High water temperature fault early warning and power protection method, storage medium and hybrid vehicle

Abstract

The invention relates to a high water temperature fault early warning and power protection method, a storage medium and a hybrid vehicle. The method comprises the steps that multi-source signals of a power system of the vehicle are collected; the multi-source signal comprises a water temperature signal and at least one other signal representing the operation state of the power system except the water temperature signal; when the water temperature signal is larger than the first-level temperature threshold value, heat dissipation intervention is conducted on the power system, and the risk level of the high-water-temperature fault is judged by comparing the intervened water temperature signal with at least one preset higher-level temperature threshold value; fault fusion analysis is carried out based on the multi-source signal, and a high water temperature fault reason is determined; and carrying out high water temperature fault grading early warning according to the determined high water temperature fault reason and the judged risk grade. According to the application, when the water temperature signal is greater than the first-level temperature threshold value, high water temperature fault dynamic risk level judgment and fault fusion analysis based on the multi-source signal are synchronously triggered, so that the accuracy of fault risk level and fault reason judgment is improved, and the problem of relatively high misjudgment risk is solved.

Description

Technical Field

[0001] This application relates to the field of electric vehicle control technology, and in particular to a high water temperature fault early warning and power protection method, a storage medium, and a hybrid vehicle. Background Technology

[0002] The cooling system is a crucial component of the engine and vehicle. During engine operation, the combustion chamber temperature can reach over 2000°C. Failure to cool and dissipate heat promptly can lead to poor combustion, causing combustion knocking, hardware overheating and deformation, and oil deterioration. Currently, protection strategies for high engine coolant temperature faults generally rely on preset fixed temperature thresholds. When the ECM (Engine Control Module) detects that the engine coolant temperature sensor signal exceeds a certain threshold, it triggers tiered alarms and power limiting measures, such as illuminating the malfunction indicator lamp, prompting the driver to stop the vehicle, and limiting engine torque.

[0003] However, this strategy based on a single signal and a fixed threshold has significant drawbacks. For example, it cannot distinguish whether the increase in water temperature is due to a genuine malfunction or sensor signal distortion, leading to a high risk of misjudgment. Once a misjudgment occurs, it can easily result in unnecessary power interruption, affecting driving safety and experience.

[0004] There is currently no effective solution to the problem of high risk of misjudgment under high-temperature fault conditions in related technologies. Summary of the Invention

[0005] Therefore, it is necessary to provide a high water temperature fault warning and power protection method, storage medium, and hybrid vehicle that can accurately determine and warn of high water temperature faults, addressing the aforementioned technical problems.

[0006] Firstly, this embodiment provides a high water temperature fault early warning method, including:

[0007] Collect multi-source signals from the vehicle's power system; the multi-source signals include water temperature signals and at least one other signal besides the water temperature signal that characterizes the operating status of the power system;

[0008] When the water temperature signal is greater than the first-level temperature threshold, heat dissipation intervention is performed on the power system. By comparing the water temperature signal after intervention with at least one preset higher-level temperature threshold, the risk level of the high water temperature fault is determined. Furthermore, fault fusion analysis is performed based on the multi-source signals to determine the cause of the high water temperature fault. The temperature value of the higher-level temperature threshold is higher than the first-level temperature threshold.

[0009] Based on the determined causes of the high water temperature fault and the assessed risk level, a graded early warning system for high water temperature faults is implemented.

[0010] In some embodiments, the step of intervening in the cooling of the power system, and determining the risk level of a high-temperature fault by comparing the water temperature signal after intervention with at least one preset higher-level temperature threshold, includes:

[0011] Cooling intervention is achieved by adjusting the vehicle's water pump speed and / or fan duty cycle;

[0012] If the water temperature signal after intervention is less than or equal to the first-level temperature threshold, the risk level of the high water temperature fault is determined to be mild risk.

[0013] If the water temperature signal after intervention is greater than the secondary temperature threshold, and the water temperature signal after further intervention is less than or equal to the secondary temperature threshold, then the risk level of the high water temperature fault is determined to be medium risk.

[0014] If the water temperature signal after intervention is greater than or equal to the level 3 temperature threshold and reaches the upper limit of intervention, the risk level of the high water temperature fault is determined to be severe risk.

[0015] In some embodiments, before performing fault fusion analysis based on the multi-source signals to determine the cause of the high water temperature fault, the method further includes:

[0016] Based on the multi-source signals, a multi-source analysis model is established in advance.

[0017] In some embodiments, the multi-source signals include: target temperature signal, cooling system status signal, load and environmental signals, and system response signal;

[0018] Based on the aforementioned multi-source signals, a multi-source analysis model is pre-established, including:

[0019] Based on the fluctuation of water temperature signals, a sub-model for verifying the reliability of water temperature signals is established.

[0020] A sub-model for water temperature rise rate is established based on power load, vehicle speed, ambient temperature, and water temperature signals.

[0021] Based on the difference between the target speed and the actual speed of the water pump and fan, a sub-model for cooling cycle failure is established.

[0022] A sub-model for detecting coolant leakage is established based on the level signal from the coolant level sensor inside the expansion tank.

[0023] In some embodiments, the step of performing fault fusion analysis based on the multi-source signals to determine the cause of the high water temperature fault includes:

[0024] Based on the multi-source signals, at least one sub-model in the multi-source analysis model is called according to the preset model calling rules, and the cause of the high water temperature fault is output.

[0025] When the output of the water temperature signal reliability verification sub-model is abnormal, the cause of the high water temperature fault is determined to be a water temperature sensor fault.

[0026] When the outputs of the water temperature rise rate sub-model and the cooling cycle fault sub-model are abnormal, the high water temperature fault is determined to be a cooling cycle fault.

[0027] When the outputs of the water temperature rise rate sub-model and the coolant leakage detection sub-model are abnormal, the cause of the high water temperature fault is determined to be a coolant leakage fault.

[0028] In some embodiments, the step of performing graded early warning for high water temperature faults based on the determined causes of the high water temperature faults and the determined risk levels includes:

[0029] When the risk level is low, control the vehicle to drive normally and issue a cloud-based warning;

[0030] When the risk level is medium or high, the corresponding fault code is triggered according to the cause of the high water temperature fault, and a text reminder is displayed on the vehicle's dashboard.

[0031] Secondly, this embodiment provides a power protection method, including:

[0032] Based on the high water temperature fault early warning method described in the first aspect, the cause and risk level of the high water temperature fault are determined.

[0033] When the risk level is medium or high, the vehicle's power protection is implemented based on the determined cause of the high water temperature failure.

[0034] In some embodiments, when the risk level is moderate or severe, providing power protection to the vehicle based on the determined cause of the high water temperature failure includes:

[0035] If the cause of the high water temperature fault is related to the vehicle's engine, then restrict engine drive, or shut down the engine and switch to electric motor drive;

[0036] If the cause of the high water temperature fault is related to the vehicle's motor, then limit the motor drive, or turn off the motor drive and switch to engine drive;

[0037] If the high water temperature fault is related to both the vehicle's engine and motor, then the motor drive and engine drive will be restricted simultaneously based on the available power of the engine and motor.

[0038] Thirdly, this embodiment provides a hybrid vehicle including an engine and a motor controller. The memory of the engine and motor controller stores a computer program, and at least one processor of the engine and motor controller is configured to run the computer program to execute the high water temperature fault early warning method described in the first aspect and the power protection method described in the second aspect.

[0039] Fourthly, this embodiment provides a storage medium storing a computer program that, when executed by a processor, implements the high water temperature fault early warning method described in the first aspect and the power protection method described in the second aspect.

[0040] Compared with related technologies, the high water temperature fault early warning and power protection method, storage medium, and hybrid vehicle provided in this embodiment collect multi-source signals from the vehicle's power system. These multi-source signals include a water temperature signal and at least one other signal characterizing the power system's operating status. When the water temperature signal exceeds a primary temperature threshold, heat dissipation intervention is performed on the power system. The risk level of the high water temperature fault is determined by comparing the intervened water temperature signal with at least one preset higher-level temperature threshold. Furthermore, fault fusion analysis is performed based on the multi-source signals to determine the cause of the high water temperature fault. The temperature value of the higher-level temperature threshold is higher than the primary temperature threshold. Based on the determined cause of the high water temperature fault and the determined risk level, a graded early warning for the high water temperature fault is provided. In this embodiment, when the water temperature signal exceeds the first-level temperature threshold, the risk level judgment and fault fusion analysis of high water temperature faults are triggered simultaneously. On the one hand, the water temperature signal monitoring after heat dissipation intervention is added to the comparison judgment between the water temperature signal and the set temperature threshold, realizing dynamic judgment of risk level. On the other hand, fault fusion analysis can be performed based on multi-source signals of the vehicle power system, and the cause of high water temperature faults can be determined by comprehensively diagnosing various factors. Finally, the risk level and the cause of high water temperature faults are combined to perform high water temperature fault classification and early warning, which can improve the accuracy of high water temperature fault risk level and fault cause judgment, solve the problem of high misjudgment risk under high temperature fault conditions, and improve driving safety and reliability.

[0041] Details of one or more embodiments of this application are set forth in the following drawings and description to make other features, objects and advantages of this application more readily apparent. Attached Figure Description

[0042] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0043] Figure 1This is a hardware structure block diagram of the terminal of the high water temperature fault early warning method in one embodiment;

[0044] Figure 2 This is a flowchart of a high water temperature fault early warning method in one embodiment;

[0045] Figure 3 This is a schematic diagram of the risk level determination process for a high water temperature fault in one embodiment;

[0046] Figure 4 This is a schematic diagram of the multi-source signal fault fusion analysis process in one embodiment;

[0047] Figure 5 This is a schematic diagram of vehicle power protection control in one embodiment;

[0048] Figure 6 This is a flowchart of a high water temperature fault early warning and power protection method in one embodiment;

[0049] Figure 7 This is a structural block diagram of a high water temperature fault early warning device in one embodiment.

[0050] In the diagram: 102, processor; 104, memory; 106, transmission device; 108, input / output device; 10, signal acquisition module; 20, fault determination module; 30, fault early warning module. Detailed Implementation

[0051] To better understand the purpose, technical solution, and advantages of this application, the application is described and illustrated below in conjunction with the accompanying drawings and embodiments.

[0052] Unless otherwise defined, the technical or scientific terms used in this application shall have the general meaning understood by one of ordinary skill in the art to which this application pertains. Words such as “a,” “an,” “an,” “the,” “the,” and “these” used in this application do not indicate quantitative limitation and may be singular or plural. The terms “comprising,” “including,” “having,” and any variations thereof used in this application are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or device that comprises a series of steps or modules (units) is not limited to the listed steps or modules (units) but may include steps or modules (units) not listed, or may include other steps or modules (units) inherent to these processes, methods, products, or devices. Words such as “connected,” “linked,” and “coupled” used in this application are not limited to physical or mechanical connections but may include electrical connections, whether direct or indirect. “Multiple” used in this application refers to two or more. “And / or” describes the relationship between related objects, indicating that three relationships may exist; for example, “A and / or B” can represent: A alone, A and B simultaneously, and B alone. Normally, the character " / " indicates that the objects before and after it are in an "or" relationship. The terms "first," "second," "third," etc., used in this application are merely to distinguish similar objects and do not represent a specific order of objects.

[0053] The method embodiments provided in this example can be executed on a terminal, computer, or similar computing device. For example, it can run on a terminal. Figure 1 This is a hardware structure block diagram of the terminal for the high water temperature fault early warning method in this embodiment. For example... Figure 1 As shown, a terminal may include one or more ( Figure 1 Only one is shown in the diagram. A processor 102 and a memory 104 for storing data are also included. The processor 102 may be, but is not limited to, a microprocessor (MCU) or a programmable logic device (FPGA). The terminal may also include a transmission device 106 for communication functions and an input / output device 108. Those skilled in the art will understand that… Figure 1 The structure shown is for illustrative purposes only and does not limit the structure of the terminal described above. For example, the terminal may also include components that are larger than... Figure 1 The more or fewer components shown, or having the same Figure 1 The different configurations shown are illustrated.

[0054] The memory 104 can be used to store computer programs, such as application software programs and modules, like the computer program corresponding to the high water temperature fault early warning method in this embodiment. The processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, thereby implementing the above-described method. The memory 104 may include high-speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory 104 may further include memory remotely located relative to the processor 102, and these remote memories can be connected to the terminal via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0055] The transmission device 106 is used to receive or send data via a network. This network includes a wireless network provided by the terminal's communication provider. In one example, the transmission device 106 includes a Network Interface Controller (NIC), which can connect to other network devices via a base station to communicate with the Internet. In another example, the transmission device 106 can be a Radio Frequency (RF) module used for wireless communication with the Internet.

[0056] This embodiment provides a high water temperature fault early warning method. Figure 2 This is a flowchart of the high water temperature fault early warning method in this embodiment, such as... Figure 2 As shown, the method includes the following steps:

[0057] Step S201: Collect multi-source signals from the vehicle's power system; the multi-source signals include at least a water temperature signal and at least one other signal besides the water temperature signal that characterizes the operating status of the power system.

[0058] Specifically, for hybrid vehicles and range-extended vehicles, the vehicle power system is a dual power system driven by an engine and an electric motor. The high water temperature fault early warning method in this embodiment is applicable to both the engine and the electric motor, that is, it collects multi-source signals from the engine and / or the electric motor.

[0059] The following multi-source signals characterizing the powertrain operating status are collected via ECM: target temperature signals (e.g., engine coolant temperature, motor controller temperature, transmission oil temperature, etc.), cooling system status signals (e.g., the difference between the actual and target speeds of the electric water pump, the difference between the actual and target speeds of the cooling fan, coolant level sensor signals, etc.), load and environmental signals (e.g., engine torque / power, motor torque / power, vehicle speed, ambient temperature, etc.), and system response signals (e.g., compared with historical normal data, the current rate of temperature rise and the time required to reach a specific temperature).

[0060] Step S202: When the water temperature signal is greater than the first-level temperature threshold, heat dissipation intervention is performed on the power system. By comparing the water temperature signal after intervention with at least one preset higher-level temperature threshold, the risk level of the high water temperature fault is determined. Furthermore, fault fusion analysis is performed based on multi-source signals to determine the cause of the high water temperature fault. The temperature value of the higher-level temperature threshold is higher than the first-level temperature threshold.

[0061] Specifically, when the water temperature signal exceeds the first-level temperature threshold, risk level determination and fault fusion analysis are triggered simultaneously to obtain the risk level and cause of the high water temperature fault, respectively.

[0062] When the water temperature signal exceeds the first-level temperature threshold, heat dissipation intervention is implemented in the power system (such as increasing the water pump speed or fan duty cycle), and the trend of water temperature signal changes is monitored. By comparing the water temperature signal after intervention with at least one preset higher-level temperature threshold, the risk level of the high water temperature fault is dynamically determined. Specifically, when the water temperature signal reaches a certain temperature threshold, a re-verification process is added, continuously implementing heat dissipation intervention in the power system. If the water temperature signal drops below the threshold after the intervention, it indicates that the temperature remains within a controllable range after active adjustment.

[0063] Temperature thresholds can be set to higher levels than the first-level temperature threshold, such as the second-level temperature threshold and the third-level temperature threshold. The temperature values ​​of higher-level temperature thresholds increase progressively, and the risk levels corresponding to the temperature thresholds are, in order, mild risk, moderate risk, and moderate risk. There is no limit to the specific level or the number of levels.

[0064] When the water temperature signal exceeds the first-level temperature threshold, a fault fusion analysis is triggered based on multi-source signals including the target temperature signal, cooling system status signal, load and environmental signals, and system response signal to determine the cause of the high water temperature fault. The fusion analysis performs one or more of the following diagnostics: water temperature signal reliability verification, system temperature rise rate assessment, or fault location of cooling components (such as water pumps, fans, and coolant). Preferably, several models can be pre-established in the ECM based on the multi-source signals, with each model used to perform one diagnostic, so that the models can be called to perform the diagnostics during the fusion analysis.

[0065] Step S203: Based on the determined cause of the high water temperature fault and the assessed risk level, conduct a graded early warning for the high water temperature fault.

[0066] Specifically, different instrument panel text and / or fault codes are set for graded warnings based on the determined cause of the high water temperature fault. In the low-risk level, the high water temperature fault is within the controllable range and does not affect the normal driving of the vehicle. Only cloud warnings can be triggered for background analysis to avoid excessive warnings affecting driving safety. However, in the medium-risk and above risk levels, warnings of vehicle instrument panel text and / or fault codes need to be issued at the user's front end.

[0067] Through the above steps, when the water temperature signal exceeds the first-level temperature threshold, risk level judgment and fault fusion analysis of high water temperature faults are triggered simultaneously. On the one hand, water temperature signal monitoring after heat dissipation intervention is added to the comparison judgment between the water temperature signal and the set temperature threshold, realizing dynamic judgment of risk level. On the other hand, fault fusion analysis can be performed based on multi-source signals of the vehicle power system to determine the cause of high water temperature faults by comprehensively considering various diagnoses. Finally, a graded early warning of high water temperature faults is given by combining the risk level and the cause of the high water temperature fault. This embodiment has significant improvements over the existing strategy based on a single signal and fixed threshold, which can improve the accuracy of high water temperature fault risk level and fault cause judgment, and reduce false risk judgments and unnecessary power interruptions caused by false risk judgments. In addition, the above method is applied to dual power systems driven by engines and motors. If a power interruption is caused by a high water temperature fault, the power switching of the dual power system can be controlled to protect the vehicle power, further improving driving safety and reliability.

[0068] In some embodiments, step S202 above involves intervening in the cooling of the power system. By comparing the water temperature signal after intervention with at least one preset higher-level temperature threshold, the risk level of a high water temperature fault is determined, including the following steps:

[0069] Cooling intervention is performed by adjusting the vehicle's water pump speed and / or fan duty cycle; if the water temperature signal after several prognoses is less than or equal to the first-level temperature threshold, the risk level of the high water temperature fault is determined to be mild; if the water temperature signal after several prognoses is greater than the second-level temperature threshold, and the water temperature signal after further intervention is less than or equal to the second-level temperature threshold, the risk level of the high water temperature fault is determined to be moderate; if the water temperature signal after several prognoses is greater than or equal to the third-level temperature threshold and reaches the intervention limit, the risk level of the high water temperature fault is determined to be severe.

[0070] Specifically, Figure 3 This is a schematic diagram of the risk level determination process for high water temperature faults in this embodiment, as shown below. Figure 3As shown, the vehicle starts and monitors the water temperature signal. When the water temperature signal is greater than the first-level temperature threshold, the ECM starts the risk level determination strategy and simultaneously triggers fault fusion analysis. In order to reduce false judgments, an observation period can also be added. For example, if the water temperature signal is greater than the first-level temperature threshold for more than the observation period (e.g., 5s), it is considered a valid trigger, and the ECM starts the risk level determination strategy at this time.

[0071] The ECM executes active debugging commands, performing initial heat dissipation intervention by adjusting the water pump speed and / or fan duty cycle. It observes the trend of the water temperature signal (decline or rise) within a certain window. If the water temperature signal shows a sustained decline and eventually stabilizes below or equal to the first-level temperature threshold, the cooling system is performing well and can effectively handle the current heat load. The system is judged to be under instantaneous high load or slightly poor heat dissipation, with low risk, and is classified as mild risk. If the water temperature signal does not decline effectively and rises above the second-level temperature threshold within the window, the ECM immediately initiates enhanced heat dissipation intervention, further increasing the water pump speed and / or fan duty cycle. It observes the trend of the water temperature signal. If the water temperature signal can stabilize at the second-level temperature threshold (below or equal to), it indicates that the cooling system is working at full load and can only barely suppress the rise in water temperature. The system is in a critical state and is classified as moderate risk.

[0072] Even after the ECM implemented enhanced heat dissipation intervention, the upward trend of the water temperature signal was still not contained and continued to rise to (greater than or equal to) the level 3 temperature threshold. If the intervention limit is reached at this point (both the water pump and fan are already working at their maximum allowable parameters), the heat dissipation system has failed or is severely inadequate, and the water temperature cannot be controlled. Mechanical components are at risk of damage and are therefore classified as a severe risk.

[0073] For example, the engine coolant temperature signal can be set to 115℃, 123℃, and 125℃ for each temperature level; and the motor controller coolant temperature signal can be set to 50℃, 65℃, and 80℃ for each temperature level. It should be noted that the temperature threshold settings can also allow for a certain safety margin and fluctuation range.

[0074] In this embodiment, based on the risk level determination by comparing the water temperature signal with the temperature threshold, heat dissipation intervention is performed and the changing trend of the water temperature signal is continuously observed, which enables dynamic risk level determination and reduces misjudgment.

[0075] In some embodiments, before performing fault fusion analysis based on multi-source signals to determine the cause of the high water temperature fault in step S203 above, the following steps are also included:

[0076] A multi-source analysis model is pre-established based on multi-source signals. The multi-source signals include: target temperature signal, cooling system status signal, load and environmental signals, and system response signal.

[0077] This includes the establishment of the following sub-models:

[0078] Based on the fluctuation of water temperature signals, a sub-model for verifying the reliability of water temperature signals is established.

[0079] A sub-model for water temperature rise rate is established based on power load, vehicle speed, ambient temperature, and water temperature signals.

[0080] Based on the difference between the target speed and the actual speed of the water pump and fan, a sub-model for cooling cycle failure is established.

[0081] A sub-model for detecting coolant leakage is established based on the level signal from the coolant level sensor inside the expansion tank.

[0082] Specifically, after performing pre-processing such as signal synchronization and alignment and signal quality preprocessing on the multi-source signals, a multi-source analysis model is pre-established based on the multi-source signals. The multi-source analysis model includes several sub-models, which are used to perform different diagnoses. The causes of high water temperature faults are determined by comprehensively considering all the diagnoses.

[0083] The following are the methods for establishing several sub-models of the multi-source analysis model:

[0084] Based on the fluctuation of the water temperature signal, a sub-model for verifying the reliability of the water temperature signal is established by comparing the reasonable logical relationship between the engine / motor controller water temperature, engine oil temperature, and ambient temperature. This sub-model is used to determine whether the water temperature sensor is distorted or drifting, and to verify whether the water temperature signal is real and reliable.

[0085] Based on the current engine load, vehicle speed, and ambient temperature, the expected normal temperature rise rate is calculated and compared with the actual temperature rise rate to establish a water temperature rise rate sub-model. This sub-model is used to identify whether the system has an abnormal overheating trend and to determine whether the heat dissipation efficiency is normal.

[0086] By comparing the difference between the target speed (control command) and the actual speed (sensor feedback) of the electric water pump and the cooling fan, a cooling cycle fault sub-model is established. This sub-model is used to diagnose the working status of the cooling cycle subsystem (water pump, fan) and determine whether the water pump or fan is stuck, malfunctioning, or experiencing performance degradation.

[0087] By monitoring the liquid level signal of the expansion tank level sensor and identifying abnormal continuous drop in liquid level, a coolant leakage detection sub-model is established. This sub-model is used to determine whether a coolant leakage fault exists.

[0088] In some embodiments, fault fusion analysis is further performed based on the multi-source analysis model established above, with the following steps:

[0089] Based on multi-source signals, at least one sub-model in the multi-source analysis model is invoked according to preset model invocation rules to output the cause of high water temperature fault. Specifically, when the water temperature signal credibility verification sub-model outputs abnormally, the cause of high water temperature fault is determined to be water temperature sensor failure; when the water temperature rise rate sub-model and cooling cycle fault sub-model output abnormally, the cause of high water temperature fault is determined to be cooling cycle failure; when the water temperature rise rate sub-model and coolant leakage detection sub-model output abnormally, the cause of high water temperature fault is determined to be coolant leakage fault.

[0090] Specifically, the preset model invocation rules include the selection and invocation order of each sub-model in the multi-source analysis model. At least one sub-model in the multi-source analysis model is invoked according to the preset rules to output the cause of the high water temperature fault. For example, to ensure a comprehensive diagnosis of the cause of the high water temperature fault, all sub-models are executed sequentially according to the model invocation rules for various diagnoses. Alternatively, to improve diagnostic efficiency, the water temperature signal reliability verification sub-model is forcibly executed according to the model invocation rules. After diagnosing a water temperature sensor fault, subsequent sub-models can be skipped, and the cause of the high water temperature fault can be directly output.

[0091] Figure 4 This is a schematic diagram of the multi-source signal fault fusion analysis process in this embodiment, as shown below. Figure 4 As shown, taking the sequential execution of four sub-models as an example, the vehicle starts and monitors the water temperature signal. When the water temperature signal is greater than the first-level temperature threshold, the ECM integrates multi-source signals to perform fault fusion analysis and sequentially executes the water temperature signal reliability verification sub-model, water temperature rise rate sub-model, coolant leakage detection sub-model, and cooling cycle fault sub-model.

[0092] In the water temperature signal reliability verification sub-model, if the water temperature signal fluctuation rate is greater than the preset threshold (e.g., 50℃) within the observation period (e.g., 15s), the output is abnormal, and it is determined to be a water temperature sensor failure. The water temperature rise rate sub-model is then executed, and the reference value for each operating condition is determined based on the historical data model. If the temperature rise rate is 0.1℃ / s under the operating condition of vehicle idling and ambient temperature of -20℃, and the temperature rise rate is significantly greater than the reference value for this operating condition, it is judged to be a heat load failure, the output is abnormal, and further execution of subsequent sub-models is required for comprehensive judgment.

[0093] If, in the subsequent coolant leak detection sub-model, the coolant level signal is lower than the preset threshold, it indicates that the vehicle is short of coolant, and this is identified as a coolant leak fault. If, in the subsequent cooling cycle fault sub-model, the difference between the actual speed of the water pump or fan and the target speed is less than the preset speed (e.g., 300 rpm), it indicates that the water pump / fan speed tracking is abnormal, and this is identified as a cooling cycle fault.

[0094] In this embodiment, a multi-source analysis model is pre-established based on multi-source signals. The multi-source analysis model includes several sub-models. By calling each sub-model, it is more convenient to perform various diagnoses in the fault fusion analysis, so as to comprehensively determine the cause of the high water temperature fault by integrating various diagnoses.

[0095] In some embodiments, the high water temperature fault classification and early warning in step S203 above, based on the determined fault cause and the assessed risk level, includes the following steps:

[0096] When the risk level is mild, the vehicle will be controlled to drive normally and a cloud-based warning will be issued; when the risk level is moderate or severe, the corresponding fault code will be triggered according to the cause of the high water temperature fault, and a text reminder will be displayed on the vehicle's dashboard.

[0097] Specifically, different instrument text and / or fault codes are set for graded warnings based on the determined cause of the high water temperature fault. When the risk level is mild, after adjusting the water pump / fan duty cycle through ECM, the temperature rise rate and water temperature sensor signal reach the expected value, the high water temperature fault is within the controllable range and does not affect the normal driving of the vehicle. Only cloud warnings can be triggered for background analysis to avoid excessive warnings affecting driving safety. When the risk level is moderate or severe, instrument text and / or fault code warnings need to be issued at the user's front end.

[0098] This embodiment provides a power protection method. After determining the cause and risk level of the high water temperature fault based on the high water temperature fault early warning method in the above embodiments, when the risk level is medium risk or severe risk, the vehicle power protection is performed according to the determined cause of the high water temperature fault, including the following steps:

[0099] If the high coolant temperature fault is related to the vehicle's engine, then restrict engine drive or shut down the engine and switch to electric motor drive; if the high coolant temperature fault is related to the vehicle's electric motor, then restrict electric motor drive or shut down the electric motor drive and switch to engine drive; if the high coolant temperature fault is related to both the vehicle's engine and electric motor, then restrict both electric motor drive and engine drive simultaneously, depending on the available power of the engine and electric motor.

[0100] Specifically, Figure 5 This is a control diagram of the vehicle power protection in this embodiment, as shown below. Figure 5 As shown, after the vehicle starts, the vehicle's power protection is triggered based on the risk level. When the risk level is low, after adjusting the water pump / fan duty cycle through the ECM, the temperature rise rate and water temperature signal reach the expected values. The high water temperature fault is within a controllable range and does not affect the normal operation of the vehicle. Only a cloud-based warning can be triggered for background analysis without limiting power output, and only forward-looking thermal management can be performed.

[0101] When the risk level is moderate or severe, the water temperature signal continues to rise, reaching the level 2 and 3 temperature thresholds, respectively. The water temperature signal cannot be reduced through heat dissipation interference. Simultaneously, the ECM performs multi-source fusion judgment and controls the actual / target speed of the water pump / fan for failure verification, identifying the correlation between the high water temperature fault and the engine or electric drive system (motor controller), and switching or matching the power source control accordingly. If the high water temperature fault is strongly related to the engine, engine drive is restricted, and the engine is shut down and switched to motor drive when a serious fault is diagnosed by the sub-model. If the high water temperature fault is related to the motor, motor drive is restricted, and the motor drive is shut down and switched to engine drive when a serious fault is diagnosed by the sub-model. If the high water temperature fault is related to both the engine and the motor, both motor and engine drive are restricted based on the available power of the engine and motor. By reducing engine load and based on battery charge or discharge power limitations, a very low available power (such as a "limp-down" mode) is maintained to ensure only the minimum vehicle mobility, and a warning and rescue alert are issued.

[0102] Furthermore, to mitigate the risk of high water temperature due to occasional failures—such as the water pump intermittently stalling or stopping due to uncleanliness of the cooling system, or the radiator experiencing occasional decreases in heat dissipation capacity due to foreign objects like willow catkins—the ECM can be configured for periodic diagnostic checks. When the fault is resolved, the vehicle returns to normal driving operation.

[0103] In this embodiment, based on the risk level and cause of high water temperature faults with higher accuracy, the power dual backup function of the hybrid system is activated to protect the vehicle's power, ensuring that the vehicle can maintain a minimum safe driving power and improving the vehicle's reliability and safety.

[0104] The present embodiment will now be described and illustrated through preferred embodiments.

[0105] Figure 6 This is a flowchart of the high water temperature fault early warning and power protection method in this embodiment, such as... Figure 6 As shown, the method includes the following steps:

[0106] Step S601: Collect multi-source signals from the vehicle's power system; the multi-source signals include target temperature signal, cooling system status signal, load and environmental signals, and system response signal.

[0107] Step S602: When the water temperature signal is greater than the first-level temperature threshold, heat dissipation intervention is performed by adjusting the vehicle water pump speed and / or fan duty cycle; if the water temperature signal after several prognoses is less than or equal to the first-level temperature threshold, it is determined to be a mild risk; if the water temperature signal after several prognoses is greater than the second-level temperature threshold, and the water temperature signal after further intervention is less than or equal to the second-level temperature threshold, it is determined to be a moderate risk; if the water temperature signal after several prognoses is greater than or equal to the third-level temperature threshold and reaches the intervention limit, it is determined to be a severe risk.

[0108] The temperature values ​​of the first-level temperature threshold, the second-level temperature threshold, and the third-level temperature threshold increase progressively.

[0109] Step S603: When the water temperature signal is greater than the first-level temperature threshold, based on the multi-source signal, at least one sub-model in the preset multi-source analysis model is called according to the preset model calling rules, and the cause of the high water temperature fault is output; wherein, when the water temperature signal credibility verification sub-model outputs abnormally, it is determined to be a water temperature sensor fault; when the water temperature rise rate sub-model and the cooling cycle fault sub-model output abnormally, it is determined to be a cooling cycle fault; when the water temperature rise rate sub-model and the coolant leakage detection sub-model output abnormally, it is determined to be a coolant leakage fault.

[0110] Step S604: When the risk level is mild, control the vehicle to drive normally and issue a cloud-based warning; when the risk level is moderate or severe, perform vehicle power protection based on the correlation between the high water temperature fault and the engine / motor, trigger the corresponding fault code, and display a text reminder on the vehicle's dashboard.

[0111] It should be noted that the steps shown in the above process or the flowchart in the accompanying figures can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here. For example, steps S602 and S603 are triggered synchronously when the water temperature signal exceeds a first-level temperature threshold, without specifying a particular order of execution.

[0112] This embodiment also provides a high water temperature fault early warning device, which is used to implement the above embodiments and preferred embodiments, and will not be repeated as described above. The terms "module," "unit," "subunit," etc., used below can refer to a combination of software and / or hardware that performs a predetermined function. Although the device described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0113] Figure 7 This is a structural block diagram of the high water temperature fault early warning device in this embodiment, as shown below. Figure 7 As shown, the device includes:

[0114] The signal acquisition module 10 is used to acquire multi-source signals of the vehicle's power system; the multi-source signals include water temperature signal and at least one other signal besides water temperature signal that characterizes the operating status of the power system;

[0115] The fault determination module 20 is used to intervene in the heat dissipation of the power system when the water temperature signal is greater than the first-level temperature threshold. By comparing the water temperature signal after intervention with at least one preset higher-level temperature threshold, the risk level of the high water temperature fault is determined. The module also performs fault fusion analysis based on multi-source signals to determine the cause of the high water temperature fault. The temperature value of the higher-level temperature threshold is higher than the first-level temperature threshold.

[0116] The fault warning module 30 is used to provide graded warnings for high water temperature faults based on the determined causes and risk levels.

[0117] The device provided in this embodiment synchronously triggers risk level judgment and fault fusion analysis for high water temperature faults when the water temperature signal exceeds a first-level temperature threshold. On one hand, it incorporates water temperature signal monitoring after heat dissipation intervention into the comparison between the water temperature signal and the set temperature threshold, achieving dynamic risk level determination. On the other hand, it can perform fault fusion analysis based on multi-source signals from the vehicle's power system, comprehensively determining the cause of the high water temperature fault through various diagnostics. Finally, it provides a graded early warning for high water temperature faults by combining the risk level and the cause. This embodiment represents a significant improvement over existing strategies based on a single signal and fixed thresholds, enhancing the accuracy of high water temperature fault risk level and cause judgment, reducing false risk assessments, and improving driving safety and reliability.

[0118] It should be noted that the above modules can be functional modules or program modules, and can be implemented through software or hardware. For modules implemented through hardware, the above modules can reside in the same processor; or the above modules can be located in different processors in any combination.

[0119] This embodiment provides a hybrid vehicle including an engine and a motor controller. The memory of the engine and the motor controller stores a computer program, and at least one processor of the engine and the motor controller is configured to run the computer program to perform the steps in any of the above method embodiments.

[0120] It should be noted that the specific examples in this embodiment can refer to the examples described in the above embodiments and optional implementations, and will not be repeated in this embodiment.

[0121] Furthermore, in conjunction with the high water temperature fault warning and power protection methods provided in the above embodiments, this embodiment can also provide a storage medium for implementation. The storage medium stores a computer program; when executed by a processor, the computer program implements any one of the high water temperature fault warning and power protection methods in the above embodiments.

[0122] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, data stored, data displayed, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties.

[0123] It should be understood that the specific embodiments described herein are merely illustrative of the application and not intended to limit it. All other embodiments derived by those skilled in the art based on the embodiments provided in this application without inventive effort are within the scope of protection of this application.

[0124] Obviously, the accompanying drawings are merely some examples or embodiments of this application. Those skilled in the art can apply this application to other similar situations based on these drawings without any creative effort. Furthermore, it is understood that although the work done in this development process may be complex and lengthy, for those skilled in the art, certain design, manufacturing, or production modifications made based on the technical content disclosed in this application are merely conventional technical means and should not be considered as insufficient disclosure of this application.

[0125] The term "embodiment" in this application refers to a specific feature, structure, or characteristic described in connection with an embodiment that may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily imply the same embodiment, nor does it imply that it is mutually exclusive with or alternative to other embodiments. It will be clearly or implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments without conflict.

[0126] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of patent protection. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the appended claims.

Claims

1. A high water temperature failure early warning method, characterized by, The method comprises: collecting multi-source signals of a power system of a vehicle; the multi-source signals comprise a water temperature signal and other signals representing the running state of the power system other than the water temperature signal; when the water temperature signal is greater than a first temperature threshold, performing a heat dissipation intervention on the power system, and determining the risk level of a high water temperature fault by comparing the water temperature signal after the intervention with at least one higher temperature threshold; and performing fault fusion analysis based on the multi-source signals to determine the cause of the high water temperature fault; the temperature value of the higher temperature threshold is higher than that of the first temperature threshold; based on the determined cause of the high water temperature fault and the determined risk level, performing a high water temperature fault grading early warning.

2. The high water temperature failure early warning method of claim 1, wherein, The heat dissipation intervention on the power system and the determination of the risk level of the high water temperature fault by comparing the water temperature signal after the intervention with at least one higher temperature threshold comprise: performing a heat dissipation intervention by adjusting the water pump speed and / or fan duty cycle of the vehicle; if the water temperature signal after the intervention is less than or equal to the first temperature threshold, it is determined that the risk level of the high water temperature fault is mild; if the water temperature signal after the intervention is greater than a second temperature threshold, and the water temperature signal after continued intervention is less than or equal to the second temperature threshold, it is determined that the risk level of the high water temperature fault is moderate; if the water temperature signal after the intervention is greater than or equal to a third temperature threshold and reaches an intervention upper limit, it is determined that the risk level of the high water temperature fault is severe.

3. The high water temperature failure early warning method of claim 1, wherein Before the fault fusion analysis based on the multi-source signals to determine the cause of the high water temperature fault, the method further comprises: pre-establishing a multi-source analysis model based on the multi-source signals.

4. The high water temperature failure early warning method of claim 3, wherein, The multi-source signals comprise a target temperature signal, a cooling system state signal, a load and environment signal, and a system response signal; pre-establishing a multi-source analysis model based on the multi-source signals comprises: establishing a water temperature signal credibility verification sub-model based on the fluctuation of the water temperature signal; establishing a water temperature rise rate sub-model based on the power load, vehicle speed, ambient temperature, and water temperature signal; establishing a cooling circulation fault sub-model based on the difference between the target speed and the actual speed of the water pump and the fan; establishing a cooling liquid leakage detection sub-model based on the liquid level signal of the liquid level sensor in the expansion water tank.

5. The high water temperature failure early warning method of claim 4, wherein, The fault fusion analysis based on the multi-source signals to determine the cause of the high water temperature fault comprises: based on the multi-source signals, at least one sub-model in the multi-source analysis model is called according to a preset model calling rule, and the cause of the high water temperature fault is output; when the water temperature signal credibility verification sub-model outputs an exception, it is determined that the cause of the high water temperature fault is a water temperature sensor fault; when the water temperature rise rate sub-model and the cooling circulation fault sub-model output an exception, it is determined that the high water temperature fault is a cooling circulation fault; when the water temperature rise rate sub-model and the cooling liquid leakage detection sub-model output an exception, it is determined that the cause of the high water temperature fault is a cooling liquid leakage fault.

6. The high water temperature failure early warning method of claim 2, wherein, The high water temperature fault grading early warning based on the determined cause of the high water temperature fault and the determined risk level comprises: When the risk level is a mild risk, the vehicle is controlled to run normally and a cloud warning is given; When the risk level is a moderate risk and a severe risk, a corresponding fault code is triggered according to the high-temperature fault cause, and a Chinese language reminder is given on the instrument panel of the vehicle.

7. A method of power protection, characterized by, The method comprises: The high-temperature fault warning method according to any one of claims 1 to 6 is used to determine the high-temperature fault cause and the risk level; When the risk level is a moderate risk and a severe risk, power protection is performed on the vehicle according to the determined high-temperature fault cause.

8. The power protection method of claim 7, wherein, When the risk level is a moderate risk and a severe risk, power protection is performed on the vehicle according to the determined high-temperature fault cause. If the high-temperature fault cause is related to the engine of the vehicle, the engine drive is limited, or the engine is turned off and switched to motor drive; If the high-temperature fault cause is related to the motor of the vehicle, the motor drive is limited, or the motor drive is turned off and switched to engine drive; If the high-temperature fault cause is related to both the engine and the motor of the vehicle, the motor drive and the engine drive are limited according to the available power of the engine and the motor.

9. A hybrid vehicle comprising an engine and a motor controller, characterized by, The memory of the engine and motor controller stores a computer program, and at least one processor of the engine and motor controller is configured to execute the computer program to perform the high-temperature fault warning method of any one of claims 1 to 6 and the power protection method of any one of claims 7 to 8.

10. A computer-readable storage medium having stored thereon a computer program, characterized in that, The computer program, when executed by a processor, implements the steps of the high-temperature fault warning method of any one of claims 1 to 6 and the power protection method of any one of claims 7 to 8.

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