Active pressure maintaining method and device for engine cooling system

Abstract

The invention discloses an active pressure maintaining method and device for an engine cooling system, and the method comprises the steps: obtaining pressure data and temperature data in the cooling system through a sensor, and obtaining a current pressure value and a current temperature value; and determining an initial state evaluation result of the cooling system according to comparison of the current pressure value and the current temperature value with a preset pressure threshold value and a preset temperature threshold value. And if the initial state evaluation result is that the pressure is abnormal, dry gas is injected into the cooling system through a gas injection module, and feedback data of a pressure sensor is obtained until a pressure adjustment value meeting a first preset pressure range is obtained. After the dry gas is injected, feedback data of the pressure sensor are continuously obtained, and the pressure stability state is judged based on the change trend of the feedback data. Therefore, the pressure can be dynamically regulated and controlled, the system stability is improved, the failure rate is reduced, and the cooling efficiency is optimized.

Description

Technical Field

[0001] This invention relates to the field of engine cooling system control technology, and in particular to an active pressure-maintaining method and apparatus for an engine cooling system. Background Technology

[0002] The engine cooling system of commercial vehicles is a core component ensuring stable engine operation under various conditions, and its performance directly affects the vehicle's power output, fuel efficiency, and service life. The cooling system requires precise pressure control to maintain normal coolant circulation and prevent localized overheating or component damage. However, with the increasing complexity of commercial vehicle usage scenarios, such as frequent acceleration and deceleration or long downhill braking during long-distance transportation, the pressure management challenges faced by the cooling system are becoming increasingly severe. Traditional passive pressure-maintaining methods have revealed significant shortcomings in dealing with these dynamic operating conditions and are unable to meet the high reliability and long service life requirements of modern commercial vehicles.

[0003] Traditional cooling systems typically rely on mechanical pressure relief valves and expansion tank pressure caps, relying on the thermal expansion of the coolant and the natural pressure build-up of steam. This approach presents several problems in actual operation. As a core component, the pressure cap is prone to failure after prolonged use due to material aging or seal instability; market data shows a failure rate as high as 40% to 50% after three years. Furthermore, this passive method cannot dynamically adjust pressure according to engine operating conditions, resulting in significant system pressure fluctuations under high loads or extreme conditions, making it difficult to maintain a stable pressure within the ideal range. These fluctuations not only affect cooling efficiency but can also trigger a chain reaction of problems with other components.

[0004] A deeper challenge lies in the fact that traditional systems lack the ability to actively regulate pressure. Passive pressure-maintaining methods rely entirely on the thermal expansion characteristics of the coolant. Under complex operating conditions, such as rapid temperature increases during long downhill braking, the system cannot replenish or release pressure in time to cope with localized boiling. This leads to the formation of bubbles in the coolant, reducing the pump's efficiency and even causing cavitation, thus weakening the overall performance of the cooling system. More seriously, pressure runaway can lead to the formation of localized high-temperature zones, increasing the risk of major malfunctions such as cylinder head cracking.

[0005] In real-world business scenarios, the limitations of this pressure regulation become particularly apparent. For example, in long-haul freight transport, vehicles may experience continuous uphill high-load and downhill braking conditions, requiring the cooling system to cope with drastic temperature and pressure changes in a short period. If the pressure cap fails or cannot respond in time, the coolant may generate a large amount of gas due to localized boiling. This gas cannot be effectively separated or utilized and is released directly into the atmosphere, wasting energy and potentially causing a sudden drop in system pressure, affecting engine cooling performance. This contradiction between the passivity of pressure management and the need for rapid response under dynamic operating conditions becomes a key issue restricting the improvement of cooling system reliability and efficiency. Summary of the Invention

[0006] This invention provides an active pressure-maintaining method and apparatus for an engine cooling system, which can dynamically regulate pressure, improve system stability, reduce failure rate, and optimize cooling efficiency.

[0007] To achieve the above objectives, in a first aspect, the present invention provides an active pressure-maintaining method for an engine cooling system, comprising: Step S1, acquiring pressure and temperature data within the cooling system via sensors to obtain current pressure and current temperature values. Step S2, determining an initial state assessment result of the cooling system based on a comparison of the current pressure and current temperature values ​​with preset pressure and preset temperature thresholds. Step S3, if the initial state assessment result indicates an abnormal pressure, injecting dry gas into the cooling system via a gas injection module and acquiring feedback data from a pressure sensor until a pressure adjustment value satisfying a first preset pressure range is obtained. Step S4, after injecting dry gas, continuously acquiring feedback data from the pressure sensor and determining the pressure stability state based on the changing trend of the feedback data. Step S5, if the pressure stability state does not reach a preset stability threshold, activating a backup gas source and optimizing the gas injection path and rate by adjusting the valve opening until a stable updated pressure value is obtained. Step S6, if the current temperature value or real-time acquired temperature data exceeds a preset temperature threshold during the pressure-maintaining process, activating a degassing system for degassing operation. Step S7: Monitor the updated pressure value. If it exceeds the second preset pressure range, release the excess gas through the pressure relief valve to obtain the final stable pressure value.

[0008] Secondly, the present invention provides an active pressure-maintaining device for an engine cooling system. Based on the aforementioned active pressure-maintaining method for an engine cooling system, the active pressure-maintaining device includes: an acquisition module, a result determination module, an adjustment value acquisition module, a state judgment module, a pressure value acquisition module, a start-up module, and a stable pressure value acquisition module. The acquisition module is used to acquire pressure and temperature data within the cooling system through sensors to obtain the current pressure and temperature values. The result determination module is used to determine the initial state evaluation result of the cooling system based on a comparison of the current pressure and temperature values ​​with preset pressure and temperature thresholds. The adjustment value acquisition module is used to inject dry gas into the cooling system through a gas injection module if the initial state evaluation result indicates pressure abnormality, and acquire feedback data from the pressure sensor until a pressure adjustment value satisfying a first preset pressure range is obtained. The state judgment module is used to continuously acquire feedback data from the pressure sensor after injecting dry gas, and judge the pressure stability state based on the changing trend of the feedback data. The pressure value acquisition module is used to start a backup gas source and optimize the gas injection path and rate by adjusting the valve opening if the pressure stability state does not reach a preset stability threshold, until a stable updated pressure value is obtained. The start-up module is used to activate the degassing system to perform degassing operations if the current temperature value or the real-time temperature data exceeds a preset temperature threshold during the pressure holding process. The module for obtaining a stable pressure value is used to monitor the updated pressure value; if it exceeds a second preset pressure range, it releases excess gas through a pressure relief valve to obtain a final stable pressure value.

[0009] Thirdly, the present invention provides an electronic device comprising: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, the instructions being executed by the at least one processor to enable the at least one processor to perform the active pressure holding method for an engine cooling system as described above.

[0010] Fourthly, the present invention provides a computer-readable storage medium including a computer program and instructions, which, when the computer program or the instructions are executed on a computer, cause the computer to perform the active pressure-maintaining method for an engine cooling system as described above.

[0011] Compared with the prior art, the active pressure holding method and device for an engine cooling system according to the present invention effectively solves the problems of large pressure fluctuations and slow response in the traditional passive pressure holding method by monitoring pressure and temperature data in real time, dynamically adjusting gas injection and depressurization operations, and combining a multi-level pressure stability judgment mechanism. It has the advantages of improving the stability of the cooling system, reducing the failure rate of components, and optimizing engine operating efficiency. Attached Figure Description

[0012] Figure 1 This is a schematic flowchart of an active pressure-maintaining method for an engine cooling system according to Embodiment 1 of the present invention;

[0013] Figure 2 This is a schematic diagram of the structure of an active pressure-maintaining device for an engine cooling system according to Embodiment 2 of the present invention;

[0014] Figure 3 This is a schematic diagram of the structure of an electronic device according to Embodiment 3 of the present invention. Detailed Implementation

[0015] The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit the scope of the invention. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the embodiments of the present invention, and not all structures.

[0016] To facilitate understanding, the main implementation concepts of the various embodiments of the present invention will be briefly described first.

[0017] In existing technologies, commercial vehicle engine cooling systems have long relied on passive pressure-maintaining methods, using mechanical pressure relief valves and expansion tank pressure caps to maintain system pressure. This approach suffers from drawbacks such as delayed pressure regulation and susceptibility to component aging and failure, especially under complex operating conditions where it struggles to cope with dynamic temperature and pressure changes. For example, during long downhill braking, a sudden rise in coolant temperature can lead to localized boiling, and traditional systems cannot replenish pressure in time, creating a risk of cavitation. Furthermore, the pressure cap's sealing performance deteriorates over time, exacerbating system pressure fluctuations, affecting cooling efficiency, and potentially causing cylinder block cracking and other malfunctions.

[0018] To address the aforementioned issues, the inventors observed the core contradiction that passive pressure-maintaining mechanisms cannot respond to dynamic operating conditions and proposed establishing an active control system. First, traditional systems lack real-time data feedback, making it impossible to determine the specific type of pressure anomaly. Second, single-source gas injection is prone to fluctuations during pressure compensation, requiring multi-path coordinated adjustment. Furthermore, the coupling relationship between temperature and pressure is not effectively utilized, resulting in a lack of triggering criteria for degassing operations. Based on these findings, the inventors constructed a data-driven closed-loop control logic, achieving precise control of system pressure through multi-sensor collaborative monitoring, multi-stage pressure compensation, and a dynamic threshold judgment mechanism.

[0019] Example 1, Figure 1 This is a flowchart illustrating an active pressure-maintaining method for an engine cooling system according to Embodiment 1 of the present invention, as shown below. Figure 1As shown, Embodiment 1 provides an active pressure-maintaining method for an engine cooling system, including: Step S1, acquiring pressure and temperature data within the cooling system via sensors to obtain current pressure and temperature values. Step S2, determining the initial state assessment result of the cooling system based on a comparison of the current pressure and temperature values ​​with preset pressure and temperature thresholds. Step S3, if the initial state assessment result indicates pressure anomaly, injecting dry gas into the cooling system via a gas injection module and acquiring feedback data from the pressure sensor until a pressure adjustment value satisfying a first preset pressure range is obtained. Step S4, after injecting dry gas, continuously acquiring feedback data from the pressure sensor and determining the pressure stability state based on the changing trend of the feedback data. Step S5, if the pressure stability state does not reach a preset stability threshold, activating a backup gas source and optimizing the gas injection path and rate by adjusting the valve opening until a stable updated pressure value is obtained. Step S6, if the current temperature value or real-time acquired temperature data exceeds a preset temperature threshold during the pressure-maintaining process, activating a degassing system for degassing operation. Step S7: Monitor the updated pressure value. If it exceeds the second preset pressure range, release the excess gas through the pressure relief valve to obtain the final stable pressure value.

[0020] The gas injection module refers to the actuator that injects dry gas into the cooling system. This can be achieved using a solenoid-controlled air pump system, with the gas flow rate controlled by adjusting the valve opening. Pressure stability refers to the stability of the system pressure over time, which can be determined by comparing the calculated pressure change rate with a preset threshold, used to evaluate the effectiveness of pressure compensation. The degassing system is a device used to remove gas from the cooling system. This can be implemented using a combination of an electric exhaust valve and a gas-liquid separator, activated when the temperature is abnormal to eliminate the risk of cavitation. The pressure relief valve is a mechanically or electronically controlled valve that automatically opens when the pressure exceeds a safety threshold. This can be a spring-loaded safety valve used to prevent damage from overpressure.

[0021] Specifically, this invention uses a sensor network to collect pressure and temperature data in real time and establishes a multi-dimensional state assessment model. When an abnormal pressure is detected, the main air source is first activated for basic pressure compensation, and closed-loop feedback control ensures that the pressure value enters the preset range. During the pressure stabilization phase, the slope characteristics of the pressure change curve are analyzed to determine whether there are any abnormalities such as leakage or gas dissolution in the system. When pressure fluctuations exceed the allowable range, a backup air source is activated and the collaborative working mode of multiple valves is adjusted to form a redundant pressure compensation mechanism. The temperature monitoring module is linked with the degassing system; when the coolant temperature continues to exceed the standard, the venting operation is automatically triggered to eliminate cavitation causes. Finally, through precise control of the pressure relief valve, the system pressure is maintained within the optimal operating range.

[0022] Compared to existing technologies, traditional passive pressure-maintaining methods rely solely on the thermal expansion of coolant to establish pressure, lacking active regulation capabilities. This invention achieves dynamic pressure balance through closed-loop control logic, actively replenishing gas when pressure is insufficient and intelligently releasing pressure when it is excessive. Traditional methods cannot distinguish between different types of pressure anomalies, while this solution, through multi-dimensional state assessment, can accurately identify different fault modes such as insufficient pressure and high-temperature pressure anomalies. Furthermore, in existing technologies, temperature and pressure control are independent; this invention establishes a temperature-triggered degassing mechanism, effectively preventing cavitation.

[0023] Based on the above analysis, it can be seen that this invention can respond to dynamic pressure changes in the cooling system in real time and maintain pressure stability under extreme conditions such as long downhill braking. By coordinating the main and backup air sources, the pressure compensation response time is shortened, avoiding system failure due to a single air source malfunction. The temperature-triggered degassing mechanism effectively reduces the risk of coolant vaporization and improves water pump efficiency. The multi-stage pressure regulation strategy keeps the system pressure within the optimal range, reducing stress fluctuations on mechanical components and extending the service life of critical components such as pressure caps.

[0024] In this embodiment, step S2 includes: Step S21, comparing the current pressure value with a preset pressure threshold, and comparing the current temperature value with a preset temperature threshold. Step S22, if the current pressure value is lower than the preset pressure threshold and the current temperature value is within the preset temperature threshold range, then the initial state assessment result is insufficient pressure abnormality. Step S23, if the current pressure value is lower than the preset pressure threshold and the current temperature value is higher than the preset temperature threshold, then the initial state assessment result is high temperature pressure abnormality. Step S24, if the current pressure value is within the preset pressure threshold range and the current temperature value is higher than the preset temperature threshold, then the initial state assessment result is temperature abnormality. Step S25, if both the current pressure value and the current temperature value are within the preset threshold range, then the initial state assessment result is normal.

[0025] Specifically, the current pressure value refers to the internal pressure data of the cooling system collected in real time by a pressure sensor, which can be implemented using a piezoresistive or piezoelectric sensor, to reflect the real-time pressure status of the system. The preset pressure threshold refers to the pressure range set according to engine operating conditions and cooling system design requirements, which can be determined through experimental data or historical operating parameters, and is used to determine whether the pressure is within the normal range. The current temperature value refers to the coolant temperature data collected in real time by a temperature sensor, which can be implemented using a thermocouple or thermistor, and is used to monitor the system's thermal state. The preset temperature threshold refers to the temperature critical value set according to the coolant boiling point and system safety requirements, for example, it can be set between 90℃ and 110℃, and is used to identify temperature anomalies. Insufficient pressure anomaly refers to a condition where the system pressure is lower than the minimum operating requirement but the temperature is not exceeded. High temperature pressure anomaly refers to a combined fault of insufficient pressure and excessive temperature. Temperature anomaly refers to a situation where the pressure is normal but the temperature exceeds the safe range.

[0026] By simultaneously comparing pressure and temperature parameters, different types of system anomalies can be accurately distinguished. When the pressure sensor detects that the pressure is below a preset threshold, the anomaly type is further determined by combining temperature data: if the temperature is within limits, it is determined to be a simple pressure deficiency, requiring gas replenishment; if the temperature also exceeds limits, it is determined to be a pressure anomaly caused by high temperature, requiring priority cooling; if only the temperature exceeds limits, an independent temperature control mechanism is triggered. This multi-condition judgment mechanism avoids misjudgment based on a single parameter. For example, when high temperature causes pressure fluctuations, traditional methods may misjudge it as a simple pressure deficiency and incorrectly replenish gas, while this solution can accurately identify complex faults through temperature correlation analysis.

[0027] Based on the above analysis, it is clear that this invention can accurately identify the types of cooling system anomalies, avoiding erroneous operations caused by misjudgment of a single parameter. For example, in long downhill braking conditions, a rapid increase in coolant temperature may lead to abnormal pressure fluctuations. This invention, by correlating temperature and pressure, can promptly distinguish whether degassing or gas replenishment is required, preventing cavitation. Simultaneously, it provides a clear control direction for subsequent pressure adjustments; for example, in cases of high-temperature pressure anomalies, prioritizing temperature reduction rather than simply replenishing gas improves system response efficiency and reliability.

[0028] In this embodiment, step S3 includes: Step S31, if the initial state assessment result is an abnormal pressure, controlling the gas injection module to start and inject dry gas into the cooling system. Step S32, during the injection process, real-time feedback data from the pressure sensor is acquired to obtain a real-time pressure value. Step S33, comparing the real-time pressure value with the first preset pressure range. Step S34, if the real-time pressure value does not reach the lower limit of the first preset pressure range, controlling the gas injection module to increase the injection rate or increase the valve opening to continue injection. Step S35, if the real-time pressure value has reached the first preset pressure range, controlling the gas injection module to stop injection. Step S36, recording the real-time pressure value at the time of stopping injection as the pressure adjustment value.

[0029] The gas injection module is an actuator used to replenish gas to the cooling system. It can be implemented using a compressed air pipeline controlled by a solenoid valve, and its function is to actively replenish system pressure to correct abnormal conditions. The pressure sensor is a pressure detection device installed within the cooling system, which can be implemented using a piezoelectric sensor. Its function is to provide real-time feedback on changes in internal system pressure. The first preset pressure range refers to a pre-set pressure adjustment target range, which can be determined by engine operating parameters. Its function is to provide a dynamic adjustment benchmark for pressure adjustment.

[0030] Specifically, when the system detects an abnormal pressure, the gas injection module is activated and begins replenishing dry gas. During this process, the pressure sensor collects pressure data at a fixed frequency, such as once per second, and compares the real-time pressure value with a preset range. If the real-time pressure is below the target lower limit, the gas injection rate is increased by increasing the valve opening or increasing the pump speed. This adjustment process continues until the pressure value enters the preset range, at which point gas injection stops and the final pressure value is recorded as the adjustment benchmark. For example, when the first preset pressure range is set to 120 kPa to 150 kPa, injection stops if the real-time pressure reaches 145 kPa.

[0031] Existing methods rely on the natural expansion of coolant to establish pressure, and cannot actively replenish gas to correct pressure anomalies. This invention, however, uses a closed-loop controlled gas injection mechanism to dynamically adjust injection parameters based on real-time pressure data. For example, it immediately initiates compensation when insufficient pressure is detected, preventing localized boiling of the coolant due to insufficient pressure.

[0032] Based on the above analysis, it can be seen that this invention achieves precise and active control of the cooling system pressure. When an abnormal pressure is detected, it can quickly replenish gas to the target range, effectively preventing a decrease in cooling efficiency or cavitation caused by insufficient pressure. Through the dynamic coordination of real-time pressure monitoring and injection rate, it ensures that the system maintains a stable operating pressure under complex operating conditions.

[0033] In this embodiment, step S4 includes: Step S41, continuously acquiring feedback data from the pressure sensor at fixed time intervals for a period of time after gas injection stops, obtaining pressure-time series data. Step S42, calculating the pressure change rate of the pressure-time series data over a period of time. Step S43, comparing the pressure change rate with a preset stable change rate threshold. Step S44, if the absolute value of the pressure change rate is less than or equal to the stable change rate threshold, then the pressure stability state is determined to be stable. Step S45, if the absolute value of the pressure change rate is greater than the stable change rate threshold, then the pressure stability state is determined to be unstable.

[0034] Pressure-time series data refers to a continuous set of pressure values ​​collected by pressure sensors at fixed time intervals, specifically by collecting pressure data once per second, reflecting the dynamic characteristics of pressure changes over time. The pressure change rate refers to the rate of pressure change per unit time, specifically calculated by dividing the pressure difference between two adjacent time points by the time interval, used to quantify the degree of pressure fluctuation. The stable change rate threshold is a pre-set allowable range for pressure fluctuations, specifically obtained through experimental calibration based on the operating characteristics of the cooling system, serving as a critical value for determining whether the system has reached a stable state. After the gas injection operation is completed, the system enters the pressure stability assessment phase. Pressure sensors continuously collect pressure data at fixed time intervals, for example, recording pressure values ​​every 0.5 seconds, forming a sequence containing pressure data from multiple time points. Mathematical processing of this sequence, such as using linear regression to calculate the pressure change trend per unit time, yields the pressure change rate value. This value is compared with a pre-set stability threshold; when the absolute value of the change rate is below the threshold, it indicates that the system pressure is in a stable convergence state; if it exceeds the threshold range, a subsequent adjustment mechanism is triggered. This judgment method based on dynamic data analysis can effectively identify abnormal pressure fluctuations caused by uneven gas injection or system leakage.

[0035] Based on the above analysis, it can be seen that the present invention can accurately identify the pressure stability state of the cooling system after pressure holding operation, avoiding bubble formation and local overheating caused by continuous pressure fluctuations. By quantitatively assessing the pressure change trend, the backup air source adjustment mechanism can be triggered in a timely manner, ensuring that the system maintains a stable pressure environment under complex operating conditions, effectively preventing cavitation and improving coolant circulation efficiency.

[0036] In this embodiment, step S5 includes: Step S51, controlling the opening of the valve of the backup gas source and initially adjusting the valve opening ratio between the main gas source and the backup gas source. Step S52, acquiring feedback data from the pressure sensor in real time based on the updated gas injection rate. Step S53, calculating the pressure change rate of the feedback data and determining whether its absolute value is less than a preset stability threshold. Step S54, if the pressure change rate is still greater than or equal to the stability threshold, continuing to adjust the valve opening to change the gas injection path or rate, and returning to step S52. Step S55, if the pressure change rate is less than the stability threshold, determining that the system has reached a stable state, and recording the current pressure value. Step S56, using the recorded current pressure value as the updated stable pressure value.

[0037] Specifically, the backup gas source refers to an auxiliary gas supply device independent of the main gas source. This can be implemented using high-pressure nitrogen cylinders or electric air compressors, providing supplementary gas when the main gas source supply is insufficient or has a delayed response. Valve opening ratio adjustment refers to adjusting the opening degree of control valves on the main and backup gas source pipelines. This can be achieved using proportional control valves or stepper motor-driven valves, used to balance the gas flow from different sources. Pressure change rate calculation refers to performing time-series analysis on continuously collected pressure data. This can be done using the difference method or linear regression method to calculate the pressure change per unit time, used to quantify the degree of system pressure fluctuation. When system pressure stability is not up to standard, the main and backup gas sources are simultaneously activated, and a mixed gas supply mode is formed by adjusting their respective valve openings. In the initial stage, the valve opening ratio of the main and backup gas sources can be set to, for example, a 7:3 ratio, at which time the pressure sensor continuously collects system pressure data. The system is judged to be stabilizing by calculating the pressure change rate. If the absolute value of the pressure change rate still exceeds the threshold, the gas supply path is changed by adjusting the valve opening. For example, the main gas source valve opening is reduced to 60% while the backup gas source opening is increased to 45%, forming a new gas mixing ratio. This process is repeated until the pressure change rate is lower than the stabilization threshold for three consecutive sampling periods, at which point the system pressure reaches a dynamic equilibrium state.

[0038] Existing pressure regulation methods rely on a single gas source and use a fixed valve opening, which can easily lead to slow pressure recovery due to insufficient gas supply under complex operating conditions. This solution, through dual-source coordinated gas supply and dynamic valve adjustment, can quickly establish a multi-path compensation mechanism during pressure fluctuations. For example, when the coolant temperature rises sharply due to braking on a long downhill slope, the backup gas source can immediately replenish the gas volume lost due to thermal expansion, while the replenishment rate is precisely controlled by adjusting the valve opening in real time. This invention can quickly establish a multi-source coordinated working mechanism when the system pressure fluctuates drastically, effectively avoiding pressure runaway problems caused by the delayed response of a single gas source. The optimized configuration of the gas injection path is achieved through dynamic valve opening adjustment. For example, when the coolant locally boils and generates bubbles, the optimized gas injection path can preferentially replenish dry gas to the low-pressure area, thereby suppressing cavitation. The real-time calculation and feedback mechanism of the pressure change rate ensures that the system can maintain pressure stability under complex operating conditions. For example, in continuous acceleration and deceleration conditions, the system can control the pressure fluctuation amplitude within the allowable range by repeatedly fine-tuning the valve opening.

[0039] In this embodiment, step S6 includes: Step S61, acquiring coolant temperature data in real time using a temperature sensor. Step S62, comparing the real-time temperature data with a preset temperature threshold; if the real-time temperature data continuously exceeds the preset temperature threshold for a first duration, generating a degassing trigger signal. Step S63, controlling the opening of the degassing system's exhaust valve based on the degassing trigger signal. Step S64, continuously monitoring coolant temperature data during the exhaust process. Step S65, when the monitored coolant temperature data drops below the preset temperature threshold and stabilizes for a second duration, controlling the closing of the degassing system's exhaust valve. Step S66, recording the system state upon completion of the degassing operation.

[0040] The temperature sensor is a device used to collect coolant temperature data in real time, specifically a thermocouple or resistance temperature detector (RTD) sensor, and its function is to continuously monitor system temperature changes. The preset temperature threshold is a pre-set upper limit for the safe operating temperature of the coolant, which can be determined by engine operating parameters and coolant characteristics, and is used to determine whether to trigger the degassing operation. The first duration is the threshold for the duration of the temperature exceeding the limit, specifically set to 10 to 30 seconds, to avoid false triggering caused by instantaneous temperature fluctuations. The degassing system is a device used to expel gases from the cooling system, specifically implemented through an exhaust pipe controlled by a solenoid valve, and its function is to eliminate the accumulation of gases generated by high temperatures. The exhaust valve is an actuator that controls the gas emission path, specifically a proportional control valve, used to precisely control the exhaust rate. The second duration is the duration required for the temperature to stabilize, specifically set to 5 to 15 seconds, to confirm that the system temperature has reliably returned to a safe range.

[0041] Specifically, when the temperature sensor detects that the coolant temperature continuously exceeds a preset threshold during the operation of the cooling system, the system automatically initiates the degassing process. For example, during long downhill braking conditions, the engine continuously generates heat, causing the coolant temperature to rise. If the temperature does not drop back to a safe range within 30 seconds, the exhaust valve is triggered to open. During the exhaust process, the temperature sensor continuously provides data. Once the temperature drops below the threshold and remains stable for 10 seconds, the valve automatically closes and records the current system pressure and temperature parameters. The entire process achieves dynamic balance between temperature and pressure through closed-loop control, avoiding the problem of traditional passive pressure relief methods failing to respond in a timely manner.

[0042] In other words, this invention can actively initiate a degassing operation when the coolant temperature rises abnormally, effectively eliminating gas accumulation caused by local boiling and maintaining stable cooling system pressure. This invention solves the problem that traditional passive pressure relief methods cannot dynamically respond to temperature changes, prevents cavitation from affecting pump efficiency, reduces unnecessary coolant loss, and improves system reliability.

[0043] In this embodiment, step S7 includes: Step S71, continuously monitoring the updated pressure value. Step S72, comparing the updated pressure value with the upper limit of the second preset pressure range. Step S73, if the updated pressure value continuously exceeds the upper limit for a preset time, generating a pressure relief trigger signal. Step S74, according to the pressure relief trigger signal, controlling the opening of the pressure relief valve to release excess gas in the cooling system into the external environment. Step S75, during the pressure relief process, continuously monitoring the pressure value, and generating a shutdown signal when the pressure value drops to the second preset pressure range. Step S76, according to the shutdown signal, controlling the closing of the pressure relief valve, and recording the pressure value at this time as the final stable pressure value.

[0044] Specifically, the updated pressure value refers to the system pressure data after gas injection adjustment, which can be achieved in real time using a pressure sensor to reflect the dynamic pressure state after the pressure holding operation. The second preset pressure range refers to the safe pressure interval set according to the operating characteristics of the cooling system, which can be implemented using a preset pressure threshold database to determine whether the system is in an overpressure state. The pressure relief trigger signal refers to the logic control command generated based on the pressure monitoring results, which can be implemented using a threshold comparison circuit or control algorithm to trigger the opening of the pressure relief valve. The final stable pressure value refers to the steady-state pressure value maintained by the system after the pressure relief operation is completed, which can be achieved using the instantaneous reading of the pressure sensor when the pressure relief valve is closed, and is used to record the pressure reference for the system to return to normal operation.

[0045] After the system completes gas injection and pressure adjustment, it continuously acquires updated pressure values ​​via pressure sensors and dynamically compares these values ​​with a second preset pressure range. When the pressure value continuously exceeds the upper limit threshold for a preset duration, the control unit generates a pressure relief trigger signal to open the pressure relief valve. During the pressure relief process, the system continuously monitors pressure changes, and immediately closes the pressure relief valve when the pressure returns to a safe range, outputting the current pressure value as the final stable value. This process achieves dynamic pressure balance through closed-loop control, preventing system seal failure or component damage due to overpressure.

[0046] Existing passive pressure relief methods rely solely on mechanical pressure valves for unidirectional pressure relief, failing to dynamically adjust based on real-time pressure changes. This solution combines pressure monitoring with active control to achieve precise triggering and timely termination of pressure relief operations, avoiding pressure oscillations caused by delayed or excessive pressure relief in traditional methods. Furthermore, the introduction of preset time conditions effectively distinguishes between instantaneous pressure fluctuations and sustained overpressure states, reducing the risk of misoperation. This invention effectively solves the problem of seal damage or pipeline leakage caused by excessive pressure during the pressure holding process in cooling systems. Under continuous braking conditions in commercial vehicles, when a sudden rise in coolant temperature causes abnormal pressure, this solution can quickly respond and precisely release excess gas, ensuring that the system pressure remains within a safe range, thereby preventing cavitation and the formation of localized high-temperature areas, and extending the service life of critical engine components.

[0047] Example 2, Figure 2 This is a schematic diagram of the structure of an active pressure-maintaining device for an engine cooling system according to Embodiment 2 of the present invention, as shown below. Figure 2As shown, Embodiment 2 provides an active pressure-maintaining device for an engine cooling system. Based on the active pressure-maintaining method for an engine cooling system described in Embodiment 1, the active pressure-maintaining device includes: an acquisition module 201, a result determination module 202, an adjustment value acquisition module 203, a state judgment module 204, a pressure value acquisition module 205, a start-up module 206, and a stable pressure value acquisition module 207. The acquisition module 201 is used to acquire pressure and temperature data within the cooling system through sensors to obtain the current pressure and temperature values. The result determination module 202 is used to determine the initial state evaluation result of the cooling system based on a comparison of the current pressure and temperature values ​​with preset pressure and temperature thresholds. The adjustment value acquisition module 203 is used to inject dry gas into the cooling system through a gas injection module if the initial state evaluation result indicates pressure abnormality, and acquire feedback data from the pressure sensor until a pressure adjustment value satisfying a first preset pressure range is obtained. The state judgment module 204 is used to continuously acquire feedback data from the pressure sensor after injecting dry gas, and judge the pressure stability state based on the changing trend of the feedback data. The pressure value acquisition module 205 is used to, if the pressure stability state does not reach a preset stability threshold, activate a backup gas source and optimize the gas injection path and rate by adjusting the valve opening until a stable updated pressure value is obtained. The activation module 206 is used to, if the current temperature value or real-time acquired temperature data exceeds a preset temperature threshold during the pressure holding process, activate the degassing system to perform degassing operations. The stable pressure value acquisition module 207 is used to monitor the updated pressure value; if it exceeds a second preset pressure range, it releases excess gas through a pressure relief valve to obtain the final stable pressure value.

[0048] The various variations and specific examples of the active pressure holding method for the engine cooling system provided in Embodiment 1 are also applicable to the active pressure holding device for the engine cooling system provided in this embodiment. Through the foregoing detailed description of an active pressure holding method for an engine cooling system, those skilled in the art can clearly understand the implementation method of an active pressure holding device for an engine cooling system in this embodiment. Therefore, for the sake of brevity, it will not be described in detail here.

[0049] Example 3, Figure 3 This is a schematic diagram of the structure of an electronic device according to Embodiment 3 of the present invention, as shown below. Figure 3 As shown, Embodiment 3 also provides an electronic device 300, which may include a processor 301 and a memory 302.

[0050] Memory 302 is used to store programs. Memory 302 may include volatile memory, such as random-access memory (RAM), such as static random-access memory (SRAM), double data rate synchronous dynamic random-access memory (DDR SDRAM), etc.; memory may also include non-volatile memory, such as flash memory. Memory 302 is used to store computer programs (such as application programs, functional modules, etc. that implement the above methods), computer instructions, etc. The computer programs, computer instructions, etc., can be partitioned and stored in one or more memories 302. Furthermore, the computer programs, computer instructions, data, etc., can be accessed by processor 301.

[0051] The aforementioned computer programs and instructions can be stored in one or more partitions of memory 302. Furthermore, the aforementioned computer programs and instructions can be invoked by processor 301.

[0052] The processor 301 is configured to execute the computer program stored in the memory 302 to implement the various steps of the methods described in the above embodiments. For details, please refer to the relevant descriptions in the preceding method embodiments.

[0053] The processor 301 and the memory 302 can be independent structures or integrated structures. When the processor 301 and the memory 302 are independent structures, the memory 302 and the processor 301 can be coupled together via bus 303.

[0054] The electronic device in this embodiment can execute the technical solution in the above method. Its specific implementation process and technical principle are the same, and will not be repeated here.

[0055] Example 4, Example 4 also provides a computer-readable storage medium including a computer program and instructions, which, when the computer program or instructions are run on a computer, cause the computer to execute the active pressure-maintaining method for the engine cooling system of any embodiment of the present invention.

[0056] Computer-readable storage media include various media that can store program code, such as USB flash drives, external hard drives, ROM, RAM, magnetic disks, or optical disks.

[0057] This embodiment also provides a computer program product, which includes: a computer program stored in a readable storage medium, at least one processor of an electronic device can read the computer program from the readable storage medium, and the at least one processor executes the computer program to cause the electronic device to perform the solution provided in any of the above embodiments.

[0058] It should be understood that the various forms of processes shown above can be used to rearrange, add, or delete steps. For example, the steps described in this invention disclosure can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution disclosed in this invention can be achieved, and this is not limited herein.

[0059] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. An active pressure maintenance method for an engine cooling system, characterized by, The method comprises the following steps: Step S1, obtaining pressure data and temperature data in the cooling system through a sensor to obtain a current pressure value and a current temperature value; Step S2, determining an initial state evaluation result of the cooling system according to a comparison between the current pressure value and the current temperature value and a preset pressure threshold and a preset temperature threshold; Step S3, if the initial state evaluation result is a pressure abnormality, injecting dry gas into the cooling system through a gas injection module, and obtaining feedback data of the pressure sensor until a pressure adjustment value meeting a first preset pressure range is obtained; Step S4, after injecting the dry gas, continuously obtaining the feedback data of the pressure sensor, and judging a pressure stability state based on a change trend of the feedback data; Step S5, if the pressure stability state does not reach a preset stability threshold, starting a backup gas source and optimizing a gas injection path and a rate by adjusting a valve opening degree until a stable updated pressure value is obtained; Step S6, if the current temperature value or real-time obtained temperature data exceeds the preset temperature threshold during the pressure maintaining process, starting a gas removal system to perform a gas removal operation; Step S7, monitoring the updated pressure value, if it exceeds a second preset pressure range, releasing excess gas through a pressure relief valve to obtain a final stable pressure value.

2. The method of claim 1, wherein, The step S2 comprises: Step S21, comparing the current pressure value with the preset pressure threshold, and comparing the current temperature value with the preset temperature threshold; Step S22, if the current pressure value is lower than the preset pressure threshold, and the current temperature value is within the preset temperature threshold range, the initial state evaluation result is a pressure deficiency abnormality; Step S23, if the current pressure value is lower than the preset pressure threshold, and the current temperature value is higher than the preset temperature threshold, the initial state evaluation result is a high-temperature pressure abnormality; Step S24, if the current pressure value is within the preset pressure threshold range, and the current temperature value is higher than the preset temperature threshold, the initial state evaluation result is a temperature abnormality; Step S25, if the current pressure value and the current temperature value are both within the preset threshold range, the initial state evaluation result is normal.

3. The method of claim 1, wherein, The step S3 comprises: Step S31, if the initial state evaluation result is a pressure abnormality, controlling the gas injection module to start and inject dry gas into the cooling system; Step S32, during the injection process, obtaining real-time feedback data of the pressure sensor to obtain a real-time pressure value; Step S33, comparing the real-time pressure value with the first preset pressure range; Step S34, if the real-time pressure value does not reach the lower limit of the first preset pressure range, controlling the gas injection module to increase the injection rate or the valve opening degree to continue injecting; Step S35, if the real-time pressure value has reached the first preset pressure range, controlling the gas injection module to stop injecting; Step S36, recording the real-time pressure value at the time of stopping injection as the pressure adjustment value.

4. The method of claim 1, wherein, The step S4 comprises: Step S41, obtaining the feedback data of the pressure sensor at fixed time intervals for a period of time after stopping the injection of gas, to obtain a pressure-time sequence data; Step S42, calculating the pressure change rate of the pressure-time sequence data in a period of time; Step S43, comparing the pressure change rate with a preset stable change rate threshold; Step S44, if the absolute value of the pressure change rate is less than or equal to the stable change rate threshold, determining that the pressure stability state is stable; Step S45, if the absolute value of the pressure change rate is greater than the stable change rate threshold, determining that the pressure stability state is unstable.

5. The method of claim 1, wherein, The step S5 comprises: Step S51, controlling to open the valve of the standby gas source, and preliminarily adjusting the valve opening degree ratio of the main gas source and the standby gas source; Step S52, obtaining the feedback data of the pressure sensor in real time based on the updated gas injection rate; Step S53, calculating the pressure change rate of the feedback data, and determining whether the absolute value is less than a preset stable threshold; Step S54, if the pressure change rate is still greater than or equal to the stable threshold, continuing to adjust the valve opening degree to change the gas injection path or rate, and returning to step S52; Step S55, if the pressure change rate is less than the stable threshold, determining that the system has reached a stable state, and recording the current pressure value; Step S56, taking the recorded current pressure value as the updated stable pressure value.

6. An active pressure maintenance method for an engine cooling system as recited in claim 1, wherein, The step S6 comprises: Step S61, obtaining cooling liquid temperature data in real time through a temperature sensor; Step S62, comparing the real-time temperature data with a preset temperature threshold, and generating a degassing trigger signal if the real-time temperature data continuously exceeds the preset temperature threshold for a first time length; Step S63, according to the degassing trigger signal, controlling to open the exhaust valve of the degassing system; Step S64, continuously monitoring the cooling liquid temperature data during the exhaust process; Step S65, when the cooling liquid temperature data is monitored to drop below the preset temperature threshold and stabilize for a second time length, controlling to close the exhaust valve of the degassing system; Step S66, recording the system state when the degassing operation is completed.

7. An active pressure maintenance method for an engine cooling system as set forth in claim 1, characterized by, The step S7 comprises: Step S71, continuously monitoring the updated pressure value; Step S72, comparing the updated pressure value with an upper limit value of the second preset pressure range; Step S73, if the updated pressure value continuously exceeds the upper limit value for a preset time, generating a pressure relief trigger signal; Step S74, according to the pressure relief trigger signal, controlling to open the pressure relief valve to release excess gas in the cooling system to the external environment; Step S75, continuously monitoring the pressure value during the pressure relief process, and generating a closing signal when the pressure value is monitored to drop to the second preset pressure range; Step S76, according to the closing signal, controlling to close the pressure relief valve, and recording the pressure value at this time as the final stable pressure value.

8. An active pressure maintaining device for an engine cooling system based on the active pressure maintaining method for an engine cooling system according to any one of claims 1 to 7, characterized by, The engine cooling system active pressure maintaining device comprises: a obtaining module, configured to obtain pressure data and temperature data in the cooling system through a sensor, to obtain a current pressure value and a current temperature value; A determination result module is configured to determine an initial state evaluation result of the cooling system according to a comparison between the current pressure value and the current temperature value and a preset pressure threshold and a preset temperature threshold. An adjustment value obtaining module is configured to, if the initial state evaluation result is a pressure abnormality, inject dry gas into the cooling system through a gas injection module, and obtain feedback data of the pressure sensor until a pressure adjustment value meeting a first preset pressure range is obtained. A state judgment module is configured to, after the dry gas is injected, continuously obtain feedback data of the pressure sensor, and judge a pressure stability state based on a change trend of the feedback data. A pressure value obtaining module is configured to, if the pressure stability state does not reach a preset stability threshold, start a backup gas source and optimize a gas injection path and a rate by adjusting a valve opening degree until a stable updated pressure value is obtained. A starting module is configured to, if the current temperature value or real-time obtained temperature data exceeds a preset temperature threshold during the pressure maintaining process, start a gas removal system to perform a gas removal operation. A stable pressure value obtaining module is configured to monitor the updated pressure value, and if the updated pressure value exceeds a second preset pressure range, release excess gas through a pressure relief valve to obtain a final stable pressure value.

9. An electronic device, comprising: comprise: at least one processor; and a memory connected with the at least one processor in communication; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the method of any one of claims 1-7.

10. A computer-readable storage medium, characterized in that, comprise computer programs and instructions, when the computer programs or the instructions are run on a computer, so that the computer performs the method of any one of claims 1-7.

Images