Ventilation valve operation monitoring method and system

Abstract

The invention relates to the technical field of breather valves, in particular to a breather valve operation monitoring method and system.The breather valve operation monitoring method is characterized in that a pressure sensor and a temperature sensor are arranged on a cavity, and the following core steps are executed: firstly, the current temperature Tn and pressure Pn in the cavity are obtained; secondly, the current ventilation rate is calculated according to the pressure change in the cavity cooling process and compared with the rated ventilation rate, and if the current ventilation rate is lower than a rated value which is equal to the first threshold value k1 or the second threshold value k2, a ventilation valve performance alarm (k1gt, k2) is output; and finally, according to the current temperature Tn, querying a reference pressure-temperature corresponding relation to obtain a standard pressure P0, and if the current pressure Pn is lower than the standard pressure P0 which is equal to a third threshold k3 or a fourth threshold k4 and exceeds a corresponding set time, outputting a ventilation valve state alarm (k3gt, k4). And real-time and accurate diagnosis and early warning of performance degradation and damage faults of the breather valve are realized.

Description

Technical Field

[0001] This invention relates to the field of vent valve technology, specifically to a method and system for monitoring the operation of a vent valve. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] The three-electric system (i.e., drive motor, motor controller, and power battery) is the core power component of new energy vehicles. To ensure its long-term reliable operation, the core cavities of the three-electric system (such as the motor cavity and battery pack cavity) must have good sealing properties to prevent external moisture, dust, and other contaminants from intruding and causing internal insulation failure, short circuits, or corrosion. At the same time, because the three-electric system generates drastic temperature changes during operation, the internal gas expands and contracts due to thermal changes, resulting in significant pressure fluctuations. Excessive positive pressure may damage seals or cause housing deformation, while excessive negative pressure may draw in external moisture and dust.

[0004] To address the aforementioned pressure balance issue, existing technologies incorporate pressure balancing valves on the housings of the motor, controller, and battery pack. These primarily include vent valves and explosion-proof valves. Vent valves (typically employing ePTFE diaphragm structures) allow gas to pass slowly under minute pressure differences, achieving dynamic pressure balance between the internal and external components. Simultaneously, their microporous structure effectively blocks liquid water and particulate contaminants. Explosion-proof valves (including reversible and burst-proof types) rapidly open when the internal pressure surges to a dangerous threshold, providing large-scale pressure relief to prevent serious safety accidents such as housing explosions.

[0005] However, current vent valves and explosion-proof valves are considered passive mechanical components, lacking effective condition monitoring methods. The performance of vent valves gradually deteriorates over time due to pore blockage, aging, or physical damage. When a vent valve is blocked, its air permeability decreases, making it unable to effectively balance pressure and increasing the risk of sealing system failure. When a vent valve is damaged, its waterproof and dustproof functions are lost, allowing external environmental pollutants to easily enter the cavity, directly threatening the electrical insulation safety of the assembly.

[0006] Current technology cannot provide early warnings regarding the aforementioned valve body condition. It can only be detected after a serious malfunction occurs in the corresponding product (e.g., motor) (insulation failure, motor burnout), through disassembly for post-incident inspection, or during routine maintenance after the explosion-proof valve has activated. This passive, reactive maintenance approach cannot prevent cascading failures that may be triggered by pressure balancing valve failure, resulting in high maintenance costs and significant safety hazards.

[0007] Some resettable explosion-proof valves can automatically reset themselves after depressurization. However, there is currently a lack of effective technical means to record their historical opening events and cumulative opening counts. Repeated opening and resetting may lead to valve plate fatigue and decreased sealing performance, causing it to fail when it is needed again. The system is unaware of this potential risk, thus creating a safety hazard. Summary of the Invention

[0008] This invention provides a method and system for monitoring the operation of a vent valve, solving the problem that the status of vent valves / explosion-proof valves in the three-electric system cannot be monitored in real time. Through predictive maintenance, it avoids safety accidents such as insulation failure and pressure runaway caused by their performance degradation or damage, realizing the transformation from "passive maintenance" to "proactive early warning".

[0009] To achieve the above objectives, the present invention adopts the following technical solution: The first aspect of the present invention provides a method for monitoring the operation of a vent valve, applied to a cavity in a motor, battery, and / or electronic control system, the cavity being provided with a vent valve, a pressure sensor, and a temperature sensor, comprising the following steps: Obtain the current temperature T inside the cavity. n With current pressure P n ; The current air permeability rate is calculated based on the pressure change of the cavity during the cooling process. The ratio of the current air permeability rate to the rated air permeability rate is used as the first ratio coefficient KA. If the first ratio coefficient KA is lower than the first threshold k1, a first-level performance alarm is output. If the first ratio coefficient KA is lower than the second threshold k2, a second-level performance alarm is output. Wherein, k1>k2. Based on the current temperature T n Query the reference pressure-temperature correspondence to obtain the corresponding standard pressure P0, and then use the current pressure P... n The ratio of the standard pressure P0 to the standard pressure P0 is used as the second ratio coefficient KB. If the second ratio coefficient KB is lower than the third threshold k3 and continues for a first set accumulation time, a first-level status alarm is output. If the second ratio coefficient KB is lower than the fourth threshold k4 and continues for a second set accumulation time, a second-level status alarm is output. Wherein, k3>k4.

[0010] Furthermore, it also includes explosion-proof valve status monitoring steps: Monitor current pressure P n ; If the current pressure P n Exceeding the upper limit of the explosion-proof valve opening pressure P max If the second ratio coefficient KB is lower than the fourth threshold k4 for a continuous cumulative time, it is determined that the explosion-proof valve has completed one opening action, and the cumulative number of openings of the explosion-proof valve is incremented by one.

[0011] Furthermore, when the cumulative number of openings exceeds the set number N, a prompt to replace the explosion-proof valve will be output.

[0012] Furthermore, the rated permeability rate is obtained by: in a laboratory environment, with the vent valve fully assembled in the cavity, operating under different power conditions, measuring the pressure and temperature changes of the cavity during the cooling process, and calculating the rated permeability rate based on the ideal gas law.

[0013] Furthermore, the baseline pressure-temperature correspondence is obtained by: in a laboratory environment, with the vent valve of the cavity fully assembled, the equilibrium pressure inside the cavity is recorded by running at different temperatures, establishing a database of the mapping relationship between temperature and standard pressure P0, and determining the baseline pressure-temperature correspondence.

[0014] Furthermore, the first ratio coefficient KA is used to characterize the degree of degradation of the actual air permeability of the vent valve relative to its rated performance.

[0015] Furthermore, the second ratio factor KB is used to characterize the degree of deviation of the actual pressure inside the cavity from the standard pressure at a specific temperature, in order to indicate the leakage status of the vent valve.

[0016] A second aspect of the present invention provides a vent valve operation monitoring system, comprising: The signal acquisition module is configured to acquire the current temperature T inside the cavity. n With current pressure P n ; The performance monitoring module is configured to: calculate the current air permeability rate based on the pressure change of the cavity during the cooling process, and use the ratio of the current air permeability rate to the rated air permeability rate as the first ratio coefficient KA; if the first ratio coefficient KA is lower than the first threshold k1, then output a first-level performance alarm; if the first ratio coefficient KA is lower than the second threshold k2, then output a second-level performance alarm; where k1>k2. The status monitoring module is configured to: monitor the current temperature T. n Query the reference pressure-temperature correspondence to obtain the corresponding standard pressure P0, and then use the current pressure P... n The ratio of the standard pressure P0 to the standard pressure P0 is used as the second ratio coefficient KB. If the second ratio coefficient KB is lower than the third threshold k3 and continues for a first set accumulation time, a first-level status alarm is output. If the second ratio coefficient KB is lower than the fourth threshold k4 and continues for a second set accumulation time, a second-level status alarm is output. Wherein, k3>k4.

[0017] A third aspect of the present invention provides a controller that implements the above-described method for monitoring the operation of a vent valve.

[0018] A fourth aspect of the present invention provides an electronic device including at least one processor and a memory connected to the processor, the memory being used to store a computer program; the processor being used to execute the computer program, enabling the electronic device to implement the above-described method for monitoring the operation of a vent valve.

[0019] A fifth aspect of the present invention provides a motor vehicle including a motor, a battery and an electronic control system. The motor, battery and / or electronic control system have a cavity on which a vent valve, a pressure sensor and a temperature sensor are provided. The vent valve also has a processor that executes the steps in the above-described method for monitoring the operation of a vent valve.

[0020] Compared with existing technologies, one or more of the above technical solutions have the following beneficial effects: 1. By monitoring pressure and temperature in real time and performing intelligent diagnosis based on physical models, it can issue early warnings when the valve body performance deteriorates early or just breaks down, thereby eliminating potential safety hazards in their infancy and avoiding catastrophic failures.

[0021] 2. The overall process is not a traditional single monitoring system, but rather uses two independent paths: "ventilation rate judgment" and "pressure change judgment," which accurately correspond to the two main fault modes: ventilator blockage and ventilator damage, respectively. By introducing multi-level thresholds (k1, k2, k3, k4) and a time accumulation judgment mechanism, the severity level of the fault can be distinguished (such as "insufficient performance" and "replacement is necessary"), effectively preventing false alarms caused by instantaneous fluctuations in operating conditions, and improving the reliability and guidance value of the diagnostic results.

[0022] 3. For resettable explosion-proof valves, traditional solutions cannot determine whether they have been activated. This solution monitors peak pressure and reset status to automatically record the cumulative number of times the explosion-proof valve has been opened. When the number of openings exceeds the limit N, a replacement prompt is given, avoiding the potential explosion risk caused by valve fatigue failure and achieving predictive management of the lifecycle of safety components.

[0023] 4. Maintenance personnel can perform precise and efficient maintenance based on specific early warning information (such as "check the vent valve" or "replace the explosion-proof valve"), reducing unnecessary comprehensive disassembly and inspection, lowering the maintenance cost throughout the entire life cycle, and significantly improving the operational reliability of the three-electric system. Attached Figure Description

[0024] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0025] Figure 1This is a schematic diagram illustrating the changes in internal pressure and temperature of a motor over time at different temperatures, provided by one or more embodiments of the present invention. Figure 2 This is a schematic diagram of the process for determining the damage status of a vent valve according to one or more embodiments of the present invention. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0027] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0028] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0029] A vent valve is a passive pressure management device installed in the sealed cavity of a three-electric system (such as the motor, controller, and battery pack housing). Its core uses an ePTFE (expanded polytetrafluoroethylene) microporous membrane, which allows for slow, bidirectional gas flow under the influence of a slight pressure difference between the inside and outside of the cavity. This balances static pressure fluctuations caused by temperature changes, while its microporous properties effectively prevent the intrusion of liquid water and dust particles, thus combining the functions of "breathing" and "sealing."

[0030] An explosion-proof valve is an active safety device installed on a sealed cavity in a three-electric system. It is used to prevent a structural explosion of the cavity when the internal pressure rapidly rises to a dangerous threshold (usually much higher than the working pressure differential of the vent valve) due to faults such as thermal runaway or short-circuit arcing. This is achieved through the rapid opening or rupture of the valve body, allowing for large-scale instantaneous pressure relief. It mainly includes two types: reversible (automatically reset after pressure relief) and burst-proof (single-use).

[0031] As described in the background section, the three-electric system (i.e., drive motor, motor controller, and power battery) is the core power component of new energy vehicles. To ensure its long-term reliable operation, the core cavities of the three-electric system (such as the motor cavity and battery pack cavity) must have good sealing properties to prevent external moisture, dust, and other contaminants from intruding and causing internal insulation failure, short circuits, or corrosion. Simultaneously, because the three-electric system generates drastic temperature changes during operation, the internal gas expands and contracts due to thermal changes, resulting in significant pressure fluctuations. Excessive positive pressure may damage seals or cause housing deformation, while excessive negative pressure may draw in external moisture and dust.

[0032] To address the aforementioned pressure balance issues, the industry commonly incorporates pressure balancing valves on the housings of motors, controllers, and battery packs. These valves primarily include vent valves and explosion-proof valves. Vent valves (typically employing ePTFE diaphragm structures) allow gas to pass slowly under minute pressure differences, achieving dynamic pressure balance between the internal and external components. Simultaneously, their microporous structure effectively blocks liquid water and particulate contaminants. Explosion-proof valves (including reversible and burst-proof types) rapidly open when the internal pressure surges to a dangerous threshold, providing large-scale pressure relief to prevent serious safety accidents such as housing explosions.

[0033] However, current vent valves and explosion-proof valves are considered passive mechanical components, lacking effective condition monitoring methods. The performance of vent valves gradually deteriorates over time due to pore blockage, aging, or physical damage. When a vent valve is blocked, its air permeability decreases, making it unable to effectively balance pressure and increasing the risk of sealing system failure. When a vent valve is damaged, its waterproof and dustproof functions are lost, allowing external environmental pollutants to easily enter the cavity, directly threatening the electrical insulation safety of the assembly.

[0034] Current technology cannot provide early warnings regarding the aforementioned valve body condition. It can only be detected after a serious malfunction (such as insulation failure or motor burnout) has occurred, through post-incident visual inspection or during routine maintenance after the explosion-proof valve has activated. This reactive, reactive maintenance approach cannot prevent cascading failures that may be triggered by pressure balancing valve failure, resulting in high maintenance costs and significant safety hazards.

[0035] For resettable explosion-proof valves, they can automatically reset after depressurization. However, there is currently no technical means to record their historical opening events and cumulative opening counts. Repeated opening and resetting may lead to valve plate fatigue and decreased sealing performance, causing it to fail when it needs to operate again. The system is unaware of this potential risk, thus creating a safety hazard.

[0036] Therefore, this solution provides a method and system for monitoring the operation of a vent valve. By embedding a pressure sensor in the motor / battery cavity, and based on the gas state equation "PV=nRT", the pressure-temperature data is compared in real time with a health benchmark model established in the laboratory. By calculating the key performance coefficient (k value), the system can intelligently diagnose fault states such as blockage and damage of the vent valve and provide graded early warnings.

[0037] This solution adds a pressure sensor inside the motor to monitor the pressure value inside the motor cavity.

[0038] Since the internal space of the motor is a fixed value V0, according to the gas state equation PV=nRT, when the internal temperature rises or falls, assuming there is no gas exchange, the gas mass / number of molecules inside the cavity remains unchanged, and the pressure inside the cavity will increase or decrease accordingly.

[0039] With the vent valve present, the gas pressure inside and outside the cavity can be transmitted through the vent valve.

[0040] Durability tests were conducted on a "motor" equipped with a pressure sensor.

[0041] During product durability testing, the product was operated at different power levels, and the curves showing the changes in internal motor pressure and temperature over time at different temperatures were obtained, such as... Figure 1 As shown.

[0042] according to Figure 1 The motor gradually increased to its highest temperature T. max At that time, the maximum internal pressure is P. max .

[0043] When the vehicle equipped with the motor starts running, under static normal temperature conditions, the motor temperature is T1 and the internal pressure is P1. When the internal temperature of the motor rises to T2, the pressure in the corresponding cavity is P2. After time t0, the internal pressure of the motor will gradually decrease and stabilize at temperature T3, corresponding to a pressure of P3 in the cavity. Based on the gas law equations PV=nRT and ΔV=nR(T2-T3) / P, the permeability rate is calculated to be ΔV / t0.

[0044] By simulating breathable membranes under different conditions, the membranes are installed on the entire machine for testing during the experimental phase to obtain the product's air permeability rate under different conditions. Assuming k = measured air permeability rate / rated air permeability rate, k1 is defined as the alarm stage and k2 as the risk stage. Here, k is equivalent to the "first ratio coefficient KA".

[0045] During the actual operation of the product, the real-time air permeability rate was compared with the design parameters. If the current air permeability rate is less than the design value * k1, the air permeability performance of the air permeability valve is considered insufficient, and a warning is sent to the system. If the current air permeability rate is less than the design value * k2, it is assumed that the air permeability valve may be blocked or the air permeability membrane may have closed pores. The system prompts: Replace the air permeability valve.

[0046] In this scheme, the lower the air permeability rate, the more severe the blockage. Therefore, k1>k2.

[0047] By simulating breathable membranes under different lifespan conditions, the membranes were installed on the entire machine for testing during the experimental phase to obtain the pressure variation limits of the product under different conditions. The pressure value of the product just leaving the factory is P0. Assuming k = measured pressure value / rated pressure value, k3 is defined as the alarm stage and k4 as the risk stage. Here, k is equivalent to the "second ratio coefficient KB".

[0048] The lower the pressure ratio, the more serious the leakage; therefore, k3 > k4.

[0049] As the internal temperature of the motor continues to rise, the pressure sensor identifies the internal temperature and pressure. At temperature T... n Below, the current detection pressure is P. n Compared with laboratory test data, if pressure P n <k 3* P0 records the cumulative time; If the cumulative time is greater than t1, it is determined that the air permeability may be abnormal, and a warning is sent to the system: check the air permeability valve; If the pressure P n <k 4* P0 records the cumulative time t. If the cumulative time is greater than t2, the vent valve is determined to be damaged, and the system prompts: Replace the vent valve.

[0050] Furthermore, for reversible explosion-proof valves used in battery systems, when the maximum pressure inside the chamber exceeds the explosion-proof pressure limit P... max If subsequent pressure P n <k 4* P0 records the cumulative time t. If the cumulative time is greater than t5, the explosion-proof valve may have been opened. The system records the number of times the explosion-proof valve has been opened plus one. When the cumulative number exceeds N, the system is prompted to replace the explosion-proof valve.

[0051] Based on the above ideas, the following can be formed: Figure 2 The method for monitoring the operation of a vent valve, as shown, is applied to a cavity in a motor, battery, and / or electronic control system. The cavity is equipped with a vent valve, a pressure sensor, and a temperature sensor, and includes the following steps: Obtain the current temperature T inside the cavity. n With current pressure P n ; The current air permeability rate is calculated based on the pressure change of the cavity during the cooling process. The ratio of the current air permeability rate to the rated air permeability rate is used as the first ratio coefficient KA. If the first ratio coefficient KA is lower than the first threshold k1, a first-level performance alarm is output. If the first ratio coefficient KA is lower than the second threshold k2, a second-level performance alarm is output. Wherein, k1>k2. Based on the current temperature T n Query the reference pressure-temperature correspondence to obtain the corresponding standard pressure P0, and then use the current pressure P... n The ratio of the standard pressure P0 to the standard pressure P0 is used as the second ratio coefficient KB. If the second ratio coefficient KB is lower than the third threshold k3 and continues for a first set accumulation time, a first-level status alarm is output. If the second ratio coefficient KB is lower than the fourth threshold k4 and continues for a second set accumulation time, a second-level status alarm is output. Wherein, k3>k4.

[0052] As a further implementation method, an explosion-proof valve status monitoring step is also included: Monitor current pressure P n ; If the current pressure P n Exceeding the upper limit of the explosion-proof valve opening pressure P max If the second ratio coefficient KB is lower than the fourth threshold k4 for a continuous cumulative time, it is determined that the explosion-proof valve has completed one opening action, and the cumulative number of openings of the explosion-proof valve is incremented by one.

[0053] As a further implementation, when the cumulative number of openings exceeds a set number N, a prompt to replace the explosion-proof valve is output.

[0054] As a further implementation method, the rated permeability rate is obtained by: in a laboratory environment, with the vent valve fully assembled in the cavity, operating under different power conditions, measuring the pressure and temperature changes of the cavity during the cooling process, and calculating the rated permeability rate based on the ideal gas law.

[0055] As a further implementation method, the baseline pressure-temperature correspondence is obtained. Specifically, in a laboratory environment, the vent valve of the cavity is fully assembled. By operating at different temperatures and recording the equilibrium pressure inside the cavity, a database of the mapping relationship between temperature and standard pressure P0 is established to determine the baseline pressure-temperature correspondence.

[0056] As a further implementation, the first ratio coefficient KA is used to characterize the degree of degradation of the actual permeability of the vent valve relative to its rated performance.

[0057] As a further implementation, the second ratio coefficient KB is used to characterize the degree of deviation of the actual pressure inside the cavity from the standard pressure at a specific temperature, in order to indicate the leakage status of the vent valve.

[0058] In traditional solutions, the condition of vent valves / explosion-proof valves (such as micropore blockage or diaphragm damage) is invisible; the possible state can only be inferred from the consequences of eventual failure. This solution, however, utilizes the cavity itself as a "pressure vessel," converting the "valve health status" into precisely measurable "pressure-temperature time series data" through a pressure sensor, making the invisible performance degradation process visible. Combined with the fundamental ideal gas law (PV=nRT), and following the basic physical principle that "in a closed and leak-free cavity, temperature and pressure follow a strict correspondence," this correspondence ensures the reliability of the diagnostic logic.

[0059] Meanwhile, this solution establishes performance benchmarks (air permeability rate) and condition benchmarks (pressure-temperature curves) through experiments. The performance benchmark (air permeability rate) is used to detect slow performance degradation (such as blockage), while the condition benchmark (pressure-temperature curves) is used to detect sudden or severe failures (such as breakage). These two sets of benchmarks cover the entire life cycle of the component from early aging to final failure.

[0060] Furthermore, the judgment condition is not triggered instantaneously, but requires the abnormal state to last for a certain period of time (t1, t2, t5) or reach a certain cumulative number (N). By introducing the dimensions of "time" and "frequency", the fault tolerance and accuracy are improved, effectively avoiding false alarms caused by pressure signal jitter due to conditions such as vehicle wading through water and instantaneous overload, and greatly improving the reliability of the system.

[0061] In summary, this solution, by monitoring pressure and temperature in real time and performing intelligent diagnosis based on a physical model, can issue early warnings when valve body performance is in the early stages of decline or just beginning to break, thereby eliminating potential safety hazards in their infancy and avoiding catastrophic failures.

[0062] The overall process is not a single monitoring step, but rather utilizes two independent paths: "ventilation rate judgment" and "pressure change judgment," precisely corresponding to the two most common fault modes: ventilator blockage and ventilator damage. By introducing multi-level thresholds (k1, k2, k3, k4) and a time-cumulative judgment mechanism, the severity level of the fault can be distinguished (e.g., "insufficient performance" versus "replacement required"), effectively preventing false alarms caused by instantaneous fluctuations in operating conditions and improving the reliability and guiding value of the diagnostic results.

[0063] On the hardware side, only a mature pressure sensor needs to be added to the existing system, and an existing temperature sensor needs to be utilized. The core diagnostic functions are implemented through software algorithms. This can solve the "blind spot" problem that could lead to major safety accidents (such as insulation failure or motor burnout) at extremely low hardware cost.

[0064] Traditional solutions for resettable explosion-proof valves cannot determine whether they have been activated. This solution monitors pressure peaks and reset status to automatically record the cumulative number of times the explosion-proof valve has been opened. When the number of openings exceeds the limit N, a replacement prompt is given, avoiding the potential explosion risk caused by valve fatigue failure and achieving predictive management of the lifecycle of safety components.

[0065] It provides clear maintenance guidelines for OEMs and users. System maintenance personnel can perform precise and efficient maintenance based on specific warning information (such as "check the vent valve" or "replace the explosion-proof valve"), reducing unnecessary comprehensive disassembly and inspection, lowering the maintenance cost throughout the entire life cycle, and significantly improving the operational reliability of the three-electric system.

[0066] Accordingly, a vent valve operation monitoring system includes: The signal acquisition module is configured to acquire the current temperature T inside the cavity. n With current pressure P n ; The performance monitoring module is configured to: calculate the current air permeability rate based on the pressure change of the cavity during the cooling process, and use the ratio of the current air permeability rate to the rated air permeability rate as the first ratio coefficient KA; if the first ratio coefficient KA is lower than the first threshold k1, then output a first-level performance alarm; if the first ratio coefficient KA is lower than the second threshold k2, then output a second-level performance alarm; where k1>k2. The status monitoring module is configured to: monitor the current temperature T. n Query the reference pressure-temperature correspondence to obtain the corresponding standard pressure P0, and then use the current pressure P... n The ratio of the standard pressure P0 to the standard pressure P0 is used as the second ratio coefficient KB. If the second ratio coefficient KB is lower than the third threshold k3 and continues for a first set accumulation time, a first-level status alarm is output. If the second ratio coefficient KB is lower than the fourth threshold k4 and continues for a second set accumulation time, a second-level status alarm is output. Wherein, k3>k4.

[0067] Accordingly, a controller implements the steps in the above-mentioned method for monitoring the operation of a vent valve.

[0068] Accordingly, an electronic device includes at least one processor and a memory connected to the processor, the memory being used to store computer programs; the processor is used to execute the computer programs, enabling the electronic device to perform the steps in the above-described method for monitoring the operation of a vent valve.

[0069] Correspondingly, a motor vehicle includes a motor, a battery, and an electronic control system. The motor, battery, and / or electronic control system have a cavity, on which a vent valve, a pressure sensor, and a temperature sensor are provided. The vehicle also has a processor that executes the steps in the aforementioned vent valve operation monitoring method.

[0070] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for monitoring the operation of a vent valve, applied to a cavity in a motor, battery, and / or electronic control system, wherein the cavity is equipped with a vent valve, a pressure sensor, and a temperature sensor, characterized in that, Includes the following steps: Obtain the current temperature T inside the cavity. n With current pressure P n ; The current air permeability rate is calculated based on the pressure change of the cavity during the cooling process. The ratio of the current air permeability rate to the rated air permeability rate is used as the first ratio coefficient KA. If the first ratio coefficient KA is lower than the first threshold k1, a first-level performance alarm is output. If the first ratio coefficient KA is lower than the second threshold k2, a second-level performance alarm is output. Wherein, k1 > k2. Based on the current temperature T n Query the reference pressure-temperature correspondence to obtain the corresponding standard pressure P0, and then use the current pressure P... n The ratio of the standard pressure P0 to the standard pressure P0 is used as the second ratio coefficient KB. If the second ratio coefficient KB is lower than the third threshold k3 and continues for a first set accumulation time, a first-level status alarm is output. If the second ratio coefficient KB is lower than the fourth threshold k4 and continues for a second set accumulation time, a second-level status alarm is output. Wherein, k3 > k4.

2. The method for monitoring the operation of a vent valve as described in claim 1, characterized in that, It also includes the explosion-proof valve status monitoring steps: Monitor current pressure P n ; If the current pressure P n Exceeding the upper limit of the explosion-proof valve opening pressure P max If the second ratio coefficient KB is lower than the fourth threshold k4 for a continuous cumulative time, it is determined that the explosion-proof valve has completed one opening action, and the cumulative number of openings of the explosion-proof valve is incremented by one.

3. The method for monitoring the operation of a vent valve as described in claim 2, characterized in that, When the cumulative number of openings exceeds the set number N, a prompt to replace the explosion-proof valve will be output.

4. The method for monitoring the operation of a vent valve as described in claim 1, characterized in that, To obtain the rated permeability rate, specifically: in a laboratory environment, with the vent valve fully assembled in the cavity, the pressure and temperature changes of the cavity during the cooling process are measured by operating under different power conditions, and the rated permeability rate is calculated based on the ideal gas law.

5. The method for monitoring the operation of a vent valve as described in claim 1, characterized in that, To obtain the baseline pressure-temperature correspondence, specifically: in a laboratory environment, with the vent valve of the cavity fully assembled, the equilibrium pressure inside the cavity is recorded by operating at different temperatures, a database of the mapping relationship between temperature and standard pressure P0 is established, and the baseline pressure-temperature correspondence is determined.

6. The method for monitoring the operation of a vent valve as described in claim 1, characterized in that, The first ratio coefficient KA is used to characterize the degree of degradation of the actual air permeability of the vent valve relative to its rated performance.

7. The method for monitoring the operation of a vent valve as described in claim 1, characterized in that, The second ratio factor KB is used to characterize the degree of deviation of the actual pressure inside the cavity from the standard pressure at a specific temperature, in order to indicate the leakage status of the vent valve.

8. A vent valve operation monitoring system, applied to a cavity in a motor, battery, and / or electronic control system, wherein the cavity is equipped with a vent valve, a pressure sensor, and a temperature sensor, characterized in that, include: The signal acquisition module is configured to acquire the current temperature T inside the cavity. n With current pressure P n ; The performance monitoring module is configured to: calculate the current air permeability rate based on the pressure change of the cavity during the cooling process, and use the ratio of the current air permeability rate to the rated air permeability rate as the first ratio coefficient KA; if the first ratio coefficient KA is lower than the first threshold k1, then output a first-level performance alarm; if the first ratio coefficient KA is lower than the second threshold k2, then output a second-level performance alarm; where k1 > k2. The status monitoring module is configured to: monitor the current temperature T. n Query the reference pressure-temperature correspondence to obtain the corresponding standard pressure P0, and then use the current pressure P... n The ratio of the standard pressure P0 to the standard pressure P0 is used as the second ratio coefficient KB. If the second ratio coefficient KB is lower than the third threshold k3 and continues for a first set accumulation time, a first-level status alarm is output. If the second ratio coefficient KB is lower than the fourth threshold k4 and continues for a second set accumulation time, a second-level status alarm is output. Wherein, k3 > k4.

9. A controller, characterized in that, Implement the steps in the method for monitoring the operation of a vent valve as described in any one of claims 1-7.

10. A motor vehicle, characterized in that, The device includes a motor, a battery, and an electronic control system. The motor, battery, and / or electronic control system have a cavity on which a vent valve, a pressure sensor, and a temperature sensor are provided. The device also has a processor that executes the steps in the vent valve operation monitoring method as described in any one of claims 1-7.

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