Temperature control method and system for variable air supply flow refrigeration assembly

Abstract

The invention belongs to the field of large aircraft environment control, and particularly relates to a variable air supply flow refrigeration assembly temperature control method and system which comprises a controller and a refrigeration assembly. The controller is used for controlling the state of the temperature control valve; the refrigeration assembly comprises a radiator, a turbine, a condenser, a water separator and a temperature control valve; the temperature control valve is connected with the controller, a refrigeration assembly outlet is formed in the temperature control valve in an output mode, one end of the radiator is connected with the temperature control valve through a guide pipe, the other end of the radiator is connected with the condenser through a guide pipe, the condenser and the water separator are connected through a guide pipe, the condenser and the water separator are connected with the turbine, and the fan is connected to the turbine. By adopting an intelligent strategy of'first identification and second control ', an original passive and fragile open-loop / weak closed-loop temperature control system is upgraded into an active and robust closed-loop self-adaptive control system.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of large aircraft environmental control, and particularly relates to a variable supply air flow refrigeration assembly temperature control method and system. BACKGROUND

[0002] The aircraft refrigeration assembly draws air from the engine, and a flow control valve is usually arranged at the inlet of the refrigeration assembly to adjust the flow entering the refrigeration assembly, so as to control the supply air flow of the refrigeration assembly to be a stable constant. However, the state change of the engine will cause large-scale changes in the temperature and pressure of the drawn air, which will exceed the adjustment range of the flow control valve, so that the supply air flow fluctuates in a large range. The fluctuation of the supply air flow greatly interferes with the stable control of the outlet temperature of the refrigeration assembly.

[0003] Therefore, how to prevent the fluctuation of the supply air flow is a problem to be solved. SUMMARY

[0004] In order to solve the above problems, the present application provides a variable supply air flow refrigeration assembly temperature control method and system to solve the problem that the fluctuation of the supply air flow in the prior art greatly interferes with the stable control of the outlet temperature of the refrigeration assembly.

[0005] The technical scheme of the present application is: a variable supply air flow refrigeration assembly temperature control method, comprising:

[0006] The controller sets the temperature control valve to the fully open position;

[0007] The controller sets the supply air flow to normal, starts the refrigeration assembly, and after the system is stable, increases the supply air flow to the maximum. The change data of the outlet temperature of the refrigeration assembly in the first time is recorded to determine the flow disturbance period of the outlet temperature of the refrigeration assembly;

[0008] The supply air flow is restored to normal, and after the system is stable, the temperature control valve is controlled to move from the fully open position to the closed position in the control period. If the outlet temperature of the refrigeration assembly exceeds the temperature during the movement of the valve, the temperature control valve is controlled to the fully open position again;

[0009] During the movement of the temperature control valve, the change of the outlet temperature of the refrigeration assembly in the first time is recorded, one period with the most obvious change of the outlet temperature of the refrigeration assembly is analyzed, and the movement control period of the temperature control valve is determined;

[0010] The maximum value of the flow disturbance period and the movement control period is taken as the control period of the temperature control valve, and a control algorithm is designed.

[0011] Preferably, the time from the minimum change to 80% of the maximum change of the outlet temperature of the refrigeration assembly is determined as the flow disturbance period.

[0012] Preferably, the time it takes for the outlet temperature of the refrigeration component to change from its minimum to 80% of its maximum is determined as the operating control cycle of the temperature control valve.

[0013] Preferably, the first time is 2 minutes, the control cycle is 2 minutes, and the output is 400 ms in each control cycle.

[0014] Preferably, the method for determining system stability is: the gas supply flow rate fluctuation within a set time is less than a set value.

[0015] Preferably, the controller outputs a 28V / PWM temperature control valve to the fully open position.

[0016] As another specific implementation, a temperature control system for a variable gas flow refrigeration component includes a controller and a refrigeration component; the controller is used to control the state of the temperature control valve.

[0017] The refrigeration assembly includes a radiator, a turbine, a condenser, a water separator, and a temperature control valve. The temperature control valve is connected to a controller and has an outlet for the refrigeration assembly. One end of the radiator is connected to the temperature control valve via a conduit, and the other end is connected to the condenser via a conduit. The condenser and the water separator are connected via a conduit, and the condenser and the water separator are connected to the turbine. A fan is connected to the turbine.

[0018] Preferably, the temperature control valve is a butterfly valve or a ball valve driven by a 28V / PWM duty cycle signal.

[0019] Preferably, an outlet temperature sensor is provided on the outlet of the refrigeration component, and the controller can collect the outlet temperature of the refrigeration component through the outlet temperature sensor.

[0020] Preferably, in the controller, the time it takes for the outlet temperature of the refrigeration component to change from a minimum to 80% of its maximum is defined as the flow disturbance period.

[0021] Preferably, in the controller, the time it takes for the outlet temperature of the refrigeration component to change from a minimum to 80% of its maximum is determined as the operating control cycle of the temperature control valve.

[0022] Preferably, the controller determines system stability by determining that the gas supply flow rate fluctuation is less than a set value within a set time period.

[0023] The variable gas flow rate refrigeration component temperature control method and system of this application have the following advantages:

[0024] By adopting an intelligent strategy of "identification first, control later," a previously passive and fragile open-loop / weak closed-loop temperature control system has been upgraded into an active and robust closed-loop adaptive control system. This not only overcomes the persistent problem of gas flow fluctuations interfering with temperature control, but also brings systematic and cascading positive effects in improving control quality, enhancing system robustness, and simplifying engineering design.

[0025] The sensitivity of the entire temperature control system to disturbances at the bleed air end is greatly reduced, and "maintaining a constant inlet flow rate" is no longer a prerequisite. Therefore, temperature control valves with smaller adjustment ranges, lower costs, and higher reliability can be selected, or upstream systems can be allowed to operate within a wider range, thereby reducing the design complexity and manufacturing cost of the entire aircraft environmental control system.

[0026] By identifying the dynamic characteristics of the controlled object online and adaptively setting control parameters, the problem of controlling the outlet temperature of the refrigeration component caused by engine bleed air fluctuations is effectively solved, and effective temperature control by a single valve is achieved. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of this application;

[0028] Figure 2 This is a schematic diagram showing the outlet temperature change of the refrigeration component of this application when the gas supply flow is normal.

[0029] Figure 3 This is a schematic diagram of the outlet temperature change of the refrigeration component in this application during the control of the valve operation.

[0030] 1. Controller; 2. Radiator; 3. Turbine; 4. Fan; 5. Condenser; 6. Water separator; 7. Temperature control valve. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are only some, not all, of the embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0032] The first aspect of this application provides a temperature control system for a variable gas flow refrigeration component, such as... Figure 1 It includes controller 1 and refrigeration components.

[0033] Controller 1 is used to control the state of temperature control valve 7.

[0034] The refrigeration assembly includes a radiator 2, a turbine 3, a condenser 5, a water separator 6, and a temperature control valve 7. The temperature control valve 7 is connected to a controller 1, and the controller 1 valve is connected to the bleed air system. The temperature control valve 7 has an outlet for the refrigeration assembly. One end of the radiator 2 is connected to the temperature control valve 7 via a conduit, and the other end is connected to the condenser 5 via a conduit. The condenser 5 and the water separator 6 are connected via a conduit. The condenser 5 and the water separator 6 are connected to the turbine 3, and a fan 4 is connected to the turbine 3.

[0035] Temperature control valve 7 is a butterfly valve or ball valve driven by a 28V / PWM duty cycle signal.

[0036] An outlet temperature sensor is installed at the outlet of the refrigeration component, and the controller 1 can collect the outlet temperature of the refrigeration component through the outlet temperature sensor.

[0037] Controller 1 controls the refrigeration unit based on the outlet temperature of the refrigeration unit.

[0038] In controller 1, the time it takes for the outlet temperature of the refrigeration unit to change from its minimum to 80% of its maximum is defined as the flow disturbance cycle. The time it takes for the outlet temperature of the refrigeration unit to change from its minimum to 80% of its maximum is defined as the operation control cycle of the temperature control valve 7.

[0039] The method for controller 1 to determine system stability is: the gas supply flow rate fluctuation within a set time is less than the set value, and the set value is set based on experience.

[0040] As another specific implementation, a method for temperature control of a variable gas flow refrigeration component includes:

[0041] The first step is that the controller 1 outputs a 28V / PWM temperature control valve 7 to the fully open position (the air supply only passes through the radiator 2).

[0042] The second step is to set the gas supply flow rate to normal, start the refrigeration component, and increase the gas supply flow rate to the maximum after the system stabilizes; record the change data of the outlet temperature of the refrigeration component in the first time period to determine the flow interference cycle of the outlet temperature of the refrigeration component.

[0043] Preferably, the first time is 2 minutes, and the time it takes for the outlet temperature of the refrigeration component to change from its minimum to 80% of its maximum is determined as the flow disturbance period. Specifically, as follows: Figure 2 As shown.

[0044] Preferably, the method for determining system stability is: the gas supply flow rate fluctuation within a set time is less than a set value.

[0045] The third step is to restore the gas supply flow to normal. After the system stabilizes, the temperature control valve 7 is controlled to move from the fully open position to the closed position within the control cycle. If the outlet temperature of the refrigeration component exceeds the limit during the valve operation, the temperature control valve 7 is controlled back to the fully open position.

[0046] Preferably, the control cycle is 2 minutes, and the output is 400 ms within each control cycle.

[0047] The fourth step involves recording the temperature change at the outlet of the refrigeration component during the operation of the temperature control valve 7. The cycle in which the temperature change at the outlet of the refrigeration component is most significant is analyzed to determine the operation control cycle of the temperature control valve 7.

[0048] Preferably, the time it takes for the outlet temperature of the refrigeration component to change from its minimum to 80% of its maximum is determined as the operating control cycle of the temperature control valve 7, such as... Figure 3 .

[0049] The fifth step is to use the maximum value of the flow disturbance cycle and the action control cycle as the control cycle of the temperature control valve 7, and design the control algorithm.

[0050] In summary, this application has the following advantages:

[0051] By adopting an intelligent strategy of "identification first, control later," a previously passive and fragile open-loop / weak closed-loop temperature control system has been upgraded into an active and robust closed-loop adaptive control system. This not only overcomes the persistent problem of gas flow fluctuations interfering with temperature control, but also brings systematic and cascading positive effects in improving control quality, enhancing system robustness, and simplifying engineering design.

[0052] The sensitivity of the entire temperature control system to disturbances at the bleed air end is greatly reduced, and "maintaining a constant inlet flow rate" is no longer a prerequisite. Therefore, temperature control valves with smaller adjustment ranges, lower costs, and higher reliability can be selected, or upstream systems can be allowed to operate within a wider range, thereby reducing the design complexity and manufacturing cost of the entire aircraft environmental control system.

[0053] By identifying the dynamic characteristics of the controlled object online and adaptively setting control parameters, the problem of controlling the outlet temperature of the refrigeration component caused by engine bleed air fluctuations is effectively solved, and effective temperature control by a single valve is achieved.

[0054] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for temperature control of a variable gas flow refrigeration component, characterized in that, include: The controller (1) sets the temperature control valve (7) to the fully open position; The controller (1) sets the gas supply flow rate to normal, starts the refrigeration component, and increases the gas supply flow rate to the maximum after the system stabilizes; records the change data of the outlet temperature of the refrigeration component in the first time period to determine the flow interference cycle of the outlet temperature of the refrigeration component. After the gas flow rate is restored to normal and the system is stabilized, the temperature control valve (7) is controlled to move from the fully open position to the closed position within the control cycle. If the outlet temperature of the refrigeration component exceeds the limit during the valve operation, the temperature control valve (7) is controlled back to the fully open position. During the operation of the temperature control valve (7), the temperature change at the outlet of the refrigeration component is recorded in the first time. The cycle in which the temperature change at the outlet of the refrigeration component is most obvious is analyzed to determine the operation control cycle of the temperature control valve (7). The maximum value of the flow disturbance cycle and the action control cycle is used as the control cycle of the temperature control valve (7), and a control algorithm is designed.

2. The temperature control method for a variable gas flow refrigeration component as described in claim 1, characterized in that, The time it takes for the outlet temperature of the refrigeration component to change from its minimum to 80% of its maximum is defined as the flow disturbance period.

3. The temperature control method for a variable gas flow refrigeration component as described in claim 1, characterized in that, The time it takes for the outlet temperature of the refrigeration component to change from the minimum to 80% of the maximum is determined as the operating control cycle of the temperature control valve (7).

4. The temperature control method for a variable gas flow refrigeration component as described in claim 1, characterized in that, The first time is 2 minutes, the control cycle is 2 minutes, and the output is 400 ms in each control cycle.

5. The temperature control method for a variable gas flow refrigeration component as described in claim 1, characterized in that, The method to determine system stability is: the gas supply flow rate fluctuation within a set time period is less than the set value.

6. The temperature control method for a variable gas flow refrigeration component as described in claim 1, characterized in that, The controller (1) outputs a 28V / PWM temperature control valve (7) to the fully open position.

7. A temperature control system for a variable gas flow rate refrigeration component, employing the method described in any one of claims 1-6, characterized in that, Includes a controller (1) and a refrigeration assembly; the controller (1) is used to control the state of the temperature control valve (7); The refrigeration assembly includes a radiator (2), a turbine (3), a condenser (5), a water separator (6), and a temperature control valve (7); the temperature control valve (7) is connected to the controller (1), and the temperature control valve (7) outputs a refrigeration assembly outlet; one end of the radiator (2) is connected to the temperature control valve (7) through a conduit, and the other end is connected to the condenser (5) through a conduit; the condenser (5) and the water separator (6) are connected through a conduit; the condenser (5) and the water separator (6) are connected to the turbine (3), and a fan (4) is connected to the turbine (3).

8. The temperature control system for the variable gas flow refrigeration component as described in claim 7, characterized in that, The temperature control valve (7) is a butterfly valve or a ball valve driven by a 28V / PWM duty cycle signal.

9. The temperature control system for the variable gas flow refrigeration component as described in claim 7, characterized in that, An outlet temperature sensor is provided on the outlet of the refrigeration component, and the controller (1) can collect the outlet temperature of the refrigeration component through the outlet temperature sensor.

10. The temperature control system for the variable gas flow refrigeration component as described in claim 7, characterized in that, In the controller (1), the time it takes for the outlet temperature of the refrigeration component to change from the minimum to 80% of the maximum is defined as the flow disturbance period.

11. The temperature control system for the variable gas flow rate refrigeration component as described in claim 7, characterized in that, In the controller (1), the time it takes for the outlet temperature of the refrigeration component to change from the minimum to 80% of the maximum is determined as the operation control cycle of the temperature control valve (7).

12. The temperature control system for the variable gas flow refrigeration component as described in claim 7, characterized in that, The controller (1) determines the stability of the system by: the gas supply flow rate fluctuation within a set time is less than the set value.

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