CN116578136A - Environmental test box temperature control method for high-temperature aging test - Google Patents

Environmental test box temperature control method for high-temperature aging test Download PDF

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Publication number
CN116578136A
CN116578136A CN202310782426.6A CN202310782426A CN116578136A CN 116578136 A CN116578136 A CN 116578136A CN 202310782426 A CN202310782426 A CN 202310782426A CN 116578136 A CN116578136 A CN 116578136A
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temperature
heater
opening
output value
box
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黄河
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Wuhan Soliware Storage Technology Co ltd
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Wuhan Soliware Storage Technology Co ltd
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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • 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

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)

Abstract

The invention discloses a temperature control method of an environmental test box for a high-temperature aging test, which comprises the following steps: placing the tested device into an environment test box; closing an air door baffle, simultaneously opening an internal circulation fan and a heater, controlling the output of the heater through an incremental PID algorithm, and detecting that the heater reaches a minimum output value when the temperature in the box reaches a steady state; opening the throttle opening of the throttle baffle, and simultaneously continuously controlling the output of the heater to ensure that the temperature in the box reaches a steady state again, and adjusting the throttle opening to ensure that the output value of the heater is kept within a preset value range; the tested device is electrified to run, the output of the heater is controlled to be continuously reduced, the temperature in the box reaches a steady state again, the opening of the air door is regulated, and the output value of the heater is kept within a preset value range. The invention can effectively prevent the temperature in the box from exceeding the limit, automatically and accurately control the temperature in the box to be at the test target value, ensure the device to be tested under the constant target temperature environment, and ensure the accuracy and consistency of the test result.

Description

Environmental test box temperature control method for high-temperature aging test
Technical Field
The invention belongs to the technical field of high-temperature environment aging tests, and particularly relates to an environment test box temperature control method for a high-temperature aging test.
Background
Along with the continuous development of the front-end technology industries such as optical communication technology, 5G communication technology and the like, the importance of electronic components such as chips, optical modules and the like widely applied to the industries is increasingly highlighted, so that a testing link capable of controlling the quality of products of the electronic components is particularly important.
The reliability test is to detect the power-on running state and performance index of the electronic component in a high-temperature environment, rapidly evaluate the service life and reliability of the electronic component by accelerating the aging process of the electronic component, and screen out defective products in the electronic component. During testing, a high-temperature environment test box is used for providing constant high-temperature conditions required by a test for a tested device. In actual test, the tested device continuously generates heat after being electrified and operated, heat is accumulated, the temperature is continuously increased, the temperature condition of the test box cannot be kept constant, and finally the test condition is seriously deviated and fails.
In order to avoid continuous temperature rise in the high-temperature box and influence aging, an air outlet is generally arranged on the box body, an air door is arranged at the air outlet, when the temperature rise exceeds the test target temperature, the air door is manually opened, heat accumulated in the box is discharged, cold air outside the box is sucked, and the temperature in the box is reduced. When the temperature in the box falls below the target temperature, the damper is manually closed. The test chamber is maintained near the target temperature value by repeatedly opening and closing the damper. However, the mode completely depends on manual operation, the temperature fluctuation range is large, accurate temperature control is difficult, and overtemperature is easily caused by improper manual operation.
Patent CN109613413B provides a method and a system for increasing the number of samples tested in a high-temperature environmental aging test, the system is provided with a damper control mechanism, and according to the difference value Δt between the current temperature Treal and the target temperature Taim of the environmental test chamber and the current opening angle α of the damper, the opening state of the damper is automatically controlled by the damper control mechanism, so that the current temperature Treal in the environmental test chamber is accurately controlled within the range of taim±σ, and the constant temperature control of the environmental test chamber is realized.
But this approach has drawbacks: (1) The adjusting range can only be within the temperature tolerance range, the target temperature Taim can not be accurately controlled, once the temperature exceeds the tolerance range, the control can not be realized, the alarm can be realized, and the actual test is only used as a safety means; (2) In practical tests, when the adjustment difference is 0.1 ℃, the air door can be adjusted back and forth in one step, and the temperature in the box can be over-limited instead.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide an environmental test box temperature control method for a high-temperature aging test, which can effectively prevent the temperature in the box from exceeding the limit, automatically and accurately control the temperature in the box to be at a test target value, ensure the test of a device to be tested under a constant target temperature environment and ensure the accuracy and consistency of test results.
In order to achieve the above purpose, the invention provides a temperature control method of an environmental test chamber for a high-temperature aging test, wherein an air door baffle is arranged at an air outlet of the environmental test chamber, a heater and an internal circulating fan are arranged on an inner side wall of the environmental test chamber, and the control method comprises the following steps:
(1) Determining a target temperature according to the test requirement, and placing the tested device into an environment test box;
(2) Closing the damper baffle, and simultaneously opening the internal circulation fan and the heater, and controlling the output of the heater through an incremental PID algorithm to continuously raise the temperature in the box; when the temperature in the box reaches and stabilizes at the target temperature, detecting that the heater reaches the minimum output value at the moment;
(3) Opening the air door baffle, uniformly opening the air door opening of the air door baffle, and simultaneously continuously controlling the output of the heater through an incremental PID algorithm to ensure that the temperature in the box reaches and stabilizes at the target temperature again; detecting and according to the output value P of the heater at the moment 1 Regulating the opening of the air door, and when the temperature in the box reaches and stabilizes at the target temperature again, keeping the opening of the air door at the moment when the output value of the heater is in a preset value range;
(4) The tested device is electrified to run, and meanwhile, the output of the heater is controlled to be continuously reduced through an incremental PID algorithm, so that the temperature in the box reaches and stabilizes at the target temperature again; detecting and according to the output value P of the heater at the moment 2 And adjusting the opening of the air door, and when the temperature in the box reaches and stabilizes at the target temperature again, keeping the opening of the air door at the moment when the output value of the heater is within the preset value range, so as to realize the constant temperature control of the environment test box.
According to the environmental test box temperature control method for the high-temperature aging test, the current temperature value in the box is monitored in real time, the damper baffle is timely opened by monitoring the output value or the temperature change rate of the heater, the opening of the damper baffle is automatically calculated, the temperature fluctuation can be controlled in a short time, the temperature in the box is stabilized at a target value, the temperature overrun overshoot is effectively avoided, the device is tested at the target temperature, and the accuracy and consistency of the test result are ensured; simultaneously, can also in time reduce the air door aperture, make the heater maintain at suitable output scope, avoid the long-time high-power work of heater, effectively reduce the energy waste.
In one embodiment, in step (3), the output value P of the heater is detected and used 1 And adjusting the opening of the air door, and when the temperature in the box reaches and stabilizes at the target temperature again, keeping the opening of the air door at the moment when the output value of the heater is in a preset value range, wherein the method specifically comprises the following steps of:
at this time, the output value P of the heater 1 When the opening of the throttle valve is in the preset value range, the opening of the throttle valve is kept;
at this time, the output value P of the heater 1 When the temperature in the box reaches the target temperature again and is stabilized at the target temperature, and the output value of the heater is in the preset value range, the opening of the air door at the moment is kept;
at this time, the output value P of the heater 1 When the temperature in the box reaches the target temperature again and is stabilized at the target temperature, and the output value of the heater is in the preset value range, the opening of the air door at the moment is kept.
In one embodiment, in step (4), the output value P of the heater is detected and used as a function of the detected output value P 2 And adjusting the opening of the air door, and when the temperature in the box reaches and stabilizes at the target temperature again, keeping the opening of the air door at the moment when the output value of the heater is in a preset value range, wherein the method specifically comprises the following steps of:
at this time, the output value P of the heater 2 When the opening of the throttle valve is in the preset value range, the opening of the throttle valve is kept;
at this time, the output value P of the heater 2 When the temperature is smaller than the preset value range, the opening of the air door is uniformly opened until the temperature in the box is reachedAnd when the temperature reaches and stabilizes at the target temperature again and the output value of the heater is within the preset value range, the opening degree of the air door at the moment is kept.
In one embodiment, before the step of re-reaching and stabilizing the temperature in the tank to the target temperature in the step (4), the method further includes:
and detecting the temperature rising speed delta T in the box, and opening the throttle in proportion to the delta T when the delta T reaches a preset value delta Taim.
In one embodiment, in step (4), the output value P of the heater is detected and used as a function of the detected output value P 2 And adjusting the opening of the air door, and when the temperature in the box reaches and stabilizes at the target temperature again, keeping the opening of the air door at the moment when the output value of the heater is in a preset value range, wherein the method specifically comprises the following steps of:
at this time, the output value P of the heater 2 When the opening of the throttle valve is in the preset value range, the opening of the throttle valve is kept;
at this time, the output value P of the heater 2 And when the temperature in the box reaches the target temperature again and is stabilized at the target temperature, and the output value of the heater is in the preset value range, the opening of the air door at the moment is kept.
In one embodiment, the preset value range is 5% -10% of the normal output value of the heater.
In one embodiment, the controller is used to drive the stepper motor to rotate the damper flap to adjust the damper opening of the damper flap.
In one embodiment, the controller is coupled to the heater for controlling heater output via an incremental PID algorithm, and also for detecting heater output.
In one embodiment, a temperature sensor is used to detect the temperature within the environmental chamber; the temperature sensor is connected with the controller, and the controller is also used for calculating the rate delta T of temperature rise in the box according to the temperature in the box detected by the temperature sensor.
In one embodiment, the controller is a single-chip microcomputer control chip.
Drawings
FIG. 1 is a schematic view of an environmental test chamber according to an embodiment of the present invention;
FIG. 2 is a flow chart of an environmental test chamber temperature control method for high temperature burn-in testing according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The invention provides an environmental test box temperature control method for a high-temperature aging test, which is realized based on an environmental test box temperature control system, can effectively prevent the temperature in the box from exceeding the limit, automatically and accurately control the temperature in the box to be at a test target value, ensure the test of a device to be tested under a constant target temperature environment, and ensure the accuracy and consistency of test results.
As shown in FIG. 1, the environmental test chamber provided by the invention comprises a chamber body, wherein an air inlet and an air outlet are correspondingly formed in the opposite side walls of the chamber body, and an air door baffle is arranged at the air outlet. The environmental test chamber temperature control system provided by the invention can comprise a heater, an internal circulation fan, an electric actuating mechanism, a temperature sensor and a control system.
The electric actuating mechanism is connected with the air door baffle through a rotating shaft, and controls the discharge amount of high-temperature air by driving the air door baffle to rotate to adjust the opening of the air outlet. The internal circulation fan is used for driving internal gas to circularly flow in the box, so that the temperature in the box is uniform. The temperature sensor is arranged on an inner side wall of the box body and used for detecting the current temperature in the box in real time. The control system is respectively and electrically connected with the electric executing mechanism, the heater, the internal circulation fan and the temperature sensor, and is used for acquiring the current temperature fed back by the temperature sensor in real time, adjusting the output of the heater through an incremental PID algorithm, monitoring the output of the heater in real time and controlling the opening of the air door. Specifically, the control system provided in this embodiment may be a controller commonly used in the art, such as a single-chip microcomputer or DSP; the electric actuating mechanism can adopt a stepping motor; the in-tank temperature sensor may take a form commonly used in the art.
The temperature control method provided by the invention is realized based on the structure realized by the temperature control system of the environmental test chamber, and comprises the following steps S10 to S40, as shown in FIG. 2, in detail:
s10, determining a target temperature Taim according to the test requirement, and placing the tested device into an environment test box.
S20, closing the air door baffle, simultaneously opening the internal circulation fan and the heater, and controlling the output of the heater through a conventional incremental PID algorithm to continuously increase the temperature Treal in the tank. After a period of time, the temperature Treal in the tank reaches and stabilizes at the target temperature Taim, and the output value P of the heater reaches the minimum Pmin at this time is detected.
In step S20, the temperature in the control box is raised and stabilized at the target temperature value Taim by the incremental PID temperature control mode. When the heat balance is achieved in the box, the heating power of the heater is equal to the heat dissipation power of the box, the heat dissipation power of the box is small in general, the heating power of the heater is small at the moment, the output value P of the heater reaches the minimum Pmin, and the output value P is generally 1-2% of the normal output value Pe.
S30, opening the air door baffle, uniformly opening the air door opening of the air door baffle, controlling the output of the heater by the system through an incremental PID algorithm, and regulating the temperature Treal in the box to reach and stabilize at the target temperature Taim again; and detecting the output value P of the heater at the moment, adjusting the opening alpha of the air door, and when the temperature in the box reaches and stabilizes at the target temperature again, keeping the output value P of the heater within the range of a preset value Psv (5% -10% of the normal output value Pe), and keeping the opening alpha of the air door at the moment.
In step S30, the damper baffle is opened, the damper opening α is opened uniformly, heat in the box body is rapidly discharged through the air outlet, the temperature Trea in the box body is reduced, and the system continuously controls the output of the heater through the incremental PID algorithm, so that the temperature Treal in the box body reaches and stabilizes at the target temperature Taim again. Detecting the output value P of the heater at the moment, and adjusting the opening alpha of the air door: when P epsilon Psv, keeping the opening alpha of the air door; when P is more than Psv, uniformly reducing the opening alpha of the air door, and enabling the temperature in the box to reach and stabilize at the target temperature Taim again, P epsilon Psv, and keeping the opening alpha of the air door at the moment; when P < Psv, the throttle opening alpha is uniformly opened, and the temperature in the box reaches and stabilizes at the target temperature Taim again, P epsilon Psv is kept at the throttle opening alpha.
In step S20, after the heat balance is achieved in the tank, if a heat generating source occurs, the system will control to reduce the heater output through the incremental PID algorithm, and maintain the heat balance. However, the output value P of the heater reaches the minimum Pmin, the reducible range is small, and finally, the output value P can only be reduced to 0. After that, the heat generation amount of the heat generation source in the tank is continuously increased, the heat balance is quickly broken, the heat generation amount of the heat generation source is larger than the heat dissipation amount of the tank body, and the temperature in the tank is continuously increased Gao Chaowen. Furthermore, when the output value p=0 of the heater, the heater is in a runaway state, which is very unfavorable for controlling the temperature of the system.
Therefore, in step S20, when the output value P of the heater reaches the minimum Pmin, the heat balance achieved in the tank is very unstable, and is very liable to exceed Wen Guochong due to external factors. Therefore, in step S30, when the output value P of the heater wire reaches the minimum Pmin, the heat dissipating capacity is increased by opening the damper, so as to increase the output value P of the heater in steady state, expand the range in which the output value P of the heater can be reduced, and cope with the occurrence of the heat generating source.
Examples are as follows:
setting: target temperature taim=100 ℃, heat radiation power pb=5w of the tank, normal heater output pe=500w, preset value psv=pe of the heater (5% -10%) = (25W-50W).
In step S20, when the steady state is reached, p=pmin=pb=5w, and the heater is reduced by Δp= (5W to 0).
In step S30, when the steady state is reached, the heating power of the heater=the heat radiation power of the case+the heat radiation power of the damper, the range in which the heater can be reduced is enlarged, and Δp= (25W to 0).
Setting: when the damper opening α=30°, the damper heat dissipation power pd=50w, p=pb+pd=5w+50w=55w > (25W to 50W).
Namely: p > Psv
Then, the damper opening degree is reduced by 5 °, α=25°, the damper heat radiation power pd=30w, p=pb+pd=5w+30w=35w e (25W to 50W).
Namely: p epsilon Psv
Then, the throttle opening is maintained at this time by 25 °.
At this time, if a heat source is present, the heating power ph=10w, and to maintain the heat balance, the heater output value P is reduced by 10W, ph+ (P-10W) =pb+pd, that is: 10w+ (35W-10W) =35w.
If the heat source stops generating heat, ph=0, to maintain the heat balance, the heater output value P is increased by 10W, ph+ (p+10w) =pb+pd is: 0+ (25w+10w) =35w.
The temperature in the box can be stably controlled at the target temperature all the time, and overshoot can not be exceeded.
S40, electrifying the tested device to run, and controlling the heater to continuously reduce the output by the system through an incremental PID algorithm to enable the temperature in the box to reach and stabilize at the target temperature again; and detecting the output value P of the heater at the moment, and adjusting the opening alpha of the air door, so that when the temperature in the box reaches and stabilizes at the target temperature again, the output value P of the heater is in the range of a preset value Psv, and the opening of the air door at the moment is kept, so that the constant temperature control of the environment test box is realized.
In step S40, the device under test is powered on to run and generate heat, the in-tank temperature Treal increases, the output of the heater is reduced by the system through incremental PID control, the in-tank heat balance is maintained, and the in-tank temperature Treal is stabilized at the target temperature Taim.
In this process:
if the output value P of the heater is always within the preset value Psv, namely P epsilon Psv, the opening alpha of the air door is kept unchanged; if the output value P of the heater is reduced below the preset value Psv range, namely P is smaller than Psv, the throttle opening alpha is opened, heat is discharged, and when the internal temperature Treal is stabilized at the target temperature Taim, P epsilon Psv is kept, and the throttle opening alpha at the moment is kept.
Examples are as follows:
setting: target temperature taim=100 ℃, heat dissipation power pb=5w of the tank, normal heater output pe=500w, preset value psv=pe of the heater (5% -10%) = (25W-50W), damper opening α=25°, heat dissipation power pd=30w of the damper, and total heat dissipation power pt=pb+pd=35w.
At steady state, total heating power=total heat dissipation power, and then the heater output p=pt=35w.
When the tested device is electrified to run and heat, the heating power is set to be Ph.
When the heating power ph=10w of the device under test, ph+p=35w, p=25w, that is, P e Psv, holds the throttle opening α at this time.
When the heating power ph=20w of the device under test, ph+p=35w, p=15w, i.e., P < Psv, opening the damper by 5 °, α=30°, damper heat dissipation power pd=50w, total heat dissipation power pt=55w, and the in-tank temperature Treal decreases. The system adjusts the output increase of the heater through incremental PID control, the rise of the temperature Treal in the tank is stabilized at the target Taim, at the moment, ph+P=55W, P=35W, namely P epsilon Psv, and the opening alpha of the air door at the moment is kept.
Preferably, step S40 provided in this embodiment may further be:
when the tested device is electrified to run and generate heat, the output of the heater is continuously reduced by the system through the incremental PID control, the rising speed delta T of the temperature Treal in the box is detected, and when the delta T reaches a preset value delta Taim, the opening alpha of the air door is opened in proportion to the delta T.
When the temperature Treal in the tank reaches and stabilizes at the target temperature Taim again, detecting the output value P of the heater, and when P epsilon Psv, keeping the opening alpha of the air door; when P > Psv, the throttle opening alpha is uniformly reduced, so that the temperature in the box reaches and stabilizes at the target temperature Taim again, P epsilon Psv is kept at the throttle opening alpha at the moment.
In the embodiment, when the tested device is electrified to run and generate heat, the heating value is continuously increased, the temperature Treal in the box is increased, and the output of the heater is continuously reduced by the system through incremental PID control. When the rate Δt at which the in-tank temperature Treal rises increases sharply, this means that the amount of heat generated by the device under test increases sharply, and the rate at which the heater output decreases does not follow the rate at which the amount of heat generated by the device under test increases. At the next moment, the temperature Treal in the tank exceeds Wen Guochong, and at this time, the throttle opening alpha is opened to discharge heat.
Examples are as follows:
setting: when the inside temperature Treal stabilizes at the target temperature taim=100℃, the heat radiation power pb=5w of the case, the damper opening α=25°, the heat radiation power pd=30w of the damper, the total heat radiation power pt=pb+pd=35w, and the heater output p=35w.
Setting: the rated heating power ph=40w of the device under test, and the heating power of the device under test is gradually increased to the rated heating power along with the energizing operation.
At time T, the heating power Ph (T) =10w of the device under test, the heater output value decreases by Δp (T) =5w, the total heating power-total heat dissipation power=5w, and the in-tank temperature Treal increases by Δt=0.1 °.
At time t+1, the heating power Ph (t+1) =20w of the device under test, the heater output value decreases by Δp (t+1) =8w, the total heating power-total heat dissipation power=7w, and the in-box temperature Treal increases by Δt=0.2 °.
At time t+2, the heating power Ph (t+2) =40w of the device under test, the heater output value decreases by Δp (t+2) =10w, the total heating power-total heat dissipation power=17w, and the in-box temperature Treal increases by Δt=0.5 °.
The rate of decrease in heater output value Δ= (Δp (t+2) - Δp (t+1))/(Δp (t+1) - Δp (t))=2/3, and the rate of increase in measured device heat generation power Δ '= (Ph (t+2) -Ph (t+1))/(Ph (t+1) -Ph (t))=2, Δ' > Δ, it is expected that at the next time, the in-tank temperature Treal will rise rapidly.
At the moment, the air door angle alpha is opened in proportion to delta T, heat is discharged, the temperature Treal in the box rises and slowly drops, the output of the heater is increased by the incremental PID control of the system, and the temperature Treal in the box reaches and stabilizes at the target temperature Taim again; detecting the output value P of the heater at the moment: when P epsilon Psv, keeping the opening alpha of the air door and keeping the temperature constant; when P > Psv, gradually reducing the throttle opening alpha to enable the temperature in the box to reach and stabilize at the target temperature Taim, keeping the throttle opening alpha at the moment and keeping the temperature constant.
And finally, closing the environment test box after the test is completed.
According to the environmental test box temperature control method for the high-temperature aging test, the current temperature value in the box is monitored in real time, the damper baffle is timely opened by monitoring the output value or the temperature change rate of the heater, the opening of the damper baffle is automatically calculated, the temperature fluctuation can be controlled in a short time, the temperature in the box is stabilized at a target value, the temperature overrun overshoot is effectively avoided, the device is tested at the target temperature, and the accuracy and consistency of the test result are ensured; simultaneously, can also in time reduce the air door aperture, make the heater maintain at suitable output scope, avoid the long-time high-power work of heater, effectively reduce the energy waste.
It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the invention and is not intended to limit the invention, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.

Claims (10)

1. The environmental test box temperature control method for the high-temperature aging test is characterized in that an air door baffle is arranged at an air outlet of the environmental test box, a heater and an internal circulating fan are arranged on the inner side wall of the environmental test box, and the control method comprises the following steps:
(1) Determining a target temperature according to the test requirement, and placing the tested device into an environment test box;
(2) Closing the damper baffle, and simultaneously opening the internal circulation fan and the heater, and controlling the output of the heater through an incremental PID algorithm to continuously raise the temperature in the box; when the temperature in the box reaches and stabilizes at the target temperature, detecting that the heater reaches the minimum output value at the moment;
(3) Opening the air door baffle, uniformly opening the air door opening of the air door baffle, and simultaneously continuously controlling the output of the heater through an incremental PID algorithm to ensure that the temperature in the box reaches and stabilizes at the target temperature again; detecting and according to the output value P of the heater at the moment 1 Throttle valveOpening, when the temperature in the box reaches the target temperature again and is stabilized, the output value of the heater is in a preset value range, and the opening of the air door at the moment is kept;
(4) The tested device is electrified to run, and meanwhile, the output of the heater is controlled to be continuously reduced through an incremental PID algorithm, so that the temperature in the box reaches and stabilizes at the target temperature again; detecting and according to the output value P of the heater at the moment 2 And adjusting the opening of the air door, and when the temperature in the box reaches and stabilizes at the target temperature again, keeping the opening of the air door at the moment when the output value of the heater is within the preset value range, so as to realize the constant temperature control of the environment test box.
2. The environmental test chamber temperature control method for high temperature aging test according to claim 1, wherein in step (3), the output value P of the heater is detected and used as the output value P of the heater 1 And adjusting the opening of the air door, and when the temperature in the box reaches and stabilizes at the target temperature again, keeping the opening of the air door at the moment when the output value of the heater is in a preset value range, wherein the method specifically comprises the following steps of:
at this time, the output value P of the heater 1 When the opening of the throttle valve is in the preset value range, the opening of the throttle valve is kept;
at this time, the output value P of the heater 1 When the temperature in the box reaches the target temperature again and is stabilized at the target temperature, and the output value of the heater is in the preset value range, the opening of the air door at the moment is kept;
at this time, the output value P of the heater 1 When the temperature in the box reaches the target temperature again and is stabilized at the target temperature, and the output value of the heater is in the preset value range, the opening of the air door at the moment is kept.
3. The environmental test chamber temperature control method for high temperature aging test according to claim 1, wherein in step (4), the output value P of the heater is detected and used as the output value P of the heater 2 The opening of the air door is regulated to make the temperature in the boxWhen the temperature reaches and stabilizes at the target temperature again, the output value of the heater is in the preset value range, and the opening degree of the air door at the moment is kept, specifically comprising the following steps:
at this time, the output value P of the heater 2 When the opening of the throttle valve is in the preset value range, the opening of the throttle valve is kept;
at this time, the output value P of the heater 2 When the temperature in the box reaches the target temperature again and is stabilized at the target temperature, and the output value of the heater is in the preset value range, the opening of the air door at the moment is kept.
4. The environmental test chamber temperature control method for high temperature aging test according to claim 1, wherein in step (4), before the step of re-reaching and stabilizing the chamber temperature again at the target temperature, further comprising:
and detecting the temperature rising speed delta T in the box, and opening the throttle in proportion to the delta T when the delta T reaches a preset value delta Taim.
5. The method according to claim 4, wherein in the step (4), the output value P of the heater is detected and used as the output value P 2 And adjusting the opening of the air door, and when the temperature in the box reaches and stabilizes at the target temperature again, keeping the opening of the air door at the moment when the output value of the heater is in a preset value range, wherein the method specifically comprises the following steps of:
at this time, the output value P of the heater 2 When the opening of the throttle valve is in the preset value range, the opening of the throttle valve is kept;
at this time, the output value P of the heater 2 And when the temperature in the box reaches the target temperature again and is stabilized at the target temperature, and the output value of the heater is in the preset value range, the opening of the air door at the moment is kept.
6. The environmental test chamber temperature control method for a high temperature aging test according to claim 1, wherein the preset value range is 5% to 10% of the normal output value of the heater.
7. The environmental test chamber temperature control method for high temperature aging test according to claim 1, wherein the throttle opening of the throttle flap is adjusted by driving the stepping motor to rotate the throttle flap with the controller.
8. The environmental chamber temperature control method for a high temperature aging test according to claim 7, wherein the controller is connected to the heater for controlling the heater output by an incremental PID algorithm, and for detecting the heater output.
9. The environmental test chamber temperature control method for high temperature aging test according to claim 7, wherein a temperature sensor is employed to detect the chamber temperature of the environmental test chamber; the temperature sensor is connected with the controller, and the controller is also used for calculating the rate delta T of temperature rise in the box according to the temperature in the box detected by the temperature sensor.
10. The environmental test chamber temperature control method for the high-temperature aging test of claim 9, wherein the controller adopts a single-chip microcomputer control chip.
CN202310782426.6A 2023-06-28 2023-06-28 Environmental test box temperature control method for high-temperature aging test Pending CN116578136A (en)

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Application Number Priority Date Filing Date Title
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