CN116225101A - Temperature control method and device for environment test box and environment test box - Google Patents
Temperature control method and device for environment test box and environment test box Download PDFInfo
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- CN116225101A CN116225101A CN202310351821.9A CN202310351821A CN116225101A CN 116225101 A CN116225101 A CN 116225101A CN 202310351821 A CN202310351821 A CN 202310351821A CN 116225101 A CN116225101 A CN 116225101A
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- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
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- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
Abstract
The embodiment of the invention discloses a temperature control method and device of an environmental test box and the environmental test box. The temperature control method comprises the following steps: acquiring initial temperature, target temperature, preset temperature change rate and real-time temperature in the environmental test chamber; determining the PID output opening amount of the linear pulse valve and the PID output opening amount of the nonlinear pulse valve in the environment test box according to the initial temperature, the target temperature, the preset temperature change rate and the real-time temperature in the box; and controlling the working states of the linear pulse valve and the nonlinear pulse valve according to the PID output opening amount of the linear pulse valve and the PID output opening amount of the nonlinear pulse valve so as to control the temperature of the environmental test chamber. The temperature control method and device for the environmental test box and the environmental test box provided by the embodiment of the invention can realize nonlinear temperature change control and temperature change time controllability.
Description
Technical Field
The embodiment of the invention relates to an environment test equipment technology, in particular to a temperature control method and device of an environment test box and the environment test box.
Background
In various fields of production and life, for products with test temperature requirements, performance such as material stress change, material property change and the like in a certain temperature range needs to be tested, and the test products can be tested by an environment test box, so that the requirements on temperature control of the environment test box are also provided.
At present, in the existing temperature control method of the environmental test chamber, the linear cooling time is controllable, for example, the temperature is linearly cooled from 20 ℃ to-20 ℃ at a speed of 5 ℃/min, and the cooling time is 8min. However, when nonlinear cooling is performed, the temperature is generally lowered according to the maximum capacity of the equipment, and the cooling time is uncontrollable.
Disclosure of Invention
The embodiment of the invention provides a temperature control method and device of an environmental test box and the environmental test box, so as to realize nonlinear temperature change control and temperature change time controllability.
In a first aspect, an embodiment of the present invention provides a method for controlling a temperature of an environmental test chamber, including:
acquiring initial temperature, target temperature, preset temperature change rate and real-time temperature in the environmental test chamber;
determining the PID output opening amount of the linear pulse valve and the PID output opening amount of the nonlinear pulse valve in the environment test box according to the initial temperature, the target temperature, the preset temperature change rate and the real-time temperature in the box;
and controlling the working states of the linear pulse valve and the nonlinear pulse valve according to the PID output opening amount of the linear pulse valve and the PID output opening amount of the nonlinear pulse valve so as to control the temperature of the environmental test chamber.
Optionally, determining the PID output opening amount of the linear pulse valve and the PID output opening amount of the nonlinear pulse valve in the environmental test chamber according to the initial temperature, the target temperature, the preset temperature change rate and the real-time temperature in the chamber includes:
determining PID output opening amount uL of the linear pulse valve in the environment test box according to the initial temperature, the target temperature and the preset temperature change rate;
wherein e (T) =t t -T SV ，T t For the linear cooling calculation value at the moment T, T sv For the target temperature, k 1 、k 2 、k 3 Respectively a proportional coefficient, an integral coefficient and a differential coefficient, k 1 、k 2 、k 3 Are all related to the initial temperature and the preset temperature change rate;
determining the environment according to the initial temperature, the target temperature, the preset temperature change rate and the real-time temperature in the boxPID output opening amount u of nonlinear pulse valve in test box NL ；u NL ＝u NL1 +u NL2 ，
u NL1 For nonlinear correction of PID output, u NL2 Correcting PID output for nonlinear deviation, wherein DeltaT (T) is nonlinear deviation, deltaT 1 (T) is nonlinear correction deviation, k 1 ′、k 2 ′、k 3 ' respectively nonlinear correction of the proportional, integral and differential coefficients, k 1 ″、k 2 ″、k 3 "correct the proportional coefficient, the integral coefficient, and the differential coefficient for the nonlinear deviation, respectively.
Alternatively, k 1 ＝f 1 (T 0 ,V,e(t))，k 2 ＝f 2 (T 0 ,V,e(t))，k 3 ＝f 3 (T 0 ,V,e(t))，k 1 '＝f 1 '(ΔT,V t )，k 2 '＝f 2 '(ΔT,V t )，k 3 '＝f 3 '(ΔT,V t )，k 1 ”＝f 1 ”(ΔT1,V t )，k 2 ”＝f 2 ”(ΔT1,V t )，k 3 ”＝f 3 ”(ΔT1,V t ) Wherein T is 0 For the initial temperature, V is the preset temperature change rate, V t The actual rate of nonlinear cooling at time t.
Optionally, controlling the working states of the linear pulse valve and the nonlinear pulse valve according to the PID output opening amount of the linear pulse valve and the PID output opening amount of the nonlinear pulse valve includes:
if u L >0，u NL >=0, the linear pulse valve and the nonlinear pulse valve are controlled to output the opening amounts u with respective corresponding PIDs, respectively L And u NL Working;
if u L >0，u NL <0, the nonlinear pulse valve is controlled to be turned off, and the linear pulse valve outputs an opening amount of u by PID L +u NL Work is performed.
Optionally, controlling the temperature of the environmental test chamber includes:
and when the temperature of the environmental test chamber exceeds a preset temperature range, a prompt is sent out.
Optionally, the linear pulse valve and the nonlinear pulse valve are at least one.
In a second aspect, an embodiment of the present invention provides a temperature control apparatus for an environmental test chamber, including:
the data acquisition module is used for acquiring the initial temperature, the target temperature, the preset temperature change rate and the real-time temperature in the environment test box;
the opening determining module is used for determining the PID output opening amount of the linear pulse valve and the PID output opening amount of the nonlinear pulse valve in the environment test box according to the initial temperature, the target temperature, the preset temperature change rate and the real-time temperature in the box;
and the temperature control module is used for controlling the working states of the linear pulse valve and the nonlinear pulse valve according to the PID output opening amount of the linear pulse valve and the PID output opening amount of the nonlinear pulse valve so as to control the temperature of the environmental test chamber.
Optionally, the opening determining module includes:
the first opening determining unit is used for determining the PID output opening amount u of the linear pulse valve in the environment test chamber according to the initial temperature, the target temperature and the preset temperature change rate L ；
Wherein e (T) =t t -T SV ，T t For the linear cooling calculation value at the moment T, T sv For the target temperature, k 1 、k 2 、k 3 Respectively a proportional coefficient, an integral coefficient and a differential coefficient, k 1 、k 2 、k 3 Are all related to the initial temperature and the preset temperature change rate;
a second opening determining unit for determining PID output opening u of the nonlinear pulse valve in the environmental test chamber according to the initial temperature, the target temperature, the preset temperature change rate and the real-time temperature in the chamber NL ；u NL ＝u NL1 +u NL2 Wherein, the method comprises the steps of, wherein,
u NL1 for nonlinear correction of PID output, u NL2 Correcting PID output for nonlinear deviation, wherein DeltaT (T) is nonlinear deviation, deltaT 1 (T) is nonlinear correction deviation, k 1 ′、k 2 ′、k 3 ' respectively nonlinear correction of the proportional, integral and differential coefficients, k 1 ″、k 2 ″、k 3 "correct the proportional coefficient, the integral coefficient, and the differential coefficient for the nonlinear deviation, respectively.
In a third aspect, an embodiment of the present invention provides an environmental test chamber, including a control system and a refrigeration system, where the control system and the refrigeration system are disposed in the environmental test chamber, the control system includes a controller and a temperature sensor, the refrigeration system includes a linear pulse valve and a nonlinear pulse valve, and the linear pulse valve, the nonlinear pulse valve and the temperature sensor are all electrically connected to the controller, where the temperature control device according to the second aspect is integrated in the controller.
Optionally, the refrigeration system further comprises a compressor, a condenser, an evaporator and a throttling device, wherein the compressor is communicated with the condenser, the condenser is communicated with the evaporator through the throttling device, and the evaporator is communicated with the compressor.
According to the temperature control method and device for the environmental test box and the environmental test box, provided by the embodiment of the invention, the initial temperature, the target temperature, the preset temperature change rate and the real-time temperature in the box of the environmental test box are obtained; determining the PID output opening amount of the linear pulse valve and the PID output opening amount of the nonlinear pulse valve in the environment test box according to the initial temperature, the target temperature, the preset temperature change rate and the real-time temperature in the box; and controlling the working states of the linear pulse valve and the nonlinear pulse valve according to the PID output opening amount of the linear pulse valve and the PID output opening amount of the nonlinear pulse valve so as to control the temperature of the environmental test chamber. According to the temperature control method and device for the environment test box and the environment test box, the working states of the linear pulse valve and the nonlinear pulse valve are controlled according to the determined PID output opening amount of the linear pulse valve and the determined PID output opening amount of the nonlinear pulse valve, for example, the linear pulse valve and the nonlinear pulse valve are controlled to work, the corresponding PID output opening amounts are the respective PID output opening amounts, and the controllability of nonlinear temperature change control and temperature change time is realized.
Drawings
FIG. 1 is a flow chart of a method for controlling the temperature of an environmental test chamber according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a temperature variation curve according to a first embodiment of the present invention;
FIG. 3 is a flow chart of a method for controlling the temperature of an environmental test chamber according to a second embodiment of the present invention;
FIG. 4 is a block diagram of a temperature control device for an environmental test chamber according to a third embodiment of the present invention;
fig. 5 is a partial block diagram of an environmental test chamber according to a third embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
Example 1
Fig. 1 is a flowchart of a temperature control method for an environmental test chamber according to an embodiment of the present invention, where the method may be applied to temperature control of an environmental test chamber, and the method may be performed by a temperature control device of the environmental test chamber, where the device may be implemented in software and/or hardware, and where the device may be integrated into a controller in a control system of the environmental test chamber, and the method specifically includes the following steps:
The temperature sensor is electrically connected with the temperature control device to acquire the initial temperature of the environmental test box and the real-time temperature in the box, and the target temperature and the preset temperature change rate can be externally input to the temperature control device.
And 120, determining the PID output opening amount of the linear pulse valve and the PID output opening amount of the nonlinear pulse valve in the environmental test chamber according to the initial temperature, the target temperature, the preset temperature change rate and the real-time temperature in the chamber.
Fig. 2 is a schematic diagram illustrating a temperature change curve according to a first embodiment of the present invention. Referring to fig. 2, taking cooling as an example, the temperature of the environmental test chamber is reduced from the initial temperature to the target temperature, the cooling mode includes linear cooling and nonlinear cooling, and the corresponding temperature change curve includes a linear theoretical curve, a nonlinear theoretical curve and a nonlinear actual curve. The PID output opening amount of the linear pulse valve and the PID output opening amount of the nonlinear pulse valve are functions of the initial temperature, the target temperature and the preset temperature change rate.
And 130, controlling the working states of the linear pulse valve and the nonlinear pulse valve according to the PID output opening amount of the linear pulse valve and the PID output opening amount of the nonlinear pulse valve so as to control the temperature of the environmental test chamber.
Exemplary, if the output opening amount u of the linear pulse valve L And the output opening amount u of the nonlinear pulse valve NL If the PID output opening amount is larger than zero, the linear pulse valve and the nonlinear pulse valve are controlled to work, and the corresponding PID output opening amount is the PID output opening amount; if PID output opening amount u of linear pulse valve L PID output opening amount u of nonlinear pulse valve greater than zero NL If the output opening amount is smaller than zero, the nonlinear pulse valve is controlled to be turned off, and the linear pulse valve is controlled to output the opening amount as u L +u NL The work of the system realizes nonlinear temperature change control and temperature change time controllability.
According to the temperature control method for the environmental test chamber, the initial temperature, the target temperature, the preset temperature change rate and the real-time temperature in the environmental test chamber are obtained; determining the PID output opening amount of the linear pulse valve and the PID output opening amount of the nonlinear pulse valve in the environment test box according to the initial temperature, the target temperature, the preset temperature change rate and the real-time temperature in the box; and controlling the working states of the linear pulse valve and the nonlinear pulse valve according to the PID output opening amount of the linear pulse valve and the PID output opening amount of the nonlinear pulse valve so as to control the temperature of the environmental test chamber. According to the temperature control method of the environmental test chamber, the working states of the linear pulse valve and the nonlinear pulse valve are controlled according to the determined PID output opening amount of the linear pulse valve and the determined PID output opening amount of the nonlinear pulse valve, for example, the linear pulse valve and the nonlinear pulse valve are controlled to work, the corresponding PID output opening amount is the respective PID output opening amount, and the controllability of nonlinear temperature change control and temperature change time is realized.
Example two
Fig. 3 is a flowchart of a temperature control method for an environmental test chamber according to a second embodiment of the present invention, where the method may be applied to temperature control of an environmental test chamber, and the method may be performed by a temperature control device of the environmental test chamber, where the device may be implemented in software and/or hardware, and where the device may be integrated into a controller in a control system of the environmental test chamber, and the method specifically includes the following steps:
Wherein, the liquid crystal display device comprises a liquid crystal display device,
e(t)＝T t -T SV referring to FIG. 2, taking cooling as an example, T t For the linear cooling calculation value at the moment T, T sv At the target temperature，k 1 、k 2 、k 3 Respectively a proportional coefficient, an integral coefficient and a differential coefficient, k 1 、k 2 、k 3 Both with respect to the initial temperature and the predetermined rate of temperature change. k (k) 1 ＝f 1 (T 0 ,V,e(t))，k 2 ＝f 2 (T 0 ,V,e(t))，k 3 ＝f 3 (T 0 ,V,e(t))。k 1 、k 2 、k 3 The specific functional relation of (2) may be determined according to the actual temperature control requirement, and is not limited herein.
Wherein u is NL ＝u NL1 +u NL2 Wherein, the method comprises the steps of, wherein,
u NL1 for nonlinear correction of PID output, u NL2 Correcting PID output for nonlinear deviation, wherein DeltaT (T) is nonlinear deviation, deltaT 1 (T) is nonlinear correction deviation, k 1 ′、k 2 ′、k 3 ' respectively nonlinear correction of the proportional, integral and differential coefficients, k 1 ″、k 2 ″、k 3 "correct the proportional coefficient, the integral coefficient, and the differential coefficient for the nonlinear deviation, respectively. k (k) 1 '＝f 1 '(ΔT,V t )，k 2 '＝f 2 '(ΔT,V t )，k 3 '＝f 3 '(ΔT,V t )，k 1 ”＝f 1 ”(ΔT1,V t )，k 2 ”＝f 2 ”(ΔT1,V t )，k 3 ”＝f 3 ”(ΔT1,V t ) Wherein T is 0 For the initial temperature, V is the preset temperature change rate, V t The actual rate of nonlinear cooling at time t. k (k) 1 ′、k 2 ′、k 3 ′、k 1 ″、k 2 ″、k 3 The specific functional relationship of "may be determined based on actual temperature control requirements and is not limited herein.
The linear pulse valve and the nonlinear pulse valve in the environment test box are at least one. If u L >0，u NL >When the valve is=0, the linear pulse valve and the nonlinear pulse valve are required to work, and the corresponding PID output opening amounts are u L And u NL 。
Specifically, u NL <When 0, the nonlinear pulse valve needs to be controlled to be switched off, the linear pulse valve works, and the PID output opening amount of the linear pulse valve is controlled to be u L +u NL Nonlinear temperature change control is performed. In addition, when the temperature of the environmental test chamber exceeds a preset temperature range, a prompt is sent out, and measures are taken in time.
According to the temperature control method of the environmental test chamber, the working states of the linear pulse valve and the nonlinear pulse valve are controlled according to the determined PID output opening amount of the linear pulse valve and the determined PID output opening amount of the nonlinear pulse valve, for example, the linear pulse valve and the nonlinear pulse valve are controlled to work, the corresponding PID output opening amount is the respective PID output opening amount, and the controllability of nonlinear temperature change control and temperature change time is realized.
Example III
Fig. 4 is a block diagram of a temperature control device of an environmental test chamber according to a third embodiment of the present invention. The temperature control device includes: a data acquisition module 310, an opening determination module 320, and a temperature control module 330. The data acquisition module 310 is used for acquiring the initial temperature, the target temperature, the preset temperature change rate and the real-time temperature in the environmental test chamber; the opening determining module 320 is configured to determine a PID output opening amount of the linear pulse valve and a PID output opening amount of the nonlinear pulse valve in the environmental test chamber according to the initial temperature, the target temperature, the preset temperature change rate, and the real-time temperature in the chamber; the temperature control module 330 is used for controlling the working states of the linear pulse valve and the nonlinear pulse valve according to the PID output opening amount of the linear pulse valve and the PID output opening amount of the nonlinear pulse valve so as to control the temperature of the environmental test chamber.
Optionally, the opening determining module 320 includes: a first opening degree determination unit and a second opening degree determination unit; the first opening determining unit is used for determining PID output opening amount u of the linear pulse valve in the environment test chamber according to the initial temperature, the target temperature and the preset temperature change rate L ；
Wherein e (T) =t t -T SV ，T t For the linear cooling calculation value at the moment T, T sv For the target temperature, k 1 、k 2 、k 3 Respectively a proportional coefficient, an integral coefficient and a differential coefficient, k 1 、k 2 、k 3 Are all related to the initial temperature and the preset temperature change rate; the second opening determining unit is used for determining the PID output opening amount u of the nonlinear pulse valve in the environmental test chamber according to the initial temperature, the target temperature, the preset temperature change rate and the real-time temperature in the chamber NL ；u NL ＝u NL1 +u NL2 Wherein->
u NL1 For nonlinear correction of PID output, u NL2 Correcting PID output for nonlinear deviation, wherein DeltaT (T) is nonlinear deviation, deltaT 1 (T) is nonlinear correction deviation, k 1 ′、k 2 ′、k 3 ' respectively nonlinear correction of the proportional, integral and differential coefficients, k 1 ″、k 2 ″、k 3 "correct the proportional coefficient, integral coefficient and sum for nonlinear deviations, respectivelyDifferential coefficient.
In one embodiment, the temperature control module 330 includes a first control unit and a second control unit; wherein the first control unit is used for controlling if u L >0，u NL >=0, the linear pulse valve and the nonlinear pulse valve are controlled to output opening amounts u with respective corresponding PIDs, respectively L And u NL Working; the second control unit is used for if u L >0，u NL <0, controlling the nonlinear pulse valve to be switched off, wherein the linear pulse valve outputs an opening amount of u by a PID L +u NL Work is performed.
Optionally, the temperature control module 330 further includes: the prompting unit is used for sending out a prompt when the temperature of the environmental test chamber exceeds a preset temperature range.
Fig. 5 is a partial block diagram of an environmental test chamber according to a third embodiment of the present invention. Referring to fig. 5, the environmental test chamber includes a control system and a refrigerating system, the control system and the refrigerating system are disposed in the environmental test chamber, the control system includes a controller 10 and a temperature sensor 20, the refrigerating system includes a linear pulse valve 30 and a nonlinear pulse valve 40, and the linear pulse valve 30, the nonlinear pulse valve 40 and the temperature sensor 20 are all electrically connected to the controller 10, and the temperature control apparatus according to any embodiment of the present invention is integrated in the controller 10. The controller 10 can control the on-off state and the output opening degree of the linear pulse valve 30 and the nonlinear pulse valve 40 to realize the controllability of nonlinear temperature change control and temperature change time.
Optionally, the refrigeration system further comprises a compressor, a condenser, an evaporator and a throttling device, wherein the compressor is communicated with the condenser, the condenser is communicated with the evaporator through the throttling device, and the evaporator is communicated with the compressor. Specifically, the controller is electrically connected with the compressor, so that the working state of the compressor can be controlled, and the flow direction and the refrigeration process of the refrigerant among the compressor, the condenser and the evaporator can refer to the prior art, and the description is omitted herein.
The temperature control device of the environmental test chamber and the environmental test chamber provided by the embodiment belong to the same invention conception as the temperature control method of the environmental test chamber provided by any embodiment of the invention, have corresponding beneficial effects, and detailed technical details not shown in the embodiment are detailed in the temperature control method of the environmental test chamber provided by any embodiment of the invention.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, and that various obvious changes, rearrangements, combinations, and substitutions can be made by those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (10)
1. A method of controlling the temperature of an environmental test chamber, comprising:
acquiring initial temperature, target temperature, preset temperature change rate and real-time temperature in the environmental test chamber;
determining PID output opening amount of the linear pulse valve and PID output opening amount of the nonlinear pulse valve in the environment test box according to the initial temperature, the target temperature, the preset temperature change rate and the real-time temperature in the box;
and controlling the working states of the linear pulse valve and the nonlinear pulse valve according to the PID output opening amount of the linear pulse valve and the PID output opening amount of the nonlinear pulse valve so as to control the temperature of the environment test box.
2. The method according to claim 1, wherein determining the PID output opening amount of the linear pulse valve and the PID output opening amount of the nonlinear pulse valve in the environmental test chamber based on the initial temperature, the target temperature, the preset temperature change rate, and the in-chamber real-time temperature includes:
according to the initial temperature, the target temperature and the preset temperatureDetermining PID output opening amount u of linear pulse valve in environment test box L ；
Wherein e (T) =t t -T SV ，T t For the linear cooling calculation value at the moment T, T sv For the target temperature, k 1 、k 2 、k 3 Respectively a proportional coefficient, an integral coefficient and a differential coefficient, k 1 、k 2 、k 3 Are both related to the initial temperature and the preset temperature change rate;
determining PID output opening amount u of the nonlinear pulse valve in the environment test box according to the initial temperature, the target temperature, the preset temperature change rate and the real-time temperature in the box NL ；u NL ＝u NL1 +u NL2 ，
u NL1 For nonlinear correction of PID output, u NL2 Correcting PID output for nonlinear deviation, wherein DeltaT (T) is nonlinear deviation, deltaT 1 (T) is nonlinear correction deviation, k 1 ′、k 2 ′、k 3 ' respectively nonlinear correction of the proportional, integral and differential coefficients, k 1 ″、k 2 ″、k 3 "correct the proportional coefficient, the integral coefficient, and the differential coefficient for the nonlinear deviation, respectively.
3. The temperature control method according to claim 2, wherein k 1 ＝f 1 (T 0 ,V,e(t))，k 2 ＝f 2 (T 0 ,V,e(t))，k 3 ＝f 3 (T 0 ,V,e(t))，k 1 '＝f 1 '(ΔT,V t )，k 2 '＝f 2 '(ΔT,V t )，k 3 '＝f 3 '(ΔT,V t )，k 1 ”＝f 1 ”(ΔT1,V t )，k 2 ”＝f 2 ”(ΔT1,V t )，k 3 ”＝f 3 ”(ΔT1,V t ) Wherein T is 0 For the initial temperature, V is the preset temperature change rate, V t The actual rate of nonlinear cooling at time t.
4. The temperature control method according to claim 2, wherein the controlling the operating states of the linear pulse valve and the nonlinear pulse valve based on the PID output opening amount of the linear pulse valve and the PID output opening amount of the nonlinear pulse valve includes:
if u L >0，u NL >=0, the linear pulse valve and the nonlinear pulse valve are controlled to output opening amounts u with respective corresponding PIDs, respectively L And u NL Working;
if u L >0，u NL <0, controlling the nonlinear pulse valve to be switched off, wherein the linear pulse valve outputs an opening amount of u by a PID L +u NL Work is performed.
5. The method of claim 1, wherein said controlling the temperature of said environmental chamber comprises:
and when the temperature of the environmental test chamber exceeds a preset temperature range, a prompt is sent out.
6. The temperature control method according to claim 1, wherein the linear pulse valve and the nonlinear pulse valve are each at least one.
7. A temperature control device for an environmental test chamber, comprising:
the data acquisition module is used for acquiring the initial temperature, the target temperature, the preset temperature change rate and the real-time temperature in the environment test box;
the opening determining module is used for determining the PID output opening amount of the linear pulse valve and the PID output opening amount of the nonlinear pulse valve in the environment test box according to the initial temperature, the target temperature, the preset temperature change rate and the real-time temperature in the box;
and the temperature control module is used for controlling the working states of the linear pulse valve and the nonlinear pulse valve according to the PID output opening amount of the linear pulse valve and the PID output opening amount of the nonlinear pulse valve so as to control the temperature of the environment test box.
8. The temperature control device according to claim 7, wherein the opening degree determination module includes:
a first opening determining unit, configured to determine a PID output opening amount u of the linear pulse valve in the environmental test chamber according to the initial temperature, the target temperature, and the preset temperature change rate L ；
Wherein e (T) =t t -T SV ，T t For the linear cooling calculation value at the moment T, T sv For the target temperature, k 1 、k 2 、k 3 Respectively a proportional coefficient, an integral coefficient and a differential coefficient, k 1 、k 2 、k 3 Are both related to the initial temperature and the preset temperature change rate;
a second opening determining unit for determining PID output opening u of the nonlinear pulse valve in the environmental test chamber according to the initial temperature, the target temperature, the preset temperature change rate and the real-time temperature in the chamber NL ；u NL ＝u NL1 +u NL2 ，
u NL1 For nonlinear correction of PID output, u NL2 Correcting PID output for nonlinear deviation, wherein DeltaT (T) is nonlinear deviation, deltaT 1 (T) is nonlinear correction deviation, k 1 ′、k 2 ′、k 3 ' respectively nonlinear correction scaling factorIntegral and differential coefficients, k 1 ″、k 2 ″、k 3 "correct the proportional coefficient, the integral coefficient, and the differential coefficient for the nonlinear deviation, respectively.
9. An environmental test chamber, comprising a control system and a refrigeration system, wherein the control system and the refrigeration system are arranged in the environmental test chamber, the control system comprises a controller and a temperature sensor, the refrigeration system comprises a linear pulse valve and a nonlinear pulse valve, the linear pulse valve, the nonlinear pulse valve and the temperature sensor are electrically connected with the controller, and the temperature control device according to any one of claims 7-8 is integrated in the controller.
10. The test chamber of claim 9, wherein the refrigeration system further comprises a compressor, a condenser, an evaporator, and a throttling device, the compressor being in communication with the condenser, the condenser being in communication with the evaporator through the throttling device, the evaporator being in communication with the compressor.
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