A self-calibrating air heat aging test apparatus

Abstract

The application discloses a kind of self-calibration air heat aging test equipment, comprising: self-calibration system, for obtaining test equipment workspace temperature and ambient temperature, and air heat aging test equipment heating power is measured;Control system, current actual temperature, ambient temperature and actual air exchange rate of air heat aging test equipment are obtained by calculation processing, and the difference between actual temperature and experimental requirement temperature is used as temperature deviation to correct, the difference between actual air exchange rate and required air exchange rate is used as air exchange rate deviation, and is sent to self-calibration system;Self-calibration system, according to actual air exchange rate data and actual required air exchange rate are compared, control servo motor drives the air exchange fan blade of air heat aging test equipment to rotate, to adjust the air exchange rate of heat aging air test chamber, recalculate actual air exchange rate, update the air exchange rate data of all positions of servo motor rotation, guarantee the accuracy of subsequent air exchange rate adjustment.The application can improve the experimental parameter accuracy and stability of equipment.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of heat aging test equipment, and particularly relates to a self-calibration air heat aging test equipment. BACKGROUND

[0002] The air heat aging test equipment is a common environmental test equipment for heat aging test of experimental samples under the conditions of high temperature and air circulation replacement, and main characteristic parameters thereof are temperature and air exchange rate. Since the box body of the equipment is of a ventilation type rather than a sealed type, there is a certain difference between the temperature fields of upper and lower layers. The conventional method of calculating temperature deviation for correction by taking the center point of the equipment as a reference cannot guarantee the accuracy of the overall temperature of the box body. The air exchange rate is obtained by conversion of the power consumed by the internal heating system in combination with temperature, air specific heat, air density and other comprehensive parameters. Generally, the size of the air exchange hole adjusting valve is manually adjusted according to actual requirements, and then the adjusted air exchange rate is repeatedly measured, and the air exchange rate is adjusted again until the air exchange rate error is within an acceptable range. The calibration process is relatively complex and needs to be calibrated repeatedly for many times.

[0003] The current calibration method has the following problems: 1. It is difficult to guarantee the overall temperature accuracy by correcting the center temperature; 2. There is a certain deviation between the actual working condition and the acquisition method of air specific heat and air density in the air exchange rate calculation parameters; 3. The manual adjustment of the air exchange rate mainly relies on personal experience, and the adjustment error is large; 4. Most of the adjustment needs to be repeatedly measured for many times, and the error is confirmed again for adjustment, which wastes a lot of labor and time cost and has low work efficiency. SUMMARY

[0004] The purpose of the present application is to provide an air heat aging test equipment with a self-calibration function, which accurately measures temperature and air exchange rate by using a self-calibration system, feeds back a signal to an air exchange rate self-calibration system in combination with a difference value of the actual required air exchange rate, and automatically adjusts the air exchange rate error once, thereby eliminating the experience error of manual adjustment, improving work efficiency, and further improving the experimental parameter accuracy and stability of the air heat aging test equipment.

[0005] The technical solution for achieving the purpose of the present application is as follows:

[0006] A self-calibration air heat aging test equipment comprises:

[0007] A self-calibration system is used to measure the temperature inside and outside the air heat aging test equipment to obtain the test equipment working space temperature and the environmental temperature, and to measure the heating power of the air heat aging test equipment.

[0008] A control system receives the data measured by the self-calibration system, and calculates and processes to obtain the current actual temperature t s , the environmental temperature T pand actual ventilation rate N k , the difference between the actual temperature t s and the experimental required temperature t m is corrected as a temperature deviation, and the difference between the actual ventilation rate N k and the required ventilation rate N j is corrected as a ventilation rate deviation, and is sent to the self-calibration system;

[0009] The self-calibration system is used to compare the actual ventilation rate data and the actual required ventilation rate, control the rotation of the ventilation fan blade driven by the servo motor of the air thermal aging test equipment, adjust the ventilation rate of the thermal aging air test chamber, and re-calculate the actual ventilation rate, update the ventilation rate data of all positions of the servo motor, so as to ensure the accuracy of subsequent ventilation rate adjustment.

[0010] Compared with the prior art, the present application has the following advantages:

[0011] The average value of the multi-point temperature measurement in the chamber is used as the actual temperature of the chamber, the temperature deviation is corrected and calibrated, and at the same time, it is used as the test equipment working space temperature when calculating the ventilation rate, which improves the calibration accuracy;

[0012] Since the ventilation rate measurement time is relatively long, the thermal aging experiment is always in a high-temperature ventilation state, and therefore the ambient temperature is always changing during the measurement process, the present application uses the least square method to fit the more accurate environmental temperature change trend by actually measuring the environmental temperature, and then calculates the average air temperature in the time period by integral calculation, and combines the density calculation formula and the constant pressure molar specific heat formula to calculate more accurate specific heat capacity data, instead of the original fixed value or table lookup method, thereby improving the ventilation rate calculation accuracy;

[0013] The ventilation rate single calculation time needs more than 2 hours, and repeated manual calculation and adjustment consumes a lot of cost, the present application uses algorithm memory calibration to control the servo motor to drive the rotating fan blade to adjust the ventilation rate, and through the minimum step angle of the servo motor, the ventilation rate is automatically calibrated once, which improves the ventilation rate calibration accuracy and work efficiency;

[0014] The proportional regulation method is used to update the calibration algorithm data, which can achieve the purpose of rapid adjustment, and can improve the long-term stability of the ventilation rate calibration. DETAILED DESCRIPTION

[0015] Figure 1 It is a module structure diagram of the present application.

[0016] Figure 2 It is an algorithm memory calibration flowchart of the present application.

[0017] Figure 3 It is a ventilation rate data updating process diagram. DETAILED DESCRIPTION

[0018] The specific embodiments of the present application will be further described below with reference to the drawings. It should be noted that the description of these embodiments is used to help understand the present application, but does not constitute a limitation on the present application. In addition, the technical features involved in the various embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0019] The present application provides a self-calibration air heat aging test equipment as shown in Figure 1 The self-calibration air heat aging test equipment mainly comprises a self-calibration system, a control system and a self-calibration system, wherein the self-calibration system is composed of a temperature measurement module and a power measurement module, the control system is composed of a temperature control module, a data processing module and a control interface, and the self-calibration system is composed of an algorithm control module and an automatic adjustment module.

[0020] The self-calibration system comprises a temperature measurement module and a power measurement module;

[0021] The temperature measurement module is configured with 10 probes, 10 calibrated A-grade platinum resistance thermometers are inserted into the probes according to the 1-10 numbering, the corresponding calibration correction values are input into the temperature measurement module, the temperature sensing ends of the platinum resistance thermometers numbered 1-9 are placed on the upper, middle and lower layers in the box, and the positions are respectively the upper 4 corner points, the lower 4 corner points and the geometric center point of the middle layer, the platinum resistance thermometer numbered 10 is placed outside the test equipment and is about 2m away from the air inlet of the test equipment and is on the same horizontal plane with the air inlet, and is at least 1m away from other objects; one-key start self-calibration, when the temperature fluctuation of the platinum resistance thermometers numbered 1-9 is kept within the set fluctuation limit, the system automatically judges that the test equipment enters a stable state, and the average temperature obtained by integrating the temperature data actually measured by the platinum resistance thermometer numbered 10 by using the least square method is taken as the environmental temperature T p The average value of all temperature data of the 9 points measured by the platinum resistance thermometers numbered 1-9 is taken as the actual temperature t s of the box as a whole.

[0022] The power measurement module is connected in series to the terminals of the internal heating system of the test equipment, and measures the heating power of the test box at the same time of temperature measurement.

[0023] The control system

[0024] The temperature control module is composed of a temperature controller and a temperature sensor, wherein the temperature sensor needs to be screened for long-term stability before use, and the temperature controller and the temperature sensor are calibrated as a whole, and the error correction is input to ensure its accuracy and stability; and can receive the temperature deviation sent by the data processing module, and automatically correct the temperature deviation during self-calibration.

[0025] Data processing module: receiving temperature measurement module and power measurement module data, calculating and processing to obtain the current actual temperature t of the test equipment s , ambient temperature T p and actual ventilation rate N k , the difference between the actual temperature t s and the required temperature t m of the experiment as the temperature deviation, sent to the temperature control module for temperature correction; the difference between the actual ventilation rate N k and the required ventilation rate N j as the ventilation rate deviation, sent to the self-calibration system, the ventilation rate parameter of the test equipment is adjusted and calibrated through the control algorithm, and the algorithm data is updated.

[0026] Ventilation rate calculation is obtained by the following formula:

[0027]

[0028] In the formula: N k is the actual ventilation rate, unit: times / h;

[0029] h s is the coefficient (h s = 3600);

[0030] P1 is the average power when the air inlet is closed, unit: W;

[0031] P2 is the average power when the air inlet is opened, unit: W;

[0032] c p is the specific heat capacity of air at normal pressure, unit: J / (g·℃);

[0033] t1 is the ambient temperature, unit: ℃, that is, T p ;

[0034] t2 is the temperature of the test equipment working space, unit: ℃, that is, t s ;

[0035] V is the volume of the test equipment box (including air duct), unit: L;

[0036] d is the environmental air density during the test, unit: g / L.

[0037] Wherein, t2 is equal to t s , representing the actual temperature of the whole equipment box;

[0038]

[0039] In the formula: n is the number of temperature measurement times, m is the number of measurement points, m = 9 in this embodiment; t ijThe temperature value measured for the ith measuring point for the jth time within a specified time, in units of °C.

[0040] The specific heat capacity of air at normal pressure is usually defined as a fixed value of 1.003 J / (g·°C) by industry standards and the like, while the specific heat capacity should be the amount of change with the ambient temperature, and the specific calculation method is as follows:

[0041] uc p = a0 + a1T + a2T 2 + a3T 3

[0042] wherein T is the measured value of the ambient temperature (in K, i.e., the conventional measurement value of Celsius temperature converted into Kelvin temperature), a0, a1, a2, a3 are coefficients related to the molecular formula and name of the gas, and u is a constant;

[0043] The air density is usually obtained by table lookup, but the air density table is usually the corresponding data of the ambient temperature at whole degrees Celsius, and here a more accurate value of the ambient temperature is obtained by least square curve fitting, and the air density table is usually the corresponding data of the ambient temperature at whole degrees Celsius, and in actual situations, the air density d also changes with the ambient temperature, and the specific calculation method is as follows:

[0044]

[0045] wherein T is the measured value of the ambient temperature (in K, i.e., the conventional measurement value of Celsius temperature converted into Kelvin temperature), and P is the conventional standard atmospheric pressure of 101.325 kPa.

[0046] Since the specific heat capacity of air and the air density are both parameters that change with the ambient temperature, and the actual site is not a constant temperature interval, the ambient temperature also changes with time, and the experimental time is also relatively long, therefore, x times of the ambient temperature measured at equal intervals within the experimental time is obtained, and a quadratic term fitting formula of the ambient temperature T is obtained by least square method, i.e.:

[0047] T = b0 + b1t + b2t 2

[0048] wherein t is the time, b0, b1, b2 are the quadratic term coefficients of the ambient temperature changing with time, by inputting the x times of the ambient temperature measured at equal intervals and the corresponding measurement time into MATLAB software, the prediction formula of the air temperature change is calculated by using MATLAB software, and then a quadratic fitting image is plotted by using MATLAB software according to the polynomial fitting method, and the quadratic term coefficients and the curve equation are obtained, so that the ambient temperature at more time points can be more accurately obtained.

[0049] On this basis, by measuring the x times of the ambient temperature value within the specified measurement time and the curve equation obtained by fitting, the average temperature T of the ambient temperature value obtained within the specified measurement time is calculated by the integral formula p As follows:

[0050]

[0051] Wherein, within the specified measurement time, that is, the time interval from time r1 to time r2; the average temperature T p Convert to ℃ to obtain the ambient temperature t1.

[0052] The average temperature calculated by the integral formula method is as follows:

[0053] uc p =a0+a1T p +a2T p 2 +a3T p 3

[0054]

[0055] The quadratic fitting formula of temperature T obtained by the least square method, and the average temperature in the integral calculation period, combined with the constant pressure molar specific heat formula and the dry air density formula, can obtain more real and accurate air specific heat capacity and density data in the actual measurement process environment, and reduce the uncertainty caused by the dynamic change of the environment temperature.

[0056] Operation interface: provide an intuitive interface for users to operate the control system, users can set the device temperature, control the calibration program, update the algorithm parameters (air exchange rate of each position), etc. on the interface, and view the detection calibration results.

[0057] The self-calibration system is composed of an algorithm control module and an automatic adjustment module;

[0058] The automatic adjustment module is used to control the servo motor to drive the air exchange fan blade to rotate, so as to adjust the air exchange rate of the heat aging air test chamber.

[0059] Algorithm control module: compare the actual air exchange rate data obtained by processing with the actual required air exchange rate, and calibrate the test equipment according to the feedback control algorithm, and output to the automatic adjustment module, so as to dynamically adjust the air exchange rate of the heat aging air test chamber. The specific calibration method is as follows:

[0060] Step one: initial calibration records the air exchange rate data N max And Nmin ;

[0061] Step two: the self-calibration system controls the servo motor to rotate the fan blade on the air outlet of the heat aging equipment to adjust the ventilation rate. The servo motor has a minimum step value i (adjustment angle) each time. The calibration records the ventilation rate corresponding to the minimum step value i of the servo motor control adjustment fan blade each rotation, i.e., the ventilation rate N corresponding to the angle (0°+mi) of m rotations mi , the ventilation rate N corresponding to the servo motor rotation i degrees i , the ventilation rate N corresponding to the servo motor rotation 2i degrees 2i , and so on. Thus, the ventilation rate difference between each step value is obtained, where m=0, 1, 2, 3...M, and M=360 / i. It should be noted that the ventilation rate difference between each step value is not the same.

[0062] Step three: according to the current position ventilation rate of the ventilation fan blade obtained by automatic measurement after the start of self-calibration, the deviation between the current position ventilation rate and the required ventilation rate is determined. If the required ventilation rate is not met, the actual ventilation rate N k corresponding to the current automatic adjustment angle ki of the servo motor is obtained, and the deviation Z between the actual ventilation rate N j and the required ventilation rate N j is obtained. Z=N k -N (k±p)i . The p-time ventilation rate difference before and after the current position of the ventilation fan blade located at the k-time rotation position of the servo motor is compared with the deviation Z. The p-time ventilation rate difference before and after the current position is N k -N j , where the plus-minus (±) p is determined by the positive or negative value of the deviation Z. When it is positive, Z=N k >0, indicating that the ventilation rate adjusted by the initial calibration does not meet the required ventilation rate, and the servo motor needs to be rotated in the opposite direction to adjust the fan blade angle and increase the ventilation rate. When it is negative, Z=N j -N k <0, indicating that the ventilation rate adjusted by the initial calibration exceeds the required ventilation rate, and the servo motor needs to be rotated in the opposite direction to adjust the fan blade angle and decrease the ventilation rate. The ventilation rate difference closest to the deviation Z is taken. Through the ventilation rate difference combined with the ventilation rate difference between each minimum step value of the initial calibration, the required rotation number p of the servo motor can be accurately obtained. According to the number, the servo motor is adjusted to adjust the ventilation rate to the required ventilation rate.

[0063] Step four: after adjusting the ventilation rate of the heat aging test equipment, the ventilation rate is automatically recalculated, and the symbol N cs, the self-calibration process is ended, and the ventilation rate data of all positions are updated according to the ventilation rate data of the blade position and the initial calibration data. The specific method is as follows (as shown in Figure 3 : the long strip represents the ventilation rate from 360° (full closure) to 0° (full opening), and the small squares represent the ventilation rate change corresponding to the minimum step value of the servo motor rotation. The required ventilation rate N j and the difference Y between the initial ventilation rate at 360° (full closure).

[0064] X=N max -N j

[0065] Y=N j -N min ;

[0066] Determine the proportion of ventilation rate difference X and ventilation rate difference Y in the total ventilation rate difference, that is

[0067] X / (N max -N min ) = k,

[0068] Y / (N max -N min ) = 1-k;

[0069] Determine the recalculated ventilation rate N cs and the proportion of the difference between the initial ventilation rate at 0° (full opening) and the difference between the initial ventilation rate at 360° (full closure), that is (N max -N cs ) / (N max -N min ) and (N cs -N min ) / (N max -N min ).

[0070] Determine the proportion of the 360° (full closure) initial ventilation rate to the recalculated ventilation rate N cs This part of the proportion coefficient a, a·(N max -N cs ) / (N max -N min ) = k, then by calculation, a = (N j -N min ) / (N cs -N min ).

[0071] Determine the proportion of the recalculated ventilation rate N csThe proportion coefficient b of the initial ventilation rate from 0° (fully open) to 360° (fully closed) is b · (N max -N cs ) / (N max -N min ) = 1-k, then by calculation, b = (N max -N j ) / (N max -N cs );

[0072] Update the initial ventilation rate of 360° (fully closed) to the newly calculated ventilation rate N cs This part is the ventilation rate change corresponding to the minimum step value of each servo motor rotation, that is, the initial calibration of the ventilation rate change corresponding to the minimum step value of the servo motor rotation is multiplied by the proportion coefficient a;

[0073] Update the newly calculated ventilation rate N cs This part is the ventilation rate change corresponding to the minimum step value of each servo motor rotation from 0° (fully open) to 360° (fully closed), that is, the initial calibration of the ventilation rate change corresponding to the minimum step value of the servo motor rotation is multiplied by the proportion coefficient b;

[0074] Thus, the ventilation rate calibration of all positions of the servo motor rotation 0-M times is completed, which can ensure the long-term effectiveness of the algorithm.

[0075] Although the embodiments of the present application have been shown and described above, it should be understood that the above-mentioned embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above-mentioned embodiments within the scope of the present application.

Claims

1. A self-calibrating air heat aging test apparatus, characterized by, The control system comprises: The self-calibration system is used to measure the temperature inside and outside the air heat aging test equipment to obtain the test equipment working space temperature and the ambient temperature, and to measure the heating power of the air heat aging test equipment; The control system receives the data measured by the self-calibration system, calculates and processes the current actual temperature t of the air thermal aging test equipment s , the ambient temperature T p , and the actual ventilation rate N k , corrects the difference between the actual temperature t s and the required temperature t m as the temperature deviation; the difference between the actual ventilation rate N k and the required ventilation rate N j as the ventilation rate deviation, and sends it to the self-calibration system; The self-calibration system is used to compare the actual air exchange rate data with the actual required air exchange rate, control the servo motor to drive the air exchange fan blade of the air heat aging test equipment to rotate, adjust the air exchange rate of the heat aging air test chamber, recalculate the actual air exchange rate, and update the air exchange rate data of all positions of the servo motor rotation to ensure the accuracy of subsequent air exchange rate adjustment. The self-calibration system comprises: The algorithm control module is used to calibrate the air exchange rate of the air heat aging test equipment according to the comparison between the actual air exchange rate data and the actual required air exchange rate, and output to the automatic adjustment module to dynamically adjust the air exchange rate of the heat aging air test chamber. The specific process of calibrating the air exchange rate of the air heat aging test equipment by the algorithm control module comprises: Initial calibration recording the data N of the ventilation rate of the control adjustment fan at 0° and 360° cover state of the ventilation hole max and N min ; The control servo motor drives the fan blade on the air thermal aging box outlet to rotate to adjust the air exchange rate. The servo motor has a minimum step value i each time, and the air exchange rate corresponding to the minimum step value i of the servo motor control adjustment fan blade rotation each time is calibrated and recorded, that is, the air exchange rate corresponding to the angle of m rotations is calibrated and recorded mi , and the air exchange rate difference between each step value is obtained. According to the current position ventilation rate of the ventilation fan blade obtained by automatic measurement after the self-calibration starts, according to the deviation of the current position ventilation rate and the required ventilation rate, it is judged whether it meets the required ventilation rate requirement, if it does not meet the requirement, the actual ventilation rate N corresponding to the current automatic adjustment angle ki of the servo motor is obtained k The deviation Z of the required ventilation rate N of the user j Z=N j -N k , combined with the ventilation rate difference value of the ventilation fan blade located in the current rotation k times position of the servo motor before and after p times rotation and the deviation Z, the p times ventilation rate difference value before and after the current position is N (k±p)i -N k ; when Z=N j -N k >0, the servo motor rotates reversely to adjust the blade angle and increase the ventilation rate; when Z=N j -N k <0, the servo motor rotates forward to adjust the blade angle and reduce the ventilation rate; and the ventilation rate difference value closest to the deviation Z is obtained, the number p of required rotations of the servo motor is obtained, and the servo motor is adjusted according to the number to adjust the ventilation rate to the required ventilation rate; After the air change rate of the air heat aging test equipment is adjusted, the air change rate is automatically recalculated, and the symbol N cs is used to represent that the self-calibration process is ended after meeting the requirements, and the air change rate data of all positions is updated according to the air change rate data of the fan blade position and the initial calibration data.

2. The self-calibrating air heat aging test apparatus of claim 1, wherein, The control system comprises: The temperature control module is used to receive the temperature deviation sent by the data processing module and automatically correct the temperature deviation of the air heat aging test equipment. A data processing module is configured to receive data measured by the self-calibration system, and calculate and process the current actual temperature t of the air thermal aging test device s , the ambient temperature T p , and the actual ventilation rate N k . where the actual ventilation rate N k is obtained by the formula: where h s is a coefficient, P1 is the average power when the inlet is closed, P2 is the average power when the inlet is open, c p is the specific heat capacity of air at normal pressure, V is the volume of the test equipment box, d is the density of the ambient air during the test, t1 is the ambient temperature, converted from degrees Kelvin to degrees Celsius; t2 is the temperature of the test equipment working space; ambient temperature T p is converted from degrees Kelvin to degrees Celsius; t2 is the temperature of the test equipment working space; ambient temperature T p The calculation process is: The quadratic term fitting formula of the ambient temperature T is obtained by the least square method through x times of environment temperature measured at equal intervals in the experimental time, that is: T = b0+ b1t + b2t 2 Where t is time, b0, b1, b2 are the quadratic term coefficients of the ambient temperature changing with time, and the quadratic term coefficients are obtained by the polynomial fitting method according to the x times of environment temperature measured at equal intervals and the corresponding measurement time, and the air temperature at each time point is obtained. By stipulating the measured x times of ambient temperature values within the measurement time and the obtained curve equation by fitting, the average temperature T of the ambient temperature values within the stipulated measurement time is calculated by the integral formula p As follows: Wherein, in the specified measurement time, that is, the time interval from time r1 to time r2. Current actual temperature t s The calculation is: wherein: n is the number of measurements at each temperature point, m is the number of measurement points, t ij is the temperature value measured at the i-th measurement point at the j-th time within the specified time.

3. The self-calibrating air heat aging test apparatus of claim 2, wherein, The control system comprises: the average air temperature is calculated by using the integral formula of air specific heat capacity and air density: uc p = a0+ a1T p + a2T p 2 + a3T p 3 a0, a1, a2, a3 are coefficients related to the molecular formula and name of the gas, and u is a constant; P is the standard atmospheric pressure.

4. The self-calibrating air heat aging test apparatus of claim 1, wherein, The self-calibration system further comprises: The automatic adjustment module is used to control the servo motor to drive the air exchange fan blade of the air heat aging test equipment to rotate to adjust the air exchange rate of the heat aging air test chamber.

5. The self-calibrating air heat aging test apparatus of claim 1, wherein, The update specific method is: calculating the required ventilation rate N j Difference X between the initial ventilation rate of 0°, difference Y between the initial ventilation rate of 360°: X = N max - N j Y = N j - N min ; The proportion k and 1-k of the air exchange rate difference X and the air exchange rate difference Y in the total air exchange rate difference are determined, that is X / (N max -N min ) = k, Y / (N max -N min ) = 1 - k; determining the recalculation of the ventilation rate N cs the difference between the initial ventilation rate at 0° and the difference between the initial ventilation rate at 360° as a proportion of (N max -N cs ) / (N max -N min ) and (N cs -N min ) / (N max -N min ). Determination of the 360° initial ventilation rate to be adjusted to the recalculated ventilation rate N cs The proportionality coefficient a of this part: a = (N j -N min ) / (N cs -N min ); Determination of the readjusted ventilation rate N that needs to be recalculated cs The proportionality factor b for the initial ventilation rate in this part of the range from 0° to 0°: b = (N max -N j ) / (N max -N cs ); Update the calibrated 360° initial minute ventilation to the newly calculated minute ventilation N cs This part is the change of minute ventilation corresponding to the minimum step value of each servo motor rotation, that is, the change of minute ventilation corresponding to the minimum step value of the initial calibrated servo motor rotation multiplied by the proportionality coefficient a; The update calibration recalculates the ventilation rate N cs The initial ventilation rate to 0° is the ventilation rate change corresponding to each minimum step value of the servo motor rotation, that is, the ventilation rate change value corresponding to the minimum step value of the servo motor rotation in the initial calibration is multiplied by the proportional coefficient b; Thus, the air exchange rate data of all positions of the servo motor rotation 0-M times is updated.

6. The self-calibrating air heat aging test apparatus of claim 1, wherein, The control system further comprises an operation interface: an intuitive interface for users to operate the control system to set the temperature of the air heat aging test equipment, control the calibration program, update the parameters, and view the detection calibration results.

Images