An under-voltage protection control method and system, electronic device, and storage medium

Abstract

The application discloses a kind of under-voltage protection control method, system, electronic equipment and storage medium, it is related to electrical protection field, through the contact action of two under-voltage relays and its corresponding voltage setting value determine whether the first under-voltage relay and the second under-voltage relay exist fault, and when two under-voltage relays exist fault, further by obtaining the current voltage of control battery judges whether control battery appears under-voltage condition, can quickly, accurately realize the judgment of whether the under-voltage of the control battery of electric locomotive, simultaneously can also realize the accurate diagnosis of whether two under-voltage relays are fault, avoid the error protection of locomotive due to under-voltage relay itself fault, further improve the accuracy and reliability of the judgment process of whether the under-voltage of control battery, simple and easy, without needing to transform the control circuit or control system of electric locomotive itself, guarantee the normal operation of electric locomotive, improve the reliability of entire vehicle.

Description

Technical Field

[0001] This invention relates to the field of electrical protection, and in particular to a control method, system, electronic device, and storage medium for undervoltage protection. Background Technology

[0002] With the continuous development of technology in vehicles such as electric locomotives, users have increasingly higher requirements for vehicle safety and reliability. The control battery primarily provides control power to electric locomotives and other vehicles, thereby driving the normal operation of the vehicle's control system and internal components such as relays and contactors. If the control battery voltage falls below a certain value, resulting in undervoltage, it cannot provide normal control power. Consequently, the control system, relays, contactors, and other components of the electric locomotive will malfunction, and the locomotive will be unable to operate normally. Therefore, how to effectively detect undervoltage in the control battery is a technical problem that urgently needs to be solved.

[0003] In existing technologies, undervoltage relays are typically used to directly protect the control battery from undervoltage. However, undervoltage relays may experience problems such as decreased accuracy or poor contact during use, leading to erroneous operation of the undervoltage relay, i.e., failure to operate when it should or operation when it should not. This can result in the control battery not being undervoltage protected or the undervoltage protection being triggered erroneously, all of which can seriously affect the normal operation of the locomotive. Summary of the Invention

[0004] The purpose of this invention is to provide a control method, system, electronic device, and storage medium for undervoltage protection. This method can quickly and accurately determine whether the control battery of an electric locomotive is undervoltage, and can also accurately diagnose whether the two undervoltage relays are faulty. This avoids erroneous protection of the locomotive caused by the failure of the undervoltage relays themselves, further improving the accuracy and reliability of the process of determining whether the control battery is undervoltage. The method is simple and easy to implement, requiring no modification to the control circuit or control system of the electric locomotive itself, ensuring the normal operation of the electric locomotive and improving the overall reliability of the vehicle.

[0005] To solve the above technical problems, the present invention provides a control method for undervoltage protection, applied to the controller of an undervoltage protection device. The undervoltage protection device further includes a first undervoltage relay and a second undervoltage relay. The coils of the first and second undervoltage relays are connected in parallel across the two ends of a control battery. One end of the contact of the first and second undervoltage relays is connected to the input terminal of the controller. The control method includes:

[0006] Determine the contact operation status of the first undervoltage relay and the contact operation status of the second undervoltage relay, wherein the first voltage setting value corresponding to the first undervoltage relay is different from the second voltage setting value corresponding to the second undervoltage relay;

[0007] Based on the first voltage setting value, the second voltage setting value, the contact operation of the first undervoltage relay, and the contact operation of the second undervoltage relay, determine whether the first undervoltage relay or the second undervoltage relay is faulty;

[0008] If so, the current voltage of the control battery is obtained, and based on the current voltage of the control battery, it is determined whether the control battery is undervoltage and the fault status of the first undervoltage relay and the second undervoltage relay.

[0009] Optionally, when the first voltage setting value corresponding to the first undervoltage relay is greater than the second voltage setting value corresponding to the second undervoltage relay, the step of determining whether the first undervoltage relay or the second undervoltage relay is faulty based on the first voltage setting value, the second voltage setting value, the contact operation status of the first undervoltage relay, and the contact operation status of the second undervoltage relay includes:

[0010] If the contacts of the first undervoltage relay do not operate and the contacts of the second undervoltage relay operate, it is determined that either the first undervoltage relay or the second undervoltage relay is faulty.

[0011] If neither the contact of the first undervoltage relay nor the contact of the second undervoltage relay is activated, it is determined that there is no fault in either the first or second undervoltage relay, and the control battery is not undervoltage.

[0012] If the contacts of the first undervoltage relay actuate and the contacts of the second undervoltage relay do not actuate, it is determined that neither the first undervoltage relay nor the second undervoltage relay is faulty, and the control battery is not undervoltage, but there is a risk of undervoltage.

[0013] When both the contacts of the first undervoltage relay and the second undervoltage relay are activated, it is determined that the first or second undervoltage relay is not faulty, and the control battery is undervoltage.

[0014] Optionally, when the first voltage setting value corresponding to the first undervoltage relay is greater than the second voltage setting value corresponding to the second undervoltage relay, determining whether the control battery is undervoltage and the fault status of the first and second undervoltage relays based on the current voltage of the control battery includes:

[0015] Determine whether the current voltage of the control battery is less than a preset voltage value, wherein the preset voltage value is greater than the second voltage setting value corresponding to the second undervoltage relay and less than the first voltage setting value corresponding to the first undervoltage relay;

[0016] If so, it is determined that the control battery is undervoltage and the first undervoltage relay is faulty;

[0017] If not, it is determined that the control battery is not undervoltage and the second undervoltage relay is faulty.

[0018] Optionally, the undervoltage protection device further includes a warning module, and the control method further includes:

[0019] When any one or more of the following situations occur: the control battery is undervoltage, the first undervoltage relay malfunctions, and the second undervoltage relay malfunctions, the prompting module is controlled to execute the corresponding prompting strategy.

[0020] Optionally, the fixed terminal of the first undervoltage relay contact is connected to the power supply, the first switching terminal is connected to the input terminal of the controller, and the second switching terminal is left floating; the fixed terminal of the second undervoltage relay contact is connected to the power supply, the first switching terminal is connected to the input terminal of the controller, and the second switching terminal is left floating; determining the contact operation status of the first and second undervoltage relays includes:

[0021] The contact operation of the first undervoltage relay is determined based on the difference in the level signal before and after the contact switching of the first undervoltage relay.

[0022] The contact operation of the second undervoltage relay is determined based on the difference in the level signal before and after the contact switching of the second undervoltage relay.

[0023] Optionally, the undervoltage protection device further includes a control battery detection system, the input terminal of which is connected to the output terminal of the control battery, and the step of acquiring the current voltage of the control battery includes:

[0024] Receives an analog signal of the current voltage of the control battery detected by the control battery detection system.

[0025] Optionally, the control battery detection system and the controller communicate with each other via a communication bus.

[0026] To solve the above-mentioned technical problems, the present invention also provides an undervoltage protection control system applied to the controller of an undervoltage protection device. The undervoltage protection device further includes a first undervoltage relay and a second undervoltage relay. The coils of the first and second undervoltage relays are both connected in parallel across the two ends of a control battery. One end of the contact of the first and second undervoltage relays is connected to the input terminal of the controller. The control system includes:

[0027] The contact operation status determination unit is used to determine the contact operation status of the first undervoltage relay and the contact operation status of the second undervoltage relay, wherein the first voltage setting value corresponding to the first undervoltage relay is different from the second voltage setting value corresponding to the second undervoltage relay.

[0028] The fault determination unit is used to determine whether the first undervoltage relay or the second undervoltage relay is faulty based on the first voltage setting value, the second voltage setting value, the contact operation status of the first undervoltage relay, and the contact operation status of the second undervoltage relay; if so, it triggers the voltage acquisition unit.

[0029] The voltage acquisition unit is used to acquire the current voltage of the control battery, and determine whether the control battery is undervoltage and the fault status of the first undervoltage relay and the second undervoltage relay based on the current voltage of the control battery.

[0030] To address the aforementioned technical problems, the present invention also provides an electronic device, comprising:

[0031] Memory, used to store computer programs;

[0032] A controller for implementing the control method for undervoltage protection as described above.

[0033] To address the aforementioned technical problems, the present invention also provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the steps of the undervoltage protection control method described above.

[0034] This invention provides a control method for undervoltage protection. It determines whether the first and second undervoltage relays are faulty by analyzing their contact operation and the corresponding voltage settings. If both relays are faulty, the method further determines whether the control battery is undervoltage by acquiring the current voltage of the control battery. This method allows for quick and accurate determination of undervoltage in the electric locomotive's control battery, and also enables accurate diagnosis of faults in the two undervoltage relays. It avoids incorrect protection caused by faulty relays, further improving the accuracy and reliability of the control battery undervoltage determination process. The method is simple and easy to implement, requiring no modification to the locomotive's control circuitry or system, ensuring the normal operation of the electric locomotive and improving the overall reliability of the vehicle.

[0035] The present invention also provides an undervoltage protection control system, electronic device, and computer-readable storage medium, which have the same beneficial effects as the undervoltage protection control method described above. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the prior art and embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 A flowchart illustrating an undervoltage protection control method provided by the present invention;

[0038] Figure 2 A schematic diagram of an undervoltage relay provided by the present invention;

[0039] Figure 3 This is a schematic diagram of an undervoltage protection device provided by the present invention;

[0040] Figure 4 A flowchart illustrating another undervoltage protection control method provided by the present invention;

[0041] Figure 5 A schematic diagram of the structure of an undervoltage protection control system provided by the present invention;

[0042] Figure 6 This is a schematic diagram of the structure of an electronic device provided by the present invention. Detailed Implementation

[0043] The core of this invention is to provide a control method, system, electronic device, and storage medium for undervoltage protection. This method can quickly and accurately determine whether the control battery of an electric locomotive is undervoltage, and also accurately diagnose whether the two undervoltage relays are faulty. This avoids erroneous protection of the locomotive due to faulty undervoltage relays, further improving the accuracy and reliability of the process for determining whether the control battery is undervoltage. It is simple and easy to implement, requiring no modification to the control circuit or control system of the electric locomotive itself, ensuring the normal operation of the electric locomotive and improving the overall reliability of the vehicle.

[0044] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] Please refer to Figure 1 , Figure 1 This is a flowchart illustrating an undervoltage protection control method provided by the present invention; please refer to... Figure 2 , Figure 2 This invention provides a structural schematic diagram of an undervoltage relay. To solve the above-mentioned technical problems, this invention provides a control method for undervoltage protection, applied to the controller of an undervoltage protection device. The undervoltage protection device further includes a first undervoltage relay and a second undervoltage relay. The coils of the first and second undervoltage relays are both connected in parallel across the two ends of a control battery. One end of the contact of the first and second undervoltage relays is connected to the input terminal of the controller. The control method includes:

[0046] S11: Determine the contact operation status of the first undervoltage relay and the contact operation status of the second undervoltage relay. The first voltage setting value corresponding to the first undervoltage relay is different from the second voltage setting value corresponding to the second undervoltage relay.

[0047] Understandably, an undervoltage relay operates by adjusting the voltage level, making it a purely mechanical device. After setting the appropriate voltage setting for the undervoltage relay based on the application, the two ends of the undervoltage relay coil are connected in parallel to the two ends of the control battery. The controller's input is then connected to one end of the undervoltage relay's contact. The operation of the undervoltage relay's contact is determined by the voltage change at this end. When the voltage across the control battery, i.e., the control battery's output voltage, falls below the set voltage, the undervoltage relay's contact will activate, thus protecting the control battery from voltage fluctuations.

[0048] Considering the reliability and safety of the control battery and vehicle operation, undervoltage relays are typically divided into two levels: undervoltage warning and undervoltage protection. Therefore, a first undervoltage relay and a second undervoltage relay are usually set up to implement the undervoltage warning and protection processes respectively. Taking an 88V and a 77V undervoltage relay as examples, if the output voltage of the control battery drops below 77V, the control battery will be unable to output control power normally, and the locomotive's control system, relays, contactors, and other components will malfunction, causing the locomotive to malfunction. In this case, undervoltage protection of the control battery is required. When the output voltage of the control battery drops below 88V, the control battery can still output control power normally, and the locomotive can still operate normally. However, this voltage is already low and may cause abnormal situations. Therefore, undervoltage warning of the control battery is required in this case so that operators can promptly detect potential undervoltage situations and prevent the vehicle from malfunctioning.

[0049] S12: Determine whether the first or second undervoltage relay is faulty based on the first voltage setting value, the second voltage setting value, the contact operation of the first undervoltage relay, and the contact operation of the second undervoltage relay.

[0050] It is easy to understand that the controller can determine the first voltage setting value corresponding to the first undervoltage relay and the second voltage setting value corresponding to the second undervoltage relay based on the setting method of the first and second undervoltage relays. Then, based on the contact operation of the first and second undervoltage relays, it can determine the current state of the battery's output voltage and whether the contact operation of the first and second undervoltage relays is consistent with the magnitude of their corresponding voltage setting values, thereby determining whether the first or second undervoltage relay is faulty.

[0051] Specifically, taking a first voltage setting value greater than a second voltage setting value as an example, if the output voltage of the control battery drops, its output voltage should be lower than the first voltage setting value for a certain period of time before falling below the second voltage setting value. In this case, if either the first or second undervoltage relay operates, the first undervoltage relay's contact must operate before the second undervoltage relay's contact. If the second undervoltage relay's contact operates before the first undervoltage relay's contact, it indicates that at least one of the first or second undervoltage relays is faulty. Conversely, if the first voltage setting value is less than the second voltage setting value, the second undervoltage relay's contact should operate before the first undervoltage relay's contact.

[0052] S13: If yes, then obtain the current voltage of the control battery, and determine whether the control battery is undervoltage and the fault status of the first undervoltage relay and the second undervoltage relay based on the current voltage of the control battery.

[0053] Understandably, when the first or second undervoltage relay malfunctions, the judgment of the control battery's output voltage based on the contact action of the first and second undervoltage relays will be inaccurate. Relying solely on the contact action of the first and second undervoltage relays is insufficient to accurately and effectively determine the control battery's undervoltage protection and undervoltage warning. Therefore, the controller needs to obtain the current output voltage of the control battery and then judge the control battery's output voltage based on the obtained current voltage to determine whether the control battery is undervoltage and execute the corresponding undervoltage protection and undervoltage warning operations.

[0054] It is easy to understand that if the first and second undervoltage relays are functioning correctly, they can accurately determine the current voltage output of the control battery. In this case, the output voltage of the control battery can be determined directly based on the contact action of the first and second undervoltage relays, thus enabling undervoltage protection and undervoltage warning for the control battery. This application does not specifically limit the specific implementation method of the controller acquiring the current voltage of the control battery; it can be achieved by additionally setting up a detection module or acquisition device.

[0055] It should be noted that this application does not impose any special limitations on the specific types and implementation methods of the first undervoltage relay, the second undervoltage relay, and the controller. The controller can be implemented in various ways, such as using a control chip or a control circuit. The specific values ​​of the first voltage setting value and the second voltage setting value corresponding to the first undervoltage relay and the second undervoltage relay can be set according to the actual application scenario.

[0056] It is understood that the undervoltage protection control method provided by this invention is applicable to the rail transit electric locomotive industry. As an undervoltage protection device and control method for the control battery of an electric locomotive, it implements the undervoltage protection process for the control battery. The control battery primarily provides the electric locomotive with a DC (Direct Current) 110V control power supply, thereby driving the locomotive's control system and contactors, enabling the normal operation of the electric locomotive. The undervoltage protection control method provided by this invention can also be applied to control batteries of other types of vehicles or other types of batteries to achieve the undervoltage protection process.

[0057] This invention provides a control method for undervoltage protection. It determines whether the first and second undervoltage relays are faulty by analyzing their contact operation and the corresponding voltage settings. If both relays are faulty, the method further determines whether the control battery is undervoltage by acquiring the current voltage of the control battery. This method allows for quick and accurate determination of undervoltage in the electric locomotive's control battery, and also enables accurate diagnosis of faults in the two undervoltage relays. It avoids incorrect protection caused by faulty relays, further improving the accuracy and reliability of the control battery undervoltage determination process. The method is simple and easy to implement, requiring no modification to the locomotive's control circuitry or system, ensuring the normal operation of the electric locomotive and improving the overall reliability of the vehicle.

[0058] Based on the above embodiments, please refer to Figure 3 , Figure 3 This is a schematic diagram of an undervoltage protection device provided by the present invention; please refer to... Figure 4 , Figure 4 This is a flowchart illustrating another undervoltage protection control method provided by the present invention.

[0059] As an optional embodiment, when the first voltage setting value corresponding to the first undervoltage relay is greater than the second voltage setting value corresponding to the second undervoltage relay, determining whether the first or second undervoltage relay is faulty based on the first voltage setting value, the second voltage setting value, the contact operation status of the first undervoltage relay, and the contact operation status of the second undervoltage relay includes:

[0060] If the contacts of the first undervoltage relay do not operate and the contacts of the second undervoltage relay operate, it is determined that either the first undervoltage relay or the second undervoltage relay is faulty.

[0061] If neither the contacts of the first undervoltage relay nor the contacts of the second undervoltage relay are activated, it is determined that there is no fault in either the first or second undervoltage relay, and the control battery is not undervoltage.

[0062] If the contacts of the first undervoltage relay actuate and the contacts of the second undervoltage relay do not actuate, it is determined that there is no fault in either the first or second undervoltage relay, and the control battery is not undervoltage, but there is a risk of undervoltage.

[0063] If both the contacts of the first undervoltage relay and the second undervoltage relay are activated, then there is no fault in either the first or second undervoltage relay, and it is determined that the control battery is undervoltage.

[0064] Understandably, based on the first voltage setting value, the second voltage setting value, and the contact operation of the first and second undervoltage relays, it is possible to determine the fault status of the first and second undervoltage relays, as well as whether the control battery is undervoltage and the risk of undervoltage. When the first voltage setting value is greater than the second setting value, if either the first or second undervoltage relay has contact operation, the first undervoltage relay's contact should operate before the second undervoltage relay's contact. Based on this, it is possible to determine the fault status of the first and second undervoltage relays, and, if neither relay is faulty, to determine whether the control battery is undervoltage and the risk of undervoltage.

[0065] It is easy to understand that, based on the first voltage setting value, the second voltage setting value, and the contact operation of the first and second undervoltage relays, accurate judgment can be made regarding the fault status of the first and second undervoltage relays, as well as whether the control battery is undervoltage and the risk of undervoltage. The entire solution is simple and easy to implement, requiring no separate modification to the original control circuit and control system of the electric locomotive. It can accurately determine whether the locomotive's control battery is undervoltage, avoiding erroneous protection caused by the fault of the undervoltage relay itself, ensuring the normal operation of the electric locomotive, and improving the reliability of the vehicle.

[0066] As an optional embodiment, when the first voltage setting value corresponding to the first undervoltage relay is greater than the second voltage setting value corresponding to the second undervoltage relay, determining whether the control battery is undervoltage and the fault status of the first and second undervoltage relays based on the current voltage of the control battery includes:

[0067] Determine whether the current voltage of the control battery is less than the preset voltage value. The preset voltage value is greater than the second voltage setting value corresponding to the second undervoltage relay and less than the first voltage setting value corresponding to the first undervoltage relay.

[0068] If so, it is determined that the control battery is undervoltage and the first undervoltage relay is faulty;

[0069] If not, it is determined that the control battery is not undervoltage and the second undervoltage relay is faulty.

[0070] Understandably, after obtaining the current voltage of the control battery, the controller also needs to determine whether the current voltage is lower than a preset voltage value to identify if the control battery is undervoltage. After accurately determining whether the control battery is undervoltage, the controller then assesses the fault status of the first and second undervoltage relays based on the undervoltage condition. If the first undervoltage relay's contact is not activated while the second undervoltage relay's contact is activated, at least one of the two relays is faulty. If the control battery is undervoltage, both the first and second undervoltage relays should activate, but since the first relay's contact is not activated, it can be determined that the first undervoltage relay is faulty. Conversely, if the control battery is not undervoltage, neither the first nor the second undervoltage relay's contact should activate, but since the second relay's contact is activated, it can be determined that the second undervoltage relay is faulty.

[0071] It should be noted that this application does not specifically limit the specific value of the preset voltage. When the first voltage setting value corresponding to the first undervoltage relay is greater than the second voltage setting value corresponding to the second undervoltage relay, the preset voltage value is usually set to be greater than the second voltage setting value corresponding to the second undervoltage relay and less than the first voltage setting value corresponding to the first undervoltage relay. When the output of the control battery is less than the second voltage setting value, the control battery is undervoltage and cannot drive the vehicle normally. When the output of the control battery is greater than the second voltage setting value and less than the preset voltage value, the control battery is not undervoltage, but the output voltage is already very low, and an undervoltage warning needs to be issued immediately so that the operator can handle it in time. When the output of the control battery is greater than the preset voltage value and less than the first voltage setting value, the control battery is not undervoltage, but the output voltage is low, and an undervoltage warning needs to be issued. When the output of the control battery is greater than the first voltage setting value, the control battery is not undervoltage and can work normally.

[0072] Specifically, taking an 88V undervoltage relay as the first undervoltage relay and a 77V undervoltage relay as the second undervoltage relay as an example, the controller is used to comprehensively control and judge undervoltage protection. The preset voltage value in the controller can be set to 83V. If neither the 88V nor the 77V undervoltage relay operates, it is determined that the control battery is not undervoltage, the locomotive is not undervoltage, and it can operate normally. If the 88V undervoltage relay operates but the 77V undervoltage relay does not, it is determined that the locomotive is only undervoltage at 88V and can operate normally, but the driver should be alerted to the risk of battery undervoltage. If the 88V undervoltage relay does not operate but the 77V undervoltage relay operates, it is determined that one of the relays is faulty. Then, based on the current voltage output of the control battery obtained by the controller, it is determined whether the control battery is truly undervoltage. If both the 88V and 77V undervoltage relays operate, it is determined that the control battery is undervoltage, the locomotive is undervoltage, and it cannot operate normally. Stopping or shutting down operations are required to ensure safety.

[0073] It is easy to understand that after the controller obtains the current voltage of the control battery, it needs to determine whether the control battery is undervoltage and the fault status of the two undervoltage relays based on the current voltage. This further improves the process of determining the status of the control battery based on the current voltage and accurately locating the fault status of the two undervoltage relays, making it easier for operators to troubleshoot in a timely manner and ensuring the reliability and safety of the entire vehicle.

[0074] As an optional embodiment, the undervoltage protection device further includes a warning module, and the control method further includes:

[0075] When any one or more of the following situations occur: the control battery is undervoltage, the first undervoltage relay malfunctions, or the second undervoltage relay malfunctions, the control prompt module executes the corresponding prompt strategy.

[0076] It is understandable that when the control battery experiences undervoltage, the first undervoltage relay malfunctions, the second undervoltage relay malfunctions, or there is a risk of undervoltage in the control battery, certain prompts and warnings are needed to facilitate timely notification to operators. Therefore, a prompt module connected to the controller can be added to provide prompts and alarms for these fault conditions. This application does not specifically limit the specific type and implementation method of the prompt module; it can be implemented using indicator lights, buzzers, and audible and visual alarms. Different prompting methods can be used for different fault conditions, or multiple prompt sub-modules can be set up to differentiate between various fault conditions.

[0077] Specifically, a prompting module connected to the controller can be added to provide prompts and alarms for different fault conditions. This will clearly and intuitively reflect the fault conditions of the control battery, the first undervoltage relay, and the second undervoltage relay, making it easier for operators to detect faults in a timely manner and perform corresponding troubleshooting operations, thereby further ensuring the reliability and safety of the entire vehicle.

[0078] In one optional embodiment, the fixed terminal of the contact of the first undervoltage relay is connected to the power supply, the first switching terminal is connected to the input terminal of the controller, and the second switching terminal is left floating. Similarly, the fixed terminal of the contact of the second undervoltage relay is connected to the power supply, the first switching terminal is connected to the input terminal of the controller, and the second switching terminal is left floating. Determining the contact operation of the first and second undervoltage relays includes:

[0079] The contact operation of the first undervoltage relay is determined based on the difference in the level signal before and after the contact switching of the first undervoltage relay.

[0080] The contact operation of the second undervoltage relay is determined based on the difference in the level signal before and after the contact switching of the second undervoltage relay.

[0081] It's easy to understand that the fixed terminal of the undervoltage relay contacts can be connected to the power supply, while the two switching terminals can be connected to the controller's input terminals or left floating. The power supply can be directly provided by the DC control power output from the control battery. The controller's input terminals can use an IO (Input / Output) module to collect data on the contact operation of the first and second undervoltage relays. The first and second undervoltage relays operate on the same principle. Figure 2 For example, DC+ represents the positive terminal controlling the output voltage of the battery, and DC- represents the negative terminal controlling the output voltage of the battery. A1 and A2 are the two ends of the coil of the undervoltage relay. When the control current DC+ is greater than the corresponding voltage setting value, the contacts of the undervoltage relay actuate, and the fixed terminal 11 of the contact closes with the second switching terminal 14 of the contact. At this time, the signal collected by the I / O module at the input terminal of the controller is 0, that is, a low-level signal. At this time, the control current output by the battery is greater than the voltage setting value. Conversely, when the control current DC+ is less than the voltage setting value, the contacts of the undervoltage relay do not actuate, and the fixed terminal 11 of the contact closes with the first switching terminal 12 of the contact. The signal collected by the I / O module is 1, that is, a high-level signal. At this time, the control current output by the battery is less than the voltage setting value.

[0082] Specifically, the contact operation of the undervoltage relay can be determined by the difference in the level signal before and after the contact switching of the undervoltage relay. The connection structure of the entire undervoltage relay is simple and easy to implement. The controller can accurately obtain the contact operation of the first undervoltage relay and the contact operation of the second undervoltage relay based on the level signal.

[0083] As an optional embodiment, the undervoltage protection device further includes a control battery detection system, the input of which is connected to the output of the control battery, to obtain the current voltage of the control battery, including:

[0084] Receives the analog signal of the current voltage of the control battery detected by the control battery detection system.

[0085] It is easy to understand that the control battery detection system can acquire and monitor the analog signal of the current output voltage of the control battery through components such as voltage sensors and bus controllers. Considering the data communication between the control battery detection system and the controller, the control battery detection system can also have bus communication functionality, acting as a bus control device. When the analog signal of the current output voltage of the control battery is acquired, the control battery detection system sends it to the controller via bus communication. The controller receives the bus signal corresponding to the analog signal of the current battery voltage via bus communication, thereby determining whether the locomotive is truly under-voltage. This application does not specifically limit the specific type and implementation method of the control battery detection system; it can be implemented using detection devices such as voltage sensors. Similarly, this application does not specifically limit the connection method and data communication method between the control battery detection system and the controller, and is not limited to the aforementioned communication bus method.

[0086] Specifically, the controller collects the status of the first and second undervoltage relays, i.e., the contact operation, and combines this with the voltage analog quantity acquisition function of the control battery detection system to accurately determine whether the control battery in the electric locomotive is undervoltage. This avoids erroneous protection of the locomotive due to the failure of the undervoltage relay itself, ensures the normal operation of the electric locomotive, and improves the reliability of the vehicle.

[0087] As an optional embodiment, the battery detection system and the controller communicate data via a communication bus.

[0088] It is easy to understand that the battery detection system and the controller can communicate with each other via a communication bus. This application does not make any special restrictions on the specific type and implementation method of the communication bus.

[0089] Specifically, the communication bus method offers high reliability, ease of expansion, ease of installation, simple structure, and easy wiring, which facilitates the flexible implementation of the entire undervoltage protection control method and further expands the applicability of the entire undervoltage protection device.

[0090] As a specific embodiment, with Figure 3 and Figure 4 For example, the undervoltage protection device includes an IO module, a CCU (Central Control Unit) module as a controller, an HMI (Human Machine Interface) module for display and prompts, and a control battery detection system. The undervoltage relays are 88V and 77V, with a preset voltage value set to 83V. Other modules can also be set in the undervoltage protection device to realize other functions. The various modules communicate and control each other through a communication bus. The status of the 88V and 77V undervoltage relays is collected by the IO module. The IO module sends the status of the two undervoltage relays, i.e., the contact operation status, to the CCU module. The CCU module combines the status of the two undervoltage relays sent by the IO module with the analog signal corresponding to the current voltage of the control battery sent by the control battery detection system to perform logic control and judgment to realize operations such as undervoltage protection of the control battery. The HMI module displays the status and provides fault prompts.

[0091] Specifically, the controller's logic control and judgment process includes: if neither the 88V undervoltage relay nor the 77V undervoltage relay activates, the locomotive is determined to be not undervoltage and can operate normally; if the 88V undervoltage relay activates but the 77V undervoltage relay does not activate, the locomotive is determined to be undervoltage only at 88V and can operate normally, but the HMI module must alert the driver of the risk of battery undervoltage; if both the 88V and 77V undervoltage relays activate, the locomotive is determined to be undervoltage and cannot operate normally, requiring the vehicle to be stopped and shut down; if the 88V undervoltage relay does not activate but the 77V undervoltage relay does not activate, the locomotive is determined to be undervoltage and cannot operate normally, requiring the vehicle to be stopped and shut down; if the 88V undervoltage relay does not activate but the 77V undervoltage relay does not activate, the locomotive is determined to be undervoltage and cannot operate normally, requiring the vehicle to be stopped and shut down. If the system detects an error, it determines that one of the two undervoltage relays is faulty. Then, based on the analog current battery voltage collected by the control battery detection system, the following comprehensive judgment is made: If the analog current battery voltage is ≥83V, it indicates that the locomotive is not undervoltage, only the 77V undervoltage relay is faulty, and the locomotive can operate normally, but the HMI will indicate a 77V undervoltage relay fault; if the analog current battery voltage is <83V, it indicates that the locomotive is undervoltage, and the 88V undervoltage relay is faulty and has not operated correctly. In this case, the locomotive cannot operate normally and must be stopped and shut down.

[0092] The entire undervoltage protection device collects the status of the 88V and 77V undervoltage relays through the I / O module. Combined with the analog battery voltage collected by the control battery detection system, it accurately determines whether the locomotive's control battery is undervoltage and whether the undervoltage relays are faulty. This achieves accurate determination of whether the locomotive's control battery is undervoltage and simultaneously diagnoses whether the 88V and 77V undervoltage relays are faulty, preventing erroneous protection caused by faulty undervoltage relays, ensuring the normal operation of the locomotive, and improving vehicle reliability. It has good applicability to electric locomotives. Based on the locomotive's existing TCMS (Train Control and Management System), only the control logic of the CCU and HMI modules needs to be modified. No modification to hardware or electrical circuits is required, making it simple and easy to implement. It can quickly and accurately diagnose whether the locomotive's control battery is undervoltage and whether the undervoltage relays are faulty.

[0093] Please refer to Figure 5 , Figure 5 This invention provides a schematic diagram of an undervoltage protection control system. To solve the above-mentioned technical problems, this invention also provides an undervoltage protection control system applied to a controller of an undervoltage protection device. The undervoltage protection device further includes a first undervoltage relay and a second undervoltage relay. The coils of the first and second undervoltage relays are connected in parallel across the two ends of a control battery. One end of the contact of the first and second undervoltage relays is connected to the input terminal of the controller. The control system includes:

[0094] The contact operation determination unit 11 is used to determine the contact operation status of the first undervoltage relay and the contact operation status of the second undervoltage relay, wherein the first voltage setting value corresponding to the first undervoltage relay is different from the second voltage setting value corresponding to the second undervoltage relay.

[0095] The fault determination unit 12 is used to determine whether the first undervoltage relay or the second undervoltage relay is faulty based on the first voltage setting value, the second voltage setting value, the contact operation status of the first undervoltage relay and the contact operation status of the second undervoltage relay; if so, the voltage acquisition unit is triggered.

[0096] The voltage acquisition unit 13 is used to acquire the current voltage of the control battery, and determine whether the control battery is undervoltage and the fault status of the first undervoltage relay and the second undervoltage relay based on the current voltage of the control battery.

[0097] As an optional embodiment, when the first voltage setting value corresponding to the first undervoltage relay is greater than the second voltage setting value corresponding to the second undervoltage relay, the fault determination unit 12 includes:

[0098] The first determination unit is used to determine that either the first undervoltage relay or the second undervoltage relay is faulty when the contacts of the first undervoltage relay do not operate and the contacts of the second undervoltage relay operate.

[0099] The second determination unit is used to determine that if neither the contact of the first undervoltage relay nor the contact of the second undervoltage relay operates, then the first undervoltage relay or the second undervoltage relay is not faulty and the control battery is not undervoltage.

[0100] The third determination unit is used to determine that if the contacts of the first undervoltage relay are activated and the contacts of the second undervoltage relay are not activated, then the first undervoltage relay or the second undervoltage relay is not faulty, and the control battery is not undervoltage, but there is a risk of undervoltage.

[0101] The fourth determination unit is used to determine that if both the contacts of the first undervoltage relay and the contacts of the second undervoltage relay are activated, then the first undervoltage relay or the second undervoltage relay is not faulty, and the control battery is undervoltage.

[0102] As an optional embodiment, when the first voltage setting value corresponding to the first undervoltage relay is greater than the second voltage setting value corresponding to the second undervoltage relay, the voltage acquisition unit 13 includes:

[0103] The judgment unit is used to determine whether the current voltage of the control battery is less than a preset voltage value, wherein the preset voltage value is greater than the second voltage setting value corresponding to the second undervoltage relay and less than the first voltage setting value corresponding to the first undervoltage relay; if yes, the fifth judgment unit is triggered, and if no, the sixth judgment unit is triggered.

[0104] The fifth determination unit is used to determine that the control battery is undervoltage and that the first undervoltage relay is faulty.

[0105] The sixth determination unit is used to determine that the control battery is not undervoltage and that the second undervoltage relay is faulty.

[0106] As an optional embodiment, the undervoltage protection device further includes a warning module, and also includes:

[0107] The prompting unit is used to control the prompting module to execute the corresponding prompting strategy when any one or more of the following conditions exist: the control battery is undervoltage, the first undervoltage relay is faulty, and the second undervoltage relay is faulty.

[0108] In one optional embodiment, the fixed terminal of the contact of the first undervoltage relay is connected to the power supply, the first switching terminal is connected to the input terminal of the controller, and the second switching terminal is left floating. The fixed terminal of the contact of the second undervoltage relay is connected to the power supply, the first switching terminal is connected to the input terminal of the controller, and the second switching terminal is left floating. The contact operation determination unit 11 includes:

[0109] The first contact operation determination subunit is used to determine the contact operation status of the first undervoltage relay based on the difference in the level signal before and after the contact switching of the first undervoltage relay.

[0110] The second contact operation determination subunit is used to determine the contact operation status of the second undervoltage relay based on the difference in the level signal before and after the contact switching of the second undervoltage relay.

[0111] As an optional embodiment, the undervoltage protection device further includes a control battery detection system, the input terminal of which is connected to the output terminal of the control battery, and the voltage acquisition unit 13 includes:

[0112] The analog signal receiving unit is used to receive the analog signal of the current voltage of the control battery detected by the control battery detection system.

[0113] For an introduction to the undervoltage protection control system provided by the present invention, please refer to the embodiments of the undervoltage protection control method described above. The present invention will not be described again here.

[0114] Please refer to Figure 6 , Figure 6 This is a schematic diagram of the structure of an electronic device provided by the present invention. To solve the above-mentioned technical problems, the present invention also provides an electronic device, comprising:

[0115] Memory 21 is used to store computer programs;

[0116] Controller 22 is used to implement the steps of the control method for undervoltage protection as described above.

[0117] The controller 22 may include one or more processing cores, such as a quad-core processor or an octa-core processor. The controller 22 may be implemented using at least one hardware form selected from DSP (Digital Signal Processor), FPGA (Field-Programmable Gate Array), and PLA (Programmable Logic Array). The controller 22 may also include a main processor and a coprocessor. The main processor, also known as the central processing unit, is used to process data in the wake-up state; the coprocessor is a low-power processor used to process data in the standby state. In some embodiments, the controller 22 may integrate a GPU (graphics processing unit), which is responsible for rendering and drawing the content to be displayed on the screen. In some embodiments, the controller 22 may also include an AI (Artificial Intelligence) processor, which is used to handle computational operations related to machine learning.

[0118] The memory 21 may include one or more computer-readable storage media, which may be non-transitory. The memory 21 may also include high-speed random access memory and non-volatile memory, such as one or more disk storage devices or flash memory devices. In this embodiment, the memory 21 is used to store at least the following computer program, which, after being loaded and executed by the controller 22, is capable of implementing the relevant steps of the undervoltage protection control method disclosed in any of the foregoing embodiments. In addition, the resources stored in the memory 21 may also include an operating system and data, and the storage method may be temporary or permanent storage. The operating system may include Windows, Unix, Linux, etc. The data may include, but is not limited to, data related to the undervoltage protection control method.

[0119] In some embodiments, the electronic device may further include a display screen, input / output interfaces, communication interfaces, a power supply, and a communication bus.

[0120] It will be understood by those skilled in the art that Figure 6 The structures shown do not constitute a limitation on electronic devices and may include more or fewer components than those shown.

[0121] For an introduction to the electronic device provided by this invention, please refer to the above-described embodiment of the undervoltage protection control method; further details of this invention will not be repeated here.

[0122] To address the aforementioned technical problems, the present invention also provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the steps of the undervoltage protection control method described above.

[0123] It is understood that if the methods in the above embodiments are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and executes all or part of the steps of the methods described in the various embodiments of this application. Specifically, the computer-readable storage medium may include, but is not limited to, any type of disk, including floppy disks, optical disks, and portable hard drives, or any type of media or device suitable for storing instructions or data, etc., and this application does not make any special limitations here.

[0124] For an introduction to the computer-readable storage medium provided by the present invention, please refer to the embodiments of the undervoltage protection control method described above; the present invention will not be repeated here.

[0125] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0126] It should also be noted that, in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0127] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0128] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A control method for undervoltage protection, characterized in that, A controller is applied to an undervoltage protection device, the undervoltage protection device further including a first undervoltage relay and a second undervoltage relay, the coils of the first undervoltage relay and the second undervoltage relay are both connected in parallel across the two ends of a control battery, and one end of the contact of the first undervoltage relay and one end of the contact of the second undervoltage relay are both connected to the input terminal of the controller; the control method includes: Determine the contact operation status of the first undervoltage relay and the contact operation status of the second undervoltage relay, wherein the first voltage setting value corresponding to the first undervoltage relay is different from the second voltage setting value corresponding to the second undervoltage relay; Based on the first voltage setting value, the second voltage setting value, the contact operation of the first undervoltage relay, and the contact operation of the second undervoltage relay, determine whether the first undervoltage relay or the second undervoltage relay is faulty; If so, the current voltage of the control battery is obtained, and based on the current voltage of the control battery, it is determined whether the control battery is undervoltage and the fault status of the first undervoltage relay and the second undervoltage relay. When the first voltage setting value corresponding to the first undervoltage relay is greater than the second voltage setting value corresponding to the second undervoltage relay, the step of determining whether the first undervoltage relay or the second undervoltage relay is faulty based on the first voltage setting value, the second voltage setting value, the contact operation status of the first undervoltage relay, and the contact operation status of the second undervoltage relay includes: If the contacts of the first undervoltage relay do not operate and the contacts of the second undervoltage relay operate, it is determined that either the first undervoltage relay or the second undervoltage relay is faulty. If neither the contact of the first undervoltage relay nor the contact of the second undervoltage relay is activated, it is determined that there is no fault in either the first or second undervoltage relay, and the control battery is not undervoltage. If the contacts of the first undervoltage relay actuate and the contacts of the second undervoltage relay do not actuate, it is determined that neither the first undervoltage relay nor the second undervoltage relay is faulty, and the control battery is not undervoltage, but there is a risk of undervoltage. When both the contacts of the first undervoltage relay and the second undervoltage relay are activated, it is determined that the first or second undervoltage relay is not faulty, and the control battery is undervoltage.

2. The undervoltage protection control method as described in claim 1, characterized in that, When the first voltage setting value corresponding to the first undervoltage relay is greater than the second voltage setting value corresponding to the second undervoltage relay, the step of determining whether the control battery is undervoltage and the fault status of the first and second undervoltage relays based on the current voltage of the control battery includes: Determine whether the current voltage of the control battery is less than a preset voltage value, wherein the preset voltage value is greater than the second voltage setting value corresponding to the second undervoltage relay and less than the first voltage setting value corresponding to the first undervoltage relay; If so, it is determined that the control battery is undervoltage and the first undervoltage relay is faulty; If not, it is determined that the control battery is not undervoltage and the second undervoltage relay is faulty.

3. The undervoltage protection control method as described in claim 2, characterized in that, The undervoltage protection device also includes a notification module, and the control method further includes: When any one or more of the following situations occur: the control battery is undervoltage, the first undervoltage relay malfunctions, and the second undervoltage relay malfunctions, the prompting module is controlled to execute the corresponding prompting strategy.

4. The undervoltage protection control method as described in claim 1, characterized in that, The fixed terminal of the first undervoltage relay contact is connected to the power supply, the first switching terminal is connected to the input terminal of the controller, and the second switching terminal is left floating. The fixed terminal of the second undervoltage relay contact is connected to the power supply, the first switching terminal is connected to the input terminal of the controller, and the second switching terminal is left floating. Determining the contact operation status of the first and second undervoltage relays includes: The contact operation of the first undervoltage relay is determined based on the difference in the level signal before and after the contact switching of the first undervoltage relay. The contact operation of the second undervoltage relay is determined based on the difference in the level signal before and after the contact switching of the second undervoltage relay.

5. The undervoltage protection control method according to any one of claims 1 to 4, characterized in that, The undervoltage protection device further includes a control battery detection system, the input terminal of which is connected to the output terminal of the control battery. Obtaining the current voltage of the control battery includes: Receives an analog signal of the current voltage of the control battery detected by the control battery detection system.

6. The undervoltage protection control method as described in claim 5, characterized in that, The control battery detection system and the controller communicate with each other via a communication bus.

7. A control system for undervoltage protection, characterized in that, A controller for an undervoltage protection device, the undervoltage protection device further comprising a first undervoltage relay and a second undervoltage relay, wherein the coils of the first undervoltage relay and the second undervoltage relay are both connected in parallel across the two ends of a control battery, and one end of the contact of the first undervoltage relay and one end of the contact of the second undervoltage relay are both connected to the input terminal of the controller; the control system includes: The contact operation status determination unit is used to determine the contact operation status of the first undervoltage relay and the contact operation status of the second undervoltage relay, wherein the first voltage setting value corresponding to the first undervoltage relay is different from the second voltage setting value corresponding to the second undervoltage relay. The fault determination unit is used to determine whether the first undervoltage relay or the second undervoltage relay is faulty based on the first voltage setting value, the second voltage setting value, the contact operation status of the first undervoltage relay, and the contact operation status of the second undervoltage relay; if so, it triggers the voltage acquisition unit. The voltage acquisition unit is used to acquire the current voltage of the control battery, and determine whether the control battery is undervoltage and the fault status of the first undervoltage relay and the second undervoltage relay based on the current voltage of the control battery. When the first voltage setting value corresponding to the first undervoltage relay is greater than the second voltage setting value corresponding to the second undervoltage relay, the fault determination unit includes: The first determination unit is used to determine that either the first undervoltage relay or the second undervoltage relay is faulty when the contacts of the first undervoltage relay do not operate and the contacts of the second undervoltage relay operate. The second determination unit is used to determine that if neither the contact of the first undervoltage relay nor the contact of the second undervoltage relay operates, then the first undervoltage relay or the second undervoltage relay is not faulty and the control battery is not undervoltage. The third determination unit is used to determine that if the contacts of the first undervoltage relay are activated and the contacts of the second undervoltage relay are not activated, then the first undervoltage relay or the second undervoltage relay is not faulty, and the control battery is not undervoltage, but there is a risk of undervoltage. The fourth determination unit is used to determine that if both the contacts of the first undervoltage relay and the contacts of the second undervoltage relay are activated, then the first undervoltage relay or the second undervoltage relay is not faulty, and the control battery is undervoltage.

8. An electronic device, characterized in that, include: Memory, used to store computer programs; A controller for implementing the steps of the control method for undervoltage protection as described in any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the steps of the undervoltage protection control method as described in any one of claims 1 to 6.

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