Linear temperature control system

Abstract

The invention relates to the field of temperature regulation, in particular to a linear temperature control system. The device contains a working medium, and comprises a refrigeration module used for reducing the temperature of the working medium; the heating module is used for raising the temperature of the working medium; the temperature control module is used for controlling the heating capacity of the heating module and the refrigerating capacity of the refrigerating module to change simultaneously; in the heating process, the output of the refrigeration module is determined according to the output of the heating module; in the cooling process, the output of the heating module is determined according to the output of the refrigerating module; the temperature of the working medium linearly changes in the heating process and the cooling process; and the temperature monitoring module is used for monitoring the temperature of different areas of the system. By controlling the heating capacity and the refrigerating capacity absorbed by the working medium, the temperature change process of the working medium can be accurately controlled, so that the working medium is linearly increased or decreased, and excessive fluctuation in the temperature change process is avoided.

Description

Technical Field

[0001] The invention relates to the field of temperature regulation, and in particular to a linear temperature control system. Background Art

[0002] In the industrial field, temperature is a physical quantity that often needs to be controlled. Many temperature controls are achieved by working media, and the temperature of the working media in the entire area is represented by measuring the temperature of a certain point in the media. In the prior art, the main focus is on how to accurately reach the predetermined temperature. When the target temperature is set, the system outputs high-temperature media at full power to increase the temperature, or outputs low-temperature media at full power to reduce the temperature, until the set target temperature is reached. The intermediate process is uncontrollable. Summary of the invention

[0003] The purpose of the present invention is to solve the above-mentioned related problems and design a linear temperature control system. To achieve the above-mentioned purpose, the present invention provides the following solutions: A linear temperature control system, containing a working medium, includes: A refrigeration module, used to reduce the temperature of the working medium; A heating module, used to increase the temperature of the working medium; The temperature control module is used to control the heating capacity of the heating module and the cooling capacity of the cooling module to change simultaneously; during the heating process, the output of the cooling module is determined according to the output of the heating module; during the cooling process, the output of the heating module is determined according to the output of the cooling module; the temperature of the working medium changes linearly during both the heating process and the cooling process; Temperature monitoring module, used to monitor the temperature of different areas of the system.

[0004] As a further improvement of the technical solution, the refrigeration module includes a condenser, a compressor, a filter, a heat exchanger, an oil separator, pipelines, and valves.

[0005] As a further improvement of the technical solution, the heating module includes an oil tank, a heater, a filter, a pressure sensor, a circulation pump, pipelines, and valves.

[0006] As a further improvement of the technical solution, the temperature control module is used to control the temperature of the heating element according to the set heating target temperature during the heating process. , the heating process 7 is divided into an initial heating stage and a steady heating stage; in the initial heating stage, the temperature control module controls the heating module to output as follows: In the formula, , is the target temperature With current temperature difference; is the set heating rate; The proportional gain coefficient of the temperature control module's output control of the heating module during the initial heating stage; is the heating rate gain coefficient of the temperature control module for controlling the output of the heating module in the initial heating stage; Said is the ratio of the output power of the heating control module to the rated power; During the heating process, the temperature control module controls the cooling target temperature of the refrigeration module. for: In the formula, To correct the target temperature; The temperature control module controls the refrigeration module to output as follows: is the set temperature rise rate; The proportional gain coefficient of the temperature control module's output control of the refrigeration module during the initial heating stage; is the heating rate gain coefficient of the temperature control module's output control of the refrigeration module during the initial heating stage; Said It is the ratio of the output power of the refrigeration module to the rated power of the refrigeration module.

[0007] As a further improvement of the technical solution, in the steady temperature rise stage, the temperature control module controls the heating module to output as follows: In the formula, , is the target temperature With current temperature difference; The proportional gain coefficient of the temperature control module's output control of the heating module during the steady temperature rise stage; The integral gain coefficient of the temperature control module's output control of the heating module during the steady temperature rise stage; The differential gain coefficient of the temperature control module's output control of the heating module during the steady temperature rise stage; The gain coefficient of the heating rate of the temperature control module for controlling the output of the heating module during the steady heating stage; is the actual heating rate in the steady heating stage; is the set heating rate; In the steady temperature rise stage, the temperature control module controls the refrigeration module to output as follows: In the formula, , is the target temperature With current temperature difference; The proportional gain coefficient of the temperature control module's output control over the refrigeration module during the steady temperature rise stage; The integral gain coefficient of the temperature control module's output control over the refrigeration module during the steady temperature rise stage; The differential gain coefficient of the temperature control module's output control of the refrigeration module during the steady temperature rise stage; The gain coefficient of the heating rate of the temperature control module for controlling the output of the refrigeration module during the steady heating stage; is the actual heating rate in the steady heating stage; is the set heating rate.

[0008] As a further improvement of the technical solution, the gain of the cooling module is determined by the gain of the heating module. In the initial heating stage, the relationship between the two is: In the formula, The proportional gain coefficient of the temperature control module's output control of the refrigeration module during the initial heating stage; is the heating rate gain coefficient of the temperature control module's output control of the refrigeration module during the initial heating stage; The proportional gain coefficient of the temperature control module's output control of the heating module during the initial heating stage; is the heating rate gain coefficient of the temperature control module for controlling the output of the heating module in the initial heating stage; In the steady temperature rise stage, the relationship between the two is: In the formula, The proportional gain coefficient of the temperature control module's output control over the refrigeration module during the steady temperature rise stage; The integral gain coefficient of the temperature control module's output control over the refrigeration module during the steady temperature rise stage; The differential gain coefficient of the temperature control module's output control of the refrigeration module during the steady temperature rise stage; The gain coefficient of the heating rate of the temperature control module for controlling the output of the refrigeration module during the steady heating stage; The proportional gain coefficient of the temperature control module's output control of the heating module during the steady temperature rise stage; The integral gain coefficient of the temperature control module's output control of the heating module during the steady temperature rise stage; The differential gain coefficient of the temperature control module's output control of the heating module during the steady temperature rise stage; It is the heating rate gain coefficient of the temperature control module's output control of the heating module during the steady heating stage.

[0009] As a further improvement of the technical solution, the temperature control module adjusts the temperature according to the set cooling target temperature during the cooling process. , the cooling process is divided into an initial cooling stage and a steady cooling stage; in the initial cooling stage, the temperature control module controls the refrigeration module to output as follows: In the formula, , is the target temperature With current temperature difference; is the set cooling rate; The proportional gain coefficient of the temperature control module's output control of the refrigeration module during the initial cooling stage; is the cooling rate gain coefficient of the temperature control module output control of the refrigeration module in the initial cooling stage; Said is the ratio of the output power of the refrigeration control module to the rated power; During the cooling process, the temperature control module controls the heating module to reach the target temperature. for: In the formula, To correct the target temperature; The temperature control module controls the heating module to output as follows: is the set cooling rate; The proportional gain coefficient of the temperature control module's output control of the heating module during the initial cooling stage; is the cooling rate gain coefficient of the temperature control module's output control of the heating module in the initial cooling stage; Said It is the ratio of the output power of the heating module to the rated power of the heating module.

[0010] As a further improvement of the technical solution, in the steady temperature reduction stage, the temperature control module controls the refrigeration module to output as follows: In the formula, , is the target temperature With current temperature difference; The proportional gain coefficient of the temperature control module's output control of the refrigeration module during the steady cooling stage; The integral gain coefficient of the temperature control module's output control of the refrigeration module during the steady cooling stage; The differential gain coefficient of the temperature control module's output control of the refrigeration module during the steady cooling stage; The cooling rate gain coefficient of the temperature control module outputting control to the refrigeration module during the steady cooling stage; is the actual cooling rate in the stable cooling stage; is the set cooling rate; In the steady cooling stage, the temperature control module controls the heating module to output as follows: In the formula, , is the target temperature With current temperature difference; The proportional gain coefficient of the temperature control module's output control of the heating module during the steady cooling stage; The integral gain coefficient of the temperature control module's output control of the heating module during the steady cooling stage; The differential gain coefficient of the temperature control module's output control of the heating module during the steady cooling stage; The cooling rate gain coefficient of the temperature control module output control of the heating module during the stable cooling stage; is the actual cooling rate in the stable cooling stage; is the set cooling rate.

[0011] As a further improvement of the technical solution, the gain of the heating module is determined by the gain of the cooling module. In the initial cooling stage, the relationship between the two is: In the formula, The proportional gain coefficient of the temperature control module's output control of the heating module during the initial cooling stage; is the cooling rate gain coefficient of the temperature control module's output control of the heating module in the initial cooling stage; The proportional gain coefficient of the temperature control module's output control of the refrigeration module during the initial cooling stage; is the cooling rate gain coefficient of the temperature control module output control of the refrigeration module in the initial cooling stage; In the stable cooling stage, the relationship between the two is: In the formula, The proportional gain coefficient of the temperature control module's output control of the heating module during the steady cooling stage; The integral gain coefficient of the temperature control module's output control of the heating module during the steady cooling stage; The differential gain coefficient of the temperature control module's output control of the heating module during the steady cooling stage; The cooling rate gain coefficient of the temperature control module output control of the heating module during the stable cooling stage; The proportional gain coefficient of the temperature control module's output control of the refrigeration module during the steady cooling stage; The integral gain coefficient of the temperature control module's output control of the refrigeration module during the steady cooling stage; The differential gain coefficient of the temperature control module's output control of the refrigeration module during the steady cooling stage; It is the cooling rate gain coefficient of the temperature control module output control of the refrigeration module during the stable cooling stage.

[0012] As a further improvement of the present technical solution, after the temperature of the working medium reaches the target temperature, the temperature control module controls the outputs of the heating module and the cooling module to keep the working medium at the target temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Various other advantages and benefits will become apparent to those skilled in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention; Figure 1 It is a structural schematic diagram of a linear temperature control system of the present invention. DETAILED DESCRIPTION

[0014] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0015] Those skilled in the art will appreciate that, unless otherwise stated, the singular forms "a", "an" and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of the present invention refers to the presence of the features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof.

[0016] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0017] Example 1 like Figure 1 As shown, a schematic diagram of the structure of a linear temperature control system.

[0018] Before the heating phase begins, the working medium is at a constant temperature. At this time, the working medium absorbs heat from the heating module and cooling capacity from the cooling module at the same time, but the temperature of the working medium remains unchanged. The heating module includes an oil tank, a heater, a filter, a pressure sensor, a circulating pump, pipes, and valves. The cooling module includes a condenser, a compressor, a filter, a heat exchanger, an oil separator, pipes, and valves.

[0019] Select the working medium heating in the system, and enter the heating target temperature, heating rate and initial stage heating temperature. The target temperature is the temperature you want the working medium to reach. The heating rate is the temperature of the working medium per unit time, generally in ℃ / min.

[0020] Since the temperature change has a hysteresis, the entire heating process needs to be divided into the initial heating stage and the steady heating stage. The temperature rise in the initial heating stage accounts for 10% to 15% of the total temperature rise.

[0021] After entering the initial heating stage, the temperature control module controls the heating module to output as follows: In the formula, , is the target temperature With current temperature difference; is the set heating rate; The proportional gain coefficient of the temperature control module's output control of the heating module in the initial heating stage, with a setting range of 0.001 to 0.005; is the heating rate gain coefficient of the temperature control module for controlling the output of the heating module in the initial heating stage, and the setting range is 0.05 to 0.3; First calculate The value of is compared with 0, the larger one is taken, and the result is compared with 1, the smaller one is taken. This value is a number greater than or equal to 0 but less than or equal to 1, that is, a percentage. This percentage is the ratio of the heating module output power to the rated power, which is the rated power of the heating module multiplied by , and obtain the actual power output of the heating module controlled by the temperature control module.

[0022] While the heating module increases its output, the cooling module continuously reduces its output. According to the heating target temperature, the temperature control module controls the cooling target temperature of the cooling module to: In the formula, To correct the target temperature, the value is 1~3℃, that is, the cooling target temperature is higher than the heating target temperature; In the initial heating stage, the temperature control module controls the cooling module to output as follows: is the set temperature rise rate; The proportional gain coefficient of the temperature control module's output control of the refrigeration module during the initial heating stage; It is the heating rate gain coefficient of the temperature control module's output control of the refrigeration module in the initial heating stage.

[0023] In the initial heating stage, the output of the cooling module decreases continuously, and its gain is determined by the gain of the heating module. The relationship between the two is: In the formula, The proportional gain coefficient of the temperature control module's output control of the refrigeration module during the initial heating stage; is the heating rate gain coefficient of the temperature control module's output control of the refrigeration module during the initial heating stage; The proportional gain coefficient of the temperature control module's output control of the heating module during the initial heating stage; is the heating rate gain coefficient of the temperature control module for controlling the output of the heating module in the initial heating stage; The proportional gain coefficient of the temperature control module's output control of the heating module in the initial heating stage and the heating rate gain coefficient of the temperature control module for controlling the output of the heating module in the initial heating stage After the determination, the proportional gain coefficient of the temperature control module's output control of the refrigeration module in the initial heating stage can be calculated. and the heating rate gain coefficient of the temperature control module for controlling the output of the refrigeration module in the initial heating stage .

[0024] The calculated value is also a percentage, which is multiplied by the rated power of the refrigeration module to obtain the actual output power of the refrigeration module. As the temperature rises, the output power of the refrigeration module continues to decrease, but it is not suddenly shut down. Therefore, the working medium temperature can be suppressed from suddenly rising uncontrollably under the action of the heating module, but increases linearly under a controlled state.

[0025] After the temperature increases to the set temperature in the initial heating stage, it enters the steady heating stage. In the steady heating stage, the temperature control module controls the heating module to output as follows: In the formula, , is the target temperature With current temperature difference; The proportional gain coefficient of the temperature control module's output control of the heating module during the steady temperature rise stage; The integral gain coefficient of the temperature control module's output control of the heating module during the steady temperature rise stage; The differential gain coefficient of the temperature control module's output control of the heating module during the steady temperature rise stage; The gain coefficient of the heating rate of the temperature control module for controlling the output of the heating module during the steady heating stage; is the actual heating rate in the steady heating stage; is the set heating rate; First calculate the target temperature With current temperature difference go through The controlled value is then corrected for the difference between the actual heating rate and the set heating rate. The calculated value is compared with 0, and the larger value is compared with 1 to obtain , the value is a number greater than or equal to 0 but less than or equal to 1, that is, a percentage. The percentage is multiplied by the rated power of the heating module to obtain the actual power output of the heating module controlled by the temperature control module.

[0026] While the heating module increases its output, the cooling module's output continues to decrease. Its gain is determined by the heating module's gain. The relationship between the two is: In the formula, The proportional gain coefficient of the temperature control module's output control over the refrigeration module during the steady temperature rise stage; The integral gain coefficient of the temperature control module's output control over the refrigeration module during the steady temperature rise stage; The differential gain coefficient of the temperature control module's output control of the refrigeration module during the steady temperature rise stage; The gain coefficient of the heating rate of the temperature control module for controlling the output of the refrigeration module during the steady heating stage; The proportional gain coefficient of the temperature control module's output control of the heating module during the steady temperature rise stage; The integral gain coefficient of the temperature control module's output control of the heating module during the steady temperature rise stage; The differential gain coefficient of the temperature control module's output control of the heating module during the steady temperature rise stage; It is the heating rate gain coefficient of the temperature control module's output control of the heating module during the steady heating stage.

[0027] During the steady temperature rise phase, the temperature control module controls the refrigeration module to output as follows: In the formula, , is the target temperature With current temperature difference; The proportional gain coefficient of the temperature control module's output control over the refrigeration module during the steady temperature rise stage; The integral gain coefficient of the temperature control module's output control over the refrigeration module during the steady temperature rise stage; The differential gain coefficient of the temperature control module's output control of the refrigeration module during the steady temperature rise stage; The gain coefficient of the heating rate of the temperature control module for controlling the output of the refrigeration module during the steady heating stage; is the actual heating rate in the steady heating stage; is the set heating rate.

[0028] The calculated value is also a percentage, which is multiplied by the rated power of the refrigeration module to obtain the actual output power of the refrigeration module. As the temperature rises, the output power of the refrigeration module continues to decrease, but it is not suddenly shut down. Therefore, the working medium temperature can be suppressed from suddenly rising uncontrollably under the input of the heating module, but increases linearly under a controlled state.

[0029] Since the target temperature of the cooling module is higher than the target temperature of the heating module, the cooling module will not stop outputting when the target temperature is reached during the entire heating process. The working medium temperature goes through a steady heating stage, and the temperature increases linearly to reach the target temperature.

[0030] The heating source and the cooling source adjust their outputs so that the working medium absorbs heat from the heating source and cooling capacity from the cooling source at the same time. However, the heating amount and cooling capacity absorbed by the working medium remain the same, and the temperature of the working medium remains unchanged, maintaining a constant temperature state.

[0031] Example 2 like Figure 1 As shown, a schematic diagram of the structure of a linear temperature control system.

[0032] Before the cooling phase begins, the working medium is at a constant temperature. At this time, the working medium absorbs heat from the heating module and cooling capacity from the cooling module at the same time, but the temperature of the working medium remains unchanged. The cooling module includes a condenser, a compressor, a filter, a heat exchanger, an oil separator, pipes, and valves. The heating module includes an oil tank, a heater, a filter, a pressure sensor, a circulating pump, pipes, and valves.

[0033] Select the working medium cooling in the system, and input the cooling target temperature, cooling rate and initial stage cooling temperature. The target temperature is the temperature you want the working medium to reach. The cooling rate is the temperature of the working medium lowered per unit time, generally in ℃ / min.

[0034] Since the temperature change has a hysteresis, the entire cooling process needs to be divided into the initial cooling stage and the steady cooling stage. The temperature reduction in the initial cooling stage accounts for 10%~15% of the total temperature reduction.

[0035] After entering the initial cooling stage, the temperature control module controls the refrigeration module to output as follows: In the formula, , is the target temperature With current temperature difference; is the set cooling rate; The proportional gain coefficient of the temperature control module's output control of the refrigeration module in the initial cooling stage, with a setting range of 0.001 to 0.005; is the cooling rate gain coefficient of the temperature control module for controlling the output of the refrigeration module in the initial cooling stage, and the setting range is 0.05 to 0.3; First calculate The value of is compared with 0, the larger one is taken, and the result is compared with 1, the smaller one is taken. This value is a number greater than or equal to 0 but less than or equal to 1, that is, a percentage. The percentage is the ratio of the cooling module output power to the rated power. The cooling module rated power is multiplied by , and obtain the actual power output of the refrigeration module controlled by the temperature control module.

[0036] While the cooling module increases its output, the heating module continuously reduces its output. According to the cooling target temperature, the temperature control module controls the cooling target temperature of the heating module to be: In the formula, To correct the target temperature, the value is 1~3℃, that is, the cooling target temperature is higher than the heating target temperature; In the initial cooling stage, the temperature control module controls the heating module to output as follows: is the set cooling rate; The proportional gain coefficient of the temperature control module's output control of the heating module during the initial cooling stage; is the cooling rate gain coefficient of the temperature control module's output control of the heating module in the initial cooling stage; Said It is the ratio of the output power of the heating module to the rated power of the heating module.

[0037] In the initial cooling stage, the output of the heating module decreases continuously, and its gain is determined by the gain of the cooling module. The relationship between the two is: In the formula, The proportional gain coefficient of the temperature control module's output control of the heating module during the initial cooling stage; is the cooling rate gain coefficient of the temperature control module's output control of the heating module in the initial cooling stage; The proportional gain coefficient of the temperature control module's output control of the refrigeration module during the initial cooling stage; It is the cooling rate gain coefficient of the temperature control module's output control of the refrigeration module in the initial cooling stage.

[0038] The proportional gain coefficient of the temperature control module's output control of the refrigeration module in the initial cooling stage and the cooling rate gain coefficient of the temperature control module for controlling the output of the refrigeration module in the initial cooling stage After determination, the proportional gain coefficient of the temperature control module's output control of the heating module in the initial cooling stage can be calculated. and the cooling rate gain coefficient of the temperature control module for controlling the output of the heating module in the initial cooling stage . The calculated value is also a percentage, which is multiplied by the rated power of the heating module to obtain the actual output power of the heating module. As the temperature decreases, the output power of the heating module continues to decrease, but it is not shut down suddenly. Therefore, the working medium temperature can be suppressed from suddenly decreasing uncontrollably under the action of the cooling module, but decreases linearly under a controlled state.

[0039] After the temperature drops to the set temperature in the initial cooling stage, it enters the steady cooling stage. In the steady cooling stage, the temperature control module controls the refrigeration module to output as follows: In the formula, , is the target temperature With current temperature difference; The proportional gain coefficient of the temperature control module's output control of the refrigeration module during the steady cooling stage; The integral gain coefficient of the temperature control module's output control of the refrigeration module during the steady cooling stage; The differential gain coefficient of the temperature control module's output control of the refrigeration module during the steady cooling stage; The cooling rate gain coefficient of the temperature control module outputting control to the refrigeration module during the steady cooling stage; is the actual cooling rate in the stable cooling stage; is the set cooling rate.

[0040] First calculate the target temperature With current temperature difference go through The controlled value is then corrected for the difference between the actual cooling rate and the set cooling rate. The calculated value is compared with 0, and the larger value is compared with 1 to obtain , the value is a number greater than or equal to 0 but less than or equal to 1, that is, a percentage. The percentage is multiplied by the rated power of the refrigeration module to obtain the actual power output of the refrigeration module controlled by the temperature control module.

[0041] As the cooling module increases its output, the heating module's output continues to decrease. Its gain is determined by the cooling module's gain. The relationship between the two is: In the formula, The proportional gain coefficient of the temperature control module's output control of the heating module during the steady cooling stage; The integral gain coefficient of the temperature control module's output control of the heating module during the steady cooling stage; The differential gain coefficient of the temperature control module's output control of the heating module during the steady cooling stage; The cooling rate gain coefficient of the temperature control module output control of the heating module during the stable cooling stage; The proportional gain coefficient of the temperature control module's output control of the refrigeration module during the steady cooling stage; The integral gain coefficient of the temperature control module's output control of the refrigeration module during the steady cooling stage; The differential gain coefficient of the temperature control module's output control of the refrigeration module during the steady cooling stage; It is the cooling rate gain coefficient of the temperature control module output control of the refrigeration module during the stable cooling stage.

[0042] During the steady cooling stage, the temperature control module controls the heating module to output as follows: In the formula, , is the target temperature With current temperature difference; The proportional gain coefficient of the temperature control module's output control of the heating module during the steady cooling stage; The integral gain coefficient of the temperature control module's output control of the heating module during the steady cooling stage; The differential gain coefficient of the temperature control module's output control of the heating module during the steady cooling stage; The cooling rate gain coefficient of the temperature control module output control of the heating module during the stable cooling stage; is the actual cooling rate in the stable cooling stage; is the set cooling rate.

[0043] The calculated value is also a percentage, which is multiplied by the rated power of the heating module to obtain the actual output power of the heating module. As the temperature drops, the output power of the heating module continues to decrease, but it is not suddenly shut down. Therefore, the working medium temperature can be suppressed from suddenly rising uncontrollably under the input of the cooling module, but increases linearly under a controlled state.

[0044] Since the target temperature of the heating module is higher than the target temperature of the cooling module, the heating module will not stop outputting when the target temperature is reached during the entire cooling process. The working medium temperature goes through a steady cooling stage, and the temperature drops linearly to reach the target temperature.

[0045] The heating source and the cooling source adjust their outputs so that the working medium absorbs heat from the heating source and cooling capacity from the cooling source at the same time. However, the heating amount and cooling capacity absorbed by the working medium remain the same, and the temperature of the working medium remains unchanged, maintaining a constant temperature state.

[0046] In summary, the linear temperature control system proposed in the present invention can accurately control the temperature change process of the working medium by controlling the heating and cooling capacity absorbed by the working medium, so that it can increase or decrease linearly and avoid excessive fluctuations in the temperature change process.

Claims

1. A linear temperature control system, containing a working medium, characterized in that: include: A refrigeration module, used to reduce the temperature of the working medium; A heating module, used to increase the temperature of the working medium; The temperature control module is used to control the heating capacity of the heating module and the cooling capacity of the cooling module to change simultaneously; during the heating process, the output of the cooling module is determined according to the output of the heating module; during the cooling process, the output of the heating module is determined according to the output of the cooling module; the temperature of the working medium changes linearly during both the heating process and the cooling process; Temperature monitoring module, used to monitor the temperature of different areas of the system.

2. A linear temperature control system according to claim 1, characterized in that: The refrigeration module includes a condenser, a compressor, a filter, a heat exchanger, an oil separator, pipelines, and valves.

3. A linear temperature control system according to claim 1, characterized in that: The heating module includes an oil tank, a heater, a filter, a pressure sensor, a circulation pump, pipelines, and valves.

4. A linear temperature control system according to claim 1, characterized in that: The temperature control module is set to the target temperature during the heating process. , the heating process is divided into an initial heating stage and a steady heating stage; in the initial heating stage, the temperature control module controls the heating module to output as follows: In the formula, , is the target temperature With current temperature difference; is the set heating rate; The proportional gain coefficient of the temperature control module's output control of the heating module during the initial heating stage; is the heating rate gain coefficient of the temperature control module for controlling the output of the heating module in the initial heating stage; During the heating process, the temperature control module controls the cooling target temperature of the refrigeration module. for: In the formula, To correct the target temperature; The temperature control module controls the refrigeration module to output as follows: is the set temperature rise rate; The proportional gain coefficient of the temperature control module's output control of the refrigeration module during the initial heating stage; It is the heating rate gain coefficient of the temperature control module's output control of the refrigeration module in the initial heating stage.

5. A linear temperature control system according to claim 4, characterized in that: In the steady temperature rise stage, the temperature control module controls the heating module to output as follows: In the formula, , is the target temperature With current temperature difference; The proportional gain coefficient of the temperature control module's output control of the heating module during the steady temperature rise stage; The integral gain coefficient of the temperature control module's output control of the heating module during the steady temperature rise stage; The differential gain coefficient of the temperature control module's output control of the heating module during the steady temperature rise stage; The gain coefficient of the heating rate of the temperature control module for controlling the output of the heating module during the steady heating stage; is the actual heating rate in the steady heating stage; is the set heating rate; In the steady temperature rise stage, the temperature control module controls the refrigeration module to output as follows: In the formula, , is the target temperature With current temperature difference; The proportional gain coefficient of the temperature control module's output control over the refrigeration module during the steady temperature rise stage; The integral gain coefficient of the temperature control module's output control over the refrigeration module during the steady temperature rise stage; The differential gain coefficient of the temperature control module's output control of the refrigeration module during the steady temperature rise stage; The gain coefficient of the heating rate of the temperature control module for controlling the output of the refrigeration module during the steady heating stage; is the actual heating rate in the steady heating stage; is the set heating rate.

6. A linear temperature control system according to claim 5, characterized in that: The gain of the cooling module is determined by the gain of the heating module. In the initial heating stage, the relationship between the two is: In the formula, The proportional gain coefficient of the temperature control module's output control of the refrigeration module during the initial heating stage; is the heating rate gain coefficient of the temperature control module's output control of the refrigeration module during the initial heating stage; The proportional gain coefficient of the temperature control module's output control of the heating module during the initial heating stage; is the heating rate gain coefficient of the temperature control module for controlling the output of the heating module in the initial heating stage; In the steady temperature rise stage, the relationship between the two is: In the formula, The proportional gain coefficient of the temperature control module's output control over the refrigeration module during the steady temperature rise stage; The integral gain coefficient of the temperature control module's output control over the refrigeration module during the steady temperature rise stage; The differential gain coefficient of the temperature control module's output control of the refrigeration module during the steady temperature rise stage; The gain coefficient of the heating rate of the temperature control module for controlling the output of the refrigeration module during the steady heating stage; The proportional gain coefficient of the temperature control module's output control of the heating module during the steady temperature rise stage; The integral gain coefficient of the temperature control module's output control of the heating module during the steady temperature rise stage; The differential gain coefficient of the temperature control module's output control of the heating module during the steady temperature rise stage; It is the heating rate gain coefficient of the temperature control module's output control of the heating module during the steady heating stage.

7. A linear temperature control system according to claim 1, characterized in that: The temperature control module is used to control the temperature during the cooling process according to the set cooling target temperature. , the cooling process is divided into an initial cooling stage and a steady cooling stage; in the initial cooling stage, the temperature control module controls the refrigeration module to output as follows: In the formula, , is the target temperature With current temperature difference; is the set cooling rate; The proportional gain coefficient of the temperature control module's output control of the refrigeration module during the initial cooling stage; is the cooling rate gain coefficient of the temperature control module output control of the refrigeration module in the initial cooling stage; During the cooling process, the temperature control module controls the heating module to reach the target temperature. for: In the formula, To correct the target temperature; The temperature control module controls the heating module to output as follows: is the set cooling rate; The proportional gain coefficient of the temperature control module's output control of the heating module during the initial cooling stage; It is the cooling rate gain coefficient of the temperature control module's output control of the heating module in the initial cooling stage.

8. A linear temperature control system according to claim 7, characterized in that: In the steady cooling stage, the temperature control module controls the refrigeration module to output as follows: In the formula, , is the target temperature With current temperature difference; The proportional gain coefficient of the temperature control module's output control of the refrigeration module during the steady cooling stage; The integral gain coefficient of the temperature control module's output control of the refrigeration module during the steady cooling stage; The differential gain coefficient of the temperature control module's output control of the refrigeration module during the steady cooling stage; The cooling rate gain coefficient of the temperature control module outputting control to the refrigeration module during the steady cooling stage; is the actual cooling rate in the stable cooling stage; is the set cooling rate; In the steady cooling stage, the temperature control module controls the heating module to output as follows: In the formula, , is the target temperature With current temperature difference; The proportional gain coefficient of the temperature control module's output control of the heating module during the steady cooling stage; The integral gain coefficient of the temperature control module's output control of the heating module during the steady cooling stage; The differential gain coefficient of the temperature control module's output control of the heating module during the steady cooling stage; The cooling rate gain coefficient of the temperature control module for controlling the output of the heating module during the steady cooling stage; is the actual cooling rate in the stable cooling stage; is the set cooling rate.

9. A linear temperature control system according to claim 8, characterized in that: The gain of the heating module is determined by the gain of the cooling module. In the initial cooling stage, the relationship between the two is: In the formula, The proportional gain coefficient of the temperature control module's output control of the heating module during the initial cooling stage; is the cooling rate gain coefficient of the temperature control module's output control of the heating module in the initial cooling stage; The proportional gain coefficient of the temperature control module's output control of the refrigeration module during the initial cooling stage; is the cooling rate gain coefficient of the temperature control module output control of the refrigeration module in the initial cooling stage; In the stable cooling stage, the relationship between the two is: In the formula, The proportional gain coefficient of the temperature control module's output control of the heating module during the steady cooling stage; The integral gain coefficient of the temperature control module's output control of the heating module during the steady cooling stage; The differential gain coefficient of the temperature control module's output control of the heating module during the steady cooling stage; The cooling rate gain coefficient of the temperature control module for controlling the output of the heating module during the steady cooling stage; The proportional gain coefficient of the temperature control module's output control of the refrigeration module during the steady cooling stage; The integral gain coefficient of the temperature control module's output control of the refrigeration module during the steady cooling stage; The differential gain coefficient of the temperature control module's output control of the refrigeration module during the steady cooling stage; It is the cooling rate gain coefficient of the temperature control module output control of the refrigeration module during the stable cooling stage.

10. A linear temperature control system according to claim 1, characterized in that: After the temperature of the working medium reaches the target temperature, the temperature control module controls the outputs of the heating module and the cooling module to keep the working medium at the target temperature.

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