A synergic control method of lubricating system based on water-oil heat exchange

Abstract

The application discloses a kind of based on water oil heat exchange's lubricating system's synergic control method, belong to offshore large MW wind turbine cooling field, comprising: S1: construct water oil double cycle heat exchange architecture, including lubricating oil cooling circuit and water cooling circuit, the lubricating oil cooling circuit and water cooling circuit realize heat exchange by oil-water heat exchanger, the lubricating oil cooling circuit is communicated with gear box in lubricating system;S2: multi-mode coupling control, gear box operating condition, heat generation, and the opening of flow control three-way valve in water cooling circuit form closed loop;S3: lag compensation, based on the heat exchanger efficiency attenuation model constructed, dynamically corrects the heat dissipation result of lubricating oil cooling circuit, and completes three-way valve actual opening calculation;S4: fault safety design, based on three-way valve actual opening calculation result, increase boundary constraint design, complete water cooling circuit three-way valve execution opening setting.It solves the problems of low energy efficiency, poor temperature control accuracy and slow response in the prior art.

Description

Technical Field

[0001] This application belongs to the key technology field of cooling and lubrication of offshore large MW wind turbines, and in particular relates to a collaborative control method for a lubrication system based on water-oil heat exchange. Background Technology

[0002] In lubrication systems, the temperature control of lubricating oil is crucial for the stable operation of equipment. Excessively high oil temperatures can lead to decreased lubrication performance, accelerated oil oxidation, and even equipment failure; while excessively low oil temperatures may increase viscosity, resulting in increased flow resistance and affecting lubrication effectiveness. Therefore, how to efficiently and accurately control the temperature of lubricating oil has always been a key research focus in the industrial field.

[0003] Traditional air-cooled oil temperature control uses fans or heat sinks to cool the lubricating oil, which is simple in structure but inefficient. Water-cooled oil coolers rely on manual valve control for oil temperature regulation, which has a slow response time and cannot achieve dynamic adjustment. The traditional method of controlling the cooling water flow by adjusting the opening of an electric three-way valve has certain limitations; the oil-water heat exchange efficiency is affected by flow matching, and insufficient heat exchange or overcooling is prone to occur.

[0004] To address the above problems, this invention proposes a collaborative control method for a lubrication system based on water-oil heat exchange. Summary of the Invention

[0005] The purpose of this application is to overcome the problems of the prior art by disclosing a collaborative control method for a lubrication system based on water-oil heat exchange. Through multi-mode coupling control, hysteresis compensation algorithm and fault-safe design, the heat exchange efficiency is optimized to achieve high-precision, low-energy-consumption and fast-response control of oil temperature, thus solving the technical problems of low energy efficiency, poor temperature control accuracy and slow response in the prior art.

[0006] The objective of this application is achieved through the following technical solution:

[0007] A collaborative control method for a lubrication system based on water-oil heat exchange, the collaborative control method for the lubrication system comprising:

[0008] S1: Construct a water-oil dual-circulation heat exchange architecture, including a lubricating oil cooling circuit and a water cooling circuit. The lubricating oil cooling circuit and the water cooling circuit achieve heat exchange through an oil-water heat exchanger. The lubricating oil cooling circuit is connected to the gearbox in the lubrication system.

[0009] S2: Multi-mode coupling control, which forms a closed loop with the gearbox operating conditions, heat generation, and the opening degree of the flow control three-way valve in the water cooling circuit;

[0010] S3: Hysteresis compensation, based on the constructed heat exchanger efficiency decay model, dynamically corrects the heat dissipation results of the lubricating oil cooling circuit and completes the actual opening degree of the three-way valve. calculate;

[0011] S4: Fail-safe design, based on the actual opening degree calculation results of the three-way valve, adds boundary constraint design to complete the execution opening degree setting of the three-way valve in the water cooling circuit.

[0012] According to a preferred embodiment, the lubricating oil cooling circuit constructed in step S1 includes: a gearbox, a lubrication pump, a filter, a pressure valve, and an oil-water heat exchanger.

[0013] The gearbox is connected to the filter via a lubrication pump, which delivers lubricating oil from the gearbox to the filter for filtration. The filter is connected to the gearbox via a pressure valve or an oil-water heat exchanger, which allows the filtered lubricating oil to be reintroduced into the gearbox. When the oil temperature is lower than a preset temperature, the oil flows into the gearbox via the pressure valve. When the oil temperature is higher than the preset temperature, the oil flows into the gearbox via the oil-water heat exchanger.

[0014] According to a preferred embodiment, the water cooling circuit constructed in step S1 includes: an air-water heat exchanger, a generator, an oil-water heat exchanger, a water pump, a three-way valve, and an internal circulation pipeline;

[0015] The generator is connected to a water pump via an oil-water heat exchanger, and the water pump is connected to a three-way valve. The three-way valve is connected to the generator via an internal circulation pipeline and / or an air-water heat exchanger. The air-water heat exchanger is used to complete the auxiliary heat dissipation of the incoming water medium. The three-way valve completes the proportional control of the cooling water flow through the air-water heat exchanger by controlling the valve opening.

[0016] According to a preferred embodiment, step S2 includes: first, determining the heat generation of the gearbox based on the gearbox's rotational speed n and torque M. Dynamic calculation:

[0017] =

[0018] in, This is the gear contact loss coefficient. This is the viscosity-related loss coefficient. The bearing friction loss coefficient, This is a dynamic viscosity correction function;

[0019] Then, based on the heat generated by the gearbox Complete the opening of the three-way valve calculate:

[0020]

[0021] in, For environmental heat loss, Maximum heat dissipation represents the heat dissipation capacity of the oil-water heat exchanger under extreme operating conditions, expressed as the flow-opening characteristic curve. ,in, Indicates the valve opening degree. This represents the maximum flow rate, where k = 0.03~0.05. for The inverse function of .

[0022] According to a preferred embodiment, step S3 includes: calculating the heat dissipation of the oil-water heat exchanger.

[0023]

[0024] in, This represents the specific heat capacity at constant pressure. Indicates temperature difference. Indicates flow rate. Indicates the density of the medium. Indicates the heat transfer coefficient of the heat exchanger. This indicates the heat exchanger efficiency, and A represents the heat exchange area.

[0025] And the heat exchanger efficiency is realized based on the heat exchanger efficiency decay model. calculate:

[0026]

[0027] in, Indicates the initial efficiency. Indicates the pressure difference in the clean state. This indicates the real-time monitored pressure difference of the heat exchanger. τ represents the fouling accumulation coefficient, and τ represents the valve response time constant.

[0028] According to a preferred embodiment, step S3 includes: based on heat dissipation Complete the actual opening degree of the three-way valve calculate,

[0029] .

[0030] According to a preferred embodiment, in step S4, the three-way valve in the water cooling circuit opens to a certain degree. Set to:

[0031] .

[0032] According to a preferred embodiment, step S1, which constructs a dual-circulation water-oil heat exchange architecture, further includes a control terminal. The control terminal is based on a PLC programmable controller to complete sensor data acquisition and calculation, and to control the lubrication pump, water pump, and three-way valve. At the same time, it displays sensor data and sets alarm parameters through an HMI human-machine interface.

[0033] According to a preferred embodiment, the lubricating oil cooling circuit further includes: an oil pressure sensor and two oil temperature sensors. The oil pressure sensor is used for oil pressure monitoring, and the two oil temperature sensors are used to monitor the temperature of the lubricating oil entering and exiting the oil-water heat exchanger and feed it back to the control terminal.

[0034] According to a preferred embodiment, the water cooling circuit further includes: a water pressure sensor and two water temperature sensors; the water pressure sensor is used to monitor the pressure of the water cooling circuit, and the two water temperature sensors are used to monitor the temperature of the cooling water entering and exiting the oil-water heat exchanger and feed it back to the control terminal.

[0035] The aforementioned main solution and its various further alternative solutions can be freely combined to form multiple solutions, all of which are solutions that can be adopted and are claimed in this application. Those skilled in the art, after understanding the solution of this application, will realize that there are many combinations based on the prior art and common general knowledge, all of which are technical solutions to be protected in this application, and will not be exhaustively listed here.

[0036] The beneficial effects of this application are:

[0037] The collaborative control method of the lubrication system for water-oil heat exchange in this application adopts the coordinated operation of oil pump and water pump. Through the coordinated control of water circuit and oil circuit, the oil temperature is efficiently and accurately regulated. Multi-sensor feedback and three-way valve regulation improve the oil temperature control accuracy. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the implementation process of this application;

[0039] Figure 2 This is a schematic diagram of the dual-loop structure of this application. Detailed Implementation

[0040] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. This application can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, unless otherwise specified, the following embodiments and features in the embodiments can be combined with each other.

[0041] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0042] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0043] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0044] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0045] Furthermore, it should be noted that unless otherwise specified in this application, the specific structures, connections, positions, power sources, etc. involved are all things that a person skilled in the art can know without creative effort based on the prior art.

[0046] Example 1

[0047] refer to Figure 1 As shown in the figure, a collaborative control method for a lubrication system based on water-oil heat exchange is illustrated. The collaborative control method for the lubrication system includes the following steps.

[0048] Step S1: Construct a water-oil dual-circulation heat exchange architecture, including a lubricating oil cooling circuit and a water cooling circuit. The lubricating oil cooling circuit and the water cooling circuit achieve heat exchange through an oil-water heat exchanger. The lubricating oil cooling circuit is connected to the gearbox in the lubrication system.

[0049] Preferably, the lubricating oil cooling circuit constructed in step S1 includes: a gearbox, a lubrication pump, a filter, a pressure valve, and an oil-water heat exchanger. The gearbox is the core protected object of the lubrication system, where the lubricating oil reduces friction and cools the bearings and gears. The lubrication pump is used as the power source of the lubrication system, controls the oil circulation volume, and improves the heat exchange efficiency. The filter is used to filter the lubricating oil, filtering impurities in the lubricating oil to prevent particulate matter from damaging the gearbox or clogging the heat exchanger.

[0050] In the lubricating oil cooling circuit, the gearbox is connected to the filter via a lubrication pump. The lubrication pump delivers the lubricating oil in the gearbox to the filter to complete the oil filtration. The filter is connected to the gearbox via a pressure valve or an oil-water heat exchanger to re-input the filtered lubricating oil into the gearbox. When the oil temperature is lower than the preset temperature, the oil flows into the gearbox through the pressure valve. When the oil temperature is higher than the preset temperature, the oil flows into the gearbox through the oil-water heat exchanger.

[0051] Preferably, the water cooling circuit constructed in step S1 includes: an air-to-water heat exchanger, a generator, an oil-to-water heat exchanger, a water pump, a three-way valve, and an internal circulation pipeline. The generator corresponds to an offshore wind turbine generator set, and the water cooling circuit enables cooling of the unit's working chamber. The water pump drives the cooling water circulation and adjusts the water flow rate to match the oil temperature control requirements. The three-way valve (proportional control) dynamically adjusts the cooling water flow rate according to the oil temperature requirements, and some water can be bypassed to precisely control the heat exchange intensity.

[0052] In the water cooling circuit, the generator is connected to the water pump via an oil-water heat exchanger, the water pump is connected to a three-way valve, and the three-way valve is connected to the generator via an internal circulation pipeline and / or an air-water heat exchanger. The air-water heat exchanger is used to complete the auxiliary heat dissipation of the incoming water medium, and the three-way valve completes the proportional control of the cooling water flow through the air-water heat exchanger by controlling the valve opening.

[0053] Preferably, step S1, which constructs a dual-circulation water-oil heat exchange architecture, further includes a control terminal. The control terminal is based on a PLC programmable controller to complete sensor data acquisition and calculation, and to control the lubrication pump, water pump, and three-way valve. At the same time, it displays sensor data and sets alarm parameters through an HMI human-machine interface.

[0054] Furthermore, the lubricating oil cooling circuit also includes: an oil pressure sensor and two oil temperature sensors. The oil pressure sensor is used for oil pressure monitoring, and the two oil temperature sensors are used to monitor the temperature of the lubricating oil entering and exiting the oil-water heat exchanger and feed it back to the control terminal.

[0055] Furthermore, the water cooling circuit also includes: a water pressure sensor and two water temperature sensors; the water pressure sensor is used to monitor the pressure of the water cooling circuit, and the two water temperature sensors are used to monitor the temperature of the cooling water entering and exiting the oil-water heat exchanger and feed it back to the control terminal.

[0056] Step S2: Multi-mode coupling control, which forms a closed loop with the gearbox operating conditions, heat generation, and the opening degree of the flow control three-way valve in the water cooling circuit.

[0057] Specifically, step S2 includes: First, based on the gearbox's rotational speed n and torque M, calculating the gearbox's heat generation... Dynamic calculation:

[0058] =

[0059] in, The gear contact loss coefficient is taken as 0.05~0.08. The viscosity-related loss coefficient is taken as 0.002~0.004. The bearing friction loss coefficient is taken as 0.00008~0.00018. This is the dynamic viscosity correction function, obtained from actual measurement and calibration.

[0060] Then, based on the heat generated by the gearbox Complete the opening of the three-way valve calculate:

[0061]

[0062] in, For environmental heat loss, Maximum heat dissipation represents the heat dissipation capacity of the oil-water heat exchanger under extreme operating conditions, expressed as the flow-opening characteristic curve. ,in, Indicates the valve opening degree. This represents the maximum flow rate, where k = 0.03~0.05. for The inverse function of .

[0063] Step S3: Hysteresis compensation. Based on the constructed heat exchanger efficiency decay model, dynamically correct the heat dissipation results of the lubricating oil cooling circuit and complete the actual opening degree of the three-way valve. calculate.

[0064] Specifically, step S3 includes: realizing the heat exchanger efficiency based on the heat exchanger efficiency decay model. calculate:

[0065]

[0066] in Indicates the initial efficiency. Indicates the pressure difference in the clean state. This indicates the real-time monitored pressure difference of the heat exchanger. τ represents the fouling accumulation coefficient, and τ represents the valve response time constant.

[0067] Then, complete the heat dissipation calculation of the oil-water heat exchanger:

[0068]

[0069] in, This represents the specific heat capacity at constant pressure. Indicates temperature difference. Indicates flow rate. Indicates the density of the medium. Indicates the heat transfer coefficient of the heat exchanger. The value represents the heat exchanger efficiency, and A represents the heat exchange area.

[0070] Furthermore, based on heat dissipation Complete the actual opening degree of the three-way valve calculate:

[0071] .

[0072] Step S4: Fail-safe design. Based on the actual opening degree calculation results of the three-way valve, boundary constraint design is added to complete the execution opening degree setting of the three-way valve in the water cooling circuit.

[0073] Actual opening of the three-way valve It is the "ideal" valve opening output by the control algorithm, while the actual valve opening is... Physical constraints and fault protection need to be added on this basis.

[0074] That is,

[0075] .

[0076] The collaborative control method of the lubrication system for water-oil heat exchange in this application adopts the coordinated operation of oil pump and water pump. Through the coordinated control of water circuit and oil circuit, the oil temperature is efficiently and accurately regulated. Multi-sensor feedback and three-way valve regulation improve the oil temperature control accuracy.

[0077] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A collaborative control method for a lubrication system based on water-oil heat exchange, characterized in that, The coordinated control method for the lubrication system includes: S1: Construct a water-oil dual-circulation heat exchange architecture, including a lubricating oil cooling circuit and a water cooling circuit. The lubricating oil cooling circuit and the water cooling circuit achieve heat exchange through an oil-water heat exchanger. The lubricating oil cooling circuit is connected to the gearbox in the lubrication system. S2: Multi-mode coupling control, which forms a closed loop with the gearbox operating conditions, heat generation, and the opening degree of the flow control three-way valve in the water cooling circuit; S3: Hysteresis compensation, based on the constructed heat exchanger efficiency decay model, dynamically corrects the heat dissipation results of the lubricating oil cooling circuit and completes the actual opening degree of the three-way valve. calculate; S4: Fail-safe design, based on the actual opening degree calculation results of the three-way valve, adds boundary constraint design to complete the execution opening degree setting of the three-way valve in the water cooling circuit.

2. The coordinated control method for a lubrication system based on water-oil heat exchange as described in claim 1, characterized in that, The lubricating oil cooling circuit constructed in step S1 includes: a gearbox, a lubrication pump, a filter, a pressure valve, and an oil-water heat exchanger. The gearbox is connected to the filter via a lubrication pump, which delivers lubricating oil from the gearbox to the filter for filtration. The filter is connected to the gearbox via a pressure valve or an oil-water heat exchanger, which allows the filtered lubricating oil to be reintroduced into the gearbox. When the oil temperature is lower than a preset temperature, the oil flows into the gearbox via the pressure valve. When the oil temperature is higher than the preset temperature, the oil flows into the gearbox via the oil-water heat exchanger.

3. The coordinated control method for a lubrication system based on water-oil heat exchange as described in claim 2, characterized in that, The water cooling circuit constructed in step S1 includes: an air-water heat exchanger, a generator, an oil-water heat exchanger, a water pump, a three-way valve, and an internal circulation pipeline; The generator is connected to a water pump via an oil-water heat exchanger, and the water pump is connected to a three-way valve. The three-way valve is connected to the generator via an internal circulation pipeline and / or an air-water heat exchanger. The air-water heat exchanger is used to complete the auxiliary heat dissipation of the incoming water medium. The three-way valve completes the proportional control of the cooling water flow through the air-water heat exchanger by controlling the valve opening.

4. The coordinated control method for a lubrication system based on water-oil heat exchange as described in claim 2, characterized in that, Step S2 includes: First, based on the gearbox's rotational speed n and torque M, the heat generation of the gearbox is calculated. Dynamic calculation: = in, This is the gear contact loss coefficient. This is the viscosity-related loss coefficient. The bearing friction loss coefficient, This is a dynamic viscosity correction function; Then, based on the heat generated by the gearbox Complete the opening of the three-way valve calculate: in, For environmental heat loss, Maximum heat dissipation represents the heat dissipation capacity of the oil-water heat exchanger under extreme operating conditions, expressed as the flow-opening characteristic curve. ,in, Indicates the valve opening degree. This represents the maximum flow rate, where k = 0.03~0.

05. for The inverse function of .

5. The coordinated control method for a lubrication system based on water-oil heat exchange as described in claim 4, characterized in that, Step S3 includes: completing the heat dissipation calculation of the oil-water heat exchanger. in, This represents the specific heat capacity at constant pressure. Indicates temperature difference. Indicates flow rate. Indicates the density of the medium. Indicates the heat transfer coefficient of the heat exchanger. This indicates the heat exchanger efficiency, and A represents the heat exchange area. And the heat exchanger efficiency is realized based on the heat exchanger efficiency decay model. calculate: in, Indicates the initial efficiency. Indicates the pressure difference in the clean state. This indicates the real-time monitored pressure difference of the heat exchanger. τ represents the fouling accumulation coefficient, and τ represents the valve response time constant.

6. The coordinated control method for a lubrication system based on water-oil heat exchange as described in claim 5, characterized in that, Step S3 includes: based on heat dissipation Complete the actual opening degree of the three-way valve calculate, 。 7. The coordinated control method for a lubrication system based on water-oil heat exchange as described in claim 6, characterized in that, In step S4, the three-way valve in the water cooling circuit opens to the specified degree. Set to: 。 8. The coordinated control method for a lubrication system based on water-oil heat exchange as described in claim 1, characterized in that, Step S1, which constructs a dual-circulation water-oil heat exchange architecture, also includes a control terminal. The control terminal is based on a PLC programmable controller to complete sensor data acquisition and calculation, and to control the lubrication pump, water pump, and three-way valve. At the same time, it displays sensor data and sets alarm parameters through an HMI human-machine interface.

9. The coordinated control method for a lubrication system based on water-oil heat exchange as described in claim 8, characterized in that, The lubricating oil cooling circuit also includes: an oil pressure sensor and two oil temperature sensors. The oil pressure sensor is used for oil pressure monitoring, and the two oil temperature sensors are used to monitor the temperature of the lubricating oil entering and exiting the oil-water heat exchanger and feed it back to the control terminal.

10. The coordinated control method for a lubrication system based on water-oil heat exchange as described in claim 8, characterized in that, The water cooling circuit also includes: a water pressure sensor and two water temperature sensors; The water pressure sensor is used to monitor the pressure of the water cooling circuit, and the two water temperature sensors are used to monitor the temperature of the cooling water entering and exiting the oil-water heat exchanger and feed it back to the control terminal.

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