A method and apparatus for evaluating the heating performance of heating elements for electrothermal film liquids.

Abstract

This invention discloses a method and apparatus for evaluating the heating performance of a heating element for electrothermal film liquid, relating to the field of heating element electrical variable measurement technology. The method includes: electrothermal film voltage switching evaluation, electrothermal film load characteristic measurement, and electrothermal film signal acquisition and monitoring. This invention obtains the electrothermal film voltage switching evaluation result by performing the evaluation; after the evaluation, it performs the electrothermal film load characteristic measurement result; and after the load characteristic measurement is deemed satisfactory, it performs electrothermal film signal acquisition and monitoring result. This improves the accuracy of the heating performance evaluation method for electrothermal film liquid heating elements and solves the problem of inaccurate heating performance evaluation in existing technologies.

Description

Technical Field

[0001] This invention relates to the field of electrical variable measurement technology for heating elements, and in particular to a method and apparatus for evaluating the heating performance of heating elements for electrothermal film liquids. Background Technology

[0002] In the evaluation of the heating performance of a heating element, such as a ceramic potted heating element, the heat source first transfers heat to the adhesive inside the hollow shell through two wires welded to its electrodes, and then conducts it to the outer shell of the heating element, such as ceramic, aluminum tube, or bipod. First, the temperature sensor NTC (Negative Temperature Coefficient) in the signal acquisition module is precisely controlled to a preset temperature environment on the heating film of the heating element. A specific voltage is then applied to the heating film to generate controllable electrothermal excitation. Next, the temperature change of the heating film is sensed by the NTC temperature sensor and output as an electrical signal. Finally, the signal is transmitted via an external control unit. The unit detects the electrical signal output by the NTC temperature sensor and applies different voltages to the heating film through the power management circuit. The sensitive element inside the NTC temperature sensor, which is based on resistance-temperature dependence, then generates a corresponding weak electrical signal. This weak electrical signal is then processed by the professional-grade pre-amplifier, filter, and cold junction compensation of the external control unit, converting the electrical signal into a thermal response signal. The collected thermal response signal is then mapped into precise temperature rise data through a preset calibration curve. By combining the temperature rise data collected by the thermal sensor, a power-temperature response model is constructed to obtain the electrothermal performance parameters of the heating element, which are used to evaluate the heating performance of the heating element, thereby achieving precise temperature control.

[0003] For example, the Chinese invention patent application with publication number CN119986131A discloses a heating element material testing device, method, and storage medium, which includes: acquiring test modes and test parameters; when a test command is received, performing initial resistance detection on the heating element material; when the heating element material passes the initial resistance detection, performing power calibration test and / or power-on test on the heating element material according to the test mode and test parameters, and displaying the test results.

[0004] For example, Chinese invention patent application CN101639500B discloses an indirect heating method for testing the high-temperature resistance of a carbon / carbon heating element, comprising the following steps: 1. Fixing a graphite heating element on a first electrode inside a resistance furnace; 2. Fixing one or more carbon / carbon heating elements around the graphite heating element; 3. Connecting a set of positive and negative electrodes to each end of the carbon / carbon heating element, leading from inside the furnace to outside; 4. Clamping the measuring clips of a Kelvin bridge onto the corresponding set of positive and negative electrodes; 5. Introducing a protective gas into the resistance furnace; 6. Indirectly heating the carbon / carbon heating element by energizing the graphite heating element, continuously recording the temperature of the carbon / carbon heating element and the resistance value between the corresponding positive and negative electrodes measured by the Kelvin bridge during heating, and plotting the rate of change curve of the resistance value of the carbon / carbon heating element from room temperature to high temperature.

[0005] The above-mentioned technology has at least the following technical problems:

[0006] In existing technologies, as battery power gradually decreases, in order to maintain the power of the heating element, the power management circuit may compensate by increasing the PWM (Pulse Width Modulation) modulation frequency or switching different voltage levels. Since the heating film is a resistive load, it will respond to voltage fluctuations in real time, resulting in frequent changes in the output electrical signal. If the sampling pulse or filtering design of the signal acquisition module is insufficient, it will cause a mismatch between the sampling pulse and the frequency of electrical signal changes during power monitoring. This will result in incomplete current, voltage, and power data collected by the signal acquisition module (such as ammeter, voltmeter, and power meter). Consequently, the power-temperature response model constructed by combining the temperature rise data obtained by the temperature sensor with the current, voltage, and power data will be inaccurate. This will further lead to inaccurate evaluation of the heating performance of the heating element based on the obtained power-temperature response model, thus resulting in the problem of inaccurate evaluation of the heating performance of the heating film heating element. Summary of the Invention

[0007] To address the technical problem of inaccurate evaluation of the heating performance of heating elements for electrothermal film liquids in existing technologies, this invention provides a method for evaluating the heating performance of heating elements for electrothermal film liquids. The technical solution is as follows:

[0008] On the one hand, a method for evaluating the heating performance of a heating element for electrothermal film liquid is provided, including the following steps:

[0009] During the heating performance evaluation of the heating element, an electrothermal film voltage switching evaluation is performed to obtain evaluation results reflecting the pass rate of the electrothermal film voltage switching. Based on the obtained evaluation results, it is determined whether to perform electrothermal film voltage switching optimization. Optimization includes: phase alignment operation to improve the pass rate of the electrothermal film voltage switching phase alignment and noise adjustment to reduce electrothermal film voltage switching noise interference. The electrothermal film refers to the functional element in the heating element that generates heat. After the electrothermal film voltage switching evaluation is completed, an electrothermal film load characteristic measurement is performed to obtain results reflecting the pass rate of the electrothermal film load characteristics. The results of the electrothermal film load characteristic measurement are used to determine whether to perform load characteristic stabilization operations. Load characteristic stabilization operations are performed to ensure the stability of the electrothermal film load and improve the accuracy of electrothermal film load monitoring. After the electrothermal film load characteristic measurement is qualified, electrothermal film signal acquisition and monitoring are performed to obtain electrothermal film signal acquisition and monitoring results that reflect the qualification level of electrothermal film signal acquisition and monitoring, and to determine whether they meet the qualification conditions of electrothermal film signal acquisition and monitoring. If they meet the conditions, the heating performance of the heating element is evaluated. Otherwise, the electrothermal film signal acquisition optimization is performed to improve the stability of electrothermal film electrical signal acquisition.

[0010] On the other hand, a heating device for electrothermal film liquid is provided, which is applied as a method for evaluating the heating performance of an electrothermal film liquid heating element, including: a cover, a plug-in assembly, a heating element assembly, a base, a circuit board, and a button; the cover covers the heating element assembly, the base, and the circuit board, and is used to conduct the heat energy of the heating element assembly; the plug-in assembly is used to connect the power supply to provide electrical energy to the heating element; the heating element assembly includes: a plastic bracket, an electrothermal film, an NTC probe, and a power cord; the plastic bracket makes point contact with the electrothermal film to fix the electrothermal film; the electrothermal film is inserted into the plastic bracket in a ring shape to convert the received electrical energy into heat energy; the NTC probe is installed on the surface of the ring-shaped electrothermal film to collect the temperature of the electrothermal film in real time; the power cord connects the electrothermal film and the plug-in assembly to transmit electrical energy; the base is used to fix the plug-in assembly, the heating element assembly, the circuit board, and the button above; the circuit board is used to receive the electrothermal film electrical signal acquired by the NTC probe, analyze it, and control the heating and cooling of the electrothermal film; the button is used to control the opening and closing of the electrothermal film liquid heating element.

[0011] The beneficial effects of the technical solutions provided in the embodiments of the present invention include at least the following:

[0012] 1. By performing an evaluation of the electrothermal film voltage switching, the results are obtained. Based on these results, it is determined whether to optimize the voltage switching. This helps to accurately assess the voltage switching situation, improve the stability of the voltage switching, reduce inaccurate electrical signal acquisition caused by switching noise, and ensure the accuracy of the voltage switching frequency to improve the stability of the heating element. 2. By performing a load characteristic measurement of the electrothermal film, the results are obtained. Based on these results, it is determined whether to perform load characteristic stabilization operations. This helps to accurately assess the load characteristics of the electrothermal film and improve its operational stability. To ensure the qualification of the work, and to avoid incomplete acquisition of the electric signal of the electric heating film due to rapid changes in the load characteristics of the electric heating film, the reliability of the electric signal of the electric heating film is ensured, thereby improving the accuracy of the heating element's operation. By performing electric heating film signal acquisition and monitoring, the results of the electric heating film signal acquisition and monitoring are obtained. Based on the acquired results, it is determined whether the electric heating film signal acquisition and monitoring meets the qualification conditions. This helps to accurately assess the qualification level of the electric heating film signal acquisition and monitoring, improve the accuracy of the electric heating film signal acquisition, reduce the incomplete acquisition of the electric heating film signal due to rapid changes in the frequency of the electric signal, ensure the qualification of the electric heating film signal acquisition, and thus improve the accuracy of the evaluation of the heating performance of the electric heating film liquid heating element.

[0013] 2. By harmonic averaging the results of the resistance change of the heating film and the frequency change of the electrical signal, a measurement result of the heating film load characteristics reflecting the qualification of the heating film load characteristics is obtained. Compared with the prior art, since the heating film is a resistive load, it will respond to voltage fluctuations in real time, resulting in frequent changes in the output electrical signal, which leads to inaccurate acquisition of the heating film electrical signal. The present invention helps to improve the stability of the heating film load characteristic changes by harmonic averaging, reduces the high-frequency noise and fluctuations in the heating film electrical signal, ensures that the heating film load characteristic changes are qualified, and thus increases the reliability and accuracy of the heating film electrical signal output.

[0014] 3. By harmonic averaging the electrical signal timing offset and the load characteristics of the heating film, a signal acquisition and monitoring result reflecting the qualification of the heating film signal acquisition and monitoring is obtained. Compared with the prior art, due to insufficient sampling pulse or filtering design of the signal acquisition module, the sampling pulse and the frequency of electrical signal change during power monitoring will be mismatched, resulting in incomplete current, voltage and power data acquired by the signal acquisition module. The present invention helps to improve the anti-interference ability of the heating film electrical signal during the acquisition process by harmonic averaging, thereby improving the integrity of the heating film electrical signal acquisition, ensuring the stability of the heating film electrical signal acquisition, and thus improving the accuracy of the heating performance evaluation of the heating element. Attached Figure Description

[0015] Figure 1A flowchart illustrating a method for evaluating the heating performance of a heating element for electrothermal film liquid, provided in an embodiment of this application;

[0016] Figure 2 A schematic diagram of the architecture of a method for evaluating the heating performance of a heating element for electrothermal film liquid provided in an embodiment of this application;

[0017] Figure 3 A schematic diagram of the framework for optimizing the voltage switching of an electrothermal film in a method for evaluating the heating performance of an electrothermal film liquid heating element provided in an embodiment of this application;

[0018] Figure 4 This is a schematic diagram of a device for evaluating the heating performance of a heating element for an electrothermal film liquid, provided in an embodiment of this application.

[0019] Figure 5 This is a schematic diagram of the heating element assembly structure of a heating element performance evaluation device for electrothermal film liquid provided in an embodiment of this application;

[0020] Figure 6 This is a schematic diagram of the electrothermal film structure of a heating element for evaluating the heating performance of an electrothermal film liquid, provided in an embodiment of this application.

[0021] Figure 7 A heating element input power-heating element temperature curve is provided for a heating element heating performance evaluation method for electrothermal film liquid provided in an embodiment of this application.

[0022] Figure 8 A heating element input power-heating element power consumption curve is provided for a heating element heating performance evaluation method for electrothermal film liquid provided in an embodiment of this application.

[0023] Figure 9 The heating element input power-heat curve is shown in the embodiment of this application for evaluating the heating performance of a heating element for an electrothermal film liquid. Detailed Implementation

[0024] The technical solution of the present invention will now be described with reference to the accompanying drawings.

[0025] In embodiments of the present invention, words such as "exemplarily," "for example," etc., are used to indicate that something is an example, illustration, or description. Any embodiment or design described as "exemplary" in the present invention should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of the word "exemplary" is intended to present the concept in a concrete manner. Furthermore, in embodiments of the present invention, the meaning expressed by "and / or" can be both, or either one.

[0026] In the embodiments of this invention, the terms "image" and "picture" may sometimes be used interchangeably. It should be noted that, without emphasizing the distinction between them, they convey the same meaning. Similarly, the terms "of," "corresponding (relevant)," and "corresponding" may sometimes be used interchangeably. It should be noted that, without emphasizing the distinction between them, they convey the same meaning.

[0027] To make the technical problems, technical solutions and advantages of the present invention clearer, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0028] This invention provides a method for evaluating the heating performance of a heating element for electrothermal film liquid, such as... Figure 1 The flowchart shown is a method for evaluating the heating performance of a heating element for an electrothermal film liquid, including the following steps:

[0029] Electric heating film voltage switching assessment: Perform an electric heating film voltage switching assessment to obtain the assessment results. Based on the obtained assessment results, determine whether the electric heating film voltage switching qualification conditions are met and whether electric heating film voltage switching optimization is needed. If it meets the conditions, perform electric heating film signal acquisition and monitoring; otherwise, perform electric heating film voltage switching optimization. Performing an electric heating film voltage switching assessment helps to accurately evaluate the electric heating film voltage switching status, ensure the accuracy of the electric heating film voltage switching frequency, and thus improve the stability of the heating element's operation.

[0030] Electric heating film load characteristic measurement: Perform electric heating film load characteristic measurement to obtain the measurement results. Based on the obtained results, determine whether the electric heating film load characteristic measurement meets the qualification conditions and whether to perform load characteristic stabilization operation. If it meets the conditions, perform electric heating film signal acquisition and monitoring; otherwise, perform load characteristic stabilization operation. Performing electric heating film load characteristic measurement helps to accurately measure the electric heating film load characteristics, ensure the reliability of the electric heating film electrical signal, and thus improve the accuracy of the heating element's operation.

[0031] Electrothermal film signal acquisition and monitoring: Perform electrothermal film signal acquisition and monitoring to obtain the results and determine whether they meet the qualification conditions. If they do, proceed with the evaluation of the heating performance of the heating element; otherwise, optimize the electrothermal film signal acquisition. By performing electrothermal film signal acquisition and monitoring, we can accurately measure the qualification level of the electrothermal film electrical signal acquisition and monitoring, ensure the qualification of the electrothermal film electrical signal acquisition, and thus improve the accuracy of the evaluation of the heating performance of the heating element for electrothermal film liquid.

[0032] like Figure 2The diagram shown is a schematic of the architecture of a method for evaluating the heating performance of a heating element for an electrothermal film liquid according to an embodiment of this application. First, an electrothermal film voltage switching evaluation is performed. It is then determined whether the evaluation result meets the acceptable conditions for electrothermal film voltage switching. If it does, electrothermal film signal acquisition and monitoring are performed; otherwise, electrothermal film voltage switching optimization is performed. Next, it is determined whether the re-acquired evaluation result after optimization meets the acceptable conditions for electrothermal film voltage switching. If it does, electrothermal film signal acquisition and monitoring are performed; otherwise, electrothermal film load characteristic measurement is performed. Finally, it is determined whether the electrothermal film load characteristic measurement result meets the acceptable conditions for electrothermal film load characteristic measurement. If it does, electrothermal film signal acquisition and monitoring are performed; otherwise, load characteristic stabilization is performed. The system performs a load characteristic stabilization operation and then determines whether the re-acquired load characteristic measurement results of the heating film meet the qualified conditions for load characteristic measurement. If they do, it performs heating film signal acquisition and monitoring; otherwise, it sends an abnormal load characteristic stabilization operation prompt to the preset personnel. Finally, it performs heating film signal acquisition and monitoring and determines whether the heating film signal acquisition results meet the qualified conditions for heating film signal acquisition and monitoring. If they do, it performs heating element heating performance evaluation; otherwise, it performs heating film signal acquisition optimization and determines whether the re-acquired heating film signal acquisition and monitoring results after optimization meet the qualified conditions for heating film signal acquisition and monitoring. If they do, it performs heating element heating performance evaluation; otherwise, it sends an abnormal heating film signal acquisition optimization prompt to the preset personnel.

[0033] It should be added that, before designing the heating performance evaluation method for the heating element of the electrothermal film liquid in this application, a database storing various setting data is established. The database includes, but is not limited to, preset electrothermal film voltage switching evaluation results, preset electrothermal film voltage switching frequency, preset electrothermal film load characteristic measurement results, etc., and the various values ​​are directly set by technicians.

[0034] In this embodiment, an electrothermal film voltage switching evaluation is performed to obtain the evaluation result, which is used to measure the stability of the electrothermal film voltage switching to improve the reliability of the power management circuit in compensating for switching different voltage levels. After the electrothermal film voltage switching optimization fails, an electrothermal film load characteristic measurement is performed to obtain the measurement result, which is used to measure the passability of the change in electrothermal film load characteristics to reduce the fluctuation of instantaneous response voltage and output electrical signal. Finally, after the electrothermal film load characteristic measurement is qualified, an electrothermal film signal acquisition and monitoring is performed to obtain the measurement result and determine whether to perform a heating element heating performance evaluation, which is used to measure the accuracy of the electrothermal film signal acquisition to improve the matching degree between the sampling pulse and the electrical signal change frequency, thereby improving the accuracy of the heating performance evaluation of the electrothermal film liquid heating element.

[0035] Furthermore, the specific process for determining whether to optimize the electric heating film voltage switching based on the obtained evaluation results is as follows: The evaluation results are obtained by quantifying the ratio between the electric heating film voltage stability and the preset electric heating film voltage stability, i.e., by calculation. The preset electric heating film voltage stability is represented by the average value of the electric heating film voltage stability over a historical time period. Based on the obtained evaluation results, it is determined whether the electric heating film voltage switching qualification conditions are met. The electric heating film voltage stability is represented by the ratio quantified between the preset electric heating film voltage switching frequency and the switching frequency of the electric heating film voltage at the preset electric heating film voltage input terminal during the preset electric heating film voltage switching evaluation time period monitored by a high-precision oscilloscope. This ratio reflects the electric heating film voltage switching frequency. The pass / fail rating is determined by the following criteria: the preset voltage switching frequency of the heating film is represented by the average switching frequency of the heating film voltage over a historical period; the preset voltage switching evaluation period is a pre-set time period corresponding to the voltage switching evaluation; the pass / fail condition for the heating film voltage switching is that the voltage switching evaluation result is greater than the preset voltage switching evaluation result, which is represented by the average value of the voltage switching evaluation results over a historical period; if the voltage switching evaluation result meets the pass / fail condition, the heating film signal acquisition and monitoring are performed; otherwise, voltage switching optimization is performed; voltage switching optimization indicates the optimization to be performed in the next voltage switching evaluation.

[0036] In this embodiment, by performing an evaluation of the electrothermal film voltage switching, the pass rate of the electrothermal film voltage switching can be effectively assessed, ensuring the transient characteristics and steady-state accuracy of the voltage. This provides a stable voltage basis for the acquisition of electrothermal film electrical signals, thereby improving the instantaneous stability and long-term accuracy of the electrothermal film electrical signals, ensuring the quality of the subsequently acquired electrothermal film electrical signals, and thus improving the stability and accuracy of the electrothermal film electrical signals.

[0037] Furthermore, the specific process for optimizing the electrothermal film voltage switching is as follows: Phase alignment of the switching voltage is performed: Based on a CPLD (Complex Programmable Logic Device), the phase of the electrical signal corresponding to the electrothermal film voltage converted by an AD (Analog-to-Digital Converter) is mapped within a preset phase range. Electrothermal film noise is adjusted using an averaging filter. This noise adjustment involves progressively increasing the window moving average length by a step size corresponding to the amplitude of a preset window moving average length. Progressively increasing the window moving average length helps preserve the details of the electrothermal film electrical signal, thereby achieving noise suppression. The window moving average length is monitored by a programmable logic controller. The preset window moving average length ratio is obtained by inputting the electrothermal film voltage switching evaluation results and the average voltage value into a moving average length mapping set. The moving average length mapping set reflects the electrothermal film voltage switching evaluation results and the average voltage value, and is correlated with the corresponding preset window moving average length. The mapping relationship between the average length ratios can quickly and accurately determine the most suitable data smoothing parameters for the current heating element operation based on real-time operating data of the heating film, such as voltage switching evaluation results and average voltage values, thereby improving the stability control and state optimization of the heating element operation. The moving length average mapping set is a mapping set pre-set by personnel based on historical experience to filter out the voltage switching noise of the heating film step by step. The average voltage value is represented by the average value of the instantaneous voltage at both ends of the heating film during the preset voltage switching evaluation period monitored by a voltmeter. If the voltage switching evaluation result of the heating film obtained again after voltage switching optimization meets the qualified conditions of the heating film voltage switching, then the heating film signal acquisition and monitoring is performed; otherwise, the heating film load characteristic measurement is performed.

[0038] It should be added that, such as Figure 3 The diagram shows a framework for optimizing the voltage switching of an electrothermal film liquid heating element, as provided in an embodiment of this application. The process involves optimizing the voltage switching of the electrothermal film, evaluating its performance, and determining whether the evaluation result meets the acceptable conditions. If it does, the process involves electrothermal film signal acquisition and monitoring; otherwise, it involves optimizing the voltage switching. The optimization includes performing voltage phase alignment and adjusting the noise of the electrothermal film. The process also involves determining whether the re-acquired voltage switching evaluation result after optimization meets the acceptable conditions. If it does, the process involves electrothermal film signal acquisition and monitoring; otherwise, it involves measuring the load characteristics of the electrothermal film.

[0039] In this embodiment, optimizing the voltage switching of the electrothermal film helps to reduce the introduction of noise, improve the suppression effect of voltage switching noise, reduce the impact of noise spikes on voltage switching, reduce the loss and distortion of electrothermal film electrical signal characteristics caused by excessive filtering, improve the signal-to-noise ratio of the electrothermal film electrical signal, ensure the accuracy and stability of subsequent electrothermal film electrical signal acquisition, and improve the reliability and consistency of the electrothermal film electrical signal.

[0040] Furthermore, the specific process for measuring the load characteristics of the electrothermal film is as follows: The results of the electrothermal film load characteristic measurement are obtained by harmonic averaging the results of the electrothermal film resistance change and the electrical signal frequency change. When current passes through the heating element electrothermal film to generate Joule heat, the temperature increase leads to intensified vibration of the electrothermal film's metal lattice, increasing the probability of free electron scattering. The electrothermal film resistance increases with temperature, meaning the change in electrothermal film resistance increases. Increased resistance leads to a lower cutoff frequency, resulting in faster attenuation of the high-frequency components of the electrothermal film's electrical signal, which in turn means a higher electrical signal frequency change. Based on the obtained electrothermal film load characteristic measurement... The result is used to determine whether the heating film load characteristic measurement meets the qualification criteria. If the heating film load characteristic measurement result meets the qualification criteria, then heating film signal acquisition and monitoring are performed; otherwise, load characteristic stabilization is performed. The qualification criteria for heating film load characteristic measurement indicate that the heating film load characteristic measurement result is greater than the preset heating film load characteristic measurement result, which is represented by the average value of heating film load characteristic measurement results over a historical period. The heating film resistance change result is quantified by proportionally comparing the preset heating film resistance change rate with the heating film resistance change rate, and then used to reflect the heating... The resistance control rate, which assigns weights to the effect of membrane resistance change on the electrothermal film load characteristic measurement results, is used to represent the degree of passability of the electrothermal film resistance change. The preset electrothermal film resistance change rate is represented by the average of the electrothermal film resistance change rates over a historical time period. The electrothermal film resistance change rate is also represented by the difference between the electrothermal film resistance value at the end point and the beginning point of the preset electrothermal film load characteristic measurement time period, as monitored by an ohmmeter. The preset electrothermal film load characteristic measurement time period represents the preset time period corresponding to the personnel performing the electrothermal film load characteristic measurement. (Telecommunications) The frequency change result is quantified by proportionally comparing the preset frequency change of the electric heating film's electrical signal with the preset frequency change of the electric heating film's electrical signal. This is combined with the signal change regulation rate, which reflects the degree of influence of the frequency change result on the measurement result of the electric heating film's load characteristics, to reflect the pass rate of the electric heating film's electrical signal frequency change. The frequency change of the electric heating film's electrical signal is represented by the difference between the electric heating film's electrical signal frequency at the end point and the electric heating film's electrical signal frequency at the beginning point of the preset electric heating film load characteristic measurement time period, as monitored by an oscilloscope. The preset frequency change of the electric heating film's electrical signal is represented by the average value of the electric heating film's electrical signal frequency change over a historical time period.

[0041] It should be added that the results of the change in resistance of the electrothermal film and the change in frequency of the electrical signal are respectively input into the mapping set. The results of the change in resistance of the electrothermal film and the change in frequency of the electrical signal are normalized based on a data normalization algorithm. The electromagnetic interference intensity is then input into a linear regression model along with the normalized results of the change in resistance of the electrothermal film and the change in frequency of the electrical signal. A linear regression algorithm is used to fit the model and obtain the corresponding resistance control rate and signal change control rate. Finally, the ranges of the electromagnetic interference intensity, the change in resistance of the electrothermal film, and the change in frequency of the electrical signal are mapped to a preset interval, which is pre-set by a predetermined group of personnel, thus establishing the mapping set. In this embodiment, the values ​​of the resistance control rate and the signal change control rate are both in the range of 0 to 1. Since a greater electromagnetic interference intensity means a stronger noise electromagnetic field acting on the conductive film, it will induce eddy currents inside the material, generating disordered circular currents that produce additional Joule heat, causing a local temperature increase. This means a greater change in the resistance of the electrothermal film. It will also form an equivalent parallel loss resistance, leading to a greater change in the phase shift of the total impedance, which in turn leads to a higher frequency of the generated electrothermal film electrical signal, meaning a higher frequency of the electrical signal.

[0042] In this embodiment, by performing an electrothermal film load characteristic measurement, the pass rate of the electrothermal film load characteristics can be effectively evaluated, ensuring the validity and reliability of the collected electrothermal film electrical signals, reducing the distortion or measurement error of the electrothermal film electrical signals caused by the mismatch of the electrothermal film load characteristics, ensuring the validity of the electrothermal film electrical signal acquisition, and making the collected electrothermal film electrical signals truly reflect the actual working state of the heating element, thereby improving the instantaneous quality of the electrothermal film electrical signals and the long-term consistency of the electrothermal film electrical signal acquisition.

[0043] Furthermore, the specific process for maintaining load characteristics is as follows: Based on the particle swarm optimization algorithm, the electrical signal acquisition frequency resolution is adjusted by progressively increasing the resolution step size, with the amplitude corresponding to the preset acquisition frequency resolution ratio as the adjustment step size. Progressively increasing the electrical signal acquisition frequency resolution helps improve the accuracy of detecting changes in the electrothermal film load characteristics. The electrical signal acquisition frequency resolution is monitored using an oscilloscope, thereby improving the accuracy of the electrothermal film's electrical signal acquisition. The electrical signal acquisition frequency resolution is greater than the preset minimum electrical signal acquisition frequency resolution. The preset acquisition frequency resolution ratio is obtained by inputting the electrothermal film load characteristic measurement results and the original electrical signal acquisition frequency resolution into the electrical signal acquisition mapping set. The electrical signal acquisition mapping set is then processed by... The system continuously verifies the results of the electrothermal film load characteristic measurement and the original electrical signal acquisition frequency resolution based on a linear regression algorithm. The preset minimum electrical signal acquisition frequency resolution is pre-set by a pre-defined team. The electrical signal acquisition mapping set reflects the mapping relationship between the electrothermal film load characteristic measurement results, the original electrical signal acquisition frequency resolution, and the corresponding preset acquisition frequency resolution. Adjusting the electrical signal acquisition frequency resolution is used to increase the electrical signal acquisition frequency and improve the monitoring accuracy of the electrothermal film load characteristics. If the electrothermal film load characteristic measurement results re-acquired after load characteristic stabilization operations meet the qualified conditions for electrothermal film load characteristic measurement, then electrothermal film signal acquisition monitoring is performed; otherwise, an abnormal load characteristic stabilization operation prompt is sent to the pre-defined team.

[0044] In this embodiment, by performing electrothermal film signal acquisition and monitoring, the pass rate of electrothermal film signal acquisition and monitoring can be effectively evaluated, which helps to improve the reliability of electrothermal film signal acquisition, reduce interference caused by timing distortion or state mismatch during electrothermal film signal acquisition, thereby effectively reducing the impact of sampling timing jitter and synchronization error on the integrity of electrothermal film signal, and ensuring the accuracy and consistency of electrothermal film signal acquisition.

[0045] Furthermore, the specific process for performing electrothermal film signal acquisition and monitoring is as follows: Based on the acquired electrothermal film signal acquisition and monitoring results, it is determined whether the electrothermal film signal acquisition and monitoring qualification conditions are met; the qualification conditions for electrothermal film signal acquisition and monitoring indicate that the electrothermal film signal acquisition and monitoring results are greater than the preset electrothermal film signal acquisition and monitoring results, which are represented by the average value of the electrothermal film signal acquisition and monitoring results over a historical time period; if the electrothermal film signal acquisition and monitoring results meet the qualification conditions for electrothermal film signal acquisition and monitoring, the heating performance of the heating element is evaluated; otherwise, the electrothermal film signal acquisition is optimized.

[0046] In this embodiment, performing electrothermal film signal acquisition and monitoring helps to accurately assess the qualification of electrothermal film signal acquisition, ensure the authenticity and integrity of electrothermal film signal, thereby improving the signal-to-noise ratio and clarity of electrothermal film signal, effectively reducing random jitter and fixed deviation of sampling trigger point, thereby reducing the phase offset of electrothermal film signal, and ensuring the accuracy of subsequent electrothermal film signal acquisition in the time dimension.

[0047] Furthermore, the specific acquisition process of the electrothermal film signal acquisition and monitoring results is as follows: A signal timing offset index is obtained by quantifying the ratio of a preset electrical signal timing offset to the actual electrical signal timing offset, reflecting the degree of compliance of the electrical signal timing offset. The signal timing offset index is then combined with a timing offset rate, which reflects the effect of the electrical signal timing offset on the electrothermal film signal acquisition and monitoring results, to obtain a signal timing offset result reflecting the degree of compliance of the electrothermal film electrical signal phase. Finally, the signal timing offset result and the electrothermal film load characteristic measurement index are harmonicly averaged to obtain the electrothermal film signal acquisition and monitoring results. Because the lower the battery charge, the faster the electrothermal film load characteristics change, the inductive reactance component generated by electromagnetic dumping also changes accordingly, causing the electrothermal film... The more electrical signals collected, the greater the delay in the electrothermal film sampling, resulting in a larger electrical signal timing offset. The electrical signal timing offset is represented by the average difference between the sampling trigger point time and the preset sampling point time during the preset electrothermal film signal acquisition monitoring period, monitored by the clock module. The sampling point time is preset by the personnel. The electrothermal film load characteristic measurement index is represented by the result of weighted processing of the qualified electrothermal film load characteristic measurement result and the load characteristic regulation rate, which reflects the degree of influence of the electrothermal film load characteristic measurement index on the electrothermal film signal acquisition monitoring result. This index is used to reflect the changes in the electrothermal film load characteristics. The qualified electrothermal film load characteristic measurement result is represented by the electrothermal film load characteristic measurement result corresponding to the qualified electrothermal film load characteristic measurement conditions.

[0048] It should be added that the electrical signal timing offset result and the electrothermal film load characteristic measurement index are respectively input into the mapping set. The mapping set is a result representation constructed by preset personnel through preset mapping relationship to map the electrical signal timing offset result and the electrothermal film load characteristic measurement index to the corresponding timing offset rate and load characteristic control rate. In this embodiment, the values ​​of timing offset rate and load characteristic control rate are both in the range of 0 to 1.

[0049] In this embodiment, by acquiring the monitoring results of the electrothermal film signal acquisition, the various factors affecting the qualification level of the electrothermal film signal acquisition and monitoring can be accurately reflected. This helps to improve the reliability of the electrothermal film signal acquisition, reduce the interference caused by timing distortion or state mismatch during the electrothermal film signal acquisition process, and thus effectively reduce the impact of sampling timing jitter and synchronization error on the integrity of the electrothermal film signal, ensuring the accuracy and consistency of the electrothermal film signal acquisition.

[0050] Furthermore, the specific process for optimizing the electrothermal film signal acquisition is as follows: Noise denoising of the electrothermal film signal is performed, using wavelet filtering to remove noise from the electrothermal film signal during acquisition; this noise denoising reduces interference in the electrothermal film signal acquisition, improving its accuracy; electrothermal signal acquisition processing involves adjusting the reference frequency based on the difference between the reference frequency in the phase-locked loop and the electrothermal film signal acquisition frequency; this adjustment involves progressively increasing the electrothermal film reference frequency by a step size corresponding to a preset reference frequency ratio; progressively increasing the reference frequency helps improve the synchronization of the electrothermal film signal acquisition, thereby increasing the quality of the acquisition; the reference frequency is monitored using an oscilloscope, and the preset reference frequency ratio... For example, the results of the electrothermal film signal acquisition and monitoring, along with the electrical signal sampling pulses, are input into a reference frequency mapping set. This reference frequency mapping set represents a set obtained by pre-set personnel through continuous verification of the relationship between the electrothermal film signal acquisition and monitoring results and the ratio of the electrical signal sampling pulses to a pre-set reference frequency using a linear regression algorithm. By driving the reference frequency in the phase-locked loop, the electrothermal film electrical signal acquisition frequency is dynamically adapted, ultimately achieving real-time synchronization and stable control of the electrothermal film electrical signal acquisition. Electrical signal acquisition processing is performed to reduce trigger point timing errors and decrease electrical signal timing offset. If the electrothermal film signal acquisition and monitoring results obtained after optimization meet the qualified conditions for electrothermal film signal acquisition and monitoring, a heating element heating performance evaluation is performed; otherwise, an abnormal electrothermal film signal acquisition optimization prompt is sent to the pre-set personnel.

[0051] In this embodiment, optimizing the acquisition of electrothermal film signals helps improve the accuracy of the sampling timing of electrothermal film electrical signals, ensures the authenticity and timeliness of electrothermal film electrical signals, reduces the inaccuracy of electrical signals caused by interference from the original characteristics of electrothermal film electrical signals, eliminates non-stationary noise components in electrical signals, thereby improving the clarity of electrical signals, increasing the accuracy of the phase of electrothermal film electrical signals, and thus improving the qualification of electrothermal film electrical signal acquisition.

[0052] Furthermore, the specific process for evaluating the heating performance of the heating element is as follows: The input power of the heating element is input into the constructed power-temperature response model to obtain the ideal temperature of the heating element. The specific construction process of the power-temperature response model is as follows: Key feature dimensions of the heating element's input power and temperature are extracted using a regression algorithm. The temporal dependence of the heating element's input power and temperature due to thermal inertia is captured using a long short-term memory network, forming a power-temperature curve. The second law of thermodynamics is embedded as a regularization term in the loss function, and a transfer learning strategy is used to accelerate the convergence of the power-temperature curve. The difference between the actual temperature and the ideal temperature of the heating element is analyzed, i.e., difference calculation is performed to obtain the heating element temperature evaluation result reflecting the heating element's temperature performance. The actual temperature of the heating element is monitored using a thermometer. If the heating element temperature evaluation result is within the preset range, the heating performance of the heating element is deemed qualified. The system prompts the designated personnel; if the assessed temperature of the heating element is less than the minimum value of the preset range (which includes both maximum and minimum values, with the minimum value represented by the minimum value of heating element temperature assessments over a historical time period), then heating operation is initiated. Heating operation is performed by using a chip built into the heating element, such as a DS18B20 or STTS22H, to control the heating. The chip connects to an NTC probe on the heating film, and the NTC probe and the temperature control circuit board work together for constant temperature control. For example, the resistance of the heating film changes non-linearly with temperature (following an exponential law). The resistance is converted into an analog voltage signal by a voltage divider circuit and then sent to the operational amplifier on the temperature control circuit board for conditioning and amplification. Finally, it is converted into a digital signal by an analog-to-digital converter (ADC) for processing by the microcontroller (MCU). The microcontroller unit internally runs a PID (Proportional-Integral-Derivative) algorithm, comparing the continuously collected actual temperature value of the heating element with the preset target temperature to calculate the three control parameters: proportional, integral, and derivative. It then adjusts the duty cycle of the output pulse width modulation signal to drive the chip built into the heating element. When the detected temperature is below the minimum value, the PWM duty cycle is increased to boost heating power; when the detected temperature is above the maximum value, the duty cycle is decreased to reduce electrical energy input, and an overshoot protection threshold is set to prevent drastic temperature fluctuations. If the heating element temperature assessment result is greater than the maximum value of the preset heating element temperature assessment result range (represented by the maximum value of heating element temperature assessment results over a historical period), a heating element cooling operation is performed. This cooling operation means controlling the heating element cooling through the chip built into the heating element. The heating element input power is input to a constructed power-power response model to obtain the ideal power consumption of the heating element.The specific construction process of the power-power response model is as follows: Key feature dimensions of the heating element's input power and power consumption are extracted using a regression algorithm. The time-series dependency of the heating element's input power and power consumption due to thermal inertia is captured using a long short-time memory network, forming a power-power curve. The second law of thermodynamics is embedded as a regularization term in the loss function, and a transfer learning strategy is used to accelerate the convergence process of the power-power curve. A power consumption evaluation result reflecting the heating element's power consumption performance is obtained by performing difference analysis between the actual power consumption and the ideal power consumption of the heating element. The actual power consumption of the heating element represents the total amount of electrical energy actually consumed, and is monitored by a smart meter. If the power consumption evaluation result is within the preset range (set in advance by preset personnel), a qualified energy consumption prompt is sent to the preset personnel; otherwise, an abnormal energy consumption prompt is sent to the preset personnel. The heating element's input power is input into the constructed power-heat response model to obtain the ideal heat of the heating element. The specific construction process of the power-heat response model is as follows: The heating element's input power is extracted using a regression algorithm. The key feature dimensions of the input power and heat of the heating element are captured by a long short-term memory network to capture the time-series dependence of the input power and heat of the heating element caused by thermal inertia, which together form a power-heat curve. After embedding the second law of thermodynamics as a regularization term in the loss function, a transfer learning strategy is used to accelerate the convergence process of the power-heat curve. The heat evaluation result of the heating element is obtained by performing difference analysis between the actual heat of the heating element and the ideal heat of the heating element. If the heat evaluation result is within the preset heat evaluation result range, which is set in advance by preset personnel, the heating element is qualified and a prompt is sent to the preset personnel. Otherwise, the heating element is abnormal and a prompt is sent to the preset personnel. The actual heat of the heating element is monitored by a calorimeter. For example, at a standard ambient temperature, such as 25°C, the time required for the heating film to reach the set temperature, such as 50°C, is recorded. The heating rate of a high-quality heating film should not be less than 2°C / min, and the heating process should be stable and without fluctuations. This can reflect its energy conversion efficiency and heating uniformity, thereby realizing the heating performance evaluation of the heating film liquid heating element. ;

[0053] In this embodiment, by performing a heating element performance evaluation, the actual working performance of the heating element can be effectively assessed, improving the accuracy of heating element performance judgment, providing a precise direction for subsequent precise temperature control and optimization, ensuring that the heating element achieves autonomous performance optimization under optimal working conditions, thereby comprehensively improving the reliability and thermal management accuracy of the heating element, and providing a solid theoretical basis and data support for subsequent heating element performance evaluation.

[0054] like Figure 4The diagram shown is a structural schematic of a heating performance evaluation device for an electrothermal film liquid heating element provided in an embodiment of this application. Figure 5 The diagram shown is a schematic representation of the heating element assembly structure of a heating element performance evaluation device for electrothermal film liquid provided in an embodiment of this application. Figure 6 The diagram shown is a schematic representation of the structure of an electrothermal film in an embodiment of this application for evaluating the heating performance of an electrothermal film liquid heating element. Based on this heating device, an application such as the method for evaluating the heating performance of an electrothermal film liquid heating element is used. The device includes: a cover 1, a plug assembly 2, a heating element assembly 3, a base 4, a circuit board 5, and a button 6. The cover 1 covers the heating element assembly 3, the base 4, and the circuit board 5, and is used to conduct the heat energy of the heating element assembly 3. The plug assembly 2 is used to connect a power source to provide electrical energy to the heating element assembly 3. The heating element assembly 3 includes: a plastic bracket 3-1, an electrothermal film 3-2, an NTC probe 3-3, and a power cord 3-4. 1. Point contact with the heating film 3-2 for fixing the heating film 3-2; the heating film 3-2 is inserted into the plastic bracket 3-1 in a ring shape for converting received electrical energy into heat energy; the NTC probe 3-3 is installed on the surface of the ring-shaped heating film 3-2 for real-time acquisition of the temperature of the heating film 3-2; the power cord 3-4 connects the heating film 3-2 and the plug socket assembly for transmitting electrical energy; the base 4 is used to fix the plug socket assembly 2, the heating element assembly 3, the circuit board 5, and the button 6 above; the circuit board 5 is used to receive the electrical signal of the heating film obtained by the NTC probe 3-3 for analysis and to control the heating and cooling of the heating film 3-2; the button 6 is used to control the opening and closing of the liquid heating element of the heating film.

[0055] Specifically, first, pressing the button allows the plug assembly to transmit current to both ends of the heating film via the power cord. Then, the heating film converts electrical energy into heat energy and transmits the real-time temperature readings to the NTC probe mounted on the surface of the circular heating film. The NTC probe's temperature-sensing element responds quickly to changes in the heating film's temperature. When the heating film's temperature rises, the NTC probe's resistance decreases; conversely, when the temperature falls, the resistance increases. This resistance change is converted into a standard analog electrical signal by the signal processing module inside the NTC probe and transmitted to the circuit board. The microprocessor inside the circuit board compares this signal with preset temperature thresholds, such as the set heating temperature and overheat protection temperature. If the actual temperature is lower than the set heating temperature, the microprocessor sends a command to the relay to close it, maintaining the heating film's energization and continuing heating. If the actual temperature reaches or exceeds the set heating temperature, the microprocessor controls the relay to open, cutting off the power to the heating film and stopping heating, thus achieving constant temperature control. Simultaneously, if the heating film malfunctions, such as a partial short circuit causing a sudden temperature rise exceeding the overheat protection temperature, the controller immediately cuts off the main power supply.

[0056] like Figure 7The figure shown is a graph of the input power and temperature of a heating element in an embodiment of this application for evaluating the heating performance of a heating element in an electrothermal film liquid. The graph reflects the relationship between the temperature of the heating element and the input power of the heating element. Initially, as the input power of the heating element increases, the temperature of the heating element continues to rise. When the input power reaches about 500W, the temperature reaches its peak. Afterward, as the input power continues to increase, the temperature begins to decrease, showing a trend of first rising and then falling.

[0057] like Figure 8 The figure shows the heating element input power-heating element power consumption curve of a heating element for evaluating the heating performance of an electrothermal film liquid provided in an embodiment of this application. The figure shows the relationship between the heating element power consumption and the heating element input power. As the heating element input power increases, the heating element power consumption generally shows an upward trend, but the rate of increase gradually slows down and eventually stabilizes. This indicates that when the input power reaches a certain level, the power consumption no longer increases significantly.

[0058] like Figure 9 The figure shown is a graph of the input power and heat output of a heating element in an embodiment of this application, which illustrates the relationship between the heat output and the input power of the heating element. As the input power increases, the heat output rises continuously. In the later stages of the power increase, the rate of increase in heat output slows down, showing an overall trend of continuous growth that eventually levels off.

[0059] In summary, this application embodiment obtains the evaluation results of the electrothermal film voltage switching by performing an evaluation, and determines whether to optimize the electrothermal film voltage switching based on the obtained evaluation results. This helps to accurately evaluate the electrothermal film voltage switching situation, improve the stability of the electrothermal film voltage switching, reduce inaccurate electrothermal film electrical signal acquisition caused by switching noise, and ensure the accuracy of the electrothermal film voltage switching frequency to improve the stability of the heating element's operation. Furthermore, by performing an electrothermal film load characteristic measurement to obtain the measurement results, and determining whether to perform load characteristic stabilization operations based on the obtained measurement results, this helps to accurately evaluate the electrothermal film load characteristics and improve... The qualification of the electric heating film is ensured to avoid incomplete electric signal acquisition due to rapid changes in the load characteristics of the electric heating film, thus ensuring the reliability of the electric signal and improving the accuracy of the heating element's operation. This is achieved by performing electric heating film signal acquisition and monitoring to obtain the monitoring results. Based on the acquired results, it is determined whether the electric heating film signal acquisition and monitoring meets the qualification conditions. This helps to accurately assess the qualification level of the electric heating film signal acquisition and monitoring, improve the accuracy of electric heating film signal acquisition, reduce incomplete electric signal acquisition caused by rapid changes in the frequency of electric signal changes, ensure the qualification of electric heating film signal acquisition, and thereby improve the accuracy of the heating performance evaluation of the electric heating film liquid heating element.

[0060] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for evaluating the heating performance of a heating element for electrothermal film liquid, characterized in that, Includes the following steps: During the evaluation of the heating performance of the heating element, an electrothermal film voltage switching evaluation is performed to obtain an evaluation result reflecting the qualification of the electrothermal film voltage switching. Based on the obtained evaluation result, it is determined whether to optimize the electrothermal film voltage switching. The optimization of the electrothermal film voltage switching includes: a switching voltage phase alignment operation to improve the qualification of the electrothermal film switching voltage phase alignment and an electrothermal film noise adjustment to reduce the noise interference of the electrothermal film switching voltage. The electrothermal film refers to the functional element in the heating element that generates heat. After an abnormality occurs during the voltage switching optimization of the electric heating film, an electric heating film load characteristic measurement is performed to obtain the electric heating film load characteristic measurement result, which reflects the qualification level of the electric heating film load characteristic. Based on the obtained electric heating film load characteristic measurement result, it is determined whether to perform load characteristic stabilization operation. The load characteristic stabilization operation is used to ensure the stability of the electric heating film load and improve the monitoring accuracy of the electric heating film load. After the load characteristics of the electric heating film are qualified, the electric heating film signal acquisition and monitoring is performed to obtain the electric heating film signal acquisition and monitoring results to reflect the qualification level of the electric heating film signal acquisition and monitoring and to determine whether it meets the qualification conditions of the electric heating film signal acquisition and monitoring. If it meets the conditions, the heating performance evaluation of the heating element is performed to evaluate the heating performance of the heating element. Otherwise, the electric heating film signal acquisition optimization is performed to improve the stability of the electric heating film signal acquisition.

2. The method for evaluating the heating performance of a heating element for electrothermal film liquid according to claim 1, characterized in that, The specific process for determining whether to optimize the electrothermal film voltage switching based on the obtained evaluation results is as follows: The evaluation results of the electric heating film voltage switching are obtained by quantifying the ratio of the electric heating film voltage stability and the preset electric heating film voltage stability. Determine whether the electric heating film voltage switching qualification conditions are met based on the obtained evaluation results of the electric heating film voltage switching. The stability of the electric heating film voltage is represented by the ratio of the switching frequency of the preset electric heating film voltage during the preset electric heating film voltage switching evaluation period to the switching frequency of the electric heating film voltage, which is used to reflect the passability of the electric heating film voltage switching frequency. The qualified condition for the electric heating film voltage switching means that the electric heating film voltage switching evaluation result is greater than the preset electric heating film voltage switching evaluation result; If the evaluation results of the electric heating film voltage switching meet the qualified conditions for electric heating film voltage switching, then the electric heating film signal acquisition and monitoring will be performed; otherwise, the electric heating film voltage switching optimization will be performed.

3. The method for evaluating the heating performance of a heating element for electrothermal film liquid according to claim 2, characterized in that, The specific process for optimizing the voltage switching of the electrothermal film is as follows: The phase of the electrical signal corresponding to the converted electrothermal film voltage is controlled within a preset phase range, and the electrothermal film noise is adjusted by an averaging filter. The noise adjustment of the electrothermal film means that the average length of the window movement is increased step by step with the amplitude corresponding to the preset average length of the window movement as the adjustment step. The preset window moving average length ratio is obtained by inputting the electrothermal film voltage switching evaluation result and the average voltage value into the moving length average mapping set; The average voltage value is represented by the average value of the voltage across the two ends of the electric heating film during a preset electric heating film voltage switching evaluation period. If the re-acquired electrothermal film voltage switching evaluation result after optimization meets the qualified conditions for electrothermal film voltage switching, then electrothermal film signal acquisition and monitoring will be performed; otherwise, electrothermal film load characteristic measurement will be performed.

4. The method for evaluating the heating performance of a heating element for an electrothermal film liquid according to claim 3, characterized in that, The specific process for measuring the load characteristics of the electrothermal film is as follows: The load characteristics of the electrothermal film are measured by harmonic averaging the results of the resistance change of the electrothermal film and the frequency change of the electrical signal. Determine whether the electric heating film load characteristic measurement results meet the qualification conditions for electric heating film load characteristic measurement based on the obtained results. If the results of the load characteristic measurement of the electric heating film meet the qualified conditions for the load characteristic measurement of the electric heating film, then the electric heating film signal acquisition and monitoring will be performed; otherwise, the load characteristic stabilization operation will be performed. The qualified condition for measuring the load characteristics of the electrothermal film indicates that the result of the electrothermal film load characteristics measurement is greater than the preset result of the electrothermal film load characteristics measurement. The result of the change in resistance of the heating film is quantified by the ratio of the preset change rate of resistance of the heating film to the change rate of resistance of the heating film, and then weighted by the resistance control rate, which is used to reflect the degree of influence of the change in resistance of the heating film on the measurement result of the load characteristics of the heating film. This result is used to reflect the pass rate of the change in resistance of the heating film. The electrical signal frequency change result is quantified by the ratio of the preset electrical signal frequency change of the electrothermal film to the electrical signal frequency change of the electrothermal film. It is then combined with the signal change regulation rate, which reflects the degree of influence of the electrical signal frequency change result on the measurement result of the electrothermal film load characteristics, to reflect the pass rate of the electrical signal frequency change of the electrothermal film.

5. The method for evaluating the heating performance of a heating element for electrothermal film liquid according to claim 4, characterized in that, The specific process for performing load characteristic stabilization is as follows: The electrical signal acquisition frequency resolution is adjusted by gradually increasing the electrical signal acquisition frequency resolution step by step, with the amplitude corresponding to the preset acquisition frequency resolution ratio as the adjustment step size. The preset acquisition frequency resolution ratio is obtained by inputting the electrothermal film load characteristic measurement result and the original electrical signal acquisition frequency resolution into the electrical signal acquisition mapping set. The aforementioned adjustment of the electrical signal acquisition frequency resolution is used to increase the electrical signal acquisition frequency in order to improve the monitoring accuracy of the electrothermal film load characteristics. If the load characteristic measurement result of the electrothermal film obtained again after the load characteristic stabilization operation meets the qualified conditions for the load characteristic measurement of the electrothermal film, then the electrothermal film signal acquisition and monitoring will be performed; otherwise, an abnormal load characteristic stabilization operation prompt will be sent to the preset personnel.

6. The method for evaluating the heating performance of a heating element for an electrothermal film liquid according to claim 5, characterized in that, The specific process for performing electrothermal film signal acquisition and monitoring is as follows: Determine whether the acquisition and monitoring results of the electrothermal film signal meet the qualification conditions for electrothermal film signal acquisition and monitoring. The qualified condition for electrothermal film signal acquisition and monitoring indicates that the electrothermal film signal acquisition and monitoring result is greater than the preset electrothermal film signal acquisition and monitoring result; If the signal acquisition and monitoring results of the electric heating film meet the qualified conditions for electric heating film signal acquisition and monitoring, the heating performance of the heating element will be evaluated; otherwise, the signal acquisition of the electric heating film will be optimized.

7. The method for evaluating the heating performance of a heating element for an electrothermal film liquid according to claim 6, characterized in that, The specific process for acquiring the signal acquisition and monitoring results of the electrothermal film is as follows: The electrical signal timing offset index is obtained by quantifying the ratio of the preset electrical signal timing offset to the electrical signal timing offset, which reflects the degree of acceptance of the electrical signal timing offset. The electrical signal timing offset result, which reflects the phase qualification of the electrothermal film, is obtained by weighting the electrical signal timing offset index in combination with the timing offset rate. The timing offset rate is used to reflect the degree to which the timing offset result of the electrical signal affects the acquisition and monitoring result of the electrothermal film signal; The electrothermal film signal acquisition and monitoring results are obtained by harmonic averaging the electrical signal timing offset results and the electrothermal film load characteristic measurement index. The electrical signal timing offset is represented by the average of the differences between the time of each sampling trigger point and the time of the preset sampling point during the preset electrothermal film signal acquisition and monitoring period. The electrothermal film load characteristic measurement index is represented by a weighted result of the qualified electrothermal film load characteristic measurement result combined with the load characteristic regulation rate, which is used to reflect the degree of influence of the electrothermal film load characteristic measurement index on the electrothermal film signal acquisition and monitoring result, and is used to reflect the change of electrothermal film load characteristics. The qualified electrothermal film load characteristic measurement result is represented by the electrothermal film load characteristic measurement result corresponding to the qualified conditions for electrothermal film load characteristic measurement.

8. The method for evaluating the heating performance of a heating element for an electrothermal film liquid according to claim 6, characterized in that, The specific process for optimizing the electrothermal film signal acquisition is as follows: Noise denoising processing is performed on the electrothermal film signal to remove noise from the electrothermal film signal during the acquisition process. The aforementioned electrothermal film signal denoising processing is used to reduce interference in the acquisition of the electrothermal film's electrical signals, thereby improving the accuracy of the electrical signal acquisition. Electrical signal acquisition and processing are performed, and the reference frequency is adjusted based on the difference between the reference frequency and the electrical signal acquisition frequency of the electrothermal film. The aforementioned adjustment of the reference frequency means gradually increasing the reference frequency of the heating film by using the amplitude corresponding to the preset reference frequency ratio as the adjustment step size. The preset reference frequency ratio is obtained by inputting the electrothermal film signal acquisition and monitoring results and the electrical signal sampling pulse into the reference frequency mapping set; The electrical signal acquisition and processing is used to reduce the trigger point time error and decrease the electrical signal timing offset. If the re-acquired electrothermal film signal acquisition and monitoring results after optimization meet the qualified conditions for electrothermal film signal acquisition and monitoring, the heating performance of the heating element will be evaluated; otherwise, an abnormality prompt for electrothermal film signal acquisition and optimization will be sent to the designated personnel.

9. The method for evaluating the heating performance of a heating element for electrothermal film liquid according to claim 8, characterized in that, The specific process for performing the heating performance evaluation of the heating element is as follows: The input power of the heating element is fed into the constructed power-temperature response model to obtain the ideal temperature of the heating element; By analyzing the difference between the actual temperature and the ideal temperature of the heating element, a temperature evaluation result reflecting the temperature performance of the heating element is obtained. If the temperature assessment result of the heating element is within the preset range of the heating element temperature assessment result, a notification that the heating element's heating performance is qualified will be sent to the preset personnel. If the temperature assessment result of the heating element is less than the minimum value of the preset temperature assessment result range of the heating element, then the heating element heating operation will be performed. The heating operation of the heating element refers to controlling the heating element's heating through a chip built into the heating element; The chip is connected to an NTC probe on the electrothermal film, and the NTC probe and the temperature control circuit board work together to perform constant temperature control. If the temperature assessment result of the heating element is greater than the maximum value of the preset temperature assessment result range of the heating element, the heating element cooling operation will be performed. The cooling operation of the heating element refers to controlling the cooling of the heating element through the chip built into the heating element. The input power of the heating element is fed into the constructed power-power response model to obtain the ideal power consumption of the heating element; By performing difference analysis between the actual power consumption and the ideal power consumption of the heating element, a power consumption evaluation result reflecting the power consumption performance of the heating element is obtained. If the power consumption assessment result of the heating element is within the preset range of the power consumption assessment result of the heating element, the power consumption of the heating element is qualified and a preset personnel will be notified; otherwise, the power consumption of the heating element is abnormal and a preset personnel will be notified. The input power of the heating element is fed into the constructed power-thermal response model to obtain the ideal heat of the heating element; By analyzing the difference between the actual heat output and the ideal heat output of the heating element, a heat output evaluation result reflecting the heat output performance of the heating element is obtained. If the heat assessment result of the heating element is within the preset range, the heating element is deemed to be of acceptable quality and the preset personnel will be notified; otherwise, the heating element is deemed to be of abnormal quality and the preset personnel will be notified.

10. A heating device for electrothermal film liquid, employing the heating performance evaluation method for a heating element for electrothermal film liquid as described in any one of claims 1-9, characterized in that, include: Face cover (1), plug socket assembly (2), heating element assembly (3), base (4), circuit board (5) and button (6); The cover (1) covers the heating element assembly (3), the base (4), and the circuit board (5) to conduct the heat energy of the heating element assembly (3); The plug and socket assembly (2) is used to connect the power supply to provide electrical energy to the heating element assembly (3); The heating element assembly (3) includes: a plastic bracket (3-1), an electrothermal film (3-2), an NTC probe (3-3), and a power cord (3-4). The plastic bracket (3-1) makes point contact with the heating film (3-2) to fix the heating film (3-2). The electrothermal film (3-2) is inserted into the plastic support (3-1) in a ring shape to convert the received electrical energy into heat energy; The NTC probe (3-3) is mounted on the surface of the circular electrothermal film (3-2) for real-time acquisition of the temperature of the electrothermal film (3-2); The power cord (3-4) connects the heating film (3-2) and the plug assembly for transmitting electrical energy; The base (4) is used to fix the plug socket assembly (2), heating element assembly (3), circuit board (5) and button (6) above. The circuit board (5) is used to receive the electric signal of the electrothermal film obtained by the NTC probe (3-3), analyze it, and control the heating and cooling of the electrothermal film (3-2); The button (6) is used to control the opening and closing of the heating element for the electrothermal film liquid.

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