Air volume control method and device of vehicle air conditioning system and vehicle

Abstract

The embodiment of the invention relates to the technical field of vehicles, and discloses an air volume control method and device of a vehicle air conditioning system and a vehicle. According to a preset mapping relation and the target air volume of the partition air ducts, the outlet pressure of an air blower and the target air door opening degree of each partition air duct are determined; wherein the preset mapping relation is used for representing the corresponding relation among the pressure, the air volume and the air door opening degree; according to the outlet pressure of the air blower, the target air volume of each partition air duct and a preset fan characteristic curve, the target rotating speed of the air blower is determined; wherein the preset fan characteristic curve is used for representing the corresponding relation among the rotating speed, the pressure difference and the total air volume; and according to the target rotating speed and the target air door opening degree, the air blower and the air door are controlled, so that the partition air duct outputs the target air volume. According to the technical scheme, the problem that in the prior art, the control precision of the air volume of the air conditioner partition is low can be solved.

Description

Technical Field

[0001] This invention relates to the field of vehicle technology, specifically to a method, device, and vehicle for controlling the air volume of a vehicle air conditioning system. Background Technology

[0002] With the development of intelligent and multifunctional vehicles, multi-zone climate control is widely used. Multi-zone climate control breaks the limitation of uniform temperature and airflow throughout the vehicle, allowing for personalized temperature and airflow adjustments in different areas of the cabin, thus improving cabin comfort and user experience.

[0003] Currently, most systems are in the development stage, where parameter tables for the control parameters of air conditioning systems under different operating conditions are tested and calibrated. In actual use, based on the user's airflow requirements, the parameter tables are consulted to determine the control parameters of the current air conditioning system to achieve airflow control in different zones.

[0004] However, this method is based on parameter control using a lookup table calibrated by full-condition testing. Full-condition testing cannot exhaust all dynamic variables in real-world vehicle use, resulting in a disconnect between control parameters and user airflow requirements. Summary of the Invention

[0005] In view of the above problems, embodiments of the present invention provide a method, device and vehicle for controlling the air volume of a vehicle air conditioning system, which is used to solve the problem of low accuracy of air volume control in air conditioning zones in the prior art.

[0006] According to one aspect of the present invention, a method for controlling the air volume of a vehicle air conditioning system is provided, the air conditioning system including a blower and a plurality of zone air ducts, each of the zone air ducts including at least one damper, the method comprising:

[0007] Obtain the target airflow for each of the aforementioned partition ducts;

[0008] Based on the preset mapping relationship and the target air volume of the partitioned air duct, the outlet pressure of the blower and the target damper opening of each partitioned air duct are determined; wherein, the preset mapping relationship is used to characterize the correspondence between pressure, air volume and damper opening.

[0009] The target speed of the blower is determined based on the outlet pressure of the blower, the target air volume of each zone air duct, and the preset blower characteristic curve; wherein, the preset blower characteristic curve is used to characterize the correspondence between the speed, pressure difference, and total air volume.

[0010] The blower and the damper are controlled according to the target rotation speed and the target damper opening so that the zoned air duct outputs the target air volume.

[0011] According to another aspect of the present invention, an air volume control device for a vehicle air conditioning system is provided, the air conditioning system including a blower and a plurality of zone air ducts, each of the zone air ducts including at least one damper, comprising:

[0012] The acquisition module is used to acquire the target air volume for each of the partitioned air ducts;

[0013] The first determining module is used to determine the outlet pressure of the blower and the target damper opening of each partition duct according to a preset mapping relationship and the target air volume of the partition duct; wherein, the preset mapping relationship is used to characterize the correspondence between pressure, air volume and damper opening.

[0014] The second determining module is used to determine the target speed of the blower based on the outlet pressure of the blower, the target air volume of each of the partitioned air ducts, and a preset blower characteristic curve; wherein, the preset blower characteristic curve is used to characterize the correspondence between the speed, pressure difference, and total air volume.

[0015] The control module is used to control the blower and the damper according to the target rotation speed and the target damper opening, so that the zoned air duct outputs the target air volume.

[0016] According to another aspect of the present invention, an electronic device is provided, including: a processor, a memory, a communication interface, and a communication bus, wherein the processor, the memory, and the communication interface communicate with each other through the communication bus;

[0017] The memory is used to store at least one executable instruction, which causes the processor to perform the operation of the air volume control method of the vehicle air conditioning system described above.

[0018] According to another aspect of the present invention, a vehicle is provided, comprising: a controller and an air conditioning system, the air conditioning system including a blower and a plurality of zone air ducts, each of the zone air ducts including at least one damper; the controller performing the operation of the air volume control method of the vehicle air conditioning system described above.

[0019] According to another aspect of the present invention, a computer-readable storage medium is provided, the storage medium storing at least one executable instruction that causes an airflow control device of an electronic device / vehicle air conditioning system to perform the following operations:

[0020] Obtain the target airflow for each of the aforementioned partition ducts;

[0021] Based on the preset mapping relationship and the target air volume of the partitioned air duct, the outlet pressure of the blower and the target damper opening of each partitioned air duct are determined; wherein, the preset mapping relationship is used to characterize the correspondence between pressure, air volume and damper opening.

[0022] The target speed of the blower is determined based on the outlet pressure of the blower, the target air volume of each zone air duct, and the preset blower characteristic curve; wherein, the preset blower characteristic curve is used to characterize the correspondence between the speed, pressure difference, and total air volume.

[0023] The blower and the damper are controlled according to the target rotation speed and the target damper opening so that the zoned air duct outputs the target air volume.

[0024] This invention first obtains the target air volume for each zone duct. Based on a preset mapping relationship and the target air volume, the blower's outlet pressure and the target damper opening for each zone duct can be calculated. Then, the target speed of the blower is determined by combining the blower's outlet pressure, the target air volume of all zone ducts, and the preset blower characteristic curve. Finally, the blower and damper are controlled according to the target speed and target damper opening to ensure that each zone duct outputs the required target air volume. The preset mapping relationship and blower characteristic curve provided in this invention are universal principle mappings, not parameter sets under fixed operating conditions. Regardless of the zone air volume set by the user or the dynamic operating conditions (such as arbitrary vehicle speed or arbitrary ambient temperature), accurate parameters can be obtained through principle derivation. There is no problem of uncovered operating conditions, avoiding the disconnect between control parameters and user needs, and improving the accuracy of zone duct air volume control.

[0025] The above description is merely an overview of the technical solutions of the embodiments of the present invention. In order to better understand the technical means of the embodiments of the present invention and to implement them in accordance with the contents of the specification, and to make the above and other objects, features and advantages of the embodiments of the present invention more apparent and understandable, specific embodiments of the present invention are described below. Attached Figure Description

[0026] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0027] Figure 1 A schematic diagram of the air conditioning system provided by the present invention is shown;

[0028] Figure 2 A flowchart of a first embodiment of the airflow control method for a vehicle air conditioning system provided by the present invention is shown;

[0029] Figure 3This invention illustrates a schematic diagram of the structure of a zoned air duct in an air conditioning system provided by the present invention.

[0030] Figure 4 A flowchart of a second embodiment of the airflow control method for a vehicle air conditioning system provided by the present invention is shown;

[0031] Figure 5 A schematic diagram of an embodiment of the air volume control device for a vehicle air conditioning system provided by the present invention is shown.

[0032] Figure 6 A schematic diagram of an embodiment of the electronic device provided by the present invention is shown. Detailed Implementation

[0033] Exemplary embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein.

[0034] In related technologies, the zone airflow control of multi-zone air conditioning systems largely relies on parameter tables calibrated through full-condition testing during the development phase. This involves pre-setting numerous fixed operating conditions (such as specific vehicle speed, specific zone airflow combinations, and specific ambient temperatures), testing the corresponding fan speed and damper opening for each condition, and storing these parameters in a table. In actual use, the air conditioning controller must first determine which pre-stored condition the current operating condition belongs to, and then directly call the corresponding parameters. If the current operating condition is not within the pre-stored range (e.g., the user-set zone airflow combination is not calibrated, or the vehicle speed is between two calibrated levels), control parameters can only be obtained through interpolation estimation or nearest-neighbor matching. This can lead to estimated speeds that are either too high or too low, failing to accurately match the user-set airflow, thus deviating from actual needs.

[0035] Therefore, the inventors of this invention began to consider how to break through the dependence on fixed test parameter tables and achieve more accurate air volume control that is more adaptable to dynamic operating conditions. They realized that they could start from the core principle of fluid mechanics, and establish a principle-based mapping relationship between air volume, pressure and damper opening, as well as the fan characteristic curves between the pressure difference at both ends of the blower and the air volume and speed. This would directly link the user's air volume requirements for each zone with the key control parameters of the air conditioning system (blower speed and damper opening). In this way, there is no need to rely on a test parameter table with limited coverage of all operating conditions. Based on the air volume requirements set by the user for each zone, the corresponding blower speed and the opening of each damper can be accurately derived and determined by using the established principle-based mapping relationship and fan characteristic curves. This ultimately solves the problem of the disconnect between control parameters and user air volume requirements in traditional methods and improves the accuracy of air volume control.

[0036] The execution subject of this invention can be an electronic device with processing capabilities, such as an existing controller in a vehicle, like an air conditioning controller, or a separately set controller. The controller can be an electronic control unit (ECU), a microcontroller unit (MCU), etc., and this invention does not limit the scope of the invention.

[0037] Figure 1 A schematic diagram of the air conditioning system provided by the present invention is shown. Figure 1 As shown, the air conditioning system includes a blower and multiple zoned air ducts, each zoned air duct including at least one damper. It should be noted that... Figure 1 The following is an illustration using an example that includes four zoned air ducts.

[0038] like Figure 1 As shown, the air conditioning system also includes a main air duct, inside which a heat exchange component 1 is installed. Each zone air duct is also equipped with a heat exchange component 2. The main air duct is connected to the blower and multiple zone air ducts.

[0039] A blower is used to deliver airflow. For example, this blower can be driven by a motor to rotate an impeller, pressurizing outside air (external circulation) or inside the vehicle (internal circulation) and then delivering it into the main air duct, providing a unified airflow source for all zone air ducts. The speed of this blower determines the total airflow supplied by the air conditioning system, and the airflow of all subsequent zones depends on its output airflow pressure.

[0040] The main air duct (main pipe) is used to pre-treat the airflow output by the blower by temperature regulation based on the heat exchange component 1, so that the air can be cooled / heated first.

[0041] The heat exchange component 1 is integrated inside the main air duct, close to the blower side, and located before the main air duct branches. This heat exchange component 1 is used to centrally regulate the temperature of the airflow delivered by the blower, uniformly raising or lowering the temperature, thereby reducing the load on subsequent zone temperature control.

[0042] Each zone air duct (manifold) corresponds independently to an air control zone, such as the left front zone, left rear zone, right front left zone, and right rear right zone. Each zone air duct has a built-in heat exchange component 2 and at least one damper to achieve independent airflow control of the zone air duct.

[0043] Heat exchange component 2, integrated inside each zone air duct and located between the zone air duct inlet and the damper, is a secondary temperature control component for each zone. Based on the centralized temperature regulation pretreatment by heat exchange component 1, heat exchange component 2 performs refined and personalized temperature and airflow control on the airflow entering the zone air duct.

[0044] It should be noted that the heat exchange components mentioned above can be evaporators, warm air cores, indoor condensers, or positive temperature coefficient (PTC) heaters, and this embodiment of the invention is not limited to these components.

[0045] The dampers are located at the end of each zone's air duct, near the passenger compartment's air outlet. These dampers are all electrically operated, with blades rotated by a motor, allowing for 0%-100% damper opening adjustment. These dampers can be used to adjust the air outlet area of ​​each zone's air duct, thereby controlling the airflow to that zone. A larger damper opening results in a larger air outlet area and a greater airflow; a smaller opening results in a smaller air outlet area and a less airflow, thus achieving independent airflow control for each zone.

[0046] It should be noted that each zone air duct should be equipped with at least one damper, or multiple dampers can be configured, such as a face-blowing damper and a foot-blowing damper to correspond to the face-blowing air outlet and the foot-blowing air outlet respectively; or a defogging damper, a face-blowing damper, and a foot-blowing damper to correspond to the defogging air outlet, the face-blowing air outlet, and the foot-blowing air outlet respectively. In this embodiment of the invention, the number of dampers set in each zone air duct is not limited, and can be set according to actual needs.

[0047] It is understandable that the opening degree of the damper corresponds to the air blowing mode of each zone air duct. For example, if the user selects to turn on the face blowing mode and the defogging mode for the left front zone air duct, the opening degree of the face blowing damper and the defogging damper will be controlled accordingly, while the opening degree of the foot blowing damper will be 0%.

[0048] Optionally, the air conditioning system may also include a recirculation damper and an air conditioning filter. The recirculation damper is located at the front end of the blower and is used to control the air source (indoor air / outdoor air) and adjust the internal / external circulation ratio (e.g., full internal, full external, mixed circulation). The circulation state affects the inlet pressure of the blower. The air conditioning filter is installed between the air intake and the blower and is used to filter dust, odors, PM2.5 and other impurities in the air to ensure that the airflow sent into the main air duct is clean and to avoid contaminating heat exchange components and affecting the health of the occupants.

[0049] Through this air conditioning system, air enters the air conditioning filter after passing through the air inlet of the blower, is then pressurized by the blower and delivered to the main air duct. After centralized temperature regulation by the heat exchange component 1, the air is delivered separately through multiple zone air ducts. In the zone air ducts, secondary temperature regulation is performed based on the heat exchange component 2. Combined with the opening of the dampers in the zone air ducts, the air with the required air volume and temperature is output through the air outlet.

[0050] Figure 2 A flowchart of a first embodiment of the airflow control method for a vehicle air conditioning system provided by the present invention is shown. Figure 2As shown, the method includes the following steps:

[0051] Step 110: Obtain the target airflow for each zone duct.

[0052] For example, a zoned air duct refers to an airflow delivery branch pipe for a single, independent air-controlled zone in an air conditioning system. The target air volume refers to the desired airflow volumetric flow rate that the corresponding zoned air duct needs to output. It is understood that the target air volume can be a fixed value manually set by the user. For example, the user determines the target air volume for a zone by setting its fan speed level. In other words, the air conditioning controller has a pre-defined correspondence between fan speed levels and target air volumes, and can automatically determine the target air volume after receiving the user-set fan speed level. Alternatively, it can be an adaptive value dynamically calculated by the air conditioning controller based on factors such as the size of the zone, the number of occupants, and the ambient temperature. This application embodiment does not limit the numerical range or setting method of the target air volume.

[0053] In one example, the air conditioning controller receives the target airflow set by the user for each zone air duct via the zone airflow adjustment knob on the vehicle's air conditioning control panel; alternatively, the air conditioning controller can dynamically calculate the target airflow for each zone air duct based on the difference between the actual temperature detected by the temperature sensor of each zone and the target temperature through a preset processing algorithm. For example, if the actual temperature in the driver's area is 2°C higher than the target temperature, the target airflow for that zone air duct will be automatically increased to 0.015 m³ / s.

[0054] Step 120: Determine the blower outlet pressure and the target damper opening for each zone duct based on the preset mapping relationship and the target air volume of the zone duct.

[0055] For example, the preset mapping relationship refers to the correspondence between pressure, air volume and damper opening established based on the principles of fluid mechanics, and is unrelated to the current operating conditions of the air conditioning system.

[0056] The outlet pressure of a blower refers to the pressure value of the airflow output by the blower after it has been pressurized.

[0057] The target damper opening refers to the percentage value (0%-100%) corresponding to the opening and closing angle that the electric damper in the zone duct needs to achieve. The opening size determines the air outlet area of ​​the damper, which in turn affects the actual air volume of the zone. The damper opening and the air outlet area are positively correlated; 100% opening corresponds to the maximum air outlet area, and 0% opening corresponds to complete closure.

[0058] In one example, the air conditioning controller can first retrieve a pre-stored preset mapping relationship. For each zone air duct, assuming the damper opening of the zone air duct is 100%, the target air volume of the zone air duct is substituted into the preset mapping relationship to calculate the required inlet pressure of each zone air duct. The maximum value among the required inlet pressures of each zone air duct is taken as the outlet pressure of the blower to meet the needs of the zone air duct with the largest air volume demand. Then, the outlet pressure of the blower and the target air volume of each zone air duct are substituted into the preset mapping relationship again to calculate the target damper opening of each zone air duct.

[0059] Step 130: Determine the target speed of the blower based on the blower's outlet pressure, the target air volume of each zone's air duct, and the preset blower characteristic curve.

[0060] For example, the preset fan characteristic curve refers to the curve obtained based on blower characteristic experiments and is used to characterize the relationship between speed, pressure difference, and total air volume. Here, pressure difference refers to the difference between the blower's outlet pressure and inlet pressure; total air volume refers to the sum of the target air volumes of all zoned air ducts. It should be noted that this fan characteristic curve is essentially a law of fan characteristics, used to describe the relationship between the blower's speed, the inlet and outlet pressure difference, and the total output air volume, and is independent of the operating conditions of the air conditioning system.

[0061] The target speed of a blower refers to the rotational speed that the blower motor needs to reach, which is used to determine the blower's air supply capacity.

[0062] In one example, the air conditioning controller can first sum up the target air volume of all zone air ducts to obtain the total air volume; then, based on the determined outlet pressure and inlet pressure of the blower (such as standard atmospheric pressure), it can calculate the pressure difference between the two ends of the blower; finally, it can look up the blower speed corresponding to the total air volume and pressure difference in the preset blower characteristic curve to obtain the target speed.

[0063] Step 140: Control the blower and damper according to the target speed and target damper opening to ensure that the zoned air duct outputs the target air volume.

[0064] For example, controlling the blower and damper refers to outputting control signals through the air conditioning controller to drive the blower motor and the electric damper actuator. In this embodiment of the invention, the type of control signal is not limited; for example, it can be a pulse width modulation signal. It is understood that a closed-loop feedback mechanism can be incorporated into the control process, using an airflow sensor to detect the actual airflow in each zone in real time, and fine-tuning the speed and opening to ensure output accuracy.

[0065] In one example, the air conditioning controller converts the target speed into a motor control signal and sends it to the blower's motor controller. The motor controller drives the blower motor to accelerate to the target speed and operate stably. At the same time, the air conditioning controller converts the target damper opening into an opening control signal and sends the opening control signal to the electric damper actuator of each zone duct. The motor drives the damper blades to rotate to the target angle to ensure that all zone ducts output the target air volume.

[0066] In this embodiment, the air conditioning controller first obtains the target air volume for each zone's air duct. Based on a preset mapping relationship and the target air volume, it can calculate the blower's outlet pressure and the target damper opening for each zone's air duct. Then, combining the blower's outlet pressure, the target air volume for all zone's air ducts, and a preset blower characteristic curve, it determines the blower's target speed. Finally, based on the target speed and target damper opening, it controls the blower and dampers to operate, ensuring that each zone's air duct outputs the required target air volume. Through this method, the preset mapping relationship and blower characteristic curve are universal principle mappings, not parameter sets under fixed operating conditions. Regardless of the user's setting of the zone's air volume or the dynamic operating conditions (such as arbitrary vehicle speed or ambient temperature), accurate parameters can be derived through principle derivation, eliminating the problem of incomplete operating condition coverage. This avoids a disconnect between control parameters and user needs, improving the accuracy of zone air duct air volume control.

[0067] The principles behind the preset mapping relationship and the preset wind turbine characteristic curve will be explained below.

[0068] First, set the following three conditions:

[0069] (1) Since the air duct is not a regular flow channel, the air flow is considered to be in the form of turbulence;

[0070] (2) Ignore the compressibility of air (generally, the compressibility of air needs to be considered when the flow velocity reaches Mach 0.3 or higher).

[0071] (3) Ignoring the influence of altitude, the calculation is based on standard atmospheric pressure. At high altitudes, the blower inlet pressure and the electric air outlet outlet pressure are reduced to the local atmospheric pressure at the same time, which will offset some of the influence.

[0072] Secondly, refer to Figure 1 The air conditioning system shown is simplified as follows: Figure 3 The diagram shown is a structural schematic of a zoned air duct. Figure 3 A schematic diagram of a zoned air duct of the air conditioning system provided by the present invention is shown.

[0073] Understandably, reference Figure 3As shown, the flow path from the blower to the rear end of the evaporator is a sealed channel and a main pipe. The blower outlet to the evaporator outlet can be treated as a single unit, and the pressure at the evaporator outlet is used as the blower outlet pressure. The PTC is dedicated to each zone, and the flow path from the rear end of the warm air core at the start of the zone's air duct to the front end of the electric damper can be treated as a single unit. The pressure at the front end of the electric damper is used as the zone's air duct outlet pressure P. V The pressure at the end of the main pipe (evaporator outlet) can be equal to the pressure at the beginning of the manifold (heater core inlet), that is, the blower outlet pressure can be equal to the inlet pressure P of the zone duct. M Equivalent to simplify the analysis.

[0074] It should be noted that the outlet pressure of the zoned air duct needs to be able to overcome different pipe resistances, therefore, the outlet pressure of the zoned air duct is different in different blowing modes.

[0075] refer to Figure 3 As shown, when air flows within an air conditioning unit or duct, it experiences pressure loss due to the duct structure (length, bends, and cross-sectional changes). According to the turbulence theory of fluid mechanics, the pressure loss is proportional to the square of the air volume, as shown in Equation 1.

[0076] , Formula 1

[0077] in, R represents the flow pressure loss (unit: Pa), which is the pressure difference between the two ends of the duct; R is the pipe resistance coefficient (unitless), the value of which is determined by the actual structure of the duct (e.g., the longer the length, the more bends, and the higher the degree of irregularity of the cross-section, the larger R is). Air volume, unit .

[0078] Furthermore, the pressure difference between the inlet and outlet pressures of the zoned air duct The relationship is:

[0079] , Formula 2

[0080] Combining Formula 1, we can derive:

[0081] , Formula 3

[0082] The air conditioning controller has a pre-set mapping relationship between the duct resistance coefficient R and the zone air duct and blowing mode. This means that different duct resistance coefficients need to be adapted to different blowing modes for each zone air duct. For example, the duct resistance coefficient is used in the face blowing mode. When using the foot-blowing mode, the pipe resistance coefficient is used. In defogging mode, the pipe resistance coefficient is used. When using multiple air-blowing modes, the average pipe resistance coefficient of each individual mode is used as the pipe resistance coefficient for that specific mode. For example, when using the foot-blowing mode combined with the face-blowing mode, the pipe resistance coefficient used is... .

[0083] The essence of air volume is the volume of air passing through the damper per unit time. It needs to be calculated by combining the outlet area of ​​the damper (A, unit m²) and the air velocity (v, unit m / s). At the same time, the obstructed outflow (non-free outflow) caused by the damper grille in the actual scenario must also be considered.

[0084] The relationship between air volume, outlet area, and air velocity is as follows:

[0085] , Formula 4

[0086] Because the damper has a grille (partial obstruction), the airflow process from the damper is obstructed outflow. According to Bernoulli's equation (ignoring the compressibility of air), the pressure difference inside and outside the damper ( The relationship between the flow rate and the velocity v is:

[0087] , Formula 5

[0088] in, The pressure difference between the inside and outside of the damper ( Pa is the standard atmospheric pressure inside the vehicle. The local resistance coefficient is determined by the grille structure. Different air blowing modes and different damper openings correspond to different local resistance coefficients. The air conditioning controller can preset the mapping relationship between air blowing mode, damper opening and local resistance coefficient. The method of determining the local resistance coefficient in multiple air blowing modes is similar to the principle of determining the duct resistance coefficient. The unit for air density is kg / m³, which can be obtained by looking up a table based on the current temperature. For example, Table 1 illustrates the correspondence between temperature and air density according to an embodiment of the present invention.

[0089] Table 1

[0090]

[0091] The flow velocity is obtained by reverse calculation of Equation 5:

[0092] , Formula 6

[0093] Combining the aforementioned formulas, we can derive the following:

[0094] , Formula 7

[0095] , Formula 8

[0096] Based on Formula 6, it can be deduced by reverse reasoning;

[0097] , Formula 9

[0098] Based on the above reasoning, the preset mapping relationship can be obtained as shown in Formula 7-9. That is, the preset mapping relationship can characterize the correspondence between pressure, air volume and damper opening, where damper opening can be represented by air outlet area.

[0099] Optionally, the pipe resistance coefficient can be tested under standard atmospheric pressure during calibration. When testing the face blowing damper, all foot blowing dampers are closed, and all face blowing dampers are controlled and adjusted simultaneously according to the same ratio. When testing the foot blowing damper, all face blowing dampers are closed, and all foot blowing dampers are controlled and adjusted simultaneously according to the same ratio. By adjusting the blower speed, from the lowest speed to the highest speed, multiple speed levels are set. After each level runs stably for 30 seconds, data is collected: the blower speed at the current level, the blower outlet pressure, the pressure in front of the electric damper of the duct to be calibrated, and the actual air volume of the duct to be calibrated. Then, according to the aforementioned Formula 1, in each blowing mode, the pressure difference between the blower outlet pressure and the pressure in front of the electric damper of the duct to be calibrated is calculated. The actual air volume of the duct to be calibrated is then substituted into Formula 1 to deduce the correspondence between the pipe resistance coefficient R and the blowing mode.

[0100] Similarly, the local resistance coefficient can be tested under standard atmospheric pressure during calibration. When testing the face blowing damper, all foot blowing dampers are closed, and all face blowing dampers are controlled and adjusted simultaneously according to the same ratio. When testing the foot blowing damper, all face blowing dampers are closed, and all foot blowing dampers are controlled and adjusted simultaneously according to the same ratio. By adjusting the blower speed from the lowest speed to the highest speed, multiple speed levels are set. After each level runs stably for 30 seconds, data is collected: the blower speed at the current level, the pressure in front of the electric damper of the duct to be calibrated, the pressure after the electric damper of the duct to be calibrated, and the air velocity at the outlet of the electric damper of the duct to be calibrated. Combined with Formula 5, the mapping relationship between the local resistance coefficient and the opening of the electric damper under different blowing modes can be derived.

[0101] Referring to Formula 7, to achieve the same airflow, it can be achieved by either a large electric damper opening + a small zone duct inlet pressure, or a small electric damper opening + a large zone duct inlet pressure. However, the large electric damper opening + small zone duct inlet pressure method is superior, with lower power consumption and noise. The combination of a small electric damper opening + large zone duct inlet pressure may cause whistling. Therefore, the control parameters should be controlled as much as possible towards the direction of large electric damper opening + small zone duct inlet pressure. Therefore, in several zone ducts, one zone duct has an electric damper opening of 100% (this zone duct is usually the one with the highest airflow requirement). The inlet pressure of this zone duct is set according to the requirements of this electric damper. The openings of the other dampers are controlled based on the inlet pressure of this zone duct. That is, the maximum value of the inlet pressure of the zone ducts is used as the outlet pressure of the blower to meet the inlet pressure requirements of all zone ducts.

[0102] Furthermore, the relationship between the pressure difference between the inlet pressure and the outlet pressure of the blower is as follows:

[0103] , Formula 10

[0104] in, This indicates the maximum value of the inlet pressure in the zoned air duct; This indicates the pressure difference between the inlet and outlet pressures of the blower. This indicates the inlet pressure of the blower.

[0105] Furthermore, through calibration tests, data on the fan speed under different pressure differences and total air volume conditions can be obtained, and the fan characteristic curves between pressure difference, total air volume and fan speed can be obtained through data fitting.

[0106] Optionally, calibration tests can be performed under different circulation states to obtain the fan characteristic curves. That is, the characteristic curve of the first sub-fan can be obtained in the internal circulation state, the characteristic curve of the second sub-fan can be obtained in the external circulation state, and the characteristic curve of the third sub-fan can be obtained under different internal and external circulation mixing ratios. The characteristic curves of the sub-fans all represent the mapping relationship between pressure difference, total air volume and speed.

[0107] For example, under standard atmospheric pressure, the three-dimensional characteristic curves of the blower speed, pressure difference, and total air volume can be tested at 0%, 20%, 40%, 60%, 80%, and 100% external circulation. The pressure difference and total air volume are divided into 20 equal parts from minimum to maximum, and the corresponding speeds are tested to obtain the first sub-blower characteristic curve of pressure difference, total air volume, and speed in pure internal circulation mode; the second sub-blower characteristic curve of pressure difference, total air volume, and speed in pure external circulation mode at 0 vehicle speed, standard atmospheric pressure, and standard air density; and the third sub-blower characteristic curve of mixing ratio, speed, pressure difference, and total air volume when the air conditioning system is in different internal and external circulation mixing ratios.

[0108] Understandably, the preset blower characteristic curve is calibrated at 0 vehicle speed, standard atmospheric pressure, and standard air density. However, during external circulation, the blower draws in outside air. The higher the vehicle speed, the stronger the impact effect generated by the outside air flowing through the air intake grille, resulting in a higher inlet pressure of the blower and a more significant difference from the inlet pressure benchmark under the calibration conditions. Furthermore, air density is related to the inlet pressure and temperature of the blower, causing a deviation between the actual air density and the standard air density. Therefore, it is necessary to correct the pressure difference between the outlet pressure and the inlet pressure of the blower under actual operating conditions to an equivalent pressure difference that adapts to the characteristic curve of the second sub-blower. That is, a pressure difference based on the air density correction, in order to adapt to the characteristic curve of the second sub-blower.

[0109] Specifically, the actual pressure difference between the blower's outlet pressure and the blower's inlet pressure at the current vehicle speed. And, the reference pressure difference under the calibration condition (0 vehicle speed). The relationship between them can be expressed as shown in Formula 11, which can be transformed into Formula 12. Since... The pressure difference adapted to the characteristic curve of the second sub-fan can be defined as the pressure difference corrected for air density. Therefore, the pressure difference is based on the air density correction. This can be represented as shown in Formula 13. This is the pressure difference parameter that can be directly substituted into the characteristic curve of the second sub-fan. Furthermore, it is the pressure difference between the blower's outlet pressure and inlet pressure at the current vehicle speed. It can also be expressed as shown in Formula 14. Substituting it into Formula 13, we can obtain the pressure difference based on air density correction as shown in Formula 15.

[0110] , Formula 11

[0111] , Formula 12

[0112] , Formula 13

[0113] , Formula 14

[0114] , Formula 15

[0115] in, The density of air at standard atmospheric pressure (standard air density). Given the current blower inlet pressure and the air density at the current ambient temperature, the air conditioning controller can pre-store the correspondence between pressure, temperature, and air density. Therefore, based on the current blower inlet pressure and the current ambient temperature, it can determine the... .

[0116] In summary, the calibration process for the preset mapping relationship and fan characteristic curve only requires calibration of a small number of parameters. For example, the preset mapping relationship requires calibration of the pipe resistance coefficient and local resistance coefficient, and the fan characteristic curve calibration process requires testing the rotational speed, pressure difference, and total air volume under different cycle states. It eliminates the need for calibration tests under complex operating condition combinations. Compared to the multi-dimensional product-type tests of existing technologies, the preset mapping relationship and fan characteristic curve provided by this invention have fewer testing dimensions, lower testing complexity, and lower testing costs. Furthermore, this invention provides a universal derivation link based on the essential laws of fluid mechanics and fan performance, without relying on fixed operating conditions. Compared to existing technologies where all control parameters depend on pre-stored operating condition tables, this improves dynamic adaptability and thus enhances the accuracy of air volume control.

[0117] Figure 4 A flowchart of a second embodiment of the airflow control method for a vehicle air conditioning system provided by the present invention is shown. Figure 4 As shown, the method includes the following steps:

[0118] Step 210: Obtain the target airflow for each zone duct.

[0119] It should be noted that this step is similar to step 110 mentioned above, and will not be repeated here.

[0120] Step 220: For each zone air duct, determine the inlet pressure of the zone air duct according to the preset mapping relationship and the target air volume of the zone air duct.

[0121] For example, the inlet pressure of a zoned air duct refers to the airflow pressure required at the inlet of the zoned air duct. Referring to the aforementioned Formula 9, assuming that the damper opening of each zoned air duct is at its maximum, the air conditioning controller can obtain the inlet pressure of each zoned air duct by substituting the target airflow of each zoned air duct into the preset mapping relationship shown in Formula 9.

[0122] Specifically, step 220 may include the following steps:

[0123] Step 2201: Obtain the airflow mode of the zoned air duct.

[0124] For example, the blowing mode refers to the direction selection of the air supply from the partition air duct to the passenger compartment, which may include the face blowing mode (airflow blows to the passenger's face area), the foot blowing mode (airflow blows to the passenger's foot area), the defogging mode (airflow blows to the windshield), and a free combination of at least two modes. Different blowing modes correspond to different airflow paths within the partition air duct (e.g., the face blowing mode activates the face blowing damper, and the foot blowing mode activates the foot blowing damper).

[0125] Understandably, the blowing mode can be set manually or adapted automatically. For example, it can be manually selected by the user through the mode button on the air conditioning control panel, or automatically determined by the system based on sensor data such as ambient temperature and occupant position (e.g., automatically prioritizing foot blowing mode when the temperature is low).

[0126] Step 2202: Determine the damper resistance coefficient in the blowing mode, and the first air outlet area corresponding to the maximum damper opening of the zoned air duct in the blowing mode.

[0127] For example, the damper resistance coefficient refers to the duct resistance coefficient (R) and local resistance coefficient (R) generated when airflow passes through a zoned duct and an electric damper under a specific blowing mode. The system pre-sets the correspondence between the blowing mode, damper opening, duct resistance coefficient, and local resistance coefficient. The first air outlet area refers to the effective ventilation area (in m²) through which airflow can pass when the electric damper of this duct reaches 100% (fully open) in the current blowing mode. This area is an inherent design parameter of the damper and is related to the number of damper blades and the maximum opening angle of the blades. It should be noted that if the blowing mode is a combination of multiple modes, the first air outlet area can be the average of the effective ventilation areas when the electric damper opening reaches 100%.

[0128] In one example, after the air conditioning controller obtains the blowing mode of the air duct in the zone, it can call the pre-stored correspondence between the blowing mode, damper opening, duct resistance coefficient and local resistance coefficient to determine the damper resistance coefficient, which includes the duct resistance coefficient and local resistance coefficient, when the damper opening is at its maximum in the blowing mode, as well as the pre-stored first air outlet area.

[0129] It should be noted that the relationship between the damper resistance coefficient and the blowing mode can be referred to the description of the aforementioned embodiments, and will not be repeated here.

[0130] Step 2203: Determine the inlet pressure of the zone duct based on the damper resistance coefficient, the target air volume of the zone duct, the first air outlet area, and the preset mapping relationship.

[0131] The preset mapping relationship is used to characterize the correspondence between air volume, air outlet area, damper resistance coefficient and pressure.

[0132] For example, the preset mapping relationship refers to the correspondence between air volume, air outlet area, damper resistance coefficient and pressure, established based on the principle of obstructed outflow in fluid mechanics, as shown in Formula 9 above. The air conditioning controller can substitute the damper resistance coefficient, the target air volume of the duct zone, and the first air outlet area into Formula 9 to obtain the inlet pressure of the duct zone.

[0133] This method first obtains the specific airflow mode of the zoned duct, then determines the damper resistance coefficient and the first outlet area corresponding to the maximum damper opening under that specific airflow mode. Finally, by combining the target airflow of the zone with the pre-stored mapping relationship, the inlet pressure of the zoned duct is accurately calculated. This method avoids calculation deviations caused by using a general resistance coefficient or a fixed outlet area, ensures the adaptability of inlet pressure calculations under different airflow modes, and improves the accuracy and engineering practicality of inlet pressure determination.

[0134] Step 230: Take the maximum value of the inlet pressure of the partitioned air duct as the outlet pressure of the blower.

[0135] For example, the outlet pressure of the blower refers to the pressure value of the airflow output to the main duct after the blower has been pressurized. It must at least meet the inlet pressure of the duct with the largest airflow demand and the greatest resistance to avoid insufficient airflow in some ducts due to insufficient pressure. The maximum inlet pressure refers to the peak value of the inlet pressure of all ducts. Using this as the outlet pressure of the blower ensures that all ducts can obtain sufficient pressure to support the target airflow.

[0136] Step 240: Determine the second air outlet area based on the target air volume of the zoned air duct, the outlet pressure of the blower, the damper resistance coefficient, and the preset mapping relationship.

[0137] For example, the second air outlet area refers to the effective ventilation area (i.e. the area through which airflow can actually pass) that the damper needs to achieve the target air volume of the output zone duct. It is positively correlated with the damper opening degree; the larger the opening degree, the larger the second air outlet area.

[0138] In one example, the preset mapping relationship can be represented as shown in Formula 8 above. After substituting the target air volume of the partitioned air duct, the outlet pressure of the blower, and the damper resistance coefficient, the second air outlet area of ​​each partitioned air duct is obtained.

[0139] Step 250: Take the damper opening corresponding to the second air outlet area as the target damper opening of the zoned air duct.

[0140] For example, the air conditioning controller can pre-store a mapping relationship between the damper opening and the air outlet area. This mapping relationship can be generated in advance through experimental testing to ensure the matching accuracy between the area and the opening. Furthermore, the air conditioning controller can determine the target damper opening based on the current second air outlet area. It is understood that if the second air outlet area equals the maximum effective area of ​​the damper, then the opening is 100%.

[0141] Step 260: Obtain the circulation status of the air conditioning system.

[0142] For example, the air circulation state of the air conditioning system refers to the source mode of the air intake of the air conditioning system, which is divided into internal circulation, external circulation, and mixed circulation (partial internal circulation + partial external circulation). Among them, internal circulation refers to the intake of air from inside the vehicle, external circulation refers to the intake of fresh air from outside the vehicle, and mixed circulation refers to the proportional mixing of air inside and outside the vehicle. The circulation state can be obtained by the user through the "internal / external circulation" button on the air conditioning panel, or it can be dynamically switched by the air conditioning system based on the carbon dioxide concentration inside the vehicle and the air quality outside the vehicle (such as PM2.5 value).

[0143] Step 270: Determine the total air volume based on the target air volume of each zone duct.

[0144] For example, total air volume refers to the cumulative value of the target air volume of all zone air ducts in the air conditioning system, which represents the total air volume flow rate that the blower needs to output to the main air duct.

[0145] Step 280: Determine the target speed based on the blower's outlet pressure, total air volume, circulation status, and preset blower characteristic curve.

[0146] For example, as mentioned above, preset fan characteristic curves for different cycle states can be stored in advance, and then the corresponding preset fan characteristic curve can be selected based on the current cycle state of the air conditioning system to obtain a more accurate target speed.

[0147] Case 1: The circulation state is internal circulation. The preset fan characteristic curve includes the first sub-fan characteristic curve, which is used to characterize the correspondence between speed, pressure difference and air volume during internal circulation. In this implementation mode, the atmospheric pressure inside the vehicle is obtained. Based on the atmospheric pressure and the outlet pressure of the blower, the first target pressure difference is determined. Based on the total air volume, the first target pressure difference and the first sub-fan characteristic curve, the target speed is determined.

[0148] For example, during internal circulation, the blower draws in air from inside the vehicle, so the inlet pressure of the blower is atmospheric pressure. After obtaining the atmospheric pressure inside the vehicle, the pressure difference between the outlet pressure of the blower and atmospheric pressure is determined to obtain the first target pressure difference. Then, based on the characteristic curve of the first sub-blower, the rotational speed corresponding to the first target pressure difference and the total air volume can be determined to obtain the target rotational speed.

[0149] Case 2: The circulation state is external circulation state. The preset fan characteristic curve includes the second sub-fan characteristic curve. The second sub-fan characteristic curve is used to characterize the correspondence between speed, pressure difference and air volume during external circulation.

[0150] As mentioned above, since the characteristic curve of the second sub-fan is calibrated at 0 vehicle speed, standard atmospheric pressure, and standard air density, the pressure difference between the inlet and outlet pressures of the blower needs to be corrected based on the actual operating conditions of the vehicle (actual vehicle speed and actual ambient temperature) before it can be adapted to the characteristic curve of the second sub-fan.

[0151] In this implementation, step 280 may include the following steps:

[0152] Step 2801: Obtain the vehicle's current speed, the current blower inlet pressure, and the current ambient temperature.

[0153] For example, the current vehicle speed refers to the vehicle's real-time driving speed, which can be obtained from the vehicle speed sensor via the vehicle bus. The current blower inlet pressure refers to the pressure of outside air drawn into the vehicle by the blower in external circulation mode. The current ambient temperature refers to the real-time air temperature outside the vehicle, which can be collected by the outside temperature sensor. For instance, the air conditioning controller can obtain the current vehicle speed from the vehicle speed sensor, the current blower inlet pressure from the pressure sensor, and the current ambient temperature from the temperature sensor via the bus.

[0154] Step 2802: Determine the density correction factor at the blower inlet pressure and current ambient temperature.

[0155] For example, the density correction factor refers to the standard air density under actual external circulation conditions. With air density The ratio is used to correct the pressure difference between the inlet and outlet pressures of the blower.

[0156] In one example, as mentioned above, the air conditioning controller can pre-store the correspondence between pressure, temperature, and air density, and then determine the air density based on the current blower inlet pressure and the current ambient temperature. Therefore, the standard air density can be determined. With air density The ratio of is used as the density correction factor.

[0157] Step 2803: Determine the second target pressure difference based on the density correction coefficient, the inlet pressure of the blower, and the outlet pressure of the blower.

[0158] For example, the second target pressure difference refers to the pressure difference (equivalent pressure difference) based on air density correction, adapted to the actual operating conditions of the external circulation, in order to match the characteristic curve of the second sub-fan. Referring to the aforementioned Formula 15, the second target pressure difference is obtained by substituting the blower's outlet pressure, inlet pressure, and density correction coefficient.

[0159] Step 2804: Determine the target speed based on the total air volume, the second target pressure difference, and the characteristic curve of the second sub-fan.

[0160] For example, based on the characteristic curve of the second sub-fan, the rotational speed corresponding to the total air volume and the second target pressure difference can be used as the target rotational speed.

[0161] This method first obtains the current vehicle speed, blower inlet pressure, and ambient temperature that affect the external circulation operation. Then, it calculates the density correction coefficient based on these parameters. Next, it uses the density correction coefficient and the blower inlet and outlet pressures to determine the second target pressure difference that matches the characteristic curve of the second sub-fan. Finally, it combines the total system air volume with the characteristic curve of the second sub-fan specific to external circulation to obtain the target speed through data matching. This method can fully consider the changes in intake pressure caused by vehicle speed and the changes in air density caused by ambient temperature during external circulation. By calculating the density correction coefficient and the equivalent pressure difference, it solves the problem that traditional fixed parameters cannot adapt to dynamic external circulation conditions. Furthermore, by combining real-time parameter acquisition with dynamic correction, it achieves accurate and rapid determination of the blower speed under external circulation conditions, ensuring stable output of air volume in each zone under different vehicle speeds and ambient temperatures, and improving the dynamic adaptability of the air conditioning system and the user experience.

[0162] Scenario 3: The circulation state is a mixed circulation state. One possible implementation is as mentioned above, where the preset fan characteristic curve can also include a third sub-fan characteristic curve. This curve characterizes the relationship between speed, pressure difference, and total air volume under different mixed circulation ratios. After determining the pressure difference between the blower's outlet pressure and atmospheric pressure, and the total air volume, and obtaining the mixed circulation ratio of the air conditioning system, the speed corresponding to the mixed circulation ratio, pressure difference, and total air volume is used as the target speed based on the third sub-fan characteristic curve. By calling the pre-calibrated mapping relationship, no complex real-time calculations are required, resulting in a fast response time.

[0163] Another possible implementation involves obtaining the mixing cycle ratio of the air conditioning system. Based on the blower's outlet pressure, total air volume, and a preset blower characteristic curve, the blower speed during internal circulation and external circulation is determined. Specifically, this involves determining the blower speed during pure internal circulation and pure external circulation using the aforementioned implementation method. Based on the mixing cycle ratio, the blower speeds during internal and external circulation are weighted and summed to obtain the target speed. This method eliminates the need for additional calibration tests on a large number of mixing ratios. By reusing the calculation methods for internal and external circulation speeds, it reduces bench testing workload and system storage pressure during the development phase (eliminating the need to store massive amounts of mixing ratio calibration data). Furthermore, it adapts to subsequent dynamic updates of the mixing ratio without requiring recalibration tests.

[0164] Step 290: Control the blower and damper according to the target speed and target damper opening to ensure that the zoned air duct outputs the target air volume.

[0165] It should be noted that this step is similar to step 140 mentioned above, and will not be repeated here.

[0166] In this embodiment, the air conditioning controller first obtains the target air volume for each zone's air duct, then calculates the inlet pressure of each zone's air duct using a preset mapping relationship, and takes the maximum value as the blower's outlet pressure. Next, it calculates the second air outlet area by combining the target air volume of the zone's air duct, the blower's outlet pressure, and the damper resistance coefficient, and then queries the target damper opening for that zone's air duct. Subsequently, it obtains the air conditioning system's circulation status, accumulates the target air volume to obtain the total air volume, and obtains the blower's target speed through a preset blower characteristic curve. Finally, it controls the blower and electric damper based on the target speed and target damper opening to ensure that the zone's air duct outputs the target air volume. By using this method, and replacing the full-condition test parameter table with a preset mapping relationship, it can quickly adapt to dynamic changes in real vehicle use, improving control flexibility and accuracy.

[0167] Figure 5 A schematic diagram of an embodiment of the airflow control device for a vehicle air conditioning system provided by the present invention is shown. Figure 5 As shown, the air volume control device 300 of the vehicle air conditioning system includes: an acquisition module 310, a first determination module 320, a second determination module 330, and a control module 340.

[0168] The acquisition module 310 is used to acquire the target air volume for each zone air duct;

[0169] The first determining module 320 is used to determine the outlet pressure of the blower and the target damper opening of each zone duct according to the preset mapping relationship and the target air volume of the zone duct; wherein, the preset mapping relationship is used to characterize the correspondence between pressure, air volume and damper opening.

[0170] The second determining module 330 is used to determine the target speed of the blower based on the outlet pressure of the blower, the target air volume of each zone duct, and the preset blower characteristic curve; wherein, the preset blower characteristic curve is used to characterize the correspondence between the speed, pressure difference and total air volume.

[0171] The control module 340 is used to control the blower and damper according to the target speed and the target damper opening, so that the zoned air duct outputs the target air volume.

[0172] In one alternative approach, the first determining module 320 is configured to:

[0173] For each zone air duct, the inlet pressure of that zone air duct is determined according to the preset mapping relationship and the target air volume of that zone air duct;

[0174] The maximum value of the inlet pressure of the zoned air duct is used as the outlet pressure of the blower.

[0175] In one alternative approach, the first determining module 320 is configured to:

[0176] Obtain the airflow pattern of the zoned air duct;

[0177] Determine the damper resistance coefficient in the blowing mode, and the first air outlet area corresponding to the maximum damper opening of the zoned air duct in the blowing mode.

[0178] The inlet pressure of the zone duct is determined based on the damper resistance coefficient, the target air volume of the zone duct, the first air outlet area, and the preset mapping relationship. The preset mapping relationship is used to characterize the correspondence between air volume, air outlet area, damper resistance coefficient, and pressure.

[0179] In one alternative approach, the first determining module 320 is configured to:

[0180] The second air outlet area is determined based on the target air volume of the zoned air duct, the outlet pressure of the blower, the damper resistance coefficient, and the preset mapping relationship.

[0181] The damper opening corresponding to the second air outlet area is used as the target damper opening for the zoned air duct.

[0182] In one alternative embodiment, the second determining module 330 is configured to:

[0183] Obtain the circulation status of the air conditioning system;

[0184] Determine the total air volume based on the target air volume of each zone air duct;

[0185] The target speed is determined based on the blower's outlet pressure, total air volume, circulation status, and the preset blower characteristic curve.

[0186] In one optional mode, the circulation state is an internal circulation state, and the preset fan characteristic curve includes a first sub-fan characteristic curve, which is used to characterize the correspondence between speed, pressure difference and air volume during internal circulation; the second determining module 330 is used for:

[0187] Obtain the atmospheric pressure inside the vehicle;

[0188] The first target pressure difference is determined based on atmospheric pressure and the blower's outlet pressure.

[0189] The target rotational speed is determined based on the total air volume, the first target pressure difference, and the characteristic curve of the first sub-fan.

[0190] In one optional mode, the circulation state is an external circulation state, and the preset fan characteristic curve includes a second sub-fan characteristic curve, which is used to characterize the correspondence between speed, pressure difference, and air volume during external circulation; the second determining module 330 is used for:

[0191] Obtain the vehicle's current speed, the current blower inlet pressure, and the current ambient temperature;

[0192] Determine the density correction factor at the blower inlet pressure and current ambient temperature;

[0193] The second target pressure difference is determined based on the density correction factor, the inlet pressure of the blower, and the outlet pressure of the blower.

[0194] The target rotational speed is determined based on the total air volume, the second target pressure difference, and the characteristic curve of the second sub-fan.

[0195] In one alternative approach, the loop state is a mixed loop state, and the second determining module 330 is used for:

[0196] Obtain the mixed circulation ratio of the air conditioning system;

[0197] Based on the blower's outlet pressure, total air volume, and preset blower characteristic curve, determine the blower speed during internal circulation and the blower speed during external circulation.

[0198] Based on the mixing ratio, the blower speed during internal circulation and the blower speed during external circulation are weighted and summed to obtain the target speed.

[0199] As can be seen from the above, the air volume control device for the vehicle air conditioning system provided in this embodiment of the invention can determine the blower speed and damper opening based on a preset mapping relationship and a universal principle mapping such as the blower characteristic curve, rather than based on a parameter set under fixed operating conditions. In this way, no matter what zone air volume the user sets or what dynamic operating conditions (such as any vehicle speed or any ambient temperature) are under, accurate parameters can be obtained through principle derivation. There is no problem of operating conditions not being covered, avoiding the disconnect between control parameters and user needs, and improving the accuracy of zone air volume control.

[0200] Figure 6 The diagram shows a structural schematic of an embodiment of the electronic device provided by the present invention. The specific embodiments of the present invention do not limit the specific implementation of the electronic device.

[0201] like Figure 6 As shown, the electronic device may include: a processor 402, a communications interface 404, a memory 406, and a communications bus 408.

[0202] The processor 402, communication interface 404, and memory 406 communicate with each other via communication bus 408. Communication interface 404 is used to communicate with other network elements such as clients or other servers. The processor 402 executes program 410, specifically performing the relevant steps in the above-described embodiment of the airflow control method for a vehicle air conditioning system. This electronic device can be the aforementioned air conditioning controller.

[0203] Specifically, program 410 may include program code, which includes computer-executable instructions.

[0204] Processor 402 may be a central processing unit (CPU), an application-specific integrated circuit (ASIC), or one or more integrated circuits configured to implement embodiments of the present invention. The electronic device includes one or more processors, which may be processors of the same type, such as one or more CPUs; or processors of different types, such as one or more CPUs and one or more ASICs.

[0205] Memory 406 is used to store program 410. Memory 406 may include high-speed RAM memory, and may also include non-volatile memory, such as at least one disk storage device.

[0206] Specifically, program 410 can be called by processor 402 to cause the electronic device to perform the following operations:

[0207] Obtain the target airflow for each zone's air duct;

[0208] Based on the preset mapping relationship and the target air volume of the zoned air duct, the outlet pressure of the blower and the target damper opening of each zoned air duct are determined; wherein, the preset mapping relationship is used to characterize the correspondence between pressure, air volume and damper opening.

[0209] The target speed of the blower is determined based on the outlet pressure of the blower, the target air volume of each zone duct, and the preset blower characteristic curve; wherein, the preset blower characteristic curve is used to characterize the correspondence between speed, pressure difference and total air volume.

[0210] The blower and damper are controlled according to the target speed and target damper opening to ensure that the zoned air duct outputs the target air volume.

[0211] In one alternative approach, the blower outlet pressure is determined based on a preset mapping relationship and the target airflow of the zoned duct, including:

[0212] For each zone air duct, the inlet pressure of that zone air duct is determined according to the preset mapping relationship and the target air volume of that zone air duct;

[0213] The maximum value of the inlet pressure of the zoned air duct is used as the outlet pressure of the blower.

[0214] In one optional approach, the inlet pressure of the duct section is determined based on a preset mapping relationship and the target airflow of the duct section, including:

[0215] Obtain the airflow pattern of the zoned air duct;

[0216] Determine the damper resistance coefficient in the blowing mode, and the first air outlet area corresponding to the maximum damper opening of the zoned air duct in the blowing mode.

[0217] The inlet pressure of the zone duct is determined based on the damper resistance coefficient, the target air volume of the zone duct, the first air outlet area, and the preset mapping relationship. The preset mapping relationship is used to characterize the correspondence between air volume, air outlet area, damper resistance coefficient, and pressure.

[0218] In one alternative approach, the target damper opening for each zone duct is determined, including:

[0219] The second air outlet area is determined based on the target air volume of the zoned air duct, the outlet pressure of the blower, the damper resistance coefficient, and the preset mapping relationship.

[0220] The damper opening corresponding to the second air outlet area is used as the target damper opening for the zoned air duct.

[0221] In one alternative approach, the target speed of the blower is determined based on the blower's outlet pressure, the target airflow of each zone's duct, and a preset blower characteristic curve, including:

[0222] Obtain the circulation status of the air conditioning system;

[0223] Determine the total air volume based on the target air volume of each zone air duct;

[0224] The target speed is determined based on the blower's outlet pressure, total air volume, circulation status, and the preset blower characteristic curve.

[0225] In one optional approach, the circulation state is an internal circulation state. The preset fan characteristic curves include a first sub-fan characteristic curve, which characterizes the relationship between speed, pressure difference, and air volume during internal circulation. Based on the blower's outlet pressure, total air volume, circulation state, and the preset fan characteristic curves, the target speed is determined, including:

[0226] Obtain the atmospheric pressure inside the vehicle;

[0227] The first target pressure difference is determined based on atmospheric pressure and the blower's outlet pressure.

[0228] The target rotational speed is determined based on the total air volume, the first target pressure difference, and the characteristic curve of the first sub-fan.

[0229] In one optional approach, the circulation state is an external circulation state, and the preset fan characteristic curve includes a second sub-fan characteristic curve. The second sub-fan characteristic curve is used to characterize the correspondence between speed, pressure difference, and air volume during external circulation. Based on the blower's outlet pressure, total air volume, circulation state, and the preset fan characteristic curve, the target speed is determined, including:

[0230] Obtain the vehicle's current speed, the current blower inlet pressure, and the current ambient temperature;

[0231] Determine the density correction factor at the blower inlet pressure and current ambient temperature;

[0232] The second target pressure difference is determined based on the density correction factor, the inlet pressure of the blower, and the outlet pressure of the blower.

[0233] The target rotational speed is determined based on the total air volume, the second target pressure difference, and the characteristic curve of the second sub-fan.

[0234] In one optional approach, the circulation state is a mixed circulation state. The target speed is determined based on the blower's outlet pressure, total air volume, circulation state, and a preset blower characteristic curve, including:

[0235] Obtain the mixed circulation ratio of the air conditioning system;

[0236] Based on the blower's outlet pressure, total air volume, and preset blower characteristic curve, determine the blower speed during internal circulation and the blower speed during external circulation.

[0237] Based on the mixing ratio, the blower speed during internal circulation and the blower speed during external circulation are weighted and summed to obtain the target speed.

[0238] As can be seen from the above, the electronic device provided in the embodiments of the present invention can determine the blower speed and damper opening based on a preset mapping relationship and a universal principle mapping such as the fan characteristic curve, rather than based on a parameter set under fixed working conditions. In this way, no matter what kind of zone air volume the user sets or what kind of dynamic working conditions (such as any vehicle speed or any ambient temperature), accurate parameters can be obtained through principle derivation. There is no problem of working conditions not being covered, avoiding the disconnect between control parameters and user needs, and improving the accuracy of zone air volume control.

[0239] This invention provides a vehicle including a controller and an air conditioning system. The air conditioning system includes a blower and multiple zone air ducts, each zone air duct including at least one damper. The controller can be used to perform the following operations:

[0240] Obtain the target airflow for each zone's air duct;

[0241] Based on the preset mapping relationship and the target air volume of the zoned air duct, the outlet pressure of the blower and the target damper opening of each zoned air duct are determined; wherein, the preset mapping relationship is used to characterize the correspondence between pressure, air volume and damper opening.

[0242] The target speed of the blower is determined based on the outlet pressure of the blower, the target air volume of each zone duct, and the preset blower characteristic curve; wherein, the preset blower characteristic curve is used to characterize the correspondence between speed, pressure difference and total air volume.

[0243] The blower and damper are controlled according to the target speed and target damper opening to ensure that the zoned air duct outputs the target air volume.

[0244] In one alternative approach, the blower outlet pressure is determined based on a preset mapping relationship and the target airflow of the zoned duct, including:

[0245] For each zone air duct, the inlet pressure of that zone air duct is determined according to the preset mapping relationship and the target air volume of that zone air duct;

[0246] The maximum value of the inlet pressure of the zoned air duct is used as the outlet pressure of the blower.

[0247] In one optional approach, the inlet pressure of the duct section is determined based on a preset mapping relationship and the target airflow of the duct section, including:

[0248] Obtain the airflow pattern of the zoned air duct;

[0249] Determine the damper resistance coefficient in the blowing mode, and the first air outlet area corresponding to the maximum damper opening of the zoned air duct in the blowing mode.

[0250] The inlet pressure of the zone duct is determined based on the damper resistance coefficient, the target air volume of the zone duct, the first air outlet area, and the preset mapping relationship. The preset mapping relationship is used to characterize the correspondence between air volume, air outlet area, damper resistance coefficient, and pressure.

[0251] In one alternative approach, the target damper opening for each zone duct is determined, including:

[0252] The second air outlet area is determined based on the target air volume of the zoned air duct, the outlet pressure of the blower, the damper resistance coefficient, and the preset mapping relationship.

[0253] The damper opening corresponding to the second air outlet area is used as the target damper opening for the zoned air duct.

[0254] In one alternative approach, the target speed of the blower is determined based on the blower's outlet pressure, the target airflow of each zone's duct, and a preset blower characteristic curve, including:

[0255] Obtain the circulation status of the air conditioning system;

[0256] Determine the total air volume based on the target air volume of each zone air duct;

[0257] The target speed is determined based on the blower's outlet pressure, total air volume, circulation status, and the preset blower characteristic curve.

[0258] In one optional approach, the circulation state is an internal circulation state. The preset fan characteristic curves include a first sub-fan characteristic curve, which characterizes the relationship between speed, pressure difference, and air volume during internal circulation. Based on the blower's outlet pressure, total air volume, circulation state, and the preset fan characteristic curves, the target speed is determined, including:

[0259] Obtain the atmospheric pressure inside the vehicle;

[0260] The first target pressure difference is determined based on atmospheric pressure and the blower's outlet pressure.

[0261] The target rotational speed is determined based on the total air volume, the first target pressure difference, and the characteristic curve of the first sub-fan.

[0262] In one optional approach, the circulation state is an external circulation state, and the preset fan characteristic curve includes a second sub-fan characteristic curve. The second sub-fan characteristic curve is used to characterize the correspondence between speed, pressure difference, and air volume during external circulation. Based on the blower's outlet pressure, total air volume, circulation state, and the preset fan characteristic curve, the target speed is determined, including:

[0263] Obtain the vehicle's current speed, the current blower inlet pressure, and the current ambient temperature;

[0264] Determine the density correction factor at the blower inlet pressure and current ambient temperature;

[0265] The second target pressure difference is determined based on the density correction factor, the inlet pressure of the blower, and the outlet pressure of the blower.

[0266] The target rotational speed is determined based on the total air volume, the second target pressure difference, and the characteristic curve of the second sub-fan.

[0267] In one optional approach, the circulation state is a mixed circulation state. The target speed is determined based on the blower's outlet pressure, total air volume, circulation state, and a preset blower characteristic curve, including:

[0268] Obtain the mixed circulation ratio of the air conditioning system;

[0269] Based on the blower's outlet pressure, total air volume, and preset blower characteristic curve, determine the blower speed during internal circulation and the blower speed during external circulation.

[0270] Based on the mixing ratio, the blower speed during internal circulation and the blower speed during external circulation are weighted and summed to obtain the target speed.

[0271] As can be seen from the above, the controller provided by the embodiments of the present invention can determine the blower speed and damper opening based on a preset mapping relationship and a universal principle mapping such as the fan characteristic curve, rather than based on a parameter set under fixed operating conditions. In this way, no matter what kind of zone air volume the user sets or what kind of dynamic operating conditions (such as any vehicle speed or any ambient temperature), accurate parameters can be obtained through principle derivation. There is no problem of operating conditions not being covered, avoiding the disconnect between control parameters and user needs, and improving the accuracy of zone air volume control.

[0272] This invention provides a computer-readable storage medium storing at least one executable instruction. When the executable instruction is executed on an airflow control device of an electronic device / vehicle air conditioning system, it causes the airflow control device of the electronic device / vehicle air conditioning system to perform the airflow control method of the vehicle air conditioning system in any of the above method embodiments.

[0273] Specifically, the executable instructions can be used to cause the airflow control device of an electronic device / vehicle air conditioning system to perform the following operations:

[0274] Obtain the target airflow for each zone's air duct;

[0275] Based on the preset mapping relationship and the target air volume of the zoned air duct, the outlet pressure of the blower and the target damper opening of each zoned air duct are determined; wherein, the preset mapping relationship is used to characterize the correspondence between pressure, air volume and damper opening.

[0276] The target speed of the blower is determined based on the outlet pressure of the blower, the target air volume of each zone duct, and the preset blower characteristic curve; wherein, the preset blower characteristic curve is used to characterize the correspondence between speed, pressure difference and total air volume.

[0277] The blower and damper are controlled according to the target speed and target damper opening to ensure that the zoned air duct outputs the target air volume.

[0278] In one alternative approach, the blower outlet pressure is determined based on a preset mapping relationship and the target airflow of the zoned duct, including:

[0279] For each zone air duct, the inlet pressure of that zone air duct is determined according to the preset mapping relationship and the target air volume of that zone air duct;

[0280] The maximum value of the inlet pressure of the zoned air duct is used as the outlet pressure of the blower.

[0281] In one optional approach, the inlet pressure of the duct section is determined based on a preset mapping relationship and the target airflow of the duct section, including:

[0282] Obtain the airflow pattern of the zoned air duct;

[0283] Determine the damper resistance coefficient in the blowing mode, and the first air outlet area corresponding to the maximum damper opening of the zoned air duct in the blowing mode.

[0284] The inlet pressure of the zone duct is determined based on the damper resistance coefficient, the target air volume of the zone duct, the first air outlet area, and the preset mapping relationship. The preset mapping relationship is used to characterize the correspondence between air volume, air outlet area, damper resistance coefficient, and pressure.

[0285] In one alternative approach, the target damper opening for each zone duct is determined, including:

[0286] The second air outlet area is determined based on the target air volume of the zoned air duct, the outlet pressure of the blower, the damper resistance coefficient, and the preset mapping relationship.

[0287] The damper opening corresponding to the second air outlet area is used as the target damper opening for the zoned air duct.

[0288] In one alternative approach, the target speed of the blower is determined based on the blower's outlet pressure, the target airflow of each zone's duct, and a preset blower characteristic curve, including:

[0289] Obtain the circulation status of the air conditioning system;

[0290] Determine the total air volume based on the target air volume of each zone air duct;

[0291] The target speed is determined based on the blower's outlet pressure, total air volume, circulation status, and the preset blower characteristic curve.

[0292] In one optional approach, the circulation state is an internal circulation state. The preset fan characteristic curves include a first sub-fan characteristic curve, which characterizes the relationship between speed, pressure difference, and air volume during internal circulation. Based on the blower's outlet pressure, total air volume, circulation state, and the preset fan characteristic curves, the target speed is determined, including:

[0293] Obtain the atmospheric pressure inside the vehicle;

[0294] The first target pressure difference is determined based on atmospheric pressure and the blower's outlet pressure.

[0295] The target rotational speed is determined based on the total air volume, the first target pressure difference, and the characteristic curve of the first sub-fan.

[0296] In one optional approach, the circulation state is an external circulation state, and the preset fan characteristic curve includes a second sub-fan characteristic curve. The second sub-fan characteristic curve is used to characterize the correspondence between speed, pressure difference, and air volume during external circulation. Based on the blower's outlet pressure, total air volume, circulation state, and the preset fan characteristic curve, the target speed is determined, including:

[0297] Obtain the vehicle's current speed, the current blower inlet pressure, and the current ambient temperature;

[0298] Determine the density correction factor at the blower inlet pressure and current ambient temperature;

[0299] The second target pressure difference is determined based on the density correction factor, the inlet pressure of the blower, and the outlet pressure of the blower.

[0300] The target rotational speed is determined based on the total air volume, the second target pressure difference, and the characteristic curve of the second sub-fan.

[0301] In one optional approach, the circulation state is a mixed circulation state. The target speed is determined based on the blower's outlet pressure, total air volume, circulation state, and a preset blower characteristic curve, including:

[0302] Obtain the mixed circulation ratio of the air conditioning system;

[0303] Based on the blower's outlet pressure, total air volume, and preset blower characteristic curve, determine the blower speed during internal circulation and the blower speed during external circulation.

[0304] Based on the mixing ratio, the blower speed during internal circulation and the blower speed during external circulation are weighted and summed to obtain the target speed.

[0305] As can be seen from the above, the computer-readable storage medium provided in the embodiments of the present invention stores at least one executable instruction. When the executable instruction runs on the air volume control device of the electronic device / vehicle air conditioning system, it can determine the blower speed and damper opening based on the universal principle mapping such as the preset mapping relationship and the fan characteristic curve, rather than based on the parameter set under fixed working conditions. In this way, no matter what kind of zone air volume the user sets or what kind of dynamic working conditions (such as any vehicle speed or any ambient temperature), accurate parameters can be obtained through principle derivation. There is no problem of incomplete working conditions, avoiding the disconnect between control parameters and user needs, and improving the accuracy of zone air volume control.

[0306] The algorithms or displays provided herein are not inherently related to any particular computer, virtual system, or other device. Furthermore, the embodiments of this invention are not directed to any particular programming language.

[0307] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of the invention may be practiced without these specific details. Similarly, for the sake of brevity and to aid in understanding one or more aspects of the invention, in the description of exemplary embodiments of the invention above, various features of the embodiments are sometimes grouped together in a single embodiment, figure, or description thereof. The claims, which follow the detailed description, are hereby expressly incorporated into that detailed description, wherein each claim itself is a separate embodiment of the invention.

[0308] Those skilled in the art will understand that the modules in the device of the embodiment can be adaptively changed and placed in one or more devices different from that embodiment. Modules, units, or components in the embodiment can be combined into a single module, unit, or component, and further, they can be divided into multiple sub-modules, sub-units, or sub-components, except that at least some of such features and / or processes or units are mutually exclusive.

[0309] It should be noted that the above embodiments are illustrative of the invention and not restrictive, and that those skilled in the art can devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses should not be construed as limiting the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention can be implemented by means of hardware comprising several different elements and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third, etc., does not indicate any order. These words can be interpreted as names. The steps in the above embodiments, unless otherwise specified, should not be construed as limiting the order of execution.

Claims

1. A method for controlling the air volume of a vehicle air conditioning system, characterized in that, The air conditioning system includes a blower and multiple zoned air ducts, each of the zoned air ducts including at least one damper, and the method includes: Obtain the target airflow for each of the aforementioned partition ducts; Based on the preset mapping relationship and the target air volume of the partitioned air duct, the outlet pressure of the blower and the target damper opening of each partitioned air duct are determined; wherein, the preset mapping relationship is used to characterize the correspondence between pressure, air volume and damper opening. The target speed of the blower is determined based on the outlet pressure of the blower, the target air volume of each zone air duct, and the preset blower characteristic curve; wherein, the preset blower characteristic curve is used to characterize the correspondence between the speed, pressure difference, and total air volume. The blower and the damper are controlled according to the target rotation speed and the target damper opening so that the zoned air duct outputs the target air volume.

2. The method according to claim 1, characterized in that, The step of determining the outlet pressure of the blower based on a preset mapping relationship and the target air volume of the partitioned air duct includes: For each zone air duct, the inlet pressure of that zone air duct is determined according to the preset mapping relationship and the target air volume of that zone air duct; The maximum value of the inlet pressure of the partitioned air duct is taken as the outlet pressure of the blower.

3. The method according to claim 2, characterized in that, The step of determining the inlet pressure of the duct section based on the preset mapping relationship and the target airflow of the duct section includes: Obtain the airflow pattern of the partitioned air duct; Determine the damper resistance coefficient in the blowing mode, and the first air outlet area corresponding to the maximum damper opening of the partitioned air duct in the blowing mode; The inlet pressure of the partitioned air duct is determined based on the damper resistance coefficient, the target air volume of the partitioned air duct, the first air outlet area, and the preset mapping relationship; wherein, the preset mapping relationship is used to characterize the correspondence between air volume, air outlet area, damper resistance coefficient, and pressure.

4. The method according to claim 3, characterized in that, Determining the target damper opening for each of the aforementioned zone ducts includes: The second air outlet area is determined based on the target air volume of the partitioned air duct, the outlet pressure of the blower, the damper resistance coefficient, and the preset mapping relationship. The damper opening corresponding to the second air outlet area is taken as the target damper opening of the partitioned air duct.

5. The method according to any one of claims 1-4, characterized in that, The step of determining the target speed of the blower based on the outlet pressure of the blower, the target air volume of each zone duct, and a preset blower characteristic curve includes: Obtain the circulation status of the air conditioning system; The total air volume is determined based on the target air volume of each of the aforementioned zone air ducts; The target rotational speed is determined based on the blower's outlet pressure, total air volume, circulation state, and the preset blower characteristic curve.

6. The method according to claim 5, characterized in that, The circulation state is an internal circulation state, and the preset fan characteristic curve includes a first sub-fan characteristic curve, which is used to characterize the correspondence between speed, pressure difference and air volume during internal circulation. Determining the target rotational speed based on the blower's outlet pressure, total air volume, circulation state, and the preset blower characteristic curve includes: Obtain the atmospheric pressure inside the vehicle; Based on the atmospheric pressure and the outlet pressure of the blower, a first target pressure difference is determined; The target rotational speed is determined based on the total air volume, the first target pressure difference, and the characteristic curve of the first sub-fan.

7. The method according to claim 6, characterized in that, The circulation state is the external circulation state, and the preset fan characteristic curve includes a second sub-fan characteristic curve. The second sub-fan characteristic curve is used to characterize the correspondence between speed, pressure difference and air volume during external circulation. Determining the target rotational speed based on the blower's outlet pressure, total air volume, circulation state, and the preset blower characteristic curve includes: Obtain the vehicle's current speed, the current blower inlet pressure, and the current ambient temperature; Determine the density correction factor at the inlet pressure of the blower and the current ambient temperature; The second target pressure difference is determined based on the density correction coefficient, the inlet pressure of the blower, and the outlet pressure of the blower. The target rotational speed is determined based on the total air volume, the second target pressure difference, and the characteristic curve of the second sub-fan.

8. The method according to claim 7, characterized in that, The circulation state is a mixed circulation state. Determining the target rotational speed based on the blower's outlet pressure, the total air volume, the circulation state, and the preset blower characteristic curve includes: Obtain the mixing cycle ratio of the air conditioning system; Based on the blower's outlet pressure, total air volume, and preset blower characteristic curve, determine the blower's rotational speed during internal circulation and the blower's rotational speed during external circulation. Based on the mixing ratio, the speed of the blower during the internal circulation and the speed of the blower during the external circulation are weighted and summed to obtain the target speed.

9. A vehicle air conditioning system air volume control device, characterized in that, The air conditioning system includes a blower and multiple zoned air ducts, each of the zoned air ducts including at least one damper, and the device includes: The acquisition module is used to acquire the target air volume for each of the partitioned air ducts; The first determining module is used to determine the outlet pressure of the blower and the target damper opening of each partition duct according to a preset mapping relationship and the target air volume of the partition duct; wherein, the preset mapping relationship is used to characterize the correspondence between pressure, air volume and damper opening. The second determining module is used to determine the target speed of the blower based on the outlet pressure of the blower, the target air volume of each of the partitioned air ducts, and a preset blower characteristic curve; wherein, the preset blower characteristic curve is used to characterize the correspondence between the speed, pressure difference, and total air volume. The control module is used to control the blower and the damper according to the target rotation speed and the target damper opening, so that the zoned air duct outputs the target air volume.

10. A vehicle, characterized in that, The vehicle includes an air conditioning system and a controller. The air conditioning system includes a blower and multiple zone air ducts, each of the zone air ducts including at least one damper. The controller is used to perform the operation of the air volume control method for the vehicle air conditioning system as described in any one of claims 1-8.

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