Engine coolant protection methods, devices and storage media

Abstract

This disclosure provides an engine coolant shortage protection method, device, and storage medium, relating to the field of engine control technology. The method includes: monitoring the engine's current actual speed after engine start-up; identifying the target speed range of the engine based on the actual speed, wherein different speed ranges are matched with independent coolant pressure fault diagnosis strategies; running the coolant pressure fault diagnosis strategy matched to the target speed range to determine whether a coolant pressure fault has occurred in the cooling system based on multi-dimensional operating parameters of the cooling system; and when a coolant pressure fault occurs in the cooling system, issuing a first fault message characterizing the coolant pressure as below standard and performing torque limiting protection on the engine. This method performs refined diagnosis of coolant pressure faults under different operating conditions based on the coolant pressure fault diagnosis strategy adapted to the engine speed range, effectively identifying coolant pressure faults and promptly implementing torque limiting protection.

Description

Technical Field

[0001] This disclosure belongs to the field of engine control technology, specifically relating to an engine coolant protection method, device, and storage medium. Background Technology

[0002] The engine's cooling system is used to ensure the engine operates normally. When the expansion tank in the engine's cooling system is severely low on water during vehicle operation, or when leaks occur in components such as the expansion tank cap, EGR cooler, or cooling water lines, causing the cooling system to lose pressure, the temperature of the coolant inside the engine will rise sharply. This can lead to serious quality failures such as dry burning of the EGR cooler, cracks in the valve bridge area under the cylinder head, or cracks around the spark plug bores, severely affecting the engine's lifespan and operational safety.

[0003] In related technologies, traditional engine coolant protection methods are based on recognizing coolant levels in the expansion tank. This type of method can only mechanically identify the amount of water in the expansion tank and cannot detect engine coolant pressure failures (also known as low coolant pressure failures) or overfilling of coolant, thus leading to these abnormal operating conditions being missed.

[0004] In related technologies, some engine coolant protection methods use a combination of parameters based on water temperature and water jacket pressure to identify coolant shortage. However, this type of method only identifies water pressure after the water temperature exceeds the limit. When the cooling system experiences localized boiling but the overall water temperature has not yet reached the preset threshold, it cannot identify engine coolant shortage. Furthermore, due to fluctuations in water pressure, this method frequently produces false alarms in actual use. Summary of the Invention

[0005] This disclosure provides an engine coolant protection method, device, and storage medium, aiming to at least partially solve the technical problem that the inability to effectively identify coolant pressure faults leads to poor engine coolant protection, affecting engine life and operational safety.

[0006] At least one embodiment of this disclosure provides an engine coolant protection method, applied to an engine with a cooling system, comprising:

[0007] After the engine is started, monitor the current actual speed of the engine; The target speed range of the engine is identified based on the actual speed. The target speed range is one of a plurality of preset speed ranges, and different speed ranges are matched with independent coolant pressure fault diagnosis strategies. Run a coolant pressure fault diagnosis strategy matched to the target speed range to determine whether a coolant pressure fault has occurred in the cooling system based on the current multi-dimensional operating parameters of the cooling system; and, When a coolant pressure failure occurs in the cooling system, a first fault message is issued to indicate that the coolant pressure of the cooling system is below standard, and torque limiting protection is provided for the engine.

[0008] The above solution offers the following technical advantages: Addressing the technical problem that related technologies often fail to effectively identify coolant pressure faults, leading to inadequate engine coolant protection and impacting engine lifespan and operational safety, this method proposes an engine coolant protection approach based on different coolant pressure fault diagnosis strategies operating across multiple engine speed ranges. This method fully considers the impact of engine speed on diagnostic accuracy. It activates an adapted coolant pressure fault diagnosis strategy based on the engine's real-time actual speed to diagnose coolant pressure faults in the cooling system, achieving differentiated diagnosis across different regions. Furthermore, since a failure to maintain pressure even without coolant shortage will cause at least one abnormality in the cooling system's multi-dimensional operating parameters, this method further refines the diagnosis of coolant pressure faults based on the real-time multi-dimensional operating parameters of the cooling system. This method can identify engine coolant pressure faults immediately when the engine experiences severe coolant shortage or failure to maintain pressure, reporting the first fault information characteristic of the coolant pressure fault. This alerts the driver to promptly check the cooling system and implements corresponding torque limiting protection to prevent major engine quality failures.

[0009] In at least one embodiment of the method provided in this disclosure, the cooling system includes an expansion tank, and the method further includes: When a vehicle using the engine is powered on, the current actual liquid level in the expansion tank is obtained; Determine whether the actual liquid level is lower than the preset lower mark of the expansion tank; If so, a second fault message is issued to indicate that the expansion tank level is below the standard, prompting the addition of coolant to the expansion tank after the vehicle is powered off; and, If not, after performing the action of clearing the second fault information, start the engine.

[0010] The above solution has the following technical effects: it enables pre-power-on checks, detects low coolant levels in the expansion tank before engine start, and reminds the driver to add coolant after power-off, but does not impose torque limitations to ensure that the vehicle can start normally and move short distances.

[0011] In the method provided in at least one embodiment of this disclosure, the plurality of rotational speed ranges include: A first speed range is identified when the actual speed is lower than a preset first speed threshold. The second speed range is identified by the actual speed falling between the first speed threshold and a preset second speed threshold; and, The third speed range is identified by the actual speed being higher than the second speed threshold. Wherein, the first speed threshold is less than the second speed threshold.

[0012] The above solution has the following technical effect: enabling differentiated diagnosis by region.

[0013] In at least one embodiment of the method provided in this disclosure, at least one coolant pressure fault diagnosis strategy matching a speed range is configured as follows: Obtain the current multidimensional operating parameters of the cooling system; Determine whether the multidimensional operating parameters meet the combined diagnostic conditions used to diagnose and eliminate interference in the current cooling system coolant pressure fault; and, If so, it is determined that the cooling system is currently experiencing a coolant pressure failure.

[0014] The above solution has the following technical effects: improving diagnostic accuracy and reliability.

[0015] In at least one embodiment of the method provided in this disclosure, the cooling system includes a water pump, the multi-dimensional operating parameters include water pump inlet pressure, water pump outlet pressure, and engine coolant temperature, and the step of determining whether the multi-dimensional operating parameters meet the combined diagnostic conditions for diagnosing a current coolant pressure fault in the cooling system and eliminating interference includes: The first diagnostic logic is initiated, wherein the first diagnostic logic is used to verify whether the current water pump inlet pressure and the coolant temperature meet preset first combined diagnostic conditions to determine whether the cooling system is currently experiencing a coolant pressure fault. The first combined diagnostic conditions include the water pump inlet pressure being less than zero, the coolant temperature being greater than a preset first set temperature, and a first duration during which the water pump inlet pressure is less than zero and the coolant temperature is greater than the first set temperature being greater than a preset first fault reporting time. The second diagnostic logic is activated. The second diagnostic logic is used to verify whether the current water pump outlet pressure and the coolant temperature meet the preset second combination diagnostic conditions to determine whether the cooling system is currently experiencing a coolant pressure fault. The second combination diagnostic conditions include the water pump outlet pressure being less than the preset first set pressure, the coolant temperature being greater than the preset first set temperature, and a second duration that simultaneously satisfies the condition that the water pump outlet pressure is less than the first set pressure and the coolant temperature is greater than the first set temperature being greater than the preset second fault reporting time.

[0016] The above solution offers the following technical advantages: Building upon traditional engine coolant shortage protection methods, it adds water pump inlet and outlet pressures as diagnostic criteria. These pressures allow for precise diagnosis of various abnormal scenarios, such as insufficient or absent engine pressure maintenance, fundamentally preventing major quality issues caused by cooling system problems, such as cracks in the valve bridge area under the cylinder head, around the spark plug bores, and dry burning of the EGR cooler. Furthermore, this solution employs a collaborative diagnostic approach based on water pump inlet / outlet pressure and a multi-speed range dynamic coolant pressure fault diagnosis strategy. This allows for accurate identification of engine coolant pressure faults. When the engine experiences severe coolant shortage or absence of pressure maintenance, the solution immediately identifies and reports the fault, alerting the driver to promptly investigate and resolve the cooling system issue.

[0017] In the method provided in at least one embodiment of this disclosure, the first diagnostic logic is configured as follows: Determine whether the current water pump inlet pressure is less than zero; When the water pump inlet pressure is less than zero, determine whether the current coolant temperature is greater than a preset first set temperature; When the coolant temperature is greater than the first set temperature, timing begins to obtain the first duration through continuous timing; Determine whether the first duration is greater than the preset first fault reporting time; If the first duration is greater than the first fault reporting time, it is determined that the cooling system is currently experiencing a coolant pressure fault; and, When the timer ends and the first duration is less than the first fault reporting time, the first duration is reset to zero to prevent false alarms of the coolant pressure fault.

[0018] The above solution has the following technical effects: first, the water pump inlet pressure is determined, then the coolant temperature is determined, and finally, a coolant pressure fault is determined based on the first duration. This can prevent false alarms and effectively avoid engine overheating.

[0019] In the method provided in at least one embodiment of this disclosure, the combined diagnostic conditions used by the coolant pressure fault diagnosis strategies matched for different speed ranges are different, and the first path diagnostic logic and the second path diagnostic logic of the same coolant pressure fault diagnosis strategy are executed in parallel. Furthermore, the second path diagnostic logic is configured as follows: Determine whether the current water pump outlet pressure is less than a preset first set pressure; When the water pump outlet pressure is less than the first set pressure, it is determined whether the current coolant temperature is greater than the preset first set temperature. When the coolant temperature is greater than the first set temperature, timing begins to obtain the second duration through continuous timing; Determine whether the second duration is greater than the preset second fault reporting time; When the second duration is greater than the second fault reporting time, it is determined that the cooling system is currently experiencing a coolant pressure fault; and, When the timing ends and the second duration is less than the second fault reporting time, the second duration is reset to zero to prevent false alarms of the coolant pressure fault.

[0020] The above solution offers the following technical advantages: it first determines the water pump outlet pressure, then the coolant temperature, and finally makes a coolant pressure fault judgment based on a second time duration. This prevents false alarms and effectively avoids engine overheating. Furthermore, it simultaneously diagnoses and protects based on both water pump inlet and outlet pressure logic, achieving double insurance. This ensures that any abnormalities in the engine cooling system are detected, diagnosed, and protected immediately, preventing major quality faults such as EGR cooler dry burning or cracks on the cylinder head underside.

[0021] In at least one embodiment of the method provided in this disclosure, the torque limiting protection of the engine includes: Determine a target torque limiting mode that matches the current engine speed range, wherein the target torque limiting mode is one of several preset torque limiting modes of different levels, and different speed ranges are matched with different levels of torque limiting modes; and, The engine is controlled to operate in the target torque-limiting mode to prevent damage to the engine due to coolant pressure failure.

[0022] The above solution has the following technical effects: it can perform different levels of torque limiting actions to protect the engine in a timely manner under different engine operating conditions and avoid major engine quality failures.

[0023] At least one embodiment of this disclosure also provides an engine coolant protection device, applied to an engine with a cooling system, comprising: The sensing module is configured to monitor the current actual speed of the engine after the engine is started; The first-level processing module is configured to identify the target speed range of the engine based on the actual speed. The target speed range is one of a plurality of preset speed ranges, and different speed ranges are matched with independent coolant pressure fault diagnosis strategies. The second-level processing module is configured to run a coolant pressure fault diagnosis strategy matched to the target speed range to determine whether a coolant pressure fault has occurred in the cooling system based on the current multi-dimensional operating parameters of the cooling system; and, The execution module is configured to issue a first fault message indicating that the coolant pressure of the cooling system is below standard when a coolant pressure failure occurs in the cooling system, and to perform torque limiting protection on the engine.

[0024] At least one embodiment of this disclosure also provides a storage medium storing a program or instructions, wherein the program or instructions, when executed by a processor, implement the steps of the method provided in any embodiment of this disclosure.

[0025] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of an example cooling system in an engine; Figure 2 A flowchart of an engine coolant protection method provided for at least one embodiment of this disclosure; Figure 3 A schematic diagram of a speed range division scheme provided in at least one embodiment of this disclosure; Figure 4 A flowchart illustrating a coolant pressure fault diagnosis strategy provided in at least one embodiment of this disclosure; Figure 5 Example flowchart of a dual-path redundancy diagnostic strategy provided in at least one embodiment of this disclosure; Figure 6 A flowchart illustrating a torque limiting protection scheme provided in at least one embodiment of this disclosure; Figure 7 Flowchart of another engine coolant protection method provided for at least one embodiment of this disclosure; Figure 8 Example flowchart of an engine coolant protection method provided in at least one embodiment of this disclosure; Figure 9 A structural block diagram of an engine coolant protection device provided in at least one embodiment of this disclosure; Figure 10 Example structural block diagram of an engine coolant protection device provided in at least one embodiment of this disclosure; Figure 11 A structural block diagram of a program product provided for at least one embodiment of this disclosure.

[0028] Figure label: 1- Expansion tank; 2- Water pump inlet pipe; 3- Water pump; 4- Water pump outlet pipe; 5- Oil cooler; 6- EGR cooler; 7- Engine block water chamber; 8- Cylinder head water chamber; 9- Thermostat chamber; 10- Hydraulic retarder; 11- Thermostat; 12- Radiator; 13- Turbocharger; 14- Heater; 15- Air compressor; 16- ECU; 100- Engine coolant protection device; 101- Sensing module; 102- First-level processing module; 103- Second-level processing module; 104- Execution module; 104a- Fault reporting submodule; 104b- Protection execution submodule; 201- Processor; 202- Memory; 203- Input device; 204- Output device; n - Rotational speed; L 1- Liquid level; L min - Lower marking on the expansion tank; P i - Water pump inlet pressure; P o - Water pump outlet pressure; T c - Engine coolant temperature; T 标定转速 - First set temperature; T 标定故障报出 - Fault reporting time; T i累计计时器 - First duration; T o累计计时器 - Second duration; P o标定转速 - First set pressure. Detailed Implementation

[0029] The present disclosure will now be described in further detail with reference to the accompanying drawings and embodiments. It should be particularly noted that the following embodiments are for illustrative purposes only and do not limit the scope of the disclosure. Similarly, the following embodiments are only some, not all, embodiments of the present disclosure, and all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this disclosure.

[0030] The terms "first," "second," and "third" used in the embodiments of this disclosure are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first," "second," and "third" may explicitly or implicitly include at least one of that feature.

[0031] In the description of this disclosure, "multiple" means at least two, such as two or three, unless otherwise expressly and specifically limited.

[0032] In this disclosure, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0033] The terms “comprising” and “having”, and any variations thereof, used in this disclosure are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or components inherent to such processes, methods, products, or devices.

[0034] The term "cooling system" in this disclosure, also known as a coolant circulation system, generally includes core components such as an expansion tank, a water pump, various sensors, and water pipes connecting the various components.

[0035] The term "expansion tank" in this disclosure, also known as an expansion vessel, refers to a closed-loop liquid circulation system. As a key auxiliary device of the engine, its core functions are to accommodate the volume changes caused by thermal expansion and contraction of the medium, maintain constant pressure, exhaust gas and replenish water, and prevent overpressure / negative pressure and cavitation in the pipeline.

[0036] The term "exhaust gas recirculation system" (EGR) used in this disclosure refers to a key technical component in an engine emission control system. Its core function is to introduce a portion of the exhaust gas emitted after engine combustion into the intake manifold, mix it with fresh air or a mixture, and then re-enter the cylinder to participate in combustion.

[0037] The term "EGR cooler dry burning" in this disclosure refers to the phenomenon that the engine EGR cooler continues to emit high-temperature exhaust gas even though no coolant is flowing through it. This is a very typical fault in heavy vehicles, construction machinery, and trucks.

[0038] The term "coolant pressure failure" in this disclosure, also known as low coolant pressure failure, refers to an abnormal state in which the pressure of the coolant in the cooling system is continuously lower than a preset normal threshold. As one of the common failure types in the operation of the engine cooling system, its core manifestation is insufficient coolant circulation power, which cannot efficiently remove the heat generated by the engine operation, and may lead to serious consequences such as engine block overheating and EGR cooler dry burning.

[0039] The term "expansion tank level failure" in this disclosure, also known as a low expansion tank level failure, refers to an abnormal state in which the coolant level in the expansion tank is continuously below a preset lower limit of normal. When this failure occurs, the cooling system will not receive sufficient coolant replenishment, resulting in a reduction in the total amount of circulating coolant. This may lead to a drop in coolant pressure, reduced engine cooling efficiency, or even serious failures such as dry burning of the EGR cooler.

[0040] The term "coolant pressure failure" in this disclosure embodiment, also known as pressure failure, includes both full water pressure failure and excessive water pressure failure. This failure results in insufficient coolant circulation power, which in turn affects the engine's heat dissipation effect and may even lead to serious failures such as EGR cooler dry burning.

[0041] The term "engine controller" in this disclosure is abbreviated as ECU.

[0042] The technical approach involved in this disclosure will be briefly described below.

[0043] Figure 1 This is a schematic diagram illustrating an example of a cooling system in an engine. Figure 1As shown, the cooling system includes an expansion tank 1, a water pump inlet pipe 2, a water pump 3, a water pump outlet pipe 4, an oil cooler 5, an EGR cooler 6, an engine block water chamber 7, a cylinder head water chamber 8, a thermostat chamber 9, a hydraulic retarder 10, a thermostat 11, a radiator 12, and a turbocharger 13. The expansion tank 1 is connected to the inlet of the water pump 3 via the water pump inlet pipe 2. The outlet of the water pump 3 is connected sequentially to the oil cooler 5, engine block water chamber 7, cylinder head water chamber 8, thermostat chamber 9, hydraulic retarder 10, and the input of the thermostat 11 via the water pump outlet pipe 4. The first output of the thermostat is connected in parallel with the outlet of the heater core 14 and the outlet of the air compressor 15, and then connected to the water pump inlet pipe 2. The second output of the thermostat is connected in parallel with the outlet of the heater core 14 and the outlet of the air compressor 15 via the radiator 12, and then connected to the water pump inlet pipe 2. The outlet of the thermostat chamber 9 is connected to the inlet of the heater core 14. One end of the body water chamber 7 is connected to the inlet of the air compressor 15. One end of the oil cooler 5 is connected to the water pump inlet pipe 2 via the EGR cooler 6, and the other end of the oil cooler 5 is connected to the inlet of the thermostat chamber 9 via the booster 13. This forms a complete coolant circulation loop, ensuring that the coolant flows orderly among the components to achieve the heat dissipation function.

[0044] To address the technical problem that related technologies fail to effectively identify coolant pressure faults, resulting in inadequate engine coolant protection and impacting engine lifespan and operational safety, this disclosure proposes an engine coolant protection method based on different coolant pressure fault diagnosis strategies operating across multiple engine speed ranges. This method fully considers the influence of engine speed on diagnostic accuracy, activating an adapted coolant pressure fault diagnosis strategy based on the engine's real-time actual speed to diagnose coolant pressure faults in the cooling system, achieving differentiated diagnosis across different regions. Furthermore, since a fault where there is no coolant shortage but no pressure maintenance will cause at least one abnormality in the multi-dimensional operating parameters of the cooling system, this method further refines the diagnosis of coolant pressure faults based on the real-time multi-dimensional operating parameters of the cooling system. This method can identify engine coolant pressure faults immediately when the engine experiences severe coolant shortage or no pressure maintenance, reporting the first fault information characterizing the coolant pressure fault, reminding the driver to promptly check the cooling system, and implementing corresponding torque limiting protection to prevent major engine quality failures.

[0045] Based on the test results, it is shown that a full water supply without pressure maintenance will cause negative pressure in the water pump inlet, leading to abnormal conditions in the engine cooling system. This disclosed method utilizes a collaborative diagnostic strategy combining water pump inlet and outlet pressure data collected by dual pressure sensors with dynamic calibration across multiple speed ranges. By integrating water pressure data with traditional level monitoring, it accurately identifies both insufficient water supply and insufficient pressure maintenance in the engine cooling system. Combined with graded torque limiting protection, this method can completely prevent major engine quality failures.

[0046] Based on this, the disclosed method employs the same coolant pressure fault diagnosis strategy across the first, second, and third speed ranges arranged from low to high. The difference lies in the specific calibration values ​​of the diagnostic parameters, which are designed for differentiated diagnosis across different regions. Upon meeting the fault reporting conditions, a coolant pressure fault is reported, and a first, second, and third torque-limiting mode are executed according to the target speed range. Different torque-limiting modes have different torque-limiting amplitudes.

[0047] Based on this, the method and system disclosed herein can be applied to diesel engines, natural gas engines, methanol engines, and hydrogen fuel cell engines. By dynamically calibrating diagnostic parameters across different speed ranges, the method can accurately adapt to the operating characteristics of cooling systems in various engine types, effectively identifying abnormalities such as insufficient water or excessive water pressure under different operating conditions. Combined with a graded torque limiting protection strategy, it can provide targeted cooling system fault warnings and protection measures for various engines, reducing the risk of damage to core engine components due to cooling system failures, and significantly improving the safety, stability, and service life of engine operation.

[0048] Figure 2 This is a flowchart illustrating an engine coolant shortage protection method according to at least one embodiment of the present disclosure. The method can be applied to engines with a cooling system in which coolant circulates. Figure 2 As shown, the method may include the following steps S10-S40.

[0049] Step S10: After the engine is started, monitor the current actual speed of the engine.

[0050] Step S20: Identify the target speed range of the engine based on the actual speed. The target speed range is one of multiple preset speed ranges, and different speed ranges are matched with independent coolant pressure fault diagnosis strategies.

[0051] Step S30: Run a coolant pressure fault diagnosis strategy that matches the target speed range to determine whether a coolant pressure fault has occurred in the cooling system based on the current multi-dimensional operating parameters of the cooling system.

[0052] Step S40: When a coolant pressure failure occurs in the cooling system, a first fault message is issued to indicate that the coolant pressure in the cooling system is not up to standard, and torque limiting protection is applied to the engine.

[0053] It should be noted that the specific speed range of different speed ranges in step S20 can be flexibly set according to actual application requirements.

[0054] In the above scheme, this disclosure does not limit the speed monitoring scheme in step S10. In practical applications, speed monitoring can be achieved by directly acquiring the pulse signals output by the crankshaft position sensor or camshaft position sensor through the engine controller ECU. By analyzing the frequency of the pulse signals, the engine controller ECU can calculate the actual engine speed in real time, which can meet the real-time requirements of speed parameters for fault diagnosis. Alternatively, an external speed detection device can be connected to the engine signal interface to obtain speed data, which is suitable for system scenarios requiring additional verification or modification. When the system executes step S10, it can select a suitable speed monitoring scheme according to the vehicle type and its application scenario.

[0055] In the above scheme, this disclosure does not limit the speed range division scheme in step S20. In practical application scenarios, in addition to the schemes described in the following embodiments, the division can also be tailored according to the differences in engine type. For example, for gasoline engines, the speed range can be divided into idle speed range, low speed range, medium speed range, and high speed range. In addition, it can be dynamically adjusted according to the specific application scenario of the vehicle. For example, for heavy-duty trucks, the range of medium and high speed range can be appropriately widened to adapt to their operating requirements under heavy load. For passenger cars, the division accuracy of idle speed and low speed range can be optimized to improve the fault diagnosis sensitivity during daily commuting. When the system executes step S20, it can select a suitable speed range division scheme according to the accuracy and real-time requirements of fault diagnosis to adapt to different vehicles and different application scenarios.

[0056] In the above scheme, this disclosure does not limit the coolant pressure fault diagnosis strategy in step 30. In practical application scenarios, in addition to the schemes described in the following embodiments, customized designs can be made according to the differences in engine type. For example, for diesel engines, due to their high operating pressure and large heat load, a diagnostic strategy based on dynamic adjustment of pressure threshold can be adopted, triggering a warning when the coolant pressure is lower than the preset dynamic threshold. For gasoline engines, joint diagnosis can be performed by combining temperature sensor data, and the accuracy of fault identification can be improved by analyzing the correlation between pressure and temperature. In addition, the diagnostic logic can be optimized according to the specific application scenario of the vehicle: for engineering vehicles that operate in high-temperature environments for a long time, the judgment condition of the duration of abnormal pressure can be added to avoid false alarms caused by short-term fluctuations; for new energy hybrid vehicles, the frequent start-stop characteristics of the engine need to be considered, and the threshold range of pressure diagnosis should be appropriately relaxed during the start-up phase, and the standard detection should be restored after the operating conditions stabilize. When the system executes step 30, it can select an appropriate coolant pressure fault diagnosis strategy according to the reliability requirements of fault diagnosis and hardware configuration to ensure effective application in different vehicles and scenarios.

[0057] In the above scheme, this disclosure does not limit the torque limiting protection scheme in step 40. In practical application scenarios, in addition to the schemes described in the following embodiments, the triggering conditions and intensity of torque limiting can be flexibly adjusted according to the engine type and operating conditions. For example, for diesel engines, a graded torque limiting strategy can be adopted. When the coolant pressure remains below the dynamic threshold for a certain period of time, a slight torque limiting is triggered first to reduce the engine load. If the pressure still does not recover, the torque limiting intensity is gradually increased to avoid affecting the vehicle's operational stability due to sudden and significant torque limiting. For gasoline engines, the timing of torque limiting can be determined by combining the coordinated changes in coolant temperature and pressure. When the temperature exceeds the safety threshold and the pressure is abnormal, torque limiting protection is activated to prevent engine overheating and damage. For engineering vehicles that operate at high temperatures for extended periods, a temperature-pressure joint judgment logic can be added. Torque limiting is only executed when both conditions simultaneously meet the abnormal conditions and remain for a preset duration, reducing unnecessary power restrictions. For new energy hybrid vehicles, the torque limiting trigger can be temporarily delayed at the initial stage of engine startup. The standard torque limiting rule is then activated after the coolant circulation stabilizes, balancing startup performance and protection effects. When the system executes step 30, it can flexibly select a verified torque limiting protection scheme according to the actual needs of different vehicles to improve the practicality and reliability of the water shortage protection system.

[0058] Some embodiments of this disclosure also provide systems, storage media, and program products corresponding to the methods described above.

[0059] The method provided in at least one embodiment of this disclosure is applicable to any existing vehicle application scenario requiring water shortage protection for the engine cooling system. For example, in traditional gasoline-powered passenger vehicles, the cooling system uses a water pump to circulate coolant to remove heat from the engine block. When the vehicle idles or drives at low speeds for extended periods in high-temperature environments, the coolant evaporation rate accelerates, easily leading to water shortage risks. The method of this disclosure can monitor multi-dimensional parameters such as coolant level, temperature, and water pump speed in real time, dynamically adjust the analysis strategy, and trigger alarms or protection actions in a timely manner. Hybrid electric vehicles' cooling systems must simultaneously meet the heat dissipation needs of both the engine and the electric motor, resulting in complex and variable operating conditions. The method of this disclosure can select a combined collaborative analysis scheme based on the parameter characteristics under different operating conditions to accurately identify potential water shortage hazards caused by system switching or sudden load changes. Heavy commercial trucks often travel in long-distance transportation scenarios with harsh road conditions, and their cooling systems are prone to leakage due to bumps and aging pipes. The method of this disclosure can be combined with a cluster analysis prediction scheme to analyze historical leakage data and real-time operating parameters, providing early warnings of potential water shortage faults and ensuring driving safety.

[0060] Figure 3 This is a schematic diagram illustrating a speed range division scheme provided in at least one embodiment of this disclosure. Figure 2 Based on the existing plan, in order to improve the sensitivity and accuracy of diagnosis, such as... Figure 3As shown, the multiple speed ranges in step S20 are divided into a first speed range (also called the low speed range), a second speed range (also called the intermediate speed range), and a third speed range (also called the high speed range), or further divided according to actual needs. The first speed range is identified by the actual speed being lower than a preset first speed threshold. The second speed range is identified by the actual speed being between the first speed threshold and a preset second speed threshold. The third speed range is identified by the actual speed being higher than the second speed threshold. The first speed threshold is lower than the second speed threshold. This speed range division scheme allows for the setting of appropriate diagnostic thresholds to address the differences in the operating characteristics of the cooling system under different speed ranges. This refined diagnostic strategy effectively overcomes the limitations of traditional single-threshold diagnostic methods, further improving the response speed and judgment accuracy of engine coolant protection, and providing more reliable safety assurance for vehicles under different operating conditions.

[0061] As an exemplary implementation, the first speed range can be set as follows: n ≤1200r / min, the second speed range is such as 1200r / min < n <2000r / min and the third speed range are n ≥2000r / min, where, n This indicates the actual rotational speed. The first speed range represents low speed, the second speed range represents medium speed, and the third speed range represents high speed.

[0062] Figure 4 This is a flowchart illustrating a coolant pressure fault diagnosis strategy provided in at least one embodiment of the present disclosure. This coolant pressure fault diagnosis strategy can be applied to any one of a first speed range, a second speed range, or a third speed range. Figure 2 or Figure 3 Based on the existing plan, in order to improve diagnostic accuracy and reliability, such as Figure 4 As shown, the coolant pressure fault diagnosis strategy in at least one speed range in step S30 further includes the following sub-steps S301-S303.

[0063] Sub-step S301: Obtain the current multi-dimensional operating parameters of the cooling system.

[0064] Sub-step S302: Determine whether the multi-dimensional operating parameters meet the combined diagnostic conditions used to diagnose the current coolant pressure fault in the cooling system and eliminate interference.

[0065] Sub-step S303: If yes, determine that the cooling system is currently experiencing a coolant pressure failure.

[0066] Specifically, sub-steps S301-S303 accurately locate coolant pressure faults in the cooling system across different engine speed ranges, effectively avoiding false alarms or missed alarms caused by judging a single parameter. This method of dynamically adjusting diagnostic conditions in intervals ensures diagnostic accuracy and improves the system's adaptability under complex operating conditions, providing a more reliable fault warning basis for engine coolant protection and ensuring that subsequent protection measures are triggered in a timely and accurate manner.

[0067] In some embodiments, Figure 4 Based on the proposed solution, the coolant pressure fault diagnosis strategy for each speed range includes sub-steps S301-S303. However, the combined diagnostic conditions used in the coolant pressure fault diagnosis strategies for different speed ranges differ. Specifically, the engine load level, coolant circulation flow requirements, and system dynamic response characteristics vary significantly across different speed ranges. Therefore, the combined diagnostic conditions need to be specifically set according to the operating characteristics of each range. This differentiated setting of combined diagnostic conditions better reflects the cooling system's operating patterns under different engine operating conditions, further improving the accuracy and reliability of fault diagnosis.

[0068] Figure 5 A flowchart illustrating an example of a dual-path redundancy diagnostic strategy provided in at least one embodiment of this disclosure. Figure 4 Based on the proposed solution, the cooling system includes a water pump and an expansion tank. Multi-dimensional operating parameters include water pump inlet pressure, water pump outlet pressure, and engine coolant temperature. Furthermore, such as... Figure 5 As shown, sub-step S302 further includes the following sub-steps S302' and S302''.

[0069] Sub-step S302': Start the first diagnostic logic, wherein the first diagnostic logic is used to verify whether the current water pump inlet pressure and coolant temperature meet the preset first combination diagnostic conditions, so as to determine whether the cooling system is currently experiencing a coolant pressure fault. The first combination diagnostic conditions include water pump inlet pressure less than zero, coolant temperature greater than a preset first set temperature, and a first duration that simultaneously satisfies water pump inlet pressure less than zero and coolant temperature greater than the first set temperature greater than a preset first fault reporting time.

[0070] Sub-step S302'': Start the second diagnostic logic, wherein the second diagnostic logic is used to verify whether the current water pump outlet pressure and coolant temperature meet the preset second combination diagnostic conditions, so as to determine whether the cooling system is currently experiencing a coolant pressure fault. The second combination diagnostic conditions include water pump outlet pressure being less than a preset first set pressure, coolant temperature being greater than a preset first set temperature, and a second duration that simultaneously satisfies water pump outlet pressure being less than the first set pressure and coolant temperature being greater than the first set temperature being greater than a preset second fault reporting time.

[0071] The coolant pressure fault diagnosis strategies for different engine speed ranges employ different first set temperatures, first fault reporting times, first set pressures, and second fault reporting times. Through parallel execution of dual-path diagnostic logic in sub-steps S302a and S302b, if either diagnostic logic determines a coolant pressure fault in the cooling system, a coolant pressure fault signal is immediately triggered. Combined with the engine's current engine speed range, the corresponding preset protection strategy is invoked to provide accurate data support for subsequent maintenance. This dual-path redundant diagnosis and hierarchical protection mechanism effectively improves the accuracy and timeliness of cooling system fault diagnosis, minimizing the risk of engine damage due to coolant shortage or abnormal pressure.

[0072] The above solution, based on traditional engine coolant shortage protection methods, adds water pump inlet and outlet pressures as diagnostic criteria. By utilizing these pressures, it can precisely diagnose various abnormal scenarios, such as insufficient or absent engine pressure maintenance, fundamentally preventing major quality defects caused by cooling system problems, such as cracks in the valve bridge area under the cylinder head, around the spark plug bores, and dry burning of the EGR cooler. Furthermore, employing a collaborative diagnostic approach based on water pump inlet / outlet pressure and a multi-speed range dynamic coolant pressure fault diagnosis strategy, it can accurately identify engine coolant pressure faults. When the engine experiences severe coolant shortage or absence of pressure maintenance, the fault is identified and reported immediately, alerting the driver to promptly investigate and resolve the cooling system problem.

[0073] In some embodiments, Figure 5 Based on the existing plan, to improve the effectiveness of preventing false alarms, a minimum number of [unclear] can be set. MThe minimum acceptable water volume without affecting engine reliability is used to set the water pump's outlet pressure under this condition as the first set pressure. Specific conditions vary between different engines. The first set temperature can be differentiated by engine speed, such as setting the first speed range to 50℃, the second speed range to 60℃, and the third speed range to 70℃. The first fault reporting time and the second fault reporting time can be equal, without distinguishing between speed ranges; all speeds can use a single limit, such as setting it to 5 seconds, meaning a fault will only be reported if the time exceeds 5 seconds after the fault reporting condition, preventing false alarms. Alternatively, it can be flexibly set according to actual conditions. Longer first and second fault reporting times result in better false alarm prevention, but it's also important to ensure timely reporting of actual faults; this needs to be determined based on the specific vehicle.

[0074] In some embodiments, Figure 5 Based on the scheme, in order to improve the diagnostic effect, the first path diagnostic logic of sub-step S302' is configured to include the following sub-steps S302a'-S302f'.

[0075] Sub-step S302a': Determine whether the current water pump inlet pressure is less than zero.

[0076] Sub-step S302b': When the water pump inlet pressure is less than zero, determine whether the current coolant temperature is greater than the preset first set temperature.

[0077] Sub-step S302c': When the coolant temperature is greater than the first set temperature, start timing to obtain the first duration through continuous timing.

[0078] Sub-step S302d': Determine whether the first duration is greater than the preset first fault reporting time.

[0079] Sub-step S302e': When the first duration is greater than the first fault reporting time, it is determined that a coolant pressure fault has occurred in the cooling system.

[0080] Sub-step S302f': When the timing ends and the first duration is less than the first fault reporting time, the first duration is reset to zero to prevent false alarms of coolant pressure faults.

[0081] It should be noted that under normal conditions of sufficient water and pressure maintenance, the water pump inlet pressure is positive. However, if there is a severe water shortage or no pressure maintenance at all, the water pump inlet pressure will become negative, thus satisfying the condition of sub-step S302b'. The first set temperature can be flexibly set according to the actual vehicle conditions, such as setting it to 100℃. The first duration obtained in sub-step S302c' must be continuously timed; otherwise, a zeroing action will be performed to prevent false alarms. The first fault reporting time can be flexibly set according to actual needs, such as setting it to 5 seconds.

[0082] Specifically, sub-steps S302a'-S302f' enable precise and dynamic monitoring of abnormal coolant pressure in the cooling system. This logic combines multi-layered conditional judgments with timing control. It first uses a water pump inlet pressure below zero as the initial trigger condition, then further filters potential fault scenarios based on whether the coolant temperature exceeds a first set temperature. Subsequently, it continuously verifies the persistence of the abnormal state through timing, ensuring that a fault is only determined when the abnormal state persists beyond the first fault reporting time. Simultaneously, it resets the timing before reaching the threshold, effectively avoiding misjudgments caused by instantaneous fluctuations or occasional interference. This diagnostic logic design provides a more detailed and reliable monitoring dimension for engine coolant protection.

[0083] The above solution first determines the water pump inlet pressure, then the coolant temperature, and finally makes a coolant pressure fault judgment based on the first duration. This can prevent false alarms and effectively avoid engine overheating.

[0084] In some embodiments, Figure 5 Based on the scheme, in order to improve the diagnostic effect, the second diagnostic logic in sub-step S302'' is configured to include the following sub-steps S302a''-S302f''.

[0085] Sub-step S302a'': Determine whether the current water pump outlet pressure is less than the preset first set pressure.

[0086] Sub-step S302b'': When the water pump outlet pressure is less than the first set pressure, determine whether the current coolant temperature is greater than the preset first set temperature.

[0087] Sub-step S302c'': When the coolant temperature is greater than the first set temperature, start timing to obtain the second duration through continuous timing.

[0088] Sub-step S302d'': Determine whether the second duration is greater than the preset second fault reporting time.

[0089] Sub-step S302e'': When the second duration is greater than the second fault reporting time, it is determined that a coolant pressure fault has occurred in the cooling system.

[0090] Sub-step S302f'': When the timing ends and the second duration is less than the second fault reporting time, the second duration is reset to zero to prevent false alarms of coolant pressure faults.

[0091] It should be noted that the first set pressure needs to be accurately calibrated based on normal test data of the water pump outlet pressure at various speeds on the test bench, with a certain margin allowed. The first set temperature can be flexibly set according to the actual situation of the vehicle, such as setting it to 100℃. The second duration obtained in sub-step S302c'' needs to be continuously timed; otherwise, a zeroing action will be performed to prevent false alarms. The second fault reporting time can be flexibly set according to actual needs, such as setting it to 5 seconds.

[0092] Specifically, sub-steps S302a''-S302f'' enable accurate monitoring and fault diagnosis of abnormal coolant pressure in the cooling system. By combining the dual conditions of water pump outlet pressure and coolant temperature to trigger timing, and determining whether to report a coolant pressure fault based on whether the second duration exceeds a preset threshold, the timing is reset in time if it does not reach the threshold, effectively avoiding false alarms caused by short-term fluctuations and ensuring the accuracy and reliability of the engine coolant protection mechanism.

[0093] The above solution first determines the water pump outlet pressure, then the coolant temperature, and finally makes a coolant pressure fault judgment based on the second duration. This can prevent false alarms and effectively avoid engine overheating.

[0094] In some embodiments, Figure 5 Based on the proposed solution, the first and second diagnostic logics are executed in parallel. This parallel processing significantly shortens the response time for fault identification, allowing for rapid triggering of warnings or protective actions when a potential water shortage risk first appears, further improving the timeliness of engine water shortage protection. Cross-validation of the two diagnostic results effectively reduces the probability of misjudgments caused by short-term fluctuations in a single parameter, ensuring the accuracy of fault diagnosis and providing a double safety barrier for stable engine operation. Simultaneously, the logic based on both water pump inlet and outlet pressure provides diagnosis and protection, achieving double insurance. This ensures that any abnormalities in the engine cooling system are detected, diagnosed, and protected immediately, preventing major quality failures such as EGR cooler dry burning or cracks on the cylinder head underside.

[0095] Figure 6 A flowchart illustrating a torque-limiting protection scheme provided in at least one embodiment of this disclosure. Figures 2-5 Based on any one of the solutions, in order to improve the torque limiting protection effect, such as Figure 6 As shown, the torque limiting protection scheme in step S40 further includes the following sub-steps S401-S402.

[0096] Sub-step S401: Determine the target torque limiting mode that matches the current engine speed range. The target torque limiting mode is one of several preset torque limiting modes of different levels. Different speed ranges are matched with different levels of torque limiting modes.

[0097] Sub-step S402: Control the engine to operate in the target torque-limiting mode to avoid engine damage due to coolant pressure failure.

[0098] The dynamic adaptation of torque limiting protection is achieved through sub-steps S401-S402. The appropriate torque limiting mode is selected based on the engine's real-time speed range. This ensures effective reduction of engine load to prevent damage in the event of coolant pressure failure, while avoiding over-protection or under-protection issues that might arise from a single torque limiting strategy. For example, when the engine is in the high-speed range, a higher-level torque limiting mode is used to quickly reduce output power and alleviate coolant circulation pressure; while in the low-speed range, a lower-level torque limiting mode is used to maintain the engine's basic operating requirements as much as possible while ensuring safety. This differentiated torque limiting scheme based on speed range further enhances the targeting and flexibility of coolant shortage protection, enabling the engine to receive precise and appropriate protection under various operating conditions, providing more comprehensive assurance for its stable and reliable operation.

[0099] The above solution provides different levels of torque limiting action to protect the engine under different operating conditions, thus preventing major engine quality failures.

[0100] As an exemplary implementation, multiple torque limiting modes of different levels include a first torque limiting mode, a second torque limiting mode, and a third torque limiting mode. The first torque limiting mode is executed in the first speed range, the second torque limiting mode is executed in the second speed range, and the third torque limiting mode is executed in the third speed range. The torque limiting mode of each torque limiting mode can be set as appropriate according to the actual situation, such as limiting the torque by 30% in the first torque limiting mode, 40% in the second torque limiting mode, and 50% in the third torque limiting mode.

[0101] Figure 7 A flowchart illustrating another engine coolant protection method provided for at least one embodiment of this disclosure. Figures 2-6 Based on any of the proposed solutions, the cooling system includes an expansion tank, and, as... Figure 7 As shown, the method further includes the following steps S01-S04: Step S01: When the vehicle with the engine is powered on, obtain the current actual liquid level in the expansion tank.

[0102] Step S02: Determine whether the actual liquid level is lower than the preset lower mark of the expansion tank.

[0103] Step S03: If yes, issue a second fault message to indicate that the expansion tank level is not up to standard, prompting that coolant be added to the expansion tank after the vehicle is powered off.

[0104] Step S04: If not, after performing the action of clearing the second fault information, start the engine.

[0105] The pre-detection process, from steps S01 to S04, enables power-on pre-detection, detecting low coolant levels in the expansion tank before engine start-up. This alerts the driver to add coolant after power-off, but torque limiting is not implemented to ensure normal vehicle start-up and short-distance movement. This method effectively assesses coolant reserves before engine start-up, preventing coolant shortage risks at their source. This pre-warning mechanism, combined with the subsequent dynamic torque limiting strategy based on engine speed range, forms a multi-layered protection loop of prevention and intervention. The former proactively avoids the risk of starting without coolant through level detection, while the latter dynamically adjusts protection intensity based on real-time operating conditions. Their synergistic effect further enhances the comprehensiveness and reliability of engine coolant shortage protection. Simultaneously, this pre-detection process provides initial state information for subsequent fault diagnosis and protection measure execution, ensuring accurate decision-making from the start-up stage and helping the engine maintain stable operation throughout its lifecycle.

[0106] In the above scheme, when starting the vehicle, step S01 involves inserting the car key into the vehicle and then rotating it clockwise to the first position. At this time, the vehicle begins the power-on process. After power-on, step S0-1 and step S04 are executed first to determine whether the expansion tank level is lower than the preset lower mark of the expansion tank. After step S04 eliminates the problem of insufficient water in the cooling system, the engine is started.

[0107] In some embodiments, Figure 7 Based on the proposed solution, the second fault information issued in step S03 includes, but is not limited to, the expansion tank level fault code (also known as the low expansion tank level fault code). Performing the action of clearing the second fault information is equivalent to clearing the expansion tank level fault code once. This clearing mechanism ensures the timeliness and accuracy of the fault information, further enhancing the dynamic response capability of the water shortage protection method.

[0108] Figure 8 An example flowchart of an engine coolant protection method provided for at least one embodiment of this disclosure. Figure 8 As shown, the method includes: 1) When the vehicle is powered on, the engine control unit (ECU) monitors the current coolant level L1 via the expansion tank level sensor and determines the current coolant level. L 1. Is it below the lower mark of the expansion tank? L min ,like L 1 <L min If the engine fails to reach the expansion tank level, a fault will be reported, but torque will not be limited. The driver will be reminded to add coolant to the expansion tank after the vehicle is powered off. Otherwise, the expansion tank level will be automatically reset once, and then the engine will be started. 2) After the engine starts, the engine controller ECU monitors the engine's current actual speed in real time. n According to the rotation speed n To determine the vehicle's operating condition, specifically whether it is operating in the low-speed range (e.g., n ≤1200r / min), intermediate speed range (e.g., 1200r / min < n <2000r / min), or in the high-speed range (such as n ≥2000r / min); 3) When the engine speed n When the engine is in the second RPM range, the engine control unit (ECU) monitors the water pump inlet pressure in real time. P i Water pump outlet pressure P o Engine coolant temperature T c (Ye Heng's outlet water temperature), and simultaneously perform diagnosis on two separate paths, 4) and 5); 4) First diagnostic logic: First, determine whether the water pump inlet pressure is met. P i If <0, then continue to determine the coolant temperature. T c Is it greater than the first set temperature? T 标定转速 ,like T c > T 标定转速 Then the first duration T i累计计时器 Start accumulating time and determine... T i累计计时器 Is it greater than the fault reporting time? T 标定故障报出 ,like T i累计计时器 > T 标定故障报出 If the low coolant pressure fault is detected, the second torque limiting mode will be activated. 5) Second diagnostic logic: First, determine whether the water pump outlet pressure is met. P o < P o标定转速 , P o标定转速This indicates the initial set pressure; if so, the coolant temperature will be determined. T c Is it greater than the first set temperature? T 标定转速 ,like T c > T 标定转速 Then the second duration T o累计计时器 Start accumulating time and determine... T o累计计时器 Is it greater than the fault reporting time? T 标定故障报出 ,like T o累计计时器 > T 标定故障报出 If the low coolant pressure fault is detected, the system will lock and report the fault, and execute the second torque limiting mode.

[0109] The first diagnostic logic is based on the water pump inlet pressure P. i and coolant temperature T c The second diagnostic logic is based on the water pump outlet pressure P. o and coolant temperature T c The coolant pressure fault diagnosis strategy for the first and third speed ranges is the same as that for the second speed range, except that the first set pressure is different. P o标定转速 and T 标定转速 The specific calibration values ​​are different to achieve differentiated diagnosis by region. After the fault reporting conditions are met, a low coolant pressure fault is reported, and the first torque limiting mode or the third torque limiting mode is executed respectively.

[0110] Figure 9 This is a structural block diagram of an engine coolant protection device provided for at least one embodiment of the present disclosure. This system can be applied to engines with cooling systems. Figure 9 As shown, the engine coolant protection device 100 integrates a sensing module 101, a first-level processing module 102, a second-level processing module 103, and an execution module 104.

[0111] The sensing module 101 is configured to monitor the current actual speed of the engine after the engine is started.

[0112] The first-level processing module 102 is configured to identify the target speed range of the engine based on the actual speed. The target speed range is one of a number of preset speed ranges, and different speed ranges are matched with independent coolant pressure fault diagnosis strategies.

[0113] The second-level processing module 103 is configured to run a coolant pressure fault diagnosis strategy that matches the target speed range, in order to determine whether the cooling system has experienced a coolant pressure fault based on the current multi-dimensional operating parameters of the cooling system.

[0114] The execution module 104 is configured to issue a first fault message indicating that the coolant pressure of the cooling system is not up to standard when a coolant pressure failure occurs in the cooling system, and to perform torque limiting protection on the engine.

[0115] The specific execution methods of each unit in the above system embodiments have been described in detail in the embodiments related to the method, and will not be elaborated here.

[0116] In some embodiments, Figure 9 Based on the scheme, the sensing module 101 can be implemented by a corresponding sensor, and the first-level processing module 102, the second-level processing module 103 and the execution module 104 can be implemented by a controller with corresponding programs.

[0117] Figure 10 An example structural block diagram of an engine coolant protection device provided in at least one embodiment of this disclosure. Figure 9 Based on the plan, Figure 9 Based on the plan, such as Figure 10 As shown, the execution module 104 further includes a fault reporting submodule 104a and a protection execution submodule 104b. The fault reporting submodule 104a is configured to issue a first fault message indicating that the coolant pressure in the cooling system is below standard when a coolant pressure fault occurs in the cooling system. The protection execution submodule 104b is configured to perform torque limiting protection on the engine when a coolant pressure fault occurs in the cooling system.

[0118] The sensing module 101 includes an expansion tank level sensor, a water pump inlet pressure sensor, a water pump outlet pressure sensor, and a coolant temperature sensor. Figure 10 (Not shown in the image). An expansion tank level sensor is located inside the expansion tank's level detection area to monitor the current level in real time. A water pump inlet pressure sensor is installed at the water pump inlet to monitor the inlet pressure in real time. A water pump outlet pressure sensor is installed at the water pump outlet to monitor the outlet pressure in real time. A coolant temperature sensor is located on the branch of the water pump outlet pipe to collect real-time coolant temperature data, assisting in more accurately matching the coolant pressure fault diagnosis strategy to the current engine thermal load. These sensors work together to provide the system with comprehensive cooling system operating data, ensuring the accuracy and timeliness of fault diagnosis.

[0119] The first-level processing module 102 and the second-level processing module 103 are integrated into the engine controller ECU, so that the core configuration of the engine coolant protection device 100 includes: engine controller ECU, fault reporting submodule, protection execution submodule, expansion tank level sensor, water pump inlet pressure sensor and water pump outlet pressure sensor, etc.

[0120] The above solution adds water pump inlet and outlet pressure sensors to the traditional expansion tank level sensor. By using the water pump inlet and outlet pressure sensors, it can accurately diagnose various abnormal scenarios such as insufficient water pressure or failure to maintain pressure in the engine. This can fundamentally prevent major quality failures caused by cooling system problems, such as cracks in the valve bridge area under the cylinder head, around the spark plug bore, or dry burning of the EGR cooler.

[0121] This disclosure also provides a storage medium storing a program or instructions that, when executed by a processor, implement the steps of the method embodiments described above.

[0122] This disclosure also provides a program product, such as... Figure 11 As shown, the program product includes one or more processors 201 and memory 202. Figure 11 Take a processor 201 as an example.

[0123] The controller may also include an input device 203 and an output device 204.

[0124] The processor 201, memory 202, input device 203, and output device 204 can be connected via a bus or other means. Figure 11 Taking the example of a connection between China and Israel via a bus.

[0125] Processor 201 can be a central processing unit (CPU), or it can be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or combinations of the above types of chips. The general-purpose processor can be a microprocessor or any conventional processor.

[0126] The memory 202, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs, non-transitory computer-executable programs, and modules, such as the program instructions / modules corresponding to the methods in the embodiments of this disclosure. The processor 201 executes various functional applications and data processing of the server by running the non-transitory software programs, instructions, and modules stored in the memory 202, thereby implementing the steps of the above-described method embodiments.

[0127] The memory 202 may include a program storage area and a data storage area. The program storage area may store the operating system and applications required for at least one function; the data storage area may store data created by the use of the processing device operated by the server. Furthermore, the memory 202 may include high-speed random access memory and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some embodiments, the memory 202 may optionally include memory remotely located relative to the processor 201, and these remote memories can be connected to a network connection device via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

[0128] Input device 203 can receive input digital or character information, and generate key signal inputs related to driver settings and function control of the server's processing unit. Output device 204 may include display devices such as a display screen.

[0129] One or more modules are stored in memory 202, and when executed by one or more processors 201, they perform actions such as... Figure 2 The method shown.

[0130] Those skilled in the art will understand that all or part of the processes in the above method embodiments can be implemented by a computer program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, it can include the processes described in the above method embodiments. The storage medium can be a magnetic disk, optical disk, read-only memory (ROM), random access memory (RAM), flash memory (FM), hard disk drive (HDD), or solid-state drive (SSD), etc.; the storage medium can also include combinations of the above types of memory.

[0131] Although embodiments of the present disclosure have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present disclosure, and all such modifications and variations fall within the scope defined by the appended claims.

[0132] Although embodiments of the present disclosure have been shown and described above, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present disclosure. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present disclosure.

Claims

1. A method for protecting an engine from water shortage, applied to an engine with a cooling system, characterized in that, include: After the engine is started, monitor the current actual speed of the engine; The target speed range of the engine is identified based on the actual speed. The target speed range is one of a plurality of preset speed ranges, and different speed ranges are matched with independent coolant pressure fault diagnosis strategies. Run a coolant pressure fault diagnosis strategy that matches the target speed range to determine whether the cooling system has a coolant pressure fault based on the multi-dimensional operating parameters of the cooling system; as well as, When a coolant pressure failure occurs in the cooling system, a first fault message is issued to indicate that the coolant pressure of the cooling system is below standard, and torque limiting protection is provided for the engine.

2. The method according to claim 1, characterized in that, The cooling system includes an expansion tank, and the method further includes: When a vehicle using the engine is powered on, the current actual liquid level in the expansion tank is obtained; Determine whether the actual liquid level is lower than the preset lower mark of the expansion tank; If so, a second fault message is issued to indicate that the expansion tank level is below the standard, prompting the addition of coolant to the expansion tank after the vehicle is powered off; and, If not, after performing the action of clearing the second fault information, start the engine.

3. The method according to claim 1 or 2, characterized in that, The plurality of speed ranges include: A first speed range is identified when the actual speed is lower than a preset first speed threshold. The second speed range is identified by the actual speed falling between the first speed threshold and a preset second speed threshold; and, The third speed range is identified by the actual speed being higher than the second speed threshold. Wherein, the first speed threshold is less than the second speed threshold.

4. The method according to claim 1 or 2, characterized in that, At least one coolant pressure fault diagnosis strategy matching the speed range is configured as follows: Obtain the current multidimensional operating parameters of the cooling system; Determine whether the multidimensional operating parameters meet the combined diagnostic conditions used to diagnose and eliminate interference in the cooling system's current coolant pressure fault; and, If so, it is determined that the cooling system is currently experiencing a coolant pressure failure.

5. The method according to claim 4, characterized in that, The cooling system includes a water pump, and the multi-dimensional operating parameters include water pump inlet pressure, water pump outlet pressure, and engine coolant temperature. Furthermore, determining whether the multi-dimensional operating parameters meet the combined diagnostic conditions used to diagnose a current coolant pressure fault in the cooling system and eliminate interference includes: The first diagnostic logic is initiated, wherein the first diagnostic logic is used to verify whether the current water pump inlet pressure and the coolant temperature meet preset first combined diagnostic conditions to determine whether the cooling system is currently experiencing a coolant pressure fault. The first combined diagnostic conditions include the water pump inlet pressure being less than zero, the coolant temperature being greater than a preset first set temperature, and a first duration during which the water pump inlet pressure is less than zero and the coolant temperature is greater than the first set temperature being greater than a preset first fault reporting time. The second diagnostic logic is activated. The second diagnostic logic is used to verify whether the current water pump outlet pressure and the coolant temperature meet the preset second combination diagnostic conditions to determine whether the cooling system is currently experiencing a coolant pressure fault. The second combination diagnostic conditions include the water pump outlet pressure being less than the preset first set pressure, the coolant temperature being greater than the preset first set temperature, and a second duration that simultaneously satisfies the condition that the water pump outlet pressure is less than the first set pressure and the coolant temperature is greater than the first set temperature being greater than the preset second fault reporting time.

6. The method according to claim 5, characterized in that, The first diagnostic logic is configured as follows: Determine whether the current water pump inlet pressure is less than zero; When the water pump inlet pressure is less than zero, determine whether the current coolant temperature is greater than a preset first set temperature; When the coolant temperature is greater than the first set temperature, timing begins to obtain the first duration through continuous timing; Determine whether the first duration is greater than the preset first fault reporting time; If the first duration is greater than the first fault reporting time, it is determined that the cooling system is currently experiencing a coolant pressure fault; and, When the timer ends and the first duration is less than the first fault reporting time, the first duration is reset to zero to prevent false alarms of the coolant pressure fault.

7. The method according to claim 5, characterized in that, Different combination diagnostic conditions are used for coolant pressure fault diagnosis strategies matched to different speed ranges, and the first and second diagnostic logics of the same coolant pressure fault diagnosis strategy are executed in parallel. Furthermore, the second diagnostic logic is configured as follows: Determine whether the current water pump outlet pressure is less than a preset first set pressure; When the water pump outlet pressure is less than the first set pressure, it is determined whether the current coolant temperature is greater than the preset first set temperature. When the coolant temperature is greater than the first set temperature, timing begins to obtain the second duration through continuous timing; Determine whether the second duration is greater than the preset second fault reporting time; When the second duration is greater than the second fault reporting time, it is determined that the cooling system is currently experiencing a coolant pressure fault; and, When the timing ends and the second duration is less than the second fault reporting time, the second duration is reset to zero to prevent false alarms of the coolant pressure fault.

8. The method according to claim 1 or 2, characterized in that, The torque limiting protection for the engine includes: Determine a target torque limiting mode that matches the current engine speed range, wherein the target torque limiting mode is one of several preset torque limiting modes of different levels, and different speed ranges are matched with different levels of torque limiting modes; and, The engine is controlled to operate in the target torque-limiting mode to prevent damage to the engine due to coolant pressure failure.

9. An engine coolant shortage protection device, applied to an engine with a cooling system, characterized in that, include: The sensing module is configured to monitor the current actual speed of the engine after the engine is started; The first-level processing module is configured to identify the target speed range of the engine based on the actual speed. The target speed range is one of a plurality of preset speed ranges, and different speed ranges are matched with independent coolant pressure fault diagnosis strategies. The second-level processing module is configured to run a coolant pressure fault diagnosis strategy matched to the target speed range to determine whether a coolant pressure fault has occurred in the cooling system based on the current multi-dimensional operating parameters of the cooling system; and, The execution module is configured to issue a first fault message indicating that the coolant pressure of the cooling system is below standard when a coolant pressure failure occurs in the cooling system, and to perform torque limiting protection on the engine.

10. A storage medium, characterized in that, The storage medium stores a program or instructions, wherein the program or instructions, when executed by a processor, implement the steps of the method as described in any one of claims 1 to 8.

Images