Oil bath circulation test equipment and temperature regulation and control method thereof

Abstract

The invention discloses oil bath circulation test equipment and a temperature regulation and control method thereof, the oil bath circulation test equipment comprises an oil cooler module, a temperature detection module and a main control module, the temperature detection module is arranged on one side of an oil liquid input port of a test clamp, and the main control module is used for setting target temperatures in a non-constant-temperature period and a constant-temperature period; wherein the non-constant-temperature time period and the constant-temperature time period are continuous time periods; the main control module is further used for dynamically determining the regulation and control compensation temperature according to the target temperature at the current moment in the non-constant-temperature time period and the constant-temperature time period and the detected first temperature, and determining the regulation and control temperature of the oil cooler module according to the target temperature at the current moment and the regulation and control compensation temperature. The influence of environment temperature and / or pipeline loss is reduced, the deviation between the set target temperature and the oil temperature input into the test clamp is reduced, and the temperature stability of oil entering the test clamp is improved.

Description

TECHNICAL FIELD

[0001] The embodiment of the present application relates to the technical field of device control, in particular to an oil bath circulating test device and a temperature regulation method thereof. BACKGROUND

[0002] In the development process of lithium batteries, different temperature test environments need to be built for the batteries, wherein the common equipment of the immersion cooling system includes an oil cooler and a test fixture, and the battery to be tested needs to be placed in the test fixture.

[0003] The oil cooler is an oil temperature control device, and the oil cooler and the test fixture are connected by an oil pipe. The oil cooler is responsible for providing the oil temperature required for testing. Because the oil cooler and the test fixture have a certain distance during the testing process, the set target temperature of the oil cooler and the oil temperature input to the test fixture have a deviation due to the heat dissipation of the external environment and the oil pipe. SUMMARY

[0004] The present application provides an oil bath circulating test device and a temperature regulation method thereof, which can reduce the influence of environmental temperature and / or pipeline loss, reduce the deviation between the set target temperature and the oil temperature input to the test fixture, and improve the temperature stability of the oil entering the test fixture.

[0005] In a first aspect, the embodiment of the present application provides an oil bath circulating test device, comprising:

[0006] An oil cooler module is connected to the oil liquid input port and the oil liquid output port of the test fixture through a pipeline;

[0007] A temperature detection module is arranged on one side of the oil liquid input port of the test fixture, and is used for detecting the first temperature of the oil liquid input into the oil liquid input port in real time;

[0008] A main control module is connected to the temperature detection module, and is used for setting the target temperature of the non-constant temperature period and the constant temperature period; wherein the non-constant temperature period and the constant temperature period are continuous periods;

[0009] The main control module is further used for dynamically determining a regulation compensation temperature according to the target temperature at the current time in the non-constant temperature period and the constant temperature period and the detected first temperature, and determining the regulation temperature of the oil cooler module according to the target temperature at the current time and the regulation compensation temperature.

[0010] Optionally, the main control module comprises a first compensation unit and a first calculation unit;

[0011] The first compensation unit is used to obtain the difference between the target temperature and the detected first temperature at the current moment in the non-constant temperature period and the constant temperature period, and to determine the adjustment compensation temperature according to the set first compensation coefficient; wherein, the first compensation coefficient is negatively correlated with the time from the initial temperature at the beginning of the non-constant temperature period to the target temperature at the end of the non-constant temperature period.

[0012] The first calculation unit is used to determine the control temperature based on the target temperature and the control compensation temperature at the current moment.

[0013] Optionally, the first calculation unit is used to determine the controlled temperature according to a first compensation formula, wherein the first compensation formula is:

[0014] T1n' = T1n + (T1n - T2n) * K1;

[0015] In the formula, T1n' is the controlled temperature at time n, (T1n-T2n)*K1 is the controlled compensation temperature at time n, where T1n is the target temperature at time n, T2n is the first temperature at time n, and K1 is the first compensation coefficient.

[0016] Optionally, the main control module includes a second compensation unit, a third compensation unit, and a first calculation unit;

[0017] The second compensation unit is used to obtain the difference between the target temperature and the detected first temperature at the current moment in the non-constant temperature period and the constant temperature period, and to determine the adjustment compensation temperature according to the set second compensation coefficient; wherein, the second compensation coefficient is negatively correlated with the time from the initial temperature at the beginning of the non-constant temperature period to the target temperature at the end of the non-constant temperature period.

[0018] The third compensation unit is used to determine the set value control compensation temperature;

[0019] The first calculation unit is used to determine the control temperature based on the target temperature at the current time, the control compensation temperature, and the set value control compensation temperature.

[0020] Optionally, the first calculation unit is used to determine the controlled temperature according to a second compensation formula, wherein the second compensation formula is:

[0021] T1n' = T1n + (T1n - T2n) * K2 + B;

[0022] In the formula, T1n' is the controlled temperature at time n, (T1n-T2n)*K2 is the controlled compensation temperature at time n, where T1n is the target temperature at time n, T2n is the first temperature at time n, K2 is the second compensation coefficient, and B is the fixed value controlled compensation temperature.

[0023] Optionally, the fixed-value adjustment compensation temperature is the difference between the target temperature and the first temperature at the corresponding moment during the constant temperature period.

[0024] Optionally, the first calculation unit is further configured to output the controlled temperature as the upper limit controlled temperature when the controlled temperature is greater than the upper limit controlled temperature of the oil cooler module;

[0025] The first calculation unit is also used to output the controlled temperature as the lower limit controlled temperature when the controlled temperature is lower than the lower limit controlled temperature of the oil cooler module.

[0026] Secondly, embodiments of the present invention provide a temperature control method for an oil bath circulation testing device, the oil bath circulation testing device comprising: an oil cooler module, a temperature detection module, and a main control module;

[0027] The temperature control method includes:

[0028] The temperature detection module detects the first temperature of the oil input to the oil inlet of the test fixture in real time;

[0029] The main control module sets the target temperatures for non-constant temperature periods and constant temperature periods; wherein, the non-constant temperature periods and the constant temperature periods are continuous periods;

[0030] The main control module dynamically determines the adjustment compensation temperature based on the target temperature and the detected first temperature at the current moment during the non-constant temperature period and the constant temperature period, and determines the adjustment temperature of the oil cooler module based on the target temperature and the adjustment compensation temperature at the current moment.

[0031] Optionally, the main control module includes a first compensation unit and a first calculation unit;

[0032] The temperature control method includes:

[0033] The first compensation unit obtains the difference between the target temperature and the detected first temperature at the current moment in the non-constant temperature period and the constant temperature period, and determines the adjustment compensation temperature according to the set first compensation coefficient; wherein, the first compensation coefficient is negatively correlated with the time from the initial temperature at the beginning of the non-constant temperature period to the target temperature at the end of the non-constant temperature period.

[0034] The first calculation unit determines the control temperature based on the target temperature and the control compensation temperature at the current moment.

[0035] Optionally, the main control module includes a second compensation unit, a third compensation unit, and a first calculation unit;

[0036] The temperature control method includes:

[0037] The second compensation unit obtains the difference between the target temperature and the detected first temperature at the current moment in the non-constant temperature period and the constant temperature period, and determines the adjustment compensation temperature according to the set second compensation coefficient; wherein, the second compensation coefficient is negatively correlated with the time from the initial temperature at the beginning of the non-constant temperature period to the target temperature at the end of the non-constant temperature period.

[0038] The third compensation unit determines a set value to regulate the compensation temperature;

[0039] The first calculation unit determines the control temperature based on the target temperature, the control compensation temperature, and the fixed value control compensation temperature at the current time.

[0040] The oil bath circulation testing equipment provided in this invention includes a temperature detection module on the oil inlet side of the test fixture. This module can detect the initial temperature of the oil input to the inlet in real time. The main control module sets target temperatures for non-constant temperature periods and constant temperature periods to establish the test conditions for the battery under test. Specifically, the main control module dynamically determines the adjustment compensation temperature based on the target temperature and the detected initial temperature at the current moment during the non-constant temperature period, compensating for the adjustment temperature at each moment during the non-constant temperature period to make the initial temperature closer to the target temperature during the non-constant temperature phase. Similarly, the main control module dynamically determines the adjustment compensation temperature based on the target temperature and the detected initial temperature at the current moment during the constant temperature period, compensating for the adjustment temperature at each moment during the constant temperature period to make the initial temperature closer to the target temperature during the constant temperature phase. This reduces the impact of ambient temperature and / or pipeline losses, reduces the deviation between the set target temperature and the oil temperature input to the test fixture, and improves the temperature stability of the oil entering the test fixture. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of the structure of an oil bath circulation testing device provided in an embodiment of the present invention;

[0042] Figure 2 This is a schematic diagram illustrating the relationship between target temperature and time in an embodiment of the present invention;

[0043] Figure 3 This is a schematic diagram illustrating the relationship between target temperature and time in another embodiment of the present invention;

[0044] Figure 4 This is a schematic diagram showing a comparison between a target temperature and an actual temperature provided in an embodiment of the present invention;

[0045] Figure 5 This is a schematic diagram showing a comparison between a target temperature and an actual temperature, provided in another embodiment of the present invention.

[0046] Figure 6 A schematic diagram of the structure of another oil bath circulation testing device is provided for embodiments of the present invention;

[0047] Figure 7 This provides another schematic diagram of the curve of the first temperature after compensation for an embodiment of the present invention;

[0048] Figure 8 A schematic diagram of the structure of another oil bath circulation testing device is provided for embodiments of the present invention;

[0049] Figure 9 This is a schematic flowchart illustrating a temperature control method for an oil bath circulation testing device provided in an embodiment of the present invention. Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0051] In the development of lithium batteries, test environments with different temperatures need to be set up for the batteries. Among them, the commonly used equipment for immersion cooling systems includes oil coolers and test fixtures, and the batteries under test need to be placed in the test fixtures.

[0052] As an oil temperature control device, the oil cooler operates on the principle that its internal oil circuit connects to the heating and cooling systems. A temperature control and acquisition system regulates the oil to the target temperature, and the flow rate is then adjusted by an external oil circuit before being output to the test fixture. Because the temperature is regulated using proportional, integral, and derivative control methods, the temperature measurement point must be internal to ensure timely and accurate control.

[0053] The oil cooler and the test fixture are connected by an oil pipe. The oil cooler is responsible for providing the oil temperature required for the test. Because there is a certain distance between the oil cooler and the test fixture during the test, due to the external environment and heat dissipation from the oil pipe, there is a deviation between the target temperature set by the oil cooler and the oil temperature input to the test fixture.

[0054] To reduce the impact of the environment on oil pipe temperature loss, the traditional method to address oil temperature difference is to set a compensation temperature on the oil cooler to compensate for the loss of oil pipe at different temperatures. However, if the ambient temperature changes, the compensation value needs to be manually adjusted in a timely manner, which results in a delay between the target temperature set by the oil cooler and the oil temperature input by the test fixture.

[0055] In view of this, Figure 1 This is a schematic diagram of the structure of an oil bath circulation testing device provided in an embodiment of the present invention. See also: Figure 1 ,include:

[0056] The oil cooler module 110 is connected to the oil inlet and oil outlet of the test fixture 130 via pipes;

[0057] The temperature detection module 120 is set on the oil inlet side of the test fixture 130 and is used to detect the first temperature of the oil input to the oil inlet in real time.

[0058] The main control module 140 is connected to the temperature detection module 120. The main control module 140 is used to set the target temperature for non-constant temperature periods and constant temperature periods; wherein, the non-constant temperature periods and constant temperature periods are continuous periods.

[0059] The main control module 140 is also used to dynamically determine the control compensation temperature based on the target temperature and the detected first temperature at the current moment during the non-constant temperature period, and to determine the control temperature of the oil cooler module 110 based on the target temperature and the control compensation temperature at the current moment.

[0060] Specifically, the oil chiller module 110 can be an existing oil chiller, which includes a heating system, a cooling system, an internal oil circuit, an external oil circuit, and a temperature sensing control system. The output temperature of the oil chiller is regulated using an internal PID controller. It should be noted that in this embodiment, an oil chiller is used as an ambient temperature regulating device. In other embodiments, liquid chillers using other media can also be used as ambient temperature regulating devices; no specific limitations are made here. The oil chiller module 110 includes an outlet and a return port. The oil inlet and outlet of the test fixture 130 are connected to the outlet and return port of the oil chiller module 110 respectively via pipes, thus forming an oil circulation loop. The temperature detection module 120 is located on the oil inlet side of the test fixture 130 and can detect the initial temperature of the oil input to the test fixture 130 in real time. For example, the temperature detection module 120 can use a temperature sensing wire, which is installed inside a pipe to detect the initial temperature change of the oil.

[0061] According to the testing requirements, the target temperature for non-constant temperature periods and constant temperature periods can be set independently through the main control module 140. Each moment in the non-constant temperature period and constant temperature period can correspond to a target temperature. The non-constant temperature period can refer to the period when the oil temperature rises or falls from the initial temperature to the target temperature, and the constant temperature period can refer to the period when the oil temperature is constant at the target temperature. Figure 2 This is a schematic diagram illustrating the relationship between target temperature and time in an embodiment of the present invention. For example, taking the heating process as an example, the time period t1-t2 is a non-constant temperature period, and t2-t3 is a constant temperature period. Figure 3 This is another schematic diagram illustrating the relationship between target temperature and time provided in an embodiment of the present invention. For example, taking the cooling process as an example, the time period t1-t2 is a non-constant temperature period, and t2-t3 is a constant temperature period. Figure 4 This is a schematic diagram comparing the target temperature and the actual temperature provided in an embodiment of the present invention. See [link / reference]. Figure 4 Taking the heating process as an example, in practical applications, if the temperature regulation of the oil cooler module 110 is not compensated, the temperature regulation of the oil cooler module 110 will rise from the initial temperature to the constant temperature process. The oil temperature input by the test fixture 130, that is, the first temperature before compensation, will have a large deviation from the target temperature. This will also lead to a longer non-constant temperature period, while the corresponding constant temperature period will be unstable. Figure 5 This is another schematic diagram comparing the target temperature and the actual temperature provided in an embodiment of the present invention. See also... Figure 5 Taking the cooling process as an example, in practical applications, if the temperature regulation of the oil cooler module 110 is not compensated, the temperature regulation of the oil cooler module 110 will decrease from the initial temperature to the constant temperature process. The oil temperature input by the test fixture 130, i.e. the first temperature before compensation, will have a large deviation from the target temperature. This will also lead to a longer non-constant temperature period, while the corresponding constant temperature period will be unstable.

[0062] The significant deviation between the first temperature and the target temperature is due to the influence of ambient temperature and / or pipeline losses. To reduce external influences, the controlled temperature of the oil cooler module 110 needs to be compensated. For example, during the heating process, the controlled temperature of the oil cooler module 110 can be increased to raise the first temperature; during the cooling process, the controlled temperature of the oil cooler module 110 can be decreased to lower the first temperature, thus bringing the first temperature closer to the target temperature during non-constant temperature periods. Therefore, by combining the target temperature at the current moment during a non-constant temperature period with the detected first temperature at the current moment, the controlled compensation temperature for the current moment in the non-constant temperature period can be dynamically determined. For example, using the difference between the target temperature at the current moment and the detected first temperature at the corresponding moment as an adjustment benchmark, a proportional adjustment can be made as the controlled compensation temperature for the current moment. The controlled temperature of the oil cooler module 110 is adjusted based on the controlled compensation temperature at the current moment. Based on this, the controlled temperature at each moment in the non-constant temperature period can be compensated, making the first temperature closer to the target temperature during the non-constant temperature phase. After entering the isothermal phase, due to compensation during the non-isothermal phase, the difference between the target temperature and the first temperature detected at the corresponding moment tends to stabilize. Therefore, the adjustment of the compensation temperature will also stabilize. This allows the target temperature and the first temperature detected at the corresponding moment to be closer at each moment during the isothermal period, thereby improving the temperature stability of the oil entering the test fixture 130. It should be noted that "the target temperature and the first temperature are close" here can be understood as the difference between the target temperature and the first temperature being within a preset range. For example, the preset range can be set to 0-1℃ or 0-2℃, etc., as needed.

[0063] The oil bath circulation testing equipment provided in this embodiment of the invention includes a temperature detection module 120 on the oil inlet side of the test fixture 130. The temperature detection module 120 can detect the first temperature of the oil input to the oil inlet in real time. The main control module 140 sets the target temperatures for non-constant temperature periods and constant temperature periods to establish the test conditions for the battery under test. Specifically, the main control module 140 dynamically determines the adjustment compensation temperature based on the target temperature and the detected first temperature at the current moment during the non-constant temperature period, compensating for the adjustment temperature at each moment during the non-constant temperature period, so that the first temperature is closer to the target temperature during the non-constant temperature phase. Similarly, the main control module 140 dynamically determines the adjustment compensation temperature based on the target temperature and the detected first temperature at the current moment during the constant temperature period, compensating for the adjustment temperature at each moment during the constant temperature period, so that the first temperature is closer to the target temperature during the constant temperature phase. This reduces the influence of ambient temperature and / or pipeline losses, reduces the deviation between the set target temperature and the oil temperature input to the test fixture 130, and improves the temperature stability of the oil entering the test fixture 130.

[0064] Figure 6A schematic diagram of another oil bath circulation testing device is provided for embodiments of the present invention. See [link to schematic diagram]. Figure 6 The main control module 140 includes a first compensation unit 141 and a first calculation unit 142;

[0065] The first compensation unit 141 is used to obtain the difference between the target temperature and the detected first temperature at the current moment in the non-constant temperature period and the constant temperature period, and to determine the adjustment compensation temperature according to the set first compensation coefficient; wherein, the first compensation coefficient is negatively correlated with the time from the initial temperature at the beginning of the non-constant temperature period to the target temperature at the end of the non-constant temperature period.

[0066] The first calculation unit 142 is used to determine the control temperature based on the target temperature and the control compensation temperature at the current moment.

[0067] Specifically, during the non-constant temperature period and the constant temperature period, there is a deviation between the first temperature and the target temperature. The difference between the first temperature and the target temperature is used as the control target. During the heating process, the temperature control of the oil cooler module 110 can be increased to compensate for the temperature effects caused by ambient temperature and / or pipeline losses, making the first temperature of the oil input to the test fixture 130 closer to the target temperature. During the cooling process, the temperature control of the oil cooler module 110 can be decreased, which is equivalent to decreasing the control temperature, to compensate for the temperature effects caused by ambient temperature and / or pipeline losses, making the first temperature of the oil input to the test fixture 130 closer to the target temperature.

[0068] Figure 7 To illustrate another embodiment of the present invention, a schematic diagram of the curve of the first temperature after compensation is provided. See also: Figure 7 Taking the heating process as an example, during the non-constant temperature period, the first compensation unit 141 obtains the difference between the target temperature and the detected first temperature at the current moment during the non-constant temperature period. It then uses a first compensation coefficient to proportionally adjust the difference at the current moment to compensate for the temperature effects caused by ambient temperature and / or pipeline losses, thereby determining the control compensation temperature. The first calculation unit 142 determines the control temperature based on the target temperature and the control compensation temperature at the current moment. For example, the control temperature is determined by adding the target temperature and the control compensation temperature at the current moment. Based on the positive or negative relationship between the difference between the target temperature and the first temperature, the control temperature can be increased or decreased. In this embodiment of the invention, the difference between the target temperature and the first temperature is positive, thus providing positive compensation, increasing the control temperature, and achieving compensation for the control temperature at each moment.

[0069] Similarly, during the constant temperature period, the first compensation unit 141 obtains the difference between the target temperature and the detected first temperature at the current moment during the constant temperature period, and uses the first compensation coefficient to proportionally adjust the difference at the current moment to compensate for the temperature influence caused by ambient temperature and / or pipeline losses, thereby determining the control compensation temperature. The first calculation unit 142 determines the control temperature based on the target temperature and the control compensation temperature at the current moment. Due to the compensation during the non-constant temperature phase, the difference between the target temperature and the detected first temperature at the corresponding moment tends to stabilize, so the control compensation temperature will also stabilize. This allows the target temperature and the detected first temperature at each moment during the constant temperature period to be closer, while improving the temperature stability of the oil entering the test fixture 130.

[0070] Among them, the first compensation coefficient is negatively correlated with the time from the initial temperature rise at the beginning of the non-isothermal period to the target temperature at the end of the non-isothermal period, that is, the first compensation coefficient is negatively correlated with the duration of the t1-t2 period. Figure 7 If the temperature regulation of the oil cooler module 110 is not compensated, the actual non-constant temperature period may become longer. In order to shorten the actual non-constant temperature period and make the actual non-constant temperature period closer to the set non-constant temperature period, the first compensation coefficient can be increased to increase the regulation temperature and thus shorten the time for the first temperature to reach the target temperature at the end.

[0071] Based on the above embodiments, optionally, the first calculation unit 142 can determine the control temperature according to the first compensation formula, wherein the first compensation formula is:

[0072] T1n' = T1n + (T1n - T2n) * K1;

[0073] In the formula, T1n' is the control temperature at time n, (T1n-T2n)*K1 is the control compensation temperature at time n, where T1n is the target temperature at time n, T2n is the first temperature at time n, and K1 is the first compensation coefficient.

[0074] Specifically, the difference between the initial temperature and the target temperature at a given moment can be used as the control target. During the heating process, the control temperature of the oil cooler module 110 can be increased to compensate for the temperature effects caused by ambient temperature and / or pipeline losses, making the initial temperature of the oil input to the test fixture 130 closer to the target temperature. During the cooling process, the control temperature of the oil cooler module 110 can be decreased to compensate for the temperature effects caused by ambient temperature and / or pipeline losses, making the initial temperature of the oil input to the test fixture 130 closer to the target temperature. Based on the positive or negative relationship between the target temperature and the initial temperature difference, the control temperature can be increased or decreased, thereby compensating for the control temperature at each moment.

[0075] The first compensation coefficient can be determined during the initial commissioning of the oil bath circulation test equipment. For example, after the test environment of the oil bath circulation test equipment is set up and the external conditions such as environment and pipelines are determined, the target temperatures for non-constant temperature periods and constant temperature periods are set through the main control module 140. The curve of the first temperature changing over time under uncompensated conditions is then tested, combined with... Figure 4 and Figure 5 By fitting data or setting different first compensation coefficients, multiple tests are conducted to select the first compensation coefficient that can make the target temperature during non-constant temperature periods and constant temperature periods close to the first temperature. This first compensation coefficient is then determined as the first compensation coefficient under the current external conditions.

[0076] Figure 8 A schematic diagram of another oil bath circulation testing device is provided for embodiments of the present invention. See [link to schematic diagram]. Figure 8 The main control module 140 includes a second compensation unit 143, a third compensation unit 144, and a first calculation unit 142;

[0077] The second compensation unit 143 is used to obtain the difference between the target temperature and the detected first temperature at the current moment in the non-constant temperature period and the constant temperature period, and to determine the adjustment compensation temperature according to the set second compensation coefficient; wherein, the second compensation coefficient is negatively correlated with the time from the initial temperature at the beginning of the non-constant temperature period to the target temperature at the end of the non-constant temperature period.

[0078] The third compensation unit 144 is used to determine the setpoint control compensation temperature;

[0079] The first calculation unit 142 is used to determine the control temperature based on the target temperature, the control compensation temperature, and the set value control compensation temperature at the current moment.

[0080] Specifically, during non-constant temperature periods and constant temperature periods, the second compensation unit 143 obtains the difference between the target temperature and the detected first temperature at the current moment in the corresponding period, and uses the second compensation coefficient to proportionally adjust the difference at the current moment to compensate for the temperature influence caused by ambient temperature and / or pipeline losses, thereby determining the control compensation temperature.

[0081] Because of the lag in temperature compensation and heat transfer in the pipeline during the entire temperature control compensation process, when the first calculation unit 142 determines the control temperature based solely on the control compensation temperature, it also needs to consider... Figure 7It can be observed that a slight difference still exists between the target temperature and the compensated first temperature. Further, in this embodiment of the invention, a fixed-value adjustment compensation temperature is provided by the third compensation unit 144 to compensate for this slight difference, so that the first temperature is closer to the target temperature. For example, the fixed-value adjustment compensation temperature can be the difference between the target temperature and the first temperature during the constant-temperature period. Based on the above embodiment, the second compensation coefficient is negatively correlated with the time it takes for the initial temperature at the beginning of the non-constant-temperature period to rise to the target temperature at the end of the non-constant-temperature period. If the temperature control of the oil cooler module 110 is not compensated, the actual non-constant-temperature period may become longer. To shorten the actual non-constant-temperature period and make it closer to the set non-constant-temperature period, the second compensation coefficient can be increased, thereby shortening the time it takes for the first temperature to reach the target temperature at the end.

[0082] Based on the above embodiments, optionally, the first calculation unit 142 can determine the control temperature according to the second compensation formula, wherein the second compensation formula is:

[0083] T1n' = T1n + (T1n - T2n) * K2 + B;

[0084] In the formula, T1n' is the control temperature at time n, (T1n-T2n)*K2 is the control compensation temperature at time n, where T1n is the target temperature at time n, T2n is the first temperature at time n, K2 is the second compensation coefficient, and B is the fixed value control compensation temperature.

[0085] Specifically, the difference between the initial temperature and the target temperature at a given moment can be used as the control target. During the heating process, the control temperature of the oil cooler module 110 can be increased to compensate for the temperature effects caused by ambient temperature and / or pipeline losses, making the initial temperature of the oil input to the test fixture 130 closer to the target temperature. During the cooling process, the control temperature of the oil cooler module 110 can be decreased to compensate for the temperature effects caused by ambient temperature and / or pipeline losses, making the initial temperature of the oil input to the test fixture 130 closer to the target temperature. Based on the positive or negative relationship between the target temperature and the initial temperature difference, the control temperature can be increased or decreased, thereby compensating for the control temperature at each moment.

[0086] The second compensation coefficient can be the same as the first compensation coefficient. For example, the second compensation coefficient can be determined during the initial debugging process of the oil bath circulation test equipment. After the test environment of the oil bath circulation test equipment is set up and the external conditions such as environment and pipelines are determined, the target temperatures for non-constant temperature periods and constant temperature periods are set through the main control module 140. The curve of the first temperature changing over time under uncompensated conditions is tested, combined with... Figure 4 and Figure 5By performing multiple tests through data fitting or setting different second compensation coefficients, the second compensation coefficient that makes the target temperature during both non-constant temperature periods and constant temperature periods close to the first temperature is selected and determined as the second compensation coefficient under the current external conditions. At this point, the second compensation coefficient can be the same as the first compensation coefficient. Then, the difference between the target temperature and the first temperature during the constant temperature period is taken as the fixed-value control compensation temperature. Since the difference between the target temperature and the first temperature during the constant temperature period is small, it has little impact on the original control temperature during the non-constant temperature periods, so the fixed-value control compensation temperature can be directly used as the compensation value.

[0087] In other embodiments, the second compensation coefficient may also be different from the first compensation coefficient. For example, through the above data processing or testing, a known second compensation coefficient and a fixed-value control compensation temperature can be obtained. Then, the known second compensation coefficient is replaced with an unknown compensation coefficient, and multiple tests are performed again by data fitting or setting different second compensation coefficients. The compensation coefficient that can make the target temperature during non-constant temperature periods and constant temperature periods close to the first temperature is selected as the new second compensation coefficient. At this time, it is equivalent to taking the fixed-value control compensation temperature into account in the compensation formula, fitting a new second compensation coefficient, which can make the difference between the first temperature and the target temperature smaller.

[0088] Based on the above embodiments, optionally, during the compensation process using the first compensation formula or the second compensation formula, for example, when the equipment is just started, the difference between the target temperature and the first temperature may be too large, resulting in the controlled temperature being too high or too low, thus causing operational risks. Therefore, the first calculation unit 142 also outputs the controlled temperature as the upper limit controlled temperature when the controlled temperature is greater than the upper limit controlled temperature of the oil cooler module 110, and outputs the controlled temperature as the lower limit controlled temperature when the controlled temperature is less than the lower limit controlled temperature of the oil cooler module 110. That is, when the compensated controlled temperature is greater than the upper limit controlled temperature, the upper limit controlled temperature is output; when the compensated controlled temperature is less than the lower limit controlled temperature, the lower limit controlled temperature is output, to ensure the stability of the temperature control of the oil cooler module 110.

[0089] Figure 9 This is a flowchart illustrating a temperature control method for an oil bath circulation testing device according to an embodiment of the present invention. This embodiment is applicable to temperature control situations, and the method can be executed by an oil bath circulation testing device, which can be implemented in hardware and / or software. The method specifically includes the following steps:

[0090] S110, Temperature detection module 120 detects the first temperature of the oil input to the oil inlet of test fixture 130 in real time;

[0091] The temperature detection module 120 is located on the oil inlet side of the test fixture 130 and can detect the initial temperature of the oil input to the test fixture 130 in real time. For example, the temperature detection module 120 can be a temperature sensing wire installed inside a pipe to detect the initial temperature change of the oil.

[0092] S120 and main control module 140 set the target temperature for non-constant temperature periods and constant temperature periods; wherein, the non-constant temperature periods and constant temperature periods are continuous periods;

[0093] In this context, each moment in the non-constant temperature period and the constant temperature period can correspond to a target temperature. The non-constant temperature period can refer to the time when the oil temperature rises or falls from the initial temperature to the target temperature, and the constant temperature period can refer to the time when the oil temperature is constant at the target temperature.

[0094] S130 and main control module 140 dynamically determine the control compensation temperature based on the target temperature and the detected first temperature at the current moment during the non-constant temperature period and the constant temperature period, and determine the control temperature of oil cooler module 110 based on the target temperature and control compensation temperature at the current moment.

[0095] Specifically, by combining the target temperature and the first temperature detected at the current moment during the non-constant temperature period, the adjustment compensation temperature for the current moment during the non-constant temperature period can be dynamically determined. For example, using the difference between the target temperature and the first temperature detected at the corresponding moment during the non-constant temperature period as the adjustment benchmark, the adjustment compensation temperature for the current moment is obtained through proportional adjustment. The adjustment temperature of the oil cooler module 110 is adjusted based on the adjustment compensation temperature at the current moment. Based on this, the adjustment temperature at each moment during the non-constant temperature period can be compensated, making the first temperature closer to the target temperature during the non-constant temperature stage. After entering the constant temperature stage, due to the compensation during the non-constant temperature stage, the difference between the target temperature and the first temperature detected at the corresponding moment tends to stabilize, so the adjustment compensation temperature will also stabilize. This allows the target temperature and the first temperature detected at the corresponding moment to be closer at each moment during the constant temperature period, while improving the temperature stability of the oil entering the test fixture 130. It should be noted that "close to the target temperature and the first temperature" here can be understood as the difference between the target temperature and the first temperature being within a preset range. For example, the preset range can be set to 0-1℃ or 0-2℃, etc., as needed.

[0096] Optionally, the main control module 140 includes a first compensation unit 141 and a first calculation unit 142;

[0097] Temperature control methods include:

[0098] The first compensation unit 141 obtains the difference between the target temperature and the detected first temperature at the current moment in the non-constant temperature period and the constant temperature period, and determines the adjustment compensation temperature according to the set first compensation coefficient; wherein, the first compensation coefficient is negatively correlated with the time from the initial temperature at the beginning of the non-constant temperature period to the target temperature at the end of the non-constant temperature period.

[0099] The first calculation unit 142 determines the control temperature based on the target temperature and the control compensation temperature at the current moment.

[0100] Specifically, during the non-constant temperature period and the constant temperature period, there is a deviation between the first temperature and the target temperature. The difference between the first temperature and the target temperature is used as the control target. During the heating process, the temperature control of the oil cooler module 110 can be increased to compensate for the temperature effects caused by ambient temperature and / or pipeline losses, making the first temperature of the oil input to the test fixture 130 closer to the target temperature. During the cooling process, the temperature control of the oil cooler module 110 can be decreased, which is equivalent to decreasing the control temperature, to compensate for the temperature effects caused by ambient temperature and / or pipeline losses, making the first temperature of the oil input to the test fixture 130 closer to the target temperature.

[0101] Combination Figure 7 Taking the heating process as an example, during the non-constant temperature period and the constant temperature period, the first compensation unit 141 obtains the difference between the target temperature and the detected first temperature at the current moment, and uses the first compensation coefficient to proportionally adjust the difference at the current moment to compensate for the temperature influence caused by the ambient temperature and / or pipeline losses, thereby determining the control compensation temperature. The first calculation unit 142 determines the control temperature based on the target temperature and the control compensation temperature at the current moment. For example, the control temperature is determined by adding the target temperature and the control compensation temperature at the current moment. According to the positive or negative relationship between the difference between the target temperature and the first temperature, the control temperature can be increased or decreased. In this embodiment of the invention, the difference between the target temperature and the first temperature is a positive value, which is equivalent to providing positive compensation, increasing the control temperature, and realizing compensation for the control temperature at each moment.

[0102] During the isothermal period, due to compensation during the non-isothermal phase, the difference between the target temperature and the first temperature detected at the corresponding moment tends to stabilize. Therefore, adjusting the compensation temperature also stabilizes, thus ensuring that the target temperature and the first temperature detected at each moment during the isothermal period are close, thereby improving the temperature stability of the oil entering the test fixture 130. Specifically, the first compensation coefficient is negatively correlated with the time from the initial temperature at the beginning of the non-isothermal period to the target temperature at the end of the non-isothermal period; that is, the first compensation coefficient is negatively correlated with the duration of the t1-t2 time period. Figure 7If the temperature regulation of the oil cooler module 110 is not compensated, the actual non-constant temperature period may become longer. In order to shorten the actual non-constant temperature period and make the actual non-constant temperature period closer to the set non-constant temperature period, the first compensation coefficient can be increased to increase the regulation temperature and thus shorten the time for the first temperature to reach the target temperature at the end.

[0103] Based on the above embodiments, optionally, the first calculation unit 142 can determine the control temperature according to the first compensation formula, wherein the first compensation formula is:

[0104] T1n' = T1n + (T1n - T2n) * K1;

[0105] In the formula, T1n' is the control temperature at time n, (T1n-T2n)*K1 is the control compensation temperature at time n, where T1n is the target temperature at time n, T2n is the first temperature at time n, and K1 is the first compensation coefficient.

[0106] Specifically, the difference between the initial temperature and the target temperature at a given moment can be used as the control target. During the heating process, the control temperature of the oil cooler module 110 can be increased to compensate for the temperature effects caused by ambient temperature and / or pipeline losses, making the initial temperature of the oil input to the test fixture 130 closer to the target temperature. During the cooling process, the control temperature of the oil cooler module 110 can be decreased to compensate for the temperature effects caused by ambient temperature and / or pipeline losses, making the initial temperature of the oil input to the test fixture 130 closer to the target temperature. Based on the positive or negative relationship between the target temperature and the initial temperature difference, the control temperature can be increased or decreased, thereby compensating for the control temperature at each moment.

[0107] The first compensation coefficient can be determined during the initial commissioning of the oil bath circulation test equipment. For example, after the test environment of the oil bath circulation test equipment is set up and the external conditions such as environment and pipelines are determined, the target temperatures for non-constant temperature periods and constant temperature periods are set through the main control module 140. The curve of the first temperature changing over time under uncompensated conditions is then tested, combined with... Figure 4 and Figure 5 By fitting data or setting different first compensation coefficients, multiple tests are conducted to select the first compensation coefficient that can make the target temperature during non-constant temperature periods and constant temperature periods close to the first temperature. This first compensation coefficient is then determined as the first compensation coefficient under the current external conditions.

[0108] Optionally, the main control module 140 includes a second compensation unit 143, a third compensation unit 144, and a first calculation unit 142;

[0109] Temperature control methods include:

[0110] The second compensation unit 143 obtains the difference between the target temperature at the current moment and the detected first temperature in the target temperature curve during the non-constant temperature period, and determines the adjustment compensation temperature according to the set second compensation coefficient; wherein, the second compensation coefficient is negatively correlated with the time from the initial temperature at the beginning of the non-constant temperature period to the target temperature at the end of the non-constant temperature period.

[0111] The third compensation unit 144 determines the set value for adjusting the compensation temperature;

[0112] The first calculation unit 142 determines the control temperature based on the target temperature, the control compensation temperature, and the set value control compensation temperature at the current moment.

[0113] Specifically, during non-constant temperature periods and constant temperature periods, the second compensation unit 143 obtains the difference between the target temperature and the detected first temperature at the current moment in the corresponding period, and uses the second compensation coefficient to proportionally adjust the difference at the current moment to compensate for the temperature influence caused by ambient temperature and / or pipeline losses, thereby determining the control compensation temperature.

[0114] Because of the lag in temperature compensation and heat transfer in the pipeline during the entire temperature control compensation process, when the first calculation unit 142 determines the control temperature based solely on the control compensation temperature, it also needs to consider... Figure 7 It can be observed that a slight difference still exists between the target temperature and the compensated first temperature. Further, in this embodiment of the invention, a fixed-value adjustment compensation temperature is provided by the third compensation unit 144 to compensate for this slight difference, so that the first temperature is closer to the target temperature. For example, the fixed-value adjustment compensation temperature can be the difference between the target temperature and the first temperature during the constant-temperature period. Based on the above embodiment, the second compensation coefficient is negatively correlated with the time it takes for the initial temperature at the beginning of the non-constant-temperature period to rise to the target temperature at the end of the non-constant-temperature period. If the temperature control of the oil cooler module 110 is not compensated, the actual non-constant-temperature period may become longer. To shorten the actual non-constant-temperature period and make it closer to the set non-constant-temperature period, the second compensation coefficient can be increased, thereby shortening the time it takes for the first temperature to reach the target temperature at the end.

[0115] Based on the above embodiments, optionally, the first calculation unit 142 can determine the control temperature according to the second compensation formula, wherein the second compensation formula is:

[0116] T1n' = T1n + (T1n - T2n) * K2 + B;

[0117] In the formula, T1n' is the control temperature at time n, (T1n-T2n)*K2 is the control compensation temperature at time n, where T1n is the target temperature at time n, T2n is the first temperature at time n, K2 is the second compensation coefficient, and B is the fixed value control compensation temperature.

[0118] Specifically, the difference between the initial temperature and the target temperature at a given moment can be used as the control target. During the heating process, the control temperature of the oil cooler module 110 can be increased to compensate for the temperature effects caused by ambient temperature and / or pipeline losses, making the initial temperature of the oil input to the test fixture 130 closer to the target temperature. During the cooling process, the control temperature of the oil cooler module 110 can be decreased to compensate for the temperature effects caused by ambient temperature and / or pipeline losses, making the initial temperature of the oil input to the test fixture 130 closer to the target temperature. Based on the positive or negative relationship between the target temperature and the initial temperature difference, the control temperature can be increased or decreased, thereby compensating for the control temperature at each moment.

[0119] The second compensation coefficient can be the same as the first compensation coefficient. For example, the second compensation coefficient can be determined during the initial debugging process of the oil bath circulation test equipment. After the test environment of the oil bath circulation test equipment is set up and the external conditions such as environment and pipelines are determined, the target temperatures for non-constant temperature periods and constant temperature periods are set through the main control module 140. The curve of the first temperature changing over time under uncompensated conditions is tested, combined with... Figure 4 and Figure 5 Figure 7 Figure 4 Figure 5 By performing multiple tests through data fitting or setting different second compensation coefficients, the second compensation coefficient that makes the target temperature during both non-constant temperature periods and constant temperature periods close to the first temperature is selected and determined as the second compensation coefficient under the current external conditions. At this point, the second compensation coefficient can be the same as the first compensation coefficient. Then, the difference between the target temperature and the first temperature during the constant temperature period is taken as the fixed-value control compensation temperature. Since the difference between the target temperature and the first temperature during the constant temperature period is small, it has little impact on the original control temperature during the non-constant temperature periods, so the fixed-value control compensation temperature can be directly used as the compensation value.

[0120] In other embodiments, the second compensation coefficient may also be different from the first compensation coefficient. For example, through the above data processing or testing, a known second compensation coefficient and a fixed-value control compensation temperature can be obtained. Then, the known second compensation coefficient is replaced with an unknown compensation coefficient, and multiple tests are performed again by data fitting or setting different second compensation coefficients. The compensation coefficient that can make the target temperature during non-constant temperature periods and constant temperature periods close to the first temperature is selected as the new second compensation coefficient. At this time, it is equivalent to taking the fixed-value control compensation temperature into account in the compensation formula, fitting a new second compensation coefficient, which can make the difference between the first temperature and the target temperature smaller.

[0121] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An oil bath circulation testing device, characterized in that, include: The oil cooler module is connected to the oil inlet and oil outlet of the test fixture via pipes; A temperature detection module is installed on the oil inlet side of the test fixture to detect the first temperature of the oil input to the oil inlet in real time. The main control module is connected to the temperature detection module. The main control module is used to set the target temperature for non-constant temperature periods and constant temperature periods; wherein, the non-constant temperature periods and the constant temperature periods are continuous periods. The main control module is also used to dynamically determine the adjustment compensation temperature based on the target temperature and the detected first temperature at the current moment during the non-constant temperature period and the constant temperature period, and to determine the adjustment temperature of the oil cooler module based on the target temperature and the adjustment compensation temperature at the current moment.

2. The oil bath circulation testing equipment according to claim 1, characterized in that, The main control module includes a first compensation unit and a first calculation unit; The first compensation unit is used to obtain the difference between the target temperature and the detected first temperature at the current moment in the non-constant temperature period and the constant temperature period, and to determine the adjustment compensation temperature according to the set first compensation coefficient; wherein, the first compensation coefficient is negatively correlated with the time from the initial temperature at the beginning of the non-constant temperature period to the target temperature at the end of the non-constant temperature period. The first calculation unit is used to determine the control temperature based on the target temperature and the control compensation temperature at the current moment.

3. The oil bath circulation testing equipment according to claim 2, characterized in that, The first calculation unit is used to determine the controlled temperature according to a first compensation formula, wherein the first compensation formula is: T1n' = T1n + (T1n - T2n) * K1; In the formula, T1n' is the controlled temperature at time n, (T1n-T2n)*K1 is the controlled compensation temperature at time n, where T1n is the target temperature at time n, T2n is the first temperature at time n, and K1 is the first compensation coefficient.

4. The oil bath circulation testing equipment according to claim 1, characterized in that, The main control module includes a second compensation unit, a third compensation unit, and a first calculation unit; The second compensation unit is used to obtain the difference between the target temperature and the detected first temperature at the current moment in the non-constant temperature period and the constant temperature period, and to determine the adjustment compensation temperature according to the set second compensation coefficient; wherein, the second compensation coefficient is negatively correlated with the time from the initial temperature at the beginning of the non-constant temperature period to the target temperature at the end of the non-constant temperature period. The third compensation unit is used to determine the set value control compensation temperature; The first calculation unit is used to determine the control temperature based on the target temperature at the current time, the control compensation temperature, and the set value control compensation temperature.

5. The oil bath circulation testing equipment according to claim 4, characterized in that, The first calculation unit is used to determine the controlled temperature according to the second compensation formula, wherein the second compensation formula is: T1n' = T1n + (T1n - T2n) * K2 + B; In the formula, T1n' is the controlled temperature at time n, (T1n-T2n)*K2 is the controlled compensation temperature at time n, where T1n is the target temperature at time n, T2n is the first temperature at time n, K2 is the second compensation coefficient, and B is the fixed value controlled compensation temperature.

6. The oil bath circulation testing equipment according to any one of claims 4 or 5, characterized in that, The constant-value control compensation temperature is the difference between the target temperature and the first temperature at the corresponding moment during the constant-temperature period.

7. The oil bath circulation testing equipment according to any one of claims 2-5, characterized in that, The first calculation unit is also used to output the controlled temperature as the upper limit controlled temperature when the controlled temperature is greater than the upper limit controlled temperature of the oil cooler module; The first calculation unit is also used to output the controlled temperature as the lower limit controlled temperature when the controlled temperature is lower than the lower limit controlled temperature of the oil cooler module.

8. A temperature control method for an oil bath circulation testing device, characterized in that, The oil bath circulation test equipment includes: an oil cooler module, a temperature detection module, and a main control module; The temperature control method includes: The temperature detection module detects the first temperature of the oil input to the oil inlet of the test fixture in real time; The main control module sets the target temperatures for non-constant temperature periods and constant temperature periods; wherein, the non-constant temperature periods and the constant temperature periods are continuous periods; The main control module dynamically determines the adjustment compensation temperature based on the target temperature and the detected first temperature at the current moment during the non-constant temperature period and the constant temperature period, and determines the adjustment temperature of the oil cooler module based on the target temperature and the adjustment compensation temperature at the current moment.

9. The temperature control method for the oil bath circulation testing equipment according to claim 8, characterized in that, The main control module includes a first compensation unit and a first calculation unit; The temperature control method includes: The first compensation unit obtains the difference between the target temperature and the detected first temperature at the current moment in the non-constant temperature period and the constant temperature period, and determines the adjustment compensation temperature according to the set first compensation coefficient; wherein, the first compensation coefficient is negatively correlated with the time from the initial temperature at the beginning of the non-constant temperature period to the target temperature at the end of the non-constant temperature period. The first calculation unit determines the control temperature based on the target temperature and the control compensation temperature at the current moment.

10. The temperature control method for the oil bath circulation testing equipment according to claim 8, characterized in that, The main control module includes a second compensation unit, a third compensation unit, and a first calculation unit; The temperature control method includes: The second compensation unit obtains the difference between the target temperature and the detected first temperature at the current moment in the non-constant temperature period and the constant temperature period, and determines the adjustment compensation temperature according to the set second compensation coefficient; wherein, the second compensation coefficient is negatively correlated with the time from the initial temperature at the beginning of the non-constant temperature period to the target temperature at the end of the non-constant temperature period. The third compensation unit determines a set value to regulate the compensation temperature; The first calculation unit determines the control temperature based on the target temperature, the control compensation temperature, and the fixed value control compensation temperature at the current time.

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