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CN-121971231-A - Light variation control method and system of electrodeless light variation mask

CN121971231ACN 121971231 ACN121971231 ACN 121971231ACN-121971231-A

Abstract

The invention relates to the technical field of electrodeless dimming masks, and discloses a dimming control method and a dimming control system of an electrodeless dimming mask, wherein the method comprises the steps of collecting the ambient light intensity and the welding arc intensity of the welding mask along with time, and presetting a light transmittance threshold for dynamic adjustment, wherein the light transmittance threshold comprises a maximum value and a minimum value; the method comprises the steps of storing current light transmittance, light intensity data, an adjusted threshold value and a time stamp as a historical data set, storing light transmittance adjusting power and the time stamp as a light variation control data set, matching an optimal historical record from historical data when the intensity of welding arc exceeds an adjusted threshold value range, extracting corresponding adjusting power as initial power, setting dynamic checking interval time, starting a timer after the first adjustment, and carrying out secondary judgment when the dynamic checking interval time arrives. The invention can more accurately and rapidly realize electrodeless dimming control and improve the visual definition and safety of welders.

Inventors

  • WANG SHIXIONG
  • SHE DINGSHUN
  • LI WEI

Assignees

  • 深圳市凯科兴科技有限公司

Dates

Publication Date
20260505
Application Date
20251202

Claims (10)

  1. 1. The light variation control method of the electrodeless light variation mask is characterized by comprising the following steps of: Collecting the ambient light intensity and the welding arc light intensity of the welding mask along with time, and dynamically adjusting a preset light transmittance threshold through a nonlinear compensation model, wherein the light transmittance threshold comprises a maximum value and a minimum value; Storing the current light transmittance, the light intensity data, the adjusted threshold value and the time stamp as a historical data set, and storing the light transmittance adjustment power delta P and the time stamp as a light variation control data set; when the welding arc intensity exceeds the adjusted threshold range, matching the optimal historical record from the historical data set through a similarity algorithm, and extracting the corresponding adjusted power as initial power delta P 0 ; Setting a dynamic checking interval time, starting a timer after the first adjustment, and performing secondary judgment when the dynamic checking interval time arrives: If the welding arc intensity exceeds the threshold range, calculating an error compensation amount delta E and generating a correction power delta P' =delta P 0 multiplied by f (delta E); and if the welding arc intensity is in the threshold range, keeping the current power unchanged.
  2. 2. The light variation control method of the electrodeless light variation mask according to claim 1, wherein when the preset light transmittance threshold is dynamically adjusted by a nonlinear compensation model, the maximum value and the minimum value of the adjusted light transmittance threshold are as follows: The maximum value of the threshold value is equal to the product of the initial maximum value and an exponential function, the exponential term of the exponential function is the inverse number of the negative first dynamic coefficient multiplied by the ratio of the welding arc intensity to the unit value, the minimum value of the threshold value is equal to the sum of the initial minimum value and the product of one added with the second dynamic coefficient multiplied by the square root of the difference value between the welding arc intensity and the ambient light intensity, the first dynamic coefficient and the second dynamic coefficient meet the following relation that the first dynamic coefficient is equal to the constant 0.1 multiplied by 1 added with the ratio of the standard deviation of the ambient light intensity to the mean value thereof multiplied by 0.5, and the second dynamic coefficient is equal to the constant 0.05 multiplied by 1 added with the ambient light intensity and takes minus 0.3 as the exponential function value of the bottom index; The welding arc light intensity represents the current working light source intensity, the ambient light intensity represents the current background illumination level, the standard deviation and the average value of the ambient light intensity respectively reflect the fluctuation and the average level of the illumination level, the initial maximum value and the minimum value are the upper limit and the lower limit of a set light transmittance threshold interval, and the adjusted maximum value and minimum value are the actual control range obtained by dynamic compensation calculation.
  3. 3. The light variation control method of the electrodeless light variation mask according to claim 1, wherein the calculation method of the dynamic inspection interval time is as follows: And constructing a proportion term by using the ratio between the basic checking interval time and the unit time change quantity of the welding arc intensity and the light intensity change rate reference value, and when the proportion term is larger than 1, amplifying the basic interval time by using the proportion term as a factor, otherwise, keeping the basic interval time unchanged or performing linear fine adjustment, wherein the light intensity change rate reference value is a fixed constant and is used for measuring an evaluation base line of the change rate, and the unit time change quantity of the welding arc intensity is obtained by dividing the intensity difference between the current moment and the previous moment by the interval time.
  4. 4. The method for controlling the light variation of the electrodeless light variation mask according to claim 1, wherein the similarity algorithm adopts a dynamic time warping algorithm to calculate the matching degree of the current welding arc intensity data sequence and the historical welding arc intensity data sequence, and the method comprises the following steps: a) Z-score normalization is carried out on the current welding arc intensity data sequence and the historical welding arc intensity data sequence; b) Constructing an accumulated cost matrix of (n+1) x (m+1), wherein n and m are the length of the sequence; c) Calculating the minimum path cumulative cost: Traversing cost values among any group of path points formed by the current welding arc intensity data index and the historical data index, and the path points adjacent to the upper part, the left part and the left upper part, and taking the result with the smallest sum of accumulated cost in the three as the accumulated cost value of the path point, wherein the cost value is an absolute difference value between light intensity values corresponding to the current path point and the connected path point and is used for measuring the deviation degree of the current data and the historical data on the path point; d) When the minimum path cumulative cost is less than the similarity threshold epsilon, a valid match is determined.
  5. 5. The light variation control method of the electrodeless light variation mask according to claim 1, wherein the error compensation amount Δe is calculated by: Dividing the difference between the current intensity and the upper limit by the upper limit to obtain a first error compensation amount when the current welding arc intensity exceeds the upper limit of the dynamically adjusted threshold value; the correction coefficients of the first error compensation quantity and the second error compensation quantity are determined in a segmentation expression mode according to the numerical interval of the error compensation quantity: when the error compensation amount is greater than 0.3, the correction coefficient is equal to 1 plus twice the error compensation amount; When the error compensation amount is between 0.1 and 0.3, the correction coefficient is equal to 1 plus the error compensation amount multiplied by 0.8, and when the error compensation amount is between 0 and 0.1, the correction coefficient is equal to 1 plus the error compensation amount multiplied by 0.2.
  6. 6. The method for controlling the light variation of the electrodeless dimming mask according to claim 1, further comprising activating multi-sensor fusion detection when the welding arc intensity is still beyond a threshold range after three continuous adjustments, acquiring the welding arc intensities in N directions through N sensors, calculating weighted effective arc intensities, and then using the weighted effective arc intensities to replace the welding arc intensities for threshold judgment, wherein the weighted effective arc intensities are calculated in the following manner: multiplying the welding arc intensity measured by each sensor with the corresponding weighting coefficient one by one, wherein the sum of the obtained products is used as a molecule of the weighting intensity; The weighting coefficient of each sensor is calculated according to the angle difference between the installation angle and the reference direction of the main sensor, specifically, the absolute value of the angle difference is added with a value obtained by reciprocal, and the value is taken as the weighting coefficient of the sensor; the main sensor is a reference sensor of a preset reference direction, and the weights of other sensors are reduced along with the increase of the angle deviation degree.
  7. 7. The light variation control method of the electrodeless dimming mask as claimed in claim 1, wherein when calculating the error compensation amount Δe and generating the correction power, the steps are performed with the following priority: a quick response stage, namely when the absolute value of the difference between the welding arc intensity and the current light transmittance threshold exceeds 30% of the set threshold, starting a full-power adjustment mode, and changing the light transmittance at the maximum adjustment rate; The accurate adjustment stage is that when the absolute value of the difference value is 10% -30% of the set threshold value, a progressive adjustment mode is started, and the adjustment speed is in direct proportion to the difference value; a steady-state maintaining stage, when the absolute value of the difference value is smaller than 10% of the set threshold value, starting a fine adjustment mode, and carrying out pulse correction of light transmittance smaller than 1% in a fixed period; wherein the set threshold is 20% of the difference between the maximum value and the minimum value of the light transmittance after adjustment.
  8. 8. The method for controlling light variation of an electrodeless dimming mask as claimed in claim 1, further comprising an emergency control procedure: Mutation detection, namely judging an environmental mutation event when the variation difference value of two adjacent environmental light intensity samples exceeds 3 times of the previous difference value; Safety locking, namely immediately switching the light transmittance to a preset fixed safety level and lasting at least 200ms; recovery verification, during the safe locking period, detecting the stability of the ambient light every 50ms, and unlocking when the fluctuation of continuous 3 times of sampling is less than 5%; data reset, namely after unlocking, clearing the history data set record within 100ms before mutation occurs.
  9. 9. The method of light variation control of an electrodeless light variation mask according to claim 1, further comprising trend predictive control: the characteristic extraction, namely recording the rising edge slope, the falling edge slope and the fluctuation frequency of the welding arc light intensity in the last 500 ms; pattern matching, namely performing similarity comparison on the currently extracted features and a pre-stored typical welding pattern library, wherein the pattern library at least comprises the following components: Arc strike mode with slope >500 lx/ms and frequency <5Hz; A molten drop transition mode, wherein the slope is 100-300 lx/ms and the frequency is 10-20Hz; Abnormal splash mode, slope >800 lx/ms and frequency >50Hz; And (3) forward-looking control, namely when the specific mode is matched, starting the light transmittance adjustment 50-100ms in advance before detecting the complete light intensity change.
  10. 10. A light variation control system of an electrodeless light variation mask for realizing the light variation control method of the electrodeless light variation mask as set forth in any one of claims 1 to 9, comprising: The dynamic light intensity acquisition module is configured to acquire the ambient light intensity and the welding arc light intensity of the electric welding mask along with time, and activate multi-sensor fusion detection to acquire light intensity data in N directions when the welding arc light intensity still exceeds a threshold range after three continuous adjustments; The dynamic threshold adjustment module is configured to match the optimal historical record from the historical data set through a similarity algorithm when the welding arc intensity exceeds the adjusted threshold range, extract the corresponding adjustment power as initial power delta P 0 , set a dynamic checking interval time, start a timer after the first adjustment, and perform secondary judgment when the dynamic checking interval time arrives, if the welding arc intensity exceeds the threshold range, calculate an error compensation quantity delta E and generate correction power delta P' =delta P 0 xf (delta E); The system comprises a phasing control module, a gradual adjustment module and a fine adjustment module, wherein the phasing control module is configured to execute the following priority when the initial power is adjusted according to the difference value between the welding arc intensity and the light transmittance threshold value, wherein the full power adjustment mode is started to change the light transmittance at the maximum adjustment rate when the absolute value of the difference value between the welding arc intensity and the current light transmittance threshold value exceeds 30% of the set threshold value, the gradual adjustment mode is started when the absolute value of the difference value is 10% -30% of the set threshold value, the adjustment rate is in direct proportion to the difference value, and the fine adjustment mode is started to perform pulse correction of less than 1% of the light transmittance at a fixed period when the absolute value of the difference value is less than 10% of the set threshold value; The emergency processing module is configured to judge an environmental mutation event when the variation difference value of two adjacent ambient light intensity samples exceeds 3 times of the previous difference value, immediately switch the light transmittance to a preset fixed safety level for at least 200ms, detect the ambient light stability every 50ms during the safety locking period, unlock the device when the fluctuation of 3 continuous samples is less than 5%, and clear the history data set record in 100ms before the mutation occurs after unlocking; The trend prediction module is configured to record the rising edge slope, the falling edge slope and the fluctuation frequency of the welding arc intensity within the last 500ms, compare the similarity of the currently extracted features with a prestored typical welding mode library, and when the currently extracted features are matched with a specific mode, start light transmittance adjustment 50-100ms in advance before detecting the complete light intensity change.

Description

Light variation control method and system of electrodeless light variation mask Technical Field The invention relates to the technical field of electrodeless dimming masks, in particular to a dimming control method and a dimming control system of an electrodeless dimming mask. Background During the welding operation, the welding arc light generates intense visible light, ultraviolet light and infrared light, and the radiation can cause harm to eyes of a welder (such as electro-optical ophthalmia) and can influence welding quality. Accordingly, welders are often required to wear welding shields to prevent direct irritation of the eyes by glare. The traditional welding mask is mainly divided into a fixed light-changing mask and an automatic light-changing mask. The light transmittance of the optical filter for fixing the light-changing mask is fixed, and a welder needs to manually select a proper light filtering grade before welding, but frequently removes the mask before and after welding or when the welding line needs to be observed, so that the working efficiency is affected. The automatic light-changing mask utilizes a Liquid Crystal Filter (LCF) technology, and can automatically adjust the light transmittance according to the intensity of welding arc light, so that a welder does not need to manually adjust in the welding process, and the operation convenience and safety are greatly improved. However, both the fixed light-changing mask and the automatic light-changing mask have certain limitations in light transmittance adjustment, namely continuous and smooth adjustment of light transmittance, and if the light transmittance changes too fast, a user wears the mask, the visual field is suddenly dark and bright, and if the light transmittance changes too slow, welding arc light is generated first and then adjustment is performed. Whatever the case, the meaning of wearing the mask is lost, and finally the light adaptability in the welding process is insufficient, so that the visual comfort and the welding quality of a welder are affected. Therefore, how to realize more accurate and rapid electrodeless dimming control and improve the visual definition and safety of welders is a problem to be solved in the prior art. Disclosure of Invention In view of the above, the invention provides a light variation control method of an electrodeless light variation mask, which aims to solve the problems that the prior art cannot realize more accurate and rapid electrodeless light variation control and improve the visual definition and safety of welders. On one hand, the light variation control method of the electrodeless light variation mask comprises the steps of collecting the ambient light intensity and the welding arc light intensity of the electric welding mask along with time, and dynamically adjusting a preset light transmittance threshold through a nonlinear compensation model, wherein the light transmittance threshold comprises a maximum value and a minimum value; Storing the current light transmittance, the light intensity data, the adjusted threshold value and the time stamp as a historical data set, and storing the light transmittance adjustment power delta P and the time stamp as a light variation control data set; When the welding arc intensity exceeds the adjusted threshold range, matching the optimal historical record from the historical data set through a similarity algorithm, and extracting the corresponding adjustment power as initial power delta P0; Setting a dynamic checking interval time, starting a timer after the first adjustment, and performing secondary judgment when the dynamic checking interval time arrives: If the welding arc intensity exceeds the threshold range, calculating an error compensation amount delta E and generating a correction power delta P' =delta P0×f (delta E); and if the welding arc intensity is in the threshold range, keeping the current power unchanged. Further, when the preset light transmittance threshold is dynamically adjusted through the nonlinear compensation model, the maximum value and the minimum value of the adjusted light transmittance threshold are as follows: The maximum value of the threshold value is equal to the product of the initial maximum value and an exponential function, the exponential term of the exponential function is the inverse number of the negative first dynamic coefficient multiplied by the ratio of the welding arc intensity to the unit value, the minimum value of the threshold value is equal to the sum of the initial minimum value and the product of one added with the second dynamic coefficient multiplied by the square root of the difference value between the welding arc intensity and the ambient light intensity, the first dynamic coefficient and the second dynamic coefficient meet the following relation that the first dynamic coefficient is equal to the constant 0.1 multiplied by 1 added with the ratio of the standard deviation of the ambient