Control methods and devices for vehicle air conditioning systems, vehicles

Abstract

This application discloses a control method and device for a vehicle air conditioning system, and a vehicle. The control method includes: with the air valve fully open, calculating the rear static pressure corresponding to satisfying the required air volume of each zone air duct based on the required air volume and air duct resistance coefficient of each zone air duct, to obtain multiple rear static pressures; selecting a target zone air duct from the multiple zone air ducts, wherein the target zone air duct is the zone air duct corresponding to the maximum rear static pressure among the multiple rear static pressures; adjusting the fan speed according to the required air volume of the target zone air duct, so that the air volume at the outlet end of the target zone air duct reaches the required air volume of the target zone air duct; adjusting the air valve opening of other zone air ducts according to the required air volume of other zone air ducts, so that the air volume at the outlet end of other zone air ducts reaches the required air volume of other zone air ducts; wherein, the other zone air ducts are the zone air ducts other than the target zone air duct among the multiple zone air ducts.

Description

Technical Field

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

[0002] As an important component of vehicles, vehicle air conditioning enhances the comfort of passengers. With the development of technology, people's demands for vehicle air conditioning are becoming more refined.

[0003] Current vehicle air conditioning systems can achieve temperature control in multiple zones (such as the driver's cab area, the passenger's area, etc.), but how to achieve airflow control in multiple zones is a technical problem that urgently needs to be solved. Summary of the Invention

[0004] This application provides a control method and apparatus for a vehicle air conditioning system, as well as a vehicle. The various aspects involved in this application embodiment are described below.

[0005] In a first aspect, a control method for a vehicle air conditioning system is provided. The vehicle air conditioning system includes a fan and air ducts. The fan is used to deliver airflow to the air ducts. The air ducts include multiple zone air ducts, and each zone air duct is equipped with an air valve at its outlet. The control method includes: when the air valve is fully open, calculating the post-static pressure corresponding to satisfying the required airflow of each zone air duct based on the required airflow and air duct resistance coefficient of each zone air duct, to obtain multiple post-static pressures; and selecting a target zone air duct from the multiple zone air ducts. The target zone air duct is the zone air duct corresponding to the maximum rear static pressure among the plurality of rear static pressures; the fan speed is adjusted according to the required air volume of the target zone air duct so that the air volume at the outlet end of the target zone air duct reaches the required air volume of the target zone air duct; the air valve opening of the other zone air ducts is adjusted according to the required air volume of the other zone air ducts so that the air volume at the outlet end of the other zone air ducts reaches the required air volume of the other zone air ducts; wherein, the other zone air ducts are the zone air ducts other than the target zone air duct among the plurality of zone air ducts.

[0006] As one possible implementation, after adjusting the speed of the fan, the control method further includes: determining the total air volume delivered by the fan based on the air pressure P value of the fan, the air flow rate Q value of the fan, and the total resistance coefficient of the duct; and determining the allocated air volume to be distributed to each zone duct based on the resistance coefficient of each zone duct.

[0007] As one possible implementation, the duct is equipped with an external circulation intake valve and an internal circulation intake valve. The external circulation intake valve controls the intake volume of the external circulation, and the internal circulation intake valve controls the intake volume of the internal circulation. Determining the total air volume delivered by the fan based on the fan's air pressure P-value, the fan's air flow rate Q-value, and the total resistance coefficient of the duct includes: determining the pressure rise generated by the fan based on the fan's PQ characteristic curve and the total resistance coefficient; determining the front static pressure based on the pressure rise, the resistance coefficient of the external circulation intake valve, the resistance coefficient of the internal circulation intake valve, and the intake pressure at the external circulation intake valve; and determining the total air volume based on the pressure rise, the front static pressure of the fan, and the total resistance coefficient.

[0008] As one possible implementation, after determining the front static pressure, the control method further includes: controlling the opening degree of the external circulation intake valve according to the resistance coefficient of the external circulation intake valve, the resistance coefficient of the internal circulation intake valve and the front static pressure, so that the intake pressure of the external circulation intake port is less than a preset threshold.

[0009] As one possible implementation, before obtaining multiple post-static pressures, the control method further includes: determining the required airflow of each zone's air duct based on comfort parameters of each zone in the vehicle; the comfort parameters include one or more of the following: the ambient temperature outside the zone, the airflow setting value of the zone, the set temperature of the zone, the difference between the set temperature of the zone and the current temperature of the zone, and the sunlight intensity within the zone.

[0010] As one possible implementation, adjusting the fan speed according to the required air volume of the target zone air duct includes: using a PID algorithm in a closed loop to adjust the fan speed according to the required air volume of the target zone air duct and the allocated air volume of the target zone air duct; and / or adjusting the damper opening of other zone air ducts according to the required air volume of other zone air ducts includes: using a PID algorithm in a closed loop to adjust the damper opening of other zone air ducts according to the required air volume of other zone air ducts and the allocated air volume of other zone air ducts.

[0011] As one possible implementation, the multiple zoned air ducts are four-zone air ducts.

[0012] Secondly, a control device for a vehicle air conditioning system, the vehicle air conditioning system including a fan and an air duct, the fan being used to deliver airflow to the air duct, the air duct including multiple zone air ducts, each zone air duct having an air valve at its outlet end, the control device including: a calculation module, used to calculate, when the air valve is fully open, the required airflow for each zone air duct and the air duct resistance coefficient, the corresponding back static pressure to obtain multiple back static pressures; a selection module, used to select a target zone air duct from the multiple zone air ducts, the target... The target zone air duct is the zone air duct corresponding to the maximum rear static pressure among the plurality of rear static pressures; the first adjustment module is used to adjust the speed of the fan according to the required air volume of the target zone air duct, so that the air volume at the outlet end of the target zone air duct reaches the required air volume of the target zone air duct; the second adjustment module is used to adjust the opening of the air valve of other zone air ducts according to the required air volume of other zone air ducts, so that the air volume at the outlet end of other zone air ducts reaches the required air volume of other zone air ducts; wherein, the other zone air ducts are the zone air ducts other than the target zone air duct among the plurality of zone air ducts.

[0013] Thirdly, a vehicle is provided, a memory for storing code, and a processor for executing the code stored in the memory to control the vehicle's air conditioning system to perform the method as described in the first aspect or any implementation thereof.

[0014] Fourthly, a computer program product is provided, including program code for controlling a vehicle air conditioning system to perform the method described in the first aspect or any implementation thereof.

[0015] This application provides a control method for a vehicle air conditioning system. The vehicle air conditioning system includes a fan and air ducts. The fan is used to deliver air volume to the air ducts. The air ducts include multiple zone air ducts, and each zone air duct is equipped with a damper at its outlet. The control method includes: with the dampers fully open, calculating the back static pressure corresponding to satisfying the required air volume of each zone air duct based on the required air volume and air duct resistance coefficient, to obtain multiple back static pressures; selecting a target zone air duct from the multiple zone air ducts, the target zone air duct being the zone air duct corresponding to the maximum back static pressure among the multiple back static pressures; adjusting the fan speed according to the required air volume of the target zone air duct, so that the air volume at the outlet of the target zone air duct reaches the required air volume of the target zone air duct; adjusting the damper opening of other zone air ducts according to their required air volume, so that the air volume at the outlet of other zone air ducts reaches their required air volume; wherein, the other zone air ducts are the zone air ducts other than the target zone air duct among the multiple zone air ducts. With the air valve fully open, this solution selects the air duct with the maximum static pressure as the target air duct based on the required air volume of each zone. The fan speed is controlled by the required air volume of the target air duct, while the opening of the air valve of the corresponding air duct is controlled by the required air volume of other air ducts. This allows for quick and precise control of the vehicle's air conditioning system to deliver the required air volume to multiple zones, improving the user experience. Attached Figure Description

[0016] Figure 1 This is a schematic flowchart of a vehicle air conditioning system control method provided in an embodiment of this application.

[0017] Figure 2 This is a schematic diagram of a vehicle air conditioning system provided in one embodiment of this application.

[0018] Figure 3 This is a schematic diagram of the parallel resistance coefficient network of the air duct in a vehicle air conditioning system provided in an embodiment of this application.

[0019] Figure 4 This is a schematic diagram of the parallel air volume duct network of the air duct in a vehicle air conditioning system provided in an embodiment of this application.

[0020] Figure 5 This is a schematic diagram of a vehicle air conditioning system control method provided in another embodiment of this application.

[0021] Figure 6 This is a schematic diagram of the structure of a control device for a vehicle air conditioning system provided in an embodiment of this application.

[0022] Figure 7 This is a schematic diagram of the structure of a vehicle provided in one embodiment of this application. Detailed Implementation

[0023] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0024] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this disclosure, unless otherwise stated, "a plurality of" means two or more. Furthermore, the use of "based on" or "according to" implies openness and inclusiveness, because processes, steps, calculations, or other actions "based on" or "according to" one or more conditions or values ​​may in practice be based on additional conditions or exceeding values.

[0025] As an important component of vehicles, vehicle air conditioning enhances the comfort of passengers. With the development of technology, people's demands for vehicle air conditioning are becoming more refined.

[0026] Current vehicle air conditioning systems primarily focus on temperature control, such as multi-zone temperature control (e.g., driver's cab, passenger side). However, independent airflow control has not been fully developed. Traditional vehicle air conditioning systems are often unable to flexibly meet the precise airflow needs of different passengers, especially in terms of airflow distribution and efficiency in different zones, where there is still room for improvement. Therefore, how to achieve multi-zone airflow control is a pressing technical problem that needs to be solved.

[0027] To address the aforementioned problems, this application provides a control method for a vehicle air conditioning system. The vehicle air conditioning system includes a fan and air ducts. The fan delivers airflow to the air ducts, which include multiple zone air ducts. Each zone air duct has an air valve at its outlet. The control method includes: with the air valves fully open, calculating the required static pressure for each zone air duct based on its required airflow and air duct resistance coefficient, thus obtaining multiple static pressures; selecting a target zone air duct from the multiple zone air ducts, where the target zone air duct is the zone air duct corresponding to the maximum static pressure among the multiple static pressures; adjusting the fan speed according to the required airflow of the target zone air duct, so that the airflow at the outlet of the target zone air duct reaches the required airflow of the target zone air duct; adjusting the air valve opening of other zone air ducts according to their required airflow, so that the airflow at the outlet of other zone air ducts reaches the required airflow of other zone air ducts; wherein, the other zone air ducts are the zone air ducts other than the target zone air duct among the multiple zone air ducts. With the air valve fully open, this solution selects the air duct with the maximum static pressure as the target air duct based on the required air volume of each zone. The fan speed is controlled by the required air volume of the target air duct, while the opening of the air valve of the corresponding air duct is controlled by the required air volume of other air ducts. This allows for quick and precise control of the vehicle's air conditioning system to deliver the required air volume to multiple zones, improving the user experience.

[0028] The following text combines Figure 1 The control method of the vehicle air conditioning system in the embodiments of this application is described in detail. For example... Figure 1 As shown, the control method 100 for the vehicle air conditioning system may include steps S110 to S140.

[0029] It should be noted that the vehicle air conditioning system includes a fan and air ducts. The fan is used to deliver air volume to the air ducts. The air ducts include multiple zone air ducts. Each zone air duct is equipped with an air valve at its outlet end. The air valve of each zone air duct can be used to control the air volume at the outlet end of the corresponding zone air duct.

[0030] The fan in the embodiments of this application may also refer to a ventilation fan or a blower; this application does not impose any specific limitations on this.

[0031] In this application embodiment, the vehicle air conditioning system is installed in the vehicle, which can be an electric vehicle, a fuel vehicle, or a hybrid vehicle, etc. This application does not impose any specific restrictions on this.

[0032] In this application, the vehicle may include multiple zones, each corresponding one-to-one with a zone air duct in the vehicle's air conditioning system. These multiple zones may be two, three, or four zones, etc. Correspondingly, the multiple zone air ducts may be two, three, or four zone air ducts, etc.

[0033] The aforementioned multiple partitions may include, for example, a left-side partition in a row, a right-side partition in a row, a left-side partition in a second row, and a right-side partition in a second row in a vehicle, etc. This application does not impose specific limitations on this.

[0034] In step S110, with the air valve fully open, the required air volume and air resistance coefficient of each zone air duct are used to calculate the corresponding back static pressure to satisfy the required air volume of each zone air duct, so as to obtain multiple back static pressures.

[0035] It should be noted that, in this application, the post-static pressure can refer to the static pressure after the fan. That is, the post-static pressure corresponding to the required air volume of each zone duct can refer to the static pressure after the fan corresponding to the required air volume of each zone duct.

[0036] In this application, with the air valves of each zone duct in the fully open state, the back static pressure corresponding to the required air volume of each zone duct can be calculated and determined. Furthermore, multiple back static pressures corresponding to multiple zone ducts can be obtained.

[0037] In some implementations, the vehicle where the air conditioning system is located includes multiple zones. Before obtaining multiple rear static pressures, the process also includes: determining the required air volume of each zone's air duct based on the comfort parameters of each zone in the vehicle. The comfort parameters include one or more of the following: the ambient temperature outside the zone, the air volume setting value of the zone, the set temperature of the zone, the difference between the set temperature of the zone and the current temperature of the zone, the sunlight intensity within the zone, etc. This application does not impose specific limitations on the comparison.

[0038] In some implementations, the temperature and airflow of each zone can be set through the vehicle's human-machine interface (HMI).

[0039] In some implementations, multiple zone air ducts can be converted into four zone air ducts.

[0040] In step S120, a target zone air duct is selected from multiple zone air ducts. The target zone air duct is the zone air duct corresponding to the maximum rear static pressure among multiple rear static pressures.

[0041] It should be understood that if the static pressure after the fan is maintained at the maximum value among multiple static pressures, all zone air ducts can meet their air volume requirements, and there may even be cases where some zone air ducts have excessive air volume.

[0042] As an example, if a vehicle's air conditioning system includes a first row of left-side zones (such as the driver's cabin zone) and a second row of left-side zones (such as the zone behind the driver's cabin), the required airflow for the first row of left-side zones is 100 m³ / s. 3 / h), the airflow resistance coefficient of the first row of left-side partitioned air ducts is 0.01, and the required airflow of the second row of left-side partitioned air ducts is 90 (m³ / h). 3 / h), the air duct resistance coefficient of the left side partition air duct of the second row is 0.05.

[0043] Furthermore, with the valves of each zone's air duct fully open, the static pressure P1 required after the fan to meet the demand airflow of the first row of left-side zone air ducts can be calculated based on the demand airflow and resistance coefficient, yielding P1 as 100 (Pa). Simultaneously, the static pressure P2 required after the fan to meet the demand airflow of the second row of left-side zone air ducts can be calculated based on the demand airflow and resistance coefficient, yielding P2 as 405 (Pa). If P2 is the maximum value of multiple static pressures corresponding to multiple zones, then the zone air duct corresponding to P2 can be used as the target air duct. It should be understood that, while maintaining the static pressure after the fan at P2, all zone air ducts can obtain sufficient airflow.

[0044] In step S130, the fan speed is adjusted according to the required air volume of the target zone air duct so that the air volume at the outlet end of the target zone air duct reaches the required air volume of the target zone air duct.

[0045] It should be understood that during the process of adjusting the fan speed according to the required air volume of the target zone air duct, the air valve corresponding to the target zone air duct needs to be controlled in a fully open state (i.e., the air valve is controlled at 100%).

[0046] In some implementations, the fan speed can be adjusted in a closed loop using a PID algorithm based on the required air volume of the target zone duct and the allocated air volume of the target zone duct.

[0047] In step S140, the opening of the dampers in other zone ducts is adjusted according to their required airflow, so that the airflow at the outlet of the other zone ducts reaches their required airflow. Here, "other zone ducts" refers to the zone ducts other than the target zone duct among multiple zone ducts.

[0048] In some implementations, the opening of the dampers in other air ducts can be adjusted in a closed loop using a PID algorithm based on the required air volume and the allocated air volume of other air ducts.

[0049] It should be noted that each zone air duct in the other zone air ducts is independently controlled. That is, based on the required air volume and the allocated air volume of each zone air duct in the other zone air ducts, the opening of the damper of each zone air duct can be adjusted in a closed loop using a PID algorithm to ensure that the allocated air volume meets the required air volume.

[0050] As can be seen from the above, this solution, with the air valve fully open, selects the air duct with the maximum static pressure as the target air duct based on the required air volume of each zone's air duct. The air valve of the target air duct is then fully open, and the fan speed is controlled by the required air volume of the target air duct. At the same time, the opening degree of the air valve of the corresponding air duct is controlled by the required air volume of other air ducts. This allows for quick and precise control of the vehicle's air conditioning system to deliver the required air volume to multiple zones, improving the user experience.

[0051] It should be understood that adjusting the fan speed and the opening of the dampers in other duct zones is a dynamic process that requires real-time calculation of the allocated airflow to multiple duct zones (i.e., the airflow allocated to each duct zone) to determine whether the required airflow has been achieved. Therefore, after adjusting the fan speed, it is also necessary to calculate the allocated airflow to each duct zone.

[0052] For example, after adjusting the fan speed, the total air volume delivered by the fan can be determined based on the fan's air pressure P value, fan air flow Q value, and the total resistance coefficient of the duct; and the distribution air volume to be allocated to each zone duct can be determined based on the resistance coefficient of each zone duct.

[0053] Furthermore, the duct is equipped with an external circulation intake valve and an internal circulation intake valve. The external circulation intake valve controls the intake volume of the external circulation, and the internal circulation intake valve controls the intake volume of the internal circulation. The total air volume delivered by the fan is calculated, including: determining the pressure rise generated by the fan based on the fan's PQ characteristic curve and total resistance coefficient; then, determining the front static pressure based on the pressure rise, the resistance coefficient of the external circulation intake valve, the resistance coefficient of the internal circulation intake valve, and the intake pressure at the external circulation intake valve; and further, determining the total air volume based on the pressure rise, the front static pressure of the fan, and the total resistance coefficient.

[0054] It should be noted that the PQ characteristic curve of a fan is based on the fan's P-value and Q-value. The PQ characteristic curve (also known as the performance curve) is an important tool for describing the performance relationship of a fan under different operating conditions. P represents air pressure, and Q represents air flow rate.

[0055] It should be noted that if an air filter is included before the fan, the static pressure before the fan in this application may refer to the static pressure before the filter; if an air filter is not included before the fan, the static pressure before the fan in this application may refer to the static pressure before the fan.

[0056] In some implementations, vehicle air conditioning systems typically also include an air filter, which is positioned between the air intake of the duct and the fan. The air filter filters the incoming air into the duct. Therefore, the pre-static pressure can also refer to the pre-filter static pressure.

[0057] It should be understood that during vehicle operation, outside and inside air enter the vehicle's air conditioning system through the external and internal air intakes, respectively, to regulate the cabin environment. However, when the air pressure at the external air intake is high, some outside air may bypass the air conditioning system's fan and enter the cabin through the internal air intake, potentially affecting the system's performance (e.g., causing cold air to blow onto the passenger side's feet in winter). Therefore, it is necessary to control the opening of the external air intake valve to ensure that the intake pressure (or volume) at the external air intake is below a preset threshold, thereby ensuring balanced airflow between the inside and outside of the vehicle's air conditioning system.

[0058] For example, based on the resistance coefficient of the external air intake valve, the resistance coefficient of the internal air intake valve, and the front static pressure, the opening of the external air intake valve is controlled so that the intake pressure of the external air intake port is less than a preset threshold, thereby ensuring the balanced control of the air inside and outside the air conditioning unit of the vehicle's air conditioning system.

[0059] In some implementations, if the required air volume of any zone duct changes, the static pressure corresponding to the required air volume of each zone duct can be recalculated according to the method of step S110, so as to reselect the target zone duct.

[0060] In some other implementations, if the air volume requirement of the target zone duct remains unchanged, but the air volume requirement of other zone ducts decreases, then there is no need to reselect the target zone duct; if the air volume requirement of the target zone duct remains unchanged, but the air volume requirement of other zone ducts increases, then the target zone duct needs to be reselected; if the air volume requirement of the target zone duct changes, then the target zone duct needs to be reselected.

[0061] The embodiments of this application are described in more detail below with specific examples. In the examples below, Figures 2-5 The embodiments of this application are provided merely to help those skilled in the art understand them, and are not intended to limit the embodiments of this application to the specific numerical values ​​or specific scenarios illustrated. Those skilled in the art will obviously be able to make various equivalent modifications or variations based on the examples given, and such modifications or variations also fall within the scope of the embodiments of this application.

[0062] Figure 2 This is a schematic diagram of the structure of a vehicle air conditioning system provided in an embodiment of this application, as shown below. Figure 2 As shown, a vehicle air conditioning system may include, but is not limited to: ventilation ducts, fans, evaporators, heaters, air filters (not shown in the figure), and air valves.

[0063] exist Figure 2In this diagram, f1 is the external circulation intake flow rate (also known as external circulation air volume), P1 is the intake pressure at the external circulation intake port, K1 is the resistance coefficient of the external circulation damper, K2 is the resistance coefficient of the internal circulation damper, f2 is the internal circulation intake flow rate (also known as internal circulation air volume), P2 is the static pressure before the air filter (i.e., the difference between the pressure before the air filter and atmospheric pressure) or P2 is the static pressure before the fan (i.e., the difference between the pressure before the fan and atmospheric pressure), P3 is the static pressure after the fan (i.e., the difference between the pressure after the fan and atmospheric pressure), K3 is the coefficient of total duct resistance (including duct resistance, damper resistance, evaporator resistance, and air filter resistance, etc.), f3 is the total air volume of the duct, and P... F For the pressure rise of the fan, P F =P3-P2.

[0064] It should be noted that if the air conditioning system does not have an air filter, P2 is the static pressure before the fan; if the air conditioning system has an air filter, P2 is the static pressure before the air filter.

[0065] It should be noted that, Figure 2 The damper in the duct can also be called an air valve. The air mixing damper controls the direction of air flow in the duct. When the air needs to be heated, the air mixing damper can be closed; when the air does not need to be heated, the air mixing damper can be opened.

[0066] It should be noted that, Figure 2 The text description "Atmospheric pressure = passenger compartment" means that the current marked location is the air duct outlet, and the atmospheric pressure at the air duct outlet is equal to the atmospheric pressure inside the vehicle's passenger compartment. The atmospheric pressure at the outlet of each zone's air duct is equal to the atmospheric pressure within the corresponding passenger compartment zone.

[0067] In some implementations, the relationship between the pressure difference across the ventilation duct, the duct resistance coefficient, and the air volume is as follows:

[0068] P=k·f^2 (1)

[0069] In equation (1), P is the pressure difference between the two ends of the ventilation duct, k is the resistance coefficient of the ventilation duct, and f is the air volume flowing through the ventilation duct.

[0070] In some implementations, the topological relationship of the air duct resistance coefficients of each air valve in the vehicle air conditioning system is a parallel resistance coefficient network. Figure 3 This is an example of a parallel resistance coefficient pipe network. In a parallel resistance coefficient pipe network, the resistance coefficient of each parallel duct and the total parallel resistance coefficient satisfy the following relationship:

[0071]

[0072] In equation (2), K3 is the total resistance of the parallel branch duct, k 3_1For the duct resistance of a parallel branch, k 3_2 Let K3 be the duct resistance of another parallel branch. For example, K3 is the total duct resistance, and k... 3_1 k represents the total resistance of the left-side air duct. 3_2 This represents the total resistance of the right-side air duct.

[0073] It should be understood that the duct resistance coefficients of any two parallel branches satisfy the relationship in formula (2).

[0074] In some implementations, the airflow topology of the ducts containing the various air valves in the vehicle's air conditioning system is a parallel airflow network. Figure 4 This is an example of a parallel airflow duct network. In a parallel airflow duct network, the airflow of each parallel duct and the total parallel airflow satisfy the following relationship:

[0075]

[0076] In equation (3), f3 is the total air volume of the parallel branch duct, f 3_1 For the airflow of a parallel branch, f 3_2 For the airflow of another parallel branch, k 3_1 For the duct resistance of a parallel branch, k 3_2 This represents the duct resistance of another parallel branch. For example, f3 is the total duct airflow, f... 3_1 f represents the total air volume of the left-side duct. 3_2 The total air volume of the right-side duct, k 3_1 k represents the total resistance of the left-side air duct. 3_2 This represents the total resistance of the right-side air duct.

[0077] It should be understood that the air volume of any two parallel branches satisfies the relationship in formula (3).

[0078] The preceding text mainly introduced the vehicle air conditioning system and the theoretical basis of air volume and drag coefficient. The following section introduces the control theory of the vehicle air conditioning system described in this application.

[0079] (1) Determine the required air volume for each zone's air duct. The required air volume for each zone's air duct can be determined based on one or more of the following: the ambient temperature outside the vehicle in the zone, the HMI airflow setting and set temperature of the zone, the difference between the set temperature of the zone and the interior temperature of the zone, the sunlight intensity of the zone, etc.

[0080] (2) Determine the target zone air duct. Based on the required air volume and resistance coefficient of the zone air duct where each air valve is located, calculate the static pressure P3 (also referred to as the back static pressure) required by the fan after each air valve to meet the required air volume of each zone air duct when each air valve is fully open. Obtain multiple P3 values ​​corresponding to multiple zone air ducts. Select the largest P3 value from the multiple P3 values ​​and take the zone air duct corresponding to the largest P3 value as the target zone air duct.

[0081] (3) Control the vehicle air conditioning system to distribute air volume to multiple zones. Set the air valve corresponding to the target zone air duct to the 100% position, and adjust the fan speed in a closed loop according to the required air volume of the target zone air duct and the estimated distributed air volume, so that the air volume at the outlet end of the target zone air duct reaches the required air volume of the target zone air duct; at the same time, adjust the air valve opening of other zone air ducts according to the required air volume of other zone air ducts, so that the air volume at the outlet end of other zone air ducts reaches the required air volume of other zone air ducts; wherein, other zone air ducts are the zone air ducts other than the target zone air duct among the multiple zone air ducts.

[0082] In some implementations, the fan speed can be adjusted in a closed loop using a PID algorithm based on the required air volume of the target zone duct and the allocated air volume of the target zone duct (i.e., the current outlet air volume of the target zone duct).

[0083] In some implementations, the opening of the dampers in other air ducts can be adjusted in a closed loop using a PID algorithm based on the required air volume of other air ducts and the allocated air volume of other air ducts (i.e., the current outlet air volume of other air ducts).

[0084] The following section combines formulas (1) to (3). Figure 2 and Figure 5 The process of controlling the vehicle's air conditioning system to distribute airflow to multiple zones is described in detail, including the following steps. The following description uses an example of a vehicle's air conditioning system including an air filter.

[0085] In step 501, under a certain fan speed condition, the pressure rise (P) generated by the fan is first calculated by combining the PQ characteristic curve equation of the combined fan with the equation of the current total duct resistance coefficient (K3). F ).

[0086] In step 502, the static pressure (P2) before the air filter is obtained by using the calculated fan pressure rise, combined with the intake pressure (P1) of the external circulation air inlet, the resistance coefficient (K1) of the external circulation air valve, and the resistance coefficient (K2) of the internal circulation air valve.

[0087] In step 503, based on the parameters obtained in steps 501 and 502, the total air volume (f3), internal circulation air volume (f2), and external circulation air volume (f1) of the vehicle air conditioning system are calculated.

[0088] In step 504, based on the resistance coefficient of each zone's air duct (e.g., k... 3_1 and k 3_2 The total air volume (f3) is allocated to different zone air ducts to obtain the allocated air volume for each zone air duct.

[0089] In step 505, based on the allocated air volume and required air volume of the target zone duct, a proportional-integral-derivative (PID) controller is used to control the fan speed in a closed loop to ensure that the actual air volume delivered by the target zone duct matches the required air volume. For other zone ducts, based on the allocated air volume and required air volume of each zone duct, a PID controller is used to adjust the opening of the corresponding zone duct's damper to ensure that the actual air volume delivered by each zone duct matches the required air volume.

[0090] As mentioned in step 501 above, the pressure rise (P) generated by the fan is calculated by using the PQ characteristic curve equation of the combined fan and the equation of the current total duct resistance coefficient (K3). F The specific process is as follows:

[0091] a) At a certain fan speed, the PQ curve of a centrifugal fan can be fitted to a quadratic curve, and the analytical expression of the quadratic curve satisfies:

[0092] P F =P0―k F ·(f0―f F )^2 (4)

[0093] Where (P0, f0) is the highest point on the parabola, (P F k F () represents other operating points on the PQ curve.

[0094] At a certain fan speed, the PQ curve of a mixed-flow fan can be fitted into a quadratic curve, and the analytical expression of the quadratic curve satisfies:

[0095] P F =P0+k F ·(f0―f F )^2 (5)

[0096] Where (P0, f0) is the lowest point on the parabola, (P F k F () represents other operating points on the PQ curve.

[0097] b) Operating point on the PQ curve of the fan (P F k F The total resistance coefficient k3 of the duct adapted to the fan satisfies:

[0098] P F =k3·f F ^2 (6)

[0099] In summary, if the PQ curve equation of the fan at a certain speed and the equation of the total resistance coefficient of the duct at the current time are known, the fan air volume f under the current operating condition can be calculated by combining formulas (4) and (6), or by combining formulas (5) and (6). F And fan pressure rise P F .

[0100] It should be understood that the estimation of internal and external circulation air volume and the estimation of total air volume both require the static pressure P2 before the air filter, so solving for P2 is necessary.

[0101] As mentioned in step 502 above, using the calculated fan pressure rise, combined with the intake pressure (P1) of the external circulation inlet, and the resistance coefficients (K1) and (K2) of the external circulation valve, the static pressure (P2) before the air filter can be obtained. The derivation process of P2 is as follows:

[0102] f2 = f3 - f1 (7)

[0103]

[0104] It should be noted that, without recirculation, outside and inside air enter the air conditioning system through the external and internal air intakes, respectively. Therefore:

[0105]

[0106] It should be noted that, under conditions of recirculation, outside air enters the vehicle directly through the external and internal air intakes, then:

[0107]

[0108] As mentioned in step 503 above, the total air volume (f3) of the vehicle's air conditioning system is calculated. The specific process is as follows:

[0109] Given K1, K2, K3, P F In the case of P1, according to formulas (7) to (13), P2 can be solved, and then f1 and f2 can be solved.

[0110] Simultaneously, the fan pressure rises: P F =P3-P2, which leads to: P3=P F +P2, substitute PF By combining P2 and P3, we can obtain P3.

[0111] Refer to formula (1), and f3 can be solved according to P3=K3·f3^2.

[0112] As mentioned in step 504 above, based on the resistance coefficient of each parallel branch duct (e.g., k...), 3_1 and k 3_2 The total air volume (f3) of the parallel branches is distributed to different zone ducts. According to formula (3), f can be obtained. 3_1 and f 3_2 Then, based on the parallel relationship of the air ducts, the distributed air volume of each zone air duct is calculated step by step according to formula (3) (the distributed air volume is an estimated value), and the distributed air volume of each zone air duct can be obtained.

[0113] The above text combined Figures 1 to 5 The method embodiments of this application have been described in detail below, in conjunction with... Figure 6 The apparatus embodiments of this application are described in detail below. It should be understood that the descriptions of the method embodiments correspond to the descriptions of the apparatus embodiments; therefore, any parts not described in detail can be referred to the foregoing method embodiments.

[0114] Figure 6 This is a schematic diagram of the structure of a control device for a vehicle air conditioning system according to an embodiment of this application. The vehicle air conditioning system includes a fan and air ducts. The fan supplies air to the air ducts, which include multiple zoned air ducts. Each zoned air duct has an air valve at its outlet. (See also...) Figure 6 The control device 600 of the vehicle air conditioning system may include a calculation module 610, a selection module 620, a first adjustment module 630, and a second adjustment module 640.

[0115] The calculation module 610 is used to calculate the back static pressure corresponding to satisfy the required air volume of each of the multiple partitioned air ducts when the air valve is in the fully open state, based on the required air volume and air duct resistance coefficient of each partitioned air duct, so as to obtain multiple back static pressures.

[0116] Selection module 620 is used to select a target zone air duct from the plurality of zone air ducts, wherein the target zone air duct is the zone air duct corresponding to the maximum rear static pressure among the plurality of rear static pressures.

[0117] The first adjustment module 630 is used to adjust the speed of the fan according to the required air volume of the target zone air duct, so that the air volume at the outlet end of the target zone air duct reaches the required air volume of the target zone air duct.

[0118] The second adjustment module 640 is used to adjust the opening of the air valve of the other partition air duct according to the required air volume of the other partition air duct, so that the air volume at the outlet end of the other partition air duct reaches the required air volume of the other partition air duct; wherein, the other partition air duct is the partition air duct other than the target partition air duct among the plurality of partition air ducts.

[0119] Optionally, the control device 600 of the vehicle air conditioning system further includes: a first determining module, configured to determine the total air volume delivered by the fan based on the air pressure P value of the fan, the air flow Q value of the fan, and the total resistance coefficient of the air duct after adjusting the fan speed; and a second determining module, configured to determine the distribution air volume to be allocated to each zone air duct based on the resistance coefficient of each zone air duct.

[0120] Optionally, the air duct is provided with an external circulation intake valve and an internal circulation intake valve. The external circulation intake valve is used to control the intake volume of the external circulation, and the internal circulation intake valve is used to control the intake volume of the internal circulation. The first determining module is used to: determine the pressure rise generated by the fan based on the PQ characteristic curve of the fan and the total resistance coefficient; determine the front static pressure based on the pressure rise, the resistance coefficient of the external circulation intake valve, the resistance coefficient of the internal circulation intake valve, and the intake pressure at the external circulation intake valve; and determine the total air volume based on the pressure rise, the front static pressure of the fan, and the total resistance coefficient.

[0121] Optionally, the control device 600 of the vehicle air conditioning system further includes: a control module, used to control the opening degree of the external circulation intake valve according to the resistance coefficient of the external circulation intake valve, the resistance coefficient of the internal circulation intake valve and the front static pressure after the front static pressure is determined, so that the intake pressure of the external circulation intake port is less than a preset threshold.

[0122] Optionally, the vehicle air conditioning system further includes an air filter disposed between the air inlet of the air duct and the fan. The air filter is used to filter the incoming air in the air duct, and the front static pressure is the static pressure in front of the filter.

[0123] Optionally, the control device 600 of the vehicle air conditioning system further includes: a third determining module, used to determine the required air volume of each zone's air duct based on the comfort parameters of each zone in the vehicle before obtaining the multiple rear static pressures; the comfort parameters include one or more of the following: the ambient temperature outside the zone, the air volume setting value of the zone, the set temperature of the zone, the difference between the set temperature of the zone and the current temperature of the zone, and the sunlight intensity within the zone.

[0124] Optionally, the first adjustment module 630 is used to: adjust the fan speed in a closed loop using a PID algorithm based on the required air volume of the target zone air duct and the allocated air volume of the target zone air duct; and / or, the second adjustment module 640 is used to: adjust the valve opening of the other zone air ducts in a closed loop using a PID algorithm based on the required air volume of the other zone air ducts and the allocated air volume of the other zone air ducts.

[0125] Optionally, the plurality of zoned air ducts are four-zone air ducts.

[0126] The following is combined with Figure 7 This application describes a vehicle 700 as an embodiment of the present application. The vehicle 700 can be any type of automobile mentioned above, and the vehicle 700 can be used to implement the methods described in the above method embodiments.

[0127] It should be understood that Vehicle 700 can be applied to any of the vehicle types mentioned above.

[0128] Vehicle 700 may include one or more processors 710. The processor 710 may enable vehicle 700 to implement the methods described in the preceding method embodiments.

[0129] The processor 710 can be a general-purpose processor or a special-purpose processor. For example, the processor can be a central processing unit (CPU). Alternatively, the processor can also be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or any conventional processor.

[0130] The vehicle 700 may also include one or more memories 720. The memories 720 store a program that can be executed by the processor 710 to control the vehicle 700 to perform the methods described in the preceding method embodiments. The memories 720 may be independent of the processor 710 or integrated into the processor 710.

[0131] The vehicle 700 may also include a transceiver 730. The processor 710 can communicate with other devices through the transceiver 730. For example, the processor 710 can send and receive data with other devices through the transceiver 730.

[0132] This application also provides a chip, including a processor, which can be used to call and run a computer program from memory, causing a device equipped with the chip to perform the methods described in the above method embodiments. It is understood that the processor can be any type of processor mentioned above. It is also understood that the memory can be independent of the chip or integrated into the chip.

[0133] This application also provides a machine-readable storage medium for storing a program. This program causes a computer to execute the methods described in the various embodiments of this application.

[0134] This application also provides a computer program product. The computer program product includes a program. The program causes a computer to perform the methods described in various embodiments of this application.

[0135] In the above embodiments, implementation can be achieved, in whole or in part, through software, hardware, firmware, or any other combination. When implemented in software, it can be implemented, in whole or in part, as a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of this disclosure are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a machine-readable storage medium or transmitted from one machine-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another via wired (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The machine-readable storage medium can be any available medium accessible to a computer or a data storage device such as a server or data center that integrates one or more available media. The available media can be magnetic media (e.g., floppy disks, hard disks, magnetic tapes), optical media (e.g., digital video discs (DVDs)), or semiconductor media (e.g., solid-state drives (SSDs)).

[0136] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments of this disclosure can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this disclosure.

[0137] In the several embodiments provided in this disclosure, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0138] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0139] In addition, the functional units in the various embodiments of this disclosure can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0140] The above description is merely a specific embodiment of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A control method for a vehicle air conditioning system, characterized in that, The vehicle air conditioning system includes a fan and air ducts. The fan is used to deliver airflow to the air ducts. The air ducts include multiple zoned air ducts, and each zoned air duct is equipped with an air valve at its outlet. The control method includes: With the air valve fully open, the required air volume and air resistance coefficient of each of the multiple partitioned air ducts are used to calculate the corresponding back static pressure to satisfy the required air volume of each partitioned air duct, so as to obtain multiple back static pressures. Select a target zone air duct from the plurality of zone air ducts, wherein the target zone air duct is the zone air duct corresponding to the maximum rear static pressure among the plurality of rear static pressures; According to the required air volume of the target zone air duct, the speed of the fan is adjusted so that the air volume at the outlet end of the target zone air duct reaches the required air volume of the target zone air duct. Based on the required air volume of other air ducts, adjust the opening of the air valves of the other air ducts so that the air volume at the outlet of the other air ducts reaches the required air volume of the other air ducts. The other partitioned air ducts are those other than the target partitioned air duct among the plurality of partitioned air ducts.

2. The control method according to claim 1, characterized in that, After adjusting the fan speed, the control method further includes: The total air volume delivered by the fan is determined based on the air pressure P value of the fan, the air flow rate Q value of the fan, and the total resistance coefficient of the duct. Based on the resistance coefficient of each zone air duct, the allocated air volume to be distributed to each zone air duct is determined.

3. The control method according to claim 2, characterized in that, The air duct is equipped with an external circulation intake valve and an internal circulation intake valve. The external circulation intake valve controls the intake volume of the external circulation, and the internal circulation intake valve controls the intake volume of the internal circulation. The determination of the total air volume delivered by the fan based on the fan's air pressure P, the fan's air flow rate Q, and the total resistance coefficient of the air duct includes: The pressure rise generated by the fan is determined based on the PQ characteristic curve of the fan and the total resistance coefficient. The front static pressure is determined based on the pressure rise, the resistance coefficient of the external circulation intake valve, the resistance coefficient of the internal circulation intake valve, and the intake pressure at the external circulation intake valve. The total air volume is determined based on the pressure rise, the front static pressure, and the total resistance coefficient.

4. The control method according to claim 3, characterized in that, After determining the initial static pressure, the control method further includes: Based on the resistance coefficient of the external circulation intake valve, the resistance coefficient of the internal circulation intake valve, and the front static pressure, the opening degree of the external circulation intake valve is controlled so that the intake pressure of the external circulation intake port is less than a preset threshold.

5. The control method according to claim 1, characterized in that, Before obtaining multiple post-static pressures, the control method further includes: Based on the comfort parameters of each zone in the vehicle, determine the required air volume for the air duct of each zone; The comfort parameters include one or more of the following: ambient temperature outside the vehicle in the zone, airflow setting value of the zone, set temperature of the zone, difference between set temperature and current temperature of the zone, and sunlight intensity in the zone.

6. The control method according to claim 2, characterized in that, The step of adjusting the fan speed according to the required air volume of the target zone air duct includes: Based on the required air volume of the target zone air duct and the allocated air volume of the target zone air duct, the speed of the fan is adjusted in a closed loop using a PID algorithm; And / or, The step of adjusting the opening of the dampers in other air ducts according to their required air volume includes: Based on the required air volume and the allocated air volume of the other zone air ducts, the opening degree of the air valves in the other zone air ducts is adjusted in a closed loop using a PID algorithm.

7. The control method according to any one of claims 1 to 6, characterized in that, The multiple zoned air ducts constitute a four-zone air duct system.

8. A control device for a vehicle air conditioning system, characterized in that, The vehicle air conditioning system includes a fan and air ducts. The fan delivers airflow to the air ducts, which include multiple zoned air ducts. Each zoned air duct has an air valve at its outlet. The control device includes: The calculation module is used to calculate the back static pressure corresponding to satisfy the required air volume of each of the multiple partitioned air ducts when the air valve is in the fully open state, based on the required air volume and air duct resistance coefficient of each partitioned air duct, so as to obtain multiple back static pressures. The selection module is used to select a target zone air duct from the plurality of zone air ducts, wherein the target zone air duct is the zone air duct corresponding to the maximum rear static pressure among the plurality of rear static pressures; The first adjustment module is used to adjust the speed of the fan according to the required air volume of the target zone air duct, so that the air volume at the outlet end of the target zone air duct reaches the required air volume of the target zone air duct. The second adjustment module is used to adjust the opening of the air valve of the other air duct according to the required air volume of the other air duct, so that the air volume at the outlet end of the other air duct reaches the required air volume of the other air duct. The other partitioned air ducts are those other than the target partitioned air duct among the plurality of partitioned air ducts.

9. A vehicle, characterized in that, include: Memory, used to store code; A processor is configured to execute the code stored in the memory to control the vehicle air conditioning system to perform the control method as described in any one of claims 1 to 7.

10. A computer program product, characterized in that, Includes program code, which is used to control the vehicle air conditioning system to perform the control method as described in any one of claims 1 to 7.

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