Heat exchange medium temperature determination method and device, electronic equipment, storage medium and vehicle

Abstract

The application discloses a heat exchange medium temperature determination method, device, electronic equipment, storage medium and vehicle. The method comprises the following steps: acquiring a pipe wall temperature of a heat exchange pipeline in contact with a heating element and an air temperature of air in contact with the heat exchange pipeline; calculating a first heat transfer thermal resistance according to a first heat conduction thermal resistance between the heating element and the heat exchange pipeline pipe wall and a heat exchange medium convection heat transfer thermal resistance of the heat exchange medium; calculating a second heat transfer thermal resistance according to a second heat conduction thermal resistance of a heat transfer structure between the heat exchange medium and the air and an air convection heat transfer thermal resistance of the air; and estimating a heat exchange medium temperature prediction value of the heat exchange medium according to the pipe wall temperature and the air temperature based on the first heat transfer thermal resistance and the second heat transfer thermal resistance. The application reduces the influence of air on the heat exchange medium temperature estimation when the heat exchange medium temperature is estimated by the pipe wall temperature, thereby replacing the heat exchange medium temperature sensor by an algorithm, reducing the cost and improving the accuracy of the estimated heat exchange medium temperature.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicles, and particularly relates to a heat exchange medium temperature determination method and device, electronic equipment, storage medium and vehicle. BACKGROUND

[0002] When heat is dissipated from a heat generating element, such as a driving motor, a generator or the like of a vehicle, a temperature sensor is usually arranged to measure the temperature of the heat generating element. In addition, the heat generating element is connected to a heat sink, and heat is conducted through water in the heat sink to dissipate heat.

[0003] In order to monitor the temperature of the heat exchange medium in the heat exchange pipeline, such as monitoring 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, the temperature of the heat exchange medium in the pipeline needs to be monitored.

[0004] In order to reduce costs, the temperature of the heat exchange medium can be estimated by using the temperature of the heat exchange pipeline wall of the heat sink connected to the heat generating element through a thermal resistance model of the heat generating element, thereby reducing the use of heat exchange medium temperature sensors.

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

[0006] Therefore, the prior art has the technical problem of a large error when the air flow speed is high when estimating the temperature of the heat exchange medium by using the temperature of the heat exchange pipeline wall. SUMMARY

[0007] Therefore, it is necessary to provide a heat exchange medium temperature determination method and device, electronic equipment, storage medium and vehicle to solve the technical problem of a large error when the air flow speed is high when estimating the temperature of the heat exchange medium by using the temperature of the heat exchange pipeline wall in the prior art.

[0008] The present application provides a heat exchange medium temperature determination method, comprising:

[0009] obtaining the temperature of the pipeline wall of the heat exchange pipeline in contact with the heat generating element and the air temperature of the air in contact with the heat exchange pipeline;

[0010] The first heat transfer thermal resistance is calculated according to a first heat conduction thermal resistance between the heat generating element and the wall of the heat exchange pipeline and a heat exchange medium convection heat exchange thermal resistance of the heat exchange medium, and the second heat transfer thermal resistance is calculated according to a second heat conduction thermal resistance of a heat transfer structure between the heat exchange medium and the air and an air convection heat exchange thermal resistance of the air;

[0011] The heat exchange medium temperature prediction value 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 according to the wall temperature and the air temperature.

[0012] Further, the first heat transfer thermal resistance is calculated according to a first heat conduction thermal resistance between the heat generating element and the wall of the heat exchange pipeline and a heat exchange medium convection heat exchange thermal resistance of the heat exchange medium, and the second heat transfer thermal resistance is calculated according to a second heat conduction thermal resistance of a heat transfer structure between the heat exchange medium and the air and an air convection heat exchange thermal resistance of the air.

[0013] The first heat conduction thermal resistance between the heat generating element and the wall of the heat exchange pipeline and the heat exchange medium convection heat exchange thermal resistance of the heat exchange medium are obtained.

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

[0015] Further, the heat exchange medium convection heat exchange thermal resistance of the heat exchange medium is obtained, and specifically includes:

[0016] The heat exchange medium convection heat exchange thermal resistance of the heat exchange medium is calculated as:

[0017] wherein R 1,conv is the heat exchange medium convection heat exchange thermal resistance, is the heat exchange medium mass flow, C 1w is a first heat exchange medium fitting parameter, C 2w is a second heat exchange medium fitting parameter, C 3w is a third heat exchange medium fitting parameter, A w is a heat exchange area of the heat generating element and the heat exchange medium.

[0018] Further, the second heat transfer thermal resistance is calculated according to a second heat conduction thermal resistance of a heat transfer structure between the heat exchange medium and the air and an air convection heat exchange thermal resistance of the air.

[0019] The second heat conduction thermal resistance of the heat transfer structure between the heat exchange medium and the air and the air convection heat exchange thermal resistance are obtained.

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

[0021] Further, the air convection heat transfer thermal resistance is obtained, and specifically includes the following steps.

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

[0023] wherein R 2,conv is the air convection heat transfer thermal resistance, is the air mass flow, 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 is the heat transfer area between the heat transfer medium and the air.

[0024] Further, the heat transfer medium temperature prediction value at the outlet of the heat transfer pipeline is estimated based on the first heat transfer thermal resistance and the second heat transfer thermal resistance according to the pipe wall temperature and the air temperature, and specifically includes the following steps.

[0025] The heat transfer medium temperature prediction value of the heat transfer medium is calculated as follows: wherein T water is the heat transfer medium temperature prediction value, T test is the pipe wall temperature, T air is the air temperature, R1 is the first heat transfer thermal resistance, and R2 is the second heat transfer thermal resistance.

[0026] Further, the pipe wall temperature of the heat transfer pipeline in contact with the heat generating element and the air temperature of the air in contact with the heat transfer pipeline are obtained, and specifically includes the following steps.

[0027] The heat transfer sufficiency coefficient is calculated according to the heat transfer medium heat transfer coefficient of the heat transfer medium and the heat transfer medium mass flow;

[0028] It is determined whether the heat generating element meets the replacement condition according to the heat transfer sufficiency coefficient.

[0029] If the heat generating element meets the replacement condition, the pipe wall temperature of the heat transfer pipeline in contact with the heat generating element and the air temperature of the air in contact with the heat transfer pipeline are obtained.

[0030] Further, the heat transfer sufficiency coefficient is as follows: wherein N is the heat transfer sufficiency coefficient, e is a natural constant, α w is the heat transfer medium heat transfer coefficient, A w is the heat transfer area between the heat generating element and the heat transfer medium, is the heat transfer medium mass flow, and Cp is the specific heat at constant pressure of the heat transfer medium.

[0031] Further, the alternative condition is:

[0032] If the heating element satisfies |ΔT·N|<|T Tolerence | under any flow rate, it is judged that the heating element satisfies the alternative condition, otherwise it is judged that the heating element does not satisfy the alternative condition, wherein, ΔT is the common difference between the heat transfer medium temperature and the pipe wall temperature of the heating element, T Tolerence is the prediction error accuracy, and N is the heat transfer sufficiency coefficient.

[0033] The application provides a heat transfer medium temperature determination device, comprising:

[0034] An acquisition module is configured to acquire the pipe wall temperature of a heat transfer pipeline in contact with a heating element and the air temperature of air in contact with the heat transfer pipeline;

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

[0036] A heat transfer medium temperature prediction module is configured to estimate the heat transfer medium temperature prediction value at the outlet of the heat transfer pipeline based on the first heat transfer thermal resistance and the second heat transfer thermal resistance according to the pipe wall temperature and the air temperature.

[0037] The application provides an electronic device, comprising:

[0038] at least one processor; and

[0039] a memory in communication connection with the at least one processor; wherein

[0040] The memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to execute the heat transfer medium temperature determination method as described above.

[0041] The application provides a storage medium storing computer instructions, when the computer executes the computer instructions, all steps of the heat transfer medium temperature determination method as described above are executed.

[0042] The application provides a vehicle comprising the heat transfer medium temperature determination device as described above or the electronic device as described above.

[0043] The application obtains the pipe 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 thermal resistance according to the first heat conduction thermal resistance between the heating element and the pipe wall of the heat exchange pipeline and the heat exchange medium convective heat transfer thermal resistance of the heat exchange medium, calculates the second heat transfer thermal resistance according to the second heat conduction thermal resistance of the heat transfer structure between the heat exchange medium and the air and the air convective heat transfer thermal resistance of the air, and estimates the heat exchange medium temperature prediction value of the heat exchange medium based on the first heat transfer thermal resistance and the second heat transfer thermal resistance through the pipe wall temperature and the air temperature. When the heat exchange medium temperature is estimated, the first heat conduction thermal resistance between the heating element and the pipe wall of the heat exchange pipeline, the heat exchange medium convective heat transfer thermal resistance of the heat exchange medium, the second heat conduction thermal resistance of the heat transfer structure between the heat exchange medium and the air and the air convective heat transfer thermal resistance of the air are introduced, the influence of the air on the heat exchange medium temperature estimation when the heat exchange medium temperature is estimated through the pipe wall temperature is reduced, so that the heat exchange medium temperature sensor is replaced by the algorithm, the cost is reduced, and the accuracy of the estimated heat exchange medium temperature is improved. BRIEF DESCRIPTION OF DRAWINGS

[0044] Figure 1 The working flow chart of the heat exchange medium temperature determination method is shown in an embodiment of the application.

[0045] Figure 2 The working flow chart of the heat exchange medium temperature determination method is shown in another embodiment of the application.

[0046] Figure 3 The heat exchange pipeline flow model building schematic diagram is shown in an example of the application.

[0047] Figure 4 The sufficient heat exchange coefficient curve schematic diagram is shown in an example of the application.

[0048] Figure 5 The calculation effect schematic diagram is shown in an example of the application.

[0049] Figure 6 The schematic diagram of the heat exchange medium temperature determination device is shown in an embodiment of the application.

[0050] Figure 7 The hardware structure schematic diagram of the electronic equipment is shown in the application. DETAILED DESCRIPTION

[0051] The specific embodiments of the application will be further described below in combination with the drawings. Wherein the same parts are denoted by the same reference numerals. It should be noted that the words "front", "back", "left", "right", "up" and "down" used in the following description refer to the directions in the drawings, and the words "in" and "out" refer to the directions towards or away from the geometric center of a particular part.

[0052] As Figure 1 Fig. 1 shows a flow chart of a method for determining the temperature of a heat exchange medium according to an embodiment of the present application, which comprises the following steps:

[0053] In step S101, the temperature of the pipe wall of the heat exchange pipeline in contact with the heat generating element and the air temperature of the air in contact with the heat exchange pipeline are obtained.

[0054] In step S102, the first heat transfer resistance is calculated according to the first heat conduction thermal resistance between the heat generating element and the pipe wall of the heat exchange pipeline and the heat exchange medium convective heat transfer thermal resistance of the heat exchange medium.

[0055] In step S103, the second heat transfer resistance is calculated according to the second heat conduction thermal resistance of the heat transfer structure between the heat exchange medium and the air and the air convective heat transfer thermal resistance of the air.

[0056] In step S104, the heat exchange medium temperature prediction value at the outlet of the heat exchange pipeline is estimated based on the first heat transfer resistance and the second heat transfer resistance according to the pipe wall temperature and the air temperature.

[0057] Specifically, the present application can be applied to electronic devices with processing capabilities, such as electronic controller units (ECU) or extended domain control units (XCU) of vehicles.

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

[0059] In some embodiments, the heat generating element is a heat generating element for air cooling and liquid cooling in a vehicle, including but not limited to: drive motor, generator, etc. Specifically, the heat generating element can be blown by a fan for air cooling, and a heat exchange pipeline passes through a heat exchange medium for heat dissipation. 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 heat generating element exchanges heat with the heat exchange medium and air. The heat exchange process of the heat generating element is in the form of: heat source of the heat generating element -> first heat transfer structure -> internal measurement sensor of the heat generating element -> second heat transfer structure -> heat exchange medium -> third heat transfer structure -> air.

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

[0062] Then, step S102 is executed to calculate the first thermal transfer resistance based on the first thermal conductivity resistance between the heating element (including the heating element) and the wall of the heat exchange pipeline (including the wall) and the convective thermal transfer resistance of the heat exchange medium. Then, step S103 is executed to calculate the second thermal transfer resistance based on the second thermal conductivity resistance of the heat transfer structure between the heat exchange medium and the air and the convective thermal transfer resistance of the air. Steps S102 and S103 can be interchanged or executed in parallel.

[0063] Finally, step S104 is executed, and the predicted value of the heat exchange medium temperature at the outlet of the heat exchange pipeline is estimated based on the pipe wall temperature and the air temperature, using the first heat transfer resistance and the second heat transfer resistance.

[0064] This invention obtains the pipe 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. Based on the first thermal conductivity resistance between the heating element and the pipe wall of the heat exchange pipeline and the convective thermal resistance of the heat exchange medium, a first thermal transfer resistance is calculated. Based on the second thermal conductivity resistance of the heat transfer structure between the heat exchange medium and the air and the convective thermal resistance of the air, a second thermal transfer resistance is calculated. Using the pipe wall temperature and the air temperature, and based on the first thermal transfer resistance and the second thermal transfer resistance, a predicted value of the heat exchange medium temperature is estimated. This invention introduces a first thermal conduction resistance between the heating element and the wall of the heat exchange pipeline, a convective thermal resistance of the heat exchange medium, a second thermal conduction resistance of the heat transfer structure between the heat exchange medium and the air, and an air convective thermal resistance of the air when estimating the temperature of the heat exchange medium through the pipe wall temperature. This reduces the influence of air on the estimation of the heat exchange medium temperature when estimating the temperature of the heat exchange medium through the pipe wall temperature. As a result, the invention replaces the heat exchange medium temperature sensor with an algorithm, thereby reducing costs and improving the accuracy of the estimated heat exchange medium temperature.

[0065] like Figure 2 The diagram shown is a flowchart of a method for determining the temperature of a heat exchange medium according to another embodiment of the present invention, including:

[0066] Step S201: Calculate the heat transfer efficiency coefficient based on the heat transfer coefficient and mass flow rate of the heat transfer medium.

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

[0068] Step S202, judging whether the heat generating element meets the replacement condition according to the heat exchange sufficiency coefficient.

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

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

[0071] Step S203, if the heat generating element meets the replacement condition, obtaining the pipe wall temperature of the heat exchange pipeline in contact with the heat generating element and the air temperature of the air in contact with the heat exchange pipeline.

[0072] Step S204, calculating the first heat transfer thermal resistance according to the first thermal conduction thermal resistance between the heat generating element and the heat exchange pipeline pipe wall and the heat exchange medium convection heat transfer thermal resistance of the heat exchange medium.

[0073] In one embodiment, the calculation of the first heat transfer thermal resistance according to the first thermal conduction thermal resistance between the heat generating element and the heat exchange pipeline pipe wall and the heat exchange medium convection heat transfer thermal resistance of the heat exchange medium specifically includes:

[0074] Obtaining the first thermal conduction thermal resistance between the heat generating element and the heat exchange pipeline pipe wall and obtaining the heat exchange medium convection heat transfer thermal resistance of the heat exchange medium.

[0075] Calculating the first heat transfer thermal resistance between the heat generating element and the heat exchange medium as the sum of the first thermal conduction thermal resistance and the heat exchange medium convection heat transfer thermal resistance.

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

[0077] Calculating the heat exchange medium convection heat transfer thermal resistance of the heat exchange medium as:

[0078] Where R 1,conv is the heat exchange medium convection heat transfer thermal resistance, is the heat exchange medium mass flow rate, C 1w is the first heat exchange medium fitting parameter, C 2w is the second heat exchange medium fitting parameter, C 3w is the third heat exchange medium fitting parameter, and A w is the heat exchange area between the heat generating element and the heat exchange medium.

[0079] In step S205, a second heat transfer thermal resistance is calculated according to a second heat conduction thermal resistance of a heat transfer structure between the heat transfer medium and the air and an air convection heat transfer thermal resistance of the air.

[0080] In one embodiment, the second heat transfer thermal resistance is calculated according to the second heat conduction thermal resistance of the heat transfer structure between the heat transfer medium and the air and the air convection heat transfer thermal resistance of the air, specifically comprising:

[0081] The second heat conduction thermal resistance of the heat transfer structure between the heat transfer medium and the air and the air convection heat transfer thermal resistance are obtained.

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

[0083] In one embodiment, the air convection heat transfer thermal resistance is obtained, specifically comprising:

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

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

[0086] In step S206, a heat transfer medium temperature prediction value at an outlet of the heat transfer pipeline is estimated based on the first heat transfer thermal resistance and the second heat transfer thermal resistance according to the tube wall temperature and the air temperature.

[0087] In one embodiment, the heat transfer medium temperature prediction value at the outlet of the heat transfer pipeline is estimated based on the first heat transfer thermal resistance and the second heat transfer thermal resistance according to the tube wall temperature and the air temperature, specifically comprising:

[0088] The heat transfer medium temperature prediction value of the heat transfer medium is calculated as: wherein T water is the heat transfer medium temperature prediction value, T test is the tube wall temperature, T air is the air temperature, R1 is the first heat transfer thermal resistance, and R2 is the second heat transfer thermal resistance.

[0089] Specifically, first, step S201 is performed to calculate a heat exchange sufficiency coefficient according to a heat exchange medium heat exchange coefficient of the heat exchange medium and a heat exchange medium mass flow rate.

[0090] Specifically, the heat exchange medium heat exchange coefficient and the heat exchange medium mass flow rate are determined in the prior art manner, for example, the water heat exchange coefficient and the water mass flow rate are determined in the prior art manner.

[0091] In some embodiments, a heat exchange pipeline flow model is built by a neural network model to obtain the heat exchange medium mass flow rate, for example, the water mass flow rate, of the heat generating element under different working conditions.

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

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

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

[0095] 1. Key flow data in the experiment is obtained, parameters such as water pump pressure rise, component pressure drop and along-the-way loss are corrected, a physical model is built, and the key experimental data is corrected.

[0096] 2. The physical model is built according to the experimental data, and the experimental data is expanded. This step can calculate the branch flow that is not measured in the experiment but is related to the simulation. Specifically, the physical model is built by using the GT Power software. Then, a mapping database is obtained through Design of Experiment (DOE). The mapping database can be regarded as a large number of mapping data corresponding to the input-output, and a neural network model can be built.

[0097] 3. On the basis of the data obtained in step 2, the control quantities in the system are taken as modeling features, and the features are expanded according to the physical meaning, as shown in Table 1. The expansion basis can be the step relationship between the water pump speed and the lift, the temperature and the radiant heat exchange, and the instantaneous energy and the cumulative energy entering the system

[0098]

[0099] Feature selection is performed on the basis of extended features, and the selection manner is based on a general neural network GRNN of joint probability distribution.

[0100] The screening process is as follows:

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

[0102] 4.2 Approximate the output value by using the features in the candidate set through GRNN, traverse the features in the candidate set, and select the feature with the smallest mean squared error (MSE) into the selected set;

[0103] 4.3 Enter the iteration process, and the fitting target is changed to the remaining information after fitting the output value by using the features in the selected set, and the feature with the smallest MSE is selected into the selected set;

[0104] 4.4 Iteration in turn until the features in the candidate set are traversed.

[0105] GRNN is based on probability, which 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 result, the first four features are selected to reduce the GRNN fitting MSE to 0, that is, to ensure the accuracy and avoid feature redundancy.

[0107] 6. The data obtained in step 2 is randomly divided into training set and test set, and a neural network model is established according to the selected features, and the accuracy of the model is obtained by K test, and the best flow model is selected according to the training accuracy and test accuracy, that is, Figure 3 Flow static model.

[0108] 7. Build a steady-state heat exchange model of the heat exchange component in the system, and the heat absorbed under the steady-state condition causes the temperature change

[0109]

[0110] The heat sources are heating elements and 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 Qabs is the absorbed heat, C p The specific heat at constant pressure of the heat exchange medium, The mass flow rate of the cooling heat exchange medium, T w The temperature of the heat exchange medium, T B The temperature of the heat generating element, L C The characteristic length of the heat exchange component, representing the heat exchange area corresponding to each unit length, a w The heat exchange coefficient of the heat exchange medium, dA w The differential of the heat exchange area of the heat exchange medium, dx is the differential of the heat exchange length. The formula (1) and formula (2) are combined and integrated from the length of the inlet to the outlet of the heat exchange component to obtain

[0113]

[0114] Because the thermal mass of the heat exchange component is large relative to the heat exchange amount in a unit step, it can be considered that the temperature of the heat exchange component in a unit step does not change.

[0115] 8. The heat exchange coefficient is fitted according to the mass flow rate, and it is ensured that the heat exchange coefficient in the heat exchange pipeline is within a reasonable range, and the trend is correct

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

[0117] 10. The characteristic length of the heat exchange element is identified through experimental data, the deficiency of the flow progress is compensated, and the flow model is calibrated. The flow dynamic model as shown in Figure 3 is obtained. The flow dynamic model is a model obtained by adding filtering to the static model of the neural network. According to the flow dynamic model, the heat exchange medium mass flow rate of the heat generating element under different working conditions can be determined.

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

[0119] The heat exchange coefficient of the heat exchange medium can be fitted by a second-order polynomial, and the formula is as follows:

[0120]

[0121] Where a w is the heat exchange coefficient of the heat exchange medium, is the heat exchange medium mass flow rate, C 1w , C 2w , C 3ware fitting coefficients that need to be fitted to experimental values.

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

[0123]

[0124] The Nusselt number is calculated as:

[0125]

[0126] In the equation, a 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. The air heat transfer coefficient can then be calculated as:

[0127]

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

[0129] Then, the heat transfer sufficiency coefficient is calculated based on 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 sufficiency coefficient is: In the equation, N is the heat transfer sufficiency coefficient, e is the natural constant, a w is the heat transfer coefficient of the heat transfer medium, A w is the heat transfer area of the heat generating element and the heat transfer medium, is the mass flow rate of the heat transfer medium, and Cp is the specific heat at constant pressure of the heat transfer medium.

[0131] Specifically, the heat transfer sufficiency coefficient is calculated using equation (8) based on the air heat transfer coefficient and the air mass flow rate, and a heat transfer sufficiency coefficient curve can be drawn.

[0132]

[0133] In the equation, N is the heat transfer sufficiency coefficient, e is the natural constant, a w is the heat transfer coefficient of the heat transfer medium, A w is the heat transfer area of the heat generating element and the heat transfer medium, is the mass flow rate of the heat transfer medium, and Cp is the specific heat at constant pressure of the heat transfer medium.

[0134] The heat transfer sufficiency coefficient describes the ratio of the outlet temperature difference and the inlet temperature difference of the heat transfer process, which depends on the flow rate and the physical size characteristics of the heat transfer, i.e. the heat transfer area in the pipeline. For example,Figure 4 The heat exchange sufficient coefficient curve 41 of the heating element a, the heat exchange sufficient coefficient curve 42 of the heating element b and the heat exchange sufficient coefficient curve 43 of the heating element c are shown.

[0135] The embodiment provides a calculation method of the heat exchange sufficient coefficient.

[0136] Then, step S202 is performed, and whether the heating element meets the replacement condition is judged according to the heat exchange sufficient coefficient.

[0137] In one of the embodiments, the replacement condition is:

[0138] If the heating element meets |ΔT·N|<|T Tolerence | under any flow, 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, wherein ΔT is the common difference of the heat exchange medium temperature and the pipe wall temperature of the heating element, T Tolerence is the prediction error accuracy, and N is the heat exchange sufficient coefficient.

[0139] As shown in the formula (8), the heat exchange sufficient coefficient N of the heating element is calculated according to the heat exchange medium temperature and the pipe wall temperature of the heating element under different flow. Figure 4 The heating element screening is described by taking the heating element a, the heating element b and the heating element c as examples. The heating element using the virtual temperature sensor to replace the real sensor is determined according to the sufficient heat exchange coefficient curve and the virtual temperature error range.

[0140] |ΔT·N|<|T Tolerence | (9)

[0141] Wherein ΔT is the common difference of the heat exchange medium temperature and the pipe wall temperature of the heating element, T Tolerence is the prediction error accuracy, and N is the heat exchange sufficient coefficient.

[0142] Specifically, under different flow, the absolute value |ΔT·N| of the common difference of the heat exchange medium temperature and the pipe wall temperature of the heating element is less than the absolute value |T Tolerence | of the prediction error accuracy, and it is considered that the heating element c can calculate the downstream test heat exchange medium temperature, that is, the heat exchange medium temperature at the outlet of the heat exchange pipeline, by using the test pipe wall temperature.

[0143] As shown in the formula (8), the heat exchange sufficient coefficient N of the heating element is calculated according to the heat exchange medium temperature and the pipe wall temperature of the heating element under different flow. Figure 4 Wherein the common difference ΔT of the heat exchange medium temperature and the pipe wall temperature of the heating element c in the cooling process can be obtained through big data. The prediction error accuracy is not more than T Tolerence , and the formula (9) is met under different flow, it is considered that the heating element c can calculate the downstream test heat exchange medium temperature by using the test pipe wall temperature. Figure 4The heat exchange sufficient coefficient curve 43 of the heat generating element c is calculated to obtain the N of the heat generating element c, which is small, so the heat exchange is more sufficient, the outlet temperature and the pipe wall temperature are more close, and the heat generating element c meets the requirements.

[0144] Then, steps S203 to S206 are executed to perform sufficient heat exchange dynamic correction. The heat exchange pipeline contains heat exchange medium, and the heat generating element exchanges heat with the heat exchange medium and air. The heat exchange process of the heat generating element is in the form of: heat source of the heat generating element -> first heat transfer structure -> internal measurement sensor of the heat generating element -> second heat transfer structure -> heat exchange medium -> third heat transfer structure -> air. In the heat generating element in the vehicle, the heat transfer structure is mostly metal, so the internal thermal conductivity coefficient is high and the thermal resistance is small. When the air flow speed is low, it can be considered that the internal temperature of the heat generating element is relatively uniform. However, when the air temperature is low and the flow rate is high and the heat exchange coefficient is high, a temperature difference between the internal measurement sensor and the heat exchange medium will be generated, so the downstream heat exchange medium temperature estimated by the pipe wall temperature also needs to be corrected.

[0145] Specifically, first, step S203 is executed, and if the heat generating element meets the replacement condition, the pipe wall temperature of the heat exchange pipeline in contact with the heat generating 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 thermal resistance according to the first heat conduction thermal resistance between the heat generating element and the pipe wall of the heat exchange pipeline and the heat exchange medium convective heat transfer thermal resistance of the heat exchange medium, and step S205 is executed to calculate the second heat transfer thermal resistance according to the second heat conduction thermal resistance of the heat transfer structure between the heat exchange medium and the air and the air convective heat transfer thermal resistance of the air.

[0147] Steps S204 and S205 can be interchanged or executed in parallel.

[0148] In one embodiment, the first heat transfer thermal resistance is calculated according to the first heat conduction thermal resistance between the heat generating element and the pipe wall of the heat exchange pipeline and the heat exchange medium convective heat transfer thermal resistance of the heat exchange medium, specifically comprising:

[0149] The first heat conduction thermal resistance between the heat generating element and the pipe wall of the heat exchange pipeline is obtained, and the heat exchange medium convective heat transfer thermal resistance of the heat exchange medium is obtained.

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

[0151] The first heat transfer thermal resistance is composed of a first heat conduction thermal resistance between the heat generating element and the wall of the heat exchange pipeline and a heat exchange medium convection heat exchange thermal resistance of the heat exchange medium. Therefore, the first heat conduction thermal resistance and the heat exchange medium convection heat exchange thermal resistance are determined respectively, and then the first heat transfer thermal resistance is determined.

[0152] The first heat conduction thermal resistance is the heat transfer thermal resistance between the heat generating element, the first heat transfer structure, the internal measurement sensor of the heat generating element, the second heat transfer structure and the wall of the pipeline contacted by the heat exchange medium. The first heat conduction thermal resistance can be obtained by fitting the heat exchange medium temperature test value of the outlet of the heat exchange pipeline and the heat exchange medium temperature prediction value obtained by experiment.

[0153] The heat exchange medium convection heat exchange thermal resistance is calculated according to the mass flow of the heat exchange medium.

[0154] In one embodiment, the heat exchange medium convection heat exchange thermal resistance of the heat exchange medium is obtained, and the method specifically comprises:

[0155] The heat exchange medium convection heat exchange thermal resistance of the heat exchange medium is calculated as follows:

[0156] R 1,conv is the heat exchange medium convection heat exchange thermal resistance, is the mass flow of the heat exchange medium, C 1w is a first heat exchange medium fitting parameter, C 2w is a second heat exchange medium fitting parameter, C 3w is a third heat exchange medium fitting parameter, A w is the heat exchange area of the heat generating element and the heat exchange medium.

[0157] Specifically, the heat exchange medium convection heat exchange thermal resistance formula (10) is established. The heat exchange medium convection heat exchange thermal resistance formula calculates the heat exchange medium convection heat exchange thermal resistance according to the mass flow of the heat exchange medium and the heat exchange medium fitting parameter. The heat exchange medium fitting parameter is obtained by fitting the heat exchange medium temperature test value of the outlet of the heat exchange pipeline and the heat exchange medium temperature prediction value obtained by experiment.

[0158]

[0159] R 1,conv is the heat exchange medium convection heat exchange thermal resistance, is the mass flow of the heat exchange medium, C 1w is a first heat exchange medium fitting parameter, C 2w is a second heat exchange medium fitting parameter, C 3w is a third heat exchange medium fitting parameter, A w is the heat exchange area of the heat generating element and the heat exchange medium.

[0160] The embodiment provides a calculation formula of a heat transfer medium convection heat transfer thermal resistance.

[0161] The first heat transfer thermal resistance is then calculated as a sum of the first heat conduction thermal resistance and the heat transfer medium convection heat transfer thermal resistance.

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

[0163] R1=R 1,cond +R 1,conv (11)

[0164] R1 is the first heat transfer thermal resistance, R 1,cond is the first heat conduction thermal resistance, and R 1,conv is the heat transfer medium convection heat transfer thermal resistance.

[0165] In one of the embodiments, the second heat transfer thermal resistance is calculated according to the second heat conduction thermal resistance of the heat transfer structure between the heat transfer medium and the air and the air convection heat transfer thermal resistance of the air, and specifically includes the following steps.

[0166] The second heat conduction thermal resistance of the heat transfer structure between the heat transfer medium and the air is obtained, and the air convection heat transfer thermal resistance is obtained.

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

[0168] The second heat transfer thermal resistance is composed of the second heat conduction thermal resistance of the heat transfer structure between the heat transfer medium and the air and the air convection heat transfer thermal resistance, so the second heat transfer thermal resistance is determined after the second heat conduction thermal resistance of the heat transfer structure between the heat transfer medium and the air and the air convection heat transfer thermal resistance are determined respectively.

[0169] The second heat conduction thermal resistance of the heat transfer structure between the heat transfer medium and the air can be obtained by fitting the heat transfer medium temperature test value at the outlet of the heat transfer pipeline and the heat transfer medium temperature prediction value obtained by experiment testing on the heat generating element.

[0170] In one of the embodiments, the air convection heat transfer thermal resistance is obtained, and specifically includes the following steps.

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

[0172] R is the air convection heat transfer thermal resistance, 2,conv is the air mass flow, is the first air fitting parameter, and C 1a is the second air fitting parameter.2a is a second air fitting parameter, C 3a is a third air fitting parameter, A a is a heat transfer area between the heat transfer medium and the air.

[0173] Specifically, the air mass flow rate can be determined by prior art, for example, for a vehicle, the vehicle speed and the fan speed have corresponding relationship with the air mass flow rate, then the relationship between the vehicle speed, the fan speed and the air mass flow rate can be determined by pre-experimental calibration, and then the corresponding air mass flow rate can be determined according to 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 an air fitting parameter, the air fitting parameter is fitted by the heat transfer medium temperature test value at the outlet of the heat transfer pipeline and the heat transfer medium temperature prediction value obtained by the experimental test.

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

[0176]

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

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

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

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

[0181] R2 = R 2,cond + R 2,conv (13)

[0182] Wherein, R2 is the second heat transfer thermal resistance, R 2,cond is the second heat conduction thermal resistance, R 2,conv is the air convection heat transfer thermal resistance.

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

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

[0185] The heat exchange medium temperature prediction value is calculated as: where T water is the heat exchange medium temperature prediction value, T test is the pipe wall temperature, T air is the air temperature, R1 is the first heat transfer thermal resistance, and R2 is the second heat transfer thermal resistance.

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

[0187] T test = T water + Q·R1 (14)

[0188] T water = Tair+ Q·R2 (15)

[0189] where T water is the heat exchange medium temperature prediction value, T test is the pipe wall temperature, T air is the air temperature, R1 is the first heat transfer thermal resistance, R2 is the second heat transfer thermal resistance, and Q is the heat dissipation of the heat generating element.

[0190] Solving the formulas (14) and (15) together gives the heat exchange medium temperature as:

[0191]

[0192] where the values of R1 and R2 are obtained by fitting the heat exchange medium temperature test value at the outlet of the heat exchange pipeline and the heat exchange medium temperature prediction value.

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

[0194] After that, the heat transfer medium temperature prediction value calculated according to formula (16) is compared with the heat transfer medium temperature test value at the outlet of the heat transfer pipeline obtained through experiments on the heat generating element, and through the least square method, the first heat conduction thermal resistance R 1,cond , second heat conduction thermal resistance R 2,cond , first heat transfer medium fitting parameter C 1w , second heat transfer medium fitting parameter C 2w , third heat transfer medium fitting parameter C 3w , first air fitting parameter C 1w , second air fitting parameter C 22 , and third air fitting parameter C 32 are fitted and obtained. The obtained first heat conduction thermal resistance R 1,cond , second heat conduction thermal resistance R 2,cond , first heat transfer medium fitting parameter C 1w , second heat transfer medium fitting parameter C 2w , third heat transfer medium fitting parameter C 3w , first air fitting parameter C 1w , second air fitting parameter C 22 , and third air fitting parameter C 32 are substituted into formula (16) to obtain a heat transfer medium temperature prediction formula for calculating the heat generating element.

[0195] Therefore, in actual use, when it is determined that the heat generating element meets the replacement condition, formula (16) can be used to estimate the heat transfer medium temperature prediction value at the outlet of the heat transfer pipeline based on the first heat transfer thermal resistance and the second heat transfer thermal resistance according to the pipe wall temperature and the air temperature.

[0196] As Figure 5The calculation effect schematic diagram of one example of the present application is shown, including a test heat exchange medium temperature curve 51, a pipe wall temperature out heat exchange medium temperature curve 52, and a heat exchange medium temperature curve 53 predicted by using the method of the present example. The abscissa is time, unit: s, and the ordinate is temperature, unit: ℃. As can be seen from the effect, the model of the present example after air flow delay can well simulate the test heat exchange medium temperature. The model without correction can only meet the heat exchange medium temperature under low flow condition, and is not accurate in simulating high air flow condition at 700-1200s, with large error.

[0197] The present example corrects the heat exchange medium temperature prediction for large air flow, improves the accuracy of the heat exchange medium temperature prediction value at large air flow through correction, reduces the sensor requirement, and thus reduces the cost. The model of the present example is simple, reliable in calculation, and high in accuracy, and can simulate the out heat exchange medium temperature under different conditions.

[0198] Based on the same inventive concept, as Figure 6 The temperature determination device of the heat exchange medium of one example of the present application is shown, including:

[0199] The acquisition module 601 is configured to acquire the pipe wall temperature of the heat exchange pipeline in contact with the heat generating element and the air temperature of the air in contact with the heat exchange pipeline;

[0200] The first heat transfer thermal resistance acquisition module 602 is configured to calculate the first heat transfer thermal resistance according to the first heat conduction thermal resistance between the heat generating element and the pipe wall of the heat exchange pipeline and the heat exchange medium convection heat transfer thermal resistance of the heat exchange medium;

[0201] The second heat transfer thermal resistance acquisition module 603 is configured to calculate the second heat transfer thermal resistance according to the second heat conduction thermal resistance of the heat transfer structure between the heat exchange medium and the air and the air convection heat transfer thermal resistance of the air;

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

[0203] The application obtains the pipe 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 thermal resistance according to the first heat conduction thermal resistance between the heating element and the pipe wall of the heat exchange pipeline and the heat exchange medium convective heat transfer thermal resistance of the heat exchange medium, calculates the second heat transfer thermal resistance according to the second heat conduction thermal resistance of the heat transfer structure between the heat exchange medium and the air and the air convective heat transfer thermal resistance of the air, and estimates the heat exchange medium temperature prediction value of the heat exchange medium based on the first heat transfer thermal resistance and the second heat transfer thermal resistance through the pipe wall temperature and the air temperature. In the estimation of the heat exchange medium temperature, the first heat conduction thermal resistance between the heating element and the pipe wall of the heat exchange pipeline, the heat exchange medium convective heat transfer thermal resistance of the heat exchange medium, the second heat conduction thermal resistance of the heat transfer structure between the heat exchange medium and the air and the air convective heat transfer thermal resistance of the air are introduced, the influence of the air on the estimation of the heat exchange medium temperature is reduced when the heat exchange medium temperature is estimated through the pipe wall temperature, and the cost is reduced by replacing the heat exchange medium temperature sensor with an algorithm, and the accuracy of the estimated heat exchange medium temperature is improved.

[0204] In one embodiment, the first heat transfer thermal resistance is calculated according to the first heat conduction thermal resistance between the heating element and the pipe wall of the heat exchange pipeline and the heat exchange medium convective heat transfer thermal resistance of the heat exchange medium, specifically comprising:

[0205] The first heat conduction thermal resistance between the heating element and the pipe wall of the heat exchange pipeline is obtained, and the heat exchange medium convective heat transfer thermal resistance of the heat exchange medium is obtained.

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

[0207] In one embodiment, the heat exchange medium convective heat transfer thermal resistance of the heat exchange medium is obtained, specifically comprising:

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

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

[0210] In one of the embodiments, the second heat transfer thermal resistance is calculated according to the second thermal conduction thermal resistance of the heat transfer structure between the heat transfer medium and the air and the air convection heat transfer thermal resistance of the air, specifically comprising:

[0211] The second thermal conduction thermal resistance of the heat transfer structure between the heat transfer medium and the air is obtained, and the air convection heat transfer thermal resistance is obtained.

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

[0213] In one of the embodiments, the air convection heat transfer thermal resistance is obtained, specifically comprising:

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

[0215] Wherein, R 2,conv is the air convection heat transfer thermal resistance, is the air mass flow, 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 is the heat transfer area of the heat transfer structure between the heat transfer medium and the air.

[0216] In one of the embodiments, the heat transfer medium temperature prediction value at the outlet of the heat transfer pipeline is estimated based on the first heat transfer thermal resistance and the second heat transfer thermal resistance according to the pipe wall temperature and the air temperature, specifically comprising:

[0217] The heat transfer medium temperature prediction value of the heat transfer medium is calculated as: Wherein, T water is the heat transfer medium temperature prediction value, T test is the pipe wall temperature, T air is the air temperature, R1 is the first heat transfer thermal resistance, and R2 is the second heat transfer thermal resistance. The first heat transfer thermal resistance and the second heat transfer thermal resistance are obtained by fitting the heat transfer medium temperature test value at the outlet of the heat transfer pipeline and the heat transfer medium temperature prediction value obtained by experiment test.

[0218] In one of the embodiments, the pipe wall temperature of the heat transfer pipeline in contact with the heat generating element and the air temperature of the air in contact with the heat transfer pipeline are obtained, specifically comprising:

[0219] The heat transfer sufficient coefficient is calculated according to the heat transfer medium heat transfer coefficient of the heat transfer medium and the heat transfer medium mass flow.

[0220] According to the heat exchange sufficiency coefficient, it is judged whether the heat generating element meets the replacement condition or not.

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

[0222] In one of the embodiments, the heat exchange sufficiency coefficient is: Wherein, N is the heat exchange sufficiency coefficient, e is the natural constant, a w is the heat exchange coefficient of the heat exchange medium, A w is the heat exchange area of the heat generating element and the heat exchange medium, is the mass flow of the heat exchange medium, and Cp is the specific heat at constant pressure of the heat exchange medium.

[0223] In one of the embodiments, the replacement condition is:

[0224] If the heat generating element meets |ΔT·N|<|T Tolerence | under any flow, it is judged that the heat generating element meets the replacement condition, otherwise it is judged that the heat generating element does not meet the replacement condition, wherein, △T is the common difference of the heat exchange medium temperature and the pipe wall temperature of the heat generating element, T Tolerence is the prediction error accuracy, and N is the heat exchange sufficiency coefficient.

[0225] As to the device in the above-mentioned embodiments, the specific manner in which each module performs the operation has been described in detail in the embodiments related to the method, and will not be described in detail here.

[0226] As Figure 7 shown is a hardware structure schematic diagram of an electronic device, which comprises:

[0227] at least one processor 701; and

[0228] a memory 702 in communication connection with the at least one processor 701; wherein

[0229] The memory 702 stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to execute the temperature determination method of the heat exchange medium as described above.

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

[0231] The electronic device can further comprise an input device 703 and a display device 704.

[0232] The processor 701, memory 702, input device 703 and display device 704 can be connected by a bus or other means. The figure shows an example of connection by a bus.

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

[0234] The memory 702 may include a program storage area and a data storage area. The program storage area may store an operating system and an application program required for at least one function. The data storage area may store data created based on the use of the method for determining the temperature of the heat exchange medium. Furthermore, the memory 702 may include high-speed random access memory and may also include non-volatile memory, such as at least one disk storage device, flash memory device, or other non-volatile solid-state storage device. In some embodiments, the memory 702 may optionally include memory remotely located relative to the processor 701, and these remote memories may be connected via a network to the apparatus performing the method for determining the temperature of the heat exchange medium. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, 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 may include a display screen or other display equipment.

[0236] When one or more modules are stored in the memory 702, and are run by 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 application obtains the pipe 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 thermal resistance according to the first heat conduction thermal resistance between the heating element and the pipe wall of the heat exchange pipeline and the heat exchange medium convection heat transfer thermal resistance of the heat exchange medium, calculates the second heat transfer thermal resistance according to the second heat conduction thermal resistance of the heat transfer structure between the heat exchange medium and the air and the air convection heat transfer thermal resistance of the air, and estimates the heat exchange medium temperature prediction value of the heat exchange medium based on the first heat transfer thermal resistance and the second heat transfer thermal resistance through the pipe wall temperature and the air temperature. When estimating the heat exchange medium temperature, the application introduces the first heat conduction thermal resistance between the heating element and the pipe wall of the heat exchange pipeline, the heat exchange medium convection heat transfer thermal resistance of the heat exchange medium, the second heat conduction thermal resistance of the heat transfer structure between the heat exchange medium and the air, and the air convection heat transfer thermal resistance of the air, reduces the influence of the air on the heat exchange medium temperature estimation when estimating the heat exchange medium temperature through the pipe wall temperature, and replaces the heat exchange medium temperature sensor through the algorithm, reduces the cost, and improves the accuracy of the estimated heat exchange medium temperature.

[0238] An embodiment of the application provides a storage medium, which stores computer instructions, when a computer executes the computer instructions, all steps of the heat exchange medium temperature determination method are executed.

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

[0240] An embodiment of the application provides a vehicle, which comprises the heat exchange medium temperature determination apparatus or the electronic device. It can be understood that the vehicle can also comprise 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 heat exchange medium temperature determination method provided by the embodiments of the present disclosure. The processor and the memory have been described in the foregoing embodiments, and details are not described herein. Figure 7 Some parts described in the embodiments are not described herein.

[0241] The above embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the patent scope of the present application. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, several modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A method of determining the temperature of a heat exchange medium, characterized by, The method comprises the following steps: calculating a heat exchange sufficiency coefficient according to a heat exchange medium heat exchange coefficient and a heat exchange medium mass flow of the heat exchange medium; judging whether the heat generating element meets a replacement condition according to the heat exchange sufficiency coefficient; if the heat generating element meets the replacement condition, obtaining a pipe wall temperature of a heat exchange pipeline in contact with the heat generating element and an air temperature of air in contact with the heat exchange pipeline; calculating a first heat transfer thermal resistance according to a first heat conduction thermal resistance between the heat generating element and the pipe wall of the heat exchange pipeline and a heat exchange medium convection heat exchange thermal resistance of the heat exchange medium; calculating a second heat transfer thermal resistance according to a second heat conduction thermal resistance of a heat transfer structure between the heat exchange medium and the air and an air convection heat exchange thermal resistance of the air; estimating a heat exchange medium temperature prediction value at an outlet of the heat exchange pipeline based on the first heat transfer thermal resistance and the second heat transfer thermal resistance according to the pipe wall temperature and the air temperature.

2. The heat medium temperature determining method according to claim 1, characterized by, The method of calculating the first heat transfer thermal resistance according to the first heat conduction thermal resistance between the heat generating element and the pipe wall of the heat exchange pipeline and the heat exchange medium convection heat exchange thermal resistance of the heat exchange medium comprises the following steps: obtaining the first heat conduction thermal resistance between the heat generating element and the pipe wall of the heat exchange pipeline and the heat exchange medium convection heat exchange thermal resistance of the heat exchange medium; calculating the first heat transfer thermal resistance between the heat generating element and the heat exchange medium as a sum of the first heat conduction thermal resistance and the heat exchange medium convection heat exchange thermal resistance.

3. The heat medium temperature determining method according to claim 2, characterized by, The method of obtaining the heat exchange medium convection heat exchange thermal resistance of the heat exchange medium comprises the following steps: calculating the heat exchange medium convection heat exchange thermal resistance of the heat exchange medium as: wherein R 1,conv is the heat transfer resistance of the heat transfer medium by convection, is the mass flow of the heat transfer medium, C 1w is a first fitting parameter for the heat transfer medium, C 2w is a second fitting parameter for the heat transfer medium, C 3w is a third fitting parameter for the heat transfer medium, A w is the heat transfer area of the heat generating element to the heat transfer medium.

4. The heat medium temperature determining method according to claim 1, characterized by, The method of calculating the second heat transfer thermal resistance according to the second heat conduction thermal resistance of the heat transfer structure between the heat exchange medium and the air and the air convection heat exchange thermal resistance of the air comprises the following steps: obtaining the second heat conduction thermal resistance of the heat transfer structure between the heat exchange medium and the air and the air convection heat exchange thermal resistance; calculating the second heat transfer thermal resistance between the heat exchange medium and the air as a sum of the second heat conduction thermal resistance and the air convection heat exchange thermal resistance.

5. The heat medium temperature determining method according to claim 4, characterized by, The method of obtaining the air convection heat exchange thermal resistance comprises the following steps: calculating the air convection heat exchange thermal resistance as: where R 2,conv is the air convection heat transfer thermal resistance, is the air mass flow rate, C 1a is a first air fitting parameter, C 2a is a second air fitting parameter, C 3a is a third air fitting parameter, A a is the heat transfer area of the heat transfer structure between the heat transfer medium and the air.

6. The heat medium temperature determining method according to claim 1, characterized by, The method of estimating the heat exchange medium temperature prediction value at the outlet of the heat exchange pipeline based on the first heat transfer thermal resistance and the second heat transfer thermal resistance according to the pipe wall temperature and the air temperature comprises the following steps: calculating a heat medium temperature prediction value of the heat medium as: where T water is the heat medium temperature prediction value, T test is the tube wall temperature, T air is the air temperature, R1 is the first heat transfer thermal resistance, and R2 is the second heat transfer thermal resistance.

7. The heat medium temperature determining method according to claim 1, characterized by, The heat exchange sufficiency coefficient is: Wherein, N is the heat exchange sufficiency coefficient, e is a natural constant, a w is a heat exchange medium heat exchange coefficient, A w is the heat exchange area of the heating element and the heat exchange medium, is the mass flow of the heat exchange medium, Cp is the specific heat at constant pressure of the heat exchange medium.

8. The heat medium temperature determining method according to claim 1, characterized by, the replacement condition is that: If the heating element satisfies |△T·N|<|T Tolerence | under any flow rate, it is determined that the heating element satisfies the alternative condition, otherwise it is determined that the heating element does not satisfy the alternative condition, wherein △T is the common difference between the heat transfer 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.

9. A heat medium temperature determining device characterized by comprising: The method comprises the following steps: an obtaining module is configured to obtain a pipe wall temperature of a heat exchange pipeline in contact with a heat generating element and an air temperature of air in contact with the heat exchange pipeline; a first heat transfer thermal resistance obtaining module is configured to calculate a first heat transfer thermal resistance according to a first heat conduction thermal resistance between the heat generating element and the pipe wall of the heat exchange pipeline and a heat exchange medium convection heat exchange thermal resistance of the heat exchange medium; a second heat transfer thermal resistance obtaining module is configured to calculate a second heat transfer thermal resistance according to a second heat conduction thermal resistance of a heat transfer structure between the heat exchange medium and the air and an air convection heat exchange thermal resistance of the air; a heat exchange medium temperature prediction module is configured to estimate a heat exchange medium temperature prediction value at an outlet of the heat exchange pipeline based on the first heat transfer thermal resistance and the second heat transfer thermal resistance according to the pipe wall temperature and the air temperature. The method comprises the following steps: According to the heat exchange medium heat exchange coefficient and the heat exchange medium mass flow rate, a heat exchange sufficiency coefficient is calculated; According to the heat exchange sufficiency coefficient, it is determined whether the heat generating element meets the replacement condition; If the heat generating element meets the replacement condition, the pipe wall temperature of the heat exchange pipeline in contact with the heat generating element and the air temperature of the air in contact with the heat exchange pipeline are obtained.

10. An electronic device, comprising: Comprise: At least one processor; And, The memory is in communication connection with the at least one processor; wherein The memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to execute the heat exchange medium temperature determination method according to any one of claims 1 to 8.

11. A storage medium, characterized by The storage medium stores computer instructions, and when the computer executes the computer instructions, all steps of the heat exchange medium temperature determination method according to any one of claims 1 to 8 are executed.

12. A vehicle characterized by comprising: The heat exchange medium temperature determination device according to claim 9 or the electronic equipment according to claim 10.

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