Control method and system for preventing vehicle window fogging, electronic equipment and vehicle

Abstract

The invention relates to a control method and system for preventing a vehicle window from fogging, electronic equipment and a vehicle. The control method comprises the steps that when the demisting function of the vehicle is not started, the side window glass fogging probability is determined according to the side window glass temperature and the side window glass dew point temperature of the vehicle; according to the front windshield temperature and the front windshield dew point temperature of the vehicle, the fogging probability of the front windshield is determined; when the smaller value of the fogging probability of the side window glass and the fogging probability of the front windshield is larger than or equal to the preset fogging probability, the defogging function is started. The invention further provides a control system for preventing the vehicle window from fogging. The invention further provides electronic equipment and a vehicle. The problem that errors are large due to the fact that an existing vehicle judges whether the fogging risk exists in the vehicle only through the glass surface temperature and the dew point temperature collected by a front windshield temperature and humidity sensor is solved, and the problem that the sight of a driver passing through a rearview mirror and the riding comfort are affected due to the fact that defogging of a side window cannot be achieved in time is solved.

Description

Technical Field

[0001] The present invention relates to the field of automobile intelligent control technology, and in particular to a control method, system, electronic equipment and vehicle for preventing vehicle windows from fogging. Background Art

[0002] With the development of the automobile industry, window defogger has gradually become a major driving safety issue. In spring, autumn or winter, due to the high temperature difference between the inside and outside of the car and the high humidity inside the car, the windows are very likely to fog up and block the driver's vision, greatly endangering driving safety. Currently, the common automatic defogger function mainly relies on the temperature and humidity sensor near the rearview mirror above the front windshield to determine the fogging situation inside the car.

[0003] Especially when driving in winter, when the temperature outside the car is low and the air conditioner is turned on, the car is prone to fogging. However, due to the location of the existing temperature and humidity sensors, if the windshield is exposed to sunlight, the glass temperature collected by the sensor will be higher, and the relative humidity near the windshield will drop, resulting in a low-risk conclusion of fogging that is not in line with the actual situation; when driving in spring and autumn, the air conditioner is turned off, and the temperature difference between the inside and outside of the car is not large. However, since the driver and passengers are closer to the side windows, the humidity accumulation caused by breathing and the heat dissipation of the human body are more easily reflected in the side windows, causing the side windows to fog up before the windshield. When the side windows are fogged, the driver's rearview mirror field of view is affected, which can easily cause traffic accidents.

[0004] With the development and progress of the automotive industry, the window defogger function has received more and more attention as an important feature to ensure driving safety. 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, the car windows often fog up, which seriously interferes with the driver's vision and poses a threat to driving safety.

[0005] At present, the automatic defog system equipped in most vehicles mainly relies on the temperature and humidity sensor installed near the rearview mirror above the front windshield to monitor whether the car is fogged. Once fogging is detected, the system will automatically start the defog function. For example, a method, device, equipment, and storage medium for controlling the anti-fogging of automobile air conditioners disclosed in CN114274736A include: determining the dew point temperature according to the air temperature and air humidity near the windshield; judging whether there is a risk of fogging according to the glass surface temperature and dew point temperature of the windshield; if so, determining the rate of change of the risk of fogging according to the glass surface temperature and the dew point temperature; determining different anti-fogging programs according to the rate of change of the risk of fogging and the difference between the glass surface temperature and the dew point temperature, and the anti-fogging program is used to control the air outlet mode, air volume, and air outlet temperature. The risk of fogging is determined according to the glass surface temperature, the air temperature and humidity near the windshield, and the air conditioner anti-fogging program is automatically adjusted according to the change trend of the dew point temperature, thereby avoiding the abrupt start / shutdown problem existing in the existing automatic anti-fogging method and providing the driver with a good and safe driving experience.

[0006] However, in winter, when the temperature outside is low and the air conditioner is turned on, the formation of fog inside the car is particularly common. Due to the location of the existing temperature and humidity sensors, when the sun shines directly on the front windshield, the sensor may mistakenly detect a higher glass temperature and a lower relative humidity, leading to an inaccurate conclusion that the risk of fogging inside the car is low. In addition, in spring and autumn, although the air conditioner is turned off and the temperature difference between the inside and outside of the car is not large, the accumulation of humidity caused by the driver and passengers' breathing close to the side windows and the heat dissipation of the human body make it easier to form fog on the side windows, which occurs earlier than on the front windshield. Fogging of the side windows affects the driver's line of sight through the rearview mirror, which may cause traffic accidents. Therefore, there is an urgent need for a solution that can adopt different recognition strategies for the fogging of the front windshield and side windows to ensure that the fogging of the entire vehicle can be accurately identified in various vehicle use 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 vehicle windows from fogging, so as to solve the problem that existing vehicles only rely on the glass surface temperature and dew point temperature collected by the windshield temperature and humidity sensor to judge whether there is a risk of fogging in the vehicle, which results in large errors. It can also solve the problem that the side windows cannot be defogged in time, affecting the driver's vision through the rearview mirror and riding comfort.

[0008] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0009] A control method for preventing vehicle windows from fogging up comprises the following steps:

[0010] S1. When the defog function of the vehicle is not turned on, determining the fogging probability of the side window glass according to the temperature of the side window glass and the dew point temperature of the side window glass; determining the fogging probability of the front windshield according to the temperature of the front windshield glass and the dew point temperature of the front windshield;

[0011] S2. When the smaller value of the side window glass fogging probability and the front windshield glass fogging probability is greater than or equal to the preset fogging probability, the defogger function is turned on.

[0012] According to the above technical means, by combining the probability of fogging of the side window glass and the probability of fogging of the front windshield, the possibility of fogging in the car is comprehensively evaluated, thereby preventing the fogging of the car windows, ensuring the comprehensiveness and accurate evaluation of the probability of fogging of the car windows, and then by timely turning on the defogger function, unclear vision caused by fogging of the car windows is prevented, reducing the occurrence of traffic accidents, improving driving safety and comfort, and effectively solving the problem of large errors in the existing vehicle system that only relies on the glass surface temperature and dew point temperature collected by the windshield temperature and humidity sensor to judge the risk of fogging in the car. At the same time, it also overcomes the problem of not being able to defog the side windows in time, thereby avoiding affecting the driver's vision through the rearview mirror and the comfort experience of the passengers.

[0013] Preferably, determining the fogging probability of the side window glass according to the side window glass temperature of the vehicle and the side window glass dew point temperature includes:

[0014] Obtain the vehicle's side window glass temperature and side window glass dew point temperature;

[0015] Determine the side window glass temperature difference, which is equal to the side window glass temperature T of the vehicle g The side window glass dew point temperature T dp The difference between

[0016] According to the temperature difference of the side window glass, the temperature difference of the side window glass and the probability of fogging of the side window glass F are checked. g Corresponding relationship table, get the side window glass fogging probability F g .

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

[0018] Preferably, the side window glass dew point temperature T dp Calculated by the interior temperature and interior relative humidity.

[0019] Since the existing vehicles are not equipped with side window glass temperature sensors and side window glass humidity sensors, the temperature of the side window glass and the glass dew point temperature cannot be directly obtained. Therefore, the side window glass temperature is calculated by combining the temperature inside the vehicle and the ambient temperature outside the vehicle, and the side window glass dew point temperature is calculated by combining the temperature inside the vehicle and the relative humidity inside the vehicle. This effectively realizes the anti-fogging function of the side window glass without adding vehicle parts. It is particularly suitable for vehicles that are not equipped with side window glass temperature sensors and side window glass humidity sensors.

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

[0021]

[0022] In Formula I, T Amb Indicates the first collected vehicle external ambient temperature, in °C; T i Indicates the real-time collected vehicle interior temperature in °C; T o represents the real-time collected vehicle external ambient temperature, in °C; t is the cumulative time from the power-on of the thermal management controller to the current moment, in seconds; T g Indicates the side window glass temperature, in °C; k a represents the coefficient;

[0023] k a The calculation formula is:

[0024] In Formula II, A c Indicates the heat exchange area, which is the side window glass area in this case, in m 2 ;h c Indicates the convection heat transfer coefficient, the unit is W / (m 2 ·K), h c is the physical characteristic parameter; k c represents the heat transfer parameter; 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 by simplifying the above parameters a , which is used to represent the coefficients (not unitless proportional values) related to the physical properties of the materials involved in the heat exchange process after extracting the variables of the temperature inside and outside the vehicle and the time, and to simplify the calculation formula of the side window glass temperature.

[0025] Since the in-car temperature acquisition module is mostly arranged at the main driver's foot or the central control position on the actual vehicle, there is a certain spatial position difference with the air temperature near the side window glass that needs to be observed to calculate the side window dew point temperature. When the air conditioner is turned on for heating in spring, autumn or winter, there will be a deviation in the temperature values ​​of the two points. Therefore, the value of is obtained by adding a compensation value that changes with positive correlation to the in-car temperature. When the air conditioner is turned on for heating, the more the in-car temperature changes, the greater the temperature difference between the two points.

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

[0027]

[0028] In formula III, T p Indicates the temperature inside the car near the side window glass, in °C; RH p Indicates the relative humidity in the car near the side window glass, in %; T dp Indicates the dew point temperature of the side window glass, in °C; γ(RH p , H p) is the key variable T in the calculation formula p and RH p The simplified process formula after extraction; a and b represent the p Changing tuning parameters;

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

[0030]

[0031] Since the relative humidity collection module is usually located above the rearview mirror on the front windshield, the humidity generated by human breathing accumulates at the side windows, which is closer, and there is a difference with the value collected by the humidity module. At the same time, the humidity generated by human breathing will diffuse in the car, causing the accumulation of humidity on the side windows to slow down. Therefore, RH p The value of is obtained by adding a gain compensation value that changes positively with the space inside the car and a loss compensation value that changes positively with the number of people in the car to the relative humidity near the front windshield. By setting the compensation value, the spatial difference caused by the layout of the temperature acquisition module and the humidity acquisition module in the car can be compensated.

[0032] Preferably, the vehicle interior temperature near the side window glass is T p Equal to the real-time collected vehicle interior temperature T i And temperature compensation value T err The temperature compensation value T err By checking the temperature compensation value T err The temperature difference between the inside and outside of the car is equal to the real-time collected temperature T i The real-time collected vehicle external ambient temperature T o difference.

[0033] Preferably, the relative humidity RH in the vehicle near the side window glass is p Equal to the relative humidity near the windshield, gain compensation value RH u and the gain reduction compensation value RH d The gain compensation value RH u By checking the gain compensation value RH u The reduction compensation value RH is obtained from the corresponding relationship table of the volume of the vehicle interior space; d By checking the gain reduction compensation value RH d Obtained from the corresponding relationship table with the number of people in the car.

[0034] Preferably, determining the probability of fogging of the windshield according to the windshield temperature and the windshield dew point temperature of the vehicle includes:

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

[0036] Determining a windshield temperature difference, the windshield temperature difference being equal to a difference between a windshield temperature of the vehicle and a dew point temperature of the windshield;

[0037] According to the temperature difference of the front windshield, the temperature difference of the front windshield and the probability of fogging of the front windshield Q are checked. g Corresponding relationship table, get the probability Q of front windshield fogging g .

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

[0039] Preferably, the windshield temperature, the windshield dew point temperature and the relative humidity near the windshield are all collected by an optical rain sensor.

[0040] Preferably, the S2 is specifically as follows: when the smaller value of the side window glass fogging probability and the front windshield glass fogging probability is greater than or equal to the preset fogging probability and the vehicle's air conditioner is turned on, the defogger function is turned on, 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; 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 demand of the air conditioner is cooling, and if so, the compressor speed request is sent to the compressor, otherwise, the PTC power request is sent to the PCT;

[0041] When the smaller value of the side window glass fogging probability and the front windshield fogging probability is greater than or equal to the preset fogging probability and the vehicle's air conditioning is turned off, turn on the defog function, adjust the damper position according to the current damper position and the damper compensation position; adjust the air volume voltage according to the current air volume voltage and the compensation voltage; adjust the internal and external circulation damper position according to the current internal and external circulation damper position and the internal and external circulation damper compensation position; determine whether the current demand of the air conditioning is cooling, if so, send the compressor speed request to the compressor, otherwise, initiate the PTC power request to the PCT.

[0042] When the air conditioner is turned on, the current damper position, air volume voltage, and internal and external circulation damper position are precisely adjusted in combination with the compensation value to ensure that the air conditioning system operates at its best. By identifying whether the current air conditioner demand is cooling or heating, and sending corresponding requests to the compressor or PTC accordingly, the adaptability and flexibility of the air conditioning system are improved. Through intelligent defogger and air conditioning control, the system can quickly respond to and meet the driver's needs, reducing the tediousness of manual operation and improving driving convenience and comfort. By precisely controlling the operation of the air conditioning system, unnecessary energy consumption is avoided, which helps reduce the vehicle's fuel consumption and emissions, and is in line with the development trend of energy conservation and environmental protection of modern automobiles.

[0043] When the air conditioner is turned off, the damper is precisely adjusted to the optimal position according to the current damper position and the damper compensation position to ensure the defog effect. At the same time, the air volume voltage is finely adjusted according to the current air volume voltage and the compensation voltage to achieve the ideal air supply intensity. This refined adjustment method can ensure that the defog process is both efficient and energy-saving. The internal and external circulation damper positions are intelligently adjusted according to the current internal and external circulation damper positions and the internal and external circulation damper compensation positions. During the defog process, the system can flexibly switch between the internal and external circulation according to actual needs to ensure the best balance between the air circulation and the defog effect in the car. By accurately judging whether the current demand of the air conditioner is cooling, the corresponding speed or power request is sent to the compressor or PTC accordingly. This intelligent response mechanism can ensure that the air conditioning system can meet the defog demand and take into account the comfort of the temperature in the car during the defog process. In summary, the control strategy performs well in intelligent judgment and response, refined damper and air volume adjustment, intelligent internal and external circulation switching, and intelligent response to cooling and heating needs, providing drivers with a safer, more comfortable and efficient driving experience.

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

[0045] A temperature detection module, used to detect the temperature of the side window glass and the front windshield of the vehicle;

[0046] A dew point temperature calculation module, used for calculating the dew point temperature of the side window glass and the dew point temperature of the front windshield according to the temperature of the side window glass and the temperature of the front windshield;

[0047] A probability determination module, used to determine the probability of fogging of the side window glass according to the side window glass temperature and the side window glass dew point temperature, and to determine the probability of fogging of the front windshield glass according to the front windshield glass temperature and the front windshield glass dew point temperature;

[0048] The control module is used to control the defogging function to be turned on when the smaller value of the side window glass fogging probability and the front windshield glass fogging probability is greater than or equal to the preset fogging probability.

[0049] Preferably, the system further comprises:

[0050] Ambient temperature sensor, used to collect the ambient temperature outside the vehicle;

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

[0052] Optical rain sensor, used to collect the temperature of the front windshield, the relative humidity of the front windshield and the relative humidity near the front windshield;

[0053] The thermal management controller is connected to the ambient temperature sensor, the in-vehicle temperature sensor and the light and rain sensor, and is used to receive the outside ambient temperature, the in-vehicle temperature, the front windshield temperature and the front windshield relative humidity collected by the sensors, and calculate and determine the fogging probability of the side windows and the fogging probability of the front windshield;

[0054] Car controller, used for human-computer interaction.

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

[0056] The present invention further provides a vehicle, wherein the vehicle comprises the electronic device described in the present invention.

[0057] Beneficial effects of the present invention:

[0058] The control method for preventing vehicle windows from fogging of the present invention comprehensively evaluates the possibility of fogging in the vehicle by combining the probability of fogging of the side window glass and the probability of fogging of the front windshield, thereby preventing the vehicle windows from fogging, ensuring the comprehensiveness and accurate evaluation of the probability of fogging of the vehicle windows, and then timely turning on the defogger function to prevent unclear vision caused by fogging of the vehicle windows, thereby reducing the occurrence of traffic accidents, improving driving safety and comfort, and effectively solving the problem of large errors in the existing vehicle system when only relying on the glass surface temperature and dew point temperature collected by the windshield temperature and humidity sensor to judge the risk of fogging in the vehicle, and at the same time overcoming the difficulty of not being able to timely realize defoggering of the side windows, thereby avoiding affecting the driver's vision through the rearview mirror and the comfort experience of the passengers, and having promotion and application value in the field of automobile intelligent control technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] Figure 1 Flow chart of the control method for preventing vehicle windows from fogging;

[0060] Figure 2 is a first structural schematic diagram of a control system;

[0061] Figure 3 It is a second structural schematic diagram of the control system. DETAILED DESCRIPTION

[0062] The following will describe the embodiments of the present invention 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 contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways 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, 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 illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0064] In the following description, numerous details are discussed to provide a more thorough explanation of the embodiments of the present application. However, it is obvious to those skilled in the art that the embodiments of the present application can be implemented without these specific details.

[0065] The present invention intends to disclose an automatic control method, system, electronic equipment and vehicle for automobile air conditioning circulation mode, so as to solve the problem of tunnel air entering the vehicle and affecting the comfort of drivers and passengers, as well as the safety problem of manually switching the air conditioning circulation mode. It can also solve the problems that the existing control method for the air conditioning circulation mode of the vehicle entering the tunnel has low accuracy and stability, and the control strategy is too single and may not be able to adapt to all tunnel environments.

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

[0067] S1. When the defog function of the vehicle is not turned on, determining the fogging probability of the side window glass according to the temperature of the side window glass and the dew point temperature of the side window glass; determining the fogging probability of the front windshield according to the temperature of the front windshield glass and the dew point temperature of the front windshield;

[0068] S2. When the smaller value of the side window glass fogging probability and the front windshield glass fogging probability is greater than or equal to the preset fogging probability, the defogger function is turned on and the information is sent to the vehicle computer for display.

[0069] By combining the probability of fogging of the side windows and the probability of fogging of the windshield, the possibility of fogging in the car is comprehensively evaluated, thereby preventing the fogging of the windows, ensuring a comprehensive and accurate evaluation of the probability of fogging of the windows, and then by timely turning on the defogger function, unclear vision caused by fogging of the windows is prevented, reducing the occurrence of traffic accidents, improving driving safety and comfort, and effectively solving the problem of large errors in the existing vehicle system when it only relies on the glass surface temperature and dew point temperature collected by the windshield temperature and humidity sensor to judge the risk of fogging in the car. At the same time, it also overcomes the problem of not being able to defog the side windows in time, thereby avoiding affecting the driver's vision through the rearview mirror and the comfort experience of the passengers.

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

[0071] Obtain the vehicle's side window glass temperature and side window glass dew point temperature;

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

[0073] According to the temperature difference of the side window glass, the temperature difference of the side window glass and the probability of fogging of the side window glass F are checked. g Corresponding relationship table, get the side window glass fogging probability F g ;

[0074] The corresponding relationship table between the temperature difference of the side window glass and the fogging probability of the side window glass is 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 The side window glass dew point temperature T dp The difference is negatively correlated.

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

[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 achieve the control of the side window glass anti-fogging without adding vehicle hardware equipment, the side window glass temperature T g Calculated by the temperature inside the vehicle and the ambient temperature outside the vehicle; the side window glass dew point temperature T dp Calculated by the interior temperature and interior relative humidity.

[0080] Through experimental derivation and verification, the side window glass temperature T g The calculation formula is as follows:

[0081]

[0082] In Formula I, T Amb Indicates the first collected vehicle external ambient temperature, in °C; T i Indicates the real-time collected vehicle interior temperature in °C; T o represents the real-time collected vehicle external ambient temperature, in °C; t is the cumulative time from the power-on of the thermal management controller to the current moment, in seconds; k a Represents coefficient; T g Indicates the side window glass temperature in °C;

[0083] k a The calculation formula is:

[0084] In Formula II, A c Indicates the heat exchange area, which is the side window glass area in this case, in m 2 ;h c Indicates the convection heat transfer coefficient, the unit is W / (m 2 ·K), h c The value of k is between 5.5 and 8.0; c represents the heat transfer parameter; 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, A is calculated for a certain research object vehicle model. 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; the value of c is 0.837; the value of m is 4.688.

[0086] Among them, k a Indicates that in addition to the real-time collected vehicle interior temperature T i , Real-time collected vehicle external ambient temperature T o Other coefficients besides the three key variables, k a Derived from the heat balance formula; the heat balance calculation formula is as follows:

[0087]

[0088] Among them, Q c The heat exchange rate generated when there is a temperature difference on both sides of the side window glass, in kJ; Qg Q is the heat absorbed by the side window glass due to the heat exchange process, in kJ. In this application, the smaller heat influencing factors such as human body heat dissipation, interior heat absorption, and electrical heat dissipation are ignored, and Q c and Q g are considered equal, and the side window glass temperature is calculated when dynamic thermal equilibrium is reached.

[0089] Parameter h c and k c With T i -T o There is a positive correlation.

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

[0091]

[0092] In formula III, T p Indicates the temperature inside the car near the side window glass, in °C; RH p Indicates the relative humidity in the car near the side window glass, in %; T dp Indicates the dew point temperature of the side window glass, in °C; γ(RH p , H p ) represents the simplified process formula after extracting the key variables in the calculation formula; a and b represent the p Changing tuning parameters;

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

[0094]

[0095] In some embodiments, the vehicle interior temperature near the side window glass is T p Equal to the real-time collected vehicle interior temperature T i And temperature compensation value T err The sum of temperature compensation value T err By checking the temperature compensation value T err The temperature difference between the inside and outside of the car is equal to the real-time collected temperature T i The real-time collected vehicle external ambient temperature T o difference.

[0096] In this embodiment, for a certain research object vehicle model, the temperature compensation value T err The corresponding relationship table with the temperature difference between inside and outside the vehicle is shown in Table 2, and the corresponding relationship table is obtained through experimental calibration.

[0097] Table 2 shows the relationship between temperature compensation value and temperature difference between inside and outside 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 in the vehicle near the side window glass p Equal to the relative humidity near the windshield, gain compensation value RH u and the gain reduction compensation value RH d The sum of the gain compensation value RH u By checking the gain compensation value RH u Obtained from the corresponding relationship table of the interior space volume; reduction compensation value RH d By checking the gain reduction compensation value RH d The gain compensation value RH is obtained from the corresponding relationship table with the number of people in the car. u Correspondence table with the interior space volume and reduction compensation value RH d The corresponding relationship tables with the number of people in the car are obtained through experimental calibration.

[0101] In this embodiment, for a certain research object vehicle model, the reduction compensation value RH d The corresponding relationship table with the number of people N in the car is shown in Table 3.

[0102] Table 3 shows the gain reduction compensation value RH d Corresponding relationship table with the number of people N in the car

[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 fogging of the front windshield according to the front windshield temperature and the front windshield dew point temperature of the vehicle includes:

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

[0106] Determine a windshield temperature difference, the windshield temperature difference being equal to the difference between the windshield temperature of the vehicle and the dew point temperature of the windshield;

[0107] According to the temperature difference of the front windshield, the probability of fogging of the front windshield is obtained by looking up the corresponding relationship table between the temperature difference of the front windshield and the probability of fogging of the front windshield. The corresponding relationship table between the temperature difference of the front windshield and the probability of fogging of the front windshield is obtained through experimental calibration.

[0108] Among them, the windshield temperature, the windshield dew point temperature and the relative humidity near the windshield are all collected by the optical rain sensor.

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

[0110] In some embodiments, S2 specifically includes: when the smaller value of the side window glass fogging probability and the front windshield glass fogging probability is greater than or equal to the preset fogging probability and the vehicle's air conditioner is turned on, the defog function is turned on, 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; 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 demand of the air conditioner is cooling, if so, the compressor speed request is sent to the compressor, otherwise, the PTC power request is initiated to the PTC;

[0111] When the smaller value of the side window glass fogging probability and the front windshield fogging probability is greater than or equal to the preset fogging probability and the vehicle's air conditioning is turned off, turn on the defog function, adjust the damper position according to the current damper position and the damper compensation position; adjust the air volume voltage according to the current air volume voltage and the compensation voltage; adjust the internal and external circulation damper position according to the current internal and external circulation damper position and the internal and external circulation damper compensation position; determine whether the current demand of the air conditioning is cooling, if so, send the compressor speed request to the compressor, otherwise, initiate the PTC power request to the PTC.

[0112] Among them, the damper compensation position is obtained by checking the corresponding relationship table between fogging probability and damper compensation position; the compensation voltage is obtained by checking the corresponding relationship table between fogging probability and compensation voltage; the internal and external circulation damper compensation position is obtained by checking the corresponding relationship table between fogging probability and internal and external circulation damper compensation position. The damper compensation position is obtained by checking the corresponding relationship table between fogging probability and damper compensation position, the compensation voltage is obtained by checking the corresponding relationship table between fogging probability and compensation voltage, and the internal and external circulation damper compensation position is obtained by checking the corresponding relationship table between fogging probability and internal and external circulation damper compensation position.

[0113] The fogging probability used for looking up the table for the damper compensation position is the smaller value of the fogging probability of the side window glass and the fogging probability of the front windshield glass.

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

[0115] When the defog function needs to be turned on, if the air conditioner is in the on state, the air outlet mode damper and blower will be compensated based on the current air conditioning state. 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 in the off state, the blower air volume will gradually increase from the first gear to the third gear with the probability of fogging, the circulation mode damper will move to the external circulation, and the air outlet mode damper will move to the window blowing position.

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

[0117] A temperature detection module, used to detect the temperature of the side window glass and the front windshield of the vehicle;

[0118] A dew point temperature calculation module, used for calculating the dew point temperature of the side window glass and the dew point temperature of the front windshield according to the temperature of the side window glass and the temperature of the front windshield;

[0119] A probability determination module, used to determine the probability of fogging of the side window glass according to the side window glass temperature and the side window glass dew point temperature, and to determine the probability of fogging of the front windshield glass according to the front windshield glass temperature and the front windshield glass dew point temperature;

[0120] The control module is used to control the defogging function to be turned on when the smaller value of the side window glass fogging probability and the front windshield glass fogging probability is greater than or equal to the preset fogging probability.

[0121] In some embodiments, 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 outside the vehicle to the thermal management controller;

[0123] An in-vehicle temperature sensor is used to collect the in-vehicle temperature and transmit the collected in-vehicle temperature to a thermal management controller;

[0124] An optical rain sensor is used to collect the temperature of the front windshield, the relative humidity of the front windshield and the relative humidity near the front windshield, and transmit the collected temperature of the front windshield, the relative humidity of the front windshield and the relative humidity near the front windshield to a thermal management controller;

[0125] The thermal management controller is connected to the ambient temperature sensor, the in-vehicle temperature sensor and the light and rain sensor, and is used to receive the ambient temperature outside the vehicle, the in-vehicle temperature, the temperature of the front windshield and the relative humidity of the front windshield collected by the sensors, and calculate the probability of fogging of the side windows and the front windshield. At the same time, it determines the subsequent execution action of the defogger system by receiving the defogger function switch status and air conditioning status information sent by the vehicle controller;

[0126] Car controller, used for human-computer interaction.

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

[0128] Among them, the vehicle controller is used for user operation of air-conditioning button information and display of air volume, circulation and mode, to judge the air-conditioning on / off status and the defogger function on / off status, and to transmit the information to the thermal management controller; at the same time, the vehicle controller receives the air volume, air outlet mode and circulation status fed back by the thermal management controller to display the air-conditioning status on the vehicle screen.

[0129] The HVAC air conditioning box contains the air outlet mode damper actuator, the internal and external circulation damper actuator and the blower. The function of the HVAC air conditioning box is to adjust the air outlet effect of the air conditioning, such as air volume, air temperature, wind direction, etc.

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

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

[0132] A blower is a device that can change the air volume of an air conditioner.

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

[0134] The compressor is a device that provides a cooling source for the passenger compartment.

[0135] The communication network between controllers is a medium or mechanism for transmitting signals between controllers, such as a CAN bus or a CANFD bus.

[0136] The function of the car display screen is to receive air-conditioning information operated by the user, display the current status of the air-conditioning, and realize human-computer interaction.

[0137] In some embodiments, an electronic device is also provided, including a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the steps of the control method for preventing vehicle windows from fogging as in any of the above embodiments are implemented.

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

[0139] To sum up, the control method for preventing vehicle windows from fogging of the present invention comprehensively evaluates the possibility of fogging in the vehicle by combining the probability of fogging of the side window glass and the probability of fogging of the front windshield, thereby preventing the vehicle windows from fogging, ensuring the comprehensiveness and accurate evaluation of the probability of fogging of the vehicle windows, and then timely turning on the defogger function to prevent unclear vision caused by fogging of the vehicle windows, thereby reducing the occurrence of traffic accidents, improving driving safety and comfort, and effectively solving the problem of large errors in the existing vehicle system when it only relies on the glass surface temperature and dew point temperature collected by the windshield temperature and humidity sensor to judge the risk of fogging in the vehicle, and at the same time overcomes the difficulty of not being able to realize defogger of the side windows in time, thereby avoiding affecting the driver's vision through the rearview mirror and the comfort experience of the passengers, and has promotion and application value in the field of automobile 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 the present application. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by a person of ordinary skill in the art without departing from the spirit and technical ideas disclosed in the present application shall still be covered by the claims of the present application.

Claims

1. A control method for preventing vehicle windows from fogging, characterized in that: The following steps are involved: S1. When the defog function of the vehicle is not turned on, determining the fogging probability of the side window glass according to the temperature of the side window glass and the dew point temperature of the side window glass; determining the fogging probability of the front windshield according to the temperature of the front windshield glass and the dew point temperature of the front windshield; S2. When the smaller value of the side window glass fogging probability and the front windshield glass fogging probability is greater than or equal to the preset fogging probability, the defogger function is turned on.

2. The control method for preventing vehicle window fogging according to claim 1, characterized in that: Determining the fogging probability of the side window glass according to the side window glass temperature of the vehicle and the dew point temperature of the side window glass includes: Obtain the vehicle's side window glass temperature and side window glass dew point temperature; Determine the side window glass temperature difference, which is equal to the side window glass temperature T of the vehicle g The side window glass dew point temperature T dp The difference between According to the temperature difference of the side window glass, the temperature difference of the side window glass and the probability of fogging of the side window glass F are checked. g Corresponding relationship table, get the side window glass fogging probability F g ; And / or, determining the probability of fogging of the windshield according to the windshield temperature and the windshield dew point temperature of the vehicle includes: Get the vehicle's front windshield temperature and front windshield dew point temperature; Determining a windshield temperature difference, the windshield temperature difference being equal to a difference between a windshield temperature of the vehicle and a dew point temperature of the windshield; According to the temperature difference of the front windshield, the temperature difference of the front windshield and the probability of fogging of the front windshield Q are checked. g Corresponding relationship table, get the probability Q of front windshield fogging g .

3. The control method for preventing vehicle window fogging according to claim 2, characterized in that: The side window glass temperature T g Calculated by the temperature inside the car and the ambient temperature outside the car; And / or, the side window glass dew point temperature T dp Calculated by the temperature and relative humidity inside the car; And / or, the front windshield temperature and the front windshield dew point temperature are collected by a sensor.

4. The control method for preventing vehicle window fogging according to claim 3, characterized in that: The side window glass temperature T g The calculation formula is as follows: In Formula I, T Amb Indicates the first collected vehicle external ambient temperature, in °C; T i Indicates the real-time collected vehicle interior temperature in °C; T o Indicates the real-time collected vehicle external ambient temperature, in °C; t is the cumulative time from the power-on of the thermal management controller to the current moment, in seconds; T g Indicates the side window glass temperature, in °C; k a represents the coefficient; k a The calculation formula is: In Formula II, A c Indicates the side window glass area, in m 2 ; h c Indicates the convection heat transfer coefficient, the unit is W / (m 2 ·K); k c represents the heat transfer parameter; 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 side window glass dew point temperature T dp The calculation formula is as follows: In formula III, T p Indicates the temperature inside the car near the side window glass, in °C; RH p Indicates the relative humidity in the car near the side window glass, in %; T dp Indicates the dew point temperature of the side window glass, in °C; a and b indicate adjustment parameters; The values ​​of adjustment parameters a and b are as follows:

5. The control method for preventing vehicle window fogging according to claim 4, characterized in that: The vehicle interior temperature near the side window glass is T p Equal to the real-time collected vehicle interior temperature T i And temperature compensation value T err The temperature compensation value T err By checking the temperature compensation value T err The temperature difference between the inside and outside of the car is equal to the real-time collected temperature T i The real-time collected vehicle external ambient temperature T o difference; And / or, relative humidity RH in the vehicle near the side window glass p Equal to the relative humidity near the windshield, gain compensation value RH u and the gain reduction compensation value RH d The gain compensation value RH u By checking the gain compensation value RH u The reduction compensation value RH is obtained from the corresponding relationship table of the volume of the vehicle interior space; d By checking the gain reduction compensation value RH d Obtained from the corresponding relationship table with the number of people in the car.

6. The control method for preventing vehicle window fogging according to claim 1, characterized in that: The S2 is specifically: When the smaller value of the side window glass fogging probability and the front windshield glass fogging probability is greater than or equal to the preset fogging probability and the vehicle's air conditioner is turned on, the defogger function is turned on, 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 internal and external circulation damper positions according to the current internal and external circulation damper positions and the internal and external circulation damper compensation positions; Determine whether the current demand of the air conditioner is cooling, if so, send the compressor speed request to the compressor, if not, send the PTC power request to the PCT; When the smaller value of the side window glass fogging probability and the front windshield glass fogging probability is greater than or equal to the preset fogging probability and the vehicle's air conditioner is turned off, the defogger function is turned on, 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 internal and external circulation damper positions according to the current internal and external circulation damper positions and the internal and external circulation damper compensation positions; Determine whether 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.

7. A system for implementing the control method for preventing vehicle window fogging according to any one of claims 1 to 6, characterized in that: include: A temperature detection module, used to detect the temperature of the side window glass and the front windshield of the vehicle; A dew point temperature calculation module, used for calculating the dew point temperature of the side window glass and the dew point temperature of the front windshield according to the temperature of the side window glass and the temperature of the front windshield; A probability determination module, used to determine the probability of fogging of the side window glass according to the side window glass temperature and the side window glass dew point temperature, and to determine the probability of fogging of the front windshield glass according to the front windshield glass temperature and the front windshield glass dew point temperature; The control module is used to control the defogging function to be turned on when the smaller value of the side window glass fogging probability and the front windshield glass fogging probability is greater than or equal to the preset fogging probability.

8. The system according to claim 7, characterized in that Also includes: Ambient temperature sensor, used to collect the ambient temperature outside the vehicle; In-vehicle temperature sensor, used to collect the temperature inside the vehicle; Optical rain sensor, used to collect the temperature of the front windshield, the relative humidity of the front windshield and the relative humidity near the front windshield; The thermal management controller is connected to the ambient temperature sensor, the in-vehicle temperature sensor and the light and rain sensor, and is used to receive the outside ambient temperature, the in-vehicle temperature, the front windshield temperature and the front windshield relative humidity collected by the sensors, and calculate and determine the fogging probability of the side windows and the fogging probability of the front windshield; Car controller, used for human-computer interaction.

9. An electronic device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the control method for preventing vehicle window fogging according to any one of claims 1 to 6 are implemented.

10. A vehicle, characterized in that: The vehicle includes the electronic device according to claim 9.

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