Test method and device for hydraulic controller in brake system

Abstract

The embodiment of the invention provides a testing method and device for a hydraulic controller in a brake system, and relates to the technical field of brake testing, and the method comprises the steps: adjusting the control parameters of a brake control module and a transfer hydraulic module in the hydraulic brake system based on program control equipment, the brake control module is used for conveying brake fluid to a pipeline in the hydraulic brake system, and the transfer hydraulic module is used for controlling the volume flow of the brake fluid; collecting test data generated by a hydraulic controller in the brake control module under the control parameters, wherein the test data is used for representing the operation condition of the hydraulic controller under the control parameters; based on preset operation data, a test result corresponding to the test data is analyzed, the test result is used for representing whether the hydraulic controller meets performance requirements or not, and the preset operation data is performance standard data used for detecting the performance of the hydraulic controller. Testing of the hydraulic braking system is completed automatically, testing operation is simplified, the testing period is shortened, and testing accuracy is improved.

Description

Technical Field

[0001] The present application relates to the technical field of braking tests, and particularly relates to a test method and device for a hydraulic controller in a braking system. Background Art

[0002] An electro-hydraulic brake system (EHB) obtains the braking intention of a driver through an electronic pedal sensor and transmits the signal to an Electronic Control Unit (ECU) to control the driving state of the vehicle and implement its various functions. It mainly uses data acquisition and exchange of various sensors and buses to judge the vehicle state and the driver's intention and controls the vehicle through an actuator. Briefly speaking, an electro-hydraulic brake system is composed of a brake pedal device, a hydraulic brake controller, pipelines, hydraulic calipers, etc. By precisely controlling the flow rate and volume of the brake fluid in the pipelines through the brake pedal device and the hydraulic brake controller, the degree of the hydraulic caliper clamping the wheel is controlled. That is to say, the braking force transmission medium of the electro-hydraulic brake system is the brake fluid in the hydraulic pipeline. Whether the brake fluid of the hydraulic brake controller leaks or contains too much air directly affects the braking force transmission efficiency and the vehicle's overall braking force, which may cause the vehicle's braking performance to decrease and the vehicle to be unable to stop.

[0003] In the related art, the braking fluid leakage test for the electro-hydraulic brake system is usually a manual test. The manual test requires unscrewing the pipeline interface on the vehicle to let air into the pipeline or artificially controlling the leakage of the braking pipeline to measure the braking fluid leakage amount. For example, in the hydraulic braking system simulation test device and method recorded in CN202311401043.6, the data of sensors, the piston displacement state data of the hydraulic braking system, etc. are collected, processed, evaluated, and analyzed to judge whether the braking of the hydraulic braking system is normal. This method cannot precisely control the amount of air entering the pipeline and the amount of braking fluid leakage, etc. And due to different vehicle models and different specifications of the electro-hydraulic brake system, the corresponding test-related parameters are also likely to be different, resulting in complex test preparation, a long cycle, and low accuracy.

[0004] Therefore, there is an urgent need for a test method and device for a hydraulic controller in a braking system to automatically complete the test of the hydraulic braking system, simplify the test operation of the hydraulic braking system, shorten the test cycle of the hydraulic braking system, and improve the test accuracy of the hydraulic braking system. Summary of the Invention

[0005] The embodiment of the present application provides a test method and device for a hydraulic controller in a braking system, which can automatically complete the test of the hydraulic braking system, simplify the test operation of the hydraulic braking system, shorten the test cycle of the hydraulic braking system, and improve the test accuracy of the hydraulic braking system.

[0006] In a first aspect, the embodiment of the present application provides a test method for a hydraulic controller in a braking system, and the method includes: Based on the programmable device, adjust the control parameters of the braking control module and the transfer hydraulic module in the hydraulic braking system. The braking control module is used to deliver brake fluid to the pipeline in the hydraulic braking system, and the transfer hydraulic module is used to control the volume flow rate of the brake fluid. Collect the test data generated by the hydraulic controller in the braking control module under the control parameters. The test data is used to characterize the operation of the hydraulic controller under the control parameters. Based on the preset operation data, analyze the test results corresponding to the test data. The preset operation data is the performance standard data for testing the performance of the hydraulic controller, and the test results are used to characterize whether the hydraulic controller meets the performance requirements.

[0007] Optionally, the control parameters include the first cylinder stroke and the first current value. Based on the programmable device, adjusting the control parameters of the braking control module and the transfer hydraulic module in the hydraulic braking system includes: Based on the programmable device, adjust the first cylinder stroke corresponding to the programmable cylinder in the braking control module and the first current value of the corresponding solenoid valve in the transfer hydraulic module. The programmable cylinder is used to provide a stroke input to the hydraulic braking system, and the hydraulic controller pushes the brake fluid in the pipeline according to this input. The solenoid valve is used to control the volume flow rate of the brake fluid in the pipeline. The collecting the test data generated by the hydraulic controller in the braking control module under the control parameters includes: for each solenoid valve included in the transfer hydraulic module, perform the following steps: Open the selected solenoid valve, collect the first liquid flow rate, the first liquid volume, and the valve opening duration in the pipeline when the selected solenoid valve is at different first current values, and record the corresponding first current value and its corresponding first liquid flow rate, first liquid volume, and valve opening duration as a set of test data.

[0008] Optionally, when the first liquid flow rate exceeds the preset flow rate threshold, it further includes: Collect the first alarm data of the hydraulic controller in the brake control module, and record the first liquid flow rate exceeding the preset flow threshold, its corresponding first liquid volume, first current value, valve opening duration, and the first alarm data as a set of test data.

[0009] Optionally, when the first liquid volume exceeds the preset volume threshold, it further includes: Collect the second alarm data of the hydraulic controller in the brake control module, and record the first liquid volume exceeding the preset volume threshold, its corresponding first liquid flow rate, first current value, valve opening duration, and the second alarm data as a set of test data.

[0010] Optionally, the control parameters include the second electric cylinder stroke and the second current value. Adjusting the control parameters of the brake control module and the transfer hydraulic module in the hydraulic brake system based on the program control device includes: Based on the program control device, adjust the second current value of each of the multiple solenoid valves in the transfer hydraulic module, and adjust the second electric cylinder stroke corresponding to the program-controlled electric cylinder in the brake control module until the brake fluid in the pipeline reaches the target liquid volume. The program-controlled electric cylinder is used to provide pressure to the hydraulic brake system to push the brake fluid in the pipeline, and the solenoid valve is used to control the volume flow rate of the brake fluid in the pipeline; Close the multiple solenoid valves, open the intake solenoid valve in the transfer hydraulic module, simultaneously control the electric cylinder stroke of the program-controlled electric cylinder to return to the initial value, and close the intake solenoid valve when the pressure environment of the hydraulic brake system meets the set pressure condition.

[0011] Optionally, the control parameters further include the third electric cylinder stroke. The test data collected by the hydraulic controller in the brake control module under the control parameters includes: Collect the target liquid volume, and the corresponding brake pressure data of the hydraulic controller under different third electric cylinder strokes, and record the target liquid volume, third electric cylinder stroke, and its corresponding brake pressure data as a set of test data. The hydraulic controller is used to distribute the pressure in the hydraulic brake system.

[0012] Optionally, when the target liquid volume exceeds the preset volume threshold, it further includes: Collect the third alarm data of the hydraulic controller, and record the third alarm data, its corresponding third electric cylinder stroke, brake pressure data, and the target liquid volume as a set of test data.

[0013] Optionally, after the data collection is completed, it further includes: Based on the programmed device, activate multiple solenoid valves included in the transfer hydraulic module, and adjust the cylinder stroke corresponding to the programmed electric cylinder in the brake control module to perform brake fluid filling and air exhausting on the hydraulic brake system.

[0014] Optionally, before adjusting the control parameters of the brake control module and the transfer hydraulic module in the hydraulic brake system based on the programmed device, it further includes: Test and confirm that the fluid consumption curve of the hydraulic brake system meets the preset curve conditions.

[0015] In a second aspect, an embodiment of the present application provides a test device for a hydraulic controller in a brake system. The test device includes a programmed device and a hydraulic brake system. The hydraulic brake system includes a brake control module and a transfer hydraulic module. The device includes: The programmed device is electrically connected to the brake control module and the transfer hydraulic module respectively; The brake control module is used to deliver brake fluid to the pipeline in the hydraulic brake system; The transfer hydraulic module is used to control the flow rate and volume flow rate of the brake fluid; The programmed device is used to adjust the control parameters of the brake control module and the transfer hydraulic module, and collect test data generated by the hydraulic controller in the brake control module under the control parameters. The test data is used to characterize the operation of the hydraulic controller under the control parameters; based on the preset operation data, analyze the corresponding test results of the test data. The test results are used to characterize whether the hydraulic controller meets the performance requirements. The preset operation data is performance standard data for testing the performance of the hydraulic controller.

[0016] The beneficial effects of the present application are as follows: In the embodiments of the present application, a test method for a hydraulic controller in a braking system is proposed. In this method, simulation data of the braking device of a vehicle (or other devices with braking devices, etc.) to be tested is set in a programmable device. The programmable device is used to control a hydraulic braking system that simulates an actual braking device, and the control parameters of the braking control module and the transfer hydraulic module in the hydraulic braking system are adjusted to collect the test data generated by the hydraulic controller under the control parameters. In this way, without manually operating the braking device in the vehicle or other devices, the test operation can be simplified, the test cycle can be shortened, and the programmable device can be used to accurately control the hydraulic braking system to obtain accurate test data of the hydraulic controller under the control parameters, and corresponding accurate test results can be obtained. In addition, the simulation data of the corresponding vehicle or other devices with braking devices can be stored or replaced in the programmable device, so that the braking devices of the corresponding vehicle or devices can be tested, improving the versatility of the test method. Further, while ensuring the accuracy of the test results, the test of braking devices of different specifications can be simplified.

[0017] These implementation manners of the present application or other implementation manners will be more clearly understood in the following description of the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0019] Figure 1 It is a schematic diagram of an electronic hydraulic braking system provided by an embodiment of the present application; Figure 2 It is a schematic diagram of a test device for a hydraulic controller in a braking system provided by an embodiment of the present application; Figure 3 It is a line graph showing the relationship between the control current of different solenoid valves and the hydraulic leakage speed provided by an embodiment of the present application; Figure 4 It is a flowchart showing a test method for a hydraulic controller in a braking system provided by an embodiment of the present application; Figure 5 It is a line graph showing the relationship between the stroke of an electric cylinder and the pressure in a hydraulic controller provided by an embodiment of the present application; Figure 6 It is a schematic diagram of a calibrated pressure-volume curve provided by an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] To make the objectives, technical solutions and advantages of this application clearer, the following will further describe this application in detail with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of this application, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts shall fall within the scope of protection of this application.

[0021] Terms such as "first" and "second" in the description and claims of this application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily need to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present invention described here can be implemented in an order other than those illustrated or described here.

[0022] The following explains some terms in the embodiments of this application to facilitate the understanding of those skilled in the art: Electronic hydraulic braking system (EHB): Its working principle is to obtain the driver's braking intention through an electronic pedal sensor and transmit the signal to the electronic control unit (ECU). After the ECU analyzes the signal, components such as a hydraulic controller and a solenoid valve are used to adjust the braking pressure, and finally achieve precise control of the braking force of each wheel. This system not only improves the braking reaction speed and response time, but also enhances the freedom of braking control, thereby improving the braking efficiency of the vehicle. Compared with the traditional hydraulic system, the EHB system has a more compact structure, more precise control, and can better integrate auxiliary functions such as the electronic parking brake system (EPB).

[0023] Hydraulic caliper: It is set near the wheel. When the hydraulic braking system converts the pedal force into hydraulic energy, the hydraulic caliper converts the hydraulic energy into mechanical energy to hold the wheel tightly to achieve braking.

[0024] Calibration: Calibration is a key development process to optimize braking performance (such as response and stability) by adjusting parameters and set fault thresholds for sensors, pressure, etc. to ensure the safe and reliable operation of the system.

[0025] The pipeline of the hydraulic braking system: It includes hard pipes and flexible hoses, which are connected together with joints. Its function is to transmit the brake fluid obtained from the electric cylinder to each wheel brake. Pipeline leakage will cause faults in the braking system. Therefore, the braking pipeline is a very important component in the system, and attention must be paid to inspection and maintenance.

[0026] Program-controlled electric cylinder: It is a modular product that integrates a servo motor and a lead screw, converting the rotational motion of the servo motor into a linear motion. At the same time, it converts the best advantages of the servo motor - precise rotational speed control, precise number of revolutions control, precise torque control - into - precise speed control, precise position control, precise thrust control; it is a new product that realizes a high-precision linear motion series.

[0027] Electronic liquid level gauge: Its working principle is mainly based on buoyancy and magnetic coupling. The sensor probe usually consists of a transmitter and a receiver. When the liquid level changes, the liquid will affect the time and degree of signal transmission from the transmitter to the receiver. After receiving the signal, the receiver processes it through the internal circuit to calculate the height of the liquid level. The electronic liquid level gauge realizes liquid level measurement through electronic measurement technology and usually consists of a sensor and a signal processing part. The sensor detects the liquid level change and converts it into an electrical signal. Then the signal processing part processes and amplifies the electrical signal and finally outputs a standard electrical signal for the display to receive and display.

[0028] Hydraulic flowmeter. The hydraulic flowmeter is used to measure the flow rate of hydraulic oil (brake fluid) in the system to ensure the normal operation of the system. It can help monitor and adjust the flow rate and flow of hydraulic oil (brake fluid), thereby improving production efficiency. The measurement data of the hydraulic flowmeter can also help identify system failures and perform accurate fault diagnosis. The design concept of the embodiments of the present application is briefly introduced below: In the related art, the electronic hydraulic braking system introduces an electronic control unit and a variety of sensors, and uses an electric motor as the braking force power source to make the braking control realize electrification and intelligence. As Figure 1 shown, it is a schematic diagram of an electronic hydraulic braking system (EHB) provided by the embodiments of the present application. The electronic hydraulic braking controller 101 provides high-performance braking response, supports braking energy recovery, responds to the braking requests of the active driving system, and can adjust the braking feeling, and is applicable to a wider range of new energy and traditional fuel vehicle models. In addition, the electronic hydraulic braking controller 101 integrates the electronic stability control function ESC, improves the safety of the braking system, and has a higher integration level. The entire electronic hydraulic braking system consists of: a brake pedal unit 102, an electronic hydraulic braking controller 101, a hydraulic caliper 103, a parking actuator 104, an electronic parking switch 105, an inertial measurement unit 106, and a wheel speed sensor 107 (the one marked by 107 in the figure is the wheel speed sensor harness, which can also be called the sensor line 110), a hydraulic braking line 108, and a parking actuator control line 109.

[0029] Among them, the braking force transmission medium of the hydraulic braking system is the brake fluid in the hydraulic pipeline. Whether the brake fluid of the hydraulic braking controller leaks or contains too much air directly affects the braking force transmission efficiency. If the hydraulic braking controller fails, it will affect the vehicle's braking force, thereby reducing the vehicle's braking performance and making it impossible to brake. The typical failure forms of the hydraulic braking system are the leakage of the hydraulic pipeline and the existence of too much air in the hydraulic pipeline. For these two failure forms, during the product design process of the hydraulic braking controller, for different vehicle models, it must include the calibration and testing of the hydraulic pipeline air detection and the hydraulic pipeline leakage detection.

[0030] Due to different vehicle models, the hydraulic parameters of the braking system are different. It is necessary to measure, calibrate, and complete fault monitoring tests for each type of failure. The current test methods usually adopt a manual method, where the brake pipe interface is unscrewed on the vehicle to let air into the brake hydraulic pipe, or the brake pipe leakage is manually controlled to measure the hydraulic leakage volume, etc. Through the application of actual projects, it is found that such a test calibration scheme has complex test preparations, a long cycle, and low accuracy.

[0031] In view of this, an embodiment of the present application provides a test device 200 for a hydraulic controller in a braking system, as Figure 2 shown. The test device includes a program-controlled device 201 and a hydraulic braking system 202. The hydraulic braking system includes a brake control module and a transfer hydraulic module 2022, including: The program-controlled device 201 is electrically connected to the brake control module and the transfer hydraulic module 2022 respectively; The brake control module is used to deliver brake fluid to the pipeline in the hydraulic braking system; The transfer hydraulic module 2022 is used to control the volume flow rate of the brake fluid; The program-controlled device 201 is used to adjust the control parameters of the brake control module and the transfer hydraulic module 2022, and collect the test data generated by the hydraulic controller 2021 in the brake control module under the control parameters. The test data is used to characterize the operating conditions of the hydraulic controller 2021 under the control parameters; based on the preset operating data, analyze the corresponding test results of the test data. The test results are used to characterize whether the hydraulic controller 2021 meets the performance requirements. The preset operating data is the performance standard data used to test the performance of the hydraulic controller.

[0032] In one embodiment, the program-controlled device 201 provides an EHB virtual vehicle operating environment, including vehicle power supply, network communication, etc.

[0033] In one embodiment, the hydraulic controller can also be an electronic control assistant controller E-Booster and a vehicle stability controller ESC.

[0034] In one embodiment, the above program-controlled device 201 can adopt an automated program control to simulate the hydraulic braking system of the actual braking system (which can also be called a closed-loop measurement and control system), and support typical hydraulic pipeline air detection, hydraulic pipeline leakage detection, support parameter calibration, alarm threshold test, and consistency inspection of the hydraulic controller (which can also be called the measured electronic hydraulic braking controller EHB).

[0035] In one embodiment, the test device 200 may be composed of a programmable device 201, a programmable electric cylinder 2020, a hydraulic controller 2021, a transfer hydraulic module 2022 (including an intake solenoid valve 20222, a left rear solenoid valve 20224 / a right front solenoid valve 20225 / a left front solenoid valve 20226 / a right rear solenoid valve 20227, an air dryer 20221, a check valve 20223), a hydraulic flowmeter 2023, an electronic liquid level gauge 2024, and four brake calipers 2025. Among them, The lines between the programmable electric cylinder 2020, the hydraulic controller 2021, the intake solenoid valve 20222, the left rear solenoid valve 20224 / a right front solenoid valve 20225 / a left front solenoid valve 20226 / a right rear solenoid valve 2022, the hydraulic flowmeter 2023, the electronic liquid level gauge 2024 and the programmable device 201 are electrical lines; The lines connecting the four solenoid valves of the left rear solenoid valve 20224 / a right front solenoid valve 20225 / a left front solenoid valve 20226 / a right rear solenoid valve 20227 to the hydraulic flowmeter 2023 and the electronic liquid level gauge 2024 are low-pressure hydraulic lines; The lines connecting the four solenoid valves of the left rear solenoid valve 20224 / a right front solenoid valve 20225 / a left front solenoid valve 20226 / a right rear solenoid valve 20227 to the hydraulic controller 2021 are high-pressure hydraulic lines; the line between the air dryer 20221 and the intake solenoid valve 20222 is an air line.

[0036] In one embodiment, the hydraulic controller 2021 is the device under test, and the fault monitoring logic in the algorithm of the test hydraulic controller 2021 specifically refers to the detection of brake fluid leakage in the hydraulic braking system and the detection of residual air in the hydraulic braking system pipeline during fault monitoring.

[0037] In one embodiment, the programmable electric cylinder is connected to the EHB brake pedal interface, can receive instructions from the programmable device, accurately control the speed and stroke of the electric cylinder to move forward and backward, and simulate the driver stepping on the brake.

[0038] In one embodiment, the transfer hydraulic module, as the transfer pipeline of the hydraulic circuit connecting the EHB and the brake caliper, provides a hydraulic one-to-two pipeline, can install solenoid valves, and provides input and output hydraulic pipelines for the solenoid valves.

[0039] Among them, the four solenoid valves of the left rear / right front / left front / right rear can control the closing and opening degree of the solenoid valves through the programmable device; different currents correspond to different opening degrees of the solenoid valves; the flow rate of the brake fluid in the brake pipeline is controlled by the opening degrees of different solenoid valves.

[0040] The opening degree of the solenoid valve is reflected by the aperture of the throttle hole. According to the hydraulic system flow formula, the hydraulic flow rate can be calculated:

[0041] Among them, : Flow coefficient, : Liquid density (unit: kg / m³), : Pressure difference before and after the throttle orifice (unit: Pa), and d is the orifice diameter of the throttle orifice of the solenoid valve opening.

[0042] For the convenience of understanding, the embodiments of the present application provide a table and a corresponding line chart of the solenoid valve current controlling the leakage speed. As shown in Table 1 below, in the case of a 20 bar hydraulic pressure difference, the hydraulic leakage speeds corresponding to different solenoid valve control currents, Figure 3 is the line chart of the corresponding data in Table 1.

[0043]

[0044] Table 1 An air dryer is used to dry the air before injecting it into the brake pipeline. Specifically, the intake solenoid valve is used to open when injecting air into the brake pipeline. Since the air contains moisture, and the water content in the brake fluid in the braking system needs to be strictly controlled to avoid excessive water content affecting the braking and test performance, therefore, when injecting air, it is necessary to dry the air through the filtration of the air dryer.

[0045] A one-way valve functions to only allow air to enter and prevent the brake fluid from flowing back into the external air.

[0046] Four brake calipers (hydraulic calipers) need to be adjusted according to different test items. Usually, the vehicle manufacturer provides brake calipers and brake pipelines that are consistent with the production models to achieve the same brake fluid consumption as the whole vehicle, and ensure the consistency of the hydraulic braking system test method (simulating the whole vehicle test / bench test) in the present application and the hydraulic braking system of the whole vehicle test.

[0047] A hydraulic flowmeter is used to measure the current flow rate of the brake fluid.

[0048] An electronic liquid level gauge is used to measure the total amount of brake fluid leaked in this test.

[0049] Programmable equipment, integrating programmable power supply, industrial control computer, programmable electric cylinder drive and position acquisition board, EHB product customization interface board (including power supply, communication, digital input and output, etc.), vehicle network simulation board, wheel speed sensor simulation board, solenoid valve current regulation board, hydraulic flowmeter acquisition board, electronic hydraulic meter acquisition board, etc., serves as the core processing unit of the test system and provides data interface and display interface for EHB product R & D personnel. The programmable equipment provides a fault-free environment for the normal operation of the EHB product and simulates the installation of the EHB product in the vehicle. In addition, the programmable equipment needs to complete the control of the programmable electric cylinder, the acquisition of the sensor position, and the measurement of the brake fluid flow and leakage according to the test scripts of the EHB hydraulic system leakage test and air test.

[0050] Based on the above Figure 2 test device, an embodiment of the present application provides a test method flow for a hydraulic controller in a braking system, as Figure 4 shown, including: Step 401, based on the programmable equipment, adjust the control parameters of the brake control module and the transfer hydraulic module in the hydraulic braking system. The brake control module is used to deliver brake fluid to the pipeline in the hydraulic braking system, and the transfer hydraulic module is used to control the liquid flow of the brake fluid.

[0051] Step 402, collect the test data generated by the hydraulic controller in the brake control module under the control parameters. The test data is used to characterize the operation of the hydraulic controller under the control parameters.

[0052] Step 403, based on the preset operation data, analyze the test results corresponding to the test data. The preset operation data is the performance standard data used to test the performance of the hydraulic controller, and the test results are used to characterize whether the hydraulic controller meets the performance requirements.

[0053] In one embodiment, the programmable electric cylinder and the hydraulic controller in the brake control module can convert the mechanical energy of the driver stepping on the pedal into pressure, push the brake fluid into the pipeline, and the programmable equipment can control the operation of the corresponding components and parts in the brake control module, as well as parameters such as pressure.

[0054] In one embodiment, the transfer hydraulic module includes a solenoid valve. Under the control of the programmable equipment, different current values are given to the solenoid valve to obtain different brake fluid flows.

[0055] In one embodiment, the control parameters can be set in the programmable equipment; for example, if testing the hydraulic braking system of a certain specification vehicle, corresponding vehicle simulation data can be input into the programmable equipment, as well as the standard parameters of the hydraulic braking system under normal conditions and data such as alarm generation under abnormal parameters. Or the control parameters can also be generated by the programmable equipment according to the simulation data of the received test items.

[0056] In one embodiment, the preset operating data may be generated when the fault monitoring logic in the hydraulic controller algorithm operates under normal conditions. Then, under the corresponding control parameters, there is corresponding preset operating data. If there is a deviation between the test data and the preset operating data, it can be considered that there is an abnormality in the fault monitoring logic in the hydraulic controller algorithm; otherwise, it is normal.

[0057] The above method can simplify the test operation and shorten the test cycle without manually operating the braking device in the vehicle or other equipment. Moreover, through the program-controlled device, the hydraulic braking system can be precisely controlled to obtain accurate test data and thus accurate test results. In addition, the program-controlled device can store or replace the simulation data of the corresponding vehicle or other equipment equipped with a braking device, so that the braking device of the corresponding vehicle or equipment can be tested, improving the versatility of the test method. Further, under the condition of ensuring the accuracy of the test results, the test of braking devices of different specifications is simplified.

[0058] Based on the above Figure 4 method flow, an embodiment of the present application provides a method for testing brake fluid leakage of a hydraulic braking system. The control parameters include the first electric cylinder stroke and the first current value. In step 401, based on the program-controlled device, the control parameters of the brake control module and the transfer hydraulic module in the hydraulic braking system are adjusted, including: Based on the program-controlled device, the first electric cylinder stroke corresponding to the program-controlled electric cylinder in the brake control module and the first current value of the corresponding solenoid valve in the transfer hydraulic module are adjusted. The program-controlled electric cylinder is used to provide a stroke input to the hydraulic braking system, and the hydraulic controller pushes the brake fluid in the pipeline according to this input. The solenoid valve is used to control the volume flow rate of the brake fluid in the pipeline; In step 402, the test data generated by the hydraulic controller in the brake control module under the control parameters is collected, including: for each solenoid valve included in the transfer hydraulic module, the following steps are executed: Open the selected solenoid valve, collect the first liquid flow rate, the first liquid volume, and the valve opening duration in the pipeline when the selected solenoid valve is at different first current values, and record the corresponding first current value and its corresponding first liquid flow rate, first liquid volume, and valve opening duration as a set of test data.

[0059] In one embodiment, the brake fluid leakage test process is as follows: Step 501: The program-controlled device pushes the EHB brake pedal and maintains it at a set position (the brake pedal displacement can be 5mm, 10mm, 15mm, etc., which can be set as needed, and the specific setting of the displacement is not limited here). The EHB converts the brake pedal displacement into the pressure of the hydraulic braking system. The hydraulic controller feeds back the collected pressure of the hydraulic braking system to the program-controlled device through the communication bus with the program-controlled device (the line connecting the program-controlled device and each component in the hydraulic braking system). The program-controlled device determines that its pressure control reaches a stable state based on the change in the pressure value. Here, the embodiment of the present application provides the relationship data between the electric cylinder stroke and the pressure in the hydraulic controller under standard conditions, as shown in Table 2, and the corresponding line chart of Table 2 is shown in Figure 5 :

[0060] Table 2 Step 502: The program-controlled device controls a single left rear / right front / left front / right rear solenoid valve to open, controls the solenoid valve current through the current control board, and adjusts the solenoid valve flow rate; meanwhile, it collects the data of the hydraulic flowmeter and the electronic liquid level gauge. Among them, different currents control the brake fluid leakage speed. That is to say, each time it adjusts for a solenoid valve, takes the current of the solenoid valve as a variable. When the solenoid valve is at different current values, under a certain electric cylinder stroke and hydraulic controller pressure, the corresponding brake fluid flow rate, brake fluid leakage amount, valve opening duration, and generated alarm time of the solenoid valve.

[0061] Step 503: The program-controlled device real-time collects the EHB leakage monitoring status; when it monitors that the EHB triggers a leakage fault, it records the solenoid valve current, the hydraulic flowmeter flow rate, the total brake fluid leakage amount, and the valve opening duration as a set of test data.

[0062] Step 504: Adjust the control current of different solenoid valves, repeat Steps 501 to 503, record the measurement data, and draw a curve. As shown in Table 3 below, it is the test result data provided by the embodiment of the present application:

[0063] Table 3 Step 505: Control different brake pedal displacement positions, repeat Steps 501 to 504, record the measurement data, and draw a curve.

[0064] Step 506: Select the left rear / right front / left front / right rear solenoid valves for testing in turn, and repeat Steps 501 to 505.

[0065] Based on the test method of the hydraulic braking system of the present application, the entire test process can be programmed to achieve automation.

[0066] Based on the above brake fluid leakage test method for a hydraulic brake system, an embodiment of the present application provides a brake fluid leakage test method when a first liquid flow exceeds a preset flow threshold, further comprising: The first alarm data of the hydraulic controller in the brake control module is collected, and the first liquid flow exceeding the preset flow threshold and its corresponding first liquid volume, first current value, valve opening time, and the first alarm data are recorded as a set of test data.

[0067] In one embodiment, the brake fluid rapid leakage judgment condition is: after the brake fluid leakage rate reaches 0.5 ml / s and the leakage time is 500 ms, the hydraulic controller should issue a brake fluid leakage alarm message. For example, the data in Table 2 above can be compared with the leakage calibration parameters.

[0068] Based on the above brake fluid leakage test method for a hydraulic brake system, an embodiment of the present application provides a brake fluid leakage test method when a first liquid volume exceeds a preset volume threshold, further comprising: The second alarm data of the hydraulic controller in the brake control module is collected, and the first liquid volume exceeding the preset volume threshold and its corresponding first liquid flow, first current value, valve opening time, and the second alarm data are recorded as a set of test data.

[0069] In one embodiment, the brake fluid slow leakage judgment condition is: after the total amount of brake fluid leakage exceeds 1 ml, the hydraulic controller should issue a brake fluid leakage alarm message. For example, the data in Table 2 above can be compared with the leakage calibration parameters.

[0070] Based on the above Figure 4 The method flow in the embodiment of the present application provides a residual air test method for a hydraulic brake system, wherein the control parameters include a second electric cylinder stroke and a second current value. In step 401, based on a program-controlled device, the control parameters of a brake control module and a transfer hydraulic module in the hydraulic brake system are adjusted, including: Based on the program-controlled device, the second current value of each of the multiple solenoid valves in the transfer hydraulic module is adjusted, and the second electric cylinder stroke corresponding to the program-controlled electric cylinder in the brake control module is adjusted until the brake fluid in the pipeline reaches the target liquid volume. The program-controlled electric cylinder is used to provide pressure to the hydraulic brake system to push the brake fluid in the pipeline, and the solenoid valve is used to control the volume flow of the brake fluid in the pipeline; Close multiple solenoid valves, open the air intake solenoid valve in the transfer hydraulic module, and at the same time control the electric cylinder stroke of the programmable electric cylinder to return to the initial value, and close the air intake solenoid valve when the pressure environment of the hydraulic brake system meets the set pressure conditions.

[0071] Based on the above residual air test method for the hydraulic braking system, the control parameters further include the third electric cylinder stroke. In step 402, the test data generated by the hydraulic controller in the braking control module under the control parameters is collected, including: Collect the target liquid volume, and the corresponding braking pressure data of the hydraulic controller under different third electric cylinder strokes, and record the target liquid volume, the third electric cylinder stroke, and their corresponding braking pressure data as a set of test data. The hydraulic controller is used to distribute the pressure in the hydraulic braking system.

[0072] In one embodiment, the steps of the residual air test for the hydraulic braking system are as follows: Step 601: The program control device controls the left rear / right front / left front / right rear solenoid valves to open, adjusts the solenoid valve current through the current control board, and controls the solenoid valve flow rate; meanwhile, the program control device collects the data of the electronic liquid level gauge.

[0073] Step 602: The program control device controls the electric cylinder to push the EHB brake pedal and maintain it at the set position (5 mm), and meanwhile, the program control device collects the total amount of brake fluid of the electronic liquid level gauge. When the target brake fluid volume is reached (example: 2 ml), the left rear / right front / left front / right rear solenoid valves are closed.

[0074] Step 603: The program control device controls the air solenoid valve to open, and at the same time controls the electric cylinder to return to the position where the EHB brake pedal is not depressed (0 mm). At this time, due to the return of the electric cylinder, the hydraulic controller will also suck back the brake fluid. Since the air solenoid valve is open, a certain amount of air will be inhaled. When the hydraulic pressure of the braking system stabilizes to 0 bar and lasts for 1 s, the air solenoid valve is closed.

[0075] Step 604: The program control device pushes the EHB brake pedal and maintains it at the set positions (5 mm, 10 mm, 15 mm), and determines that its control pressure reaches a stable state through the braking pressure feedback by the hydraulic controller; Step 605: Repeat step 4), adjust different brake pedal positions. Record the measurement data.

[0076] Step 606: The program control sequentially opens the left rear / right front / left front / right rear four solenoid valves, and at the same time controls the electric cylinder to push the brake pedal push rod of the EHB, so that the brake fluid flows from the oil pot of the hydraulic controller, passes through the four solenoid valves, flows through the hydraulic flow meter, and enters the electronic liquid level gauge, completing the filling and exhausting of the brake fluid in the measurement circuit.

[0077] Step 607: Repeat steps 1) to 6), adjust different brake fluid discharge amounts until the detection of the residual air test threshold of the braking system is completed. Record the measurement data.

[0078] The embodiment of the present application provides an example of test results, as shown in Table 4 below:

[0079] Table 4 Based on the above residual air test method for the hydraulic braking system, an embodiment of the present application provides a residual air test method when the target liquid volume exceeds a preset volume threshold, further including: Collect the third alarm data of the hydraulic controller, and record the third alarm data and its corresponding third electric cylinder stroke, braking pressure data, and target liquid volume as a set of test data.

[0080] In one embodiment, the residual air alarm condition is that when the residual air in the brake pipeline exceeds 4 ml, the EHB will send out a residual air alarm signal within 500 ms. Then, exemplarily, it can be compared based on the data in Table 3 above and the residual air calibration parameters.

[0081] In the above various residual air test methods, after completing data collection, it further includes: Based on the programmable equipment, turn on multiple solenoid valves included in the transfer hydraulic module, and adjust the electric cylinder stroke corresponding to the programmable electric cylinder in the brake control module to perform brake fluid filling and air exhaust for the hydraulic braking system.

[0082] Based on the above architecture and the corresponding test method processes, an embodiment of the present application provides a pre-test preparation method. Before adjusting the control parameters of the brake control module and the transfer hydraulic module in the hydraulic braking system based on the programmable equipment in step 401, it further includes: Testing and confirming that the liquid consumption curve of the hydraulic braking system meets the preset curve conditions.

[0083] In one embodiment, the test preparation: 1) Replace the brake caliper and brake pipeline, select the original vehicle brake caliper and brake pipeline of the target vehicle, and exhaust and fill the brake fluid for the entire brake pipeline. Confirm that the liquid consumption curve of the hydraulic system in the test bench is consistent with that of the whole vehicle, which can be determined by measuring the pressure-volume curve, and check the liquid consumption of the hydraulic braking system, with a recommended error of ±10%. As Figure 6 shown, it is a schematic diagram of a calibrated pressure-volume curve provided by an embodiment of the present application (ordinate brake fluid leakage volume (milliliters) - volume [ml], abscissa pressure (bar) - pressure [bar], where Figure 6 (a) is the pressure-volume curve for testing the hydraulic pipeline leakage of the front wheel braking system (Front Brake (incl bose + pipo)), Figure 6 (b) is the pressure-volume curve for testing the hydraulic pipeline leakage of the rear wheel braking system (rear Brake (incl bose + pipo))).

[0084] 2) Control the left rear / right front / left front / right rear four solenoid valves to open in sequence. At the same time, control the programmable electric cylinder to push the brake pedal push rod of the EHB, so that the brake fluid flows from the oil pot of the hydraulic controller, through the four solenoid valves, through the hydraulic flowmeter, and into the electronic liquid level gauge, completing the filling and exhausting of the brake fluid in the measurement circuit.

[0085] For the entire above test process, including test preparation, brake fluid leakage test, and residual air test of the braking system, it can be automated by programming in the programmable equipment. It can provide the verification of leakage parameters to the greatest extent, form a rapid closed-loop test; improve the accuracy and coverage of fault diagnosis of the braking control system; effectively shorten the test time of faults and ensure the running safety of the vehicle. It can achieve multi-dimensional fault diagnosis of system components, with strong versatility and expandability. It provides strong support for the maintenance and management of the system and reduces the maintenance cost.

[0086] Those skilled in the art should understand that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0087] The present application is described with reference to the flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to the present application. It should be understood that each process and / or block in the flowchart and / or block diagram can be implemented by computer program instructions, as well as the combination of processes and / or blocks in the flowchart and / or block diagram. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices generate means for implementing the functions specified in Figure 1 one process or multiple processes and / or blocks Figure 1 one block or multiple blocks.

[0088] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory generate a manufactured article including instruction means, and the instruction means implements the functions specified in Figure 1 one process or multiple processes and / or blocks Figure 1 one block or multiple blocks.

[0089] These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus, so that a series of operation steps are performed on the computer or other programmable apparatus to produce a computer-implemented process, thereby providing instructions for implementing the functions specified in one process or a plurality of processes and / or blocks Figure 1 one process or a plurality of processes and / or blocks Figure 1 in the one block or a plurality of blocks.

[0090] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application is also intended to include these modifications and variations.

Claims

1. A test method for a hydraulic controller in a braking system, characterized in that, The method includes: Based on a programmable device, adjusting the control parameters of a brake control module and a transfer hydraulic module in a hydraulic brake system, where the brake control module is used to deliver brake fluid to a pipeline in the hydraulic brake system, and the transfer hydraulic module is used to control the volume flow rate of the brake fluid; Collecting test data generated by a hydraulic controller in the brake control module under the control parameters, where the test data is used to characterize the operating condition of the hydraulic controller under the control parameters; Analyzing the corresponding test results of the test data based on preset operating data, where the preset operating data is performance standard data for testing the performance of the hydraulic controller, and the test results are used to characterize whether the hydraulic controller meets the performance requirements.

2. The method according to claim 1, wherein The control parameters include a first electric cylinder stroke and a first current value. The adjusting the control parameters of the brake control module and the transfer hydraulic module in the hydraulic brake system based on the programmable device includes: Based on the programmable device, adjusting the first electric cylinder stroke corresponding to a programmable electric cylinder in the brake control module and the first current value of a corresponding solenoid valve in the transfer hydraulic module. The programmable electric cylinder is used to provide a stroke input to the hydraulic brake system, and the hydraulic controller pushes the brake fluid in the pipeline according to this input. The solenoid valve is used to control the volume flow rate of the brake fluid in the pipeline; The collecting the test data generated by the hydraulic controller in the brake control module under the control parameters includes: For each solenoid valve included in the transfer hydraulic module, performing the following steps: Opening the selected solenoid valve, collecting the first liquid flow rate, the first liquid volume, and the valve opening duration in the pipeline when the selected solenoid valve is at different first current values, and recording the corresponding first current value and its corresponding first liquid flow rate, first liquid volume, and valve opening duration as a set of test data.

3. The method according to claim 2, characterized in that, When the first liquid flow rate exceeds a preset flow rate threshold, it further includes: Collecting the first alarm data of the hydraulic controller in the brake control module, and recording the first liquid flow rate exceeding the preset flow rate threshold, its corresponding first liquid volume, first current value, valve opening duration, and the first alarm data as a set of test data.

4. The method according to claim 2, wherein When the first liquid volume exceeds a preset volume threshold, it further includes: Collecting the second alarm data of the hydraulic controller in the brake control module, and recording the first liquid volume exceeding the preset volume threshold, its corresponding first liquid flow rate, first current value, valve opening duration, and the second alarm data as a set of test data.

5. The method according to claim 1, characterized in that, The control parameters include a second electric cylinder stroke and a second current value. The adjusting the control parameters of the brake control module and the transfer hydraulic module in the hydraulic brake system based on the programmable device includes: Based on the programmable device, adjust the second current value of each of the multiple solenoid valves in the transfer hydraulic module, and adjust the second cylinder stroke corresponding to the programmable electric cylinder in the brake control module until the brake fluid in the pipeline reaches the target liquid volume. The programmable electric cylinder is used to provide pressure to the hydraulic brake system to push the brake fluid in the pipeline, and the solenoid valve is used to control the volume flow rate of the brake fluid in the pipeline; Close the multiple solenoid valves, open the intake solenoid valve in the transfer hydraulic module, at the same time control the cylinder stroke of the programmable electric cylinder to return to the initial value, and close the intake solenoid valve when the pressure environment of the hydraulic brake system meets the set pressure condition.

6. The method according to claim 5, characterized in that, The control parameters further include a third cylinder stroke. Collect the test data generated by the hydraulic controller in the brake control module under the control parameters, including: Collect the target liquid volume, and the corresponding brake pressure data of the hydraulic controller under different third cylinder strokes, and record the target liquid volume, the third cylinder stroke and their corresponding brake pressure data as a set of test data. The hydraulic controller is used to distribute the pressure in the hydraulic brake system.

7. The method according to claim 6, wherein When the target liquid volume exceeds the preset volume threshold, it further includes: Collect the third alarm data of the hydraulic controller, and record the third alarm data, its corresponding third cylinder stroke, brake pressure data and the target liquid volume as a set of test data.

8. The method according to any one of claims 5 to 7, characterized in that, After the data collection is completed, it further includes: Based on the programmable device, open the multiple solenoid valves included in the transfer hydraulic module, and adjust the cylinder stroke corresponding to the programmable electric cylinder in the brake control module to fill and exhaust the brake fluid in the hydraulic brake system.

9. The method according to any one of claims 1-7, characterized in that, Before adjusting the control parameters of the brake control module and the transfer hydraulic module in the hydraulic brake system based on the programmable device, it further includes: Test and confirm that the liquid consumption curve of the hydraulic brake system meets the preset curve condition.

10. A test device for a hydraulic controller in a braking system, characterized in that, The test device includes a programmable device and a hydraulic brake system. The hydraulic brake system includes a brake control module and a transfer hydraulic module, including: The programmable device is electrically connected to the brake control module and the transfer hydraulic module respectively; The brake control module is used to deliver brake fluid to the pipeline in the hydraulic brake system; The transfer hydraulic module is used to control the volume flow rate of the brake fluid; The programmable device is used to adjust the control parameters of the brake control module and the transfer hydraulic module, and collect the test data generated by the hydraulic controller in the brake control module under the control parameters. The test data is used to characterize the operation of the hydraulic controller under the control parameters; based on the preset operation data, analyze the corresponding test results of the test data. The test results are used to characterize whether the hydraulic controller meets the performance requirements. The preset operation data is the performance standard data for testing the performance of the hydraulic controller.

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