhaust interface is connected to an exhaust valve. One end of the pneumatic piston cylinder 32 is connected to the hydraulic piston cylinder 311. An inlet 321 is provided between the hydraulic piston cylinder 311 and the pneumatic piston cylinder 32. The inlet 321 is connected to the liquid storage tank 33. The outlet of the hydraulic piston cylinder 311 is connected to the pneumatic pressure measuring device through a pipeline 21.

[0054] The gas source interface 31, pneumatic piston cylinder 32, hydraulic piston cylinder 311, exhaust valve, and liquid storage tank 33 are assembled on a U-shaped tooling fixture. Gas enters from the gas source interface 31, drives the hydraulic piston cylinder 311 through the pneumatic piston cylinder 32, and thus outputs hydraulic pressure to the hydraulic measuring device 4.

[0055] The hydraulic measurement device 4 includes a 25MPa pressure transmitter and a data cable assembly, which can meet the hydraulic signal acquisition requirements of the EPB brake under various operating conditions.

[0056] The pneumatic-hydraulic booster cylinder is existing technology. The internal pneumatic piston cylinder 32, hydraulic piston cylinder 311, exhaust valve, etc., all have existing connection methods, which will not be described in detail here.

[0057] The liquid storage tank 33 is an existing liquid storage tank 33, which is bolted to the baffle.

[0058] like Figure 1 , Figure 2 , Figure 5 , Figure 6 As shown, the U-shaped tooling fixture 5 includes a base plate 51, which is an L-shaped plate. The side wall of the base plate 51 is provided with a U-shaped mounting groove 52. The pneumatic piston cylinder 32 is fixed to the side wall of the base plate 51 by bolts. The hydraulic piston cylinder 311 extends to the outside of the base plate 51 through the U-shaped mounting groove 52. A bottom mounting frame 15 is installed at the bottom of the equipment body 1. The U-shaped tooling fixture 5 is fixed to the bottom mounting frame 15 by bolts.

[0059] like Figure 1 , Figure 2 , Figure 5 , Figure 6 As shown, the gas pressure to liquid pressure conversion device 3 is fixed to the bottom mounting bracket 15 inside the equipment body 1 by the U-shaped tooling clamp 5. The distance between each gas pressure to liquid pressure conversion device 3 can be automatically adjusted according to the installation requirements.

[0060] like Figure 5 As shown, the U-shaped tooling fixture is fixed to the aluminum profile in the left installation space 13 of the equipment body 1. The bottom of the U-shaped tooling fixture is a 10mm thick steel plate with four through holes, which is installed on the bottom aluminum profile of the equipment body 1; the side is a 10mm thick U-shaped steel plate, the U-shaped structure is composed of a 115*52 (mm) cuboid and a semicircle with a diameter of 52mm, and the U-shaped steel plate is equipped with four φ9 through holes. Two 150*135 (mm) triangular reinforcing ribs 53 are welded to the back of the U-shaped steel plate. The above mechanism design facilitates the early installation and later maintenance of the gas pressure to liquid pressure conversion device 3. The upper support plate of (12)

[0061] 11 is a 670*1490*40 (mm) stainless steel structure. The upper part has a through hole connected to the hydraulic transmission conversion clamp 41, and the side has a through hole connected to the aluminum profile of the equipment body 1. An EPB brake mounting bracket and the EPB brake are placed on top. The stainless steel material helps prevent brake fluid corrosion.

[0062] like Figure 1 , Figure 7 As shown, the pneumatic control device 6 includes an oil-water separator 61 and a proportional flow valve 62. The air inlet of the oil-water separator 61 is connected to an air pump, the air outlet of the oil-water separator 61 is connected to the air inlet of the proportional flow valve 62, and the air outlet of the proportional flow valve 62 is connected to the air source interface 31 of the pneumatic piston cylinder 32.

[0063] A vertical mounting frame 16 is installed inside the equipment body 1. A baffle is installed on the vertical mounting frame 16, and a pneumatic control device 6 is installed on the baffle.

[0064] like Figure 1 , Figure 2 As shown, a baffle is installed on the vertical mounting frame 16, and the pneumatic control device 6 and the hydraulic storage tank are both installed on the baffle. The baffle is made of thin steel plate.

[0065] An electronic control board is mounted on the opposite side of the baffle. This board houses an EPB brake electrical signal control and feedback system. This system controls the operation of the tested EPB brake 7 and feeds back the tested operation signal of the tested EPB brake 7 to the control system 8. All of these are existing technologies. The EPB brake electrical signal control and feedback system includes a DC power supply, a DC-DC converter module, a voltage sensor, a current sensor, and a data acquisition unit. The DC power supply is bolted to the bottom of the mounting bracket of the control system 8 and connected to a 220V power supply at one end and to the DC-DC converter module at the other end via a power cable. The DC-DC converter module is connected to the test sample end via a power cable. The voltage sensor is connected between the test product and the DC-DC converter module via a data cable. The current sensor is also connected between the test product and the DC-DC converter module via a data cable. The data acquisition unit is connected to the voltage and current sensors at one end and to the equipment computer at the other end via a data cable.

[0066] like Figure 4 As shown, the hydraulic transmission conversion fixture 41 includes a fixture body 411, and a mounting part 412 is provided on the fixture body 411. The mounting part 412 is fixed to the upper support plate on the top of the equipment body 1.

[0067] On 11, the lower part of the clamp body 411 extends into the interior of the equipment body 1. The bottom of the clamp body 411 extends upward with an oil passage 413. The side wall of the clamp body 411 is provided with a threaded hole 414 and a threaded hole 415 communicating with the oil passage 413. The threaded hole 414 is located above the mounting part 412 and is connected to the EPB brake 7 under test through the pipe 21. The threaded hole 415 is located below the mounting part 412. The inlet of the oil passage 413 and the threaded hole 415 are respectively connected to the outlet of the air pressure measuring device.

[0068] like Figure 1 , Figure 4 As shown, the hydraulic transmission conversion fixture 41 is used to transfer the oil supply end of the gas pressure to liquid pressure conversion device 3 to the EPB brake under test 7, so as to provide pressure to the EPB brake under test 7.

[0069] The hydraulic transmission conversion fixture 41 has an internal φ3.5mm oil passage 413 running from top to bottom, meeting the general requirements of the brake line 21. An M10*1.0 threaded hole is provided on the upper side, with a smooth tapered bottom (115°) for easy connection to the EPB brake hydraulic power source. An M12*1.25 threaded hole is provided on the lower side and directly below, also with a smooth tapered bottom (115°) for easy connection to the hydraulic transmission line 21. The threaded hole directly below is offset outwards by 6mm for convenient operation and installation of the line 21.

[0070] The transmission pipeline 21 includes a φ10 gas transmission pipeline 21, a hydraulic transmission steel pipe with an outer conical surface (the overall system conical surface is sealed to prevent leakage), and a vehicle brake hose (to ensure hydraulic transmission efficiency during the test).

[0071] The tested EPB brake 7 is mounted on the top of the equipment body 1 via the EPB brake mounting bracket 71.

[0072] like Figure 2 As shown, the clamping force testing device 9 includes a pressure sensor 91 and a data acquisition unit. The data acquisition unit is installed on the side wall of the device body 1, and the pressure sensor 91 is installed on the top of the device body 1. The pressure sensor 91 is connected to the EPB brake 7 under test through a line, and the other end of the pressure sensor 91 is connected to the data acquisition unit through a line.

[0073] like Figure 1 , Figure 2 As shown, the pressure sensor 91 is used to collect the pressure value of the tested EPB brake 7 through the line. The data acquisition unit is connected to the pressure sensor 91 through the line. The pressure sensor 91 transmits the acquired pressure value to the data acquisition unit, and the data acquisition unit transmits it to the control system 8.

[0074] The clamping force testing device 9 includes a pressure sensor 91, a data acquisition unit, and a data cable (made of high and low temperature resistant material suitable for various working conditions). The pressure sensor 91 is a thin pressure sensor 91 (easy to place in the center of the EPB brake). The thin pressure sensor 91 is connected to the data acquisition unit through the sensor data cable. The data acquisition unit is connected to the device computer through the data cable. The data cable is used to connect the various circuit components of the clamping force testing device 9.

[0075] The specific implementation method is as follows:

[0076] The gas pressure to liquid pressure conversion device 3 is powered by an air pump and a liquid storage tank 33. The gas pressure to liquid pressure conversion device 3 transmits hydraulic pressure to a hydraulic measuring sensor. The hydraulic measuring sensor transmits hydraulic pressure to the EPB brake 7 under test through a pipeline 21 between itself and the hydraulic transmission conversion fixture, thereby measuring the pressure of the EPB brake 7 under test. The clamping force of the EPB brake 7 under test is measured by a clamping force testing device 9, and the pressure value and clamping force value are transmitted to the control system 8 for display on the screen.

[0077] It can be used with a temperature and humidity environmental chamber to conduct basic parking performance tests on EPB brakes, testing the relationship curves between voltage, current, hydraulic pressure, and clamping force under different environmental conditions. It can also determine product characteristics such as EPB brake starting current, idle current, clamping force, clamping current, clamping time, and release time. Secondly, it can be used with a temperature and humidity environmental chamber and vibration test bench to conduct parking durability tests on EPB brakes, testing the performance degradation rate and product strength of EPB brakes before and after the durability test under different environmental conditions.

[0078] After the test sample parameters are entered before the test, the data can be processed automatically, saving the time cost of manual data processing;

[0079] During the experiment, sensors read the test parameters, which in turn controlled the hydraulic pressurization device and the circuit control system to pressurize and supply power to the EPB brake, enabling the EPB brake to brake under different conditions. Simultaneously, hydraulic sensors, voltage sensors, and current sensors measured pressure, voltage, and current, allowing for the plotting of relevant curves and the extraction of key performance parameters based on the experimental parameters.

[0080] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A test system for testing the performance of EPB brakes, characterized in that... include: Equipment body (1), EPB brake under test (7) installed on top of equipment body (1), pressure testing device (2), clamping force testing device (9); The pressure testing device (2) is used to measure the pressure of the EPB brake (7) under test; The pressure testing device (2) includes a gas pressure to liquid pressure device (3) for supplying pressure to the EPB brake (7) under test, a gas pressure control device (6) for controlling the gas pressure to liquid pressure device, and a hydraulic measuring device (4) for measuring the pressure supplied by the gas pressure to liquid pressure device (3) to the EPB brake (7) under test. The pneumatic control device (6) is installed inside the equipment body (1) and connected to the gas pressure to liquid pressure device (3) through the pipeline (21). The gas pressure to liquid pressure device (3) is installed at the bottom of the equipment body (1) through the U-shaped tooling fixture (5). The gas pressure to liquid pressure device is connected to the hydraulic measuring device (4) through the pipeline (21). The hydraulic measuring device (4) is connected to the EPB brake through the pipeline (21). The pipeline (21) between the hydraulic measuring device (4) and the EPB brake is connected through the hydraulic transmission conversion fixture (41). The clamping force testing device (9) is connected to the EPB brake (7) under test through the pipeline (21) and is used to measure the clamping force of the EPB brake (7) under test. The hydraulic transmission conversion fixture (41) includes a fixture body (411), a mounting part (412) is provided on the fixture body (411), the mounting part (412) is fixed on the upper support plate (11) on the top of the equipment body (1), the lower part of the fixture body (411) extends into the interior of the equipment body (1), the bottom of the fixture body (411) extends upward with an oil passage (413), the side wall of the fixture body (411) is provided with a threaded hole one (414) and a threaded hole two (415) communicating with the oil passage (413), the threaded hole one (414) is located above the mounting part (412), the threaded hole one (414) is connected to the EPB brake (7) to be tested through the pipeline (21), the threaded hole two (415) is located below the mounting part (412), the inlet of the oil passage (413) and the threaded hole two (415) are respectively connected to the outlet of the air pressure measuring device; The pneumatic control device (6) includes an oil-water separator (61) and a proportional flow valve (62). The air inlet of the oil-water separator (61) is connected to an air pump, the air outlet of the oil-water separator (61) is connected to the air inlet of the proportional flow valve (62), and the air outlet of the proportional flow valve (62) is connected to the air source interface (31) of the pneumatic piston cylinder (32).

2. The test system for EPB brake performance testing according to claim 1, characterized in that: The equipment body (1) includes a left mounting space (13), a right mounting space (14), and a top mounting space. The pressure testing device (2) is installed in the left mounting space (13), and the clamping force testing device (9) is installed on the top and the side wall of the equipment body (1). The right mounting space (14) is equipped with a control system (8). The control system (8) is used to control the pressure testing device (2) and the clamping force testing device (9) to test the EPB brake (7) under test.

3. The test system for EPB brake performance testing according to claim 1, characterized in that: The gas pressure to liquid pressure conversion device (3) adopts a gas-liquid booster cylinder, which includes a gas piston cylinder (32), a hydraulic piston cylinder (311), an exhaust valve, and a liquid storage tank (33). The gas piston cylinder is provided with a gas source interface (31) and an exhaust interface. The gas source interface (31) is connected to the gas pressure control device (6) through a pipeline (21). The exhaust interface is connected to an exhaust valve. One end of the gas piston cylinder (32) is connected to the hydraulic piston cylinder (311). An inlet (321) is provided between the hydraulic piston cylinder (311) and the gas piston cylinder (32). The inlet (321) is connected to the liquid storage tank (33). The outlet of the hydraulic piston cylinder (311) is connected to the gas pressure measuring device through a pipeline (21).

4. The test system for EPB brake performance testing according to claim 1, characterized in that: The U-shaped tooling fixture (5) includes a base plate (51), which is an L-shaped plate. The side wall of the base plate (51) is provided with a U-shaped mounting groove (52). The pneumatic piston cylinder (32) is fixed to the side wall of the base plate (51) by bolts. The hydraulic piston cylinder (311) extends to the outside of the base plate (51) through the U-shaped mounting groove (52). The bottom of the equipment body (1) is equipped with a bottom mounting frame (15), and the U-shaped tooling fixture (5) is fixed to the bottom mounting frame (15) by bolts.

5. The test system for EPB brake performance testing according to claim 1, characterized in that: The equipment body (1) is equipped with a vertical mounting frame (16), and a baffle is installed on the vertical mounting frame (16). The air pressure control device (6) is installed on the baffle.

6. The test system for EPB brake performance testing according to claim 1, characterized in that: The tested EPB brake (7) is mounted on the top of the equipment body (1) via the EPB brake mounting bracket (71).

7. The test system for EPB brake performance testing according to claim 1, characterized in that: The clamping force testing device (9) includes a pressure sensor (91) and a data acquisition unit. The data acquisition unit is installed on the side wall of the equipment body (1), and the pressure sensor (91) is installed on the top of the equipment body (1). The pressure sensor (91) is connected to the EPB brake (7) under test through a line, and the other end of the pressure sensor (91) is connected to the data acquisition unit through a line.

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