Energy-saving control method and system for automobile baking paint lamp

Abstract

The application relates to the technical field of energy-saving control, and particularly discloses an energy-saving control method and system for an automobile baking paint lamp. The method comprises the following steps: applying a heating test to a controlled paint surface, extracting a transient heat diffusion feature to determine whether there is an implicit heat extraction effect; if there is, obtaining a critical input threshold and discretizing a continuous heating instruction into an intermittent pulse sequence; evaluating an extraction effect decay process in a pulse-off section and obtaining deep heat storage saturation; analyzing an energy coverage relationship of residual cross-linking heat demand of a paint film, triggering an early fusing instruction, and driving the paint surface into a passive heat gliding curing stage. The system comprises an extraction identification module, a critical analysis module, a retardation analysis module, a decay evaluation module and an instruction triggering module. The application converts invalid heat leakage absorbed by the substrate into a feedback heat source in the later period through pulse retardation heat leakage, which is beneficial to reducing long tail energy consumption in the curing tail period.

Description

Technical Field

[0001] This invention relates to the field of energy-saving control technology, specifically to an energy-saving control method and system for automotive paint lamps. Background Technology

[0002] In automotive paint repair, infrared baking lamps are the core equipment for achieving rapid paint film curing. However, the car body is not a uniform thin sheet metal structure; it contains many heterogeneous thickened structures such as anti-collision beams, reinforcing ribs, and double-layer plates.

[0003] During the actual baking process, the thick underlying structure generates a strong "hidden heat extraction effect." This continuously conducts and absorbs the heat energy radiating onto the surface paint film into the deeper layers of the substrate. Because traditional control systems cannot penetrate the paint film to perceive the physical thickness differences of the underlying layer, when they detect a slow rise in surface temperature or a drop due to heat leakage, the system mechanically interprets this as "insufficient heat input" and blindly drives the baking lamps to continuously output high-power infrared radiation in order to forcibly maintain the surface temperature.

[0004] Forcibly maintaining the surface temperature results in electrical energy not being used to induce the cross-linking phase transition of the surface coating polymer, but instead being ineffectively dissipated into heating the underlying substrate unnecessarily, leading to energy waste. In addition, excessive heat accumulation in the underlying layer slows down the cooling process, which can easily cause destructive heat backflow during the final stages of curing, affecting film quality.

[0005] Therefore, the present invention provides an energy-saving control method and system for automotive paint lamps. Summary of the Invention

[0006] The purpose of this invention is to provide an energy-saving control method and system for automotive paint lamps to solve the aforementioned background problems.

[0007] The objective of this invention can be achieved through the following technical solutions: An energy-saving control method for automotive paint lamps includes the following steps: A probing heating test is applied to the controlled paint surface, and the transient thermal diffusion characteristics of the downward heat conduction rate are extracted simultaneously. The attenuation steepness of the transient thermal diffusion characteristics is extracted to determine whether there is a hidden thermal extraction effect caused by the underlying heterogeneous material in the current baking area. If a hidden heat extraction effect exists, obtain the inherent thermal properties of the controlled paint surface and perform thermodynamic equivalent conversion to obtain the interfacial heat flux; based on the interfacial heat flux, analyze the maximum energy accumulation boundary for maintaining the local thermal equilibrium of the paint surface to obtain the critical input threshold. The preset continuous heating command is discretized according to the critical input threshold to generate an intermittent pulse sequence; the paint baking lamp is driven to alternately execute the radiation on and forced off strategy based on the intermittent pulse sequence to obtain a heat flow blocking layer that counteracts the hidden heat extraction effect. Within the forced shutdown segment of the intermittent pulse sequence, the instantaneous cooling slope of the controlled paint surface is extracted and compared with the interfacial heat leakage flux to obtain the heat leakage attenuation characteristic quantity and evaluate the dynamic decay process of the implicit heat extraction effect, thereby obtaining the deep heat storage saturation.

[0008] Furthermore, the method for extracting the transient thermal diffusion characteristics is as follows: Based on the applied probing heating test, a measurement blind zone delay of a preset duration is initiated; After the measurement blind zone delay ends, discrete temperature data points of the controlled paint surface are collected under the condition of no external heat source input. The discrete temperature data points are serialized and stitched together according to the time axis to construct a cooling time series; From the transient cooling time series, the transient thermal diffusion characteristics of the temperature dropping exponentially over time are extracted using a logarithmic linearization algorithm.

[0009] Furthermore, the method for analyzing the maximum energy accumulation boundary is as follows: Obtain the calibrated output power of the paint lamp tube under the current supply voltage, and calculate the effective radiation injection power by combining the absorption rate of infrared radiation on the paint surface. By combining the effective radiative injection power and the interface heat leakage flux, a correlation analysis of radiative flux and conduction duration is performed to obtain the maximum energy accumulation boundary.

[0010] Furthermore, the method for performing the aforementioned correlation calculus analysis is as follows: The effective radiative heat injection flux is used as the heat input term, and the interfacial heat leakage flux is used as the heat loss term. The heat input term is subtracted from the heat loss term to calculate the net heat absorption rate of the controlled paint surface under heating conditions. Among them, the effective radiative injection heat flux is the ratio of the effective radiative injection power to the actual heated area of ​​the controlled paint surface; Extract the heat capacity parameter per unit area from the inherent thermophysical parameters, obtain the maximum allowable temperature rise limit value of the preset paint surface, and multiply the temperature rise limit value by the heat capacity parameter per unit area to obtain the maximum energy storage boundary.

[0011] Furthermore, the process of obtaining the heat flow blocking layer is as follows: The intermittent pulse sequence is sent to the power execution terminal of the paint baking lamp, causing the infrared generator to perform periodic energy injection and physical power-off, and forming a positive thermal gradient; The positive thermal gradient from the surface of the paint film to the depth of the substrate is continuously compressed until the positive thermal gradient approaches zero at the end of the cutoff phase. By periodically establishing and forcibly zeroing the forward thermal gradient, a virtual boundary layer that blocks the downward penetration of internal energy in the time dimension is established above the physical interface between the paint film and the substrate, thus obtaining the heat flow blocking layer.

[0012] Furthermore, the intermittent pulse sequence is established as follows: Based on the critical input threshold, a dynamic control strategy based on energy integral limiting is constructed; The pre-stored equivalent heat transfer coefficient of the controlled paint surface and the current environmental convective heat transfer coefficient are used to perform a self-dissipation analysis of the driven temperature difference to obtain the natural dissipation time. The natural dissipation time is used as the benchmark duration for the forced shutdown phase that limits heat penetration into the lower layers. By alternating the radiation-on segment and the forced-off segment, which are subject to absolute energy limitations, on the time axis, a time-discrete intermittent pulse sequence is generated.

[0013] Furthermore, the deep heat storage saturation and the transient internal energy of the paint surface are accumulated and analyzed to obtain the effective thermal potential energy; the relationship between the effective thermal potential energy and the remaining energy coverage of the paint film is evaluated, and the early melting command is determined based on the energy coverage relationship. If it is triggered, the controlled paint surface is driven into the passive thermal sliding curing stage.

[0014] Furthermore, the energy coverage relationship is established as follows: Obtain the heat gap value, perform an algebraic subtraction operation between the effective thermal potential energy and the heat gap value, and calculate the difference in physical quantities. Based on the positive or negative attribute of the difference in physical quantities, it is determined whether the currently accumulated effective thermal potential energy is sufficient to cover the heat required for the remaining cross-linking reaction, and the determination result is used as the energy coverage relationship.

[0015] Furthermore, the process of obtaining the heat deficit value is as follows: Obtain the current system's ambient reference temperature and extract the system's preset minimum critical activity temperature to maintain the uninterrupted polymer crosslinking reaction; Calculate the physical heat transfer temperature difference between the minimum critical activity temperature and the ambient reference temperature; Obtain the comprehensive heat dissipation coefficient per unit area of ​​the current environment, and multiply the comprehensive heat dissipation coefficient with the physical heat transfer temperature difference to obtain the heat dissipation flux per unit area. Obtain the remaining crosslinking time, multiply the heat dissipation flux by the remaining crosslinking time, and obtain the heat gap value per unit area.

[0016] An energy-saving control system for automotive paint lamps includes the following modules: Extraction identification module: used to apply exploratory heating test to the controlled paint surface and simultaneously extract transient heat diffusion features; extract the attenuation steepness of transient heat diffusion features to determine whether there is a hidden heat extraction effect in the current baking area; Critical Analysis Module: If a hidden heat extraction effect exists, the inherent thermophysical parameters are obtained and thermodynamic equivalent conversion is performed to obtain the interfacial heat leakage flux; based on the interfacial heat leakage flux, the maximum energy accumulation boundary is established to obtain the critical input threshold. The hindrance analysis module is used to discretize the preset continuous heating command according to the critical input threshold and generate an intermittent pulse sequence; based on the intermittent pulse sequence, the paint lamp is driven to alternately execute the radiation on and forced off strategies to obtain the heat flow hindrance layer. The decay assessment module is used to extract the instantaneous cooling slope of the controlled paint surface during the forced shutdown segment of the intermittent pulse sequence and compare it with the interface heat leakage flux to obtain the heat leakage decay characteristics and evaluate the dynamic decay process, thereby obtaining the deep heat storage saturation. Command triggering module: used to accumulate and analyze the deep heat storage saturation and the transient internal energy of the paint surface to obtain the effective thermal potential energy; evaluate the energy coverage relationship, and determine whether to trigger the early melting command based on the energy coverage relationship. If triggered, the controlled paint surface is driven into the passive thermal sliding curing stage.

[0017] The beneficial effects of this invention are as follows: 1. By applying a probing heating test to the controlled paint surface and cutting off the power supply circuit to initiate a measurement blind zone delay; by constructing a cooling time series using discrete temperature data points, and extracting the transient thermal diffusion characteristics and attenuation steepness of the exponential temperature drop, the abstract thermal response process of the substrate heat absorption is transformed into a quantitative indicator; based on the logical comparison of the attenuation steepness and the judgment threshold, the underlying thickened heterogeneous structure that absorbs heat is identified in the early stage of baking, changing the conventional logic of the system blindly maintaining the paint surface temperature and continuously outputting full power. After determining the existence of a hidden heat extraction effect, the first-order difference slope of the transient cooling time series is extracted and combined with the unit area heat capacity parameter of the controlled paint surface to convert the rate of change in the temperature dimension into the interface heat leakage flux in the energy dimension, quantifying the equivalent heat absorption of the substrate; by establishing pulse duration analysis logic with effective radiative injection power and interface heat leakage flux, the maximum energy accumulation boundary that the controlled paint film itself can accommodate is derived, and a physical interception upper limit is established to limit the forced heat conduction into the depth of the substrate.

[0018] 2. A dynamic control strategy based on energy integral limiting is adopted to forcibly cut off continuous heating commands; the time span required for the surface temperature of the paint film to approach the temperature of the substrate interface is analyzed and used as the reference duration of the forced shutdown segment; by alternating the radiation on segment and the forced shutdown segment in the time domain, the infrared generator is driven to periodically inject energy and physically disconnect, thereby constructing a virtual heat flow blocking layer in the time domain above the interface between the paint film and the substrate, causing the lost heat flow wavefront to naturally stop due to the loss of temperature and pressure difference.

[0019] 3. During the forced shutdown segment of the intermittent pulse sequence, the extracted instantaneous cooling slope is converted into real-time interface heat leakage flux and calculated complementaryly with the interface heat leakage flux under the initial cold state. The output is a characteristic quantity representing the heat leakage attenuation as the heat transfer temperature difference decreases. The deep heat storage saturation, representing the degree of temperature rise accumulation in the bottom layer, is extracted. A numerical climbing curve is constructed based on the saturation, and the instantaneous tangent slope is analyzed to evaluate the dynamic decay process of the implicit heat extraction effect from strong to weak. By determining the energy coverage relationship between the accumulated internal energy and the remaining chemical crosslinking reaction, when it is determined that the internal static energy reserve meets the dynamic crosslinking requirements, the main control unit intercepts the subsequent heating schedule and issues an early melting command. By utilizing the reverse heat backflow from the bottom material to the surface coating film and the delayed release due to the thermal inertia of the coating film itself, the heat consumption of the substrate in the early stage is converted into a feedback heat source in the later stage, which is beneficial to reducing the long-tail energy consumption in the final stage of curing. Attached Figure Description

[0020] The invention will now be further described with reference to the accompanying drawings.

[0021] Figure 1 This is a flowchart of an energy-saving control method for automotive paint lamps according to the present invention; Figure 2 This is a flowchart in the present invention for determining whether there is a hidden thermal stripping effect in the current baking area; Figure 3 This is a functional block diagram of an energy-saving control system for automotive paint lamps according to the present invention. Detailed Implementation

[0022] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0023] Example 1: Please see Figure 1 As shown, an energy-saving control method for automotive paint lamps includes the following steps: S10. Apply a probing heating test to the controlled paint surface and simultaneously extract the transient thermal diffusion characteristics of the downward heat conduction rate; extract the attenuation steepness of the transient thermal diffusion characteristics to determine whether there is a hidden thermal extraction effect caused by the underlying heterogeneous material in the current baking area. The method of applying a probing heating pulse to the controlled paint surface and simultaneously extracting the transient thermal diffusion characteristics of the downward heat conduction rate is as follows: In some embodiments, during the initial preheating phase of the paint baking equipment, a control command is sent to the power controller of the paint baking lamp to output continuous short-duration full-power infrared radiation to the controlled paint surface to be baked, in order to create heat accumulation on the controlled paint surface as a probe heating test of the controlled paint surface. Based on the applied probing heating test, the power supply circuit of the paint lamp is cut off, and a measurement blind zone delay of a preset duration is initiated; It should be noted that by setting a measurement blind zone delay, it is beneficial to reduce the physical interference caused by the residual heat radiation of the internal tungsten filament of the painted lamp tube to the temperature measuring element after the power is turned off, thereby improving the purity of the collected data. After the measurement blind zone delay ends, the infrared temperature sensor arranged on the paint baking equipment is used to collect discrete temperature data points of the controlled paint surface in real time at high frequency under the condition of no external heat source input. The discrete temperature data points are serialized and spliced ​​along the time axis to construct a cooling time series that reflects the natural heat dissipation process of the controlled paint surface. From the transient cooling time series, the transient thermal diffusion characteristics in which the temperature drops exponentially over time are extracted using a log-linearization algorithm; Preferably, the method for extracting transient thermal diffusion characteristics where the temperature drops exponentially over time is as follows: A logarithmic linearization algorithm is used to mathematically transform the transient cooling time series, mapping the nonlinear cooling curve into linear data; Calculate the absolute value of the regression slope of the transformed linear data, and use the absolute value of the regression slope as the characteristic rate constant reflecting the rate of heat dissipation from the paint surface, as the transient thermal diffusion characteristic of the current sampling period; The method for determining whether there is a hidden thermal stripping effect caused by the underlying heterogeneous material in the current baking area by extracting the attenuation steepness of transient thermal diffusion characteristics is as follows: Obtain the transient thermal diffusion characteristics of a standard thin sheet metal part under a pre-calibrated reference at the same ambient temperature, and use it as the reference diffusion constant; Calculate the ratio of the difference between the transient thermal diffusion characteristics of the current sampling period and the reference diffusion constant to obtain the attenuation steepness of the transient thermal diffusion characteristics; Construct a comparison logic for the hidden thermal detachment effect, input the attenuation steepness into the comparison logic, and obtain the determination result of whether the hidden thermal detachment effect exists. Preferably, the method for constructing the comparison logic for the implicit thermal detachment effect is as follows: like Figure 2 As shown, if the attenuation steepness of the current sampling period is greater than or equal to the preset attenuation steepness threshold, it indicates that the cooling rate of the controlled paint surface is steep, and the heat is not left on the paint film surface but is quickly drawn downwards. It is determined that there is a bottom heterogeneous material of anti-collision beam or heavy metal inside the substrate of the current baking area, that is, there is a hidden extraction effect. If the calculated attenuation steepness is less than the judgment threshold, it indicates that the natural heat dissipation of the controlled paint surface is within the physical range of normal thin parts, and it is determined that there is no hidden heat extraction effect in the current baking area. Understandably, the purpose of determining whether a hidden thermal detachment effect exists is to: Function 1: Identifying high-energy-consuming blind spots: Through physical thermal response testing, the thickened bottom layer structure that consumes heat is identified in the early stages of baking, preventing the subsequent control system from continuously outputting full power in order to blindly maintain the paint surface temperature, thus cutting off ineffective energy waste at the source. Second, it serves as a trigger anchor point for subsequent time-domain control: the determination result of the implicit thermal extraction effect reflects the thermal boundary conditions of the substrate, providing a verified objective trigger condition for the subsequent system to switch from a continuous constant heating strategy to a high-frequency pulse intermittent heating strategy.

[0024] S20. If a hidden heat extraction effect exists, obtain the inherent thermal properties of the controlled paint surface and perform thermodynamic equivalent conversion to obtain the interfacial heat flux; based on the interfacial heat flux, analyze the maximum energy accumulation boundary for maintaining the local thermal balance of the paint surface to obtain the critical input threshold. If a latent heat extraction effect exists, the method for obtaining the inherent thermophysical parameters of the controlled paint surface and performing thermodynamic equivalent conversion to obtain the interfacial heat flux is as follows: In some embodiments, the transient cooling time series constructed in S10 is extracted, and the first-order difference slope of the discrete temperature data points in the time dimension is calculated to obtain the instantaneous cooling rate of the controlled paint surface in the absence of a heat source. The system obtains the basic specific heat capacity parameters, material density and estimated film thickness of the controlled paint surface stored in the system. Based on the thermodynamic volumetric heat capacity principle, the heat capacity parameter per unit area of ​​the controlled paint surface is calculated. The energy loss rate per unit area is obtained by multiplying the instantaneous cooling rate by the heat capacity per unit area. Understandably, the energy loss rate is used to convert the rate of change in the temperature dimension into the dissipation flux in the energy dimension. Energy loss rate is used as the interfacial heat flux of the controlled paint to conduct heat to the underlying heterogeneous material; Among them, the critical input threshold is obtained by determining the maximum energy accumulation boundary for maintaining local thermal equilibrium of the paint surface based on interface heat flux analysis: Obtain the calibrated output power of the paint lamp tube under the current supply voltage, and calculate the effective radiation injection power by combining the absorption rate of infrared radiation on the paint surface. By combining the effective radiative injection power and the interfacial heat leakage flux, the correlation between radiative flux and conduction time is calculated and analyzed to obtain the maximum energy accumulation boundary that the coating film can accommodate without inducing forced heat conduction into the depth of the substrate. The preferred method for performing correlation analysis between radiation flux and conduction duration is as follows: The effective radiative heat injection flux is used as the heat input term, and the interfacial heat leakage flux is used as the heat loss term. The net heat absorption rate of the controlled paint surface under the heating state is calculated by subtracting the heat input term from the heat loss term. Among them, the effective radiative heat injection flux is the ratio of the effective radiative injection power to the actual heated area of ​​the controlled paint surface. Obtain the maximum allowable temperature rise limit value of the preset paint surface, multiply the temperature rise limit value by the heat capacity parameter per unit area, and calculate the maximum energy accumulation boundary that the paint film can accommodate without causing forced heat conduction into the depth of the substrate. Divide the maximum energy storage boundary by the net heat absorptivity to calculate the longest conduction time that infrared radiation can sustain in a single pulse. By integrating the effective radiative injection power over the longest conduction time, the absolute physical boundary that limits heat penetration into deeper layers is obtained, which serves as the critical input threshold for a single infrared pulse.

[0025] Example 2: Please see Figure 1 As shown, an energy-saving control method for automotive paint lamps includes the following steps: S30. Discretize the preset continuous heating command according to the critical input threshold to generate an intermittent pulse sequence; drive the paint lamp to alternately execute the radiation on and forced off strategies based on the intermittent pulse sequence to obtain a heat flow blocking layer that counteracts the hidden heat extraction effect. The method for discretizing the preset continuous heating command according to the critical input threshold to generate the intermittent pulse sequence is as follows: In some embodiments, the continuous heating power curve sent by the main control system of the paint baking equipment is intercepted; Based on the critical input threshold defined by S20, a dynamic control strategy based on energy integral limiting is constructed to forcibly truncate the continuous heating power curve. Preferably, the method for constructing a dynamic control strategy based on energy integral limiting is as follows: Read the minimum control cycle of the system, and use the minimum control cycle as the time-domain step to perform discrete accumulation and integration on the commanded expected power on the continuous heating power curve; When the cumulative integral value reaches the critical input threshold, a falling edge signal that triggers shutdown is generated, and the integral accumulation stage is defined as the radiation-on segment of a single pulse, which is used to limit the absolute energy injected into the controlled paint surface in a single pulse to within a safe threshold. By obtaining the pre-stored equivalent heat transfer coefficient of the controlled paint surface and the current environmental convective heat transfer coefficient, a self-dissipation analysis of the driven temperature difference is performed to obtain the natural dissipation time required for the peak temperature of the paint film surface to fall back to equilibrium with the temperature at the interface with the substrate at the end of the radiation opening segment. Preferably, the method for performing the self-dissipation analysis of the driving temperature difference is as follows: Obtain the peak temperature of the paint film surface at the end of the radiation-activated section, and calculate the first temperature difference between it and the ambient temperature, and the second temperature difference between it and the interface temperature with the substrate. The surface convective heat transfer coefficient is multiplied by the first temperature difference to calculate the surface convective heat flux lost to the environment. The positive heat transfer flux into the substrate is calculated by multiplying the equivalent heat transfer coefficient of the controlled paint surface with the second temperature difference. The total transient heat dissipation flux of the coating film at the current moment is obtained by algebraically adding the surface convective heat flux and the forward conductive heat flux. The heat capacity per unit area of ​​the controlled paint surface calculated in S20 is called, and the second temperature difference is multiplied with the heat capacity per unit area to calculate the target heat loss that must be dissipated when the surface temperature of the paint film drops back to the temperature of the substrate interface. Divide the target heat dissipation by the total transient heat flux, and calculate the theoretical time span of the cooling process using the quotient. Output the theoretical time span as natural dissipation time; The natural dissipation time is used as the benchmark duration for the forced shutdown phase that limits heat penetration into the lower layers. By alternating the radiation-on segment and the forced-off segment, which are subject to absolute energy limitations, on the time axis, a time-discrete intermittent pulse sequence is generated. Among them, the method of using an intermittent pulse sequence to drive the paint baking lamp to alternately execute radiation on and forced off to obtain a heat flow blocking layer that counteracts the hidden heat extraction effect is as follows: The intermittent pulse sequence is sent to the power execution terminal of the paint baking lamp, causing the infrared generator to perform periodic energy injection and physical power-off, and forming a positive thermal gradient; It is understandable that within the radiation-activated section, the high energy density of infrared radiation rapidly establishes a high-temperature zone for cross-linking reaction in the shallow surface of the paint film, creating a positive thermal gradient from the surface of the paint film to the depth of the substrate. After entering the forced shutdown phase, the external energy injection is cut off. The physical potential difference between the natural convection heat dissipation rate of the paint film surface to the ambient air and the heat conduction rate to the interior of the underlying heterogeneous material is used to reduce the high temperature accumulation in the shallow layer. Preferably, the method for obtaining a heat flow blocking layer that counteracts the hidden heat extraction effect is as follows: As the high temperature buildup in the shallow layer is rapidly reduced, the positive thermal gradient from the surface of the paint film to the depth of the substrate is continuously compressed until the positive thermal gradient approaches zero at the end of the shut-off period. By periodically establishing and forcibly zeroing the forward thermal gradient, a virtual boundary layer that blocks the downward penetration of internal energy in the time dimension is established above the physical interface between the paint film and the substrate, thus obtaining the heat flow blocking layer. Understandably, the purpose of constructing a heat flow retardation layer is to: through energy limiting slicing and gradient zeroing timing control, cause the heat flow wavefront losing depth into the substrate to stagnate before reaching the interface due to the loss of temperature and pressure difference. This helps to transform ineffective heat loss into a controllable physical boundary, ensuring that electrical energy is used for the curing phase change of the coating film itself.

[0026] S40. During the forced shutdown segment of the intermittent pulse sequence, the instantaneous cooling slope of the controlled paint surface is extracted and compared with the interface heat leakage flux to obtain the heat leakage attenuation characteristic quantity and evaluate the dynamic decay process of the hidden heat extraction effect to obtain the deep heat storage saturation. Specifically, within the forced shutdown segment of the intermittent pulse sequence, the instantaneous cooling slope of the controlled paint surface is extracted and compared with the interfacial heat leakage flux to obtain the heat leakage attenuation characteristic quantity. In some embodiments, during the physical extinguishing period when the paint baking lamp is in the forced off phase, the surface temperature sequence of the controlled paint surface is sampled at high frequency by an infrared temperature sensor. A sliding window filtering algorithm is applied to the surface temperature sequence to remove high-frequency noise caused by environmental wind speed interference, and smoothed discrete temperature data is extracted. Calculate the first derivative of the time dimension of the smoothed discrete temperature data to obtain the current instantaneous cooling slope of the controlled paint surface within the current pulse cycle; The thermodynamic volumetric heat capacity principle of the controlled paint surface unit area heat capacity parameter in S20 is invoked to convert the current instantaneous cooling slope into the real-time interface heat leakage flux within the current pulse cycle. Preferably, the method for extracting the characteristic quantity of heat leakage attenuation that characterizes the reduction of heat transfer temperature difference is as follows: The initial interfacial heat flux in S20 is retrieved, and the interfacial heat flux is used as the maximum heat flux reference under the physical reference of the substrate in a completely cold state. Calculate the ratio of real-time interface heat flux to initial interface heat flux, perform complementary calculation on the ratio result to obtain a normalized dimensionless parameter between 0 and 1, and define the normalized dimensionless parameter as the heat flux decay characteristic quantity. It should be noted that the complementary calculation process involves subtracting the ratio from the constant 1. It is understandable that as the number of pulses increases, the substrate temperature rises, leading to a reduction in the heat transfer temperature difference. The real-time interface heat leakage flux will inevitably be less than the initial interface heat leakage flux, causing the value of the heat leakage attenuation characteristic quantity to gradually increase from 0 to 1. Among them, the method for obtaining the deep heat storage saturation by measuring the characteristic quantity of heat leakage attenuation and evaluating the dynamic decay process of the hidden heat extraction effect is as follows: During the continuous execution of the intermittent pulse sequence, the calculated heat leakage attenuation characteristic is recorded and stored cycle by cycle, and a time-series evolution curve of the heat leakage attenuation characteristic as the pulse cycle sequence increases is constructed. Extract the first-order difference features of the time-series evolution curve to identify the convergence rate of the heat leakage decay characteristic between adjacent pulse periods; By combining the system's preset substrate thermal conductivity attenuation coefficient, the heat leakage attenuation characteristic of the current period in the time-series evolution curve is weighted and smoothed to obtain a weighted smoothing value, which is used to reduce abrupt disturbances caused by single measurement errors. Preferably, the weighted smoothing process is performed by obtaining the historical smoothed value of the deep heat storage saturation output from the previous pulse cycle, which is recorded in the system memory. The system-preset substrate thermal conductivity depth attenuation coefficient is used as the smoothing weighting factor for the current measurement. The current period's heat leakage attenuation characteristic is multiplied by the smoothing weight factor to obtain the current measurement weight value. Subtract the smoothing weight factor from the constant 1, and multiply the result by the historical smoothed value of deep heat storage saturation output in the previous pulse cycle to obtain the historical cumulative weight value. The current measured weight value is algebraically summed with the historical cumulative weight value to output the weighted smooth value for this period. The weighted smooth value is used as a physical state variable to characterize the degree of temperature rise accumulation inside the bottom heterogeneous material, thus updating the current deep heat storage saturation. Using the execution cycle order of intermittent pulses as the horizontal axis of time and the deep heat storage saturation updated in each cycle as the vertical axis of data, the discrete deep heat storage saturation data points are connected to construct a numerical climbing curve of deep heat storage saturation. Preferably, the method for determining that the physical thermal conductivity temperature difference is continuously decreasing and assessing the dynamic degradation process is as follows: Calculate the instantaneous tangent slope of the numerical climbing curve in the current cycle to obtain the dynamic rate of change of deep thermal saturation. The dynamic rate of change of deep thermal storage saturation is logically compared with the system's preset convergence threshold. If the dynamic change rate of deep heat storage saturation is greater than the convergence threshold, it indicates that the underlying heterogeneous material is still absorbing heat continuously and rapidly, and it is determined that the physical thermal conductivity temperature difference between the controlled paint surface and the underlying heterogeneous material is still in a large range. If the dynamic change rate of deep heat storage saturation is less than or equal to the convergence threshold, it indicates that the rise of deep heat storage saturation is slowing down, and it is determined that the physical thermal conductivity temperature difference between the controlled paint surface and the underlying heterogeneous material has been substantially reduced. Based on the substantial reduction in the physical thermal conductivity temperature difference and the convergence characteristics of the dynamic change rate, an assessment was conducted to confirm that the physical ability of the underlying heterogeneous material to absorb heat has reached the current thermal boundary bottleneck, thus proving that the implicit heat extraction effect is undergoing a dynamic decay process from strong to weak.

[0027] Example 3: like Figure 1 As shown, an energy-saving control method for automotive paint lamps further includes the following steps: S50. Accumulate and analyze the deep heat storage saturation and the transient internal energy of the paint surface to obtain the effective thermal potential energy; evaluate the energy coverage relationship of the effective thermal potential energy to the remaining energy of the paint film, and determine whether to trigger the early melting command based on the energy coverage relationship. If triggered, drive the controlled paint surface into the passive thermal sliding curing stage. The method for obtaining the effective thermal potential energy by combining the deep heat storage saturation with the transient internal energy of the paint surface through accumulation analysis is as follows: Preferably, the transient surface temperature of the current pulse cycle is read by an infrared temperature sensor arranged on the controlled paint surface side; The system acquires the pre-stored parameters of the paint film's mass per unit area and specific heat capacity, and converts the transient surface temperature into the transient internal energy of the paint surface per unit area relative to the standard ambient temperature. The theoretical maximum heat storage equivalent per unit area of ​​the underlying heterogeneous material is retrieved from the system's pre-stored data. The theoretical maximum heat storage equivalent per unit area is then multiplied by the dynamically updated deep heat storage saturation in S40 to obtain the equivalent potential energy per unit area of ​​the underlying heterogeneous material that can currently be fed back outward. The preferred method for performing aggregation analysis is as follows: The transient internal energy of the paint surface and the equivalent potential energy of the substrate per unit area are algebraically summed to obtain the total heat that the current baking system can spontaneously release in the power-off state. The total heat is defined as the effective thermal potential energy. Obtain the standard total curing time set for the coating film process, and subtract the cumulative time that has been continuously heated from the standard total curing time to obtain the remaining cross-linking time for the coating film to reach the fully cured state; Obtain the current system's ambient reference temperature and extract the system's preset minimum critical activity temperature to maintain the uninterrupted polymer crosslinking reaction; Calculate the physical heat transfer temperature difference between the minimum critical activity temperature and the ambient reference temperature; Obtain the comprehensive heat dissipation coefficient per unit area of ​​the current system under similar conditions, which is pre-calibrated by experiments, and multiply the comprehensive heat dissipation coefficient by the physical heat transfer temperature difference to obtain the heat dissipation flux per unit area. The heat dissipation flux is multiplied by the remaining cross-linking time to obtain the heat gap value per unit area required to maintain the cross-linking reaction without external heat source intervention; Preferably, the method for evaluating the relationship between effective thermal potential energy and the remaining energy coverage of the paint film is as follows: The effective thermal potential energy is algebraically subtracted from the heat gap value to calculate the difference in physical quantities between the two. Based on the positive or negative attribute of the difference in physical quantities, it is determined whether the currently accumulated effective thermal potential energy is sufficient to cover the heat required for the remaining cross-linking reaction, and the determination result is used as the energy coverage relationship. The method for determining whether an early melting command is triggered based on the energy coverage relationship, and driving the controlled paint surface into the passive thermal sliding curing stage if triggered, is as follows: If the energy coverage relationship is characterized as the effective thermal potential energy being less than the basic heat gap (i.e., the difference in physical quantities is negative), it is determined that the currently accumulated internal energy is insufficient to support the remaining chemical cross-linking reaction, and the system maintains the original intermittent pulse sequence to continuously inject energy. If the energy coverage relationship is characterized by the effective thermal potential energy being greater than or equal to the basic heat gap (i.e., the difference in physical quantities is positive or zero), it is determined that the static energy reserves inside the system have fully met the remaining dynamic crosslinking requirements. Based on the determination that the energy is sufficient, the system main control unit intercepts and cancels all subsequent heating pulse schedules, and sends an early fuse-breaking command to the power execution terminal to physically cut off the power supply circuit of the paint lamp; After the power supply circuit is cut off, the controlled paint surface immediately enters the passive thermal sliding curing stage without external energy input; Preferably, the heat conduction method during the passive thermal sliding curing stage is as follows: Relying on the reverse heat backflow from the underlying heterogeneous material to the surface paint film, and the delayed release of the paint film's own thermal inertia, the minimum critical active temperature is maintained until the curing process ends. It is understandable that the purpose of triggering the early melting command and driving the controlled paint surface into the passive thermal sliding curing stage is to convert the ineffective heat leakage absorbed by the substrate in the early stage into a feedback heat source in the later stage through real-time energy coverage relationship calculation, thereby reducing the long tail energy consumption at the end of the curing period without sacrificing the cross-linking quality of the paint film and the curing cycle.

[0028] Example 4: Please see Figure 3 As shown, an energy-saving control system for automotive paint lamps includes the following modules: Extraction identification module: used to apply exploratory heating test to the controlled paint surface and simultaneously extract transient thermal diffusion characteristics of the downward heat conduction rate; extract the attenuation steepness of the transient thermal diffusion characteristics to determine whether there is a hidden thermal extraction effect caused by the underlying heterogeneous material in the current baking area; Critical Analysis Module: If a hidden heat extraction effect exists, obtain the inherent thermophysical parameters of the controlled paint surface and perform thermodynamic equivalent conversion to obtain the interfacial heat flux; based on the interfacial heat flux analysis, analyze the maximum energy accumulation boundary for maintaining the local thermal equilibrium of the paint surface to obtain the critical input threshold. The blocking analysis module is used to discretize the preset continuous heating command according to the critical input threshold and generate an intermittent pulse sequence. Based on the intermittent pulse sequence, the paint lamp is driven to alternately execute the radiation on and forced off strategies to obtain a heat flow blocking layer that counteracts the hidden heat extraction effect. The decay assessment module is used to extract the instantaneous cooling slope of the controlled paint surface during the forced shutdown segment of the intermittent pulse sequence and compare it with the interface heat leakage flux to obtain the heat leakage decay characteristics and evaluate the dynamic decay process of the hidden heat extraction effect, and obtain the deep heat storage saturation. Command triggering module: used to accumulate and analyze the deep heat storage saturation and the transient internal energy of the paint surface to obtain the effective thermal potential energy; evaluate the relationship between the effective thermal potential energy and the remaining energy coverage of the paint film, and determine whether to trigger the early melting command based on the energy coverage relationship. If triggered, the controlled paint surface is driven into the passive thermal sliding curing stage.

[0029] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the present invention should still fall within the scope of the present invention.

Claims

1. An energy-saving control method for automotive paint lamps, characterized in that, Includes the following steps: A probing heating test is applied to the controlled paint surface, and the transient thermal diffusion characteristics of the downward heat conduction rate are extracted simultaneously. The attenuation steepness of the transient thermal diffusion characteristics is extracted to determine whether there is a hidden thermal extraction effect caused by the underlying heterogeneous material in the current baking area. If a latent heat extraction effect exists, obtain the inherent thermophysical parameters of the controlled paint surface and perform thermodynamic equivalent conversion to obtain the interfacial heat flux. Based on the analysis of interfacial heat leakage flux, the maximum energy accumulation boundary for maintaining local thermal equilibrium on the paint surface is obtained, and the critical input threshold is derived. The preset continuous heating command is discretized according to the critical input threshold to generate an intermittent pulse sequence; Based on the strategy of driving the paint baking lamp to alternately perform radiation on and forced off based on the intermittent pulse sequence, a heat flow blocking layer that counteracts the hidden heat extraction effect is obtained. Within the forced shutdown segment of the intermittent pulse sequence, the instantaneous cooling slope of the controlled paint surface is extracted and compared with the interfacial heat leakage flux to obtain the heat leakage attenuation characteristic quantity and evaluate the dynamic decay process of the implicit heat extraction effect, thereby obtaining the deep heat storage saturation.

2. The energy-saving control method for automotive paint lamps according to claim 1, characterized in that: The method for extracting the transient thermal diffusion characteristics is as follows: Based on the applied probing heating test, a measurement blind zone delay of a preset duration is initiated; After the measurement blind zone delay ends, discrete temperature data points of the controlled paint surface are collected under the condition of no external heat source input. The discrete temperature data points are serialized and stitched together according to the time axis to construct a cooling time series; From the transient cooling time series, the transient thermal diffusion characteristics of the temperature dropping exponentially over time are extracted using a logarithmic linearization algorithm.

3. The energy-saving control method for automotive paint lamps according to claim 1, characterized in that: The method for analyzing the maximum energy accumulation boundary is as follows: Obtain the calibrated output power of the paint lamp tube under the current supply voltage, and calculate the effective radiation injection power by combining the absorption rate of infrared radiation on the paint surface. By combining the effective radiative injection power and the interface heat leakage flux, a correlation analysis of radiative flux and conduction duration is performed to obtain the maximum energy accumulation boundary.

4. The energy-saving control method for automotive paint lamps according to claim 3, characterized in that: The method for performing the aforementioned correlation calculus analysis is as follows: The effective radiative heat injection flux is used as the heat input term, and the interfacial heat leakage flux is used as the heat loss term. The heat input term is subtracted from the heat loss term to calculate the net heat absorption rate of the controlled paint surface under heating conditions. Among them, the effective radiative injection heat flux is the ratio of the effective radiative injection power to the actual heated area of ​​the controlled paint surface; Extract the heat capacity parameter per unit area from the inherent thermophysical parameters, obtain the maximum allowable temperature rise limit value of the preset paint surface, and multiply the temperature rise limit value by the heat capacity parameter per unit area to obtain the maximum energy storage boundary.

5. The energy-saving control method for automotive paint lamps according to claim 1, characterized in that: The process of obtaining the heat flow blocking layer is as follows: The intermittent pulse sequence is sent to the power execution terminal of the paint baking lamp, causing the infrared generator to perform periodic energy injection and physical power-off, and forming a positive thermal gradient; The positive thermal gradient from the surface of the paint film to the depth of the substrate is continuously compressed until the positive thermal gradient approaches zero at the end of the cutoff phase. By periodically establishing and forcibly zeroing the forward thermal gradient, a virtual boundary layer that blocks the downward penetration of internal energy in the time dimension is established above the physical interface between the paint film and the substrate, thus obtaining the heat flow blocking layer.

6. The energy-saving control method for automotive paint lamps according to claim 5, characterized in that: The method for establishing the intermittent pulse sequence is as follows: Based on the critical input threshold, a dynamic control strategy based on energy integral limiting is constructed; The pre-stored equivalent heat transfer coefficient of the controlled paint surface and the current environmental convective heat transfer coefficient are used to perform a self-dissipation analysis of the driven temperature difference to obtain the natural dissipation time. The natural dissipation time is used as the benchmark duration for the forced shutdown phase that limits heat penetration into the lower layers. By alternating the radiation-on segment and the forced-off segment, which are subject to absolute energy limitations, on the time axis, a time-discrete intermittent pulse sequence is generated.

7. The energy-saving control method for automotive paint lamps according to claim 1, characterized in that: The effective thermal potential energy is obtained by accumulating the deep heat storage saturation and the transient internal energy of the paint surface. The relationship between the effective thermal potential energy and the remaining energy coverage of the paint film is evaluated. Based on the energy coverage relationship, it is determined whether an early melting command is triggered. If it is triggered, the controlled paint surface is driven into the passive thermal sliding curing stage.

8. The energy-saving control method for automotive paint lamps according to claim 7, characterized in that: The energy coverage relationship is established as follows: Obtain the heat gap value, perform an algebraic subtraction operation between the effective thermal potential energy and the heat gap value, and calculate the difference in physical quantities. Based on the positive or negative attribute of the difference in physical quantities, it is determined whether the currently accumulated effective thermal potential energy is sufficient to cover the heat required for the remaining cross-linking reaction, and the determination result is used as the energy coverage relationship.

9. The energy-saving control method for automotive paint lamps according to claim 8, characterized in that: The process of obtaining the heat deficit value is as follows: Obtain the current system's ambient reference temperature and extract the system's preset minimum critical activity temperature to maintain the uninterrupted polymer crosslinking reaction; Calculate the physical heat transfer temperature difference between the minimum critical activity temperature and the ambient reference temperature; Obtain the comprehensive heat dissipation coefficient per unit area of ​​the current environment, and multiply the comprehensive heat dissipation coefficient with the physical heat transfer temperature difference to obtain the heat dissipation flux per unit area. Obtain the remaining crosslinking time, multiply the heat dissipation flux by the remaining crosslinking time, and obtain the heat gap value per unit area.

10. An energy-saving control system for automotive paint lamps, used to implement the energy-saving control method for automotive paint lamps as described in any one of claims 1-9, characterized in that, Includes the following modules: Extraction identification module: used to apply exploratory heating test to the controlled paint surface and simultaneously extract transient heat diffusion characteristics; extract the attenuation steepness of transient heat diffusion characteristics to determine whether there is a hidden heat extraction effect in the current baking area; Critical analysis module: If a hidden heat extraction effect exists, obtain the inherent thermophysical parameters and perform thermodynamic equivalent conversion to obtain the interfacial heat leakage flux; The maximum energy accumulation boundary is established based on the interface heat leakage flux, and the critical input threshold is obtained. The hysteresis analysis module is used to discretize the preset continuous heating command according to the critical input threshold and generate an intermittent pulse sequence. A heat flow blocking layer is obtained by using an intermittent pulse sequence to drive the paint baking lamp to alternately execute radiation on and forced off strategies. The decay assessment module is used to extract the instantaneous cooling slope of the controlled paint surface during the forced shutdown segment of the intermittent pulse sequence and compare it with the interface heat leakage flux to obtain the heat leakage decay characteristics and evaluate the dynamic decay process, thereby obtaining the deep heat storage saturation. Command triggering module: used to perform accumulation analysis on deep heat storage saturation and transient internal energy of paint surface to obtain effective thermal potential energy; Assess the energy coverage relationship and determine whether to trigger the early melting command based on the energy coverage relationship. If triggered, drive the controlled paint surface into the passive thermal sliding curing stage.

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