Temperature control method, device and equipment for ink weather resistance test

Abstract

The invention relates to the technical field of ink weather resistance testing, and discloses a temperature control method, device and equipment for an ink weather resistance test, and the method comprises the steps: obtaining a current temperature value when cold and hot impact test equipment carries out the ink weather resistance test; the current temperature value is compared with a preset impact temperature, the temperature deviation value is obtained, and the preset impact temperature comprises a thermal impact temperature and a cold impact temperature; the method comprises the steps that a temperature deviation value between a current temperature value and a preset impact temperature is generated, a corresponding PID parameter adjusting signal is generated according to the temperature deviation value, PID control is carried out until the temperature reaches the preset impact temperature, then heat preservation is carried out, and a cyclic cold and hot alternate impact test is carried out. And generating a PID parameter adjustment signal and carrying out PID control so as to effectively and rapidly control the temperature based on a PID algorithm and improve the temperature conversion efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of ink weatherability testing, and in particular to a temperature control method, device and equipment for ink weatherability testing. Background Art

[0002] At present, when testing the weatherability of ink, a single cold test or a single hot test is usually used to simulate the ink storage environment. However, in the actual transportation, storage, and use of ink, it is often impossible to maintain a constant temperature. First, during transportation, such as in the summer, the temperature of the transport compartment or the container on the ship can reach 50 or 60 degrees. When it arrives at a storage warehouse with a lower temperature, it is relatively a state of rapid cooling and a large temperature difference between hot and cold. For example, the outdoor transportation temperature in the north is dozens of degrees below zero in winter, while in actual use, there is a heating temperature of about 20 degrees in the factory, and there is a sudden temperature rise process. Secondly, during storage, the warehouse environment of the manufacturer is different, and the temperature difference in various places is also relatively large. In addition, extreme climates have become more and more common this year. The sudden temperature changes make the ink easy to deteriorate during storage, and finally it often faces instantaneous high temperatures during use. In summary, single cold or single hot tests cannot fully and fully evaluate the storage stability of ink.

[0003] In order to examine the ink's ability to withstand climate change, it is necessary to frequently perform high and low temperature conversions to observe the effects of rapid temperature changes on the ink's color, viscosity and other properties under different temperature conditions. Slow temperature conversion speed or long temperature recovery time will greatly affect the accuracy of the test results and the efficiency of the experiment. Therefore, how to effectively improve the temperature conversion efficiency has become an urgent problem to be solved. Summary of the invention

[0004] In view of this, the present invention provides a temperature control method, device and equipment for ink weather resistance testing to solve the problem of how to effectively improve the temperature conversion efficiency.

[0005] In a first aspect, the present invention provides a temperature control method for ink weatherability test, which is applied to a temperature control system for ink tolerance test. The temperature control system for ink tolerance test includes a thermal shock test device, which is used to perform ink weatherability test. The method includes:

[0006] Get the current temperature value of the thermal shock test equipment when performing ink weather resistance test;

[0007] Compare the current temperature value with the preset shock temperature to obtain a temperature deviation, wherein the preset shock temperature includes a hot shock temperature and a cold shock temperature;

[0008] Generate the corresponding PID parameter adjustment signal according to the temperature deviation, and perform PID control until the temperature reaches the preset shock temperature, then keep warm and perform a cyclic hot and cold alternating shock test.

[0009] The present invention generates a PID parameter adjustment signal and performs PID control by performing a temperature deviation between a current temperature value of an ink weatherability test performed by a hot and cold shock test device and a preset shock temperature, so as to effectively and quickly control the temperature based on a PID algorithm and improve the temperature conversion efficiency.

[0010] In an optional implementation, generating a corresponding PID parameter adjustment signal according to the temperature deviation includes:

[0011] According to the temperature deviation and the proportional gain, a proportional term is calculated, and the proportional term is used to reflect the influence of the deviation between the current temperature value and the preset shock temperature;

[0012] The integral term is calculated based on the accumulated temperature deviation and the integral gain, and the integral term is used to reflect the influence of the small accumulated temperature deviation;

[0013] The differential term is calculated according to the change rate of the temperature deviation and the differential gain, and the differential term is used to reflect the influence of the change rate of the temperature deviation;

[0014] The PID parameter adjustment signal is determined based on the sum of the proportional term, the integral term, and the differential term.

[0015] The present invention generates a PID parameter adjustment signal by controlling the proportional term parameter, the integral term parameter and the differential term parameter, and effectively adjusts the three parameters to quickly control the temperature change and prevent the temperature from drastically oscillating and over-adjusting.

[0016] In an optional embodiment, the temperature control system of the ink tolerance test further includes a heating element and a cooling element, and performs PID control, including:

[0017] The PID parameter adjustment signal is sent to the heating element and the cooling element to drive the heating element to heat or the cooling element to cool.

[0018] The present invention controls the refrigeration element and the heating element so that the device temperature converges to the preset impact temperature, so as to apply the PID control logic to the test device, thereby ensuring that the test device reaches the preset impact temperature and is in an ideal working condition.

[0019] In an optional implementation, before calculating the integral term according to the accumulated temperature deviation and the integral gain, the method further includes:

[0020] Accumulated temperature deviation, judging whether the accumulated temperature deviation has changed;

[0021] If the temperature deviation changes, the integral time constant is calculated and the integral gain is set according to the integral time constant.

[0022] The present invention sets an integral time constant when the accumulated temperature deviation changes, so as to adjust the strength and speed of the integral action, thereby improving the response time and stability.

[0023] In an optional implementation, after calculating the integral term according to the accumulated temperature deviation and the integral gain, the method further includes:

[0024] Preset integral term limit;

[0025] If the integral term reaches the preset integral term limit, the accumulation of the integral term is stopped.

[0026] The present invention sets an integral term limit to stop accumulating the integral term when the integral term reaches a preset integral term limit, thereby preventing the integral term from being too large and avoiding overreaction when approaching a preset impact temperature, thereby avoiding the possibility of causing oscillation.

[0027] In an optional implementation, after calculating the differential term according to the rate of change of the temperature deviation and the differential gain, the method further includes:

[0028] Determine whether the differential correction value meets the preset rule, the preset rule being that the rate of change of the temperature deviation is less than the maximum rate of change;

[0029] If the differential term correction value meets the preset rule, the step of determining the PID parameter adjustment signal according to the addition result of the proportional term, the integral term and the differential term is performed;

[0030] If the derivative correction value does not meet the preset rules, the derivative effect is ignored.

[0031] The present invention determines whether the differential term correction value complies with a preset rule, and ignores the differential effect when it does not comply with the preset rule, so as to avoid unnecessary violent reactions caused by sudden temperature changes.

[0032] In a second aspect, the present invention provides a temperature control device for ink weatherability testing, the device comprising:

[0033] An acquisition module is used to obtain the current temperature value of the hot and cold shock test equipment when performing ink weather resistance test;

[0034] A comparison module, used for comparing the current temperature value with a preset shock temperature to obtain a temperature deviation, wherein the preset shock temperature includes a hot shock temperature and a cold shock temperature;

[0035] The control module is used to generate a corresponding PID parameter adjustment signal according to the temperature deviation, perform PID control, and keep the temperature until the temperature reaches the preset shock temperature, and then perform a cyclic hot and cold alternating shock test.

[0036] In a third aspect, the present invention provides a computer device, comprising: a memory and a processor, the memory and the processor are communicatively connected to each other, computer instructions are stored in the memory, and the processor executes the temperature control method for ink weather resistance testing of the above-mentioned first aspect or any corresponding embodiment thereof by executing the computer instructions.

[0037] In a fourth aspect, the present invention provides a computer-readable storage medium having computer instructions stored thereon, the computer instructions being used to enable a computer to execute the temperature control method for ink weatherability testing of the above-mentioned first aspect or any corresponding embodiment thereof.

[0038] In a fifth aspect, the present invention provides a computer program product, comprising computer instructions for causing a computer to execute the temperature control method for ink weatherability testing according to the first aspect or any corresponding embodiment thereof. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0040] Figure 1 is a flow chart of a temperature control method for ink weatherability testing according to an embodiment of the present invention;

[0041] Figure 2 Schematic diagram of an implementation method for ink weatherability test according to an embodiment of the present invention;

[0042] Figure 3 is a structural block diagram of a temperature control device for ink weatherability testing according to an embodiment of the present invention;

[0043] Figure 4 It is a schematic diagram of the hardware structure of a computer device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0045] According to an embodiment of the present invention, an embodiment of a temperature control method for ink weather resistance testing is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0046] In this embodiment, a temperature control method for ink weatherability test is provided, which is applied to a temperature control system for ink tolerance test. The temperature control system for ink tolerance test includes a hot and cold shock test device, which is used to perform ink weatherability test. Figure 1 is a flow chart of a temperature control method for ink weatherability testing according to an embodiment of the present invention. Figure 1 As shown, the process includes the following steps:

[0047] Step S101, obtaining the current temperature value of the thermal shock test equipment when performing the ink weather resistance test.

[0048] In the embodiment of the present invention, the hot and cold shock test equipment is a device that can provide rapid hot and cold test conditions. It is used in hot and cold tests of inks. It is an experimental device that can simulate extreme outdoor weather conditions. It can examine the ability of inks to withstand climate change and the impact of rapid changes between different temperature conditions on ink color, viscosity and other characteristics. It is suitable for performance evaluation of various inkjet printing, paint and ink products. The hot and cold shock test equipment is provided with a temperature sensor to feed back a temperature signal to collect the current temperature value when the hot and cold shock test equipment is conducting an ink tolerance test.

[0049] Specifically, the temperature sensor is set in the vicinity of the heater or cooler in the thermal shock test equipment to collect temperature values ​​in real time and detect the temperature values ​​in real time through a high-precision probe. Before performing the temperature control of the ink weather resistance test, a communication link with the temperature sensor is established to ensure that the connection status is normal.

[0050] Step S102, comparing the current temperature value with the preset impact temperature to obtain a temperature deviation.

[0051] In the embodiment of the present invention, the shock temperature is preset, specifically including the thermal shock temperature and the cold shock temperature. In the embodiment of the present invention, the thermal shock temperature is 35°C to 65°C, and the cold shock temperature is -35°C to -15°C (minus 35°C to minus 15°C) as an example. This is only an example and is not intended to be limiting. The current temperature value is compared with the preset shock temperature, and the deviation between the current temperature value and the preset shock temperature is calculated to obtain the temperature deviation.

[0052] Step S103, generating a corresponding PID parameter adjustment signal according to the temperature deviation, performing PID control, and then maintaining the temperature until the temperature reaches a preset shock temperature, and performing a cyclic hot and cold alternating shock test.

[0053] In an embodiment of the present invention, a PID algorithm is used to adjust the proportional term (P), integral term (I) and differential term (D) of the PID controller according to the temperature deviation to perform heating or cooling until the preset shock temperature is reached. For example, when the preset shock temperature is 50 degrees and the current ambient temperature is 48.9 degrees, the workload of the heater is calculated so that the set standard is finally achieved and maintained constant. When the temperature is positive, the heating is enhanced until the thermal shock temperature is reached. When the temperature is negative, the cooling is enhanced until the cold shock temperature is reached. After reaching the preset shock temperature, the insulation operation is performed, and then a cyclic hot and cold alternating shock test is performed, and the number of cycles is 5 to 10 times.

[0054] Continue to perform the corresponding heating or cooling action to let the temperature in the device converge to the target temperature. When the output adjusted by the PID controller according to the above regulation logic is applied to the actual device, the entire control system will closely track the new temperature changes and respond in time to ensure that the laboratory finally reaches the ideal working conditions to be achieved. Optionally, the ink can be put through a low temperature state during the test. At this time, if the temperature deviates from the target value by -10 degrees, the system will increase the cooling intensity to reduce the error between the two until the temperature is constant. Such a continuous and smooth process lays a good foundation for the consistency and accuracy of the experimental results.

[0055] Among them, the proportional term P parameter directly reflects the influence of the temperature deviation, the integral term I parameter reflects the influence of the cumulative temperature deviation, and the differential term D parameter reflects the influence of the rate of change of the temperature deviation. By adaptively adjusting the proportional term P parameter, the integral term I parameter and the differential term D parameter, it is ensured that the control system still responds correctly under different temperature conditions and reduces the temperature deviation.

[0056] It should be noted that after PID control is performed, an appropriate waiting time is given so that the system has time to respond to the adjustment signal. It is necessary to check again whether the actual temperature has achieved the expected change. If the inspection result is not ideal, the strategy needs to be readjusted until the actual temperature is regulated within the ideal temperature range. The process of collecting temperature and re-detecting temperature needs to be repeated until the measured ambient temperature remains within the ideal temperature range. The whole process is a feedback control cycle mechanism to continuously monitor and correct the temperature of the ink tolerance test equipment and ensure that the temperature is within the ideal temperature range to complete the reliability test.

[0057] After detecting the initial temperature of the environment, the rapid temperature adjustment function is then activated, that is, before implementing the temperature shock, the actual temperature level of the environment is first confirmed, and based on the actual temperature, the operating mode that can quickly change the ambient temperature is activated. If the ambient temperature is at room temperature at this time, and the subsequent link needs to test the ink's resistance to freezing cracking under extremely low temperature conditions, the refrigeration component is immediately used to lower the temperature.

[0058] The temperature control method for ink weather resistance testing provided in this embodiment generates a PID parameter adjustment signal and performs PID control by the temperature deviation between the current temperature value of the ink weather resistance test performed by the hot and cold shock test equipment and the preset shock temperature, so as to effectively and quickly control the temperature based on the PID algorithm and improve the temperature conversion efficiency.

[0059] In this embodiment, a temperature control method for ink weatherability testing is provided, and the process includes the following steps:

[0060] Step S201, obtaining the current temperature value of the thermal shock test equipment when performing the ink weather resistance test.

[0061] For details, please see Figure 1 Step S101 of the illustrated embodiment will not be described in detail here.

[0062] Step S202, comparing the current temperature value with the preset impact temperature to obtain a temperature deviation.

[0063] For details, please see Figure 1 Step S102 of the illustrated embodiment will not be described in detail here.

[0064] Step S203, generating a corresponding PID parameter adjustment signal according to the temperature deviation, performing PID control, and then maintaining the temperature until the temperature reaches the preset shock temperature, and performing a cyclic hot and cold alternating shock test.

[0065] Specifically, generating a corresponding PID parameter adjustment signal according to the temperature deviation in the above step S203 includes:

[0066] Step S2031, calculating the proportional term according to the temperature deviation and the proportional gain.

[0067] Step S2032, calculating the integral term according to the accumulated temperature deviation and the integral gain.

[0068] Step S2033, calculating the differential term according to the rate of change of the temperature deviation and the differential gain.

[0069] Step S2034, determining a PID parameter adjustment signal according to the sum of the proportional term, the integral term, and the differential term.

[0070] In an embodiment of the present invention, heating and cooling are performed based on a PID algorithm, and the proportional term (P), integral term (I), and differential term (D) parameters of the PID controller are adjusted according to the temperature deviation. The proportional term is used to reflect the influence of the deviation between the current temperature value and the preset impact temperature, the integral term is used to reflect the influence of a small cumulative temperature deviation, and the differential term is used to reflect the influence of the rate of change of the temperature deviation.

[0071] Calculate the proportional P term value. In the PID controller, the proportional P term value is defined as the immediate response coefficient of the deviation between the actual output and the desired set point. The temperature deviation between the current temperature value and the preset shock temperature is proportional to the proportional gain K. p Multiply.

[0072] The calculation formula is as follows:

[0073] P(t)=K p *e(t)

[0074] Among them, P(t) is the value of the proportional P term, K p is the proportional gain, which determines the speed of the response error, e(t) is the temperature deviation, e(t)=r(t)-y(t), y(t) is the current temperature value, and r(t) is the preset shock temperature.

[0075] Specifically, when simulating the weather resistance of ink in the laboratory, if the current temperature detection temperature shows that it is 2°C too low, that is, the temperature deviation is 2°C, the preset proportional gain K p Set to 1, the proportional P term value is 2. When e(t) = 2, K p If set to 1, the P value is 2.

[0076] Calculate the integral I value. The integral term accumulates all past temperature deviations and is used to eliminate steady-state errors. The integral of the accumulated temperature deviation is multiplied by the integral gain.

[0077] The calculation formula is as follows:

[0078] I(t)=K i *∫e(t)dt

[0079] Among them, I(t) is the value of the proportional I term, K i is the integral gain, which is used to control the effect of error accumulation.

[0080] Calculate the differential D value. The differential term reflects the rate of change of the temperature deviation and is used to predict future error trends, suppress overshoot and oscillation, and multiply the differential of the temperature deviation by the differential gain.

[0081] The calculation formula is as follows:

[0082]

[0083] Among them, D(t) is the differential D value, K d is the differential gain, which is used to control the dynamic response and reduce the influence of the error variable rate.

[0084] The calculation of the differential D term provides instantaneous feedback on the input change in the system response, that is, the relevant correction behavior of the rate of change of the deviation. It will not work when the target value is constant, but when a jump occurs, the differential D term can compensate accordingly according to the speed at which the system deviates from the ideal set value. Continuing with the example mentioned above, at the beginning of the test, the rapid fluctuation of the ambient temperature caused the sensor reading to be unstable. In this scenario, the PID will evaluate its transient response based on the jump change of the deviation and generate the corresponding compensation value accordingly.

[0085] The proportional term, integral term, and differential term are added together to form the PID parameter adjustment signal. The calculation formula is as follows:

[0086]

[0087] The PID parameter adjustment signal is determined by combining three different dimensions, namely the current temperature deviation, the accumulated temperature deviation in the past, and the rate of change of the temperature deviation. The heater in the laboratory will receive the exact control instructions obtained by combining the proportional, integral and differential calculations, and will perform precise adjustments based on this information to achieve the desired goal. Such a precise control system can ensure that the laboratory can always maintain standard conditions when conducting ink durability testing.

[0088] By controlling the proportional term parameters, integral term parameters, and differential term parameters to jointly generate the PID parameter adjustment signal, the three parameters are effectively adjusted to quickly control temperature changes while preventing violent temperature fluctuations and over-adjustment.

[0089] In some optional implementations, before calculating the integral term according to the accumulated temperature deviation and the integral gain, the method further includes:

[0090] Step Sa, accumulating the temperature deviation, and determining whether the accumulated temperature deviation changes.

[0091] Step Sb: If the temperature deviation changes, the integral time constant is calculated, and the integral gain is set according to the integral time constant.

[0092] In the embodiment of the present invention, the integral time constant Ti is an important parameter in the integral term, which determines the strength of the integral action. According to the accumulated temperature deviation, it is determined whether the temperature deviation has changed. If the temperature deviation is the same as before, the integral time constant is not increased. If the temperature deviation has changed, the division result of the temperature deviation and the integral time is determined as the integral time constant. When calculating the integral term, the integral gain is set according to the calculated integral time constant.

[0093] The temperature deviation is divided by the integration time, and the data obtained in this iteration is accumulated on top of the result accumulated in the previous stage. This means that as long as there is a temperature difference, the value will continue to accumulate until it is completely eliminated.

[0094] When the detection results show that the actual temperature is very close to the pre-defined target setting or has completely reached it, the integral term will be weakened or even completely eliminated to reduce the oscillation phenomenon caused by the controller being too sensitive. This mechanism is called windmill effect pause or the integral control action is curbed. Within the set target temperature range, the controller attempts to prevent the damage caused by drastic changes in repeated switching (these changes may be caused by temperature jumps up and down caused by too fast adjustment).

[0095] The larger the integral time constant, the slower the integral term changes and the weaker the integral action. On the contrary, the smaller the integral time constant, the faster the integral term changes and the stronger the integral action. The main function of the integral term is to eliminate steady-state errors and more accurately control the temperature to reach the preset impact curve when controlling the temperature. By adjusting the integral time constant, the speed and intensity of the integral action can be controlled, thereby effectively improving the stability of the response.

[0096] In the process of calculating the increase of the integral I value, if the deviation is the same as the previous one, it will not be increased. Otherwise, it will be accumulated to the cumulative error according to the formula deviation ÷ integral time Ti; the cumulative error value and the deviation jointly affect the action on the final actuator; once it is detected that the system is close to or reaches the preset target temperature, the integral windmill effect stops or is limited to prevent large oscillations of the control output; when the calculated output exceeds the preset range, protective measures are taken to limit the maximum and minimum outputs. Specific steps. First, for each calculation cycle, in the process of calculating the integral increase value, check whether the deviation between the real-time temperature and the preset target value has changed (the preset target here refers to the value that the control system wants to stabilize the temperature): if the deviation remains constant, the cumulative error value, that is, the accumulated past deviation integral value, will not be updated; but if the deviation changes, the new deviation value will be divided by the time constant Ti of the integral action (this step improves the speed of the controller response by reducing the cumulative error caused by long-term errors, because Ti represents the time scale for the control system to respond to changes), so that a new I contribution is generated and added to the cumulative error.

[0097] Cumulative error is the overall impact of all past deviations on the current system. This value is used together with the current actual deviation to adjust the operating intensity and mode of the heating or cooling equipment (i.e., adjust the operating frequency or energy intensity of the heating element or cooling device) so that the entire system moves towards a stable target temperature. Optionally, suppose a furnace is heating a certain material and the actual measured temperature is 1 degree lower than the target. If the temperature difference remains unchanged the next moment, the I term will not change (so the operation of the heating element will not be adjusted based on the integral effect). If the temperature difference becomes 2 degrees in the next second, this increment will be converted into an enhanced adjustment of the heating element according to the Ti constant, which will be reflected in this element, such as increasing the heating output to slow down the growth rate of the temperature deviation.

[0098] When the detection results show that the actual temperature is very close to the pre-defined target setting or has completely reached it, the integral term will be weakened or even completely eliminated to reduce the oscillation phenomenon caused by the controller being too sensitive. This mechanism is called windmill effect pause or the integral control action is curbed. Within the set target temperature range, the controller attempts to prevent the damage caused by drastic changes in repeated switching (these changes may be caused by temperature jumps up and down caused by too fast adjustment).

[0099] By setting the integral time constant when the accumulated temperature deviation changes, the strength and speed of the integral action can be adjusted to improve response time and stability.

[0100] Specifically, the above step S2032 includes:

[0101] Step S20321, pre-set the integral term limit.

[0102] Step S20322: If the integral term reaches a preset integral term limit, the accumulation of the integral term is stopped.

[0103] In the embodiment of the present invention, in the PID control, the function of the integral I term value is to eliminate the steady-state error, but it may also cause an overreaction when approaching the preset shock temperature, thereby causing oscillation. In order to avoid this situation, the integral term limit, that is, the maximum value and the minimum value are preset. When the integral term reaches the maximum value or the minimum value of the preset integral term, the accumulation of the integral term is stopped to effectively prevent the integral term from continuing to increase when the control output is saturated, resulting in large oscillations. Correcting the output can effectively reduce the overshoot phenomenon that may occur during the dynamic response process.

[0104] In addition to setting the maximum and minimum values ​​of the integral term, you can also set conditional integration, that is, when approaching the preset shock temperature, reduce the integral term gain or directly turn off the integral term, or start the integral term when the error is large and disable the integral term when the error is small.

[0105] By setting the integral term limit, when the integral term reaches the preset integral term limit, the integral term is stopped from being accumulated, so as to prevent the integral term from being too large, thereby avoiding over-reaction when approaching the preset shock temperature, thereby avoiding the possibility of causing oscillation.

[0106] Specifically, the temperature control system of the ink tolerance test further includes a heating element and a cooling element. The PID control in the above step S203 includes:

[0107] Step S2035, sending the PID parameter adjustment signal to the heating element and the cooling element to drive the heating element to heat or the cooling element to cool.

[0108] In the embodiment of the present invention, the heating and cooling control of the ink hot and cold shock test is realized by controlling the heating element and the cooling element based on the PID algorithm, and the PID parameter adjustment signal is used as the start control signal of the heating element and the cooling element to activate or weaken the power of the heating element or start the cooling element, and the heating rate and the cooling rate are adjusted through dynamic feedback to realize the function of quickly and accurately adjusting the environment in which the ink is located. Specifically, the output PID parameter adjustment signal can indicate the on-off time ratio of the heating wire, which is only an example here and is not intended to be limiting.

[0109] The temperature of the hot and cold alternating shock test can be controlled by PID. The test object can be first subjected to a cold shock to reach a preset cold shock temperature and then subjected to a heat preservation operation, and then subjected to a heat shock to reach a preset heat shock temperature and then subjected to a heat preservation operation. The cold preservation time and the heat preservation time are preset, for example, the cold preservation time is 0.5h to 3h, and the heat preservation time is 0.5h to 3h, or the test object can be subjected to a heat shock first and then a cold shock.

[0110] By controlling the cooling elements and heating elements, the equipment temperature converges to the preset shock temperature, so that the PID control logic is applied to the test equipment to ensure that the test equipment reaches the preset shock temperature and is in ideal working conditions.

[0111] like Figure 2 As shown, the rapid cooling and heating machine used in the embodiment of the present invention includes three boxes, one box for storing cold, one box for storing heat, and another box for placing samples. The program is set to control the cold air or hot air to enter the sample box, and then keep it warm.

[0112] A heating and cooling system consisting of a refrigeration element and a heating element is constructed, and the system uses PID control. PID, as a proportional integral differential control algorithm, is widely used in industrial automation control scenarios. The technology is used in the embodiment of the present invention mainly to ensure that the temperature of the heating furnace or refrigeration system is accurately adjusted to the cold shock temperature and the hot shock temperature during the heating and cooling stages, and to avoid fluctuations or hysteresis caused by unstable control as much as possible, so as to meet the requirements of placing the ink in an environment within a specific temperature range.

[0113] Specifically, the ink tolerance test can be carried out in a freezing environment below minus twenty degrees Celsius. The heating and cooling system can be started, and liquid nitrogen can be used as a medium to quickly freeze the ink in the sample box to the cold shock temperature. When the high temperature environment reaches more than fifty degrees Celsius, it can be heated to the thermal shock temperature for testing to achieve high and low temperature switching during the test.

[0114] The temperature control system of the ink tolerance test also includes a temperature control zone, which is synchronized with the heating element and the cooling element to improve the temperature conversion efficiency. The temperature control zone is a medium storage for preparing the ink to quickly cool down or heat up to complete the heat exchange, and provides a heat exchange medium so that the ink contacts the medium in different temperature zones to complete the heat exchange. The preparatory action refers to the preparation of a coolant or heating material that can exchange heat with the sample in advance inside the equipment, so as to facilitate immediate intervention when the temperature changes rapidly during the test, so as to ensure the smooth progress of the test, reduce the non-working time of the test equipment, and improve the efficiency of equipment use.

[0115] The temperature control area includes a cold storage box and a heat storage box, which means that the hot and cold shock test equipment has two different areas that work independently but are combined with each other as a whole. The cold storage box and the heat storage box can complete the cooling and heating tasks respectively. The temperature control area always maintains an extremely cold and rapid cooling state to ensure that when the sample box is subjected to hot and cold shocks, the gas phase environment around the ink is quickly adjusted to the thermal shock temperature or the cold shock temperature, and the conversion is completed in a short time without causing a significant change in the material state of the sample, so as to better simulate the extreme climate change caused by the rapid change of the outdoor natural temperature, such as when a vehicle passes through a tunnel and there is a huge temperature difference between the inside and outside of the tunnel.

[0116] The computer equipment software platform is set up as the center to dispatch and command the synergy between the cold storage box and the heat storage box to make it work efficiently. By controlling the gas flow of the cold storage box and the heat storage box, the conversion time is controlled within a few seconds or even lower. By accurately detecting and regulating the temperature of the sample box, the instability caused by excessive temperature gradient changes is effectively avoided, the temperature change rate is kept consistent and stable, and each experimental link is guaranteed to operate in a controllable and stable state, so as to improve the performance of the entire equipment and the accuracy of the test.

[0117] Partitions are provided between the cold storage box and the sample box, and between the heat storage box and the sample box. When the preset program is to cool first and then heat, the partition between the cold storage box and the sample box is opened first to allow cold air to enter the sample box and continue cooling. Then, rapid heating is performed, the partition of the cold storage box is closed, and the partition of the heat storage box is opened, so as to achieve the impact effect of sudden temperature rise and drop, so that the ink sample receives the dual effects of heat shock and cold shock, thereby simulating the performance of the degree of ink erosion and damage under different climate backgrounds.

[0118] In addition, the adjustment means for accurately measuring the amount and speed of the heat transfer liquid for replacement is set to determine the effect of sudden environmental changes, that is, a precision mechanical system is required to strictly quantitatively control the cooling oil or other heat dissipation carriers injected into the test space through the pipeline and contacted with the ink to absorb and release heat before being discharged from the laboratory. A stepper motor is used with a quantitative valve to execute the forward discharge and reverse filling commands according to the program signal, and the operation rhythm can be adjusted to make the filling amount constant and the discharge speed consistent each time, so as to ensure that the hot and cold alternation amplitude experienced by the tested ink is accurate and the reproducibility of repeated experiments is good.

[0119] By intelligently controlling the temperature to overcome the shortcomings of traditional single cold and single hot test methods, as well as common defects such as slow temperature conversion rate of ordinary hot and cold shock or inability to achieve high-frequency conversion, the working efficiency of hot and cold shock test equipment has been greatly improved, so that research and analysis of temperature-sensitive materials can be carried out, and various weather resistance evaluations can be completed with high quality, which will help R&D personnel to better verify the properties of inks, optimize the process design, and ensure that product quality reliability meets the standards to meet the application requirements of consumer markets in different climate regions.

[0120] In some optional implementations, after calculating the differential term according to the rate of change of the temperature deviation and the differential gain, the method further includes:

[0121] Step S2033a, determining whether the differential term correction value complies with a preset rule.

[0122] Step S2033b, if the differential term correction value meets the preset rule, then execute the step of determining the PID parameter adjustment signal according to the addition result of the proportional term, the integral term, and the differential term.

[0123] Step S2033c: if the differential term correction value does not meet the preset rule, the differential effect is ignored.

[0124] In the embodiment of the present invention, the preset rule is that the rate of change of the deviation is less than the maximum rate of change. In order to maintain the stability of the temperature, it is necessary to check whether the calculated differential D-term correction meets the preset rule. If the differential D-term correction value meets the above preset rule, it is directly added to the final PID parameter adjustment signal, that is, step S203 is executed. If the differential D-term correction value does not meet the above preset conditions, the differential effect is ignored, thereby avoiding unnecessary violent reactions caused by sudden temperature changes.

[0125] In order to maintain the stability of temperature control, it is necessary to check whether the calculated differential D correction meets the specific steps of the rule that the rate of change of the deviation is less than the maximum allowable rate of change. This part is the optimization of the temperature stability control logic in the control system. First, the rate of change of the deviation can be calculated based on the feedback signal of the system. The differential D term here is an important component in the PID controller, which is used to predict and reduce future errors in the control process. Therefore, it is necessary to confirm whether the differential term is running within the specified rate to maintain stability; then, by setting the standard for the maximum allowable rate of change, the obtained rate of change of the deviation is detected. Specifically, when calculating the rate of change of the deviation, the difference between the actual measured temperature of the system and the preset target temperature is usually differentiated.

[0126] If the correction value meets the above judgment conditions, the specific step of adding the value to the final control signal means that if the test results show that the rate of change of the deviation is lower than the maximum allowable range determined in advance, the system will allow the new correction value to be adopted. In this step, the new correction value will be superimposed with the existing sum and added to the overall control system signal as an integral part of the adjustment system work.

[0127] Otherwise, this differential effect will be ignored, thus avoiding unnecessary drastic reactions due to sudden temperature changes. This means that if the deviation rate exceeds the specified value, the system will not adopt the new correction factor D in this case. The purpose of this is to avoid unexpected drastic dynamic responses or control distortion problems that may be caused by sudden changes in environmental factors. This approach prevents the controller from being too sensitive to rapid or inconsistent changes, resulting in overly drastic operations.

[0128] The purpose of correcting the output to reduce the overshoot that may occur during the dynamic response of the system is to improve control performance and reduce the risk of system overreaction. When the system is affected by rapid temperature changes, it may cause the output to change too much, exceeding the level required for normal operation. This overshoot may damage the equipment or affect production quality. By managing the D correction, any over-adjustment in the system can be suppressed to keep the overall operation smoother. For example, when the equipment quickly enters the high temperature stage, improper adjustments will cause the ink test sample to overheat or even be damaged. This can be avoided through reasonable differential correction. This process ensures that the hot and cold shock test can be accurately carried out under controllable and stable conditions, making the test more reliable and consistent.

[0129] After a round of temperature change test process is completed, a waiting period is entered to give the sample enough time to adapt and stabilize at a new temperature state. When all the above processes are completed, the system software will pause the action and give a period of idleness. During this idle period, the test sample can dissipate the excess heat absorbed, or absorb the missing cold energy, and return to the conditions specified in the next round of tests. If it has just experienced low temperature invasion and is about to enter the drying process, the test material is allowed to slowly return to a suitable temperature point above zero before entering the baking room to ensure the accuracy and scientificity of the test. In this way, after several rounds of reciprocation, the ink product's tolerance to extreme climate environments can be fully evaluated.

[0130] In addition, it is necessary to monitor and record the temperature fluctuation and rate when the ink transitions from the hot zone to the cold zone or vice versa, to ensure that there is no retention phenomenon in the entire transformation path, and to meet the pre-established change rate standard value so that the experimental results are accurate, effective and without interference. For example, in a complete test cycle to verify the weather resistance of ink, when the object needs to be immediately transferred to the freezing stage after simulating sunlight, it should be ensured that the temperature of the object can complete the transition process within the limited time without causing damage or variation.

[0131] Once the monitoring finds that the equipment exceeds the safety threshold, the current operation will be stopped immediately, and the sound and light alarm will be activated to remind personnel to intervene in time to avoid accident risks. Assuming that the equipment has a built-in safety mechanism, if the temperature of the sensing temperature zone suddenly rises to the dangerous upper limit during a certain operation, it will automatically interrupt the current behavior to prevent overload damage and simultaneously warn the operator to avoid greater problems.

[0132] The temperature control method for ink weather resistance testing provided in this embodiment determines whether the differential correction value meets the preset rules, and ignores the differential effect if it does not meet the preset rules, so as to avoid unnecessary violent reactions caused by sudden temperature changes.

[0133] In this embodiment, a temperature control device for ink weatherability testing is also provided, which is used to implement the above-mentioned embodiments and preferred embodiments, and will not be repeated hereafter. As used below, the term "module" can be a combination of software and / or hardware that implements a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceivable.

[0134] This embodiment provides a temperature control device for ink weatherability testing. Figure 3 As shown, including:

[0135] The acquisition module 301 is used to obtain the current temperature value when the thermal shock test equipment performs the ink weather resistance test.

[0136] The comparison module 302 is used to compare the current temperature value with the preset shock temperature to obtain a temperature deviation, where the preset shock temperature includes a hot shock temperature and a cold shock temperature.

[0137] The control module 303 is used to generate a corresponding PID parameter adjustment signal according to the temperature deviation, perform PID control, and keep the temperature until the temperature reaches the preset shock temperature, and then perform a cyclic hot and cold alternating shock test.

[0138] In some optional implementations, the control module 303 includes:

[0139] The first calculation unit is used to calculate a proportional term according to the temperature deviation and the proportional gain, where the proportional term is used to reflect the influence of the deviation between the current temperature value and the preset shock temperature.

[0140] The second calculation unit is used to calculate an integral term according to the accumulated temperature deviation and the integral gain, where the integral term is used to reflect the influence of a small accumulated temperature deviation.

[0141] The third calculation unit is used to calculate a differential term according to the change rate of the temperature deviation and the differential gain, where the differential term is used to reflect the influence of the change rate of the temperature deviation.

[0142] The fourth calculation unit is used to determine the PID parameter adjustment signal according to the addition result of the proportional term, the integral term and the differential term.

[0143] In some optional implementations, the control module 303 further includes:

[0144] The driving unit is used to send PID parameter adjustment signals to the heating element and the cooling element to drive the heating element to heat or the cooling element to cool.

[0145] In some optional embodiments, the device further comprises:

[0146] The first judgment module is used to accumulate the temperature deviation and judge whether the accumulated temperature deviation changes.

[0147] The module is set to calculate the integral time constant if the temperature deviation changes, and to set the integral gain according to the integral time constant.

[0148] In some optional embodiments, the device further comprises:

[0149] The setting module is used to pre-set the integral term limit.

[0150] The accumulation stop module is used to stop the accumulation of the integral term if the integral term reaches a preset integral term limit.

[0151] In some optional embodiments, the device further comprises:

[0152] The second judgment module is used to judge whether the differential term correction value meets the preset rule, and the preset rule is that the change rate of the temperature deviation is less than the maximum change rate.

[0153] The execution module is used to execute the step of determining the PID parameter adjustment signal according to the addition result of the proportional term, the integral term and the differential term if the differential term correction value meets the preset rule.

[0154] The ignore module is used to ignore the differential effect if the differential term correction value does not meet the preset rules.

[0155] The further functional description of each of the above modules and units is the same as that of the above corresponding embodiments and will not be repeated here.

[0156] The temperature control device for ink weather resistance testing in this embodiment is presented in the form of a functional unit, where the unit refers to an ASIC (Application Specific Integrated Circuit) circuit, a processor and memory that executes one or more software or fixed programs, and / or other devices that can provide the above functions.

[0157] The embodiment of the present invention also provides a computer device having the above Figure 3 The temperature control device used for ink weathering test is shown.

[0158] See also Figure 4 , Figure 4 is a schematic diagram of the structure of a computer device provided by an optional embodiment of the present invention, such as Figure 4 As shown, the computer device includes: one or more processors 10, a memory 20, and interfaces for connecting various components, including high-speed interfaces and low-speed interfaces. Various components are connected to each other using different buses for communication, and can be installed on a common mainboard or installed in other ways as needed. The processor can process the instructions executed in the computer device, including instructions stored in or on the memory to display the graphical information of the GUI on an external input / output device (such as, a display device coupled to the interface). In some optional embodiments, if necessary, multiple processors and / or multiple buses can be used together with multiple memories and multiple memories. Similarly, multiple computer devices can be connected, and each device provides some necessary operations (for example, as a server array, a group of blade servers, or a multi-processor system). Figure 4 A processor 10 is taken as an example.

[0159] The processor 10 may be a central processing unit, a network processor or a combination thereof. The processor 10 may further include a hardware chip. The hardware chip may be a dedicated integrated circuit, a programmable logic device or a combination thereof. The programmable logic device may be a complex programmable logic device, a field programmable gate array, a general purpose array logic or any combination thereof.

[0160] The memory 20 stores instructions executable by at least one processor 10, so that at least one processor 10 executes the method shown in the above embodiment.

[0161] The memory 20 may include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required for at least one function; the data storage area may store data created according to the use of the computer device, etc. In addition, the memory 20 may include a high-speed random access memory, and may also include a non-transient memory, such as at least one disk storage device, a flash memory device, or other non-transient solid-state storage device. In some optional embodiments, the memory 20 may optionally include a memory remotely arranged relative to the processor 10, and these remote memories may be connected to the computer device via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0162] The memory 20 may include a volatile memory, such as a random access memory; the memory may also include a non-volatile memory, such as a flash memory, a hard disk or a solid state drive; the memory 20 may also include a combination of the above types of memory.

[0163] The computer device also includes an input device 30 and an output device 40. The processor 10, the memory 20, the input device 30 and the output device 40 may be connected via a bus or other means. Figure 4 The example of connecting through bus is taken in the following.

[0164] The input device 30 can receive input digital or character information and generate key signal input related to user settings and function control of the computer device, such as a touch screen, etc. The output device 40 can include a display device, etc.

[0165] The embodiment of the present invention also provides a computer-readable storage medium. The method according to the embodiment of the present invention can be implemented in hardware, firmware, or can be implemented as a computer code that can be recorded in a storage medium, or can be implemented as a computer code that is originally stored in a remote storage medium or a non-temporary machine-readable storage medium and will be stored in a local storage medium through a network download, so that the method described herein can be stored in such software processing on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. Among them, the storage medium can be a magnetic disk, an optical disk, a read-only storage memory, a random access memory, a flash memory, a hard disk or a solid-state hard disk, etc.; further, the storage medium can also include a combination of the above types of memories. It can be understood that a computer, a processor, a microprocessor controller, or programmable hardware includes a storage component that can store or receive software or computer code. When the software or computer code is accessed and executed by a computer, a processor, or hardware, the method shown in the above embodiment is implemented.

[0166] A part of the present invention may be applied as a computer program product, such as a computer program instruction, which, when executed by a computer, can call or provide the method and / or technical solution according to the present invention through the operation of the computer. Those skilled in the art should understand that the existence of the computer program instruction in a computer-readable medium includes, but is not limited to, a source file, an executable file, an installation package file, etc., and accordingly, the way in which the computer program instruction is executed by the computer includes, but is not limited to: the computer directly executes the instruction, or the computer compiles the instruction and then executes the corresponding compiled program, or the computer reads and executes the instruction, or the computer reads and installs the instruction and then executes the corresponding installed program. Here, the computer-readable medium may be any available computer-readable storage medium or communication medium accessible to the computer.

[0167] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope of the present application.

Claims

1. A temperature control method for ink weatherability testing, characterized in that: A temperature control system applied to an ink tolerance test, wherein the temperature control system for the ink tolerance test comprises a thermal shock test device, wherein the thermal shock test device is used to perform an ink weatherability test, and the method comprises: Get the current temperature value of the thermal shock test equipment when performing ink weather resistance test; Compare the current temperature value with the preset shock temperature to obtain a temperature deviation, wherein the preset shock temperature includes a hot shock temperature and a cold shock temperature; A corresponding PID parameter adjustment signal is generated according to the temperature deviation, and PID control is performed until the temperature reaches the preset shock temperature, and then the temperature is kept warm, and a cyclic hot and cold alternating shock test is performed.

2. The method according to claim 1, characterized in that Generating a corresponding PID parameter adjustment signal according to the temperature deviation comprises: Calculating a proportional term according to the temperature deviation and the proportional gain, wherein the proportional term is used to reflect the influence of the deviation between the current temperature value and the preset shock temperature; Calculating an integral term according to the accumulated temperature deviation and the integral gain, wherein the integral term is used to reflect the influence of a small accumulated temperature deviation; Calculating a differential term according to the rate of change of the temperature deviation and a differential gain, wherein the differential term is used to reflect the influence of the rate of change of the temperature deviation; The PID parameter adjustment signal is determined according to the addition result of the proportional term, the integral term and the differential term.

3. The method according to claim 2, characterized in that The temperature control system of the ink tolerance test further includes a heating element and a cooling element, and the PID control includes: The PID parameter adjustment signal is sent to the heating element and the cooling element to drive the heating element to heat or the cooling element to cool.

4. The method according to claim 2, characterized in that: Before calculating the integral term according to the accumulated temperature deviation and the integral gain, the method further includes: Accumulated temperature deviation, judging whether the accumulated temperature deviation has changed; If the temperature deviation changes, the integral time constant is calculated and the integral gain is set according to the integral time constant.

5. The method according to claim 2, characterized in that: After calculating the integral term according to the accumulated temperature deviation and the integral gain, the method further includes: Preset integral term limit; If the integral term reaches the preset integral term limit, the accumulation of the integral term is stopped.

6. The method according to claim 2, characterized in that After calculating the differential term according to the rate of change of the temperature deviation and the differential gain, the method further includes: Determine whether the differential correction value meets a preset rule, wherein the preset rule is that the rate of change of the temperature deviation is less than the maximum rate of change; If the differential term correction value meets the preset rule, the step of determining the PID parameter adjustment signal according to the addition result of the proportional term, the integral term and the differential term is performed; If the derivative term correction value does not meet the preset rules, the derivative effect is ignored.

7. A temperature control device for ink weatherability testing, characterized in that: The device comprises: An acquisition module is used to obtain the current temperature value of the hot and cold shock test equipment when performing ink weather resistance test; A comparison module, used for comparing the current temperature value with a preset shock temperature to obtain a temperature deviation, wherein the preset shock temperature includes a hot shock temperature and a cold shock temperature; The control module is used to generate a corresponding PID parameter adjustment signal according to the temperature deviation, perform PID control, keep the temperature until the temperature reaches a preset shock temperature, and perform a cyclic hot and cold alternating shock test.

8. A computer device, characterized in that: include: A memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the temperature control method for ink weather resistance testing according to any one of claims 1 to 6 by executing the computer instructions.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a computer to execute the temperature control method for ink weatherability testing according to any one of claims 1 to 6.

10. A computer program product, characterized in that The invention comprises computer instructions for causing a computer to execute the temperature control method for ink weatherability test according to any one of claims 1 to 6.

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