Temperature determination method and device of heat exchange medium, electronic equipment, storage medium and vehicle

Abstract

The invention discloses a temperature determination method and device of a heat exchange medium, electronic equipment, a storage medium and a vehicle. The method comprises the steps that the pipe wall temperature of a heat exchange pipeline making contact with a heating element and the air temperature of air making contact with the heat exchange pipeline are obtained; according to first heat conduction heat resistance between the heating element and the pipe wall of the heat exchange pipeline and heat exchange medium convective heat exchange heat resistance of the heat exchange medium, first heat transfer heat resistance is calculated; according to the second heat conduction heat resistance of the heat transfer structure between the heat exchange medium and the air and the air convection heat transfer heat resistance of the air, the second heat transfer heat resistance is calculated; and according to the pipe wall temperature and the air temperature, a heat exchange medium temperature prediction value of the heat exchange medium is estimated based on the first heat transfer resistance and the second heat transfer resistance. The influence of air on heat exchange medium temperature estimation is reduced when the heat exchange medium temperature is estimated through the pipe wall temperature, so that a heat exchange medium temperature sensor is replaced by an algorithm, the cost is reduced, and the accuracy of heat exchange medium temperature estimation is improved.

Description

Technical Field

[0001] The present invention relates to the technical field related to vehicles, and in particular to a method and device for determining the temperature of a heat exchange medium, an electronic device, a storage medium and a vehicle. Background Art

[0002] When cooling a heating element, such as a vehicle's drive motor or generator, a temperature sensor is usually provided to monitor the temperature of the heating element. In addition, the heating element is connected to a radiator, and heat is conducted through the water in the radiator to achieve heat dissipation.

[0003] In order to monitor the temperature of the heat exchange medium in the radiator pipeline, for example, to monitor the temperature of the heat exchange medium at the outlet of the heat exchange pipeline and the temperature of the heat exchange medium at the inlet of the heat exchange pipeline, it is necessary to monitor the temperature of the heat exchange medium in the pipeline.

[0004] In order to reduce costs, the heat exchange medium temperature can be estimated by using the thermal resistance model of the heating element and the wall temperature of the heat exchange pipe of the radiator connected to the heating element, thereby reducing the use of heat exchange medium temperature sensors.

[0005] However, in the heating elements in the vehicle, the heat transfer structure is mostly made of metal, so the internal thermal conductivity is high and the thermal resistance is small. When the air flow rate is low, it can be considered that the internal temperature of the heating element is relatively uniform. However, when the air temperature is low, and at high flow and high heat transfer coefficient, a temperature difference between the internal measurement sensor and the heat exchange medium temperature will occur, resulting in a large error between the heat exchange medium temperature estimated by the pipe wall temperature and the actual measured heat exchange medium temperature.

[0006] Therefore, when the prior art uses the wall temperature of the heat exchange pipeline to estimate the temperature of the heat exchange medium, there is a technical problem that the error is large when the air flow velocity is high. Summary of the invention

[0007] Based on this, it is necessary to provide a method, device, electronic device, storage medium and vehicle for determining the temperature of a heat exchange medium in order to address the technical problem that when the existing technology uses the wall temperature of a heat exchange pipeline to estimate the temperature of a heat exchange medium, there is a large error when the air flow rate is high.

[0008] The present invention provides a method for determining the temperature of a heat exchange medium, comprising:

[0009] Acquiring the tube wall temperature of the heat exchange pipeline in contact with the heating element and the air temperature of the air in contact with the heat exchange pipeline;

[0010] Calculate the first heat transfer resistance according to the first heat conduction resistance between the heating element and the wall of the heat exchange pipeline and the heat exchange medium convection heat transfer resistance of the heat exchange medium, and calculate the second heat transfer resistance according to the second heat conduction resistance of the heat transfer structure between the heat exchange medium and the air and the air convection heat transfer resistance of the air;

[0011] According to the tube wall temperature and the air temperature, a predicted value of the heat exchange medium temperature at the outlet of the heat exchange pipeline is estimated based on the first heat transfer thermal resistance and the second heat transfer thermal resistance.

[0012] Further, the first heat transfer resistance is calculated based on the first heat conduction resistance between the heating element and the wall of the heat exchange pipeline and the heat exchange medium convection heat transfer resistance of the heat exchange medium, specifically including:

[0013] Obtaining a first heat conduction thermal resistance between the heating element and the wall of the heat exchange pipeline and obtaining a heat exchange medium convection heat transfer thermal resistance of the heat exchange medium;

[0014] The first heat transfer resistance between the heating element and the heat exchange medium is calculated as the sum of the first heat conduction resistance and the convection heat transfer resistance of the heat exchange medium.

[0015] Furthermore, the obtaining of the heat exchange medium convection heat transfer thermal resistance of the heat exchange medium specifically includes:

[0016] The heat transfer resistance of the heat transfer medium is calculated as:

[0017] Among them, R 1,conv is the convective heat transfer resistance of the heat exchange medium, is the mass flow rate of the heat exchange medium, C 1w is the fitting parameter of the first heat exchange medium, C 2w is the fitting parameter of the second heat exchange medium, C 3w is the fitting parameter of the third heat exchange medium, A w It is the heat exchange area between the heating element and the heat exchange medium.

[0018] Further, the second heat transfer resistance is calculated according to the second heat conduction resistance of the heat transfer structure between the heat exchange medium and the air and the air convection heat transfer resistance of the air, specifically including:

[0019] Obtaining a second heat conduction thermal resistance of a heat transfer structure between the heat exchange medium and the air and obtaining the air convection heat transfer thermal resistance;

[0020] The second heat transfer resistance between the heat exchange medium and the air is calculated as the sum of the second heat conduction resistance and the air convection heat transfer resistance.

[0021] Furthermore, obtaining the air convection heat transfer thermal resistance specifically includes:

[0022] The air convection heat transfer thermal resistance is calculated as:

[0023] Among them, R 2,conv is the air convection heat transfer thermal resistance, is the air mass flow rate, C 1a is the first air fitting parameter, C 2a is the second air fitting parameter, C 3a is the third air fitting parameter, A a It is the heat exchange area between the heat transfer structure between the heat exchange medium and the air.

[0024] Further, the estimated value of the heat exchange medium temperature at the outlet of the heat exchange pipeline is obtained based on the first heat transfer resistance and the second heat transfer resistance according to the pipe wall temperature and the air temperature, specifically including:

[0025] The predicted value of the heat exchange medium temperature of the heat exchange medium is calculated as: Where T water is the predicted value of the heat exchange medium temperature, T test is the tube wall temperature, T air is the air temperature, R 1 is the first heat transfer resistance, R 2 is the second heat transfer resistance.

[0026] Further, the obtaining of the tube wall temperature of the heat exchange pipeline in contact with the heating element and the air temperature of the air in contact with the heat exchange pipeline specifically includes:

[0027] Calculate the heat transfer sufficiency coefficient according to the heat transfer coefficient of the heat transfer medium and the mass flow rate of the heat transfer medium;

[0028] According to the heat transfer sufficiency coefficient, judging whether the heating element meets the replacement condition;

[0029] If the heating element meets the replacement condition, the tube wall temperature of the heat exchange pipeline in contact with the heating element and the air temperature of the air in contact with the heat exchange pipeline are obtained.

[0030] Furthermore, the heat transfer coefficient is: Wherein, N is the heat transfer coefficient, e is the natural constant, α w is the heat transfer coefficient of the heat transfer medium, A w is the heat exchange area between the heating element and the heat exchange medium, is the mass flow rate of the heat exchange medium, and Cp is the constant pressure specific heat of the heat exchange medium.

[0031] Furthermore, the replacement condition is:

[0032] If the heating element satisfies |ΔT·N|<|T at any flow rate Tolerence |, then it is judged that the heating element meets the replacement condition, otherwise it is judged that the heating element does not meet the replacement condition, where △T is the common difference between the heat exchange medium temperature and the tube wall temperature of the heating element, T Tolerence is the prediction error accuracy, and N is the heat transfer sufficiency coefficient.

[0033] The present invention provides a device for determining the temperature of a heat exchange medium, comprising:

[0034] An acquisition module, used to acquire the tube wall temperature of the heat exchange pipeline in contact with the heating element and the air temperature of the air in contact with the heat exchange pipeline;

[0035] a heat transfer resistance acquisition module, configured to calculate a first heat transfer resistance according to a first heat conduction resistance between a heating element and a pipe wall of the heat exchange pipeline and a heat exchange medium convection heat transfer resistance of the heat exchange medium, and to calculate a second heat transfer resistance according to a second heat conduction resistance of a heat transfer structure between the heat exchange medium and the air and an air convection heat transfer resistance of the air;

[0036] A heat exchange medium temperature prediction module is used to estimate a predicted value of the heat exchange medium temperature at the outlet of the heat exchange pipeline based on the tube wall temperature and the air temperature and based on the first heat transfer thermal resistance and the second heat transfer thermal resistance.

[0037] The present invention provides an electronic device, comprising:

[0038] at least one processor; and,

[0039] a memory communicatively connected to at least one of the processors; wherein,

[0040] The memory stores instructions that can be executed by at least one of the processors. The instructions are executed by at least one of the processors to enable the at least one of the processors to perform the method for determining the temperature of the heat exchange medium as described above.

[0041] The present invention provides a storage medium, wherein the storage medium stores computer instructions. When a computer executes the computer instructions, the storage medium is used to execute all steps of the method for determining the temperature of a heat exchange medium as described above.

[0042] The present invention provides a vehicle, comprising the device for determining the temperature of a heat exchange medium as described above, or the electronic device as described above.

[0043] The present invention obtains the tube wall temperature of the heat exchange pipeline in contact with the heating element and the air temperature of the air in contact with the heat exchange pipeline, and calculates the first heat transfer resistance according to the first heat conduction resistance from the heating element to the tube wall of the heat exchange pipeline and the heat exchange medium convection heat transfer resistance of the heat exchange medium, calculates the second heat transfer resistance according to the second heat conduction resistance of the heat transfer structure between the heat exchange medium and the air and the air convection heat transfer resistance of the air, and estimates the predicted value of the heat exchange medium temperature of the heat exchange medium based on the tube wall temperature and the air temperature and the first heat transfer resistance and the second heat transfer resistance. The present invention introduces a first heat conduction resistance between a heating element and the wall of the heat exchange pipeline, a heat exchange medium convection heat transfer resistance of the heat exchange medium, a second heat conduction resistance of the heat transfer structure between the heat exchange medium and the air, and an air convection heat transfer resistance of the air when estimating the temperature of the heat exchange medium by the wall temperature, thereby reducing the influence of the air on the estimation of the heat exchange medium temperature when estimating the heat exchange medium temperature by the wall temperature, thereby replacing the heat exchange medium temperature sensor with an algorithm, reducing costs and improving the accuracy of the estimated heat exchange medium temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 This is a working diagram of a method for determining the temperature of a heat exchange medium according to an embodiment of the present invention;

[0045] Figure 2 This is a working flow chart of a method for determining the temperature of a heat exchange medium according to another embodiment of the present invention;

[0046] Figure 3 This is a schematic diagram of building a heat exchange pipeline flow model in one example of the present invention;

[0047] Figure 4 This is a schematic diagram of a sufficient heat transfer coefficient curve of an example of the present invention;

[0048] Figure 5 A schematic diagram of the calculation effect of an example of the present invention;

[0049] Figure 6 This is a schematic diagram of a device for determining the temperature of a heat exchange medium according to an embodiment of the present invention;

[0050] Figure 7 The figure is a schematic diagram of the hardware structure of an electronic device of the present invention. DETAILED DESCRIPTION

[0051] The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings. The same components are represented by the same reference numerals. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the accompanying drawings, and the words "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0052] like Figure 1 The figure shows a working flow chart of a method for determining the temperature of a heat exchange medium according to an embodiment of the present invention, comprising:

[0053] Step S101, obtaining the tube wall temperature of the heat exchange pipeline in contact with the heating element and the air temperature of the air in contact with the heat exchange pipeline;

[0054] Step S102, calculating a first heat transfer resistance according to a first heat conduction resistance between the heating element and the wall of the heat exchange pipeline and a heat exchange medium convection heat transfer resistance of the heat exchange medium;

[0055] Step S103, calculating a second heat transfer resistance according to a second heat conduction resistance of the heat transfer structure between the heat exchange medium and the air and an air convection heat transfer resistance of the air;

[0056] Step S104: obtaining a predicted value of the heat exchange medium temperature at the outlet of the heat exchange pipeline by estimating the predicted value according to the tube wall temperature and the air temperature and based on the first heat transfer resistance and the second heat transfer resistance.

[0057] Specifically, the present invention can be applied to electronic devices with processing capabilities, such as an electronic control unit (ECU) or an extended domain control unit (XCU) of a vehicle.

[0058] Specifically, first, the electronic device executes step S101 to obtain the wall temperature of the heat exchange pipeline in contact with the heating element and the air temperature of the air in contact with the heat exchange pipeline.

[0059] In some embodiments, the heating element is a heating element that is air-cooled and liquid-cooled in the vehicle, and the heating element includes but is not limited to: a drive motor, a generator, etc. Specifically, the heating element can be air-cooled by a fan, and a heat exchange pipeline can dissipate heat through a heat exchange medium. The heat exchange medium is preferably cooling water for water cooling.

[0060] The heat exchange pipeline contains a heat exchange medium, such as cooling water, and the heating element exchanges heat with the heat exchange medium and air. The heat exchange process of the heating element is as follows: the heat source of the heating element -> the first heat transfer structure -> the internal measurement sensor of the heating element -> the second heat transfer structure -> the heat exchange medium -> the third heat transfer structure -> the air.

[0061] Therefore, the wall temperature of the heat exchange pipeline containing the heat exchange medium and the air temperature can be obtained.

[0062] Then, step S102 is performed to calculate the first heat transfer resistance according to the first heat conduction resistance between the heating element (including the heating element) and the pipe wall (including the pipe wall) of the heat exchange pipeline and the heat exchange medium convection heat transfer resistance of the heat exchange medium, and step S103 is performed to calculate the second heat transfer resistance according to the second heat conduction resistance of the heat transfer structure between the heat exchange medium and the air and the air convection heat transfer resistance of the air. Among them, step S102 and step S103 can be interchanged or performed in parallel.

[0063] Finally, step S104 is executed to estimate a predicted value of the heat exchange medium temperature at the outlet of the heat exchange pipeline according to the tube wall temperature and the air temperature and based on the first heat transfer resistance and the second heat transfer resistance.

[0064] The present invention obtains the tube wall temperature of the heat exchange pipeline in contact with the heating element and the air temperature of the air in contact with the heat exchange pipeline, and calculates the first heat transfer resistance according to the first heat conduction resistance from the heating element to the tube wall of the heat exchange pipeline and the heat exchange medium convection heat transfer resistance of the heat exchange medium, calculates the second heat transfer resistance according to the second heat conduction resistance of the heat transfer structure between the heat exchange medium and the air and the air convection heat transfer resistance of the air, and estimates the predicted value of the heat exchange medium temperature of the heat exchange medium based on the tube wall temperature and the air temperature and the first heat transfer resistance and the second heat transfer resistance. The present invention introduces a first heat conduction resistance between a heating element and the wall of the heat exchange pipeline, a heat exchange medium convection heat transfer resistance of the heat exchange medium, a second heat conduction resistance of the heat transfer structure between the heat exchange medium and the air, and an air convection heat transfer resistance of the air when estimating the temperature of the heat exchange medium by the wall temperature, thereby reducing the influence of the air on the estimation of the heat exchange medium temperature when estimating the heat exchange medium temperature by the wall temperature, thereby replacing the heat exchange medium temperature sensor with an algorithm, reducing costs and improving the accuracy of the estimated heat exchange medium temperature.

[0065] like Figure 2 The flowchart of a method for determining the temperature of a heat exchange medium in another embodiment of the present invention includes:

[0066] Step S201, calculating the heat transfer sufficiency coefficient according to the heat transfer coefficient of the heat transfer medium and the mass flow rate of the heat transfer medium.

[0067] In one embodiment, the heat transfer coefficient is: Wherein, N is the heat transfer coefficient, e is the natural constant, α w is the heat transfer coefficient of the heat transfer medium, A w is the heat exchange area between the heating element and the heat exchange medium, is the mass flow rate of the heat exchange medium, and Cp is the constant pressure specific heat of the heat exchange medium.

[0068] Step S202: judging whether the heating element meets a replacement condition according to the heat transfer sufficiency coefficient.

[0069] In one embodiment, the alternative condition is:

[0070] If the heating element satisfies |ΔT·N|<|T at any flow rate Tolerence |, then it is judged that the heating element meets the replacement condition, otherwise it is judged that the heating element does not meet the replacement condition, where △T is the common difference between the heat exchange medium temperature and the tube wall temperature of the heating element, T Tolerence is the prediction error accuracy, and N is the heat transfer sufficiency coefficient.

[0071] Step S203: if the heating element meets the replacement condition, the wall temperature of the heat exchange pipeline in contact with the heating element and the air temperature of the air in contact with the heat exchange pipeline are obtained.

[0072] Step S204, calculating a first heat transfer resistance according to a first heat conduction resistance from the heating element to the wall of the heat exchange pipeline and a heat exchange medium convection heat transfer resistance of the heat exchange medium.

[0073] In one embodiment, the first heat transfer resistance is calculated based on the first heat conduction resistance between the heating element and the wall of the heat exchange pipeline and the heat exchange medium convection heat transfer resistance of the heat exchange medium, specifically including:

[0074] Obtaining a first heat conduction thermal resistance between the heating element and the wall of the heat exchange pipeline and obtaining a heat exchange medium convection heat transfer thermal resistance of the heat exchange medium;

[0075] The first heat transfer resistance between the heating element and the heat exchange medium is calculated as the sum of the first heat conduction resistance and the convection heat transfer resistance of the heat exchange medium.

[0076] In one embodiment, obtaining the heat exchange medium convection heat transfer thermal resistance of the heat exchange medium specifically includes:

[0077] The heat transfer resistance of the heat transfer medium is calculated as:

[0078] Among them, R 1,conv is the convective heat transfer resistance of the heat exchange medium, is the mass flow rate of the heat exchange medium, C 1w is the fitting parameter of the first heat exchange medium, C 2w is the fitting parameter of the second heat exchange medium, C 3w is the fitting parameter of the third heat exchange medium, A w It is the heat exchange area between the heating element and the heat exchange medium.

[0079] Step S205 , calculating a second heat transfer resistance according to a second heat conduction resistance of the heat transfer structure between the heat exchange medium and the air and an air convection heat transfer resistance of the air.

[0080] In one embodiment, the second heat transfer resistance is calculated based on the second heat conduction resistance of the heat transfer structure between the heat exchange medium and the air and the air convection heat transfer resistance of the air, specifically including:

[0081] Obtaining a second heat conduction thermal resistance of a heat transfer structure between the heat exchange medium and the air and obtaining the air convection heat transfer thermal resistance;

[0082] The second heat transfer resistance between the heat exchange medium and the air is calculated as the sum of the second heat conduction resistance and the air convection heat transfer resistance.

[0083] In one embodiment, obtaining the air convection heat transfer thermal resistance specifically includes:

[0084] The air convection heat transfer thermal resistance is calculated as:

[0085] Among them, R 2,conv is the air convection heat transfer thermal resistance, is the air mass flow rate, C 1a is the first air fitting parameter, C 2a is the second air fitting parameter, C 3a is the third air fitting parameter, A a It is the heat exchange area between the heat transfer structure between the heat exchange medium and the air.

[0086] Step S206: obtaining a predicted value of the heat exchange medium temperature at the outlet of the heat exchange pipeline by estimating the predicted value according to the tube wall temperature and the air temperature and based on the first heat transfer resistance and the second heat transfer resistance.

[0087] In one embodiment, the estimating the predicted value of the heat exchange medium temperature at the outlet of the heat exchange pipeline based on the first heat transfer resistance and the second heat transfer resistance according to the pipe wall temperature and the air temperature specifically includes:

[0088] The predicted value of the heat exchange medium temperature of the heat exchange medium is calculated as: Where T water is the predicted value of the heat exchange medium temperature, T test is the tube wall temperature, T air is the air temperature, R 1 is the first heat transfer resistance, R 2 is the second heat transfer resistance.

[0089] Specifically, firstly, step S201 is executed to calculate the heat transfer sufficiency coefficient according to the heat transfer coefficient of the heat transfer medium and the mass flow rate of the heat transfer medium.

[0090] Specifically, the heat transfer coefficient of the heat exchange medium and the mass flow rate of the heat exchange medium are determined by the existing method, for example, the heat transfer coefficient of water and the mass flow rate of water are determined by the existing method.

[0091] In some embodiments, a heat exchange pipeline flow model is constructed through a neural network model to obtain the mass flow rate of the heat exchange medium of the heating element under different working conditions, such as the water mass flow rate.

[0092] The neural network model is established by obtaining physical model data according to experimental data, and then expanded from the physical model data.

[0093] Specifically, the mass flow rate of the heat exchange medium of the heating element under different working conditions is constant. Therefore, the existing heat exchange pipeline flow model building method can be used to build a heat exchange pipeline flow model, and when the working condition of the heating element is determined, the corresponding heat exchange medium mass flow rate can be obtained. Figure 3 As shown, firstly, the experimental data 301 is acquired, then modeling correction is performed, and the GTPower (engine working process simulation calculation software) model 302 is input, and the mapping database 303 is obtained through DoE, and the ANN flow static model 304 is obtained through feature screening, training, and verification, and the flow dynamic model 303 is obtained through the time constant.

[0094] As an example, the heat exchange pipeline flow model is built as follows:

[0095] 1. Obtain key flow data in the experiment, correct parameters such as pump pressure rise, component pressure drop, and along-the-way loss, build a physical model, and make corrections based on key experimental data.

[0096] 2. Build a physical model based on the experimental data and expand the experimental data. This step can calculate the branch flow that is not measured in the experiment but is relevant to the simulation. Specifically, the physical model is built through GT Power software. Then the database is mapped through the Design of Experiment (DOE). The mapping database can be regarded as a large amount of mapping data corresponding to input and output, and a neural network model can be established.

[0097] 3. Based on the data obtained in step 2, the control quantity in the system is used as the modeling feature, and the feature is expanded according to the physical meaning, as shown in Table 1. The expansion basis can be the order relationship between the pump speed and head, temperature and radiation heat transfer, and the instantaneous energy and accumulated energy entering the system.

[0098]

[0099] Feature screening is performed based on the extended features, and the screening method is based on the pan-neural network GRNN with joint probability distribution.

[0100] The screening process is as follows:

[0101] 4.1 Put all the features to be selected into the selected set, and the selected set is an empty set at this time;

[0102] 4.2 Use the features in the candidate set to approximate the output value through GRNN, traverse the features in the candidate set, and select the feature with the minimum mean squared error (MSE) to enter the selected set;

[0103] 4.3 Then enter the iterative process, at this time the fitting target is changed to the remaining information after the output value of the feature fitting in the selected set, and the feature with the smallest MSE is selected to enter the selected set;

[0104] 4.4 Iterate in sequence until all the features in the set to be selected are traversed.

[0105] GRNN is based on probability and can better reflect the one-to-one correspondence between the control quantity as the model input and the state quantity as the model output.

[0106] 5. According to the feature order given by the screening results, the first four features that reduce the GRNN fitting MSE to 0 are selected, which can ensure accuracy and avoid feature redundancy.

[0107] 6. Randomly divide the data obtained in step 2 into training sets and test sets, establish a neural network model based on the screening features, use the K test to obtain the accuracy comparison of the model, and select the best traffic model based on the comprehensive training accuracy and test accuracy, that is, Figure 3 Static model of traffic.

[0108] 7. Build a steady-state heat transfer model for the heat exchange components in the system. The heat absorbed under steady-state conditions causes its temperature to change

[0109]

[0110] The heat source is the heating element and the heat exchange medium, such as water heat exchange, so there are:

[0111] Q 吸 =α w ·dA w ·(T B -T w )=α w ·L c ·dx·(T B -T w )(2)

[0112] Where Qab is the absorbed heat, C p is the constant pressure specific heat of the heat exchange medium, is the mass flow rate of cooling heat exchange medium, T w is the temperature of the heat transfer medium, T B is the temperature of the heating element, L C is the characteristic length of the heat exchange component, indicating the heat exchange area per unit length, α w is the heat transfer coefficient of the heat transfer medium, dA w is the differential of the heat transfer area of ​​the heat transfer medium, and dx is the differential of the heat transfer length. Formula (1) and formula (2) are combined and integrated over the length from the inlet to the outlet of the heat transfer component to obtain

[0113]

[0114] Since the thermal mass of the heat exchange component is relatively large relative to the heat transfer amount within a unit step, it can be considered that the temperature of the heat exchange component remains unchanged within a unit step.

[0115] 8. Fit the heat transfer coefficient according to the mass flow rate to ensure that the heat transfer coefficient in the heat exchange pipeline is within a reasonable range and the trend is correct.

[0116] 9. Calculate the heat transfer heat Q per unit time step 吸 ,The temperature change of the heat exchange component within the step is calculated by formula (1), and the temperature of the heat exchange element is updated when calculating the next step.

[0117] 10. Identify the characteristic length of the heat exchange element through experimental data, compensate for the lack of flow rate, and calibrate the flow model. Figure 3 The flow dynamic model shown is a model obtained by adding filtering to the static model of the neural network. According to the flow dynamic model, the mass flow rate of the heat exchange medium of the heating element under different working conditions can be determined.

[0118] After determining the mass flow rate of the heat exchange medium, the heat transfer coefficient of the heat exchange medium can be fitted according to the mass flow rate of the heat exchange medium or the Reynolds number can be calculated according to the dimensionless method, and then the heat transfer coefficient of the heat exchange medium can be determined according to the relationship between the Prandtl number and the Nusselt number.

[0119] According to the mass flow rate of the heat exchange medium, the heat transfer coefficient of the heat exchange medium can be fitted by a quadratic polynomial, and the formula is as follows:

[0120]

[0121] Among them, α w is the heat transfer coefficient of the heat transfer medium, is the mass flow rate of heat transfer medium, C 1w , C 2w , C3w is the fitting coefficient, which needs to be fitted according to the experimental value.

[0122] The dimensionless method involves two flow regimes, laminar and turbulent, which are distinguished by the Reynolds number, which is calculated as:

[0123]

[0124] Nusselt number calculation formula:

[0125]

[0126] In the formula, α w is the heat transfer coefficient of the heat transfer medium, V is the flow rate of the heat transfer medium, L is the heat transfer length, v is the dynamic viscosity of the heat transfer medium, and λ is the thermal conductivity coefficient. The air heat transfer coefficient can then be obtained as:

[0127]

[0128] In the formula, Pr is the Prandtl number of the heat transfer medium, and f(Re,Pr) is the empirical function used to calculate the Nusselt number.

[0129] Then, the heat transfer sufficiency coefficient is calculated according to the heat transfer coefficient of the heat transfer medium and the mass flow rate of the heat transfer medium.

[0130] In one embodiment, the heat transfer coefficient is: Wherein, N is the heat transfer coefficient, e is the natural constant, α w is the heat transfer coefficient of the heat transfer medium, A w is the heat exchange area between the heating element and the heat exchange medium, is the mass flow rate of the heat exchange medium, and Cp is the constant pressure specific heat of the heat exchange medium.

[0131] Specifically, the heat transfer coefficient is calculated according to the air heat transfer coefficient and the air mass flow rate using formula (8), and a heat transfer coefficient curve can be drawn.

[0132]

[0133] Wherein, N is the heat transfer coefficient, e is the natural constant, α w is the heat transfer coefficient of the heat transfer medium, A w is the heat exchange area between the heating element and the heat exchange medium, is the mass flow rate of the heat exchange medium, and Cp is the constant pressure specific heat of the heat exchange medium.

[0134] The heat transfer coefficient describes the ratio of the outlet temperature difference and the inlet temperature difference between the heat transfer medium and the pipe wall in the heat transfer process, which depends on the flow rate and the physical size characteristics of the heat transfer, that is, the heat transfer area in the pipe. Figure 4 Shown are a heat transfer coefficient curve 41 of heating element a, a heat transfer coefficient curve 42 of heating element b, and a heat transfer coefficient curve 43 of heating element c.

[0135] This embodiment provides a method for calculating the heat transfer sufficiency coefficient.

[0136] Then, step S202 is executed to determine whether the heating element meets the replacement condition according to the heat transfer sufficiency coefficient.

[0137] In one embodiment, the alternative condition is:

[0138] If the heating element satisfies |ΔT·N|<|T at any flow rate Tolerence |, then it is judged that the heating element meets the replacement condition, otherwise it is judged that the heating element does not meet the replacement condition, where △T is the common difference between the heat exchange medium temperature and the tube wall temperature of the heating element, T Tolerence is the prediction error accuracy, and N is the heat transfer sufficiency coefficient.

[0139] like Figure 4 As shown, the selection of heating elements is described by taking heating element a, heating element b, and heating element c as examples. The heating element using a virtual temperature sensor instead of a real sensor is determined according to the sufficient heat transfer coefficient curve and the virtual temperature error range.

[0140] |ΔT·N|<|T Tolerence | (9)

[0141] Wherein, ΔT is the commonly used difference between the heat exchange medium temperature and the tube wall temperature of the heating element, T Tolerence is the prediction error accuracy, and N is the heat transfer sufficiency coefficient.

[0142] Specifically, under different flow rates, the absolute value of the commonly used difference between the heat exchange medium temperature and the tube wall temperature of the heating element |ΔT·N| is smaller than the absolute value of the prediction error accuracy |T Tolerence |, it is considered that the heating element c can use the test pipe wall temperature to calculate the downstream test heat exchange medium temperature, and the downstream test heat exchange medium temperature is the heat exchange medium temperature at the outlet of the heat exchange pipeline.

[0143] like Figure 4 In the cooling process of the heating element c, the common difference between the temperature of the heat exchange medium and the temperature of the tube wall is △T, which can be obtained through big data. The prediction error accuracy does not exceed T Tolerence, under different flow rates, formula (9) is satisfied. It is considered that the heating element c can use the test pipe wall temperature to calculate the downstream test heat exchange medium temperature. Figure 4 The heat transfer coefficient curve 43 of the heating element c is used to calculate that the N of the heating element c is very small, so the heat transfer is more sufficient, so the outlet temperature and the tube wall temperature are closer, so the heating element c meets the requirements.

[0144] Then, execute step S203 to step S206 to perform dynamic correction for sufficient heat exchange. Among them, the heat exchange pipeline contains a heat exchange medium, and the heating element exchanges heat with the heat exchange medium and the air. The heat exchange process of the heating element is as follows: the heat source of the heating element-> the first heat transfer structure-> the internal measurement sensor of the heating element-> the second heat transfer structure-> the heat exchange medium-> the third heat transfer structure-> the air. In the heating elements in the vehicle, the heat transfer structure is mostly made of metal, so the internal thermal conductivity is high and the thermal resistance is small. When the air flow rate is low, it can be considered that the internal temperature of the heating element is relatively uniform. However, when the air temperature is low, and at a high flow rate and a high heat transfer coefficient, a temperature difference will occur from the internal measurement sensor to the heat exchange medium temperature. Therefore, this part of the correction is still needed to estimate the downstream heat exchange medium temperature using the pipe wall temperature.

[0145] Specifically, step S203 is first performed, and if the heating element meets the replacement condition, the tube wall temperature of the heat exchange pipeline in contact with the heating element and the air temperature of the air in contact with the heat exchange pipeline are obtained.

[0146] Then, step S204 is executed to calculate the first heat transfer resistance according to the first heat conduction resistance between the heating element and the wall of the heat exchange pipeline and the heat exchange medium convection heat transfer resistance of the heat exchange medium, and step S205 is executed to calculate the second heat transfer resistance according to the second heat conduction resistance of the heat transfer structure between the heat exchange medium and the air and the air convection heat transfer resistance of the air.

[0147] Among them, step S204 and step S205 can be interchanged or executed in parallel.

[0148] In one embodiment, the first heat transfer resistance is calculated based on the first heat conduction resistance between the heating element and the wall of the heat exchange pipeline and the heat exchange medium convection heat transfer resistance of the heat exchange medium, specifically including:

[0149] Obtaining a first heat conduction thermal resistance between the heating element and the wall of the heat exchange pipeline and obtaining a heat exchange medium convection heat transfer thermal resistance of the heat exchange medium;

[0150] The first heat transfer resistance between the heating element and the heat exchange medium is calculated as the sum of the first heat conduction resistance and the convection heat transfer resistance of the heat exchange medium.

[0151] Among them, the first heat transfer resistance is composed of the first heat conduction resistance between the heating element and the pipe wall of the heat exchange pipeline and the heat exchange medium convection heat transfer resistance of the heat exchange medium. Therefore, the first heat conduction resistance and the heat exchange medium convection heat transfer resistance are determined respectively, and then the first heat transfer resistance is determined.

[0152] Among them, the first heat conduction thermal resistance is the heat transfer thermal resistance between the heating element, the first heat transfer structure, the measurement sensor inside the heating element, the second heat transfer structure and the pipe wall contacted by the heat exchange medium, which can be obtained by conducting experiments on the heating element and fitting the heat exchange medium temperature test value at the outlet of the heat exchange pipeline tested by the experiment and the predicted value of the heat exchange medium temperature.

[0153] The convective heat transfer thermal resistance of the heat exchange medium is calculated based on the mass flow rate of the heat exchange medium.

[0154] In one embodiment, obtaining the heat exchange medium convection heat transfer thermal resistance of the heat exchange medium specifically includes:

[0155] The heat transfer resistance of the heat transfer medium is calculated as:

[0156] Among them, R 1,conv is the convective heat transfer resistance of the heat exchange medium, is the mass flow rate of the heat exchange medium, C 1w is the fitting parameter of the first heat exchange medium, C 2w is the fitting parameter of the second heat exchange medium, C 3w is the fitting parameter of the third heat exchange medium, A w It is the heat exchange area between the heating element and the heat exchange medium.

[0157] Specifically, a heat transfer medium convective heat transfer thermal resistance formula (10) is established. The heat transfer medium convective heat transfer thermal resistance formula calculates the heat transfer medium convective heat transfer thermal resistance according to the heat transfer medium mass flow rate and the heat transfer medium fitting parameters. The heat transfer medium fitting parameters are obtained by fitting the heat transfer medium temperature test value at the heat transfer pipeline outlet of the experimental test and the heat transfer medium temperature prediction value.

[0158]

[0159] Among them, R 1,conv is the convective heat transfer resistance of the heat exchange medium, is the mass flow rate of the heat exchange medium, C 1w is the fitting parameter of the first heat exchange medium, C 2w is the fitting parameter of the second heat exchange medium, C 3w is the fitting parameter of the third heat exchange medium, A w It is the heat exchange area between the heating element and the heat exchange medium.

[0160] This embodiment provides a calculation formula for the convective heat transfer thermal resistance of the heat exchange medium.

[0161] Then, the first heat transfer resistance is calculated as the sum of the first heat conduction resistance and the convection heat transfer resistance of the heat exchange medium.

[0162] Specifically, the first heat transfer resistance is calculated using formula (11):

[0163] R 1 =R 1,cond +R 1,conv (11)

[0164] Among them, R 1 is the first heat transfer resistance, R 1,cond is the first thermal conduction resistance, R 1,conv is the convective heat transfer thermal resistance of the heat transfer medium.

[0165] In one embodiment, the second heat transfer resistance is calculated based on the second heat conduction resistance of the heat transfer structure between the heat exchange medium and the air and the air convection heat transfer resistance of the air, specifically including:

[0166] Obtaining a second heat conduction thermal resistance of a heat transfer structure between the heat exchange medium and the air and obtaining the air convection heat transfer thermal resistance;

[0167] The second heat transfer resistance between the heat exchange medium and the air is calculated as the sum of the second heat conduction resistance and the air convection heat transfer resistance.

[0168] Among them, the second heat transfer resistance is composed of the second heat conduction resistance of the heat transfer structure between the heat exchange medium and the air and the air convection heat transfer resistance. Therefore, the second heat conduction resistance of the heat transfer structure between the heat exchange medium and the air and the air convection heat transfer resistance are first determined respectively, and then the second heat transfer resistance is determined.

[0169] Among them, the second heat conduction thermal resistance of the heat transfer structure between the heat exchange medium and the air can be obtained by experimenting on the heating element and fitting the heat exchange medium temperature test value at the outlet of the heat exchange pipeline and the predicted value of the heat exchange medium temperature.

[0170] In one embodiment, obtaining the air convection heat transfer thermal resistance specifically includes:

[0171] The air convection heat transfer thermal resistance is calculated as:

[0172] Among them, R 2,conv is the air convection heat transfer thermal resistance, is the air mass flow rate, C1a is the first air fitting parameter, C 2a is the second air fitting parameter, C 3a is the third air fitting parameter, A a It is the heat exchange area between the heat transfer structure between the heat exchange medium and the air.

[0173] Specifically, the air mass flow rate can be determined through existing technologies. For example, for the heating elements of the vehicle, the vehicle speed and the fan speed have a corresponding relationship with the air mass flow rate. The relationship between the vehicle speed, the fan speed and the air mass flow rate can be determined through preliminary experimental calibration, and then the corresponding air mass flow rate can be determined based on the vehicle speed and the fan speed.

[0174] Then, the air convection heat transfer thermal resistance is calculated according to the air mass flow rate and the air fitting parameters, wherein the air fitting parameters are obtained by fitting the heat exchange medium temperature test value at the heat exchange pipeline outlet in the experimental test and the heat exchange medium temperature prediction value.

[0175] Specifically, the air convection heat transfer thermal resistance can be obtained according to formula (12):

[0176]

[0177] Among them, R 2,conv is the air convection heat transfer thermal resistance, is the air mass flow rate, C 1a is the first air fitting parameter, C 2a is the second air fitting parameter, C 3a is the third air fitting parameter, A a It is the heat exchange area between the heat transfer structure between the heat exchange medium and the air.

[0178] This embodiment provides a calculation formula for the thermal resistance of air convection heat transfer.

[0179] Then, the second heat transfer resistance between the heat exchange medium and the air is calculated as the sum of the second heat conduction resistance and the air convection heat transfer resistance.

[0180] Specifically, the second heat transfer resistance is calculated using formula (13):

[0181] R 2 =R 2,cond +R 2,conv (13)

[0182] Among them, R 2 is the second heat transfer resistance, R 2,cond is the second thermal conduction resistance, R 2,conv is the thermal resistance of air convection heat transfer.

[0183] Finally, step S206 is executed to estimate a predicted value of the heat exchange medium temperature at the outlet of the heat exchange pipeline according to the tube wall temperature and the air temperature and based on the first heat transfer resistance and the second heat transfer resistance.

[0184] In one embodiment, the estimating the predicted value of the heat exchange medium temperature at the outlet of the heat exchange pipeline based on the first heat transfer resistance and the second heat transfer resistance according to the pipe wall temperature and the air temperature specifically includes:

[0185] The predicted value of the heat exchange medium temperature of the heat exchange medium is calculated as: Where T water is the predicted value of the heat exchange medium temperature, T test is the tube wall temperature, T air is the air temperature, R 1 is the first heat transfer resistance, R 2 is the second heat transfer thermal resistance, and the first heat transfer thermal resistance and the second heat transfer thermal resistance are obtained by fitting the test value of the heat exchange medium temperature at the outlet of the heat exchange pipeline in the experimental test and the predicted value of the heat exchange medium temperature.

[0186] Specifically, according to steady-state heat transfer, there are formulas (14) and (15)

[0187] T test =T water +Q·R 1 (14)

[0188] T water =Tair+Q·R 2 (15)

[0189] Among them, T water is the predicted value of the heat exchange medium temperature at the outlet of the heat exchange pipeline, T test is the tube wall temperature, T air is the air temperature, R 1 is the first heat transfer resistance, R 2 is the second heat transfer resistance, and Q is the heat dissipation of the heating element.

[0190] Combining formulas (14) and (15), the temperature of the heat transfer medium can be obtained as follows:

[0191]

[0192] Among them, R 1 , R 2 The value of is obtained by fitting the test value of the heat exchange medium temperature at the outlet of the heat exchange pipeline in the experimental test and the predicted value of the heat exchange medium temperature.

[0193] Specifically, substitute formulas (10) to (13) into formula (16) and set the first thermal conduction resistance R 1,cond , initially set the second thermal conduction resistance R 2,cond At the same time, the first heat exchange medium fitting parameter C in formula (10) and formula (12) is initially set 1w , the second heat exchange medium fitting parameter C 2w , the third heat exchange medium fitting parameter C 3w , the first air fitting parameter C 1w , the second air fitting parameter C 22 , and the third air fitting parameter C 32 .

[0194] Then, the predicted value of the heat exchange medium temperature calculated according to formula (16) is compared with the test value of the heat exchange medium temperature at the outlet of the heat exchange pipeline obtained from the heating element experiment, and the first heat conduction thermal resistance R is obtained by fitting through the least squares method. 1,cond , the second thermal conduction resistance R 2,cond , the first heat exchange medium fitting parameter C 1w , the second heat exchange medium fitting parameter C 2w , the third heat exchange medium fitting parameter C 3w , the first air fitting parameter C 1w , the second air fitting parameter C 22 , and the third air fitting parameter C 32 The first thermal conduction resistance R 1,cond , the second thermal conduction resistance R 2,cond , the first heat exchange medium fitting parameter C 1w , the second heat exchange medium fitting parameter C 2w , the third heat exchange medium fitting parameter C 3w , the first air fitting parameter C 1w , the second air fitting parameter C 22 , and the third air fitting parameter C 32 Substituting into formula (16), we obtain the prediction formula for calculating the heat exchange medium temperature of the heating element.

[0195] In actual use, after determining that the heating element meets the replacement conditions, formula (16) can be used to estimate the predicted value of the heat exchange medium temperature at the outlet of the heat exchange pipeline based on the first heat transfer resistance and the second heat transfer resistance according to the pipe wall temperature and the air temperature.

[0196] like Figure 5The figure shows a schematic diagram of the calculation effect of an example of the present invention, including a test heat exchange medium temperature curve 51, a pipe wall temperature heat exchange medium temperature curve 52, and a heat exchange medium temperature curve 53 predicted by the method of this embodiment. The horizontal axis is time, unit: s, and the vertical axis is temperature, unit: ° C. From the effect, it can be seen that the model of this embodiment after air flow delay can simulate the test heat exchange medium temperature very well. The uncorrected model can only meet the heat exchange medium temperature under low flow conditions, and the simulation of the high air flow condition of 700-1200s is inaccurate and the error is large.

[0197] This embodiment corrects the prediction of the heat exchange medium temperature at a large air flow rate, and improves the accuracy of the heat exchange medium temperature prediction value at a large air flow rate by correction, reduces the sensor requirements, and thus reduces costs. This embodiment has a simple model, reliable calculation, high accuracy, and can simulate the outlet heat exchange medium temperature under different working conditions.

[0198] Based on the same inventive concept, Figure 6 The figure shows a schematic diagram of a device for determining the temperature of a heat exchange medium according to an embodiment of the present invention, comprising:

[0199] An acquisition module 601 is used to acquire the wall temperature of a heat exchange pipeline in contact with a heating element and the air temperature of air in contact with the heat exchange pipeline;

[0200] A first heat transfer resistance acquisition module 602 is used to calculate a first heat transfer resistance according to a first heat conduction resistance from a heating element to a wall of the heat exchange pipeline and a heat exchange medium convection heat transfer resistance of a heat exchange medium;

[0201] A second heat transfer resistance acquisition module 603, configured to calculate a second heat transfer resistance according to a second heat conduction resistance of the heat transfer structure between the heat exchange medium and the air and an air convection heat transfer resistance of the air;

[0202] The heat exchange medium temperature prediction module 604 is used to estimate the predicted value of the heat exchange medium temperature at the outlet of the heat exchange pipeline according to the pipe wall temperature and the air temperature, based on the first heat transfer resistance and the second heat transfer resistance.

[0203] The present invention obtains the tube wall temperature of the heat exchange pipeline in contact with the heating element and the air temperature of the air in contact with the heat exchange pipeline, and calculates the first heat transfer resistance according to the first heat conduction resistance from the heating element to the tube wall of the heat exchange pipeline and the heat exchange medium convection heat transfer resistance of the heat exchange medium, calculates the second heat transfer resistance according to the second heat conduction resistance of the heat transfer structure between the heat exchange medium and the air and the air convection heat transfer resistance of the air, and estimates the predicted value of the heat exchange medium temperature of the heat exchange medium based on the tube wall temperature and the air temperature and the first heat transfer resistance and the second heat transfer resistance. The present invention introduces a first heat conduction resistance between a heating element and the wall of the heat exchange pipeline, a heat exchange medium convection heat transfer resistance of the heat exchange medium, a second heat conduction resistance of the heat transfer structure between the heat exchange medium and the air, and an air convection heat transfer resistance of the air when estimating the temperature of the heat exchange medium by the wall temperature, thereby reducing the influence of the air on the estimation of the heat exchange medium temperature when estimating the heat exchange medium temperature by the wall temperature, thereby replacing the heat exchange medium temperature sensor with an algorithm, reducing costs and improving the accuracy of the estimated heat exchange medium temperature.

[0204] In one embodiment, the first heat transfer resistance is calculated based on the first heat conduction resistance between the heating element and the wall of the heat exchange pipeline and the heat exchange medium convection heat transfer resistance of the heat exchange medium, specifically including:

[0205] Obtaining a first heat conduction thermal resistance between the heating element and the wall of the heat exchange pipeline and obtaining a heat exchange medium convection heat transfer thermal resistance of the heat exchange medium;

[0206] The first heat transfer resistance between the heating element and the heat exchange medium is calculated as the sum of the first heat conduction resistance and the convection heat transfer resistance of the heat exchange medium.

[0207] In one embodiment, obtaining the heat exchange medium convection heat transfer thermal resistance of the heat exchange medium specifically includes:

[0208] The heat transfer resistance of the heat transfer medium is calculated as:

[0209] Among them, R 1,conv is the convective heat transfer resistance of the heat exchange medium, is the mass flow rate of the heat exchange medium, C 1w is the fitting parameter of the first heat exchange medium, C 2w is the fitting parameter of the second heat exchange medium, C 3w is the fitting parameter of the third heat exchange medium, A w It is the heat exchange area between the heating element and the heat exchange medium.

[0210] In one embodiment, the second heat transfer resistance is calculated based on the second heat conduction resistance of the heat transfer structure between the heat exchange medium and the air and the air convection heat transfer resistance of the air, specifically including:

[0211] Obtaining a second heat conduction thermal resistance of a heat transfer structure between the heat exchange medium and the air and obtaining the air convection heat transfer thermal resistance;

[0212] The second heat transfer resistance between the heat exchange medium and the air is calculated as the sum of the second heat conduction resistance and the air convection heat transfer resistance.

[0213] In one embodiment, obtaining the air convection heat transfer thermal resistance specifically includes:

[0214] The air convection heat transfer thermal resistance is calculated as:

[0215] Among them, R 2,conv is the air convection heat transfer thermal resistance, is the air mass flow rate, C 1a is the first air fitting parameter, C 2a is the second air fitting parameter, C 3a is the third air fitting parameter, A a It is the heat exchange area between the heat transfer structure between the heat exchange medium and the air.

[0216] In one embodiment, the estimating the predicted value of the heat exchange medium temperature at the outlet of the heat exchange pipeline based on the first heat transfer resistance and the second heat transfer resistance according to the pipe wall temperature and the air temperature specifically includes:

[0217] The predicted value of the heat exchange medium temperature of the heat exchange medium is calculated as: Where T water is the predicted value of the heat exchange medium temperature, T test is the tube wall temperature, T air is the air temperature, R 1 is the first heat transfer resistance, R 2 is the second heat transfer thermal resistance, and the first heat transfer thermal resistance and the second heat transfer thermal resistance are obtained by fitting the test value of the heat exchange medium temperature at the outlet of the heat exchange pipeline in the experimental test and the predicted value of the heat exchange medium temperature.

[0218] In one embodiment, obtaining the tube wall temperature of the heat exchange pipeline in contact with the heating element and the air temperature of the air in contact with the heat exchange pipeline specifically includes:

[0219] Calculate the heat transfer sufficiency coefficient according to the heat transfer coefficient of the heat transfer medium and the mass flow rate of the heat transfer medium;

[0220] According to the heat transfer sufficiency coefficient, judging whether the heating element meets the replacement condition;

[0221] If the heating element meets the replacement condition, the tube wall temperature of the heat exchange pipeline in contact with the heating element and the air temperature of the air in contact with the heat exchange pipeline are obtained.

[0222] In one embodiment, the heat transfer coefficient is: Wherein, N is the heat transfer coefficient, e is the natural constant, α w is the heat transfer coefficient of the heat transfer medium, A w is the heat exchange area between the heating element and the heat exchange medium, is the mass flow rate of the heat exchange medium, and Cp is the constant pressure specific heat of the heat exchange medium.

[0223] In one embodiment, the alternative condition is:

[0224] If the heating element satisfies |ΔT·N|<|T at any flow rate Tolerence |, then it is judged that the heating element meets the replacement condition, otherwise it is judged that the heating element does not meet the replacement condition, where △T is the common difference between the heat exchange medium temperature and the tube wall temperature of the heating element, T Tolerence is the prediction error accuracy, and N is the heat transfer sufficiency coefficient.

[0225] Regarding the device in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated here.

[0226] like Figure 7 The figure shows a hardware structure diagram of an electronic device of the present invention, including:

[0227] at least one processor 701; and,

[0228] A memory 702 that is communicatively connected to at least one of the processors 701; wherein,

[0229] The memory 702 stores instructions that can be executed by at least one of the processors. The instructions are executed by at least one of the processors so that the at least one of the processors can execute the method for determining the temperature of the heat exchange medium as described above.

[0230] Figure 7 A processor 701 is taken as an example.

[0231] The electronic device may further include: an input device 703 and a display device 704 .

[0232] The processor 701, the memory 702, the input device 703 and the display device 704 may be connected via a bus or other means, and the figure takes the connection via a bus as an example.

[0233] The memory 702 is a non-volatile computer-readable storage medium that can be used to store non-volatile software programs, non-volatile computer executable programs and modules, such as program instructions / modules corresponding to the method for determining the temperature of the heat exchange medium in the embodiment of the present application, for example, Figure 1 , Figure 2 The processor 701 executes various functional applications and data processing by running the non-volatile software programs, instructions and modules stored in the memory 702, that is, the method for determining the temperature of the heat exchange medium in the above embodiment is implemented.

[0234] The memory 702 may include a program storage area and a data storage area, wherein the program storage area may store an operating system and application programs required for at least one function; the data storage area may store data created according to the use of the method for determining the temperature of the heat exchange medium, etc. In addition, the memory 702 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage device. In some embodiments, the memory 702 may optionally include a memory remotely arranged relative to the processor 701, and these remote memories may be connected to the device for executing the method for determining the temperature of the heat exchange medium via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0235] The input device 703 can receive user clicks and generate signal inputs related to user settings and function control of the method for determining the temperature of the heat exchange medium. The display device 704 can include display devices such as a display screen.

[0236] The one or more modules are stored in the memory 702 , and when executed by the one or more processors 701 , the method for determining the temperature of the heat exchange medium in any of the above method embodiments is executed.

[0237] The present invention obtains the tube wall temperature of the heat exchange pipeline in contact with the heating element and the air temperature of the air in contact with the heat exchange pipeline, and calculates the first heat transfer resistance according to the first heat conduction resistance from the heating element to the tube wall of the heat exchange pipeline and the heat exchange medium convection heat transfer resistance of the heat exchange medium, calculates the second heat transfer resistance according to the second heat conduction resistance of the heat transfer structure between the heat exchange medium and the air and the air convection heat transfer resistance of the air, and estimates the predicted value of the heat exchange medium temperature of the heat exchange medium based on the tube wall temperature and the air temperature and the first heat transfer resistance and the second heat transfer resistance. The present invention introduces a first heat conduction resistance between a heating element and the wall of the heat exchange pipeline, a heat exchange medium convection heat transfer resistance of the heat exchange medium, a second heat conduction resistance of the heat transfer structure between the heat exchange medium and the air, and an air convection heat transfer resistance of the air when estimating the temperature of the heat exchange medium by the wall temperature, thereby reducing the influence of the air on the estimation of the heat exchange medium temperature when estimating the heat exchange medium temperature by the wall temperature, thereby replacing the heat exchange medium temperature sensor with an algorithm, reducing costs and improving the accuracy of the estimated heat exchange medium temperature.

[0238] An embodiment of the present invention provides a storage medium, wherein the storage medium stores computer instructions. When a computer executes the computer instructions, the storage medium is used to execute all steps of the method for determining the temperature of a heat exchange medium as described above.

[0239] In the context of the present disclosure, a storage medium may be a tangible medium that may contain or store a program for use by or in conjunction with an instruction execution system, device, or apparatus. The storage medium may be a machine-readable signal medium or a machine-readable storage medium. Alternatively, the storage medium may be a non-temporary computer-readable storage medium, for example, a non-temporary computer-readable storage medium may be a ROM, a random access memory (Random Access Memory, RAM), a compact disc read-only memory (Compact Disc ROM, CD-ROM), a magnetic tape, a floppy disk, and an optical data storage device, etc.

[0240] An embodiment of the present invention provides a vehicle, including the device for determining the temperature of a heat exchange medium as described above, or the electronic device as described above. It is understandable that the vehicle may also include: a processor, a memory, and a computer program. The computer program is stored in the memory and is configured to be executed by the processor to implement the method for determining the temperature of a heat exchange medium provided in the embodiment of the present disclosure. The processor and the memory are already in Figure 7 The parts described in the illustrated embodiment are not repeated here.

[0241] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A method for determining the temperature of a heat exchange medium, characterized in that: include: Acquiring the tube wall temperature of the heat exchange pipeline in contact with the heating element and the air temperature of the air in contact with the heat exchange pipeline; Calculating a first heat transfer resistance according to a first heat conduction resistance between the heating element and the wall of the heat exchange pipeline and a heat exchange medium convection heat transfer resistance of the heat exchange medium; calculating a second heat transfer resistance according to a second heat conduction resistance of a heat transfer structure between the heat exchange medium and the air and an air convection heat transfer resistance of the air; According to the tube wall temperature and the air temperature, a predicted value of the heat exchange medium temperature at the outlet of the heat exchange pipeline is estimated based on the first heat transfer thermal resistance and the second heat transfer thermal resistance.

2. The method for determining the temperature of a heat exchange medium according to claim 1, characterized in that: The first heat transfer resistance is calculated based on the first heat conduction resistance between the heating element and the wall of the heat exchange pipeline and the heat exchange medium convection heat transfer resistance of the heat exchange medium, specifically including: Obtaining a first heat conduction thermal resistance between the heating element and the wall of the heat exchange pipeline and obtaining a heat exchange medium convection heat transfer thermal resistance of the heat exchange medium; The first heat transfer resistance between the heating element and the heat exchange medium is calculated as the sum of the first heat conduction resistance and the convection heat transfer resistance of the heat exchange medium.

3. The method for determining the temperature of a heat exchange medium according to claim 2, characterized in that: The obtaining of the heat exchange medium convection heat transfer thermal resistance of the heat exchange medium specifically includes: The heat transfer resistance of the heat transfer medium is calculated as: Among them, R 1,conv is the convective heat transfer resistance of the heat exchange medium, is the mass flow rate of the heat exchange medium, C 1w is the fitting parameter of the first heat exchange medium, C 2w is the fitting parameter of the second heat exchange medium, C 3w is the fitting parameter of the third heat exchange medium, A w It is the heat exchange area between the heating element and the heat exchange medium.

4. The method for determining the temperature of a heat exchange medium according to claim 1, characterized in that: The calculating the second heat transfer resistance according to the second heat conduction resistance of the heat transfer structure between the heat exchange medium and the air and the air convection heat transfer resistance of the air specifically includes: Obtaining a second heat conduction thermal resistance of a heat transfer structure between the heat exchange medium and the air and obtaining the air convection heat transfer thermal resistance; The second heat transfer resistance between the heat exchange medium and the air is calculated as the sum of the second heat conduction resistance and the air convection heat transfer resistance.

5. The method for determining the temperature of a heat exchange medium according to claim 4, characterized in that: The obtaining of the air convection heat transfer thermal resistance specifically includes: The air convection heat transfer thermal resistance is calculated as: Among them, R 2,conv is the air convection heat transfer thermal resistance, is the air mass flow rate, C 1a is the first air fitting parameter, C 2a is the second air fitting parameter, C 3a is the third air fitting parameter, A a It is the heat exchange area between the heat transfer structure between the heat exchange medium and the air.

6. The method for determining the temperature of a heat exchange medium according to claim 1, characterized in that: The method of estimating a predicted value of the heat exchange medium temperature at the outlet of the heat exchange pipeline based on the first heat transfer resistance and the second heat transfer resistance according to the pipe wall temperature and the air temperature specifically includes: The predicted value of the heat exchange medium temperature of the heat exchange medium is calculated as: Where T water is the predicted value of the heat exchange medium temperature, T test is the tube wall temperature, T air is the air temperature, R1 is the first heat transfer resistance, and R2 is the second heat transfer resistance.

7. The method for determining the temperature of a heat exchange medium according to claim 1, characterized in that: The obtaining of the wall temperature of the heat exchange pipe in contact with the heating element and the air temperature of the air specifically includes: Calculate the heat transfer sufficiency coefficient according to the heat transfer coefficient of the heat transfer medium and the mass flow rate of the heat transfer medium; According to the heat transfer sufficiency coefficient, judging whether the heating element meets the replacement condition; If the heating element meets the replacement condition, the wall temperature of the heat exchange pipeline in contact with the heating element and the air temperature of the air are obtained.

8. The method for determining the temperature of a heat exchange medium according to claim 7, characterized in that: The heat transfer coefficient is: Wherein, N is the heat transfer coefficient, e is the natural constant, α w is the heat transfer coefficient of the heat transfer medium, A w is the heat exchange area between the heating element and the heat exchange medium, is the mass flow rate of the heat exchange medium, and Cp is the constant pressure specific heat of the heat exchange medium.

9. The method for determining the temperature of a heat exchange medium according to claim 7, characterized in that: The alternative conditions are: If the heating element satisfies |ΔT·N|<|T at any flow rate Tolerence |, then it is judged that the heating element meets the replacement condition, otherwise it is judged that the heating element does not meet the replacement condition, where △T is the common difference between the heat exchange medium temperature and the wall temperature of the heating element, T Tolerence is the prediction error accuracy, and N is the heat transfer sufficiency coefficient.

10. A device for determining the temperature of a heat exchange medium, characterized in that: include: An acquisition module, used to acquire the tube wall temperature of the heat exchange pipeline in contact with the heating element and the air temperature of the air in contact with the heat exchange pipeline; A first heat transfer resistance acquisition module, used for calculating a first heat transfer resistance according to a first heat conduction resistance from a heating element to a pipe wall of the heat exchange pipeline and a heat exchange medium convection heat transfer resistance of a heat exchange medium; A second heat transfer resistance acquisition module, used for calculating a second heat transfer resistance according to a second heat conduction resistance of the heat transfer structure between the heat exchange medium and the air and an air convection heat transfer resistance of the air; A heat exchange medium temperature prediction module is used to estimate a predicted value of the heat exchange medium temperature at the outlet of the heat exchange pipeline based on the tube wall temperature and the air temperature and based on the first heat transfer thermal resistance and the second heat transfer thermal resistance.

11. An electronic device, characterized in that: include: at least one processor; as well as, a memory communicatively connected to at least one of the processors; wherein, The memory stores instructions that can be executed by at least one of the processors, and the instructions are executed by at least one of the processors to enable at least one of the processors to perform the method for determining the temperature of a heat exchange medium according to any one of claims 1 to 9.

12. A storage medium, characterized in that: The storage medium stores computer instructions, and when a computer executes the computer instructions, it is used to execute all steps of the method for determining the temperature of a heat exchange medium according to any one of claims 1 to 9.

13. A vehicle, characterized in that: It comprises the device for determining the temperature of the heat exchange medium as claimed in claim 10, or the electronic device as claimed in claim 11.

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