A fault simulation test method and device of a parking brake motor, an electronic device, and a storage medium

Abstract

The application discloses a kind of parking brake motor fault simulation test method, device, electronic equipment and storage medium, belong to motor fault test technical field.The method comprises: after receiving the test instruction of brake motor to be measured, can be based on the control process of switching circuit, automatically connect fault simulation brake motor into the working loop of brake motor to be measured, to build motor abnormal connection working condition;After abnormal condition is established, circuit operating parameter, the rotational speed data of two motors and the action state data of actuator are synchronously collected, and finally based on all the acquisition information automatically generates the fault test result of brake motor to be measured.The application adopts the mode that switching circuit automatically accesses external motor, saves the link of manual line change and repeatedly disassembles, and does not change the wiring harness and connector of original vehicle throughout the process, can improve the overall efficiency of test operation, effectively protects the hardware structure of original vehicle, and gives consideration to test efficiency and equipment use safety.

Description

Technical Field

[0001] This application relates to the field of motor fault testing technology, and in particular to a fault simulation testing method, device, electronic equipment and storage medium for a parking brake motor. Background Technology

[0002] In existing technologies, to simulate and test the performance of abnormal connection faults of parking brake motors, such as EPB motors, it is usually necessary to manually build abnormal connection circuits of the motor and complete data acquisition and result analysis in order to reproduce the actual vehicle motor connection faults and thus accurately determine the fault characteristics of the motor.

[0003] However, traditional technologies for simulating abnormal connection faults in wheel-side integrated parking brake motors generally employ a manual jump-connection method to the original vehicle wiring harness. This involves physically modifying the original wiring harnesses and connectors of the two original wheel-side EPB motors on the vehicle or test bench. This requires manually breaking two independent original circuits and then forcibly connecting the two original motors using external wires to simulate abnormal interconnection faults caused by wiring misconnections or repair errors in the actual vehicle. Switching between different fault scenarios requires performing the entire process of disconnection, jump-connection, testing, and restoration. Since traditional technologies rely entirely on manual disassembly and jump-connection of the original vehicle wiring harness to construct fault conditions, the entire operation is cumbersome, and switching between different fault scenarios is time-consuming, resulting in low overall testing efficiency. Moreover, repeated disassembly and reassembly of motor connectors and bending of the original vehicle wiring harness can easily damage the original parking brake motor and the vehicle's wiring, leading to a high risk of equipment wear and tear and making it unsuitable for the practical application requirements of batch testing of parking brake motors. Summary of the Invention

[0004] The main purpose of this application is to propose a fault simulation test method, device, electronic equipment and storage medium for parking brake motors. By adopting a mode of automatic connection of external motors through switching circuits, the overall efficiency of the test operation is improved, the original vehicle hardware structure is effectively protected, and the test efficiency and equipment safety are balanced.

[0005] To achieve the above objectives, one aspect of this application proposes a fault simulation test method for a parking brake motor, the method comprising: When a test command is received for the brake motor under test, a fault simulation brake motor is connected to the working circuit of the brake motor under test by switching circuit control, so that the working circuit forms an abnormal motor connection condition. When an abnormal connection condition of the motor is detected, the circuit operating parameters, the first speed corresponding to the brake motor under test, the second speed corresponding to the fault simulation brake motor, and the action status data of the actuator corresponding to the brake motor under test are collected. Based on the circuit operating parameters, the first speed, the second speed, and the actuator action status data, the fault test results of the brake motor under test under abnormal motor connection conditions are generated.

[0006] Furthermore, in some embodiments, the electrical parameters and mechanical dynamic parameters between the fault simulation brake motor and the brake motor under test are the same; The step of controlling the fault simulation brake motor to be connected to the working circuit of the brake motor under test by switching circuits includes: By controlling the switching circuit, the fault simulation brake motor and the brake motor under test can be connected in a forward series connection, a reverse series connection, or a symmetrical parallel connection.

[0007] Furthermore, in some embodiments, the electrical and mechanical parameters between the fault simulation brake motor and the brake motor under test are different; The step of controlling the fault simulation brake motor to be connected to the working circuit of the brake motor under test by switching circuits includes: By controlling the switching circuit, the fault simulation brake motor and the brake motor under test are connected in an asymmetrical parallel connection.

[0008] Furthermore, in some embodiments, the switching circuit is a relay switching circuit; The step of connecting the fault simulation brake motor and the brake motor under test in a forward series connection, a reverse series connection, or a symmetrical parallel connection via a control switching circuit includes: By controlling the on / off state of the relays inside the relay switching circuit, the fault simulation brake motor and the brake motor under test can be connected in a forward series connection, a reverse series connection, or a symmetrical parallel connection.

[0009] Furthermore, in some embodiments, the step of controlling the switching circuit to form a forward series connection, a reverse series connection, or a symmetrical parallel connection between the fault simulation brake motor and the brake motor under test includes: If the test command is a positive series fault simulation command, the negative terminal of the brake motor under test is connected to the positive terminal of the fault simulation brake motor by controlling the switching circuit, so that the two motors are connected in series in the working circuit with the same power supply polarity to form a positive series connection. If the test command is a reverse series fault simulation command, the negative terminal of the brake motor under test is connected to the negative terminal of the fault simulation brake motor by controlling the switching circuit, so that the two motors are connected in series in the working circuit with opposite power supply polarities to form a reverse series connection. If the test command is a symmetrical parallel fault simulation command, the positive terminals of the fault simulation brake motor and the brake motor under test are connected to each other and the negative terminals are connected to each other through the control switching circuit to form a symmetrical parallel connection.

[0010] Furthermore, in some embodiments, the step of controlling the switching circuit to form an asymmetrical parallel connection between the fault simulation brake motor and the brake motor under test includes: By controlling the switching circuit, the positive terminals of the fault simulation brake motor and the brake motor under test are connected to each other, and their negative terminals are connected to each other, forming an asymmetrical parallel connection.

[0011] Furthermore, in some embodiments, after an abnormal motor connection condition is formed, the method further includes: The loop current and motor temperature of the working circuit are collected; wherein, the motor temperature is: the temperature corresponding to the brake motor under test, or the temperature corresponding to the fault simulation brake motor; If the circuit current is greater than a preset current threshold or the motor temperature is greater than a preset temperature threshold, disconnect the fault simulation brake motor from the brake motor under test.

[0012] To achieve the above objectives, another aspect of this application proposes a fault simulation testing device for a parking brake motor, the device comprising: The motor connection control module is used to control the fault simulation brake motor to be connected to the working circuit of the brake motor under test by switching circuits when a test command is received from the brake motor under test, so that the working circuit forms an abnormal motor connection condition. The data acquisition module is used to acquire circuit operating parameters, the first speed corresponding to the brake motor under test, the second speed corresponding to the fault simulation brake motor, and the action status data of the actuator corresponding to the brake motor under test when an abnormal connection condition of the motor is detected. The fault test result generation module is used to generate the fault test result of the brake motor under test under abnormal motor connection conditions based on the circuit operating parameters, the first speed, the second speed, and the actuator action status data.

[0013] To achieve the above objectives, another aspect of this application provides an electronic device, which includes a memory and a processor. The memory stores a computer program, and the processor executes the computer program to implement the aforementioned method for simulating the fault of a parking brake motor.

[0014] To achieve the above objectives, another aspect of the embodiments of this application proposes a computer-readable storage medium storing a computer program that, when executed by a processor, implements the aforementioned method for simulating a parking brake motor fault.

[0015] The embodiments of this application include at least the following beneficial effects: This application provides a method, device, electronic device, and storage medium for simulating the fault of a parking brake motor. Upon receiving a test command from the brake motor under test, this solution can automatically connect the fault-simulating brake motor to the working circuit of the brake motor under test based on the control process of the switching circuit, thereby constructing an abnormal connection condition for the motor. After the abnormal condition is established, the circuit operating parameters, the speed data of the two motors, and the action status data of the actuator are collected synchronously. Finally, based on all the collected information, the fault test result of the brake motor under test is automatically generated. The process of this application can automatically complete the construction of the working condition, data collection, and result output based on an external fault-simulating brake motor, without requiring human intervention in the original vehicle wiring. Compared with traditional technologies, this application adopts an automated switching circuit connection mode for external motors, eliminating the need for manual wiring modifications and repeated disassembly and reassembly, thereby improving the overall efficiency of the testing operation. Since no physical modifications are made to the original vehicle wiring harness and connectors throughout the process, the risk of damage to the original vehicle motor and its supporting wiring due to human disassembly and reassembly is avoided, significantly reducing the probability of equipment damage. Therefore, this application can simplify the on-site operation to improve the overall efficiency of the test operation, effectively protect the original vehicle hardware structure, take into account the test accuracy and equipment safety, and fully meet the actual work requirements of parking brake motor abnormal connection fault simulation and batch testing. Attached Figure Description

[0016] Figure 1 This is a flowchart illustrating a fault simulation test method for a parking brake motor provided in an embodiment of this application. Figure 2 This is a connection diagram of the relay switching circuit provided in the embodiment of this application; Figure 3 This is a schematic diagram of the structure of a fault simulation test device for a parking brake motor provided in an embodiment of this application; Figure 4 This is a schematic diagram of the hardware structure of the electronic device provided in the embodiments of this application. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit it. In the following description, when referring to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with those of this application; they are merely examples of apparatuses and methods consistent with some aspects of the embodiments of this application as detailed in the appended claims.

[0018] It is understood that the terms “first,” “second,” etc., used in this application may be used herein to describe various concepts, but unless otherwise stated, these concepts are not limited by these terms. These terms are only used to distinguish one concept from another. For example, without departing from the scope of the embodiments of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the words “if,” “when,” or “in response to a determination” as used herein may be interpreted as “when…” or “when…” or “in response to a determination.”

[0019] As used in this application, the terms "several", "each", etc., "several" include one, two or more, "each" refers to each of the corresponding plurality, and "any" refers to any one of the plurality.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit this application.

[0021] Before providing a detailed description of the embodiments of this application, some of the nouns and terms involved in the embodiments of this application will be explained first. The nouns and terms involved in the embodiments of this application are subject to the following interpretations.

[0022] (1) EPB (Electronic Parking Brake) is an electronic parking brake system. The EPB motor actually refers to the electronic parking brake motor, which is the dedicated power execution motor of the EPB system and the core execution component of the entire electronic parking system.

[0023] It can replace the manual pulling force of traditional mechanical handbrakes, converting on-board electrical energy into mechanical torque, and driving braking components through electrical circuits and transmission mechanisms to achieve wheel parking clamping and parking release. It is applicable to passenger cars and some commercial vehicles.

[0024] At present, the simulation test of abnormal parking brake motor faults generally adopts the operation mode of manually bridging the original vehicle wiring harness. That is, the wiring harness plug and protective shell of the original EPB motor of the vehicle are manually removed, and the power supply terminals of the two original motors are manually bridging with external wires to artificially create different fault conditions. After the test is completed, the wiring is manually disconnected and restored.

[0025] The traditional manual testing method described above requires manual disassembly and assembly as well as cross-connection of wiring harnesses, which is cumbersome. Switching between different fault scenarios requires repeated disconnection, reconnection, and restoration, resulting in long testing time and low overall efficiency, making it unsuitable for the needs of batch motor testing. At the same time, repeated disassembly and assembly of original vehicle connectors and bending of native wiring harnesses can easily cause loose terminals, damaged wiring harnesses, or oxidation of the lines, which can damage the original motor and the vehicle's wiring, resulting in high hardware wear and tear costs.

[0026] In view of this, this application provides a method, device, electronic device and storage medium for simulating the fault of a parking brake motor. This solution can automatically connect an external fault simulation brake motor through an independent switching circuit. It constructs an abnormal connection condition of the motor without disassembling the original vehicle wiring and simultaneously collects multi-dimensional operating data to generate fault test results. This can effectively solve the technical problems of low efficiency and easy damage of traditional manual testing, and improve the efficiency and stability of parking brake motor fault simulation testing.

[0027] Figure 1 This is an optional flowchart of a fault simulation test method for a parking brake motor provided in an embodiment of this application. Figure 1 The method may include, but is not limited to, steps S1 to S3: Step S1: Upon receiving a test command for the brake motor under test, the fault simulation brake motor is connected to the working circuit of the brake motor under test by switching the circuit, so that the working circuit forms an abnormal motor connection condition. Indicatively, this application can respond to various fault test commands issued by the host computer based on a preset automatic switching circuit. It does not require disassembling or modifying the original vehicle wiring harness and installation structure of the brake motor under test. It can quickly connect the external fault simulation brake motor to the original working circuit of the motor under test by simply controlling the circuit on and off, thereby quickly constructing abnormal motor connection conditions to simulate various fault scenarios caused by wiring errors or incorrect parts installation in real vehicles.

[0028] Step S2: When the abnormal connection condition of the motor is detected, the circuit operating parameters, the first speed corresponding to the brake motor under test, the second speed corresponding to the fault simulation brake motor, and the action status data of the actuator corresponding to the brake motor under test are collected. Indicatively, once the abnormal connection between the two motors is stably established and the circuit operation status is stable, this application can immediately activate the full-dimensional synchronous data acquisition mechanism. It can collect circuit operation parameters such as voltage, current, and impedance of the working circuit in real time. It can also collect the real-time speed of the brake motor under test, i.e., the first speed, and the real-time speed of the fault simulation brake motor, i.e., the second speed. At the same time, it can simultaneously capture the action status of actuators such as brake calipers and parking cables to collect electrical operation data, motor motion data, and mechanical execution data under abnormal conditions.

[0029] Step S3: Based on the circuit operating parameters, the first speed, the second speed, and the actuator action status data, generate the fault test results of the brake motor under test under abnormal motor connection conditions.

[0030] Indicatively, this application integrates and analyzes multi-dimensional data collected simultaneously. By combining the parameter thresholds and fault characteristics under abnormal connection conditions of the motor, the fault type, fault degree, and operational defects of the motor under test can be determined, and finally traceable fault test results can be generated to complete automated fault simulation and detection.

[0031] For example, in an optional application scenario, the present invention can perform fault testing on the original EPB motor under test of the rear wheel of a passenger vehicle. After the host computer issues the fault test command, it can control the switching circuit to automatically connect the fault simulation motor and construct an abnormal parallel working condition of the motor. After the working condition stabilizes, the present invention synchronously collects the overload current of the circuit, the low speed of the motor under test, the high speed of the simulation motor, and the state data of the braking mechanism clamping lag. Finally, after comprehensive analysis, it is determined that the motor under test has an overload operation defect under the working condition, and thus outputs the corresponding fault test report.

[0032] Steps S1 to S3 as illustrated in this application embodiment automatically establish fault conditions through automated circuit switching, replacing the traditional manual wiring harness disconnection and reconnection operation mode. This avoids damage to the original vehicle motor, wiring harness, and connectors caused by repeated disassembly and reassembly, improving test safety. Moreover, it can simultaneously collect multi-dimensional data such as circuit electrical parameters, the speed of the two motors, and the action status of the actuator. The data coverage is comprehensive, and it can completely restore the comprehensive fault performance after abnormal motor connection, making the test results more valuable. This application realizes full automation of the process of command reception, condition setup, data acquisition, and result generation, greatly simplifying manual operation and improving overall test efficiency. It can be adapted to scenarios such as batch production testing of EPB motors and laboratory reliability testing.

[0033] Regarding step S1, in some embodiments, the present invention can select a fault simulation motor based on the same parameters to specifically reproduce the fault scenario of misconnection of motors of the same specification in a real vehicle, thus: The electrical and mechanical parameters of the fault simulation brake motor and the brake motor under test are the same. The specific process of connecting the fault simulation brake motor to the working circuit of the brake motor under test by switching the circuit includes: By controlling the switching circuit, the fault simulation brake motor and the brake motor under test can be connected in a forward series connection, a reverse series connection, or a symmetrical parallel connection.

[0034] It is understood that the embodiments of the present invention can select a fault simulation brake motor whose electrical parameters such as rated voltage, rated current and winding impedance, as well as mechanical power parameters such as rated torque, rated speed and transmission ratio of reduction mechanism, are completely matched with the original brake motor under test, so that the load characteristics and operating characteristics of the two motors are consistent, which can equivalently replace the working scenario of the same model of dual motors in the original vehicle.

[0035] Indicatively, based on the matching characteristics of motors with the same parameters, three types of high-frequency real vehicle fault conditions can be flexibly constructed by switching the on and off logic of the switching circuit. For example, the forward series condition where two motors work in the same direction, the reverse series condition where two motors are opposite each other, and the symmetrical parallel condition where two motors output power synchronously. Thus, various abnormal fault conditions caused by wiring errors of motors of the same model can be reproduced.

[0036] For example, in an optional implementation scenario, the present invention selects a simulated motor with parameters completely identical to the original EPB motor under test. By switching the circuit to construct a forward series condition, it simulates the series fault of the two motors caused by the wiring connection in the real vehicle, thereby reproducing the fault phenomena of reduced circuit current, insufficient motor output torque, and insufficient parking clamping force. If a reverse series condition is constructed by switching the circuit, the faults of the two motors canceling each other out and the mechanism jamming and unable to park can be reproduced. By switching the circuit to construct a symmetrical parallel condition, the fault of the two motors overheating synchronously due to the short circuit can be reproduced.

[0037] Therefore, by using a fully parameter-matched simulated motor, the embodiments of the present invention can restore the electrical and mechanical operating state of abnormal interconnection of motors of the same model in a 1:1 manner, making the equivalence and accuracy of fault simulation higher. Moreover, only one set of hardware equipment is needed to cover the three core fault scenarios of forward series, reverse series and symmetrical parallel connection, effectively reducing the hardware construction cost of the test bench.

[0038] In some embodiments, the present invention can select a simulated motor for non-parameter faults, filling the gap in traditional testing for fault scenarios involving mis-installed motors of different specifications, which cannot be covered by traditional testing. The electrical and mechanical parameters of the fault-simulating brake motor and the brake motor under test are different. The step of controlling the fault simulation brake motor to be connected to the working circuit of the brake motor under test by switching circuits specifically includes: By controlling the switching circuit, the fault simulation brake motor and the brake motor under test are connected in an asymmetrical parallel connection.

[0039] Indicatively, embodiments of the present invention may select a fault simulation brake motor whose core parameters, such as rated power, operating current, output torque, and speed characteristics, are significantly different from the original motor under test, thereby constructing the asymmetrical operating characteristics of the two motors and accurately simulating the fault conditions of EPB motors of different specifications that are incorrectly installed.

[0040] Indicatively, this embodiment of the invention can connect two motors with inconsistent parameters to the working circuit by switching the circuit, forming an asymmetrical parallel fault condition. Under this condition, the load distribution of the two motors is uneven, their operating speeds are asynchronous, and their output is inconsistent, which can closely match the fault performance of a real vehicle after incorrectly installing motors of different specifications.

[0041] For example, in an optional implementation scenario, the original motor under test is a 12V / 80W high-power EPB motor, and the fault simulation motor is a 12V / 50W low-power motor of a different specification. After the two motors are connected in parallel, the low-power motor is overloaded and its speed is abnormal, while the high-power motor has excess output power. This can reproduce the fault conditions caused by the incorrect installation of the motor during vehicle repair, such as asynchronous parking action of the left and right wheels, insufficient braking force on one side, or parking deviation.

[0042] The embodiments of the present invention can fill the testing blind spot of parking brake motor fault simulation by addressing the fault scenario of mis-installed motors of different specifications that cannot be simulated by traditional testing, and realize full-scenario fault verification. Based on the inherent parameter differences of motors, an asymmetric fault condition is constructed without modifying the circuit topology, which complements the fault scenario with the same parameters and improves the full-coverage testing system for abnormal motor connection faults.

[0043] In some embodiments, the present invention may further specify the hardware type of the switching circuit and the principle of operating condition switching, and clarify the hardware implementation method of automated operating condition switching, then: The switching circuit is a relay switching circuit; Therefore, when the fault simulation brake motor and the brake motor under test are connected in a forward series connection, a reverse series connection, or a symmetrical parallel connection through the control switching circuit, the specific steps include: By controlling the on / off state of the relays inside the relay switching circuit, the fault simulation brake motor and the brake motor under test can be connected in a forward series connection, a reverse series connection, or a symmetrical parallel connection.

[0044] Indicatively, embodiments of the present invention can use relays to build a switching circuit; specifically, the present invention can precisely control the on and off combination states of each relay according to different test commands, change the electrical connection topology of two motors, and quickly switch between three fault conditions—forward series, reverse series, and symmetrical parallel—without manual intervention, achieving millisecond-level switching of fault scenarios.

[0045] Optionally, the relay can include general-purpose devices such as series-parallel switching relays, polarity switching relays, and parallel branch relays; specifically, the series-parallel switching relay is equivalent to the main switch of the series circuit. When the series-parallel switching relay is energized, the two motors enter the series operating mode; when the series-parallel switching relay is de-energized, the series circuit is completely disconnected, preventing short circuits caused by simultaneous connection of series and parallel lines.

[0046] The polarity switching relay only works under series operation and is used to switch the positive and negative power supply terminals of the fault simulation motor. It can keep the original wiring as positive series and switch the wiring to reverse series, thereby simulating a fault with incorrect wiring polarity.

[0047] A parallel branch relay acts as a switch for a parallel circuit. When the parallel branch relay is energized, the positive and negative terminals of the two motors are connected, entering parallel operation mode; when the parallel branch relay is de-energized, the parallel circuit is closed.

[0048] The simple coordination logic of the three different relays mentioned above is as follows: when performing a series test in either the forward or reverse direction, the series-parallel switching relay is turned on, the parallel branch relay is turned off, and then the polarity switching relay is used to switch the polarity. When performing symmetrical or asymmetrical parallel tests, the series-parallel switching relay is disconnected, the parallel branch relay is turned on, and the polarity switching relay does not participate in the operation.

[0049] For example, in an optional implementation scenario, when performing a forward series test, the system controls the series-parallel switching relay to turn on while the other relays turn off, thus constructing a series circuit; when switching to a symmetrical parallel test, the series-parallel switching relay is turned off while the parallel branch relay is turned on, thereby quickly switching to a parallel circuit. The entire process is completed automatically without any manual wiring operations.

[0050] In some embodiments, such as Figure 2 As shown, Figure 2This is a schematic diagram of the relay switching circuit provided in the embodiments of this application. First, the meanings of all the reference numerals in the figure are explained: DC is the DC power supply for the entire test circuit; M0 is the brake motor under test; M1 is a fault simulation brake motor with the same electrical and mechanical power parameters as M0; M2 is a fault simulation brake motor with different electrical and mechanical power parameters than M0; K1 is a series-parallel switching relay; K3 is a polarity switching relay; K2 is a parallel branch relay; K4 and K5 are branch selection switches; K4 is used to select the branch where M1 is located, and K5 is used to select the branch where M2 is located. The two have hardware interlocking logic.

[0051] Indicatively, the entire circuit uses a DC power supply as the power source. The brake motor under test, M0, is fixedly connected to the main power supply bus. The two fault simulation brake motors, M1 and M2, selectively connect to the working circuit of M0 by the on / off combinations of various relays and auxiliary switches, thereby realizing the switching of four types of abnormal connection conditions.

[0052] Specifically, for the forward series connection condition, that is, the control and connection principle of M0 and M1 in forward series with the same parameters is as follows: When receiving a simulated positive series fault command, auxiliary switch K4 remains closed and K5 remains open; series-parallel switching relay K1 is turned on, polarity switching relay K3 maintains its original positive contact state, and parallel branch relay K2 is completely open. The circuit current flow is as follows: [DC positive, M0 power supply input terminal (positive), M0 power supply output terminal (negative), K1 and K3 are turned on for forward connection, M1 positive input terminal, M1 negative output terminal, DC negative]; at this time, the negative terminal of M0 is connected to the positive terminal of M1, and the polarities of the two motor power supplies are in the same direction, forming a positive series connection structure.

[0053] For the reverse series connection condition, that is, M0 and M1 are connected in reverse series with the same parameters, the control and connection principle is as follows: When receiving a reverse series fault simulation command, auxiliary switch K4 closes and K5 opens; series-parallel switching relay K1 remains on, polarity switching relay K3 switches its contacts, and parallel branch relay K2 remains off. The circuit current flow is: [DC positive terminal, M0 positive input terminal, M0 negative output terminal, K1 on, reverse path after K3 switching, M1 negative input terminal, M1 positive output terminal, DC negative terminal]; at this time, the negative terminal of M0 is connected to the negative terminal of M1, the polarities of the two motors are opposite, and their outputs cancel each other out, forming a reverse series connection structure.

[0054] For symmetrical parallel operation, that is, M0 and M1 connected in parallel with the same parameters, the control and connection principle is as follows: Upon receiving the symmetrical parallel fault simulation command, auxiliary switch K4 closes and K5 opens; series-parallel switching relay K1 opens to disconnect the series main circuit, parallel branch relay K2 turns on, and polarity switching relay K3 does not operate. The circuit forms two parallel power supply branches: the first branch: [DC positive, M0, DC negative]; the second branch: [DC positive, K2 turns on, M1, DC negative]; the positive terminals of M0 and M1 are interconnected, and the negative terminals of M0 and M1 are interconnected, forming a symmetrical parallel connection between the two motors with the same parameters.

[0055] For asymmetrical parallel operation, the control and connection principle of M0 and M2 with different parameters in asymmetrical parallel operation is as follows: When receiving the asymmetrical parallel fault simulation command, auxiliary switch K5 closes and K4 opens; series-parallel switching relay K1 and polarity switching relay K3 are all opened, while parallel branch relay K2 remains on. The parallel power supply branches are as follows: First branch: [DC positive, M0, DC negative]; Second branch: [DC positive, K2 on, M2, DC negative]; The positive and negative terminals of the two motors are connected accordingly. Due to the inconsistency of the parameters M0 and M2, an asymmetrical parallel connection structure is formed.

[0056] Indicatively, the two sets of auxiliary isolating switches, K4 and K5, have interlocking operation logic, allowing only one set to be closed at a time. This ensures that only one of the faulty simulated motors, M1 or M2, is activated during testing, preventing unnecessary interference loads from being connected to the circuit simultaneously for both M1 and M2. The entire circuit relies on automatic topology switching by electrical switches, eliminating the need to disassemble or modify the wiring of M0 in the original vehicle. All switches are driven to open and close by test commands from the host computer, replacing manual wire disconnection and bridging, which greatly improves testing efficiency. Therefore, the present invention, based on the on / off state of a relay, can achieve automated switching of operating conditions without the need for manual rewiring, greatly improving the efficiency of fault scenario switching and adapting to batch testing; at the same time, the on / off state of the relay is fixed and controllable, and the electrical topology of each test is completely consistent, which can eliminate manual wiring errors and ensure the consistency of test conditions and data repeatability.

[0057] In some embodiments, the present invention may further define the specific electrical wiring logic for three types of fault conditions under motors with the same parameters, and clarify the hardware connection relationship corresponding to each type of instruction.

[0058] The step of connecting the fault simulation brake motor and the brake motor under test in a forward series connection, a reverse series connection, or a symmetrical parallel connection by controlling the switching circuit includes: If the test command is a positive series fault simulation command, the negative terminal of the brake motor under test is connected to the positive terminal of the fault simulation brake motor by controlling the switching circuit, so that the two motors are connected in series in the working circuit with the same power supply polarity to form a positive series connection. If the test command is a reverse series fault simulation command, the negative terminal of the brake motor under test is connected to the negative terminal of the fault simulation brake motor by controlling the switching circuit, so that the two motors are connected in series in the working circuit with opposite power supply polarities to form a reverse series connection. If the test command is a symmetrical parallel fault simulation command, the positive terminals of the fault simulation brake motor and the brake motor under test are connected to each other and the negative terminals are connected to each other through the control switching circuit to form a symmetrical parallel connection.

[0059] Specifically, when a positive series fault command is received, the switching circuit connects the corresponding line, and the negative terminal of the brake motor under test is connected to the positive terminal of the fault simulation brake motor. The polarities of the two motors are in the same direction, and the current flows through them sequentially, forming a positive series structure, and the motors run synchronously in the same direction.

[0060] When a reverse series fault command is received, the switching circuit reverses the previously connected lines, connecting the negative terminal of the brake motor under test to the negative terminal of the fault simulation brake motor. The two motors have opposite polarities and opposite output directions, forming a reverse series structure, and the motors cancel each other out during operation.

[0061] When a symmetrical parallel fault command is received, the circuit is switched to connect the positive terminals of the two motors in pairs and the negative terminals in pairs. The two motors are then connected to the power supply circuit in parallel, with equal voltage and synchronous output, forming a symmetrical parallel structure.

[0062] For example, in the forward series operation, the total circuit impedance increases and the current decreases, which can reproduce the fault of insufficient parking braking force causing the vehicle to roll away; in the reverse series operation, the two motors are stuck together, which can reproduce the fault of EPB parking but release action failure; in the symmetrical parallel operation, the total circuit current doubles, which can reproduce the fault of motor overload causing overheating.

[0063] The embodiments of the present invention precisely define the electrical connection logic for various fault conditions, avoiding safety risks such as short circuits or machine burnout caused by arbitrary wiring by humans, and greatly improving test safety; moreover, the wiring topology of the present invention can completely match the fault mode of the actual vehicle circuit, with high fault simulation reproduction, and the test results can be more in line with the actual vehicle operating conditions.

[0064] Furthermore, the present invention can also define the electrical wiring method for asymmetrical parallel operation, and clarify its topological association and core differences with symmetrical parallel operation.

[0065] The step of connecting the fault simulation brake motor and the brake motor under test in an asymmetrical parallel connection via a control switching circuit includes: By controlling the switching circuit, the positive terminals of the fault simulation brake motor and the brake motor under test are connected to each other, and their negative terminals are connected to each other, forming an asymmetrical parallel connection.

[0066] It is understandable that the asymmetrical parallel operation condition adopts the same electrical topology as the symmetrical parallel operation condition mentioned above. Both are parallel structures with the positive and negative terminals of the two motors connected in the same polarity, without the need for additional circuit lines and switching logic.

[0067] To illustrate, the difference between the two types of parallel operation is not in the circuit wiring, but in the parameters of the motor itself; symmetrical parallel operation uses motors with the same parameters, and the load is evenly distributed; asymmetrical parallel operation uses motors with different parameters, and the load distribution is unbalanced and the operating states are inconsistent, so as to achieve differentiated fault simulation.

[0068] For example, a high-power motor under test and a low-power fault simulation motor are connected in parallel with the same polarity. The circuit topology is normal, but due to the difference in motor parameters, the low-power motor is overloaded and overheats for a long time and its speed is abnormal, while the high-power motor has excess capacity under no-load. This can reproduce the asymmetrical fault of a motor of different specifications being installed in a real vehicle.

[0069] In this embodiment of the invention, the asymmetric parallel circuit reuses the existing parallel circuit topology and switching logic, eliminating the need for additional hardware circuit design and effectively reducing bench development costs; the unified circuit control logic simplifies program development and increases code reusability; and the invention distinguishes fault types by differences in motor parameters, which can better reflect real-world fault scenarios of incorrect installation during vehicle repair.

[0070] In some embodiments, based on the basic testing process, the present invention can further add a real-time security monitoring and automatic protection mechanism to ensure hardware security and operational stability during the testing process, namely: After the abnormal motor connection condition is formed, the present invention also includes: The loop current and motor temperature of the working circuit are collected; wherein, the motor temperature is: the temperature corresponding to the brake motor under test, or the temperature corresponding to the fault simulation brake motor; If the circuit current is greater than a preset current threshold or the motor temperature is greater than a preset temperature threshold, disconnect the fault simulation brake motor from the brake motor under test.

[0071] Indicatively, throughout the entire process of establishing and testing various abnormal motor connection conditions, this invention can also continuously collect real-time current data of the working circuit, and simultaneously collect housing temperature data of the brake motor under test and the fault simulation brake motor, thereby enabling monitoring of the operating status of the test hardware.

[0072] This invention can preset standard current thresholds and temperature thresholds to adapt to different motor models, and can be flexibly configured according to test requirements. When the circuit current exceeds the standard, or the temperature of any motor exceeds the standard in any risky condition, the switching circuit is immediately driven to disconnect the connection circuit between the two motors, quickly relieve the abnormal load, and terminate the fault test.

[0073] For example, in a long-term parallel fault test, if the circuit current continuously exceeds 1.2 times the rated current threshold, or the motor temperature exceeds the 120°C safety threshold, the present invention will automatically disconnect the motor connection circuit without manual operation, thus avoiding safety accidents such as motor overload burnout or high temperature short circuit.

[0074] This invention constructs a two-dimensional real-time safety monitoring process based on current and temperature, and provides proactive protection against two high-frequency risks: motor overload and high-temperature overheating. It effectively protects the original motor under test and the test hardware, reduces test losses and equipment failure rates, and does not interfere with normal data acquisition and fault analysis. While ensuring test safety, it also takes into account test accuracy and efficiency, and is suitable for long-term and multi-round reliability and durability testing scenarios.

[0075] In some embodiments, step S2 is a data acquisition step, in which four types of data are collected synchronously after the abnormal connection condition of the motor is stably established.

[0076] The circuit operating parameters can actually refer to the overall electrical parameters of the working circuit composed of two motors, mainly including the circuit operating voltage, real-time operating current and line equivalent impedance, which can be used to judge the electrical operating status of the entire power supply circuit.

[0077] Different fault conditions exhibit different electrical characteristics. For example, in series operation (either forward or reverse), the total circuit impedance increases and the operating current decreases significantly; in parallel operation (either symmetrical or asymmetrical), the circuit load increases and the current rises significantly. Therefore, by using the circuit's operating parameters, basic electrical faults such as circuit overload, undervoltage, and poor line contact can be quickly identified, while also distinguishing between series and parallel topology faults.

[0078] The first speed corresponding to the brake motor under test refers to the real-time operating speed of the original brake motor under test, which can directly reflect the operating status of the motor under test itself. For example, in the reverse series operation, the outputs of the two motors cancel each other out, and the speed of the motor under test will drop significantly or even stop; in the parallel overload operation, the motor speed fluctuates abnormally. In this case, the first speed is an indicator to determine whether the motor under test has an abnormal operation.

[0079] The second speed corresponding to the fault simulation brake motor refers to the real-time operating speed of the external fault simulation brake motor, which can be used for comparison and analysis with the first speed. Under ideal conditions with the same parameters, such as symmetrical parallel and forward series connection, the speeds of the two motors are basically the same; under asymmetrical parallel connection, the speeds of the two motors will show a significant difference, which can be used to determine whether the load distribution is unbalanced, thereby accurately replicating the fault characteristics of a vehicle with an incorrectly installed motor of a different specification.

[0080] The action status data of the actuator corresponding to the brake motor under test can refer to the operating status of mechanical actuators such as brake calipers and parking cables that are matched with the EPB motor. It can include states such as normal clamping, normal release, action jamming, action lag, insufficient clamping force, and action failure.

[0081] Abnormalities in the motor's electrical system or rotational speed will ultimately manifest in the mechanical actuator. By collecting data on the actuator's operational status, it is possible to verify whether electrical faults cause parking function failures or mechanical jamming, which are common problems in real vehicles. This makes the fault simulation results more consistent with the actual usage scenarios of the vehicle.

[0082] In some embodiments, step S3 is the data analysis and result output stage. It combines all the parameters collected in step S2 for comprehensive evaluation and finally generates standardized fault test results. Each parameter has a clear division of labor in the judgment process and can corroborate each other.

[0083] The embodiments of the present invention do not rely on a single parameter to determine the fault, but integrate and analyze three dimensions of data: circuit electrical parameters, dual motor speeds, and mechanical execution status. First, the fault topology type is distinguished, such as series or parallel connection, then the severity of the fault is determined, and finally a traceable test conclusion is formed.

[0084] First, this invention can determine whether a fault is a series or parallel fault, and at the same time determine whether there are electrical risks such as overload and undercurrent in the circuit, and define the level of electrical fault.

[0085] First, by combining the first and second speeds, the specific fault types are further subdivided. If the speeds of the two motors are synchronously low, it is determined to be a forward series fault; if the speeds of the two motors are close to zero, it is determined to be a reverse series fault; if the speeds of the two motors differ significantly, it is determined to be an asymmetrical parallel fault; if the speeds are the same but the current exceeds the limit, it is determined to be a symmetrical parallel overload fault.

[0086] Then, the impact of electrical faults on the parking function is verified by combining the actuator operation status data. If the speed and current are abnormal and the mechanism is stuck, it is marked as a serious fault; if only the parameters are slightly abnormal and the mechanism operates normally, it is marked as a minor fault.

[0087] Optionally, the final generated fault test results can clearly indicate the fault type, fault level, and abnormal parameter items. This can be used for fault mechanism analysis in the R&D stage, as well as meet the data archiving requirements of production line batch testing, thus automatically completing the entire fault simulation test process.

[0088] As can be seen from the above embodiments, the present invention can optimize many problems existing in the traditional manual cross-connection of original vehicle wiring harness for fault simulation testing. It can automatically construct various abnormal connection conditions based on an external fault simulation brake motor and a relay switching circuit, without modifying the original wiring, connectors and installation structure of the brake motor under test, which greatly reduces hardware wear and maintenance costs during the testing process.

[0089] This invention simulates brake motors by distinguishing between two types of faults: those with the same parameters and those with different parameters. It simulates four types of real vehicle fault conditions: forward series connection, reverse series connection, symmetrical parallel connection, and asymmetrical parallel connection. It can cover typical fault scenarios such as incorrect wiring, incorrect wiring polarity, and incorrect installation of motors of different specifications after-sales service, thus filling the blind spots of traditional testing solutions.

[0090] At the same time, the present invention can also synchronously collect multi-dimensional data such as circuit operating parameters, the speed of the two motors and the action status of the actuator after the abnormal working condition is established. It is no longer limited to the observation of a single parameter. Through multi-source data fusion analysis, the comprehensive judgment of fault type and fault level is completed, making the fault judgment result more accurate.

[0091] At the hardware and circuit design level, this invention uses relays to build the switching circuit, so that symmetrical parallel and asymmetrical parallel connections can reuse the same set of parallel branch topologies. Various series operating conditions share the series main circuit and polarity switching circuit. The circuit structure and control program have a high reuse rate, and there is no need to design hardware and control logic separately for different fault scenarios, which effectively reduces the construction cost of test benches and the difficulty of software development.

[0092] In addition, the present invention adds a dual-dimensional real-time monitoring and automatic protection mechanism for circuit current and motor temperature, which can actively disconnect the motor connection circuit and promptly relieve abnormal load when dangerous conditions such as motor overload or high temperature overheating are detected.

[0093] Please see Figure 3 This application also provides a fault simulation testing device for a parking brake motor, which can implement the above-mentioned fault simulation testing method for a parking brake motor. The device includes: The motor connection control module is used to control the fault simulation brake motor to be connected to the working circuit of the brake motor under test by switching circuits when a test command is received from the brake motor under test, so that the working circuit forms an abnormal motor connection condition. The data acquisition module is used to acquire circuit operating parameters, the first speed corresponding to the brake motor under test, the second speed corresponding to the fault simulation brake motor, and the action status data of the actuator corresponding to the brake motor under test when an abnormal connection condition of the motor is detected. The fault test result generation module is used to generate the fault test result of the brake motor under test under abnormal motor connection conditions based on the circuit operating parameters, the first speed, the second speed, and the actuator action status data.

[0094] It is understood that the content of the above method embodiments is applicable to the present device embodiments. The specific functions implemented by the present device embodiments are the same as those of the above method embodiments, and the beneficial effects achieved are also the same as those achieved by the above method embodiments.

[0095] It should be noted that the device embodiments described above are merely illustrative. The modules described as separate components may or may not be physically separate, and the components shown as modules may or may not be physical modules; they may be located in one place or distributed across multiple network modules. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Furthermore, in the accompanying drawings of the device embodiments provided by this invention, the connection relationships between modules indicate that they have communication connections, which can be specifically implemented as one or more communication buses or signal lines. Those skilled in the art can understand and implement this without any creative effort.

[0096] Those skilled in the art will clearly understand that, for convenience and simplicity, the specific working process of the device described above can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0097] This application also provides an electronic device, which includes a memory and a processor. The memory stores a computer program, and the processor executes the computer program to implement the above-described method for simulating a parking brake motor fault. This electronic device can include any smart terminal such as a tablet computer or an in-vehicle computer.

[0098] It is understood that the content of the above method embodiments is applicable to this device embodiment. The specific functions implemented by this device embodiment are the same as those of the above method embodiments, and the beneficial effects achieved are also the same as those achieved by the above method embodiments.

[0099] Please see Figure 4 , Figure 4 This illustrates the hardware structure of an electronic device according to another embodiment, the electronic device comprising: The processor can be implemented using a general-purpose CPU (Central Processing Unit), microprocessor, application-specific integrated circuit (ASIC), or one or more integrated circuits, and is used to execute relevant programs to achieve the technical solutions provided in the embodiments of this application. The memory can be implemented in the form of read-only memory (ROM), static storage device, dynamic storage device, or random access memory (RAM). The memory can store the operating system and other applications. When the technical solutions provided in the embodiments of this application are implemented through software or firmware, the relevant program code is stored in the memory and called and executed by the processor. Input / output interfaces are used to implement information input and output; The communication interface is used to enable communication and interaction between this device and other devices. Communication can be achieved through wired means (such as USB, Ethernet cable, etc.) or wireless means (such as mobile network, Wi-Fi, Bluetooth, etc.). A bus is used to transfer information between various components of a device, such as processors, memory, input / output interfaces, and communication interfaces. The processor, memory, input / output interface, and communication interface are interconnected within the device via a bus.

[0100] The processor can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor can be a microprocessor or any conventional processor. The processor is the control center of the terminal device, connecting all parts of the terminal device via various interfaces and lines.

[0101] The memory can be used to store the computer program. The processor implements various functions of the terminal device by running or executing the computer program stored in the memory and calling data stored in the memory. The memory may mainly include a program storage area and a data storage area. The program storage area may store the operating system, at least one application program required for a function, etc.; the data storage area may store data created based on the use of the mobile phone, etc. In addition, the memory may include high-speed random access memory, and may also include non-volatile memory, such as hard disk, RAM, plug-in hard disk, smart media card (SMC), secure digital (SD) card, flash card, at least one disk storage device, flash memory device or other volatile solid-state storage device.

[0102] This application also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described method for simulating a parking brake motor fault.

[0103] It is understood that the content of the above method embodiments is applicable to the present computer-readable storage medium embodiments. The specific functions implemented by the present computer-readable storage medium embodiments are the same as those of the above method embodiments, and the beneficial effects achieved are also the same as those achieved by the above method embodiments.

[0104] Those skilled in the art will understand that all or some of the steps, apparatuses, or functional modules / units in the methods disclosed above can be implemented as software, firmware, hardware, or suitable combinations thereof.

[0105] The preferred embodiments of the present application have been described above with reference to the accompanying drawings, but this does not limit the scope of the claims of the present application. Any modifications, equivalent substitutions, and improvements made by those skilled in the art without departing from the scope and substance of the embodiments of the present application shall be within the scope of the claims of the present application.

Claims

1. A fault simulation test method for a parking brake motor, characterized in that, The method includes: When a test command is received for the brake motor under test, a fault simulation brake motor is connected to the working circuit of the brake motor under test by switching circuit control, so that the working circuit forms an abnormal motor connection condition. When an abnormal connection condition of the motor is detected, the circuit operating parameters, the first speed corresponding to the brake motor under test, the second speed corresponding to the fault simulation brake motor, and the action status data of the actuator corresponding to the brake motor under test are collected. Based on the circuit operating parameters, the first speed, the second speed, and the actuator action status data, the fault test results of the brake motor under test under abnormal motor connection conditions are generated.

2. The fault simulation test method for the parking brake motor according to claim 1, characterized in that, The electrical and mechanical parameters of the fault simulation brake motor and the brake motor under test are the same. The step of controlling the fault simulation brake motor to be connected to the working circuit of the brake motor under test by switching circuits includes: By controlling the switching circuit, the fault simulation brake motor and the brake motor under test can be connected in a forward series connection, a reverse series connection, or a symmetrical parallel connection.

3. The fault simulation test method for the parking brake motor according to claim 1, characterized in that, The electrical and mechanical parameters of the fault-simulating brake motor and the brake motor under test are different. The step of controlling the fault simulation brake motor to be connected to the working circuit of the brake motor under test by switching circuits includes: By controlling the switching circuit, the fault simulation brake motor and the brake motor under test are connected in an asymmetrical parallel connection.

4. The fault simulation test method for the parking brake motor according to claim 2, characterized in that, The switching circuit is a relay switching circuit; The step of connecting the fault simulation brake motor and the brake motor under test in a forward series connection, a reverse series connection, or a symmetrical parallel connection via a control switching circuit includes: By controlling the on / off state of the relays inside the relay switching circuit, the fault simulation brake motor and the brake motor under test can be connected in a forward series connection, a reverse series connection, or a symmetrical parallel connection.

5. The fault simulation test method for the parking brake motor according to claim 2, characterized in that, The step of connecting the fault simulation brake motor and the brake motor under test in a forward series connection, a reverse series connection, or a symmetrical parallel connection by controlling the switching circuit includes: If the test command is a positive series fault simulation command, the negative terminal of the brake motor under test is connected to the positive terminal of the fault simulation brake motor by controlling the switching circuit, so that the two motors are connected in series in the working circuit with the same power supply polarity to form a positive series connection. If the test command is a reverse series fault simulation command, the negative terminal of the brake motor under test is connected to the negative terminal of the fault simulation brake motor by controlling the switching circuit, so that the two motors are connected in series in the working circuit with opposite power supply polarities to form a reverse series connection. If the test command is a symmetrical parallel fault simulation command, the positive terminals of the fault simulation brake motor and the brake motor under test are connected to each other and the negative terminals are connected to each other through the control switching circuit to form a symmetrical parallel connection.

6. The fault simulation test method for the parking brake motor according to claim 3, characterized in that, The step of connecting the fault simulation brake motor and the brake motor under test in an asymmetrical parallel connection via a control switching circuit includes: By controlling the switching circuit, the positive terminals of the fault simulation brake motor and the brake motor under test are connected to each other, and their negative terminals are connected to each other, forming an asymmetrical parallel connection.

7. The fault simulation test method for the parking brake motor according to claim 1, characterized in that, After the abnormal motor connection condition is established, the method further includes: The loop current and motor temperature of the working circuit are collected; wherein, the motor temperature is: the temperature corresponding to the brake motor under test, or the temperature corresponding to the fault simulation brake motor; If the circuit current is greater than a preset current threshold or the motor temperature is greater than a preset temperature threshold, disconnect the fault simulation brake motor from the brake motor under test.

8. A fault simulation testing device for a parking brake motor, characterized in that, The device includes: The motor connection control module is used to control the fault simulation brake motor to be connected to the working circuit of the brake motor under test by switching circuits when a test command is received from the brake motor under test, so that the working circuit forms an abnormal motor connection condition. The data acquisition module is used to acquire circuit operating parameters, the first speed corresponding to the brake motor under test, the second speed corresponding to the fault simulation brake motor, and the action status data of the actuator corresponding to the brake motor under test when an abnormal connection condition of the motor is detected. The fault test result generation module is used to generate the fault test result of the brake motor under test under abnormal motor connection conditions based on the circuit operating parameters, the first speed, the second speed, and the actuator action status data.

9. An electronic device, characterized in that, The electronic device includes a memory and a processor. The memory stores a computer program, and when the processor executes the computer program, it implements a fault simulation test method for a parking brake motor as described in any one of claims 1 to 7.

10. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements a fault simulation test method for a parking brake motor according to any one of claims 1 to 7.

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