Control device and method of vehicle air conditioning system
The sensors detect the passenger seat and solar radiation intensity dynamically adjust the circulation ratio in the air conditioning system, which solves the problems of electric vehicles' power consumption and windshield fog in low temperature environments, and improves the full-electric mileage and safety of electric vehicles.
Patent Information
- Application Number
- CN202410221910.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-28
- Publication Date
- 2025-09-02
AI Technical Summary
In low temperature environments, the air conditioning system of electric vehicles cannot dynamically adjust the internal circulation ratio according to changes in the interior and exterior conditions of the vehicle, resulting in an increase in the power consumption of PTC heaters, shortening the full-electric mileage of electric vehicles or fogging in the windshield, affecting safety.
The sensors detect whether the passenger seat is riding and the solar radiation intensity, dynamically adjust the internal circulation ratio of the air conditioning system, combine the number of occupants and changes in the solar radiation intensity, optimize the position of the circulation damper, reduce the power consumption of the PTC heater, and prevent the windshield from fogging.
It improves the full electric mileage of electric vehicles in low-temperature environments, avoids fogging on the windshield, improves the safety of the vehicle and passenger comfort, and reduces the mechanical noise and wear of the circulating damper actuators.
Smart Images
Figure CN120572891A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of vehicle control, and in particular to a control device and method for a vehicle air-conditioning system. Background Art
[0002] Vehicle comfort is maintained through the vehicle's air conditioning system. Currently, vehicle air conditioning systems, or heating, ventilation, and air conditioning (HVAC) systems, have two air modes: fresh air mode (i.e., external recirculation mode) and recirculated air mode (i.e., internal recirculation mode). In electric vehicles, battery power consumption increases when heating or cooling performance is maximized. Therefore, without controlling the air entering the HVAC system (i.e., controlling the internal recirculation ratio or external recirculation ratio), vehicle driving performance cannot be optimized. Specifically, if the fresh air mode is selected as the air flow mode for the HVAC system at low ambient temperatures, the positive temperature coefficient (PTC) heater heats the air. Consequently, the all-electric range (AER) of electric vehicles decreases at low ambient temperatures compared to normal ambient temperatures. In this case, to increase the AER of electric vehicles, internal recirculation mode is typically selected to provide a portion of the HVAC intake air, and this portion of intake air is typically fixed.
[0003] However, the conditions inside and outside the vehicle may not be constant. For example, when the number of passengers in the vehicle increases, the humidity inside the vehicle will increase rapidly. If in this state, the fixed internal circulation ratio is too large, it may cause the windshield to fog up, or when the solar radiation intensity is high enough, the fixed internal circulation ratio can be set to a larger value to reduce the power consumed by the PTC heater. In this case, the AER of the electric vehicle can be increased. Therefore, the fixed internal circulation ratio cannot be adjusted due to changes in the conditions inside and outside the vehicle, resulting in an increase in the power consumed by the PTC heater, or a decrease in the AER of the electric vehicle at low ambient temperatures, or causing fogging of the windshield, or poor air quality inside the vehicle, or may also cause safety problems of the vehicle.
[0004] The above description of the background technology is only intended to facilitate an in-depth understanding of the technical solution of the present invention (such as the technical means used, the technical problems solved, and the technical effects produced), and should not be regarded as an admission or any form of implication that the information constitutes prior art already known to those skilled in the art. Summary of the Invention
[0005] The present invention aims to provide a method and apparatus for controlling a vehicle air conditioning system, which can ensure that an internal circulation mode is used as much as possible to reduce the power consumed by a positive temperature coefficient (PTC) heater, thereby maximizing the all-electric range (AER) of an electric vehicle in low-temperature environments, while simultaneously preventing windshield fogging, thereby avoiding vehicle safety issues caused by fogging.
[0006] According to one embodiment of the present invention, a control device for a vehicle air-conditioning system is provided, comprising: at least one sensor configured to respectively detect whether a passenger seat is occupied and the intensity of solar radiation; a first processor configured to determine the total number of occupants in the vehicle by detecting whether the passenger seat is occupied by the sensor, and preliminarily determine the internal circulation ratio of the vehicle air-conditioning system based on the determined number of all occupants in the vehicle; a second processor configured to adjust the internal circulation ratio preliminarily determined by the first processor based on the intensity of solar radiation detected by the sensor; and a controller configured to control the vehicle air-conditioning system based on the internal circulation ratio adjusted by the second processor.
[0007] Each passenger seat of the vehicle is provided with a sensor for detecting whether there is someone sitting there; the first processor may be configured to determine the total number of occupants in the vehicle based on the number of passenger seats detected to be occupied.
[0008] The vehicle may include front passenger seats and rear passenger seats, and only the front passenger seats are provided with sensors for detecting whether there are people sitting in them; the first processor may be configured to: determine that the total number of passengers in the vehicle is five based on the sensor detecting that there are people sitting in the front passenger seats; determine that the total number of passengers in the vehicle is three based on the sensor detecting that there are no people sitting in the front passenger seats.
[0009] The first processor may be configured such that, under the same ambient temperature, an inner circulation ratio preliminarily determined based on a relatively large total number of occupants is less than or equal to an inner circulation ratio preliminarily determined based on a relatively small total number of occupants.
[0010] The first processor may be configured such that, under the same total number of occupants and ambient temperature, the internal circulation ratio when the front passenger seat is unoccupied is greater than or equal to the internal circulation ratio when the front passenger seat is occupied.
[0011] The second processor may be configured to convert instantaneous changes in solar radiation intensity detected by the sensor into changes at a predetermined rate, and adjust the inner loop ratio preliminarily determined by the first processor according to the converted solar radiation intensity.
[0012] The second processor can be configured as follows: when the solar radiation intensity increases instantaneously from any value to a first value, the converted solar radiation intensity increases from the current value at a first predetermined rate until the converted solar radiation intensity increases to the first value or the solar radiation intensity changes instantaneously from the first value to another value; when the solar radiation intensity decreases instantaneously from any value to a second value, the converted solar radiation intensity decreases from the current value at a second predetermined rate that is greater than the first predetermined rate until the converted solar radiation intensity decreases to the second value or the solar radiation intensity changes instantaneously from the second value to another value.
[0013] The second processor can be configured as follows: when the solar radiation intensity is less than a first threshold value, the preliminarily determined inner circulation ratio remains unchanged; when the solar radiation intensity is greater than or equal to the first threshold value and less than or equal to a second threshold value that is larger than the first threshold value, the preliminarily determined inner circulation ratio is increased by a first reference value; when the solar radiation intensity is greater than the second threshold value, the preliminarily determined inner circulation ratio is increased by a second reference value that is larger than the first reference value.
[0014] The sensor for detecting whether the passenger seat is occupied may be a seat pressure sensor, and the sensor for detecting the intensity of solar radiation may be a light sensor.
[0015] According to another embodiment of the present invention, a method for controlling a vehicle air-conditioning system is provided, the method comprising the following steps: respectively detecting whether a passenger seat is occupied and the intensity of solar radiation; determining the total number of occupants in the vehicle by detecting whether the passenger seat is occupied; preliminarily determining an internal circulation ratio of the vehicle air-conditioning system based on the determined number of all occupants in the vehicle; adjusting the preliminarily determined internal circulation ratio by the detected intensity of solar radiation; and controlling the vehicle air-conditioning system based on the adjusted internal circulation ratio.
[0016] Determining the total number of occupants in the vehicle may include the following steps: detecting whether each passenger seat of the vehicle is occupied; and determining the total number of occupants in the vehicle based on the number of passenger seats detected to be occupied.
[0017] The vehicle includes front passenger seats and rear passenger seats, and determining the total number of passengers in the vehicle may include the following steps: detecting whether the front passenger seats of the vehicle are occupied; when the front passenger seats are occupied, determining that the total number of passengers in the vehicle is five; when the front passenger seats are unoccupied, determining that the total number of passengers in the vehicle is three.
[0018] Preliminarily determining the internal circulation ratio of the vehicle air-conditioning system may include the following steps: under the same ambient temperature, determining the internal circulation ratio preliminarily determined based on the total number of relatively more occupants to be less than or equal to the internal circulation ratio preliminarily determined based on the total number of relatively fewer occupants.
[0019] Preliminary determination of the internal circulation ratio of the vehicle air-conditioning system may include the following steps: under the same total number of occupants and ambient temperature, determining the internal circulation ratio when the front passenger seat is unoccupied to be greater than or equal to the internal circulation ratio when the front passenger seat is occupied.
[0020] Adjusting the preliminarily determined internal circulation ratio by the detected solar radiation intensity may include the following steps: converting the instantaneous change of the detected solar radiation intensity into a change at a predetermined rate; and adjusting the preliminarily determined internal circulation ratio according to the converted solar radiation intensity.
[0021] When the solar radiation intensity increases instantaneously from any value to a first value, the converted solar radiation intensity increases from the current value at a first predetermined rate until the converted solar radiation intensity increases to the first value or the solar radiation intensity changes instantaneously from the first value to another value; when the solar radiation intensity decreases instantaneously from any value to a second value, the converted solar radiation intensity decreases from the current value at a second predetermined rate that is greater than the first predetermined rate until the converted solar radiation intensity decreases to the second value or the solar radiation intensity changes instantaneously from the second value to another value.
[0022] Adjusting the preliminarily determined internal circulation ratio may include the following steps: when the solar radiation intensity is less than a first threshold value, keeping the preliminarily determined internal circulation ratio unchanged; when the solar radiation intensity is greater than or equal to the first threshold value and less than or equal to a second threshold value that is larger than the first threshold value, increasing the preliminarily determined internal circulation ratio by a first reference value; and when the solar radiation intensity is greater than the second threshold value, increasing the preliminarily determined internal circulation ratio by a second reference value that is larger than the first reference value.
[0023] The present invention adopts the above technical solution, which has the following beneficial effects: the present invention preliminarily determines the internal circulation ratio based on the total number of passengers on the vehicle, and further adjusts the internal circulation ratio according to the intensity of solar radiation, which can ensure that the internal circulation mode is used as much as possible to reduce the electric energy consumed by the PTC heater. Therefore, the AER of the electric vehicle in a low-temperature environment can be increased as much as possible, and at the same time, the windshield can be prevented from fogging, thereby avoiding safety problems of the vehicle caused by fogging. In addition, by converting the instantaneous change of the original solar radiation intensity into a change at a predetermined rate. When the solar radiation intensity changes frequently due to the vehicle passing through multiple buildings, the position of the circulating damper can be avoided from moving repeatedly. Therefore, it is beneficial to improve the durability of the actuator of the circulating damper and reduce the mechanical noise generated by the actuator of the circulating damper during operation. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] The following will describe exemplary embodiments of the present invention in more detail with reference to the accompanying drawings. For clarity, identical components in different drawings are indicated by identical reference numerals. It should be noted that the drawings are for illustrative purposes only and are not necessarily drawn to scale. In these drawings:
[0025] Figure 1 Schematic diagram showing the structure of an HVAC system that implements an internal circulation mode and a fresh air mode.
[0026] Figure 2 is a block diagram showing an overall configuration of a control device of a vehicle air-conditioning system according to an embodiment of the present invention.
[0027] Figure 3 Graph showing humidity near the windshield when the ambient temperature is 0°C.
[0028] Figure 4A and Figure 4B A graph exemplarily illustrates the solar radiation intensity detected by the sensor and the solar radiation intensity converted by the second processor.
[0029] Figure 5 A schematic diagram showing the position change of the circulation damper when the internal circulation ratio is adjusted according to the intensity of solar radiation.
[0030] Figure 6 is a block diagram of a detailed configuration of a control device of a vehicle air-conditioning system according to an embodiment of the present invention.
[0031] Figure 7 is a flowchart of a control method of a control system of a vehicle according to an embodiment of the present invention. DETAILED DESCRIPTION
[0032] The following is a detailed description of the implementation scheme of the present invention. This implementation scheme is implemented on the premise of the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following implementation scheme.
[0033] A vehicle air conditioning system, also known as a vehicle heating, ventilation and air conditioning (HVAC) system, can provide heating, ventilation or conditioning for a vehicle cabin. Figure 1 Schematic diagram showing the structure of an HVAC system that implements an internal circulation mode and a fresh air mode. Figure 1 As shown, the HVAC system includes a fresh air inlet 110, a cabin return air vent 120, and a recirculation damper 130. Intake air is drawn in by a blower (not shown). The recirculation damper 130 is used to select between fresh air and recirculated air for delivery to the inlet of the blower.
[0034] Figure 1 The example shows a case where the internal recirculation ratio (i.e., the proportion of internal recirculated intake air) is 30% and the fresh air ratio (i.e., the proportion of fresh air intake) is 70%. When the recirculation damper 130 moves to the left in the figure, the cabin return air vent 120 can be completely closed, achieving a full fresh air mode. When the recirculation damper 130 moves to the right in the figure, the fresh air inlet 110 can be completely closed, achieving a full internal recirculation mode.
[0035] When the full fresh air mode is selected, the positive temperature coefficient (PTC) heater of the HVAC system 100 may heat the air. Therefore, the all-electric range (AER) of the electric vehicle is reduced at low ambient temperatures compared to normal ambient temperatures. When the full recirculation mode is selected, the vehicle windows may fog up at low ambient temperatures. Therefore, the present invention provides a vehicle HVAC control device that optimizes battery power consumption without fogging the inner surface of the vehicle windows by controlling the recirculation damper 130 to select between 100% recirculated air and 100% fresh air.
[0036] Figure 2 1 is a block diagram showing the overall configuration of a control device for a vehicle air conditioning system according to an embodiment of the present invention. Figure 2 As shown, the control device 200 of the vehicle air-conditioning system 100 according to the embodiment of the present invention includes at least one sensor 210 , a first processor 220 , a second processor 230 , and a controller 240 .
[0037] At least one sensor 210 is configured to detect whether a passenger seat is occupied and the intensity of solar radiation, respectively. A first processor 220 is configured to determine the total number of vehicle occupants based on whether the passenger seat is occupied as detected by sensor 210, and to preliminarily determine the recirculation ratio of the vehicle air conditioning system 100 based on the determined number of all vehicle occupants. A second processor 230 is configured to adjust the recirculation ratio preliminarily determined by the first processor 220 based on the intensity of solar radiation detected by sensor 210. A controller 240 is configured to control the vehicle air conditioning system 100 based on the recirculation ratio adjusted by the second processor 230. Specifically, the controller 240 controls the position of the recirculation damper 130 within the vehicle air conditioning system 100 based on the recirculation ratio adjusted by the second processor 230.
[0038] Therefore, according to an embodiment of the present invention, the total number of vehicle occupants is expressed as the output of the vehicle's interior humidity. The output of the vehicle's interior humidity can affect windshield fogging. Therefore, the internal recirculation ratio can be preliminarily determined based on the total number of vehicle occupants. The internal recirculation ratio can be further adjusted based on solar radiation intensity, thereby increasing the all-electric range (AER) of electric vehicles in low-temperature environments without causing windshield fogging.
[0039] Specifically, each passenger seat in the vehicle is equipped with a sensor 210 for detecting whether the corresponding seat is occupied. The first processor 220 is configured to determine the total number of occupants in the vehicle based on the number of sensors 210 that detect occupants. Such sensors 210 may be seat pressure sensors or seat belt sensors. When any sensor 210 detects that the corresponding passenger seat is occupied, a detection result signal may be sent to the first processor 220, which then accumulates the number of occupied passenger seats. Thus, the number of passenger seats detected as occupied represents the total number of occupants in the vehicle. Typically, a vehicle includes a front driver's seat, a front passenger seat, and three rear passenger seats. Therefore, the total number of occupants in the vehicle is typically between one and five. However, the present invention is also applicable to other types of vehicles, in which case the total number of occupants may be greater than five.
[0040] According to the above embodiment, the total number of passengers can be accurately obtained. However, in some vehicles, only the front passenger seats are provided with sensors 210 for detecting whether there are people sitting. In this case, the first processor 220 can determine the total number of passengers on the vehicle based on the maximum number of passengers on the vehicle.
[0041] For example, a vehicle includes a front driver's seat, a front passenger seat, and three rear passenger seats. If only the front passenger seat is equipped with a sensor 210 for detecting occupancy, when sensor 210 detects that the front passenger seat is occupied, a detection result signal may be sent to first processor 220. Since all three rear passenger seats may be occupied, the maximum number of occupants in the vehicle is five (i.e., including the driver, the front passenger, and the three rear passengers). Based on sensor 210 detecting that the front passenger seat is occupied, first processor 220 may determine that the total number of occupants in the vehicle is five. When sensor 210 detects that the front passenger seat is unoccupied, a detection result signal may be sent to the first processor. If the front seat is unoccupied, the rear seat typically will not be occupied by three people, and may only have two people in the rear seat. Therefore, the maximum number of occupants in the vehicle is three (i.e., including the driver and the two rear passengers). Based on sensor 210 detecting that the front passenger seat is unoccupied, first processor 220 may determine that the total number of occupants in the vehicle is three.
[0042] According to an embodiment of the present invention, the first processor 220 preliminarily determines the internal circulation ratio of the vehicle air conditioning system according to the determined number of all passengers in the vehicle.
[0043] Table 1 shows the internal circulation ratios preliminarily determined according to the total number of passengers in the vehicle under different ambient temperature (AMB) conditions when all passenger seats are provided with sensors for detecting whether there are people sitting on them.
[0044] Table 1
[0045]
[0046] Table 2 shows the internal circulation ratio preliminarily determined according to the total number of passengers in the vehicle under different ambient temperature conditions when only the front passenger seat is provided with a sensor for detecting whether there is someone sitting in the seat.
[0047] Table 2
[0048]
[0049] Taking the data in Table 1 as an example, when the ambient temperature is 0°C and the total number of passengers on the vehicle is 1 or 2, the internal circulation ratio is 30%. When the total number of passengers on the vehicle is 3 or more, the internal circulation ratio is 20%.
[0050] The total number of vehicle occupants is expressed as the output of vehicle interior humidity. When the total number of occupants is high, the humidity output from occupants' breathing, talking, and other activities increases the vehicle's interior humidity, thereby increasing the risk of windshield fogging. Therefore, the internal recirculation ratio can be reduced to reduce the risk of windshield fogging caused by a large number of occupants.
[0051] That is, under the same ambient temperature, the internal circulation ratio preliminarily determined based on the total number of relatively more occupants is less than or equal to the internal circulation ratio preliminarily determined based on the total number of relatively fewer occupants.
[0052] In addition to preliminarily determining the inner circulation ratio according to the total number of all passengers in the vehicle, the first processor may further preliminarily determine the inner circulation ratio according to the seating positions of the passengers.
[0053] In Table 1, when the total number of passengers in the vehicle is three, there can be a driver and two passengers in the back row, or there can be a driver, a passenger in the front row, and a passenger in the back row. Therefore, for these two situations, we can further consider the seating positions of the passengers to preliminarily determine different internal circulation ratios.
[0054] In Table 2, the total number of passengers on the vehicle is three, showing only the driver and two rear passengers. Combining Tables 1 and 2, it can be seen that the internal recirculation ratios in Table 1 and Table 2 are not exactly the same. For example, at an ambient temperature of -10°C and a total number of passengers on the vehicle, the internal recirculation ratio in Table 1 is 20%, while the internal recirculation ratio in Table 2 is 30%.
[0055] Preventing fogging of car windows is mainly to prevent the windshield from fogging up, which can cause safety problems. Compared with passengers sitting in the back seat, the humidity generated by passengers sitting in the front seat has a greater impact on whether the windshield fogs up. Figure 3 is a graph showing the humidity near the windshield when the ambient temperature is 0°C. Figure 3 As shown, adding a front passenger increases humidity by 2.8%. Adding a rear passenger increases humidity by 1.2%. Therefore, the humidity impact of two rear passengers on the windshield is roughly equivalent to that of one front passenger. Therefore, when the front passenger seat is occupied, the recirculation ratio can be reduced to reduce the risk of windshield fogging.
[0056] That is, under the same total number of occupants and ambient temperature, the internal circulation ratio when the front passenger seat is unoccupied is greater than or equal to the internal circulation ratio when the front passenger seat is occupied.
[0057] According to an embodiment of the present invention, the second processor 230 is configured to adjust the inner cycle ratio preliminarily determined by the first processor 220 according to the solar radiation intensity. When the solar radiation intensity is high enough, the preliminarily determined inner cycle ratio can be adjusted to a larger value, thereby reducing the power consumed by the PTC heater and increasing the AER of the electric vehicle in a low temperature environment (e.g., winter).
[0058] Specifically, sensor 210 can detect solar radiation intensity. Such sensor 210 can be a light sensor. The light sensor can be mounted below the vehicle's windshield. The light sensor can convert solar radiation into a voltage value and transmit the voltage value to the second processor. In other words, the solar radiation intensity can be represented by a feedback voltage from the light sensor.
[0059] When the solar radiation intensity is less than the first threshold, the second processor 230 may keep the initially determined inner circulation ratio unchanged. When the solar radiation intensity is greater than or equal to the first threshold and less than or equal to a second threshold greater than the first threshold, the second processor 230 may increase the initially determined inner circulation ratio by a first reference value. When the solar radiation intensity is greater than the second threshold, the second processor 230 may increase the initially determined inner circulation ratio by a second reference value greater than the first reference value.
[0060] In a specific example, the first threshold value may be 0.8 V, and the second threshold value may be 1.4 V. The first reference value may be 5%, and the second reference value may be 10%, but the present invention is not limited thereto.
[0061] However, when a vehicle is traveling on a city road, the shadows of buildings will affect the intensity of solar radiation, causing the intensity of solar radiation to change frequently. As the vehicle enters or leaves the shadow area, the change in the intensity of solar radiation is large enough to cause the second processor 230 to adjust the inner circulation ratio. Due to the change in the inner circulation ratio, the controller 240 controls the movement position of the circulation damper 130. In the case where the vehicle passes through multiple buildings, the repeated movement of the circulation damper 130 may cause the durability of the actuator of the circulation damper 130 to deteriorate. In addition, the actuator of the circulation damper 130 will inevitably generate mechanical noise when it is in motion, and the mechanical noise will bring a poor user experience.
[0062] To solve the above problem, the second processor 230 can be configured to convert the instantaneous change of solar radiation intensity detected by the sensor 210 into a change at a predetermined rate, and adjust the inner loop ratio preliminarily determined by the first processor 220 according to the converted solar radiation intensity.
[0063] Specifically, when the solar radiation intensity increases instantaneously from any value (e.g., value a) to another value (e.g., value b), the converted solar radiation intensity may increase from the current value at a first predetermined rate k1 until the converted solar radiation intensity increases to value b or the solar radiation intensity instantaneously changes from value b to another value (e.g., value c). When the solar radiation intensity decreases instantaneously from any value (e.g., value a) to another value (e.g., value b), the converted solar radiation intensity may decrease from the current value at a second predetermined rate k2 until the converted solar radiation intensity decreases to value b or the solar radiation intensity instantaneously changes from value b to another value (e.g., value c).
[0064] Among them, the second preset rate k2 is greater than the first preset rate k1. The decrease in solar radiation intensity indicates that the vehicle has entered the shadow area. In order to prevent the windshield from fogging, the converted solar radiation intensity decreases at a faster rate, so the inner circulation ratio needs to be reduced as quickly as possible. The increase in solar radiation intensity indicates that the vehicle has left the shadow area. At this time, sufficient time can be used to determine that the vehicle is not in the shadow area before increasing the inner circulation ratio. Therefore, the converted solar radiation intensity should increase at a slower rate. Therefore, the second preset rate k2 is greater than the first preset rate k1. In a specific example, the first preset rate k1 can be 0.025V / s, and the second preset rate k2 can be 0.05V / s, but the present invention is not limited to this.
[0065] Figure 4A and Figure 4B A graph exemplarily illustrates the solar radiation intensity detected by the sensor and the solar radiation intensity curve converted by the second processor.
[0066] like Figure 4A As shown, the original solar radiation intensity curve (i.e., the curve of the feedback voltage of the light sensor) increases instantly from 0.2V to 1.5V at the 30th second. In this case, the converted solar radiation intensity can increase from the current value of 0.3V at a first predetermined rate of 0.025V / s at the 30th second. At 82 seconds, the converted solar radiation intensity increases to 1.5V. Before the original solar radiation intensity changes instantaneously again, the converted solar radiation intensity remains at 1.5V. Subsequently, the original solar radiation intensity curve decreases instantly from 1.5V to 0.9V again at the 96th second. In this case, the converted solar radiation intensity can decrease from the current value of 1.5V at a second predetermined rate of 0.05V / s at the 96th second, and can finally decrease to 0.9V at the 108th second.
[0067] Assume that the size of the inner loop ratio initially determined by the first processor is A%. According to Figure 4AThe original solar radiation intensity and the internal circulation ratio change process are: A% to (A% + 5%) to (A% + 10%) to (A% + 5%). Figure 4A The change process of the converted solar radiation intensity and the internal circulation ratio is: A% to (A% + 5%) to (A% + 10%) to (A% + 5%). Figure 4A The time after the increase in solar radiation intensity is maintained is long enough, so whether it is the internal circulation ratio adjusted according to the original solar radiation intensity or the internal circulation ratio adjusted according to the converted solar radiation intensity, the internal circulation ratio can be increased by 10%.
[0068] like Figure 4B As shown, Figure 4A Similarly, the original solar radiation intensity curve increases from 0.3V to 1.5V instantly at the 30th second. In this case, the converted solar radiation intensity can increase from the current value of 0.3V at the first predetermined rate of 0.025V / s at the 30th second. Figure 4A The difference is that the original solar radiation intensity curve instantly decreases from 1.5 V to 0.9 V at 74.67 seconds. The converted solar radiation intensity increases to 1.32 V at 74.67 seconds. Because the original solar radiation intensity undergoes another instantaneous change, the converted solar radiation intensity cannot continue to increase at the first predetermined rate of 0.025 V / s. Instead, it decreases from the current value of 1.32 V at a second predetermined rate of 0.05 V / s at 74.67 seconds and can be reduced to 0.9 V at 83 seconds.
[0069] according to Figure 4B The original solar radiation intensity and the internal circulation ratio change process are: A% to (A% + 5%) to (A% + 10%) to (A% + 5%). Figure 4B The change in the internal recycling ratio after the conversion of the solar radiation intensity is shown as: A% to (A% + 5%). In this process, since the increase in solar radiation intensity lasts for a short time, the internal recycling ratio adjusted according to the converted solar radiation intensity can only increase by 5%.
[0070] Figure 5 The figure shows the position change of the circulation damper when the internal circulation ratio is adjusted according to the solar radiation intensity. Figure 5As shown, Curve M shows the position change of the recirculation damper when the internal recirculation ratio is adjusted based on the original solar radiation intensity. Curve N shows the position change of the recirculation damper when the internal recirculation ratio is adjusted based on the converted solar radiation intensity. Comparing Curves M and N, it can be seen that by converting the instantaneous changes in the original solar radiation intensity into changes at a predetermined rate, repeated movement of the recirculation damper position can be avoided. This improves the durability of the recirculation damper actuator and reduces the mechanical noise generated by the recirculation damper actuator during operation.
[0071] Figure 6 FIG is a block diagram of a detailed configuration of a control device for a vehicle air conditioning system according to an embodiment of the present invention. Figure 6 As shown, the sensor 210 may include a seat pressure sensor 211 and a light sensor 212. The first processor, the second processor, and the controller may be implemented by the HVAC control unit 250. The HVAC control unit 250 controls the position of the recirculation damper 130 according to the adjusted internal recirculation ratio.
[0072] Figure 7 FIG. 1 is a flow chart of a control method of a control system of a vehicle according to an embodiment of the present invention. Figure 7 As shown, the ignition of the vehicle is turned on (IG ON) and the blower is turned on (S10). Intake air flows into the blower, and the intake air includes fresh air from the fresh air inlet and / or recirculated air from the cabin return air vent, and the proportion of the recirculated intake air is determined by the recirculation damper.
[0073] After the vehicle's ignition is turned on and the blower is turned on (S10), a check is performed to see if any passenger seat is occupied (S11). The total number of occupants in the vehicle is determined based on the detected occupants (S12). Specifically, each passenger seat in the vehicle is checked to see if it is occupied. The total number of occupants in the vehicle is determined based on the number of passenger seats detected to be occupied.
[0074] For example, if a vehicle includes a front passenger seat and three rear passenger seats, only the front passenger seat can be detected to see if it is occupied. If the front passenger seat is occupied, the total number of occupants in the vehicle is determined to be five. If the front passenger seat is unoccupied, the total number of occupants in the vehicle is determined to be three.
[0075] The internal recirculation ratio of the vehicle air conditioning system is preliminarily determined based on the determined number of all vehicle occupants (S13). Specifically, at the same ambient temperature, the internal recirculation ratio preliminarily determined based on the total number of relatively more occupants is determined to be less than or equal to the internal recirculation ratio preliminarily determined based on the total number of relatively fewer occupants. At the same total number of occupants and ambient temperature, the internal recirculation ratio when the front passenger seat is unoccupied is determined to be greater than or equal to the internal recirculation ratio when the front passenger seat is occupied.
[0076] After the vehicle's ignition is turned on and the blower is turned on (S10), the solar radiation intensity is detected (S14), and the preliminarily determined inner circulation ratio is adjusted based on the detected solar radiation intensity (S15). Specifically, when the solar radiation intensity is less than a first threshold, the preliminarily determined inner circulation ratio remains unchanged. When the solar radiation intensity is greater than or equal to the first threshold and less than or equal to a second threshold greater than the first threshold, the preliminarily determined inner circulation ratio is increased by a first reference value. When the solar radiation intensity is greater than a second threshold, the preliminarily determined inner circulation ratio is increased by a second reference value greater than the first reference value.
[0077] According to the embodiment of the present invention, the instantaneous change of the detected solar radiation intensity can be converted into a change at a predetermined rate, and the preliminarily determined internal circulation ratio can be adjusted according to the converted solar radiation intensity.
[0078] Specifically, when the solar radiation intensity increases instantaneously from any value to a first value, the converted solar radiation intensity increases from the current value at a first predetermined rate until the converted solar radiation intensity increases to the first value or the solar radiation intensity (i.e., the detected solar radiation intensity) changes instantaneously from the first value to another value. When the solar radiation intensity decreases instantaneously from any value to a second value, the converted solar radiation intensity decreases from the current value at a second predetermined rate greater than the first predetermined rate until the converted solar radiation intensity decreases to the second value or the solar radiation intensity (i.e., the detected solar radiation intensity) changes instantaneously from the second value to another value. Similarly, for the converted solar radiation intensity, when the solar radiation intensity is less than a first threshold, the preliminarily determined inner circulation ratio remains unchanged. When the solar radiation intensity is greater than or equal to the first threshold and less than or equal to a second threshold greater than the first threshold, the preliminarily determined inner circulation ratio is increased by a first reference value. When the solar radiation intensity is greater than the second threshold, the preliminarily determined inner circulation ratio is increased by a second reference value greater than the first reference value.
[0079] The vehicle air conditioning system is controlled according to the adjusted internal circulation ratio (S16), that is, the position of the circulation damper of the vehicle air conditioning system is controlled.
[0080] The vehicle air conditioning system control device and method according to the embodiments of the present invention preliminarily determines the internal recirculation ratio based on the total number of vehicle occupants and further adjusts the internal recirculation ratio based on solar radiation intensity, ensuring that the internal recirculation mode is used as much as possible to reduce the power consumed by the PTC heater. This maximizes the AER of electric vehicles in low-temperature environments while simultaneously preventing windshield fogging, thereby avoiding vehicle safety issues caused by fogging.
[0081] By converting instantaneous changes in solar radiation intensity into changes at a predetermined rate, the present invention can prevent the recirculation damper from repeatedly shifting when solar radiation intensity fluctuates frequently due to a vehicle passing through multiple buildings. This improves the durability of the recirculation damper actuator and reduces mechanical noise generated by the actuator during operation.
[0082] The various embodiments of the invention are not an exhaustive list of all possible combinations, but are intended to describe representative aspects of the invention, and what is described in terms of various embodiments can be applied independently or in combinations of two or more.
[0083] The descriptions presented in the above exemplary embodiments are only intended to illustrate the technical solutions of the present invention and are not intended to be exhaustive or to limit the present invention to the precise forms described. Obviously, it is possible for a person of ordinary skill in the art to make many changes and variations based on the above teachings. The exemplary embodiments are selected and described to explain the specific principles of the present invention and its practical applications, so that other persons of ordinary skill in the art can easily understand, implement and utilize the various exemplary embodiments of the present invention and its various selected forms and modified forms. The scope of protection of the present invention is intended to be defined by the appended claims and their equivalents.
Claims
1. A control device for a vehicle air conditioning system, comprising: at least one sensor configured to detect whether the passenger seat is occupied and solar radiation intensity, respectively; a first processor configured to determine the total number of occupants in the vehicle by detecting whether a passenger seat is occupied by someone by a sensor, and preliminarily determine an internal circulation ratio of the vehicle air conditioning system based on the determined number of all occupants in the vehicle; a second processor configured to adjust the inner circulation ratio preliminarily determined by the first processor according to the solar radiation intensity detected by the sensor; as well as The controller is configured to control the vehicle air conditioning system according to the internal circulation ratio adjusted by the second processor.
2. The control device for a vehicle air conditioning system according to claim 1, wherein: Each passenger seat of the vehicle is provided with a sensor for detecting whether there is someone sitting there; The first processor is configured as follows: Based on the number of passenger seats detected to be occupied, the total number of occupants in the vehicle is determined.
3. The control device for a vehicle air conditioning system according to claim 1, wherein: The vehicle includes a front passenger seat and a rear passenger seat, and only the front passenger seat is provided with a sensor for detecting whether someone is sitting in the seat; The first processor is configured as follows: Based on the sensor detecting that the front passenger seat is occupied, it is determined that the total number of occupants in the vehicle is five; Based on the sensor detecting that the front passenger seat is unoccupied, it is determined that the total number of occupants in the vehicle is three.
4. The control device for a vehicle air conditioning system according to claim 2 or 3, wherein: The first processor is configured such that, under the same ambient temperature, an inner circulation ratio preliminarily determined based on a relatively large total number of occupants is less than or equal to an inner circulation ratio preliminarily determined based on a relatively small total number of occupants.
5. The control device for a vehicle air conditioning system according to claim 2, wherein: The first processor is configured such that, under the same total number of occupants and ambient temperature, the internal circulation ratio when no one is sitting in the front passenger seat is greater than or equal to the internal circulation ratio when someone is sitting in the front passenger seat.
6. The control device for a vehicle air conditioning system according to claim 1, wherein: The second processor is configured to convert instantaneous changes in solar radiation intensity detected by the sensor into changes at a predetermined rate, and adjust the inner loop ratio preliminarily determined by the first processor according to the converted solar radiation intensity.
7. The control device for a vehicle air conditioning system according to claim 6, wherein: The second processor is configured as follows: When the solar radiation intensity increases instantaneously from any value to a first value, the converted solar radiation intensity increases from the current value at a first predetermined rate until the converted solar radiation intensity increases to the first value or the solar radiation intensity changes instantaneously from the first value to another value; When the solar radiation intensity decreases instantaneously from any value to a second value, the converted solar radiation intensity decreases from the current value at a second predetermined rate that is greater than the first predetermined rate until the converted solar radiation intensity decreases to the second value or the solar radiation intensity changes instantaneously from the second value to another value.
8. The control device for a vehicle air conditioning system according to claim 1 or 6, wherein: The second processor is configured as follows: When the solar radiation intensity is less than the first threshold, the initially determined internal circulation ratio remains unchanged; When the solar radiation intensity is greater than or equal to a first threshold and less than or equal to a second threshold that is greater than the first threshold, increasing the initially determined internal circulation ratio by a first reference value; When the solar radiation intensity is greater than a second threshold, the initially determined internal circulation ratio is increased by a second reference value that is greater than the first reference value.
9. The control device for a vehicle air conditioning system according to claim 1, wherein: The sensor that detects whether the passenger seat is occupied is a seat pressure sensor, and the sensor that detects the intensity of solar radiation is a light sensor.
10. A method for controlling a vehicle air conditioning system, the method comprising the following steps: Detect whether the passenger seat is occupied and the intensity of solar radiation respectively; Determining the total number of occupants in the vehicle by detecting whether passenger seats are occupied; Preliminarily determine the internal circulation ratio of the vehicle air conditioning system based on the number of all passengers in the vehicle; Adjust the preliminarily determined internal circulation ratio according to the detected solar radiation intensity; as well as The vehicle air conditioning system is controlled according to the adjusted internal circulation ratio.
11. The control method of the vehicle air conditioning system according to claim 10, wherein: Determining the total number of occupants in a vehicle involves the following steps: Detecting whether each passenger seat in the vehicle is occupied; and Based on the number of passenger seats detected to be occupied, the total number of occupants in the vehicle is determined.
12. The method for controlling a vehicle air conditioning system according to claim 10, wherein: The vehicle includes front passenger seats and rear passenger seats, and determining the total number of occupants in the vehicle includes the following steps: Detect whether there is anyone sitting in the front passenger seat of the vehicle; When the front passenger seat is occupied, the total number of occupants in the vehicle is determined to be five; and When the front passenger seat is unoccupied, it is determined that the total number of occupants in the vehicle is three.
13. The control method of a vehicle air conditioning system according to claim 11 or 12, wherein: The initial determination of the internal circulation ratio of the vehicle air conditioning system includes the following steps: Under the same ambient temperature, the inner circulation ratio preliminarily determined based on the total number of relatively more occupants is determined to be smaller than or equal to the inner circulation ratio preliminarily determined based on the total number of relatively fewer occupants.
14. The control method of the vehicle air conditioning system according to claim 11, wherein: The initial determination of the internal circulation ratio of the vehicle air conditioning system includes the following steps: Under the same total number of occupants and ambient temperature, the internal circulation ratio when the front passenger seat is unoccupied is determined to be greater than or equal to the internal circulation ratio when the front passenger seat is occupied.
15. The control method of the vehicle air conditioning system according to claim 10, wherein: Adjusting the preliminarily determined internal circulation ratio based on the detected solar radiation intensity includes the following steps: Converting the detected instantaneous change of solar radiation intensity into a change at a predetermined rate; The initially determined internal circulation ratio is adjusted according to the converted solar radiation intensity.
16. The method for controlling a vehicle air conditioning system according to claim 15, wherein: When the solar radiation intensity increases instantaneously from any value to a first value, the converted solar radiation intensity increases from the current value at a first predetermined rate until the converted solar radiation intensity increases to the first value or the solar radiation intensity changes instantaneously from the first value to another value; When the solar radiation intensity decreases instantaneously from any value to a second value, the converted solar radiation intensity decreases from the current value at a second predetermined rate that is greater than the first predetermined rate until the converted solar radiation intensity decreases to the second value or the solar radiation intensity changes instantaneously from the second value to another value.
17. The method for controlling a vehicle air conditioning system according to claim 10 or 15, wherein: Adjusting the initially determined internal circulation ratio includes the following steps: When the solar radiation intensity is less than the first threshold, the initially determined internal circulation ratio remains unchanged; When the solar radiation intensity is greater than or equal to a first threshold and less than or equal to a second threshold that is greater than the first threshold, increasing the preliminarily determined internal circulation ratio by a first reference value; and When the solar radiation intensity is greater than a second threshold, the initially determined internal circulation ratio is increased by a second reference value that is greater than the first reference value.