Electronic brake control unit signal test system

Abstract

The invention relates to an electronic brake control unit signal test system, which comprises a signal output module connected with an electronic brake control unit to be tested and used for inputting various types of detection signals to the electronic brake control unit to be tested; the signal conditioning module is connected with the signal output module and the to-be-detected electronic brake control unit, receives and adjusts the detection signal, sends the processed detection signal to the to-be-detected electronic brake control unit, receives a feedback signal generated after the to-be-detected electronic brake control unit obtains the detection signal, adjusts and sends out the feedback signal; the signal acquisition module is connected with the signal conditioning module and the to-be-tested electronic brake control unit and is used for acquiring a feedback signal; and the signal processing module is respectively connected with the to-be-tested electronic brake control unit and the signal acquisition module, receives the feedback signal, compares the feedback signal with at least one type of judgment data, and outputs a test result. According to the invention, the detection of the electronic brake control unit is more perfect, and the test requirements are met.

Description

Technical Field

[0001] This application relates to the field of rail transit, and particularly to a signal test system for an electronic brake control unit. Background Art

[0002] The electronic brake control unit is the most core control component of the braking system of rail transit vehicles. It consists of a brake anti-skid control board and an interface board, and mainly includes digital input / output signals, analog input / output signals, frequency input / output signals, and communication signals, etc. It has functions such as brake control, anti-skid control, network communication function, brake management function, and fault recording. It can accurately and stably control the brake cylinder pressure according to the air braking force requirement, and realize the train braking control function. Its various performances are directly related to the safety of train operation, and full tests must be carried out before leaving the factory.

[0003] In the prior art, a test system and a test method for an electronic brake control unit are disclosed. The present invention is externally connected to a host computer that can monitor the operation of the test system, and includes a power supply module that provides electrical energy for the test system, and an interface test module, a control test module, and a communication test module that are all electrically connected to the power supply module. Among them, the interface test module is set corresponding to the interface module of the electronic brake control unit, the control test module is set corresponding to the control module of the electronic brake control unit, and the communication test module is set corresponding to the communication module of the electronic brake control unit; the interface test module, the control test module, and the communication test module are all connected through a CAN bus.

[0004] In the related technology, the test of the electronic brake control unit is relatively limited, the function test of the electronic brake control unit is not comprehensive, and signal crosstalk caused by power supply interference is likely to occur during the detection process, and the overall reliability and test accuracy of the system are relatively low. Summary of the Invention

[0005] The embodiments of this application provide a signal test system for an electronic brake control unit to at least solve the problems that the function test of the electronic brake control unit in the related technology is not comprehensive, reduce the signal crosstalk caused by power supply interference during the detection process, and improve the overall reliability and test accuracy of the system.

[0006] In the first aspect, the embodiments of this application provide a signal test system for an electronic brake control unit. The test system is used to detect whether the signals of the electronic brake control unit to be tested are normal, and includes:

[0007] A signal output module, connected to the electronic brake control unit to be tested, and configured to input various types of detection signals to the electronic brake control unit to be tested;

[0008] The signal conditioning module is respectively connected to the signal output module and the electronic brake control unit under test, and is configured to receive the detection signal, perform signal conditioning processing on the detection signal, send the processed detection signal to the electronic brake control unit under test, and receive the feedback signal generated by the electronic brake control unit under test after obtaining the detection signal, and perform signal conditioning processing on the feedback signal and send it out;

[0009] The signal acquisition module is connected to the signal conditioning module and the electronic brake control unit under test, and is configured to acquire the feedback signal and the feedback signal that has undergone signal conditioning processing;

[0010] The signal processing module is respectively connected to the electronic brake control unit under test and the signal acquisition module, and is configured to receive the feedback signal and the feedback signal that has undergone signal conditioning processing, compare the feedback signal and the feedback signal that has undergone signal conditioning processing with at least one type of judgment data, and output the test result.

[0011] Through the division of labor and cooperation of multiple modules, it can process different types of detection signals and feedback signals, accurately judge the signal status of the electronic brake control unit, improve the reliability and comprehensiveness of detection, and provide a strong guarantee for the quality detection of the electronic brake control unit.

[0012] In some embodiments, the detection signal includes a high-level signal, and the feedback signal includes a relay output signal, a relay state, a first output voltage, and a first self-check information. During the digital quantity signal test process, the signal output module is further configured to input a high-level signal to the electronic brake control unit under test;

[0013] The signal conditioning module is further configured to receive the relay output signal generated by the electronic brake control unit under test after obtaining the high-level signal, perform step-down processing on the relay output signal and send it out;

[0014] The signal acquisition module is further configured to acquire the relay state and the first output voltage of the electronic brake control unit under test;

[0015] The signal processing module is further configured to receive the relay state, the first output voltage, and the relay output signal after step-down processing, and judge whether the first self-check information, the relay state, the first output voltage, and the relay output signal after step-down processing are all within the first judgment data threshold, and output the test result.

[0016] By comparing multiple digital quantity signals of the feedback with the threshold, it can accurately judge the working state of the electronic brake control unit under test when the digital quantity signal is input, and improve the accuracy and effectiveness of the digital quantity signal test.

[0017] In some of these embodiments, the detection signal includes a first analog output signal, and the feedback signal includes second self-check information, a second output voltage, and / or a first output current. During the analog signal test, the signal output module is further configured to input the first analog output signal to the electronic brake control unit under test;

[0018] The signal conditioning module is further configured to, in the case where the electronic brake control unit under test generates a first output current after obtaining the first analog output signal, receive the first output current and convert the first output current into a corresponding third output voltage;

[0019] The signal acquisition module is further configured to acquire the third output voltage or the second output voltage generated by the electronic brake control unit under test after receiving the first analog output signal;

[0020] The signal processing module is further configured to receive the second output voltage or the third output voltage, and the second self-check information, and determine whether the second output voltage or the third output voltage and the second self-check information are both within the second judgment data threshold, and output a test result.

[0021] Accurately processing and analyzing different types of feedback signals generated by the electronic brake control unit under test under analog signal input provides an effective solution for analog signal testing and ensures the accuracy of analog signal testing.

[0022] In some of these embodiments, the detection signal includes a second analog output signal, and the feedback signal includes third self-check information, a fourth output voltage, and / or a second output current. During the frequency signal test, the signal output module is further configured to input an adjustable second analog output signal to the electronic brake control unit under test, and the second analog output signal includes a voltage pulse signal and a current pulse signal;

[0023] The signal conditioning module is further configured to, in the case where the second output current generated by the electronic brake control unit under test after receiving the second analog output signal, receive the second output current and convert the second output current into a corresponding fifth output voltage;

[0024] The signal acquisition module is further configured to acquire the fifth output voltage or the fourth output voltage generated by the electronic brake control unit under test after receiving the second analog output signal;

[0025] The signal processing module is further configured to receive the fourth output voltage or the fifth output voltage, and the third self-check information, and determine whether the fourth output voltage or the fifth output voltage and the third self-check information are both within the third judgment data threshold, and output a test result.

[0026] An adapted test process is designed for frequency signal testing, which can process different forms of feedback signals, accurately detect the working conditions of the electronic brake control unit under test when receiving frequency signals, and improve the reliability and accuracy of frequency signal testing.

[0027] In some of these embodiments, during the multi-signal coupling test, the signal output module includes a fault simulation circuit, and a first switch and a second switch are provided on the fault simulation circuit.

[0028] When the first switch is closed and the second switch is closed, the detection signal includes a solenoid valve short circuit test instruction, the feedback signal includes a sixth output voltage and a fourth self-check information, and the signal conditioning module is further configured to receive the sixth output voltage generated after the electronic brake control unit under test receives the detection signal, step down the sixth output voltage and send it out;

[0029] The signal acquisition module is further configured to acquire the sixth output voltage after step-down processing at this time;

[0030] The signal processing module is further configured to receive the fourth self-check information and the sixth output voltage after step-down processing acquired at this time, determine whether both the fourth self-check information and the sixth output voltage after step-down processing at this time are within the fourth judgment data threshold, and output a test result.

[0031] By simulating specific fault scenarios, it is possible to accurately detect the response of the electronic brake control unit under test to a solenoid valve short circuit fault under complex signal conditions, and improve the pertinence and effectiveness of multi-signal coupling testing.

[0032] In some of these embodiments, the detection signal includes a solenoid valve open circuit test instruction, the feedback signal includes a seventh output voltage and a fifth self-check information. When the first switch is open or closed and the second switch is open, the signal conditioning module is further configured to receive the seventh output voltage generated after the electronic brake control unit under test receives the detection signal, step down the seventh output voltage and send it out;

[0033] The signal acquisition module is further configured to acquire the seventh output voltage after step-down processing at this time;

[0034] The signal processing module is further configured to receive the fifth self-check information and the seventh output voltage after step-down processing acquired at this time, determine whether both the fifth self-check information and the seventh output voltage after step-down processing at this time are within the fifth judgment threshold, and output a test result.

[0035] By simulating a solenoid valve open circuit fault scenario, accurately detect the response of the electronic brake control unit under test to a solenoid valve open circuit fault, and enhance the detection ability of multi-signal coupling testing for solenoid valve open circuit faults.

[0036] In some of these embodiments, the detection signal includes a solenoid valve normal test instruction, and the feedback signal includes frequency information, an eighth output voltage, duty cycle information, and sixth self-check information. When the second switch is closed and the first switch is open, the signal conditioning module is further configured to receive the frequency information, the eighth output voltage, and the duty cycle information generated after the detection signal is received by the electronic brake control unit under test, step down the frequency information, the eighth output voltage, and the duty cycle information, and send them out;

[0037] The signal acquisition module is further configured to acquire the frequency information, the eighth output voltage, and the duty cycle information after the step-down process at this time;

[0038] The signal processing module is further configured to receive the sixth self-check information, the acquired frequency information, the eighth output voltage, and the duty cycle information after the step-down process at this time, determine whether the sixth self-check information, the frequency information, the eighth output voltage, and the duty cycle information after the step-down process at this time are all within the sixth judgment threshold, and output a test result.

[0039] By acquiring and analyzing multiple feedback signals, accurately evaluate the performance of the electronic brake control unit under test in the normal working state of the solenoid valve, and ensure the comprehensiveness of the multi-signal coupling test for detecting the normal working state of the solenoid valve.

[0040] In some of these embodiments, it further includes:

[0041] A power supply module, which is respectively connected to the signal output module, the electronic brake control unit under test, the signal conditioning module, the signal acquisition module, and the signal processing module, and is configured to supply power to the signal output module, the electronic brake control unit under test, the signal conditioning module, the signal acquisition module, and the signal processing module respectively, and the power supply lines corresponding to the signal output module, the electronic brake control unit under test, the signal conditioning module, the signal acquisition module, and the signal processing module are independently regulated in an electrically isolated state.

[0042] This system adopts a modular power supply design, and a programmable power supply distribution unit is configured in the power supply module to achieve independent power supply control for multiple modules. Power supply lines are provided between multiple modules and the power supply module, and multiple power supply lines are independently regulated in an electrically isolated state, effectively ensuring that the power supply systems between different detection units are completely decoupled, thereby avoiding signal crosstalk problems caused by power supply interference during the detection process, and improving the overall reliability and test accuracy of the system.

[0043] In some of these embodiments, the electronic brake control unit under test includes a power supply board, and the test system further includes:

[0044] The power supply test module is connected to the power supply board and is configured to load a preset voltage to the power supply board, detect the power supply output, impact current or output ripple, and output the test result according to the power supply output, impact current or output ripple.

[0045] Adding a power supply test module can perform special tests on the power supply board of the electronic brake control unit to be tested, and comprehensively evaluate the power supply performance of the electronic brake control unit to be tested.

[0046] In some embodiments, it also includes:

[0047] The adapter module has one end connected to the signal conditioning module and the other end connected to the electronic brake control unit to be tested, including multiple types of connector interfaces, and is configured to open the corresponding type of connector interface according to the type of detection signal to transmit information to the electronic brake control unit to be tested; according to the output voltage, output current, feedback signal and self-test information generated by the electronic brake control unit to be tested, open the corresponding type of connector interface to transmit information to the signal conditioning module.

[0048] This application constructs a standardized signal transfer path through a transfer module, which significantly improves test efficiency and equipment compatibility. The transfer module can be set to use an industrial-grade connector interface of uniform specifications to standardize the input / output signals of the signal conditioning module and realize the plug-and-play function of the test adapter. This modular design allows different EBCUs to be tested to complete the test switching by simply replacing the corresponding adapter, eliminating the work link of frequent manual wiring operations in traditional testing, and improving the versatility and convenience of the test system.

[0049] Compared with the related art, the electronic brake control unit signal testing system provided in the embodiment of the present application can fully detect the performance of the electronic brake control unit through the cooperation of multiple modules and the combination of detection signals and feedback signals, improve the test reliability, versatility and compatibility, increase the test rate, and meet the testing requirements of the electronic brake control unit.

[0050] Details of one or more embodiments of the present application are set forth in the following drawings and description to make other features, objects, and advantages of the present application more readily apparent. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0052] Figure 1 is a structural framework diagram of an electronic brake control unit signal test system according to an embodiment of the present application;

[0053] Figure 2 It is another structural framework diagram of the electronic brake control unit signal test system according to an embodiment of the present application;

[0054] Figure 3 It is another structural framework diagram of the electronic brake control unit signal test system according to an embodiment of the present application;

[0055] Figure 4 It is another structural framework diagram of the electronic brake control unit signal test system according to an embodiment of the present application;

[0056] Figure 5 It is a structural framework diagram of the hardware architecture of the electronic brake control unit signal test system according to an embodiment of the present application;

[0057] Figure 6 It is a test schematic diagram of the electronic brake control unit signal test system according to an embodiment of the present application;

[0058] Figure 7 It is another test schematic diagram of the electronic brake control unit signal test system according to an embodiment of the present application;

[0059] Figure 8 It is another test schematic diagram of the electronic brake control unit signal test system according to an embodiment of the present application;

[0060] Figure 9 It is another test schematic diagram of the electronic brake control unit signal test system according to an embodiment of the present application;

[0061] Figure 10 It is a structural block diagram of the electronic brake control unit signal test platform according to an embodiment of the present application;

[0062] Figure 11 It is a channel control structure diagram of the electronic brake control unit signal test platform according to an embodiment of the present application;

[0063] Figure 12 It is a flowchart of the electronic brake control unit signal test method according to an embodiment of the present application;

[0064] Figure 13 It is a usage flowchart of the electronic brake control unit signal test system according to an embodiment of the present application.

[0065] In the figure:

[0066] 101. Signal output module; 102. Signal conditioning module; 103. Signal acquisition module; 104. Signal processing module; 105. Electronic brake control unit to be tested. Detailed implementation manners

[0067] In order to make the objectives, technical solutions and advantages of the present application more clear and understandable, the present application will be described and explained below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments provided in the present application without creative efforts fall within the scope of protection of the present application.

[0068] Obviously, the accompanying drawings in the following description are only some examples or embodiments of the present application. For those of ordinary skill in the art, without creative efforts, the present application can also be applied to other similar scenarios based on these drawings. In addition, it can also be understood that although the efforts made in this development process may be complex and lengthy, for those of ordinary skill in the art related to the content disclosed in the present application, some designs, manufacturing or production changes made on the basis of the technical content disclosed in the present application are only conventional technical means and should not be understood as the content disclosed in the present application being insufficient.

[0069] Referring to "embodiments" in the present application means that the specific features, structures or characteristics described in connection with the embodiments may be included in at least one embodiment of the present application. The phrase appears in various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those of ordinary skill in the art explicitly and implicitly understand that the embodiments described in the present application can be combined with other embodiments without conflict.

[0070] Unless otherwise defined, the technical terms or scientific terms involved in this application shall have the ordinary meanings understood by those with ordinary skills in the technical field to which this application belongs. The words such as "a", "an", "one", "the" and the like involved in this application do not indicate a quantity limitation and may represent a singular or plural number. The terms "include", "comprise", "have" and any variations thereof involved in this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or modules (units) is not limited to the listed steps or units, but may further include unlisted steps or units, or may further include other steps or units inherent to these processes, methods, products or devices. The words such as "connect", "be connected", "couple" and the like involved in this application are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The "plurality" involved in this application means two or more. "And / or" describes the association relationship of associated objects and indicates that three relationships may exist. For example, "A and / or B" may represent: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally represents an "or" relationship between the front and rear associated objects. The terms "first", "second", "third" and the like involved in this application are only used to distinguish similar objects and do not represent a specific order for the objects.

[0071] The Electric Brake Control Unit (EBCU) is the most core control component of the braking system of rail transit vehicles. The EBCU adopts an independent chassis and is composed of a braking anti-skid control board and an interface board, mainly including digital input and output signals, analog input and output signals, frequency input and output signals, and communication signals, etc.

[0072] The electronic brake control unit of rail transit vehicles is mainly responsible for collecting speed, collecting sensor data of the pneumatic brake control unit, communicating with the train control and management system, the human-machine interface, and other bus control units, and controlling the pneumatic brake control unit to achieve brake control and output control signals to the vehicle, etc.

[0073] The electronic brake control unit has interfaces such as speed sensor acquisition, pressure sensor acquisition, solenoid valve control, digital input, and digital output. The main functional modules include power supply and power detection, CAN (Controller Area Network) bus communication, coding acquisition, analog signal (speed, pressure, etc.) input and output, digital signal input and output, frequency input and output and other functional modules. According to the principle of the EBCU, a test requirement list is sorted out, mainly including analog signals, speed signals, frequency signals, digital signals, etc.

[0074] According to the principle of the EBCU, a list of test requirements is sorted out, mainly including analog signals, speed signals, frequency signals, digital signals, etc., as shown in Table 1.

[0075] Table 1 EBCU Test Requirement Table for Rail Transit Vehicles

[0076]

[0077]

[0078] The EBCU has functions such as brake control, anti-skid control, network communication, brake management, and fault recording. It can accurately and stably control the brake cylinder pressure according to the air braking force requirement to achieve the train brake control function. Its various performances are directly related to the safety of train operation, and sufficient tests must be carried out before leaving the factory.

[0079] To solve the above problems, this application proposes an electronic brake control unit signal test system, which can realize various functions and performance tests such as signal acquisition, output, control, communication, and power supply detection of the EBCU of rail transit vehicles. An EBCU test system for rail transit vehicles is built, which can complete automatic and standardized tests at the PCBA board level, module level, and whole machine level of the EBCU and provide test reports.

[0080] Among them, the board-level test is to test the bare board, focusing on the function detection of each component on the circuit board. The module-level test is to test a single functional module, focusing on the input and output function test of various signals of a single module. The whole machine-level test is to test the whole machine of the EBCU, focusing on the test of various functions and performances of the whole machine.

[0081] This embodiment provides an electronic brake control unit signal test system. Figure 1 It is the structural block diagram of the electronic brake control unit signal test system according to the embodiment of the present application, as Figure 1 shown. The test system is used to detect whether the signals of the to-be-tested electronic brake control unit 105 are normal, including:

[0082] A signal output module 101, connected to the to-be-tested electronic brake control unit 105, is configured to input various types of detection signals to the to-be-tested electronic brake control unit 105.

[0083] A signal conditioning module 102, respectively connected to the signal output module 101 and the to-be-tested electronic brake control unit 105, is configured to receive the detection signals, perform signal conditioning processing on the detection signals, send the processed detection signals to the to-be-tested electronic brake control unit 105, and receive the feedback signals generated by the to-be-tested electronic brake control unit 105 after obtaining the detection signals, and perform signal conditioning processing on the feedback signals and send them out.

[0084] The signal acquisition module 103, connected to the signal conditioning module 102 and the electronic brake control unit 105 to be tested, is configured to acquire feedback signals and the feedback signals that have undergone signal conditioning and processing.

[0085] The signal processing module 104, connected to the electronic brake control unit 105 to be tested and the signal acquisition module 103 respectively, is configured to receive the feedback signals and the feedback signals that have undergone signal conditioning and processing, compare the feedback signals and the feedback signals that have undergone signal conditioning and processing with at least one type of judgment data, and output a test result.

[0086] This test system is used to detect whether the signals of the electronic brake control unit 105 (EBCU) to be tested are normal. The signal output module 101 inputs various detection signals to the EBCU to be tested. The signal conditioning module 102 receives these detection signals and performs conditioning and processing, and then sends the processed signals to the EBCU to be tested. The EBCU to be tested generates feedback signals based on the received detection signals. The signal conditioning module 102 receives the feedback signals and performs conditioning and processing again before sending them out. The signal acquisition module 103 acquires the feedback signals and the feedback signals processed by the signal conditioning module 102. The signal processing module 104 receives these feedback signals and compares them with at least one type of judgment data, thereby outputting a test result.

[0087] This system realizes a comprehensive and systematic test of the signals of the EBCU to be tested. Through the division of labor and cooperation of multiple modules, it can process different types of detection signals and feedback signals, accurately judge the signal status of the EBCU to be tested, improve the reliability and comprehensiveness of the detection, and provide a strong guarantee for the quality detection of the EBCU to be tested.

[0088] The signal conditioning module 102 is mainly used for signal conversion and adjustment, such as converting between current signals and voltage signals, converting the levels of pulse signals and digital input / output signals, as well as amplifying and attenuating signals. The signal conditioning module 102 can be integrated into a conditioning box, and 16 groups of disconnectors are set on the front panel outside the conditioning box, which are mainly used for simulating and troubleshooting fault signals.

[0089] The signal acquisition module 103 is used to acquire the output signals of the EBCU to be tested, such as RO, ASI, FSI, etc.

[0090] Such as Figure 2 、 3 As shown in Figure 4, the electronic brake control unit signal test system further includes a bus test bench. The signal output module 101, the signal acquisition module 103, and the signal processing module 104 can be integrated into the bus test bench, and the bus test bench also includes a chassis and a controller. The bus test bench is used for inputting and outputting various signals and communicating with the EBCU, etc.

[0091] The bus test bench also includes multifunctional I / O modules for RO, BI, POP open / short circuit control, ASI current / voltage signal switching, CAN communication input / output, FPO, POP, FPI and other frequency signal input / output.

[0092] The bus test bench also includes a voltage / current output module for outputting analog voltage / current signals to test the FSI signal input function of the EBCU to be tested.

[0093] The bus test bench also includes a communication module that supports multiple communications such as CAN, RS485, RS232, MVB, and Ethernet. The communication module is responsible for issuing test instructions, feedback of test results, and detection of multiple communications. It contains multiple communication interfaces and supports multiple communication protocol tests such as CAN, RS485, RS232, MVB, and Ethernet. The test bench completes the sending of test instructions and the receiving of test results through CAN communication. After receiving the feedback signal from the EBCU to be tested, the signal processing module 104 parses it and generates a test report.

[0094] The main functions of rail transit vehicle EBCU include power supply and power detection, CAN bus communication, encoding acquisition, analog signal input and output, digital signal input and output, frequency input and output, etc.

[0095] The analog signals include but are not limited to speed and pressure.

[0096] The bus test bench is connected to the signal conditioning module 102, and the signal conditioning module 102 is connected to the adapter module, which has built-in interfaces corresponding to various types of detection signals. The adapter module is connected to the electronic brake control unit 105 to be tested through multiple dedicated cables.

[0097] The electronic brake control unit 105 to be tested includes a plurality of connectors and a power board.

[0098] like Figure 5 As shown, the present application provides a hardware architecture of an electronic brake control unit signal test system, which receives feedback signals from an EBCU to be tested, processes the feedback signals accordingly, and then inputs them into a variety of modules.

[0099] The test system also includes: a control power supply that can output 24V or 5V power to supply power to the multi-functional I / O module.

[0100] The test system further includes: a programmable power supply or a 110V power supply, a power management module, and a relay matrix. The programmable power supply or the 110V power supply outputs DC110V, 72V, or 48V power to the relay matrix via the power management module. The relay matrix receives the DC110V, 72V, or 48V power and is controlled by the multifunctional I / O module to supply power to the EBCU under test.

[0101] The test system further includes: a multiplexer switch. The test system controls the multiplexer switch through the multifunctional I / O module to select and connect to the CAN ID for information transfer and interaction with the EBCU under test.

[0102] The signal acquisition module 103 includes a digital input module, a data acquisition module, and a current acquisition module.

[0103] During the normally open point test and the normally closed point test, the EBCU under test sends an RO signal to the test system. The signal conditioning module 102 steps down and conditions the RO signal and then sends it to the digital input module.

[0104] When the EBCU under test sends an FPO signal to the test system, the signal conditioning module 102 steps down and conditions the FPO signal and then sends it to the multifunctional I / O module.

[0105] When the EBCU under test sends a POP signal to the test system, the test system injects faults and sets multiple fault modes. The signal conditioning module 102 steps down and conditions the FPO signal and then sends it to the multifunctional I / O module.

[0106] The current / voltage output module outputs a current signal to the EBCU under test. When the ASI signal generated by the EBCU under test is in a voltage signal state, the signal conditioning module 102 steps down and conditions the ASI signal and then sends it to the data acquisition module.

[0107] The multifunctional I / O module sends a detection signal. After the detection signal is stepped up and conditioned, it is sent to the EBCU under test. After receiving the detection signal, the EBCU under test generates an FPI signal.

[0108] The current / voltage output module outputs a current signal to the EBCU under test. After receiving the current signal, the EBCU under test generates an FSI signal in the form of a voltage. The FSI signal is stepped down and conditioned and then sent to the data acquisition module.

[0109] The test system supplies power to the BI signal through the relay matrix.

[0110] In addition, in information interaction, the AO voltage received by the test system is sent to the data acquisition module, and the AO current received by the test system is sent to the current acquisition module. The test system outputs the AI voltage and AI current to the EBCU under test through the current / voltage output module.

[0111] The test system includes an Ethernet communication module for supporting Ethernet communication.

[0112] The test system includes a serial communication module for supporting RS485 communication.

[0113] The test system includes a CAN communication module for supporting CAN communication.

[0114] The test system includes an MVB communication module for supporting MVB communication.

[0115] In some embodiments, the detection signal includes a high-level signal, and the feedback signal includes a relay output signal, a relay status, a first output voltage, and a first self-check information. During the digital quantity signal test, the signal output module 101 is further configured to input a high-level signal to the electronic brake control unit 105 under test.

[0116] The signal conditioning module 102 is further configured to receive the relay output signal generated by the electronic brake control unit 105 under test after obtaining the high-level signal, step down the relay output signal, and send it out.

[0117] The signal acquisition module 103 is further configured to acquire the relay status and the first output voltage of the electronic brake control unit 105 under test.

[0118] The signal processing module 104 is further configured to receive the relay status, the first output voltage, and the relay output signal after step-down processing, determine whether the first self-check information, the relay status, the first output voltage, and the relay output signal after step-down processing are all within the first judgment data threshold, and output the test result.

[0119] During the digital quantity signal test, the signal output module 101 inputs a high-level signal to the EBCU under test. After receiving the high-level signal, the EBCU under test generates feedback signals such as a relay output signal, a relay status, a first output voltage, and a first self-check information. The signal conditioning module 102 steps down the relay output signal, and the signal acquisition module 103 acquires the relay status and the first output voltage. The signal processing module 104 receives the first self-check information, the relay status, the first output voltage, and the relay output signal after step-down processing, compares these feedback signals with the first judgment data threshold, and then outputs the test result.

[0120] For the test of digital signals, the system provides a complete test process. By comparing various digital signals fed back with thresholds, it can accurately judge the working state of the EBCU under test when digital signals are input, improving the accuracy and effectiveness of digital signal testing.

[0121] The EBCU under test includes a digital input / output module, which is mainly used to complete functions such as hard-wire instruction acquisition for emergency braking and relay signal control. According to the test requirements of the BI, CANID, and RO signals of the EBCU under test, a digital signal test module is set in the electronic brake control unit signal test system. The EBCU under test outputs the RO signal, and the RO signal of the EBCU under test is a DC110V switch mechanical contact output channel. The relay is a three-wire system, including a common point, a normally open point, and a normally closed point, and is used to output indication signals such as non-relief of braking and removal of electric braking.

[0122] During the test of the normally open point and the normally closed point by the test system, the test system provides a power high level for the EBCU under test. The EBCU under test outputs signals to the test system through the relay. The test system steps down and conditions the signals and then transmits them to the signal acquisition module 103. The signal acquisition module 103 includes a DI (Digital Input) module and an AI (Analogue Input) module. The DI module is used for analogue signal input, and the AI module is used for digital signal input.

[0123] The test system includes a multi-functional I / O module. The multi-functional I / O module provides 30 channels of analogue signal input for collecting the relay status and simultaneously provides 10 channels of digital signal input for collecting voltage values.

[0124] The test schematic diagram of the RO signal is as Figure 6 shown. The test system supplies power to the EBCU under test. Vout in the test system is the output of the programmable power supply, which is consistent with the power level of the EBCU under test. The test system provides a high level for the EBCU under test and simultaneously sends a digital signal test instruction to the EBCU under test through the communication CAN bus. The EBCU under test receives the digital signal test instruction, outputs the corresponding RO signal to the test system, and returns the first self-check information to the test system through the CAN bus. The RO signal is stepped down and conditioned and then transmitted to the signal acquisition module 103. The test system analyzes whether the collected RO signal and the received first self-check information are correct and returns the test result.

[0125] Among them, step-down conditioning includes isolation and attenuation.

[0126] In some of these embodiments, the detection signal includes a first analog output signal, and the feedback signal includes second self-check information, a second output voltage, and / or a first output current. During the analog signal test, the signal output module 101 is further configured to input the first analog output signal to the electronic brake control unit 105 to be tested.

[0127] The signal conditioning module 102 is further configured to receive the first output current and convert the first output current into a corresponding third output voltage when the electronic brake control unit 105 to be tested generates the first output current after obtaining the first analog output signal.

[0128] The signal acquisition module 103 is further configured to acquire the third output voltage or the second output voltage generated by the electronic brake control unit 105 to be tested after receiving the first analog output signal.

[0129] The signal processing module 104 is further configured to receive the second output voltage or the third output voltage, and the second self-check information, and determine whether both the second output voltage or the third output voltage and the second self-check information are within the second judgment data threshold, and output a test result.

[0130] During the analog signal test, the signal output module 101 inputs the first analog output signal to the EBCU to be tested. After receiving this signal, the EBCU to be tested generates second self-check information, a second output voltage, and / or a first output current. If the first output current is generated, the signal conditioning module 102 converts it into a corresponding third output voltage. The signal acquisition module 103 acquires the third output voltage or the second output voltage, and the signal processing module 104 receives the acquired voltage and the second self-check information, compares them with the second judgment data threshold, and thus outputs a test result.

[0131] The system designs a special test mechanism for analog signals, which can accurately process and analyze different types of feedback signals generated by the EBCU to be tested under analog signal input, provides an effective solution for analog signal testing, and ensures the accuracy of analog signal testing.

[0132] The EBCU of rail transit vehicles contains various analog signals, such as brake cylinder pressure, parking cylinder pressure, etc., which are realized through current, voltage input and output signals, etc.

[0133] The multifunctional I / O module of the test system provides an analog output signal of 0 - 20 mA or 0 - 5 V, outputs it to the EBCU to be tested, and acquires the output voltage of the EBCU to be tested through the information acquisition module. If the feedback signal output by the EBCU to be tested is a current signal, the signal conditioning module 102 of the test system completes the current-voltage conversion. The signal conditioning module 102 includes a voltage / current conversion module for converting current and voltage.

[0134] The test principle of the ASI signal is as follows Figure 7 As shown, the test system powers the EBCU to be tested. The test system sends an analog signal test instruction to the EBCU to be tested through the communication CAN bus, and provides a voltage signal of 0 - 5V or a current signal of 0 - 20mA, which is sent to the EBCU to be tested through a relay. The EBCU to be tested receives the analog signal test instruction, outputs a corresponding voltage signal or current signal, and returns the second self-check information to the test system through the CAN bus. If the feedback signal output by the EBCU to be tested is a current signal, the signal conditioning module 102 of the test system completes the current-voltage conversion. An AI circuit is set in the signal acquisition module 103 of the test system to collect the output voltage of the EBCU to be tested, and analyze whether the collected output voltage and the second self-check information received from the EBCU to be tested are within a reasonable range, and return the test result.

[0135] The signal conditioning module 102 can be switched to the V / I conversion circuit through a relay to perform current-voltage conversion.

[0136] The signal conditioning module 102 includes a V / I conversion module and an attenuation module. The V / I conversion circuit is located within the V / I conversion module, and the attenuation module can be used for step-down conditioning of the feedback signal.

[0137] In some of these embodiments, the detection signal includes a second analog output signal, and the feedback signal includes third self-check information, a fourth output voltage, and / or a second output current. During the frequency signal test process, the signal output module 101 is further configured to input an adjustable second analog output signal to the electronic brake control unit 105 to be tested. The second analog output signal includes a voltage pulse signal and a current pulse signal.

[0138] The signal conditioning module 102 is further configured to, in the case of a second output current generated by the electronic brake control unit 105 to be tested after receiving the second analog output signal, receive the second output current and convert the second output current into a corresponding fifth output voltage.

[0139] The signal acquisition module 103 is further configured to collect the fifth output voltage or the fourth output voltage generated by the electronic brake control unit 105 to be tested after receiving the second analog output signal.

[0140] The signal processing module 104 is further configured to receive the fourth output voltage or the fifth output voltage, and the third self-check information, determine whether the fourth output voltage or the fifth output voltage and the third self-check information are both within the third judgment data threshold, and output the test result.

[0141] During the frequency signal test, the signal output module 101 inputs an adjustable second analog output signal to the EBCU under test, which includes a voltage pulse signal or a current pulse signal. After receiving the signal, the EBCU under test generates the third self-check information, the fourth output voltage, and / or the second output current. If the second output current is generated, the signal conditioning module 102 converts it into the corresponding fifth output voltage. The signal acquisition module 103 acquires the fifth output voltage or the fourth output voltage, and the signal processing module 104 receives the acquired voltage and the third self-check information, compares them with the third judgment data threshold, and then outputs the test result.

[0142] The system designs an adapted test process for the frequency signal test, which can process different forms of feedback signals, accurately detect the working condition of the EBCU under test when a frequency signal is input, and improve the reliability and accuracy of the frequency signal test.

[0143] The frequency signal input / output module of the EBCU under test is mainly used to complete important logic control functions such as speed acquisition and brake charging and discharging control.

[0144] The FSI signal of the EBCU under test is a current pulse signal or a voltage pulse signal. To process the FSI signal, the test system sets an analog output circuit in the multi-functional I / O module, which can adjust the voltage pulse signal or current pulse signal input to the EBCU under test according to the test requirements. At the same time, an analog input circuit is set in the signal acquisition module 103 to collect the fourth output voltage or the fifth output voltage of the EBCU under test. A digital output circuit is set in the signal conditioning module 102 to control the current / voltage switching. The test system provides a voltage pulse of 0 to 30V, which can be converted into a current pulse of 0 to 20mA through a V / I conversion circuit. The fourth output voltage or the fifth output voltage is collected through the AI circuit in the signal acquisition module 103.

[0145] The test schematic diagram of the FSI signal is as Figure 8 shown. The test system sends a frequency signal test instruction to the EBCU under test through the communication CAN bus, and provides a voltage pulse signal or a current pulse signal of 0 to 30V to be sent to the EBCU under test. The output of a larger pulse signal above 20V needs to be amplified by an amplification module. After receiving the frequency signal test instruction, the EBCU under test outputs the corresponding voltage signal and returns the third self-check information to the test system through the CAN bus. In the test system, the AI circuit in the signal acquisition module 103 acquires the fifth voltage or the fourth voltage output by the EBCU under test. The signal processing module 104 analyzes whether the acquired feedback signal and the third self-check information output by the EBCU under test received are within a reasonable range, and outputs the test result.

[0146] Among them, if the current signal is output by the EBCU to be tested, it is switched to the V / I conversion circuit by the relay of the signal conditioning module 102 in the test system to complete the current-voltage conversion.

[0147] In some embodiments, during the multi-signal coupling test, the signal output module 101 includes a fault simulation circuit, and a first switch and a second switch are arranged on the fault simulation circuit.

[0148] When the first switch is closed and the second switch is closed, the detection signal includes a solenoid valve short-circuit test instruction, the feedback signal includes a sixth output voltage and a fourth self-check information, and the signal conditioning module 102 is further configured to receive the sixth output voltage generated after the EBCU to be tested receives the detection signal, step down the sixth output voltage and send it out.

[0149] The signal acquisition module 103 is further configured to acquire the sixth output voltage after step-down processing at this time.

[0150] The signal processing module 104 is further configured to receive the fourth self-check information and the sixth output voltage after step-down processing acquired at this time, determine whether both the fourth self-check information and the sixth output voltage after step-down processing at this time are within the fourth judgment data threshold, and output a test result.

[0151] In the solenoid valve short-circuit test of the multi-signal coupling test, both the first switch and the second switch on the fault simulation circuit of the signal output module 101 are closed, and at this time, a solenoid valve short-circuit test instruction is input to the EBCU to be tested. After receiving the instruction, the EBCU to be tested generates a sixth output voltage and a fourth self-check information. The signal conditioning module 102 steps down the sixth output voltage, the signal acquisition module 103 acquires the sixth output voltage after step-down processing, and the signal processing module 104 receives the fourth self-check information and the sixth output voltage after step-down processing, and compares them with the fourth judgment data threshold, so as to output a test result.

[0152] The system provides an effective test scheme for the solenoid valve short-circuit test in the multi-signal coupling test. By simulating specific fault scenarios, it can accurately detect the response of the EBCU to be tested to the solenoid valve short-circuit fault under complex signal conditions, and improve the pertinence and effectiveness of the multi-signal coupling test.

[0153] The POP signal of the EBCU of the rail transit vehicle is a two-wire output signal, which can be used as a binary output or a PWM output.

[0154] During normal testing, the test system needs to collect voltage values, frequencies, and duty cycles. At the same time, it needs to simulate fault modes to perform open-circuit and short-circuit tests on the POP. Voltage values need to be collected during open-circuit and short-circuit tests. In the test system, the signal acquisition module 103 includes a timer / counter module. An input circuit is set in the timer / counter module to collect frequencies. Vout in the test system is the output of a programmable power supply, which is kept consistent with the power level of the EBCU under test. The signal acquisition module 103 also includes an AI acquisition module for collecting voltage values. The multi-functional I / O module in the test system includes a DO (Digital Output) circuit for controlling the on / off of switches to simulate open-circuit and short-circuit fault modes. The first switch is S1, and the second switch is S2. The control of both S1 and S2 is achieved through the cooperation of the DO circuit and a relay. At the same time, the attenuated voltage signal is connected to the AI channel for voltage acquisition.

[0155] The test schematic diagram of the POP signal is as Figure 9 shown.

[0156] When performing the solenoid valve short-circuit test, S1 is closed and S2 is closed.

[0157] During the short-circuit test, the test system powers the EBCU under test. The test system controls S1 to be closed and S2 to be closed. The test system powers the EBCU under test and simultaneously sends a solenoid valve short-circuit test command to the EBCU under test through the communication CAN bus. The EBCU under test receives the solenoid valve short-circuit test command, outputs the corresponding sixth output voltage to the test system, and returns the fourth self-check information to the test system through the CAN bus. The sixth output voltage is stepped down and conditioned by the attenuation module and then sent to the signal acquisition module 103. The signal processing module 104 of the test system analyzes whether the collected sixth output voltage and the received fourth self-check information are correct and outputs the test result.

[0158] In some of the embodiments, the detection signal includes a solenoid valve open-circuit test command, and the feedback signal includes a seventh output voltage and a fifth self-check information. In the case where the first switch is open or closed and the second switch is open, the signal conditioning module 102 is further configured to receive the seventh output voltage generated after the EBCU under test receives the detection signal, step down the seventh output voltage, and send it out.

[0159] The signal acquisition module 103 is further configured to collect the seventh output voltage after step-down processing at this time.

[0160] The signal processing module 104 is further configured to receive the fifth self-check information and the collected seventh output voltage after step-down processing at this time, determine whether both the fifth self-check information and the seventh output voltage after step-down processing at this time are within the fifth judgment threshold, and output the test result.

[0161] In the open - circuit test of the solenoid valve in the multi - signal coupling test, the first switch on the fault simulation circuit of the signal output module 101 is disconnected or closed and the second switch is disconnected. At this time, an open - circuit test instruction for the solenoid valve is input to the EBCU under test. After receiving the instruction, the EBCU under test generates a seventh output voltage and a fifth self - check information. The signal conditioning module 102 performs a step - down process on the seventh output voltage. The signal acquisition module 103 acquires the seventh output voltage after the step - down process. The signal processing module 104 receives the fifth self - check information and the seventh output voltage after the step - down process, and compares them with the fifth judgment threshold to output a test result.

[0162] The system designs a corresponding test mechanism for the open - circuit test of the solenoid valve in the multi - signal coupling test. By simulating the open - circuit fault scenario of the solenoid valve, it accurately detects the response of the EBCU under test to the open - circuit fault of the solenoid valve, enhancing the detection ability of the multi - signal coupling test for the open - circuit fault of the solenoid valve.

[0163] The test schematic diagram of the POP signal is as Figure 9 shown.

[0164] When performing the open - circuit test of the solenoid valve, S2 is disconnected, and S1 is closed or disconnected.

[0165] During the open - circuit test, the test system supplies power to the EBCU under test. The test system controls S2 to be disconnected, and S1 to be closed or disconnected. The test system supplies power to the EBCU under test and simultaneously sends an open - circuit test instruction for the solenoid valve to the EBCU under test through the communication CAN bus. The EBCU under test receives the open - circuit test instruction for the solenoid valve, outputs a corresponding seventh output voltage to the test system, and returns the fifth self - check information to the test system through the CAN bus. The seventh output voltage is transmitted to the signal acquisition module 103 after being step - down conditioned by the attenuation module. The signal processing module 104 of the test system analyzes whether the acquired seventh output voltage and the received fifth self - check information are correct and outputs a test result.

[0166] In some embodiments, the detection signal includes a normal test instruction for the solenoid valve, and the feedback signal includes frequency information, an eighth output voltage, duty - cycle information, and a sixth self - check information. When the second switch is closed and the first switch is disconnected, the signal conditioning module 102 is further configured to receive the frequency information, the eighth output voltage, and the duty - cycle information generated after the EBCU under test receives the detection signal, perform a step - down process on the frequency information, the eighth output voltage, and the duty - cycle information, and send them out.

[0167] The signal acquisition module 103 is further configured to acquire the frequency information, the eighth output voltage, and the duty - cycle information after the step - down process at this time.

[0168] The signal processing module 104 is further configured to receive the sixth self-check information, the collected frequency information after step-down processing at this time, the eighth output voltage, and the duty cycle information, determine whether the sixth self-check information, the frequency information after step-down processing at this time, the eighth output voltage, and the duty cycle information are all within the sixth judgment threshold, and output a test result.

[0169] In the normal test of the solenoid valve in the multi-signal coupling test, the second switch on the fault simulation circuit of the signal output module 101 is closed and the first switch is opened. At this time, a solenoid valve normal test instruction is input to the EBCU under test. After receiving the instruction, the EBCU under test generates frequency information, the eighth output voltage, duty cycle information, and the sixth self-check information. The signal conditioning module 102 performs step-down processing on the frequency information, the eighth output voltage, and the duty cycle information. The signal acquisition module 103 acquires the frequency information, the eighth output voltage, and the duty cycle information after step-down processing. The signal processing module 104 receives the sixth self-check information, the frequency information after step-down processing, the eighth output voltage, and the duty cycle information, compares them with the sixth judgment threshold, and thus outputs a test result.

[0170] The system has developed a comprehensive test process for the normal test of the solenoid valve in the multi-signal coupling test. By collecting and analyzing various feedback signals, it accurately evaluates the performance of the EBCU under test in the normal working state of the solenoid valve, ensuring the comprehensiveness of the detection of the normal working state of the solenoid valve in the multi-signal coupling test.

[0171] The test schematic diagram of the POP signal is as Figure 9 shown.

[0172] When performing the normal test of the solenoid valve, S1 is disconnected and S2 is closed.

[0173] During the normal test process, the test system supplies power to the EBCU under test. The test system controls S1 to be disconnected and S2 to be closed. The test system supplies power to the EBCU under test and simultaneously sends a solenoid valve normal test instruction to the EBCU under test through the communication CAN bus. After receiving the solenoid valve normal test instruction, the EBCU under test outputs the corresponding frequency information, the eighth output voltage, and the duty cycle information to the test system, and returns the sixth self-check information to the test system through the CAN bus. The voltage signal is transmitted to the digital signal acquisition module 103 and the analog signal acquisition module 103 in the signal acquisition module 103 after step-down conditioning. The frequency and duty cycle signals are transmitted to the timer / counter module after step-down conditioning. The signal processing module 104 in the test system analyzes whether the collected frequency information, the eighth output voltage, the duty cycle information, and the received sixth self-check information are correct, and outputs a test result.

[0174] Multiple self-check information can be set according to the test requirements. Multiple self-check information is data detected by the CPU of the EBCU under test during their respective test processes.

[0175] In some of these embodiments, it further includes:

[0176] A power supply module, which is respectively connected to the signal output module 101, the electronic brake control unit 105 to be tested, the signal conditioning module 102, the signal acquisition module 103 and the signal processing module 104, and is configured to supply power to the signal output module 101, the electronic brake control unit 105 to be tested, the signal conditioning module 102, the signal acquisition module 103 and the signal processing module 104 respectively.

[0177] The power supply module is respectively connected to the signal output module 101, the EBCU to be tested, the signal conditioning module 102, the signal acquisition module 103 and the signal processing module 104, providing a stable power supply for these modules to ensure that each module can work properly.

[0178] Through a dedicated power supply module, the stable operation of each module of the test system is guaranteed, avoiding inaccurate test results or interruption of the test process due to power supply problems, and improving the stability and reliability of the test system.

[0179] The power supply module includes a programmable power supply, a power supply box and a high-power power supply.

[0180] The programmable power supply includes an SC programmable power supply and an EBCU programmable power supply. Among them, the SC programmable power supply is mainly used to supply power to the signal under test, which is processed by the signal conditioning module 102 and then sent to the signal under test. The EBCU programmable power supply is mainly used to supply power to the EBCU to be tested during the test process.

[0181] The power supply box is mainly used to provide 110V or 24V power for the EBCU to be tested and supply power to the signal conditioning module 102. Three 24V output interfaces and three 110V output interfaces are respectively set on the front panel outside the power supply box.

[0182] The high-power power supply is used for power board impact testing.

[0183] This system adopts a modular power supply design, and a programmable power supply distribution unit is configured in the power supply module to realize independent power supply control for multiple modules. Power supply lines are set between multiple modules and the power supply module, and multiple power supply lines are separately regulated in an electrically isolated state, effectively ensuring that the power supply systems between different detection units are completely decoupled, thus avoiding signal crosstalk problems caused by power supply interference during the detection process and improving the overall reliability and test accuracy of the system.

[0184] In some of these embodiments, the electronic brake control unit 105 to be tested includes a power board, and this test system further includes:

[0185] The power supply test module is connected to the power supply board and is configured to load a preset voltage to the power supply board, detect the power supply output, impact current or output ripple, and output the test result according to the power supply output, impact current or output ripple.

[0186] The power supply test module is connected to the power supply board of the EBCU to be tested, loads a preset voltage to it, detects the power supply output, impact current or output ripple, and outputs the test results according to the detection results to evaluate the performance of the power supply board. Adding a power supply test module can perform special tests on the power supply board of the EBCU to be tested, comprehensively evaluate the power supply performance of the EBCU to be tested, ensure the stability and reliability of the power supply part of the EBCU to be tested during normal operation, and provide more comprehensive data support for the overall performance test of the EBCU to be tested.

[0187] The test system can complete the power board load test, power board impact test and power board ripple test according to the needs.

[0188] The test system also includes a load box and an oscilloscope. The load box is used to perform, including but not limited to, a power board load test. The oscilloscope is used to perform, including but not limited to, a power board ripple test.

[0189] During the power board load test, the test system applies a specified voltage to the power board, and loads with different resistance values ​​are placed on the output end to test the output of the power supply. The resistance value of the load can be selected according to the test needs.

[0190] During the power board impact test, the test system loads the first preset voltage to the power board, closes the switch after power-on, connects the EBCU to be tested, and tests the impact current within 1ms.

[0191] During the power board ripple test, the test system applies a second preset voltage to the power board to test the ripple at the output end.

[0192] The first preset voltage and the second preset voltage can be adjusted according to test requirements.

[0193] In some embodiments, it also includes:

[0194] The adapter module has one end connected to the signal conditioning module 102 and the other end connected to the electronic brake control unit 105 to be tested, and includes multiple types of connector interfaces, and is configured to open the corresponding type of connector interface according to the type of the detection signal, and transmit information to the electronic brake control unit 105 to be tested. According to the output voltage, output current, feedback signal and self-test information generated by the electronic brake control unit 105 to be tested, the corresponding type of connector interface is opened to transmit information to the signal conditioning module 102.

[0195] One end of the adapter module is connected to the signal conditioning module 102, and the other end is connected to the EBCU to be tested, which includes multiple types of connector interfaces. During the test process, the adapter module opens the corresponding type of connector interface according to the type of the detection signal, and accurately transmits the detection signal to the EBCU to be tested. At the same time, according to the output voltage, output current, feedback signal and self-test information generated by the EBCU to be tested, the corresponding type of connector interface is opened, and this information is accurately transmitted to the signal conditioning module 102.

[0196] The present application constructs a standardized signal transfer path through a transfer module, which significantly improves the test efficiency and equipment compatibility. The transfer module can be configured to use an industrial-grade connector interface of uniform specifications to standardize and integrate the input / output signals of the signal conditioning module 102, thereby realizing the plug-and-play function of the test adapter. This modular design allows different EBCUs to be tested to complete the test switching by simply replacing the corresponding adapter, eliminating the work link of frequent manual wiring operations in traditional testing, and improving the versatility and convenience of the test system.

[0197] The adapter module uniformly transfers the input and output of the signal conditioning module 102 to the standard connector interface. The adapter module is also connected to the adapter of the EBCU to be tested through multiple dedicated cables, and the interface can be expanded.

[0198] The test system can be integrated into a test cabinet, which is equipped with, but not limited to, a bus test bench, a conditioning box, a power supply module, and input / output devices. The EBCU to be tested can be placed in the test cabinet. The test system is provided with an adapter connector. The test cabinet and the test system are electrically connected via an adapter cable.

[0199] It should be noted that the above modules can be functional modules or program modules, and can be implemented by software or hardware. For modules implemented by hardware, the above modules can be located in the same processor; or the above modules can be located in different processors in any combination.

[0200] The present application also provides an electronic brake control unit signal test platform. The test platform framework is based on the LabVIEW graphical development environment and adopts a modular design to reduce code coupling and facilitate modification and debugging. The structure of the test platform is as follows: Figure 10As shown in the figure, the test platform includes, but is not limited to, a hardware management module, a test module, a user interaction module, a communication module, a user management module, a setting module, a data playback module, a database, and a log module. Each module is independent and obtains the data it needs from the shared resource memory. Among them, the hardware management module includes, but is not limited to, a data acquisition module, a hardware control module, and a data storage module. The test platform simplifies the data acquisition and hardware control processes by constructing virtual channels for hardware management, and users can implement the control process through the user interaction module.

[0201] The log module is used to record the user test instruction sending records and the errors generated by the software platform operations.

[0202] The database is used to store data and perform database management.

[0203] In the user management module, the administrator has full permissions, and the operator has restricted permissions.

[0204] The setting module is used to perform various settings of the test platform.

[0205] The data playback module is used to analyze the saved data.

[0206] The hardware management module is used for data acquisition, hardware control, and data storage.

[0207] The test module is used for process editing, process execution, and generating test reports.

[0208] A user interface is set in the user interaction module. In the user interface, the user operates through the mouse to interact with the test module and execute the process.

[0209] The communication module is used to connect to the network port test instrument.

[0210] The test platform also includes multiple test channels and a channel management module, which are used to manage the virtual channels used for data acquisition and hardware control, and modify the channel values of the test channels used when the user performs mouse operations.

[0211] To reduce the difficulty of hardware control, the test platform performs secondary encapsulation on the hardware driver, virtualizes common hardware into a group of software channels, and realizes hardware control by reading or writing to the channels. The channels include the channels after the hardware is virtualized and the test channels, and are the bridge for data interaction of the entire test platform. For example, multiple channels are set for a certain type of power supply, including voltage channel, set protection current channel, current voltage channel, current current channel, and power enable channel. When the power supply needs to output 5V voltage during the test, only write 5V to the set voltage channel and write True to the power enable channel to control the power supply, and read the current voltage channel to obtain the actual value of the current voltage. In this way, the configuration software can be flexibly configured according to personalized test requirements, improving programming efficiency and reducing the error rate. Virtualizing the hardware into channels can avoid the influence of driver differences from different manufacturers, reduce the difficulty of hardware management, and facilitate the construction of hardware control and hardware data acquisition modules in automatic process testing based on channel management. It has good scalability and can be secondarily developed based on existing functions. It includes multiple communication interfaces of LabVIEW and can meet the communication requirements between buses in different development environments.

[0212] As Figure 11 shown, the channel control structure diagram of the test platform includes a host computer, a slave computer, an analog acquisition card, a CAN card, and a digital acquisition card. The host computer includes an industrial computer. The slave computer includes a PXI chassis. The host computer is used for human-computer interaction, and multiple controls are set on the display interface of the host computer for configuring channels. The slave computer is used to turn on or off the input channels and output channels inside the analog acquisition card, CAN card, and digital acquisition card according to the instructions of the host computer and hardware requirements to complete data transfer. The data transfer of the test platform includes but is not limited to data collected by hardware channels, host computer data, slave computer data, and data transmitted between modules.

[0213] This embodiment also provides a method for testing the signal of an electronic brake control unit. As Figure 12As shown, the dashed box in the flowchart of the test method represents the single-signal test process method taking the ASI signal as an example. When selecting multiple signals of the test module or the whole machine according to the test requirements, the module test or the whole-machine test can be selected on the human-machine interaction interface, the signals to be tested are selected, the module test configuration is completed, and the module to be tested is selected to complete the whole-machine test configuration. After completing the selection of the test item points, the test starts. First, the control virtual hardware is executed to power on the EBCU under test, and the power is supplied to the EBCU under test through the hardware control shared data pool. Secondly, the control virtual hardware ASI output current is executed, and the test power supply is provided to the EBCU under test through the hardware control shared data pool. Secondly, the CAN instruction is sent to the EBCU under test through the hardware control shared data pool. After receiving the instruction, the EBCU under test feeds back the CAN response to the test system through the hardware control shared data pool. The test system reads back the CAN response, analyzes and judges the CAN frame in the CAN response. The EBCU under test sends the output signal to the test system through the hardware control shared data pool. The test system samples the output signal of the EBCU under test and judges whether it is correct, saves the test result, and judges whether to start the test of the next channel. If so, the test of the next item point is started until all item points are tested, the report is printed, and the current test is completed. Judge whether to continue the test. If so, interact with the user to obtain a new test instruction. If not, disconnect the power supply of the EBCU under test and end the signal test of the EBCU under test.

[0214] As Figure 13 shown, the usage process of the test system includes that after the tester first powers on the test system, then places the EBCU under test and connects the corresponding cables, opens the test platform, and can select the whole machine, module or signal type to be tested through the human-machine interaction interface. Click the start button on the front-end interface, and the test platform will supply power to the EBCU under test and start the test. During the test execution, each module is called through the background control program to realize the automatic execution of the entire test process. During the test, the interface real-time displays the test results of each test item point and the data frames on the CAN bus. The test process can be controlled through the pause / continue button, and the current test can be terminated through the stop button. After the test is completed, the DUT will be powered off automatically, and the test records will be saved locally.

[0215] The front-end interface can real-time display the test item points, test progress and running status. If an abnormality occurs during the test, the system will alarm through the warning light and buzzer. After the test is completed, the test platform automatically analyzes the test results, generates a test report, and the technical personnel can quickly locate the fault points of the EBCU board according to the test report.

[0216] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0217] The above-described embodiments merely represent several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. An electronic brake control unit signal test system, characterized in that The described test system is used to detect whether the signals of the electronic brake control unit to be tested are normal, and includes: A signal output module, connected to the electronic brake control unit to be tested, and configured to input various types of detection signals to the electronic brake control unit to be tested; A signal conditioning module, connected to the signal output module and the electronic brake control unit to be tested respectively, and configured to receive the detection signals, perform signal conditioning processing on the detection signals, send the processed detection signals to the electronic brake control unit to be tested, and receive the feedback signals generated by the electronic brake control unit to be tested after obtaining the detection signals, and perform signal conditioning processing on the feedback signals and send them out; A signal acquisition module, connected to the signal conditioning module and the electronic brake control unit to be tested, and configured to acquire the feedback signals and the feedback signals after signal conditioning processing; A signal processing module, connected to the electronic brake control unit to be tested and the signal acquisition module respectively, and configured to receive the feedback signals and the feedback signals after signal conditioning processing, compare the feedback signals and the feedback signals after signal conditioning processing with at least one type of judgment data, and output the test result.

2. The electronic brake control unit signal testing system according to claim 1, wherein The detection signals include high-level signals, and the feedback signals include relay output signals, relay states, first output voltages, and first self-check information. During the digital quantity signal test process, the signal output module is further configured to input high-level signals to the electronic brake control unit to be tested; The signal conditioning module is further configured to receive the relay output signals generated by the electronic brake control unit to be tested after obtaining the high-level signals, perform step-down processing on the relay output signals and send them out; The signal acquisition module is further configured to acquire the relay states and the first output voltages of the electronic brake control unit to be tested; The signal processing module is further configured to receive the relay states, the first output voltages, and the relay output signals after step-down processing, judge whether the first self-check information, the relay states, the first output voltages, and the relay output signals after step-down processing are all within the first judgment data threshold, and output the test result.

3. The electronic brake control unit signal test system according to claim 1, wherein The detection signals include first analog output signals, and the feedback signals include second self-check information, second output voltages, and / or first output currents. During the analog quantity signal test process, the signal output module is further configured to input the first analog output signals to the electronic brake control unit to be tested; The signal conditioning module is further configured to, in the case that the first output current is generated by the electronic brake control unit to be tested after obtaining the first analog output signals, receive the first output current and convert the first output current into a corresponding third output voltage; The signal acquisition module is further configured to acquire the third output voltage or the second output voltage generated by the electronic brake control unit to be tested after receiving the first analog output signals; The signal processing module is further configured to receive the second output voltage or the third output voltage, and the second self-check information, judge whether the second output voltage or the third output voltage and the second self-check information are all within the second judgment data threshold, and output the test result.

4. The electronic brake control unit signal test system according to claim 1, wherein The detection signal includes a second analog output signal, and the feedback signal includes a third self-checking message, a fourth output voltage, and / or a second output current. During the frequency signal test process, the signal output module is further configured to input an adjustable second analog output signal to the electronic brake control unit under test. The second analog output signal includes a voltage pulse signal and a current pulse signal. The signal conditioning module is further configured to receive the second output current in the case where the second output current is generated after the electronic brake control unit under test receives the second analog output signal, and convert the second output current into a corresponding fifth output voltage. The signal acquisition module is further configured to acquire the fifth output voltage or the fourth output voltage generated after the electronic brake control unit under test receives the second analog output signal. The signal processing module is further configured to receive the fourth output voltage or the fifth output voltage, and the third self-checking message, and determine whether both the fourth output voltage or the fifth output voltage and the third self-checking message are within the third judgment data threshold, and output a test result.

5. The electronic brake control unit signal testing system according to claim 1, characterized in that During the multi-signal coupling test process, the signal output module includes a fault simulation circuit, and a first switch and a second switch are arranged on the fault simulation circuit. In the case where the first switch is closed and the second switch is closed, the detection signal includes a solenoid valve short-circuit test instruction, and the feedback signal includes a sixth output voltage and a fourth self-checking message. The signal conditioning module is further configured to receive the sixth output voltage generated after the electronic brake control unit under test receives the detection signal, step down the sixth output voltage and send it out. The signal acquisition module is further configured to acquire the sixth output voltage after step-down at this time. The signal processing module is further configured to receive the fourth self-checking message and the sixth output voltage after step-down acquired at this time, determine whether both the fourth self-checking message and the sixth output voltage after step-down at this time are within the fourth judgment data threshold, and output a test result.

6. The electronic brake control unit signal testing system according to claim 5, wherein The detection signal includes a solenoid valve open-circuit test instruction, and the feedback signal includes a seventh output voltage and a fifth self-checking message. In the case where the first switch is open or closed and the second switch is open, the signal conditioning module is further configured to receive the seventh output voltage generated after the electronic brake control unit under test receives the detection signal, step down the seventh output voltage and send it out. The signal acquisition module is further configured to acquire the seventh output voltage after step-down at this time. The signal processing module is further configured to receive the fifth self-checking message and the seventh output voltage after step-down acquired at this time, determine whether both the fifth self-checking message and the seventh output voltage after step-down at this time are within the fifth judgment threshold, and output a test result.

7. The electronic brake control unit signal testing system according to claim 5, characterized in that, The detection signal includes a normal test instruction of the solenoid valve, and the feedback signal includes frequency information, an eighth output voltage, duty cycle information and sixth self-test information. When the second switch is closed and the first switch is open, the signal conditioning module is further configured to receive the frequency information, the eighth output voltage and the duty cycle information generated after the electronic brake control unit to be tested receives the detection signal, and perform voltage reduction processing on the frequency information, the eighth output voltage and the duty cycle information and send them out; The signal acquisition module is further configured to collect frequency information, the eighth output voltage and duty cycle information after the voltage reduction process; The signal processing module is further configured to receive the sixth self-test information, the collected frequency information after the voltage reduction processing, the eighth output voltage and the duty cycle information, determine whether the sixth self-test information, the frequency information after the voltage reduction processing, the eighth output voltage and the duty cycle information are all within the sixth judgment threshold, and output the test results.

8. The electronic brake control unit signal test system according to any one of claims 1-7, characterized in that Also includes: The power supply module is respectively connected to the signal output module, the electronic brake control unit to be tested, the signal conditioning module, the signal acquisition module and the signal processing module, and is configured to supply power to the signal output module, the electronic brake control unit to be tested, the signal conditioning module, the signal acquisition module and the signal processing module respectively, and the power supply lines corresponding to the signal output module, the electronic brake control unit to be tested, the signal conditioning module, the signal acquisition module and the signal processing module are independently regulated under electrical isolation.

9. The electronic brake control unit signal testing system according to claim 8, wherein The electronic brake control unit to be tested includes a power supply board, and the test system also includes: The power supply test module is connected to the power supply board and is configured to load a preset voltage to the power supply board, detect the power supply output, impact current or output ripple, and output the test result according to the power supply output, impact current or output ripple.

10. The electronic brake control unit signal testing system according to any one of claims 1-7, characterized in that, Also includes: The adapter module has one end connected to the signal conditioning module and the other end connected to the electronic brake control unit to be tested, including multiple types of connector interfaces, and is configured to open the corresponding type of connector interface according to the type of detection signal to transmit information to the electronic brake control unit to be tested; according to the output voltage, output current, feedback signal and self-test information generated by the electronic brake control unit to be tested, open the corresponding type of connector interface to transmit information to the signal conditioning module.

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