A control method, system, electronic device, and vehicle for preventing car windows from fogging up.

Abstract

This invention relates to a control method, system, electronic device, and vehicle for preventing vehicle window fogging. The control method includes: determining the probability of fogging of the side windows based on the side window glass temperature and dew point temperature when the vehicle's defogger is not activated; determining the probability of fogging of the windshield based on the windshield temperature and dew point temperature; and activating the defogger when the smaller of the side window fogging probability and the windshield fogging probability is greater than or equal to a preset fogging probability. This invention also provides a control system for preventing vehicle window fogging. Furthermore, this invention provides an electronic device and a vehicle. This invention solves the problem of large errors in existing vehicles that rely solely on windshield temperature and humidity sensors to determine the risk of fogging inside the vehicle. It also solves the problem of not being able to promptly defog the side windows, affecting the driver's view through the rearview mirror and passenger comfort.

Description

Technical Field

[0001] This invention relates to the field of automotive intelligent control technology, specifically to a control method, system, electronic device, and vehicle for preventing window fogging. Background Technology

[0002] With the development of the automotive industry, window defrosting has become an increasingly important aspect of driving safety. In spring, autumn, and winter, due to the high temperature difference between the inside and outside of the vehicle and the high humidity inside, windows easily fog up, obstructing the driver's view and greatly jeopardizing driving safety. Currently, most automatic defrosting functions rely on temperature and humidity sensors located near the rearview mirror above the windshield to determine the level of fogging inside the vehicle.

[0003] Especially during winter driving, when the outside temperature is low and the car's heating is on, the interior is prone to fogging. However, due to the current placement of temperature and humidity sensors, if the windshield is exposed to sunlight, the sensor will register a higher glass temperature, causing a decrease in relative humidity near the windshield. This leads to a calculation that doesn't reflect the actual low risk of fogging. In spring and autumn, when the air conditioning is off and the temperature difference between the inside and outside of the car is small, the driver and passengers are closer to the side windows. The accumulated humidity from breathing and body heat is more noticeable on the side windows, causing them to fog up before the windshield. Fogging side windows obstruct the driver's view through the rearview mirror, increasing the risk of accidents.

[0004] With the development and progress of the automotive industry, the window defroster function, as an important feature to ensure driving safety, has received increasing attention. In spring, autumn, and winter, due to the significant temperature difference between the inside and outside of the car and the high humidity inside the car, windows often fog up, which can seriously interfere with the driver's vision and thus threaten driving safety.

[0005] Currently, most vehicles are equipped with automatic defogging systems that rely on temperature and humidity sensors installed near the rearview mirror above the windshield to monitor for fogging inside the vehicle. Once fogging is detected, the system automatically activates the defogging function. For example, CN114274736A discloses an automotive air conditioning anti-fogging control method, device, equipment, and storage medium. This method includes: determining the dew point temperature based on the air temperature and humidity near the windshield; judging whether there is a risk of fogging based on the windshield surface temperature and dew point temperature; if so, determining the fogging risk change rate based on the glass surface temperature and dew point temperature; and determining different anti-fogging programs based on the fogging risk change rate and the difference between the glass surface temperature and the dew point temperature. The anti-fogging program controls the airflow mode, air volume, and airflow temperature. By determining the fogging risk based on the glass surface temperature, air temperature, and humidity near the windshield, and automatically adjusting the air conditioning anti-fogging program according to the dew point temperature change trend, this method avoids the abrupt start / stop problems of existing automatic anti-fogging methods, providing drivers with a better and safer driving experience.

[0006] However, fogging inside the car is particularly common in winter when the outside temperature is low and the air conditioning is on. Due to the current placement of temperature and humidity sensors, when sunlight shines directly on the windshield, the sensors may incorrectly detect higher glass temperatures and lower relative humidity, leading to an inaccurate conclusion that the risk of fogging inside the car is low. Furthermore, in spring and autumn, even with the air conditioning off and little temperature difference between the inside and outside of the car, the humidity buildup from the driver and passengers breathing near the side windows, along with body heat, makes fogging on the side windows more likely to occur earlier than on the windshield. Fogging on the side windows can impair the driver's vision through the rearview mirror, potentially causing traffic accidents. Therefore, there is an urgent need for a solution that can employ different recognition strategies for windshield and side window fogging to ensure accurate identification of fogging conditions across various driving environments. Summary of the Invention

[0007] In view of this, the purpose of the present invention is to provide a control method, system, electronic device and vehicle for preventing fogging of vehicle windows, so as to solve the problem that existing vehicles rely solely on the glass surface temperature and dew point temperature collected by the windshield temperature and humidity sensor to determine whether there is a risk of fogging inside the vehicle, which has large errors. It can also solve the problem that the side windows cannot be defogging in time, which affects the driver's vision through the rearview mirror and the ride comfort.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0009] A method for preventing car windows from fogging up includes the following steps:

[0010] S1. When the vehicle's defrosting function is not turned on, determine the probability of fogging of the side windows based on the temperature and dew point temperature of the side windows; determine the probability of fogging of the windshield based on the temperature and dew point temperature of the windshield.

[0011] S2. When the smaller of the probability of fogging on the side windows and the probability of fogging on the windshield is greater than or equal to the preset fogging probability, the defogging function is activated.

[0012] Based on the aforementioned technical methods, the probability of fogging inside the vehicle is comprehensively assessed by combining the probability of fogging on the side windows and the windshield, thereby preventing window fogging. This ensures a comprehensive and accurate assessment of the probability of window fogging, and by promptly activating the defroster, it prevents obstructed vision caused by window fogging, reduces traffic accidents, and improves driving safety and comfort. It effectively solves the problem of large errors in existing vehicle systems that rely solely on the surface temperature and dew point temperature of the windshield temperature and humidity sensor to determine the risk of fogging inside the vehicle. At the same time, it also overcomes the difficulty of timely defogging of the side windows, thus avoiding affecting the driver's vision through the rearview mirror and the passenger's comfort experience.

[0013] Preferably, determining the probability of fogging of the side window glass based on the side window glass temperature and the side window glass dew point temperature includes:

[0014] Obtain the side window temperature and side window dew point temperature of the vehicle;

[0015] Determine the side window temperature difference, which is equal to the vehicle's side window temperature T. g With the dew point temperature T of the side window glass dp The difference between

[0016] Based on the temperature difference of the side window glass, the relationship between the side window glass temperature difference and the probability of fogging F can be determined. g The correspondence table yields the probability F of fogging on the side window glass. g .

[0017] Preferably, the side window glass temperature T g It is calculated using the temperature inside the vehicle and the ambient temperature outside the vehicle.

[0018] Preferably, the dew point temperature T of the side window glass dp It is calculated using the vehicle's interior temperature and relative humidity.

[0019] Since existing vehicles do not have side window temperature and humidity sensors, it is impossible to directly obtain the side window temperature and dew point temperature. Therefore, by combining the vehicle interior temperature and the outside ambient temperature to calculate the side window temperature, and by combining the vehicle interior temperature and the vehicle interior relative humidity to calculate the side window dew point temperature, the anti-fogging function of the side window glass can be effectively achieved without adding vehicle parts. This is especially suitable for vehicles that do not have side window temperature and humidity sensors installed.

[0020] Preferably, the side window glass temperature T g The calculation formula is as follows:

[0021]

[0022] In formula I, T Amb This indicates the initial ambient temperature outside the vehicle, in °C; T i This indicates the real-time temperature inside the vehicle, measured in °C; T o The outside ambient temperature is measured in real time (°C); t is the cumulative time from the start of power-on calculation by the thermal management controller to the current moment (s); T g This indicates the temperature of the side window glass, in °C; k a Indicates coefficient;

[0023] k a The calculation formula is:

[0024] In Equation II, A c This indicates the heat exchange area, which in this case is the area of ​​the side window glass, in square meters (m²). 2 h c This represents the convective heat transfer coefficient, with units of W / (m²). 2 ·K), h c For physical property parameters; k c The parameters represent heat transfer parameters; c represents the specific heat capacity of the side window glass, in J / kg·K; m represents the mass of the side window glass, in kg; k is obtained after simplified calculation based on the above parameters. a This is used to represent the coefficients (not unitless proportional values) remaining after extracting the variables of interior and exterior temperature and time, which are related to the physical properties of the materials involved in the heat exchange process, thus simplifying the formula for calculating the side window glass temperature.

[0025] Because the in-vehicle temperature acquisition module is typically located near the driver's feet or center console in actual vehicles, there is a spatial difference between this location and the air temperature near the side window glass, which needs to be observed to calculate the side window dew point temperature. When the air conditioning is on for heating in spring / autumn or winter, this can lead to a discrepancy in the temperature values ​​between the two points. Therefore, the value of is obtained by adding a compensation value that changes with a positive correlation to the in-vehicle temperature. The more the air conditioning is on for heating, the greater the change in in-vehicle temperature, and the greater the temperature difference between the two points.

[0026] Preferably, the dew point temperature T of the side window glass dp The calculation formula is as follows:

[0027]

[0028] In Equation III, T p This indicates the interior temperature near the side window, in °C (°C); RH p This indicates the relative humidity inside the vehicle near the side window, expressed in % (°C). dp This indicates the dew point temperature of the side window glass, in °C; γ(RH) p , H p) is for the key variable T in the calculation formula p and RH p The simplified process expression after extraction; a and b represent the changes in time with T p Changes in adjustment parameters;

[0029] The values ​​of parameters a and b are adjusted as follows:

[0030]

[0031] Because the relative humidity sensor in actual vehicles is typically positioned above the rearview mirror on the windshield, while the humidity generated by human respiration accumulates primarily near the side windows, the readings from the sensor differ from those from the actual humidity readings. Furthermore, the humidity generated by human respiration diffuses within the vehicle, slowing down the accumulation of humidity on the side windows. Therefore, RH... p The value is obtained by adding a gain compensation value that changes positively with the interior space and a loss compensation value that changes positively with the number of people in the vehicle to the relative humidity near the windshield. By setting the compensation value, the spatial differences caused by the placement of the interior temperature and humidity acquisition modules are compensated for.

[0032] Preferably, the interior temperature T near the side window glass is... p Equal to the real-time collected vehicle interior temperature T i and temperature compensation value T err The sum; the temperature compensation value T err By checking the temperature compensation value T err The relationship between the vehicle's interior and exterior temperature differences is obtained from a table, where the vehicle's interior temperature T is equal to the real-time collected interior temperature. i With real-time collected vehicle exterior ambient temperature T o difference.

[0033] Preferably, the relative humidity (RH) inside the vehicle near the side window glass is... p Equal to the relative humidity near the windshield and the gain compensation value RH u and loss compensation value RH d The sum; the gain compensation value RH u By checking the gain compensation value RH u The table showing the correspondence between the vehicle interior space volume and the loss compensation value RH is obtained. d By checking the loss compensation value RH d The table showing the correspondence between the number of people in the vehicle and the number of passengers inside was obtained.

[0034] Preferably, determining the probability of windshield fogging based on the vehicle's windshield temperature and windshield dew point temperature includes:

[0035] Obtain the vehicle's windshield temperature and windshield dew point temperature;

[0036] Determine the windshield temperature difference, which is equal to the difference between the windshield temperature and the windshield dew point temperature.

[0037] Based on the windshield temperature difference, the relationship between the windshield temperature difference and the windshield fogging probability Q is determined. g The correspondence table yields the probability Q of the windshield fogging. g .

[0038] Preferably, the windshield temperature, windshield dew point temperature, and relative humidity near the windshield are all obtained by sensors.

[0039] Preferably, the windshield temperature, windshield dew point temperature, and relative humidity near the windshield are all obtained by a light and rain sensor.

[0040] Preferably, step S2 specifically involves: when the smaller of the probability of fogging on the side windows and the probability of fogging on the windshield is greater than or equal to the preset fogging probability and the vehicle's air conditioning is on, activating the defogging function; adjusting the damper position based on the current damper position and the damper compensation position; adjusting the airflow voltage based on the current airflow voltage and the compensation voltage; adjusting the internal and external circulation damper positions based on the current internal and external circulation damper positions and the internal and external circulation damper compensation positions; determining whether the current air conditioning demand is cooling; if so, sending a compressor speed request to the compressor; otherwise, sending a PTC power request to the PCT.

[0041] When the smaller of the probability of fogging on the side windows and the probability of fogging on the windshield is greater than or equal to the preset fogging probability and the vehicle's air conditioning is off, the defrosting function is activated. The air damper position is adjusted according to the current air damper position and the air damper compensation position; the air volume voltage is adjusted according to the current air volume voltage and the compensation voltage; the internal and external circulation air damper positions are adjusted according to the current internal and external circulation air damper positions and the internal and external circulation air damper compensation positions; it is determined whether the current air conditioning demand is cooling. If so, a compressor speed request is sent to the compressor; otherwise, a PTC power request is sent to the PCT.

[0042] When the air conditioning is turned on, the system precisely adjusts its operation based on the current damper position, airflow voltage, and internal / external circulation damper positions, combined with compensation values, ensuring optimal performance. By identifying whether the air conditioning is currently in cooling or heating mode and sending corresponding requests to the compressor or PTC, the system's adaptability and flexibility are improved. Intelligent defogging and air conditioning control allow the system to quickly respond to and meet the driver's needs, reducing the hassle of manual operation and enhancing driving convenience and comfort. Precise control of the air conditioning system avoids unnecessary energy consumption, helping to reduce vehicle fuel consumption and emissions, aligning with the modern automotive trend towards energy conservation and environmental protection.

[0043] When the air conditioning is off, the system precisely adjusts the damper to its optimal position based on the current damper position and the damper compensation position to ensure effective defogging. Simultaneously, it finely adjusts the airflow voltage based on the current airflow voltage and compensation voltage to achieve ideal airflow intensity. This refined adjustment ensures that the defogging process is both efficient and energy-saving. The system intelligently adjusts the positions of the internal and external circulation dampers based on their current and compensation positions. During defogging, the system can flexibly switch between internal and external circulation as needed to ensure the best balance between air circulation and defogging effectiveness. It accurately determines whether the current air conditioning demand is cooling and sends corresponding speed or power requests to the compressor or PTC accordingly. This intelligent response mechanism ensures that the air conditioning system meets defogging needs while maintaining comfortable cabin temperature during the defogging process. In summary, the control strategy excels in intelligent judgment and response, refined damper and airflow adjustment, intelligent switching between internal and external circulation, and intelligent response to cooling and heating demands, providing drivers with a safer, more comfortable, and more efficient driving experience.

[0044] The present invention also provides a system for implementing the control method for preventing window fogging described herein, comprising:

[0045] The temperature detection module is used to detect the temperature of the vehicle's side windows and windshield.

[0046] The dew point temperature calculation module is used to calculate the dew point temperature of the side window glass and the dew point temperature of the windshield based on the side window glass temperature and the windshield temperature.

[0047] The probability determination module is used to determine the probability of fogging of the side window glass based on the side window glass temperature and the side window glass dew point temperature, and to determine the probability of fogging of the windshield glass based on the windshield glass temperature and the windshield dew point temperature.

[0048] The control module is used to activate the defogging function when the smaller of the probability of fogging on the side windows and the probability of fogging on the windshield is greater than or equal to the preset fogging probability.

[0049] Preferably, the system further includes:

[0050] An ambient temperature sensor is used to collect the ambient temperature outside the vehicle.

[0051] In-vehicle temperature sensor, used to collect the temperature inside the vehicle;

[0052] A light-rain sensor is used to collect data on the windshield temperature, windshield relative humidity, and relative humidity near the windshield.

[0053] The thermal management controller connects to an ambient temperature sensor, an in-vehicle temperature sensor, and a light and rain sensor. It receives data from the sensors on the outside ambient temperature, the inside temperature, the windshield temperature, and the relative humidity of the windshield, and calculates and determines the probability of fogging on the side windows and the windshield.

[0054] Vehicle infotainment system controller, used for human-machine interaction.

[0055] The present invention also provides an electronic device, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the steps of the control method for preventing window fogging as described in the present invention.

[0056] The present invention also provides a vehicle that includes the electronic equipment described in the present invention.

[0057] The beneficial effects of this invention are:

[0058] The present invention provides a control method for preventing vehicle window fogging. By combining the probability of fogging on the side windows and the probability of fogging on the windshield, it comprehensively assesses the likelihood of fogging inside the vehicle, thereby preventing window fogging. This ensures a comprehensive and accurate assessment of the probability of window fogging, and by promptly activating the defroster, it prevents obstructed vision caused by window fogging, reduces traffic accidents, and improves driving safety and comfort. It effectively solves the problem of large errors in existing vehicle systems that rely solely on the surface temperature and dew point temperature of the windshield collected by a temperature and humidity sensor to determine the risk of fogging inside the vehicle. It also overcomes the difficulty of timely defogging of the side windows, thus avoiding affecting the driver's view through the rearview mirror and the passenger's comfort experience. This method has significant application value in the field of automotive intelligent control technology. Attached Figure Description

[0059] Figure 1 A flowchart illustrating a control method for preventing car windows from fogging up;

[0060] Figure 2 This is a schematic diagram of the first structure of the control system;

[0061] Figure 3 This is a schematic diagram of the second structure of the control system. Detailed Implementation

[0062] The embodiments of the present invention will be described below with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention and not for limiting the scope of protection of the present invention.

[0063] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0064] Numerous details are explored in the following description to provide a more thorough explanation of embodiments of this application; however, it will be apparent to those skilled in the art that embodiments of this application may be implemented without these specific details.

[0065] This invention aims to disclose an automatic control method, system, electronic device, and vehicle for the air conditioning circulation mode of an automobile, in order to solve the problem of tunnel air entering the vehicle and affecting the comfort of the driver and passengers, as well as the safety issues of manually switching the air conditioning circulation mode. It can also solve the problems of low accuracy and stability of existing control methods for the air conditioning circulation mode of vehicles entering tunnels, and the problem that the control strategy is too simple and may not be suitable for all tunnel environments.

[0066] like Figure 1 As shown, a method for preventing car windows from fogging includes the following steps:

[0067] S1. When the vehicle's defrosting function is not turned on, determine the probability of fogging of the side windows based on the temperature and dew point temperature of the side windows; determine the probability of fogging of the windshield based on the temperature and dew point temperature of the windshield.

[0068] S2. When the smaller of the probability of fogging on the side windows and the probability of fogging on the windshield is greater than or equal to the preset fogging probability, the defogging function is activated and the information is sent to the vehicle's infotainment system for display.

[0069] By combining the probability of fogging on the side windows and the windshield, the likelihood of fogging inside the vehicle is comprehensively assessed, thereby preventing window fogging. This ensures a comprehensive and accurate assessment of the probability of window fogging, and by promptly activating the defroster, it prevents obstructed vision caused by fogged windows, reduces traffic accidents, and improves driving safety and comfort. It effectively solves the problem of large errors in existing vehicle systems that rely solely on the surface temperature and dew point temperature of the windshield temperature and humidity sensor to determine the risk of fogging inside the vehicle. At the same time, it also overcomes the difficulty of timely defogging of the side windows, thus avoiding affecting the driver's view through the rearview mirror and the passenger's comfort experience.

[0070] In some embodiments, determining the probability of fogging of the side window glass based on the side window glass temperature and the side window glass dew point temperature includes:

[0071] Obtain the side window temperature and side window dew point temperature of the vehicle;

[0072] Determine the side window temperature difference, which is equal to the vehicle's side window temperature T. g With the dew point temperature T of the side window glass dp The difference between

[0073] Based on the temperature difference of the side window glass, the relationship between the side window glass temperature difference and the probability of fogging F can be determined. g The correspondence table yields the probability F of fogging on the side window glass. g ;

[0074] The relationship between the temperature difference of the side window glass and the probability of fogging of the side window glass was obtained through experimental calibration and calculation.

[0075] Among them, the probability of fogging of the side window glass is related to the side window glass temperature T. g With the dew point temperature T of the side window glass dp The differences are negatively correlated.

[0076] In this embodiment, the relationship between the side window temperature difference and the probability of side window fogging is shown in Table 1 for a certain research object vehicle model.

[0077] Table 2 shows the relationship between the temperature difference of the side window glass and the probability of fogging of the side window glass.

[0078] <![CDATA[T g -T dp ]]> 0 0.7 1.4 2 2.5 3 <![CDATA[F g ]]> 100 90 80 65 55 40

[0079] In some embodiments, in order to successfully control the anti-fogging of the side window glass without adding vehicle hardware, the side window glass temperature T is... g The dew point temperature of the side window glass, T, is calculated using the interior temperature and the ambient temperature outside the vehicle. dp It is calculated using the vehicle's interior temperature and relative humidity.

[0080] The side window glass temperature T was derived and verified through experiments. g The calculation formula is as follows:

[0081]

[0082] In formula I, T Amb This indicates the initial ambient temperature outside the vehicle, in °C; T i This indicates the real-time temperature inside the vehicle, measured in °C; T o The outside ambient temperature is measured in real time (°C); t is the cumulative time from the start of power-on calculation by the thermal management controller to the current moment (s); k a T represents the coefficient; g This indicates the temperature of the side window glass, in °C.

[0083] k a The calculation formula is:

[0084] In Equation II, A c This indicates the heat exchange area, which in this case is the area of ​​the side window glass, in square meters (m²). 2 h c This represents the convective heat transfer coefficient, with units of W / (m²). 2 ·K), h c The value of k ranges from 5.5 to 8.0; c The values ​​represent heat transfer parameters; c represents the specific heat capacity of the side window glass, in J / kg·K; m represents the mass of the side window glass, in kg; k a Represents the coefficient.

[0085] In this embodiment, calculations are performed for a specific vehicle model, A. c The value is 0.375; h c The value is 6.5; h c The value is 6.5; k c The value is 0.8; c is 0.837; m is 4.688.

[0086] Among them, k a This indicates that, in addition to the real-time collected vehicle interior temperature T, i Real-time collected ambient temperature T outside the vehicle o In addition to the three key variables of cumulative time t, other coefficients, k a Derived from the heat balance formula; the heat balance calculation formula is as follows:

[0087]

[0088] Among them, Q c Q represents the amount of heat exchanged when there is a temperature difference between the two sides of a side window, expressed in kJ.g Q represents the heat absorbed by the side window glass during the heat exchange process, expressed in kJ. This application ignores minor heat-related factors such as human body heat dissipation, interior heat absorption, and electrical appliance heat dissipation. c and Q g Treating them as equal, the side window glass temperature at which dynamic thermal equilibrium is reached is calculated.

[0089] parameter h c and k c With T i -T o They are positively correlated.

[0090] In some embodiments, the dew point temperature T of the side window glass dp The calculation formula is as follows:

[0091]

[0092] In Equation III, T p This indicates the interior temperature near the side window, in °C (°C); RH p This indicates the relative humidity inside the vehicle near the side window, expressed in % (°C). dp This indicates the dew point temperature of the side window glass, in °C; γ(RH) p , H p ) represents the simplified process expression after extracting key variables from the calculation formula; a and b represent the changes in T. p Changes in adjustment parameters;

[0093] The values ​​of parameters a and b are adjusted as follows:

[0094]

[0095] In some embodiments, the interior temperature T near the side window glass p Equal to the real-time collected vehicle interior temperature T i and temperature compensation value T err The sum; temperature compensation value T err By checking the temperature compensation value T err The table showing the correspondence between the vehicle's interior and exterior temperature differences is used to determine that the interior temperature T is equal to the real-time collected interior temperature. i With real-time collected vehicle exterior ambient temperature T o difference.

[0096] In this embodiment, the temperature compensation value T is specific to a particular vehicle model. err The correspondence between the temperature difference inside and outside the vehicle and the temperature difference is shown in Table 2. The correspondence table was obtained through experimental calibration.

[0097] Table 2 shows the relationship between temperature compensation values ​​and the temperature difference between the inside and outside of the vehicle.

[0098] <![CDATA[T i -T o ]]> 0 8 11 15 25 30 <![CDATA[T err ]]> 0 -0.3 -1 -3 -3.5 -4

[0099] The compensation value is positively correlated with the difference between the temperature inside the vehicle and the ambient temperature outside the vehicle.

[0100] In some embodiments, the relative humidity (RH) inside the vehicle near the side window glass p Equal to the relative humidity near the windshield and the gain compensation value RH u and loss compensation value RH d The sum; gain compensation value RH u By checking the gain compensation value RH u Obtained from the table corresponding to the vehicle interior space volume; Loss compensation value RH d By checking the loss compensation value RH d Obtained from the table corresponding to the number of people inside the vehicle. Gain compensation value RH u Table of correspondence between vehicle interior space volume and loss compensation value RH d The tables showing the correspondence between the number of people inside the vehicle were all obtained through experimental calibration.

[0101] In this embodiment, the loss compensation value RH is used for a specific vehicle model under study. d The correspondence between the number of people N in the vehicle and the number of passengers N is shown in Table 3.

[0102] Table 3 shows the loss compensation value RH. d Table of Correspondence between Number of People N in the Vehicle

[0103] N 0 1 2 3 4 5 <![CDATA[RH d ]]> 0 5 6 7 8.6 9

[0104] In some embodiments, determining the probability of windshield fogging based on the vehicle's windshield temperature and windshield dew point temperature includes:

[0105] Obtain the vehicle's windshield temperature and windshield dew point temperature;

[0106] Determine the windshield temperature difference, which is equal to the difference between the vehicle's windshield temperature and the windshield dew point temperature.

[0107] The probability of windshield fogging is obtained by referring to a table showing the correlation between windshield temperature difference and windshield fogging probability. This table was obtained through experimental calibration.

[0108] The windshield temperature, windshield dew point temperature, and relative humidity near the windshield were all collected using a light and rain sensor.

[0109] The probability of windshield fogging is negatively correlated with the difference between windshield temperature and windshield dew point temperature.

[0110] In some embodiments, S2 specifically involves: when the smaller of the probability of fogging on the side windows and the probability of fogging on the windshield is greater than or equal to the preset fogging probability and the vehicle's air conditioning is on, the defogging function is activated; the damper position is adjusted according to the current damper position and the damper compensation position; the air volume voltage is adjusted according to the current air volume voltage and the compensation voltage; the internal and external circulation damper positions are adjusted according to the current internal and external circulation damper positions and the internal and external circulation damper compensation positions; it is determined whether the current air conditioning demand is cooling, and if so, a compressor speed request is sent to the compressor, otherwise, a PTC power request is sent to the PTC.

[0111] When the smaller of the probability of fogging on the side windows and the probability of fogging on the windshield is greater than or equal to the preset fogging probability and the vehicle's air conditioning is off, the defrosting function is activated. The air damper position is adjusted according to the current air damper position and the air damper compensation position; the air volume voltage is adjusted according to the current air volume voltage and the compensation voltage; the internal and external circulation air damper positions are adjusted according to the current internal and external circulation air damper positions and the internal and external circulation air damper compensation positions; it is determined whether the current air conditioning demand is cooling. If so, a compressor speed request is sent to the compressor; otherwise, a PTC power request is sent to the PTC.

[0112] The damper compensation position was obtained by referring to the correspondence table between fogging probability and damper compensation position; the compensation voltage was obtained by referring to the correspondence table between fogging probability and compensation voltage; and the internal / external circulation damper compensation position was obtained by referring to the correspondence table between fogging probability and internal / external circulation damper compensation position. All three tables—the damper compensation position, the compensation voltage, and the internal / external circulation damper compensation position—were obtained through experimental calibration.

[0113] Among them, the fogging probability used for the table lookup damper compensation position is the smaller value between the fogging probability of the side window glass and the fogging probability of the windshield.

[0114] When defogging is required, it is achieved by controlling the air outlet mode damper, the circulation damper, the blower, and the PTC heater or compressor.

[0115] When the defogging function needs to be activated, if the air conditioner is on, the air outlet mode damper and blower will be compensated based on the current air conditioner status. The higher the probability of fogging, the closer the air outlet mode damper is to the window blowing position, and the greater the blower air volume. If the air conditioner is off, the blower air volume will gradually increase from level one to level three as the probability of fogging increases, the circulation mode damper will move to external circulation, and the air outlet mode damper will move to the window blowing position.

[0116] In some embodiments, such as Figure 2 As shown, a system for implementing the control method for preventing window fogging in any of the above embodiments is also provided, comprising:

[0117] The temperature detection module is used to detect the temperature of the vehicle's side windows and windshield.

[0118] The dew point temperature calculation module is used to calculate the dew point temperature of the side window glass and the dew point temperature of the windshield based on the side window glass temperature and the windshield temperature.

[0119] The probability determination module is used to determine the probability of fogging of the side window glass based on the side window glass temperature and the side window glass dew point temperature, and to determine the probability of fogging of the windshield glass based on the windshield glass temperature and the windshield dew point temperature.

[0120] The control module is used to activate the defogging function when the smaller of the probability of fogging on the side windows and the probability of fogging on the windshield is greater than or equal to the preset fogging probability.

[0121] In some embodiments, as Figure 3 As shown, the system also includes:

[0122] An ambient temperature sensor is used to collect the ambient temperature outside the vehicle and transmit the collected ambient temperature to the thermal management controller.

[0123] The vehicle interior temperature sensor is used to collect the vehicle interior temperature and transmit the collected temperature to the thermal management controller.

[0124] The light and rain sensor is used to collect the windshield temperature, windshield relative humidity and the relative humidity near the windshield, and transmit the collected windshield temperature, windshield relative humidity and the relative humidity near the windshield to the thermal management controller.

[0125] The thermal management controller connects to an ambient temperature sensor, an in-vehicle temperature sensor, and a light and rain sensor. It receives data from these sensors on the outside ambient temperature, the inside temperature, the windshield temperature, and the relative humidity of the windshield, and calculates the probability of fogging on the side windows and the windshield. Simultaneously, it receives information from the vehicle's infotainment system controller regarding the defogging function's on / off status and the air conditioning status to determine the subsequent actions the defogging system should take.

[0126] Vehicle infotainment system controller, used for human-machine interaction.

[0127] For example, the system also includes: a communication network between controllers, a PTC (heater), a compressor, an air outlet mode damper actuator, an internal / external circulation damper actuator, a blower, a vehicle display screen, and an HVAC air conditioning unit.

[0128] The vehicle infotainment controller is used to display the air conditioning button information, air volume, circulation and mode, determine the air conditioning on / off status and the defogging function on / off status, and transmit the information to the thermal management controller. At the same time, the vehicle infotainment controller receives the air volume, air outlet mode and circulation status feedback from the thermal management controller and displays the air conditioning status on the vehicle infotainment screen.

[0129] An HVAC unit contains an air outlet mode damper actuator, an internal / external circulation damper actuator, and a blower. The function of an HVAC unit is to regulate the air conditioning output, such as airflow, temperature, and direction.

[0130] The air outlet mode damper actuator is a device that can change the air outlet direction of the air conditioning unit.

[0131] The internal and external circulation damper actuator is a device that can change the air intake source of the air conditioning unit.

[0132] A blower is a device that can change the amount of airflow from an air conditioning unit.

[0133] A PTC (heater) is a device that provides a heating source for the crew compartment.

[0134] A compressor is a device that provides a cooling source for the crew compartment.

[0135] Communication networks between controllers are a medium or mechanism for transmitting signals between controllers, such as CAN bus or CANFD bus.

[0136] The purpose of the vehicle's infotainment display screen is to receive air conditioning information from user operations, display the current status of the air conditioning, and enable human-machine interaction.

[0137] In some embodiments, an electronic device is also provided, including a memory and a processor, the memory storing a computer program, the processor executing the computer program to implement the steps of the control method for preventing window fogging as described in any of the above embodiments.

[0138] In some embodiments, a vehicle including the electronic devices of any of the above embodiments is also provided.

[0139] In summary, the control method for preventing window fogging of the present invention comprehensively assesses the possibility of fogging inside the vehicle by combining the probability of fogging on the side windows and the probability of fogging on the windshield, thereby preventing window fogging. This ensures a comprehensive and accurate assessment of the probability of window fogging, and by promptly activating the defroster, it prevents obstructed vision caused by window fogging, reduces traffic accidents, and improves driving safety and comfort. It effectively solves the problem of large errors in existing vehicle systems that rely solely on the surface temperature and dew point temperature of the windshield collected by a temperature and humidity sensor to determine the risk of fogging inside the vehicle. It also overcomes the difficulty of timely defogging of the side windows, thus avoiding affecting the driver's view through the rearview mirror and the passenger's comfort experience. This method has significant application value in the field of automotive intelligent control technology.

[0140] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit this application. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this application. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this application should still be covered by the claims of this application.

Claims

1. A control method for preventing car window fogging, characterized in that, Includes the following steps: S1. When the vehicle's defrosting function is not turned on, determine the probability of fogging of the side windows based on the temperature and dew point temperature of the side windows; determine the probability of fogging of the windshield based on the temperature and dew point temperature of the windshield. S2. When the smaller of the probability of fogging on the side windows and the probability of fogging on the windshield is greater than or equal to the preset fogging probability, the defogging function is activated. The temperature of the side window glass The calculation formula is as follows: （ ） In formula I, This indicates the initial ambient temperature outside the vehicle, in °C. This indicates the real-time temperature inside the vehicle, in °C. The outside ambient temperature is measured in real time (°C); t is the cumulative time from the start of power-on calculation by the thermal management controller to the current moment (s). This indicates the temperature of the side window glass, in °C. Indicates coefficient; The calculation formula is: ( ) In formula II, This indicates the area of ​​the side window glass, in square meters (m²). 2 ; This represents the convective heat transfer coefficient, with units of W / (m²). 2 ·K); The values ​​represent heat transfer parameters; c represents the specific heat capacity of the side window glass, in J / kg·K; m represents the mass of the side window glass, in kg. And / or, the dew point temperature of the side window glass The calculation formula is as follows: （ ） In Equation III, This indicates the interior temperature near the side window, in °C. This indicates the relative humidity inside the car near the side window, expressed in % %. This indicates the dew point temperature of the side window glass, in °C; a and b represent adjustment parameters. The values ​​of parameters a and b are adjusted as follows: （ ）。 2. The control method for preventing car window fogging according to claim 1, characterized in that, The method of determining the probability of fogging of the side window glass based on the side window glass temperature and the dew point temperature of the side window glass includes: Obtain the side window temperature and side window dew point temperature of the vehicle; Determine the side window temperature difference, which is equal to the vehicle's side window temperature. Dew point temperature of side window glass The difference; Based on the temperature difference of the side window glass, the relationship between the side window glass temperature difference and the probability of fogging can be determined. The correspondence table yields the probability of fogging on the side windows. ; And / or, determining the probability of windshield fogging based on the vehicle's windshield temperature and windshield dew point temperature includes: Obtain the vehicle's windshield temperature and windshield dew point temperature; Determine the windshield temperature difference, which is equal to the difference between the windshield temperature and the windshield dew point temperature. Based on the windshield temperature difference, check the correlation between windshield temperature difference and the probability of windshield fogging. The correspondence table yields the probability of fogging on the front windshield. .

3. The control method for preventing car window fogging according to claim 2, characterized in that, The temperature of the side window glass Calculated using the temperature inside the vehicle and the ambient temperature outside the vehicle; And / or, the dew point temperature of the side window glass Calculated using the vehicle interior temperature and relative humidity; And / or, the windshield temperature and windshield dew point temperature are obtained by sensors.

4. The control method for preventing car window fogging according to claim 3, characterized in that, The interior temperature near the side window glass Equivalent to real-time collected vehicle interior temperature and temperature compensation value The sum; the temperature compensation value By checking the temperature compensation value The relationship between the vehicle's interior and exterior temperature differences is obtained from a table, where the vehicle's interior temperature difference is equal to the real-time collected interior temperature. With real-time collected external ambient temperature difference; And / or, the relative humidity inside the vehicle near the side window glass. Equal to the relative humidity near the windshield and the gain compensation value and loss compensation value The sum; the gain compensation value By checking the gain compensation value The corresponding table of vehicle interior space volume is obtained; the reduction compensation value is obtained. By checking the loss compensation value The table showing the correspondence between the number of people in the vehicle and the number of passengers inside was obtained.

5. The control method for preventing car window fogging according to claim 1, characterized in that, Specifically, S2 is: When the smaller of the probability of fogging on the side windows and the probability of fogging on the windshield is greater than or equal to the preset fogging probability and the vehicle's air conditioning is on, the defogging function is activated, and the damper position is adjusted according to the current damper position and the damper compensation position; the air volume voltage is adjusted according to the current air volume voltage and the compensation voltage. Adjust the positions of the internal and external circulation dampers according to the current positions of the internal and external circulation dampers and their compensation positions. Determine if the current demand of the air conditioner is cooling. If so, send the compressor speed request to the compressor. Otherwise, send the PTC power request to the PCT. When the smaller of the probability of fogging on the side windows and the probability of fogging on the windshield is greater than or equal to the preset fogging probability and the vehicle's air conditioning is off, the defogging function is activated, and the damper position is adjusted according to the current damper position and the damper compensation position; the air volume voltage is adjusted according to the current air volume voltage and the compensation voltage. Adjust the positions of the internal and external circulation dampers according to the current positions of the internal and external circulation dampers and their compensation positions. Determine if the current demand of the air conditioner is cooling. If so, send a compressor speed request to the compressor; otherwise, send a PTC power request to the PCT.

6. A system for implementing the control method for preventing window fogging as described in any one of claims 1 to 5, characterized in that, include: The temperature detection module is used to detect the temperature of the vehicle's side windows and windshield. The dew point temperature calculation module is used to calculate the dew point temperature of the side window glass and the dew point temperature of the windshield based on the side window glass temperature and the windshield temperature. The probability determination module is used to determine the probability of fogging of the side window glass based on the side window glass temperature and the side window glass dew point temperature, and to determine the probability of fogging of the windshield glass based on the windshield glass temperature and the windshield dew point temperature. The control module is used to activate the defogging function when the smaller of the probability of fogging on the side windows and the probability of fogging on the windshield is greater than or equal to the preset fogging probability.

7. The system according to claim 6, characterized in that, Also includes: An ambient temperature sensor is used to collect the ambient temperature outside the vehicle. In-vehicle temperature sensor, used to collect the temperature inside the vehicle; A light-rain sensor is used to collect data on the windshield temperature, windshield relative humidity, and relative humidity near the windshield. The thermal management controller connects to an ambient temperature sensor, an in-vehicle temperature sensor, and a light and rain sensor. It receives data from the sensors on the outside ambient temperature, the inside temperature, the windshield temperature, and the relative humidity of the windshield, and calculates and determines the probability of fogging on the side windows and the windshield. Vehicle infotainment system controller, used for human-machine interaction.

8. An electronic device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the control method for preventing window fogging as described in any one of claims 1 to 5.

9. A vehicle, characterized in that, The vehicle includes the electronic equipment as described in claim 8.

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