Temperature and humidity linear control method and device for environmental test equipment

Abstract

The invention discloses a temperature and humidity linear control method and device for environmental test equipment, and the method comprises the following steps: carrying out the temperature and humidity control test of the environmental test equipment, and calculating a temperature and humidity mapping matrix according to the result of the temperature and humidity control test; according to the preset target temperature and the preset target humidity, the heating amount and the humidifying amount are calculated through a preset mapping formula; wherein the preset mapping formula comprises the temperature and humidity mapping matrix; and performing temperature and humidity control on the environmental test equipment according to the heating amount and the humidifying amount. The adjusting efficiency of the temperature and humidity in the environment test box can be improved.

Description

Technical Field

[0001] The invention relates to the field of environmental testing, and in particular to a temperature and humidity linear control method and device for environmental testing equipment. Background Art

[0002] During the production, storage and use of various materials, electromechanical parts and components, and complete products, they will be affected by various environmental stresses (such as temperature, humidity, air pressure, solar radiation, rain, mold, salt spray, dust, etc.). Environmental test chambers (hereinafter referred to as test chambers) include: constant temperature and humidity test chambers, alternating humidity and heat test chambers, rapid temperature change test chambers, hot and cold shock test chambers, mold test chambers, salt spray test chambers, etc. The test chamber is an essential test equipment for conducting various environmental stress tests, detecting and verifying the environmental adaptability of products, and evaluating the quality and reliability of products.

[0003] When the environmental test chamber needs to adjust the internal temperature and humidity, the evaporation or condensation rate of water is not only related to the temperature and relative humidity, but also to the shape and size of the test chamber working space, the surface roughness of the material of the test chamber and other factors. Therefore, the system needs to control the temperature and relative humidity of the test chamber working space at the same time. The temperature of the test chamber working space is not only related to the heating amount, but also to the humidification amount; the relative humidity of the test chamber working space is not only related to the humidification amount, but also to the heating amount.

[0004] There are currently a variety of mature temperature and humidity control technologies for test chambers with temperature and humidity test functions, but they generally have disadvantages such as complex control algorithms, high execution cost of the control process, and unsatisfactory results. Summary of the invention

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides a temperature and humidity linear control method and device for environmental testing equipment, which can improve the regulation efficiency of the temperature and humidity inside the environmental testing box.

[0006] An embodiment of the present invention provides a temperature and humidity linear control method for environmental testing equipment, comprising the following steps:

[0007] Performing a temperature and humidity control test on the environmental test equipment, and calculating a temperature and humidity mapping matrix according to the results of the temperature and humidity control test;

[0008] According to the preset target temperature and the preset target humidity, the heating amount and the humidification amount are calculated by a preset mapping formula; wherein the preset mapping formula includes the temperature and humidity mapping matrix;

[0009] The temperature and humidity of the environmental testing equipment are controlled according to the heating amount and the humidification amount.

[0010] Furthermore, the temperature and humidity control test of the environmental test equipment specifically includes:

[0011] According to the preset first heating amount, the preset first humidification amount and the preset second heating amount, the preset second humidification amount, the environmental test equipment is controlled twice in temperature and humidity;

[0012] After the internal temperature and humidity of the environmental test equipment reach a stable equilibrium state, the internal temperature and internal humidity of the environmental test equipment after two temperature and humidity controls are recorded respectively, and the first test temperature and first test humidity and the second test temperature and second test humidity are obtained correspondingly.

[0013] Preferably, the recording of the internal temperature and internal humidity of the environmental test equipment after two temperature and humidity controls specifically includes:

[0014] After the internal temperature and humidity of the environmental testing equipment reach a stable equilibrium state, the internal temperature is recorded by a preset temperature sensor, and the internal humidity is recorded by a preset humidity sensor; wherein the preset temperature sensor and the preset humidity sensor are both arranged inside the environmental testing equipment.

[0015] Furthermore, the temperature and humidity mapping matrix is ​​calculated based on the results of the temperature and humidity control test, specifically including:

[0016] Assume that the preset first heating amount and the preset first humidification amount are U1 and V1 respectively, the preset second heating amount and the preset second humidification amount are U2 and V2 respectively, the first test temperature and the first test humidity are X1 and Y1 respectively, the second test temperature and the second test humidity are X2 and Y2 respectively, and the temperature and humidity mapping matrix is Then the mapping relationship is:

[0017]

[0018] According to the mapping relationship, we can get:

[0019]

[0020] The calculation results of a, b, c, and d are respectively substituted to obtain the temperature and humidity mapping matrix.

[0021] Further, the heating amount and the humidification amount are calculated by a preset mapping formula according to the preset target temperature and the preset target humidity, specifically including:

[0022] Assuming that the preset target temperature is X and the preset target humidity is Y, the preset mapping formula is specifically:

[0023]

[0024] Wherein, U is the heating amount, and V is the humidification amount.

[0025] Further, the temperature and humidity of the environmental test equipment are controlled according to the heating amount and the humidification amount, specifically including:

[0026] The heating amount is sent to the preset heater through the preset main control center, and the humidification amount is sent to the preset humidifier, so that the preset heater heats the environmental test equipment according to the heating amount, and the preset humidifier humidifies the environmental test equipment according to the humidification amount.

[0027] Preferably, the preset main control center is specifically TEMI 990, the preset heater is specifically a hot air heater, and the preset humidifier is specifically an electric heating evaporative humidifier.

[0028] Another embodiment of the present invention provides a temperature and humidity linear control device for environmental testing equipment, comprising: a parameter calculation module, a control amount calculation module and a control module;

[0029] The parameter calculation module is used to perform a temperature and humidity control test on the environmental test equipment, and calculate a temperature and humidity mapping matrix according to the results of the temperature and humidity control test;

[0030] The control amount calculation module is used to calculate the heating amount and the humidification amount according to the preset target temperature and the preset target humidity through a preset mapping formula; wherein the preset mapping formula includes the temperature and humidity mapping matrix;

[0031] The control module is used to control the temperature and humidity of the environmental testing equipment according to the heating amount and the humidification amount.

[0032] Furthermore, the parameter calculation module is used to perform a temperature and humidity control test on the environmental test equipment, specifically including:

[0033] The environmental test equipment is subjected to temperature and humidity control twice, and after the internal temperature and humidity of the environmental test equipment reach a stable equilibrium state, the internal temperature and internal humidity of the environmental test equipment after the two temperature and humidity controls are recorded respectively, and the first test temperature, the first test humidity and the second test temperature, the second test humidity are obtained correspondingly.

[0034] Furthermore, the control module is used to control the temperature and humidity of the environmental test equipment according to the heating amount and the humidification amount, specifically including:

[0035] The heating amount is sent to the preset heater through the preset main control center, and the humidification amount is sent to the preset humidifier, so that the preset heater heats the environmental test equipment according to the heating amount, and the preset humidifier humidifies the environmental test equipment according to the humidification amount.

[0036] Compared with the prior art, the beneficial effects of the present invention are:

[0037] The mapping relationship between the external heating and humidification acting on the inside of the environmental test chamber and the internal temperature and humidity is obtained through experiments, which can improve the accuracy and efficiency of temperature and humidity control of environmental test equipment. The control method is simple to operate and low in cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 A schematic flow chart of a method for linearly controlling temperature and humidity of an environmental testing device provided in accordance with an embodiment of the present invention.

[0039] Figure 2 A schematic diagram of an input XY space and an output UV space provided by an embodiment of the present invention.

[0040] Figure 3 A schematic diagram of the principle of a linear mapping controller provided by an embodiment of the present invention.

[0041] Figure 4 A schematic diagram of the principle of a preferred embodiment of a temperature and humidity linear control method for environmental testing equipment provided by one embodiment of the present invention.

[0042] Figure 5 A schematic structural diagram of a temperature and humidity linear control device for environmental testing equipment provided by another embodiment of the present invention. DETAILED DESCRIPTION

[0043] The drawings are for illustrative purposes only and should not be construed as limiting the present patent;

[0044] It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0045] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0046] Reference Figure 1 , is a flow chart of a temperature and humidity linear control method of an environmental test equipment provided by an embodiment of the present invention, comprising the following steps:

[0047] S1: Performing a temperature and humidity control test on the environmental test equipment, and calculating a temperature and humidity mapping matrix according to the results of the temperature and humidity control test;

[0048] S2: Calculating the heating amount and the humidification amount by a preset mapping formula according to the preset target temperature and the preset target humidity; wherein the preset mapping formula includes the temperature and humidity mapping matrix;

[0049] S3: Controlling the temperature and humidity of the environmental testing equipment according to the heating amount and the humidification amount.

[0050] For step S1, specifically, the temperature and humidity control test of the environmental test equipment specifically includes:

[0051] According to the preset first heating amount, the preset first humidification amount and the preset second heating amount, the preset second humidification amount, the environmental test equipment is controlled twice in temperature and humidity;

[0052] After the internal temperature and humidity of the environmental test equipment reach a stable equilibrium state, the internal temperature and internal humidity of the environmental test equipment after two temperature and humidity controls are recorded respectively, and the first test temperature and first test humidity and the second test temperature and second test humidity are obtained correspondingly.

[0053] In a preferred embodiment, the specific steps of the temperature and humidity control test are as follows:

[0054] (1) The main control center sends the preset first heating amount U1 to the preset heater, and simultaneously sends the first humidification amount V1 to the preset humidifier;

[0055] (2) The heater is preset to heat the working space of the environmental test equipment according to the value of U1, and the humidifier is preset to humidify the working space according to the value of V1;

[0056] (3) Wait for a sufficient period of time t to wait for the temperature and humidity in the working space to reach a stable equilibrium state; t is about 15 minutes to 30 minutes. Different test chambers have different t values. t is related to the shape and size of the test chamber, the insulation material of the chamber, the roughness of the inner wall surface, etc. These factors may affect the heat transfer rate and the water vapor condensation rate, thereby affecting the time to reach a stable equilibrium state;

[0057] (4) The main control center reads and records the first test temperature X1 and the first test humidity Y1 of the working space;

[0058] (5) The main control center sends the preset second heating amount U2 to the preset heater, and simultaneously sends the preset second humidification amount V2 to the preset humidifier;

[0059] (6) The heater is preset to heat the working space according to the value of U2, and the humidifier is preset to humidify the working space according to the value of V2;

[0060] (7) Continue for a period of time t, waiting for the temperature and humidity in the working space to reach a stable equilibrium state;

[0061] (8) The main control center reads and records the second test temperature X2 and the second test humidity Y2 of the working space.

[0062] Preferably, the recording of the internal temperature and internal humidity of the environmental test equipment after two temperature and humidity controls specifically includes:

[0063] After the internal temperature and humidity of the environmental testing equipment reach a stable equilibrium state, the internal temperature is recorded by a preset temperature sensor, and the internal humidity is recorded by a preset humidity sensor; wherein the preset temperature sensor and the preset humidity sensor are both arranged inside the environmental testing equipment.

[0064] In a preferred embodiment, the preset temperature sensor can be a thermocouple sensor, a thermistor sensor (such as Pt100), or a dry-bulb sensor (dry-wet-bulb method), and the preset humidity sensor can be a capacitive humidity sensor, a resistive humidity sensor, or a wet-bulb sensor (dry-wet-bulb method).

[0065] For step S1, further, the temperature and humidity mapping matrix is ​​calculated according to the results of the temperature and humidity control test, specifically including:

[0066] Assume that the preset first heating amount and the preset first humidification amount are U1 and V1 respectively, the preset second heating amount and the preset second humidification amount are U2 and V2 respectively, the first test temperature and the first test humidity are X1 and Y1 respectively, the second test temperature and the second test humidity are X2 and Y2 respectively, and the temperature and humidity mapping matrix is Then the mapping relationship is:

[0067]

[0068] According to the mapping relationship, we can get:

[0069]

[0070] The calculation results of a, b, c, and d are respectively substituted to obtain the temperature and humidity mapping matrix.

[0071] In a preferred embodiment, referring to Figure 2 , is a schematic diagram of an input XY space and an output UV space provided by an embodiment of the present invention. Figure 2 It can be seen that, assuming that two points D1(X1, Y1) and D2(X2, Y2) in the XY space are known, they correspond to two points D1′(U1, V1) and D2′(U2, V2) in the UV space respectively. Let the transformation matrix from the XY space to the UV space (that is, the mapping matrix) be:

[0072]

[0073] Then we have:

[0074]

[0075]

[0076] From formula (1), we can get: a·X1+b·Y1=U1…………(3)

[0077] c·X1+d·Y1=V1……… (4)

[0078] From formula (2), we can get: a·X2+b·Y2=U2…………(5)

[0079] c·X2+d·Y2=V2……… (6)

[0080] According to equations (3) to (6), the following solution can be obtained:

[0081] a=(Y2·U1-Y1·U2) / (X1·Y2-X2·Y1)… … … (7)

[0082] b=(X1·U2-X2·U1) / (X1·Y2-X2·Y1)… … … (8)

[0083] c=(Y2·V1-Y1·V2) / (X1·Y2-X2·Y1)… … … (9)

[0084] d=(X1·V2-X2·V1) / (X1·Y2-X2·Y1)… … … (10)

[0085] The following is an example of an actual mapping matrix learning process:

[0086] 1. The main control center sends U1=40.5 to the preset heater and V1=22.5 to the preset humidifier;

[0087] 2. The heater is preset to heat the working space according to the value of U1 of 40.5, and the humidifier is preset to humidify the working space according to the value of V1 of 22.5;

[0088] 3. Continue for a period of time t, where t is 25;

[0089] 4. The main control center reads and records the measured values ​​of the temperature and humidity sensors, and measures X1 = 15.0, Y1 = 30.0;

[0090] 5. The main control center sends U2=75.0 to the preset heater and V2=30.0 to the preset humidifier;

[0091] 6. The heater is preset to heat the working space according to the value of U2 75.0, and the humidifier is preset to humidify the working space according to the value of V2 30.0;

[0092] 7. Continue for a period of time t, where t is 25;

[0093] 8. The main control center reads and records the measured values ​​of the temperature and humidity sensors, and measures X2 = 30.0, Y2 = 37.5;

[0094] 9. Substituting equation (7) into equation (10), we obtain: a = 2.17, b = 0.267, c = 0.167, d = 0.667.

[0095] Thus, the specific temperature and humidity mapping matrix can be obtained.

[0096] For step S2, specifically, the heating amount and the humidification amount are calculated by a preset mapping formula according to the preset target temperature and the preset target humidity, specifically including:

[0097] Assuming that the preset target temperature is X and the preset target humidity is Y, the preset mapping formula is specifically:

[0098]

[0099] Wherein, U is the heating amount, and V is the humidification amount.

[0100] In a preferred embodiment, referring to Figure 3 , is a schematic diagram of the principle of a linear mapping controller provided by an embodiment of the present invention. Figure 3 It can be seen that for any input D(X, Y) of the linear mapping controller, the output D′(U, V) of the linear mapping controller can be calculated using the following formula:

[0101]

[0102] It can be seen from formula (11) that if the working space of the test chamber is expected to be stable at the target temperature X and the target relative humidity Y (i.e., point D(X, Y) in the XY space), then formula (11) can be used to calculate and determine the corresponding point D′(U, V) in the UV space, that is, the amount of heating U and humidification V that the outside world needs to provide to the working space of the test chamber.

[0103] Take an actual temperature and humidity control process as an example:

[0104] 1. Set the target temperature X = 13.5, the target humidity Y = 27.0, and use formula (11) to calculate the heating amount U and the humidification amount V, as follows:

[0105]

[0106] 2. The main control center sends the heating amount U=36.5 to the preset heater and the humidification amount V=20.3 to the preset humidifier;

[0107] 3. The preset heater heats the workspace at a U value of 36.5, and the preset humidifier humidifies the workspace at a V value of 20.3, so that the final temperature of the workspace is 13.5 and the humidity is 27.0.

[0108] For step S3, specifically, controlling the temperature and humidity of the environmental test equipment according to the heating amount and the humidification amount specifically includes:

[0109] The heating amount is sent to the preset heater through the preset main control center, and the humidification amount is sent to the preset humidifier, so that the preset heater heats the environmental test equipment according to the heating amount, and the preset humidifier humidifies the environmental test equipment according to the humidification amount.

[0110] Preferably, the preset main control center is specifically TEMI 990, the preset heater is specifically a hot air heater, and the preset humidifier is specifically an electric heating evaporative humidifier.

[0111] In a preferred embodiment, referring to Figure 4 , is a schematic diagram of a preferred embodiment of a temperature and humidity linear control method for environmental testing equipment provided by an embodiment of the present invention. Figure 4 It can be seen that a temperature sensor and a humidity sensor are set in the working space of the environmental test chamber, and the main control center can read the temperature and relative humidity of the working space of the environmental test chamber at any time. The main control center can send a heating control signal to the heater and a humidification control signal to the humidifier as needed, and the heater heats the working space and the humidifier humidifies the working space.

[0112] Reference Figure 5 , is a schematic diagram of the structure of a temperature and humidity linear control device for environmental testing equipment provided by another embodiment of the present invention, comprising: a parameter calculation module 101, a control amount calculation module 102 and a control module 103;

[0113] The parameter calculation module 101 is used to perform a temperature and humidity control test on the environmental test equipment, and calculate a temperature and humidity mapping matrix according to the result of the temperature and humidity control test;

[0114] The control amount calculation module 102 is used to calculate the heating amount and the humidification amount according to the preset target temperature and the preset target humidity through a preset mapping formula; wherein the preset mapping formula includes the temperature and humidity mapping matrix;

[0115] The control module 103 is used to control the temperature and humidity of the environmental testing equipment according to the heating amount and the humidification amount.

[0116] Furthermore, the parameter calculation module 101 is used to perform a temperature and humidity control test on the environmental test equipment, specifically including:

[0117] The environmental test equipment is subjected to temperature and humidity control twice, and after the internal temperature and humidity of the environmental test equipment reach a stable equilibrium state, the internal temperature and internal humidity of the environmental test equipment after the two temperature and humidity controls are recorded respectively, and the first test temperature, the first test humidity and the second test temperature, the second test humidity are obtained correspondingly.

[0118] Furthermore, the control module 103 is used to control the temperature and humidity of the environmental test equipment according to the heating amount and the humidification amount, specifically including:

[0119] The heating amount is sent to the preset heater through the preset main control center, and the humidification amount is sent to the preset humidifier, so that the preset heater heats the environmental test equipment according to the heating amount, and the preset humidifier humidifies the environmental test equipment according to the humidification amount.

[0120] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A temperature and humidity linear control method for environmental testing equipment, characterized in that: The steps include: Performing a temperature and humidity control test on the environmental test equipment, and calculating a temperature and humidity mapping matrix according to the results of the temperature and humidity control test; According to the preset target temperature and the preset target humidity, the heating amount and the humidification amount are calculated by a preset mapping formula; wherein the preset mapping formula includes the temperature and humidity mapping matrix; The temperature and humidity of the environmental testing equipment are controlled according to the heating amount and the humidification amount.

2. The temperature and humidity linear control method of environmental testing equipment according to claim 1, characterized in that: The temperature and humidity control test of the environmental test equipment specifically includes: According to the preset first heating amount, the preset first humidification amount and the preset second heating amount, the preset second humidification amount, the environmental test equipment is controlled twice in temperature and humidity; After the internal temperature and humidity of the environmental test equipment reach a stable equilibrium state, the internal temperature and internal humidity of the environmental test equipment after two temperature and humidity controls are recorded respectively, and the first test temperature and first test humidity and the second test temperature and second test humidity are obtained correspondingly.

3. The temperature and humidity linear control method of environmental testing equipment according to claim 2, characterized in that: The recording of the internal temperature and internal humidity of the environmental test equipment after two temperature and humidity controls specifically includes: After the internal temperature and humidity of the environmental testing equipment reach a stable equilibrium state, the internal temperature is recorded by a preset temperature sensor, and the internal humidity is recorded by a preset humidity sensor; wherein the preset temperature sensor and the preset humidity sensor are both arranged inside the environmental testing equipment.

4. The temperature and humidity linear control method of environmental testing equipment according to claim 2, characterized in that: The temperature and humidity mapping matrix is ​​calculated according to the results of the temperature and humidity control test, specifically comprising: Assume that the preset first heating amount and the preset first humidification amount are U1 and V1 respectively, the preset second heating amount and the preset second humidification amount are U2 and V2 respectively, the first test temperature and the first test humidity are X1 and Y1 respectively, the second test temperature and the second test humidity are X2 and Y2 respectively, and the temperature and humidity mapping matrix is Then the mapping relationship is: According to the mapping relationship, we can get: The calculation results of a, b, c, and d are respectively substituted to obtain the temperature and humidity mapping matrix.

5. The temperature and humidity linear control method of environmental testing equipment according to claim 4, characterized in that: The heating amount and the humidification amount are calculated by a preset mapping formula according to the preset target temperature and the preset target humidity, specifically including: Assuming that the preset target temperature is X and the preset target humidity is Y, the preset mapping formula is specifically: Wherein, U is the heating amount, and V is the humidification amount.

6. The temperature and humidity linear control method of environmental testing equipment according to claim 1, characterized in that: The controlling of the temperature and humidity of the environmental testing equipment according to the heating amount and the humidification amount specifically includes: The heating amount is sent to the preset heater through the preset main control center, and the humidification amount is sent to the preset humidifier, so that the preset heater heats the environmental test equipment according to the heating amount, and the preset humidifier humidifies the environmental test equipment according to the humidification amount.

7. The temperature and humidity linear control method of environmental testing equipment according to claim 6, characterized in that: The preset main control center is specifically TEMI 990, the preset heater is specifically a hot air heater, and the preset humidifier is specifically an electric heating evaporative humidifier.

8. A temperature and humidity linear control device for environmental testing equipment, characterized in that: include: Parameter calculation module, control quantity calculation module and control module; The parameter calculation module is used to perform a temperature and humidity control test on the environmental test equipment, and calculate a temperature and humidity mapping matrix according to the results of the temperature and humidity control test; The control amount calculation module is used to calculate the heating amount and the humidification amount according to the preset target temperature and the preset target humidity through a preset mapping formula; wherein the preset mapping formula includes the temperature and humidity mapping matrix; The control module is used to control the temperature and humidity of the environmental testing equipment according to the heating amount and the humidification amount.

9. The temperature and humidity linear control device for environmental testing equipment according to claim 8, characterized in that: The parameter calculation module is used to perform temperature and humidity control tests on environmental test equipment, specifically including: The environmental test equipment is subjected to temperature and humidity control twice, and after the internal temperature and humidity of the environmental test equipment reach a stable equilibrium state, the internal temperature and internal humidity of the environmental test equipment after the two temperature and humidity controls are recorded respectively, and the first test temperature, the first test humidity and the second test temperature, the second test humidity are obtained correspondingly.

10. The temperature and humidity linear control device for environmental testing equipment according to claim 8, characterized in that: The control module is used to control the temperature and humidity of the environmental test equipment according to the heating amount and the humidification amount, and specifically includes: The heating amount is sent to the preset heater through the preset main control center, and the humidification amount is sent to the preset humidifier, so that the preset heater heats the environmental test equipment according to the heating amount, and the preset humidifier humidifies the environmental test equipment according to the humidification amount.

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