A vehicle electric heating system parameter calibration device and method

Abstract

The application discloses a kind of vehicle electric heating system parameter calibration device and method.The device includes environment cabin, enthalpy difference wind tunnel, electric heater, warm air pipeline, air conditioner module, power supply and control module;Power supply is connected with electric heater, cooling liquid is arranged in warm air pipeline, and electric heater is used to heat cooling liquid;First measurement module is arranged in enthalpy difference wind tunnel, and air conditioner module is used to blow the heat of heated cooling liquid into enthalpy difference wind tunnel;First measurement module is used to measure air outlet flow and air outlet temperature of air conditioner module;Control module is used to determine air side heat absorption according to air outlet flow and air outlet temperature, and determine the power consumption of electric heater corresponding to each group of control variables and liquid side heat release, determine target cooling liquid flow and target air conditioner air volume according to power consumption, liquid side heat release and air side heat absorption.The application can select target cooling liquid flow and target air conditioner air volume under the required ambient temperature, and realize the calibration of parameter.

Description

Technical Field

[0001] This invention relates to the field of vehicle electric heating technology, and in particular to a vehicle electric heating system parameter calibration device and method. Background Technology

[0002] With the rapid development of new energy technologies, electric vehicles are being used more and more widely.

[0003] Electric vehicles use the electrical energy from their power batteries to convert into heat energy to meet the heating and defrosting needs of the cab. Specifically, the power battery powers a power source that powers a PTC (Power Transmission Control Unit) heater, which heats the coolant. This heat is then blown into the cab by the air conditioning module. In low-temperature environments, the amount of electricity consumed by the electric vehicle's power battery for heating to ensure passenger comfort and for defrosting and defogging to ensure visibility will inevitably have a direct and significant impact on the electric vehicle's driving range.

[0004] Existing electric vehicles may shut down the electric heater directly when the battery charge is low, causing the heating and defrosting functions to be turned off, resulting in a poor user experience. Summary of the Invention

[0005] This invention provides a device and method for calibrating parameters of a vehicle electric heating system, in order to solve the problems that the electric heater affects the range of the power battery when heating, and that the user experience is poor when the electric heater is turned off when the power battery is low.

[0006] According to one aspect of the present invention, a vehicle electric heating system parameter calibration device is provided, the vehicle electric heating system parameter calibration device comprising: an environmental chamber, an enthalpy difference wind tunnel, an electric heater, a heating air duct, an air conditioning module, a power supply, and a control module; wherein the enthalpy difference wind tunnel, the electric heater, the heating air duct, the air conditioning module, and the control module are located within the environmental chamber;

[0007] The power source is connected to the electric heater, and the power source is used to supply power to the electric heater;

[0008] The heating duct is connected between the electric heater and the air conditioning module, and coolant is provided in the heating duct; the electric heater is used to heat the coolant.

[0009] The enthalpy difference wind tunnel is equipped with a first measurement module, which is located at the air outlet of the air conditioning module. The air conditioning module is used to blow the heat of the heated coolant into the enthalpy difference wind tunnel. The first measurement module is used to measure the air flow rate and air temperature of the air conditioning module.

[0010] The control module is connected to the first measurement module. The control module is used to determine the heat absorbed by the air side based on the air flow rate and the air temperature, and to determine the power consumption of the electric heater and the heat released by the liquid side corresponding to each set of control variables. The control module is also used to determine the target coolant flow rate and the target air conditioning output volume based on the power consumption, the heat released by the liquid side, and the heat absorbed by the air side. The control variables include the coolant flow rate, the air output volume of the air conditioning module, and the ambient temperature of the environmental chamber.

[0011] Optionally, the device further includes a circulating water pump, a second measuring module, and a third measuring module;

[0012] The circulating water pump is installed on the heating pipe and is connected between the electric heater and the air conditioning module. The circulating water pump is used to transfer the coolant heated by the electric heater to the air conditioning module.

[0013] The control module is connected to the control terminal of the circulating water pump. The control module is used to control the speed change of the circulating water pump in order to control the flow rate change of the coolant.

[0014] The second measuring module is installed on the heating air duct, and the second measuring module is used to measure the actual flow rate of coolant in the heating air duct;

[0015] The third measuring module is connected to the control module. The third measuring module is used to detect the outlet water temperature and the inlet water temperature of the electric heater, and send the outlet water temperature and the inlet water temperature to the control module.

[0016] The control module is connected to the second measurement module. The control module is used to obtain the actual flow rate of the coolant and calculate the heat released on the liquid side based on the actual flow rate of the coolant, the outlet water temperature and the inlet water temperature.

[0017] Optionally, the enthalpy difference wind tunnel is also equipped with a flow stabilizer and a compensating fan;

[0018] The flow stabilizer is disposed at the outlet of the air conditioning module, and the flow stabilizer is used to stabilize the air blown out by the air conditioning module;

[0019] The compensating fan is connected to the control module, which controls the operation of the compensating fan according to the atmospheric pressure and the actual air pressure of the enthalpy difference wind tunnel, following a closed-loop control strategy.

[0020] Optionally, the device further includes an air guide transition section and an expansion tank;

[0021] The air guide transition section is located between the outlet of the air conditioning module and the enthalpy difference wind tunnel;

[0022] The expansion tank is connected to the heating air duct, and the expansion tank is used to supply the coolant to the heating air duct.

[0023] Optionally, the device further includes a fourth measurement module;

[0024] The fourth measuring module is installed in the environmental chamber. The distance between the fourth measuring module and the wall of the environmental chamber is greater than or equal to a preset value. The distance between the fourth measuring module and the air conditioning module is greater than or equal to a preset value. The fourth measuring module is used to measure the actual ambient temperature of the environmental chamber.

[0025] The fourth measurement module is connected to the control module, and the control module is used to calculate the heat absorbed by the air side based on the actual ambient temperature, the air outlet temperature of the air conditioning module, and the air outlet flow rate.

[0026] Optionally, the first measurement module includes an air flow sensor and an air temperature sensor;

[0027] The air flow sensor is connected to the control module. The air flow sensor is used to detect the air flow rate of the air conditioning module and send the air flow rate to the control module.

[0028] The air temperature sensor is connected to the control module. The air temperature sensor is used to detect the air outlet temperature of the air conditioning module and send the air outlet temperature to the control module.

[0029] Optionally, the first measurement module further includes an air pressure sensor;

[0030] The air pressure sensor is located between the flow stabilizer and the outlet of the air conditioning module. The air pressure sensor is connected to the control module and is used to detect the actual air pressure of the enthalpy difference wind tunnel.

[0031] According to another aspect of the present invention, a method for calibrating parameters of a vehicle electric heating system is provided. The method is implemented by a vehicle electric heating system parameter calibration device according to any embodiment of the present invention. The device includes: an environmental chamber, an enthalpy difference wind tunnel, an electric heater, a heating air duct, an air conditioning module, a power supply, and a control module. The enthalpy difference wind tunnel, the electric heater, the heating air duct, the air conditioning module, and the control module are located within the environmental chamber. The power supply is connected to the electric heater, and the heating air duct is connected between the electric heater and the air conditioning module, with coolant disposed in the heating air duct. A first measurement module is disposed in the enthalpy difference wind tunnel, which is located at the air outlet of the air conditioning module. The control module is connected to the first measurement module. The method is executed by the control module. The method includes:

[0032] After the electric heater heats the coolant and the air conditioning module blows the heat from the heated coolant into the enthalpy difference wind tunnel, the heat absorbed on the air side is determined based on the airflow rate and air temperature of the air conditioning module measured by the first measuring module.

[0033] The power consumption and heat release on the liquid side of the electric heater corresponding to each set of control variables are determined, and the target coolant flow rate and target air conditioning output volume are determined based on the power consumption, the heat release on the liquid side and the heat absorption on the air side; wherein, the control variables include the coolant flow rate, the air conditioning module output volume and the ambient temperature of the environmental chamber.

[0034] Optionally, the enthalpy difference wind tunnel is further equipped with a compensating fan, which is connected to the control module; the method further includes:

[0035] The operation of the compensation fan is controlled according to the atmospheric pressure and the actual air pressure of the enthalpy difference wind tunnel, following a closed-loop control strategy.

[0036] Optionally, the environmental chamber is further equipped with a turbulence fan, which is connected to the control module; the method further includes:

[0037] The operation of the turbulence fan is controlled according to the preset ambient temperature and the actual ambient temperature of the environmental chamber, following a closed-loop control strategy.

[0038] The technical solution of this invention replicates the vehicle's environment by setting up an environmental chamber, a power supply to replicate the vehicle's battery, and an enthalpy difference wind tunnel to replicate the environment of the vehicle's cabin. By setting control variables and detecting the power consumption, liquid-side heat release, and air-side heat absorption corresponding to each set of control variables, multiple sets of relationships between power consumption, liquid-side heat release, and air-side heat absorption and the control variables are obtained. This allows for the selection of target coolant flow rate and target air conditioning output at the desired ambient temperature, thus calibrating the coolant flow rate and air conditioning output. By controlling the coolant flow rate according to the determined target coolant flow rate and the air conditioning output according to the determined target air conditioning output, the comfort requirements of the cabin are met while minimizing the power consumption of the electric heater, avoiding the impact of heating and defrosting on the vehicle's battery range, and improving the user experience.

[0039] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 This is a schematic diagram of the structure of a vehicle electric heating system parameter calibration device provided in an embodiment of the present invention;

[0042] Figure 2 yes Figure 1 A magnified view of a portion of the image;

[0043] Figure 3 This is a schematic diagram of the structure of another vehicle electric heating system parameter calibration device provided in an embodiment of the present invention;

[0044] Figure 4 This is a schematic diagram of the structure of another vehicle electric heating system parameter calibration device provided in an embodiment of the present invention;

[0045] Figure 5 This is a schematic diagram of the structure of another vehicle electric heating system parameter calibration device provided in an embodiment of the present invention;

[0046] Figure 6 This is a flowchart of a method for calibrating parameters of a vehicle electric heating system provided in an embodiment of the present invention;

[0047] Figure 7 This is a flowchart of another method for calibrating parameters of a vehicle electric heating system provided in an embodiment of the present invention. Detailed Implementation

[0048] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0049] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0050] This embodiment provides a parameter calibration device for a vehicle electric heating system. The vehicle is, for example, an electric vehicle. The electric heating system includes an electric heater and an air conditioning module. The electric heater is a PTC heater. Figure 1 This is a schematic diagram of the structure of a vehicle electric heating system parameter calibration device provided in an embodiment of the present invention. Figure 2 yes Figure 1 A magnified view of a portion of the image. Figure 3 This is a schematic diagram of another vehicle electric heating system parameter calibration device provided in an embodiment of the present invention. Figure 3 It shows Figure 1 and Figure 2 The interconnections between the various components. (Reference) Figure 1 , Figure 2 and Figure 3 The vehicle electric heating system parameter calibration device includes: an environmental chamber 100, an enthalpy difference wind tunnel 110, an electric heater 120, a heating air duct 130, an air conditioning module 140, a power supply 150, and a control module 160; the enthalpy difference wind tunnel 110, the electric heater 120, the heating air duct 130, the air conditioning module 140, and the control module 160 are located inside the environmental chamber 100;

[0051] The power supply 150 is connected to the electric heater 120, and the power supply 150 is used to supply power to the electric heater 120.

[0052] The heating duct 130 is connected between the electric heater 120 and the air conditioning module 140, and coolant is installed in the heating duct 130; the electric heater 120 is used to heat the coolant.

[0053] The enthalpy difference wind tunnel 110 is equipped with a first measurement module 111. The enthalpy difference wind tunnel 110 is located at the air outlet of the air conditioning module 140. The air conditioning module 140 is used to blow the heat of the heated coolant into the enthalpy difference wind tunnel 110. The first measurement module 111 is used to measure the air flow rate and air temperature of the air conditioning module 140.

[0054] The control module 160 is connected to the first measurement module 111. The control module 160 is used to determine the heat absorbed by the air side based on the air flow rate and air temperature, and to determine the power consumption of the electric heater 120 and the heat released by the liquid side corresponding to each set of control variables. It also determines the target coolant flow rate and the target air conditioning output volume based on the power consumption, the heat released by the liquid side and the heat absorbed by the air side. The control variables include the coolant flow rate, the air output volume of the air conditioning module 140 and the ambient temperature of the environmental chamber 100.

[0055] The environmental chamber 100 can replicate the environment in which the vehicle is located. The enthalpy difference wind tunnel 110 can replicate the environment in the driver's cabin of the vehicle. The power supply 150 can replicate the vehicle's power battery. The power supply 150 supplies power to the electric heater 120, enabling the electric heater 120 to heat the coolant. The power supply 150 can be located inside or outside the environmental chamber 100. Figure 1 The image shows the power supply 150 outside the environmental chamber 100. Figure 3 The diagram shows the power supply 150 within the environmental chamber 100, but is not limiting. The coolant can be an aqueous ethylene glycol solution. The heating duct 130 carries the coolant, transferring the heated coolant from the electric heater 120 to the air conditioning module 140. The air conditioning module 140 blows the heat from the heated coolant into the enthalpy difference wind tunnel 110. After heat exchange in the enthalpy difference wind tunnel 110, the coolant flows back from the heating duct 130 to the electric heater 120, which continues to heat the coolant. This cycle achieves heating of the enthalpy difference wind tunnel 110, thus heating of the cockpit. The air conditioning module 140 is the air conditioning housing assembly, which may include a heater core and an air conditioning fan. The heating duct 130 transfers the heated coolant to the heater core, and the air conditioning fan blows the heat into the enthalpy difference wind tunnel 110. The control module 160 can be a host computer or other control devices.

[0056] Specifically, during calibration, the operating mode of the air conditioning module 140 is first selected (e.g., defrost mode or foot blowing mode), and the values ​​of the control variables are set. The power supply 150 is then turned on, supplying power to the electric heater 120. The electric heater 120 heats the coolant, and the warm air duct 130 transfers the heated coolant from the electric heater 120 to the air conditioning module 140. The air conditioning module 140 blows the heat from the heated coolant into the enthalpy difference wind tunnel 110. The first measurement module 111 in the enthalpy difference wind tunnel 110 measures the airflow rate and air temperature of the air conditioning module 140. The control module 160 can calculate the heat absorbed on the air side and the heat released on the liquid side based on the airflow rate and air temperature, and can also obtain the power consumption of the electric heater 120. By changing at least one of the control variables—namely, changing at least one of the coolant flow rate, the airflow rate of the air conditioning module 140, and the ambient temperature of the environmental chamber 100—the power consumption, the heat released on the liquid side, and the heat absorbed on the air side corresponding to the control variables are determined again. By repeating this process, multiple sets of power consumption, liquid-side heat release, and air-side heat absorption under different control variables can be obtained, thus establishing the correspondence between multiple sets of control variables and power consumption, liquid-side heat release, and air-side heat absorption. For example, the ambient temperature can be set to -20℃, the coolant flow rate to a1, and the airflow rate of the air conditioning module 140 to b1, yielding one set of power consumption, liquid-side heat release, and air-side heat absorption. Then, keeping the ambient temperature at -20℃ and the coolant flow rate at a1, the airflow rate of the air conditioning module 140 is updated to b2, again yielding one set of power consumption, liquid-side heat release, and air-side heat absorption. Similarly, by keeping the ambient temperature and the airflow rate of the air conditioning module 140 constant while changing the coolant flow rate, multiple sets of control variables and their corresponding power consumption, liquid-side heat release, and air-side heat absorption can be obtained. Then, by changing the ambient temperature and repeating the above process, we can obtain multiple sets of relationships between control variables and power consumption, heat released on the liquid side, and heat absorbed on the air side.

[0057] By obtaining the correspondence between multiple sets of control variables and power consumption, liquid-side heat release, and air-side heat absorption, the target coolant flow rate and target air conditioning output volume can be selected for each possible ambient temperature based on the target requirements. For example, from multiple sets of power consumption, liquid-side heat release, and air-side heat absorption corresponding to -30℃, the coolant flow rate corresponding to the lower power consumption and higher liquid-side heat release and air-side heat absorption can be selected as the target coolant flow rate at an ambient temperature of -30℃, and the air conditioning output volume corresponding to the lower power consumption and higher liquid-side heat release and air-side heat absorption can be selected as the target air conditioning output volume. Similarly, from multiple sets of power consumption, liquid-side heat release, and air-side heat absorption corresponding to -20℃, the coolant flow rate corresponding to the lower power consumption and higher liquid-side heat release and air-side heat absorption can be selected as the target coolant flow rate at an ambient temperature of -20℃, and the air conditioning output volume corresponding to the lower power consumption and higher liquid-side heat release and air-side heat absorption can be selected as the target air conditioning output volume.

[0058] This allows for the calibration of coolant flow rate and air conditioning output volume. Target requirements include, for example, that the heat release on the liquid side is within a preset heat range and the power consumption is within a preset power range; or that the ratio of heat absorption on the air side to heat release on the liquid side (heat absorption efficiency) is within a preset ratio range and the power consumption is within a preset power range; or that the outlet water temperature of the electric heater 120 is within a preset temperature range and the power consumption is within a preset power range; or that the difference between the actual temperature and the set temperature of the enthalpy difference wind tunnel 110 is within a preset threshold range and the power consumption is within a preset power range; or that the heat release efficiency of the electric heater 120 is within a first preset efficiency range and the power consumption is within a preset power range. Target requirements can also be combinations of the above conditions. Thus, by controlling the coolant flow rate according to a determined target coolant flow rate and controlling the air conditioning output volume according to a determined target air conditioning output volume, the comfort requirements of the driver's cabin can be met while minimizing the power consumption of the electric heater 120, avoiding the impact of heating and defrosting on the vehicle's battery range, and improving the user experience.

[0059] The preset heat range and preset temperature range can be determined based on the ambient temperature and the target temperature. That is, the amount of heat to be released can be determined based on the ambient temperature and the target temperature, thereby determining the preset heat range and preset temperature range. The preset power range can be determined based on the power battery's charge level. When the power battery's charge level is high, the preset power range can be wider, and when the power battery's charge level is low, the preset power range can be narrower. This embodiment does not impose any limitations on this.

[0060] It should be noted that in some implementations, the position of the air conditioning module 140 differs between defrost mode and foot-blowing mode. Figure 1 and Figure 2The image shows the location of the air conditioning module 140 in defrost mode, but does not specify it.

[0061] The technical solution of this embodiment replicates the vehicle's environment by setting up an environmental chamber, a power supply to replicate the vehicle's battery, and an enthalpy difference wind tunnel to replicate the environment of the vehicle's cabin. By setting control variables and detecting the power consumption, liquid-side heat release, and air-side heat absorption corresponding to each set of control variables, multiple sets of relationships between power consumption, liquid-side heat release, and air-side heat absorption and the control variables are obtained. This allows for the selection of target coolant flow rate and target air conditioning output at the desired ambient temperature, thus calibrating the coolant flow rate and air conditioning output. By controlling the coolant flow rate according to the determined target coolant flow rate and the air conditioning output according to the determined target air conditioning output, the comfort requirements of the cabin are met while minimizing the power consumption of the electric heater, avoiding the impact of heating and defrosting on the vehicle's battery range, and improving the user experience.

[0062] Based on the above technical solutions, Figure 4 This is a schematic diagram of another vehicle electric heating system parameter calibration device provided in an embodiment of the present invention. Figure 5 This is a schematic diagram of another vehicle electric heating system parameter calibration device provided in an embodiment of the present invention. Figure 5 It shows Figure 4 The connection relationships of the corresponding devices can optionally be referenced. Figure 4 and Figure 5 The vehicle electric heating system parameter calibration device also includes a circulating water pump 210, a second measurement module 220 and a third measurement module 230;

[0063] The circulating water pump 210 is installed on the heating air duct 130. The circulating water pump 210 is connected between the electric heater 120 and the air conditioning module 140. The circulating water pump 210 is used to transfer the coolant heated by the electric heater 120 to the air conditioning module 140.

[0064] The control module 160 is connected to the control terminal of the circulating water pump 210. The control module 160 is used to control the speed change of the circulating water pump 210 in order to control the flow rate change of the coolant.

[0065] The second measurement module 220 is installed on the heating air duct 130 and is used to measure the actual flow rate of coolant in the heating air duct 130.

[0066] The third measurement module 230 is connected to the control module 160. The third measurement module 230 is used to detect the outlet water temperature and inlet water temperature of the electric heater 120 and send the outlet water temperature and inlet water temperature to the control module 160.

[0067] The control module 160 is connected to the second measurement module 220. The control module 160 is used to obtain the actual flow rate of the coolant and calculate the heat release on the liquid side based on the actual flow rate of the coolant, the outlet water temperature and the inlet water temperature.

[0068] Specifically, by setting up a circulating water pump 210, the coolant heated by the electric heater 120 can be drawn and transferred to the air conditioning module 140. The second measurement module 220 includes, for example, a turbine flow meter, which can detect the flow rate of the coolant and obtain the actual flow rate of the coolant.

[0069] Optionally, the third measurement module 230 may include an outlet water temperature sensor 231 and an inlet water temperature sensor 232. The inlet water temperature sensor 232 is located at the inlet of the electric heater 120, and the outlet water temperature sensor 231 is located at the outlet of the electric heater 120. Thus, the third measurement module 230 can measure the inlet water temperature and the outlet water temperature of the electric heater 120.

[0070] For example, the inlet water temperature is T in The outlet water temperature is T out The specific heat capacity of the coolant is C. pw The density of the coolant is ρ w The actual flow rate of the coolant is q w The heat released on the liquid side is Q. w The heat released on the liquid side is Q. w =C pw ·ρ w ·q w ·(T out -T in Therefore, the heat release on the liquid side can be calculated based on the actual flow rate, outlet temperature, and inlet temperature of the coolant. The heat release on the liquid side makes it easy to determine whether the flow rate of the coolant during this heating process meets the heat release requirements.

[0071] For example, Table 1 is a control variable setting table. As shown in Table 1, the temperature of the environmental chamber 100 is set to the required temperature (the ambient temperature where the power battery is located), for example, the temperature of the environmental chamber 100 is set to -30℃, -25℃, and -20℃, etc. At each environmental chamber temperature, the rotational speed of the circulating water pump 210 is set to N1, and the corresponding coolant flow rate is q. w1 The rotational speed of the circulating water pump 210 is set to N2, and the corresponding coolant flow rate is q. w2 The rotational speed of the circulating water pump 210 is set to N3, and the corresponding coolant flow rate is q. w3 The airflow rate of the air conditioning module 140 in defrost mode is set to V. d1 V d2 and V d3The airflow rate of the air conditioning module 140 in foot blowing mode is set to V. f1 V f2 and V f3 The airflow rate of the air conditioning module 140 in defrost and foot-blowing modes is set to V respectively. df1 V df2 and V df3 Thus, by setting multiple sets of control variables, the power consumption, heat release on the liquid side, and heat absorption on the air side can be obtained under multiple sets of control variables. The target coolant flow rate and target air conditioning output volume can be selected at the desired ambient temperature, achieving calibration of the coolant flow rate and air conditioning output volume. It should be noted that the ambient temperature can also be selected as -15℃, -10℃, etc., and each ambient temperature can correspond to more sets of control variables. Table 1 only illustrates the case of nine sets of control variables for each ambient temperature, but does not impose any limitations.

[0072] Table 1 Control Variable Settings Table

[0073]

[0074]

[0075] Optionally, the control module 160 obtains the power output from the power supply 150, which is the power consumed by the electric heater 120. The control module 160 calculates the heat release efficiency based on the heat released from the liquid side and the power consumed by the electric heater 120. For example, the power consumed by the electric heater 120 is P. out The heat release efficiency of electric heater 120 is η w ,but In this way, it can be determined whether the heat release efficiency corresponding to the current control variable meets the requirements, and it is convenient to determine whether the current coolant flow rate and the air outlet flow rate of the air conditioning module can be used as the target coolant flow rate and the target air conditioning air volume.

[0076] Optionally, the control module 160 determines the power consumption P of the electric heater 120. out Given the working time h, the power consumption W of the electric heater 120 can be calculated, W = P out ·h, thus, it can be determined whether the power consumption corresponding to the current control variable meets the requirements, and it is convenient to determine whether the current coolant flow rate and the air outlet flow rate of the air conditioning module can be used as the target coolant flow rate and the target air conditioning air outlet volume.

[0077] Thus, by calculating the heat release, heat release efficiency, and power consumption on the liquid side for each heating cycle (corresponding to each control variable), it is easy to find the target coolant flow rate and target air conditioning output volume corresponding to higher heat release efficiency and lower power consumption.

[0078] Optionally, refer to Figure 5The enthalpy difference wind tunnel 110 is also equipped with a flow stabilizer 112 and a compensating fan 113. The flow stabilizer 112 is located at the outlet of the air conditioning module 140 and is used to stabilize the air blown out by the air conditioning module 140. The compensating fan 113 is connected to the control module 160, which is used to control the operation of the compensating fan 113 according to the atmospheric pressure and the actual air pressure of the enthalpy difference wind tunnel 110, following a closed-loop control strategy.

[0079] Specifically, the flow stabilizer 112 is a throttling orifice plate. The flow stabilizer 112 can stabilize the airflow from the air conditioning module 140, making the airflow towards the enthalpy difference wind tunnel 110 more uniform. This helps to ensure uniform temperature within the enthalpy difference wind tunnel 110, thus improving the accuracy of outlet air temperature detection. By setting up a compensation fan 113, the air pressure in the enthalpy difference wind tunnel 110 can be compensated. A closed-loop control strategy, for example, is implemented through a proportional-integral-derivative (PID) controller. The control module 160 inputs the atmospheric pressure and the actual air pressure of the enthalpy difference wind tunnel 110 to the PID controller. The PID controller then controls the operation of the compensation fan 113 with atmospheric pressure as the target, for example, controlling the speed of the compensation fan 113, so that the compensation fan 113 compensates for the air pressure in the enthalpy difference wind tunnel 110, thereby ensuring that the air pressure in the enthalpy difference wind tunnel 110 is close to or equal to atmospheric pressure. This better replicates the cockpit environment and helps improve the accuracy of parameter calibration.

[0080] Optionally, refer to Figure 4 and Figure 5 The vehicle electric heating system parameter calibration device also includes an air guide transition section 240 and an expansion tank 250; the air guide transition section 240 is located between the outlet of the air conditioning module 140 and the enthalpy difference wind tunnel 110; the expansion tank 250 is connected to the heating pipe 130 and is used to supply coolant to the heating pipe 130.

[0081] Specifically, air guide transition sections 240 can be fabricated according to the shapes of the air outlet and defrost outlet of the air conditioning module 140, respectively. The two ends of the air guide transition sections 240 are connected to the outlet and enthalpy difference wind tunnel of the air conditioning module 140, respectively, and the connection parts are sealed with heat-insulating sealing tape. In this way, the air loss and heat loss of the air blowing out of the air conditioning module 140 can be reduced.

[0082] The expansion tank 250 is connected to the heating pipe 130, and coolant, such as a 50% ethylene glycol aqueous solution, can be added to the heating pipe 130 to facilitate heat transfer through the coolant.

[0083] Optionally, refer to Figure 4 and Figure 5The vehicle electric heating system parameter calibration device also includes a fourth measurement module 260; the fourth measurement module 260 is disposed in the environmental chamber 100, the distance between the fourth measurement module 260 and the wall of the environmental chamber 100 is greater than or equal to a preset value, the distance between the fourth measurement module 260 and the air conditioning module 140 is greater than or equal to a preset value, and the fourth measurement module 260 is used to measure the actual ambient temperature of the environmental chamber 100; the fourth measurement module 260 is connected to the control module 160, and the control module 160 is used to calculate the heat absorbed by the air side based on the actual ambient temperature, the air outlet temperature of the air conditioning module and the air outlet flow rate.

[0084] Specifically, the preset value could be, for example, 1m, 0.9m, or other values; this embodiment is not limited to any particular value. By setting the distance between the fourth measuring module 260 and the wall of the environmental chamber 100 to be greater than or equal to the preset value, and the distance between the fourth measuring module 260 and the air conditioning module 140 to be greater than or equal to the preset value, the distance between the fourth measuring module 260 and the wall and air conditioning module 140 is relatively large. This avoids a large difference between the wall temperature and the air temperature, which would lead to a large deviation in the actual ambient temperature measured by the fourth measuring module 260. Furthermore, it also avoids a large difference between the temperature at the air outlet of the air conditioning module 140 and the air temperature, which would also lead to a large deviation in the actual ambient temperature measured by the fourth measuring module 260. Thus, the accuracy of the actual ambient temperature detection can be improved, which is beneficial to improving the accuracy of the calculation of heat absorption on the air side, thereby improving the accuracy of the parameter calibration of the electric heater 120.

[0085] Optionally, refer to Figure 4 and Figure 5 The fourth measurement module 260 includes multiple ambient temperature sensors 261, which are electrically connected to the control module 160. The control module 160 uses the difference between the ambient temperatures measured by the multiple ambient temperature sensors 261 as the final actual ambient temperature. This further improves the accuracy of actual ambient temperature detection.

[0086] For example, the specific heat capacity of air is C. pa The air density is ρ a The airflow rate of air conditioning module 140 is V. a The air outlet temperature of air conditioning module 140 is T. b The air intake temperature of the air conditioning module 140 (which is also the actual ambient temperature of the environmental chamber 100) is T. a The heat absorbed by the air side is Q. a Then Q a =C pa ·ρ a ·ρ a ·(T b -T aThis allows us to calculate the heat absorbed by the air side based on the actual ambient temperature, the air outlet temperature of the air conditioning module 140, and the air flow rate.

[0087] Optionally, the control module 160 calculates the heat absorption efficiency based on the heat absorbed on the air side and the heat released on the liquid side. For example, the heat absorption efficiency is the ratio of the heat absorbed on the air side to the heat released on the liquid side, i.e., the heat absorption efficiency. Therefore, it can be determined whether the heat absorption efficiency corresponding to the current control variable meets the requirements, and it is convenient to determine whether the current coolant flow rate and the air outlet flow rate of the air conditioning module 140 can be used as the target coolant flow rate and the target air conditioning air volume.

[0088] In this way, by calculating the heat absorbed by the air side, the heat released by the liquid side, the heat absorption efficiency, and the power consumption for each heating (corresponding to each set of control variables), it is easy to find the target coolant flow rate and the target air conditioning output volume when the heat absorption efficiency is high and the power consumption is low.

[0089] Optionally, refer to Figure 5 The first measurement module 111 includes an air flow sensor 111a and an air temperature sensor 111b. The air flow sensor 111a is connected to the control module 160 and is used to detect the air flow of the air conditioning module 140 and send the air flow to the control module 160. The air temperature sensor 111b is connected to the control module 160 and is used to detect the air temperature of the air conditioning module 140 and send the air temperature to the control module 160.

[0090] Specifically, the air flow sensor 111a can be a flow nozzle. The air flow sensor 111a and the air temperature sensor 111b are, for example, positioned on the side of the flow stabilizer 112 away from the air conditioning module 140, with the air temperature sensor 111b positioned between the air flow sensor 111a and the flow stabilizer 112. The compensating fan 113 is, for example, positioned on the side of the air flow sensor 111a away from the air conditioning module 140. In this way, the air temperature sensor 111b and the air flow sensor 111a can measure the temperature and flow rate of the stabilized air, making the measured air temperature and flow rate more consistent with the actual air temperature and flow rate in the cockpit, thus improving the accuracy of the air temperature and flow rate measurements.

[0091] Optionally, refer to Figure 5 The first measurement module 111 also includes an air pressure sensor 111c; the air pressure sensor 111c is located between the flow stabilizer 112 and the outlet of the air conditioning module 140, the air pressure sensor 111c is connected to the control module 160, and the air pressure sensor 111c is used to detect the actual air pressure of the enthalpy difference wind tunnel 110.

[0092] Specifically, the air pressure sensor 111c is located between the flow stabilizer 112 and the outlet of the air conditioning module 140, which can more accurately measure the air pressure discharged by the air conditioning module 140. This makes it easier for the control module 160 to control the speed of the compensation fan 113 based on the atmospheric pressure and the actual air pressure detected by the air pressure sensor 111c, thereby compensating for the pressure of the enthalpy difference wind tunnel 110.

[0093] Based on the above technical solutions, optionally, refer to Figure 5 The vehicle electric heating system parameter calibration device also includes a communication module 270, which is connected between the electric heater 120 and the control module 160. The control module 160 sends control signals to the electric heater 120 through the communication module 270 to control the power of the electric heater 120. The communication module 270 is implemented, for example, via Controller Area Network (CAN) communication. Thus, parameter calibration can be performed in a constant power control mode, i.e., controlling the electric heater 120 to output constant power, ensuring low power consumption under any circumstances. This allows selection based on the following conditions: the heat release on the liquid side is within a preset heat range; the ratio of heat absorption on the air side to heat release on the liquid side (heat absorption efficiency) is within a preset ratio range; the outlet water temperature of the electric heater 120 is within a preset temperature range; the difference between the actual temperature and the set temperature of the enthalpy difference wind tunnel 110 is within a preset threshold range; or the heat release efficiency of the electric heater 120 is within a first preset efficiency range. In these cases, the corresponding coolant flow rate is the target coolant flow rate, and the corresponding air conditioning output volume is the target air conditioning output volume.

[0094] In some embodiments, the output of the electric heater 120 can be controlled according to a constant outlet water temperature, that is, the outlet water temperature of the electric heater 120 is controlled to be a constant outlet water temperature, so that the outlet water temperature is within a preset temperature range under any circumstances. This allows for the selection of liquid-side heat release within a preset heat range and power consumption within a preset power range, or the ratio of air-side heat absorption to liquid-side heat release (heat absorption efficiency) within a preset ratio range and power consumption within a preset power range, or the difference between the actual temperature of the enthalpy difference wind tunnel 110 and the set temperature within a preset threshold range and power consumption within a preset power range, or the heat release efficiency of the electric heater 120 within a first preset efficiency range and power consumption within a preset power range. In this case, the corresponding coolant flow rate is the target coolant flow rate, and the corresponding air conditioning air volume is the target air conditioning air volume.

[0095] Optionally, the communication module 270 is connected between the circulating water pump 210 and the control module 160. The control module 160 sends a speed control signal to the circulating water pump 210 through the communication module 270. In this way, the speed of the circulating water pump 210 is controlled, thereby controlling the flow rate of the coolant.

[0096] Optionally, the communication module 270 is connected between the air conditioning module 140 and the control module 160. The control module 160 transmits an airflow control signal to the air conditioning module 140 through the communication module 270. This enables control of the airflow from the air conditioning module 140, facilitating the modification of control variables to obtain the power consumption of the electric heater, the heat released by the liquid side, and the heat absorbed by the air side corresponding to different control variables. This allows for the selection of the target coolant flow rate and target air conditioning airflow based on the power consumption of the electric heater, the heat released by the liquid side, and the heat absorbed by the air side.

[0097] It should be noted that, in order to distinguish between the connections of components in the pipeline and the connections between the control module 160 and the components, Figure 5 and Figure 3 The connection between the control module 160 and the device is shown by dashed lines.

[0098] This embodiment also provides a method for calibrating parameters of a vehicle electric heating system. This method is implemented by the vehicle electric heating system parameter calibration device provided in any of the above embodiments, and the vehicle electric heating system parameter calibration method is executed by the above control module. Figure 6 This is a flowchart of a method for calibrating parameters of a vehicle electric heating system provided in an embodiment of the present invention. (Refer to...) Figure 6 The calibration methods for vehicle electric heating system parameters include:

[0099] S101. After the electric heater heats the coolant and the air conditioning module blows the heat from the heated coolant into the enthalpy difference wind tunnel, the heat absorbed by the air side is determined based on the airflow rate and air temperature of the air conditioning module measured by the first measurement module.

[0100] Specifically, refer to Figure 1 , Figure 2 and Figure 3 During calibration, the operating mode of the air conditioning module 140 is first selected (e.g., defrost mode or foot blowing mode), and the values ​​of the control variables are set. The power supply 150 is then turned on, supplying power to the electric heater 120. The electric heater 120 heats the coolant, and the warm air duct 130 transfers the heated coolant from the electric heater 120 to the air conditioning module 140. The air conditioning module 140 blows the heat from the heated coolant into the enthalpy difference wind tunnel 110. The first measurement module 111 in the enthalpy difference wind tunnel 110 measures the airflow rate and air temperature of the air conditioning module 140. The control module 160 calculates the heat absorbed by the air side based on the airflow rate and air temperature.

[0101] S102. Determine the power consumption and heat release on the liquid side of the electric heater corresponding to each set of control variables, and determine the target coolant flow rate and target air conditioning output volume based on the power consumption, heat release on the liquid side and heat absorption on the air side; wherein, the control variables include the coolant flow rate, the air conditioning module output volume and the ambient temperature of the environmental chamber.

[0102] Specifically, first, the values ​​of the control variables are set, and the heat absorbed by the air side, power consumption, and heat released by the liquid side under the current control variables are calculated. Then, the value of at least one of the control variables is changed, namely, the coolant flow rate, the air output volume of the air conditioning module 140, and the ambient temperature of the environmental chamber 100. The heat absorbed by the air side, power consumption, and heat released by the liquid side under the current control variables are calculated again. This process is repeated to obtain multiple sets of power consumption, heat released by the liquid side, and heat absorbed by the air side under different control variables, thus obtaining multiple sets of correspondences between the control variables and power consumption, heat released by the liquid side, and heat absorbed by the air side. By obtaining multiple sets of correspondences between the control variables and power consumption, heat released by the liquid side, and heat absorbed by the air side, the target coolant flow rate and target air conditioning air output volume under the ambient temperature can be selected according to the target requirements, thereby achieving the calibration of the coolant flow rate and air conditioning air output volume. By controlling the coolant flow rate according to the predetermined target coolant flow rate and the air conditioning output volume according to the predetermined target air conditioning output volume, the comfort requirements of the cockpit can be met while minimizing the power consumption of the electric heater 120, avoiding the impact of heating and defrosting on the vehicle's power battery range, and improving the user experience.

[0103] The vehicle electric heating system parameter calibration method provided in this embodiment of the invention is implemented by the vehicle electric heating system parameter calibration device provided in any embodiment of the invention, and the vehicle electric heating system parameter calibration method provided in this embodiment of the invention has the same beneficial effects as any of the above-described implementation schemes.

[0104] Based on the above technical solutions, Figure 7 This is a flowchart of another vehicle electric heating system parameter calibration method provided by an embodiment of the present invention. Optionally, refer to... Figure 7 The calibration methods for vehicle electric heating system parameters include:

[0105] S201. After the electric heater heats the coolant and the air conditioning module blows the heat from the heated coolant into the enthalpy difference wind tunnel, the operation of the compensation fan is controlled according to the atmospheric pressure and the actual air pressure of the enthalpy difference wind tunnel, following a closed-loop control strategy.

[0106] Specifically, refer to Figure 5The closed-loop control strategy is implemented, for example, through a proportional-integral-derivative (PID) controller. The control module 160 inputs the atmospheric pressure and the actual air pressure of the enthalpy difference wind tunnel 110 to the PID controller. The PID controller then controls the operation of the compensation fan 113 with atmospheric pressure as the target, for example, by controlling the rotational speed of the compensation fan 113, so that the compensation fan 113 compensates for the air pressure of the enthalpy difference wind tunnel 110, thereby ensuring that the air pressure of the enthalpy difference wind tunnel 110 is close to or equal to the atmospheric pressure, better replicating the environment of the cockpit, and helping to improve the accuracy of parameter calibration.

[0107] S202. Based on the preset ambient temperature and the actual ambient temperature of the environmental chamber, control the operation of the turbulence fan according to the closed-loop control strategy.

[0108] Specifically, the preset ambient temperature of the environmental chamber is determined according to the characteristic ambient temperatures (-30℃, -25℃, -20℃, and -15℃, etc.) required for the test conditions, and the temperature of the environmental chamber is set according to the preset ambient temperature. Throughout the calibration process, the turbulence fan of the environmental chamber 100 runs continuously, ensuring stable and uniform temperature and airflow in the environmental chamber. The closed-loop control strategy is implemented, for example, through a proportional-integral-derivative (PID) controller. The control module inputs the preset ambient temperature and the actual ambient temperature of the environmental chamber to the PID controller, which then controls the operation of the turbulence fan with the preset ambient temperature as the target, for example, controlling the speed of the turbulence fan, so that the actual ambient temperature of the environmental chamber is close to or equal to the preset ambient temperature. This facilitates the measurement of the airflow and outlet temperature of the air conditioning module at the preset ambient temperature, and facilitates the determination of the power consumption and liquid-side heat release of the electric heater at the preset ambient temperature. This allows for the selection of the target coolant flow rate and target air conditioning output volume at the preset ambient temperature, thus achieving the calibration of the electric heating system parameters.

[0109] S203. Determine the heat absorbed on the air side based on the airflow and air temperature of the air conditioning module measured by the first measurement module.

[0110] S204. Determine the power consumption and heat release on the liquid side of the electric heater corresponding to each set of control variables, and determine the target coolant flow rate and target air conditioning output volume based on the power consumption, heat release on the liquid side and heat absorption on the air side; wherein, the control variables include the coolant flow rate, the air conditioning module output volume and the ambient temperature of the environmental chamber.

[0111] It should be noted that the operation of the compensation fan in step S201 is controlled according to the closed-loop control strategy based on atmospheric pressure and the actual air pressure of the enthalpy difference wind tunnel, and the operation of the turbulence fan in step S202 is controlled according to the closed-loop control strategy based on the preset ambient temperature and the actual ambient temperature of the environmental chamber. These strategies can be continuously executed throughout the parameter calibration process. That is, while steps S203 and S204 are being executed, the strategies in step S201 (controlling the compensation fan according to the closed-loop control strategy based on atmospheric pressure and the actual air pressure of the enthalpy difference wind tunnel) and in step S202 (controlling the turbulence fan according to the closed-loop control strategy based on the preset ambient temperature and the actual ambient temperature of the environmental chamber) can also be executed. This ensures that the actual ambient temperature of the environmental chamber tends to the preset temperature and the air pressure of the enthalpy difference wind tunnel approaches atmospheric pressure during the calibration process, thereby ensuring the accuracy of the parameter calibration.

[0112] Based on the above technical solutions, optionally, before determining the air-side heat absorption in step S203 based on the airflow rate and air temperature of the air conditioning module measured by the first measuring module, the method further includes:

[0113] After the coolant flow rate, the electric heater outlet water temperature, and the air conditioning module outlet air temperature have all remained stable for a first preset time, or when the rate of change of the coolant flow rate, the rate of change of the electric heater outlet water temperature, and the rate of change of the air conditioning module outlet air temperature are all less than preset change values, the air conditioning module outlet air flow rate and outlet air temperature are obtained from the first measurement module, the actual coolant flow rate is obtained from the second measurement module, the electric heater outlet water temperature and inlet water temperature are obtained from the third measurement module, the actual ambient temperature is obtained from the fourth measurement module, and the electric heater power consumption is obtained. This allows the control module to calculate the air-side heat absorption based on the air conditioning module outlet air flow rate, air conditioning module outlet air temperature, and actual ambient temperature; calculate the liquid-side heat release based on the actual coolant flow rate, electric heater inlet water temperature, and electric heater outlet water temperature; calculate the heat release efficiency based on the liquid-side heat release and electric heater power consumption; and calculate the heat absorption efficiency based on the liquid-side heat release and air-side heat absorption. This allows the control module to acquire the power consumption, heat release, and heat absorption of the electric heater corresponding to each set of control variables, enabling the control module to determine the target coolant flow rate and target air conditioning output volume based on these parameters. The first preset duration can be, for example, 30 minutes, 25 minutes, or 20 minutes, and the first change value can be 1% or 2%, which is not limited in this embodiment. After the coolant flow rate, the outlet water temperature of the electric heater, and the air conditioning module's outlet temperature have all remained stable for the first preset duration, or when the rate of change of the coolant flow rate, the rate of change of the outlet water temperature of the electric heater, and the rate of change of the air conditioning module's outlet temperature are all less than the preset change values, the actual coolant flow rate, the outlet water temperature of the electric heater, the inlet water temperature of the electric heater, the actual ambient temperature, the air conditioning module's outlet air flow rate, and the air conditioning module's outlet air temperature are then acquired. This ensures the accuracy of each value acquisition and improves the accuracy of parameter calibration.

[0114] Optionally, the airflow rate and air temperature of the air conditioning module are obtained from the first measurement module, the actual flow rate of the coolant is obtained from the second measurement module, the outlet water temperature and inlet water temperature of the electric heater are obtained from the third measurement module, and the actual ambient temperature is obtained from the fourth measurement module, including:

[0115] The system acquires multiple airflow rates and temperatures from the air conditioning module via the first measurement module, multiple actual coolant flow rates from the second measurement module, multiple outlet and inlet water temperatures from the electric heater via the third measurement module, and multiple actual ambient temperatures from the fourth measurement module. This facilitates the calculation of multiple liquid-side heat releases and multiple air-side heat absorptions. The average of these liquid-side heat releases and the average of these air-side heat absorptions are used as the final liquid-side heat release value, allowing the control module to determine the target coolant flow rate and target air conditioning output volume based on these values. For example, setting the sampling period to 3 minutes, the sampling cycle to 5 seconds, and the number of samples to 60, the final liquid-side heat release value is the average of the 60 liquid-side heat release values, and the final air-side heat absorption value is the average of the 60 air-side heat absorption values. This further improves the accuracy of parameter calibration.

[0116] The technical solution of this embodiment obtains multiple sets of control variables by changing the control variables, and acquires the airflow rate, airflow temperature, actual coolant flow rate, outlet water temperature, inlet water temperature, and power consumption of the electric heater under each set of control variables. This yields the power consumption, liquid-side heat release, liquid-side heat absorption, heat absorption efficiency, and heat release efficiency of the electric heater under each set of control variables. The control module then determines the target coolant flow rate and target airflow rate based on the electric heater's power consumption, liquid-side heat release, and liquid-side heat absorption. By controlling the coolant flow rate according to the determined target coolant flow rate and the airflow rate according to the determined target airflow rate, the comfort requirements of the cabin are met while minimizing the power consumption of the electric heater 120, avoiding the impact of heating and defrosting on the vehicle's battery range, and improving the user experience.

[0117] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0118] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A parameter calibration device for a vehicle electric heating system, characterized in that, include: An environmental chamber, an enthalpy difference wind tunnel, an electric heater, warm air ducts, an air conditioning module, a power supply, and a control module are included; the enthalpy difference wind tunnel, the electric heater, the warm air ducts, the air conditioning module, and the control module are located inside the environmental chamber. The power source is connected to the electric heater, and the power source is used to supply power to the electric heater; The heating duct is connected between the electric heater and the air conditioning module, and coolant is provided in the heating duct; the electric heater is used to heat the coolant. The enthalpy difference wind tunnel is equipped with a first measurement module, which is located at the air outlet of the air conditioning module. The air conditioning module is used to blow the heat of the heated coolant into the enthalpy difference wind tunnel. The first measurement module is used to measure the air flow rate and air temperature of the air conditioning module. The control module is connected to the first measurement module. The control module is used to determine the heat absorbed by the air side based on the air flow rate and the air temperature, and to determine the power consumption of the electric heater and the heat released by the liquid side corresponding to each set of control variables. The control module is also used to determine the target coolant flow rate and the target air conditioning output volume based on the power consumption, the heat released by the liquid side, and the heat absorbed by the air side. The control variables include the coolant flow rate, the air output volume of the air conditioning module, and the ambient temperature of the environmental chamber.

2. The apparatus according to claim 1, characterized in that, The device also includes a circulating water pump, a second measurement module, and a third measurement module; The circulating water pump is installed on the heating pipe and is connected between the electric heater and the air conditioning module. The circulating water pump is used to transfer the coolant heated by the electric heater to the air conditioning module. The control module is connected to the control terminal of the circulating water pump. The control module is used to control the speed change of the circulating water pump in order to control the flow rate change of the coolant. The second measuring module is installed on the heating air duct, and the second measuring module is used to measure the actual flow rate of coolant in the heating air duct; The third measuring module is connected to the control module. The third measuring module is used to detect the outlet water temperature and the inlet water temperature of the electric heater, and send the outlet water temperature and the inlet water temperature to the control module. The control module is connected to the second measurement module. The control module is used to obtain the actual flow rate of the coolant and calculate the heat released on the liquid side based on the actual flow rate of the coolant, the outlet water temperature and the inlet water temperature.

3. The apparatus according to claim 1, characterized in that, The enthalpy difference wind tunnel is also equipped with a flow stabilizer and a compensating fan; The flow stabilizer is disposed at the outlet of the air conditioning module, and the flow stabilizer is used to stabilize the air blown out by the air conditioning module; The compensating fan is connected to the control module, which controls the operation of the compensating fan according to the atmospheric pressure and the actual air pressure of the enthalpy difference wind tunnel, following a closed-loop control strategy.

4. The apparatus according to claim 1, characterized in that, The device also includes an air guide transition section and an expansion tank; The air guide transition section is located between the outlet of the air conditioning module and the enthalpy difference wind tunnel; The expansion tank is connected to the heating air duct, and the expansion tank is used to supply the coolant to the heating air duct.

5. The apparatus according to claim 1, characterized in that, The device also includes a fourth measurement module; The fourth measuring module is installed in the environmental chamber. The distance between the fourth measuring module and the wall of the environmental chamber is greater than or equal to a preset value. The distance between the fourth measuring module and the air conditioning module is greater than or equal to a preset value. The fourth measuring module is used to measure the actual ambient temperature of the environmental chamber. The fourth measurement module is connected to the control module, and the control module is used to calculate the heat absorbed by the air side based on the actual ambient temperature, the air outlet temperature of the air conditioning module, and the air outlet flow rate.

6. The apparatus according to claim 1, characterized in that, The first measurement module includes an air flow sensor and an air temperature sensor; The air flow sensor is connected to the control module. The air flow sensor is used to detect the air flow rate of the air conditioning module and send the air flow rate to the control module. The air temperature sensor is connected to the control module. The air temperature sensor is used to detect the air outlet temperature of the air conditioning module and send the air outlet temperature to the control module.

7. The apparatus according to claim 3, characterized in that, The first measurement module also includes an air pressure sensor; The air pressure sensor is located between the flow stabilizer and the outlet of the air conditioning module. The air pressure sensor is connected to the control module and is used to detect the actual air pressure of the enthalpy difference wind tunnel.

8. A method for calibrating parameters of a vehicle electric heating system, characterized in that, The method is implemented by the vehicle electric heating system parameter calibration according to any one of claims 1-7, the device comprising: an environmental chamber, an enthalpy difference wind tunnel, an electric heater, a heating air duct, an air conditioning module, a power supply, and a control module; the enthalpy difference wind tunnel, the electric heater, the heating air duct, the air conditioning module, and the control module are located within the environmental chamber; the power supply is connected to the electric heater, the heating air duct is connected between the electric heater and the air conditioning module, and coolant is disposed in the heating air duct; a first measurement module is disposed in the enthalpy difference wind tunnel, the enthalpy difference wind tunnel is disposed at the air outlet of the air conditioning module, and the control module is connected to the first measurement module; the method is executed by the control module; the method includes: After the electric heater heats the coolant and the air conditioning module blows the heat from the heated coolant into the enthalpy difference wind tunnel, the heat absorbed on the air side is determined based on the airflow rate and air temperature of the air conditioning module measured by the first measuring module. The power consumption and heat release on the liquid side of the electric heater corresponding to each set of control variables are determined, and the target coolant flow rate and target air conditioning output volume are determined based on the power consumption, the heat release on the liquid side and the heat absorption on the air side; wherein, the control variables include the coolant flow rate, the air conditioning module output volume and the ambient temperature of the environmental chamber.

9. The method according to claim 8, characterized in that, The enthalpy difference wind tunnel is also equipped with a compensating fan, which is connected to the control module; the method further includes: The operation of the compensation fan is controlled according to the atmospheric pressure and the actual air pressure of the enthalpy difference wind tunnel, following a closed-loop control strategy.

10. The method according to claim 8, characterized in that, The environmental chamber is also equipped with a turbulence fan, which is connected to the control module; the method further includes: The operation of the turbulence fan is controlled according to the preset ambient temperature and the actual ambient temperature of the environmental chamber, following a closed-loop control strategy.

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