A thermal management system temperature adaptive control method

Abstract

The application discloses a temperature self-adaptive control method of a thermal management system, belonging to the field of aviation. The dynamic scheduling of the heat sink flow is realized through the self-adaptive control method, the flow of each branch heat sink is controlled according to the temperature and heat dissipation data acquisition information of the equipment, and the refrigeration capacity of the heat sink is dynamically adjusted. The self-adaptive control method realizes the accurate control of the heat sink outlet temperature of the equipment / heat exchanger and the like through the dynamic scheduling of the heat sink, and prevents the violation of the temperature constraint. The self-adaptive control method controls and optimizes the heat flow process, guarantees the efficient operation of the system, and can reduce the size and power consumption of the thermal management system. According to the measurement results of the temperature sensors on the equipment and pipelines and the working condition of the equipment, the controller adjusts the rotating speed of the pump and the opening degree of the electric flow regulating valve, so that the system has the self-adaptive control capability.

Description

Technical Field

[0001] This invention pertains to the field of aviation, specifically relating to an adaptive control method for a thermal management system. Background Technology

[0002] In the process of heat transfer, if the mass flow rate of the heat sink is fixed in certain states, the flow is restricted, and the heat exchangers or heat dissipation equipment will be overcooled, resulting in low utilization of the heat sink and a lot of heat accumulation during use, which further aggravates the heat dissipation problem. In order to comprehensively improve the cooling capacity of the aircraft, the thermal management system needs to be managed in a refined manner. Summary of the Invention

[0003] To address the aforementioned shortcomings, this invention provides a temperature adaptive control method for a thermal management system, thereby improving the heat dissipation performance of the thermal management system.

[0004] An adaptive control method for a thermal management system is described below:

[0005] 1) Install electric flow regulating valves, temperature sensors, and flow sensors in the thermal management system. The electric flow regulating valves are installed on each branch after each electric fuel pump, and the temperature sensors and flow sensors are installed on each branch.

[0006] 2) Analyze the heat transfer process of airborne equipment and heat exchangers. Heat Q is transferred through heat sinks such as fuel oil, as shown in the following formula:

[0007]

[0008] For the working fluid mass flow rate, The specific heat capacity of the working fluid. This refers to the outlet temperature of airborne equipment or heat exchangers. This refers to the inlet temperature of airborne equipment or heat exchangers.

[0009] 3) Based on the real-time power information of the airborne equipment and the data collected by the sensors, the controller calculates the heat dissipation of each airborne equipment and heat exchanger in real time; based on the heat transfer characteristics of each airborne equipment / heat exchanger and the outlet temperature limit, the controller calculates the real-time minimum mass flow control requirements on any branch using the heat transfer formula described in step 2).

[0010] 4) After obtaining the real-time minimum mass flow control requirement on any branch through the controller calculation, the minimum total mass flow control requirement on the pipeline at the outlet of the electric fuel pump is obtained. Based on the measured data of the flow sensor on the branch where the electric fuel pump is located, the speed of the electric fuel pump and / or the electric flow regulating valve are adjusted so that the flow demand at the outlet of the electric fuel pump meets the control requirements.

[0011] The adaptive control method enables dynamic scheduling of heat sink flow. Based on the temperature and heat dissipation data of the equipment, the flow of each branch heat sink is controlled to dynamically adjust the cooling capacity of the heat sink.

[0012] The adaptive control method achieves precise control of the heat sink outlet temperature of equipment / heat exchangers and other devices by dynamically scheduling the heat sink, thus preventing violations of temperature constraints.

[0013] Adaptive control methods ensure efficient system operation by controlling and optimizing the heat flow process, thereby reducing the size and power consumption of the thermal management system.

[0014] The controller adjusts the pump speed and the opening of the electric flow regulating valve based on the temperature sensor measurements on the equipment and pipelines, as well as the equipment's operating status, enabling the system to have adaptive control capabilities.

[0015] This invention utilizes an adaptive control method to dynamically allocate and control the flow rate based on the equipment's heat dissipation and temperature, thereby achieving comprehensive management of equipment heat dissipation and heat sink scheduling. This can improve the utilization efficiency of airborne energy and heat sinks, and alleviate the problem of insufficient aircraft heat dissipation capacity.

[0016] This invention is illustrated using a fuel thermal management system as an example, but is not limited to its application in fuel thermal management systems. For example, the adaptive control method can be used in liquid cooling systems, hydraulic systems, and other systems.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] (1) Reduced system power consumption. Adaptive control methods reduce the power consumption of the thermal management system by controlling and optimizing the heat flow process to ensure efficient system operation.

[0019] (2) Improved system heat dissipation capacity and heat sink utilization. Due to the precise allocation of heat sink flow by the adaptive control method, the temperature of the fuel entering the engine is increased to the maximum extent, which can give full play to the cooling capacity of the heat sink.

[0020] (3) Easy to implement. The adaptive manufacturing method provided by the present invention requires fewer finished product accessories, is easy to implement, and has a small weight cost.

[0021] (4) Improved system integration. It realizes the integrated scheduling and management of the heat dissipation requirements of airborne heat dissipation equipment and fuel heat sink. This makes the thermal management system more adaptive, flexible, and scalable, providing more ample thermal design space and capacity expansion space. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of a thermal management system scheme.

[0023] Figure 2 A schematic diagram of a specific implementation scheme for an adaptive control method for a thermal management system.

[0024] Figure 1 1-Electric flow regulating valve A, 2-Equipment cold plate, 3-Pump assembly A, 4-Pump assembly B, 5-Hydraulic equipment, 6-Electric flow regulating valve B, 7-Fuel-liquid heat exchanger, 8-Oil tank, 9-Electric fuel pump A, 10-Electric fuel pump B, 11-Electric flow regulating valve C, 12-Heat exchanger, 13-Fuel-hydraulic oil heat exchanger, 14-Fuel-lubricating oil heat exchanger, 15-Engine, 16-Electric flow regulating valve D, 17-Fuel-air heat exchanger, 18-Air-air heat exchanger, 19-Turbine assembly, 20-Compartment, 21-Electric flow regulating valve E, 22-Air-fuel heat exchanger;

[0025] Figure 2 The following flow sensors are used: Flow Sensor A (24), Flow Sensor B (26), Flow Sensor C (29), Flow Sensor D (32), Flow Sensor E (33), Flow Sensor F (34), Flow Sensor G (40), Flow Sensor H (43), and Flow Sensor I (45).

[0026] Temperature sensor A (23), temperature sensor B (25), temperature sensor C (27), temperature sensor D (28), temperature sensor E (30), temperature sensor F (31), temperature sensor G (35), temperature sensor H (36), temperature sensor I (37), temperature sensor J (38), temperature sensor K (39), temperature sensor L (41), temperature sensor M (42), temperature sensor N (44), temperature sensor O (48).

[0027] 46-Thermal Management Center Controller, 47-Controller.

[0028] Figure 1 , Figure 2 In this context, A represents coolant, B represents lubricating oil, and C represents air. Detailed Implementation

[0029] The following detailed description of the implementation of this invention is provided in conjunction with the accompanying drawings. The examples provided are not intended to limit the invention, but are merely illustrative to make the advantages of this invention clearer and easier to understand.

[0030] like Figure 1 , Figure 2As shown, the invented aircraft dynamic thermal management system adds the following components to the traditional thermal management system: electric flow regulating valve 1, electric flow regulating valve 6, electric flow regulating valve 11, electric flow regulating valve 16, temperature sensor B25, flow sensor B26, temperature sensor C27, temperature sensor D28, flow sensor C29, temperature sensor E30, temperature sensor F31, flow sensor D32, flow sensor E33, flow sensor F34, temperature sensor G35, temperature sensor H36, temperature sensor I37, temperature sensor J38, temperature sensor K39, flow sensor G40, temperature sensor L41, temperature sensor M42, flow sensor H43, temperature sensor N44, flow sensor I45, and thermal management center controller 46.

[0031] In this invention, the thermal management center controller 46 and controller 47 are only illustrative examples and do not constitute a limitation on this invention. For example, the thermal management center controller 46 and controller 47 in this invention can be a single controller or multiple controllers.

[0032] In this invention, all types of heat exchangers are used only as examples and do not constitute a limitation on this invention. Adjusting the relative positional relationship between heat exchangers, or adding / reducing heat exchangers, is also applicable to the adaptive control method proposed in this invention.

[0033] In this invention, the fuel coming out of the fuel tank 8 and passing through the outlet of the electric fuel pump A 9 is divided into two paths: one path passes through the electric flow regulating valve A 1; the other path passes through the electric fuel pump B 10.

[0034] In this invention, the fuel at the outlet of the electric fuel pump B 10 is divided into three paths. The first path of the fuel line is sequentially connected to the electric flow regulating valve B 6 and the fuel-liquid heat exchanger 7. The second path of the fuel line is sequentially connected to the electric flow regulating valve C 11 and the heat exchanger 12. After passing through the fuel-liquid heat exchanger 7, the first path of the fuel line merges with the second path of the fuel line after passing through the heat exchanger 12 and enters the fuel-hydraulic oil heat exchanger 13. The third path of the fuel line is sequentially connected to the electric flow regulating valve D 16 and the fuel-air heat exchanger 17.

[0035] The fuel line after passing through the fuel-air heat exchanger 17 merges with the fuel line after passing through the fuel-hydraulic oil heat exchanger 13 and then enters the fuel-lubricating oil heat exchanger 14.

[0036] After passing through the fuel-oil heat exchanger 14, the fuel line merges with the fuel line after passing through the electric flow regulating valve A1 and then splits into two paths. One path enters the engine 15; the other path passes through the electric flow regulating valve E 21 and the air-fuel heat exchanger 22 in sequence before entering the fuel tank 8.

[0037] Air from the engine bleed air inlet passes through the air-to-air heat exchanger 18, the fuel-to-air heat exchanger 17, and the turbine assembly 19 before entering the compartment 20.

[0038] The liquid cooling pipeline is sequentially connected to pump assembly A 3, equipment cold plate 2, and fuel-liquid heat exchanger 7; the hydraulic oil pipeline is sequentially connected to hydraulic equipment 5, pump assembly B 4, and fuel-hydraulic oil heat exchanger 13.

[0039] like Figure 2 As shown, controller 47 collects information from each sensor and transmits the relevant information to thermal management center controller 46.

[0040] The thermal management system implemented according to the present invention controls the rotational speed of electric fuel pump A9 and electric fuel pump B10 through the thermal management center controller 46, and simultaneously controls the opening degree of electric flow regulating valves A1, B6, C11, D16 and E21, thereby regulating the flow distribution on each branch.

[0041] Temperature sensor A23 and flow sensor A24 are installed between pump assembly A3 and equipment cold plate 2; temperature sensor B25 is installed between equipment cold plate 2 and fuel-liquid heat exchanger 7; flow sensor B26 is installed between electric flow regulating valve B6 and fuel-liquid heat exchanger 7; temperature sensor C27 is installed between pump assembly A3 and fuel-liquid heat exchanger 7; temperature sensor D28 and flow sensor C29 are installed between pump assembly B4 and hydraulic equipment 5; temperature sensor E30 is installed between hydraulic equipment 5 and fuel-hydraulic oil heat exchanger 13; temperature sensor F31 and flow sensor D32 are installed on the main pipeline at the outlet of electric fuel pump A9; flow sensor E33 is installed on the branch pipeline between electric fuel pump A9 and electric fuel pump B10; flow sensor F34 is installed between electric flow regulating valve C11 and heat exchanger 12; temperature sensor G is installed on the main pipeline after the confluence of heat exchanger 12 and fuel-liquid heat exchanger 7. 35; Temperature sensor H is installed on the branch of fuel-hydraulic oil heat exchanger 13 before it merges with fuel-air heat exchanger 17; temperature sensor L is installed on the branch of fuel-air heat exchanger 17 before it merges; temperature sensor I is installed on the main pipeline after it merges; temperature sensor J is installed on the branch of fuel-lubricating oil heat exchanger 14 before it merges with electric flow regulating valve A1; temperature sensor K is installed on the main pipeline after it merges and before it branches again; flow sensor G is installed between electric flow regulating valve D16 and fuel-air heat exchanger 17; temperature sensor M42 and flow sensor H43 are installed between air-air heat exchanger 18 and fuel-air heat exchanger 17; temperature sensor N44 is installed between fuel-air heat exchanger 17 and turbine assembly 19; flow sensor I is installed between electric flow regulating valve E21 and air-fuel heat exchanger 22. 45; A temperature sensor O48 is installed between the fuel tank 8 and the air-fuel heat exchanger 22;

[0042] The thermal management center controller 46 is connected to the electric flow regulating valve E21, electric flow regulating valve D16, electric fuel pump A9, electric fuel pump B10, electric flow regulating valve B6, electric flow regulating valve C11, electric flow regulating valve A1, and controller 47 respectively.

[0043] The controller 47 is connected to temperature sensor A23, flow sensor A24, temperature sensor B25, flow sensor B26, temperature sensor C27, temperature sensor D28, flow sensor C29, temperature sensor E30, temperature sensor F31, flow sensor D32, flow sensor E33, flow sensor F34, temperature sensor G35, temperature sensor H36, temperature sensor I37, temperature sensor J38, temperature sensor K39, flow sensor G40, temperature sensor L41, temperature sensor M42, flow sensor H43, temperature sensor N44, flow sensor I45, and temperature sensor O48. The heat transfer process of the airborne equipment and heat exchanger is analyzed. Heat Q is transferred through heat sinks such as fuel oil, as shown in the following formula:

[0044]

[0045] This refers to the mass flow rate of the working fluid (such as fuel in this example). The specific heat capacity of the working fluid. This refers to the outlet temperature of airborne equipment or heat exchangers. This refers to the inlet temperature of airborne equipment or heat exchangers.

[0046] Based on the real-time power information of the airborne equipment and the data collected by the sensors, the present invention calculates the heat dissipation of each airborne equipment and heat exchanger in real time through the thermal management center controller 46. Based on the heat transfer characteristics of each airborne equipment / heat exchanger and the outlet temperature limit, the real-time minimum mass flow control requirement on any branch can be calculated by the thermal management center controller 46 through the heat transfer formula mentioned above.

[0047] This invention, based on the real-time minimum mass flow control requirement calculated by the thermal management center controller 46 for any branch, can simultaneously obtain the minimum total mass flow control requirement for the three fuel lines at the outlet of the electric fuel pump B 10. Based on the measured data of the flow sensor E 33, the rotational speed of the electric fuel pump B 10 is adjusted so that the flow demand at the outlet of the electric fuel pump B 10 meets the control requirements.

[0048] Based on the flow requirements of engine 15 under different flight conditions and the minimum total mass flow control requirements of electric fuel pump B 10 calculated by thermal management center controller 46, the present invention takes the larger of the two as the control target value, and adjusts the rotation speed of electric fuel pump A9 according to the measured data of flow sensor D 32 so that the flow requirements of electric fuel pump A9 outlet meet the control requirements.

[0049] The opening degrees of electric flow regulating valves B6, C11, and D16 are adjusted to control the three fuel lines at the outlet of electric fuel pump B10 to meet the corresponding flow control requirements.

[0050] According to the mass flow control requirements of the electric fuel pump B10 outlet, this invention adjusts the opening degree of the electric flow regulating valve A1 and the rotational speed of the electric fuel pump B10.

[0051] According to the mass flow control requirements of engine 15, the present invention adjusts the opening of electric flow regulating valve E 21.

Claims

1. A temperature adaptive control method for a thermal management system, characterized in that, The specific steps are as follows: 1) Install electric flow regulating valves, temperature sensors, and flow sensors in the thermal management system. The electric flow regulating valves are installed on each branch after each electric fuel pump, and the temperature sensors and flow sensors are installed on each branch. 2) Analyze the heat transfer process of the airborne equipment and heat exchanger. The heat Q is transferred through the fuel heat sink, as shown in the following formula: For the working fluid mass flow rate, The specific heat capacity of the working fluid. This refers to the outlet temperature of airborne equipment or heat exchangers. This refers to the inlet temperature of airborne equipment or heat exchangers. 3) Based on the real-time power information of the airborne equipment and the data collected by the temperature sensor, the controller calculates the heat dissipation of each airborne equipment and heat exchanger in real time; based on the heat exchange characteristics of each airborne equipment / heat exchanger and the outlet temperature limit, the controller calculates the real-time minimum mass flow control requirement on any branch using the formula described in step 2). 4) After obtaining the real-time minimum mass flow control requirement on any branch through the controller calculation, the minimum total mass flow control requirement on the pipeline at the outlet of the electric fuel pump is obtained. Based on the measured data of the flow sensor on the branch where the electric fuel pump is located, the speed of the electric fuel pump and / or the electric flow regulating valve are adjusted so that the flow demand at the outlet of the electric fuel pump meets the control requirements.

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