A vehicle-mounted automatic and manual integrated intelligent anti-fog and defogging control method and system

Abstract

The application discloses a kind of vehicle-mounted hand-automatic integrated intelligent anti-fog defogging control method and system in the technical field of vehicle-mounted intelligent cabin system, comprising the following steps, step 1, parameter initialization, automatic anti-fog / defogging reminder times counter C is set to 0;Step 2, anti-fog / defogging trigger source detection, including manual rear defogging button, automatic anti-fog / defogging button, microphone voice opens automatic anti-fog / defogging application;Step 3, no anti-fog / defogging trigger source is detected;Step 4, anti-fog / defogging trigger source is detected, then distinguish trigger source as manual defogging application, or automatic anti-fog / defogging application;It can be before the front windshield and the outside rearview mirror fog, according to environmental conditions, judge whether the front windshield and the outside rearview mirror enter fogging high-risk state, so as to start intelligent anti-fog system in advance, make the front windshield and the outside rearview mirror become safe state, no fog is generated, ensure driving safety.

Description

Technical Field

[0001] This invention relates to an intelligent anti-fog and defogging control method and system in the field of vehicle-mounted intelligent cockpit systems. Background Technology

[0002] The increase in car ownership leads to a rise in traffic accidents. A significant portion of these accidents occur in winter or rainy weather when fogging on the windshield obscures the driver's vision, and fogged rearview mirrors obscure the view of the vehicle's surroundings and rear, causing accidents. Although most cars on the market have a defogger button, many drivers are unaware of when fogging occurs and needs to be removed, or when it's unnecessary and can be turned off. Many drivers inappropriately activate the defogger and HVAC system, actually causing the windshield to fog up further, increasing the probability of accidents; or they continue to run the defogger and HVAC system when they don't need it, resulting in excessive energy consumption.

[0003] Currently available automotive intelligent defogging control systems are mostly detection-based systems. These systems use a signal generator to emit infrared signals. The difference in reflectivity, intensity, and refractive index between foggy and fog-free conditions causes the infrared receiver to receive signals with varying strengths and angles, thus determining whether fog has appeared on the windshield and triggering the automatic defogging system. This type of system has high requirements for the installation of the signal generator and receiver, and only begins defogging after fog has already formed on the windshield. From the appearance of fog on the windshield to the system detecting it, starting the defogging system, and finally removing the fog, several seconds or even longer can pass. During this time, the windshield is in a state of extremely low visibility, posing a significant risk of accidents. Summary of the Invention

[0004] The purpose of this invention is to provide an in-vehicle intelligent anti-fog and defogging control system and method that can activate the intelligent anti-fog system in advance before the windshield and exterior rearview mirrors enter a high-risk state of fogging, thereby avoiding fogging of the windshield and exterior rearview mirrors and ensuring driving safety.

[0005] To achieve the above objectives, the present invention provides an in-vehicle intelligent anti-fog and defogging control method with manual / automatic operation, comprising the following steps:

[0006] Step 1: Initialize parameters and set the automatic anti-fog / defog reminder counter C to 0;

[0007] Step 2, detection of anti-fog / defog trigger sources, including manual defog button, automatic anti-fog / defog button, and microphone voice activation of automatic anti-fog / defog request;

[0008] Step 3: No anti-fog / defog trigger source was detected;

[0009] Step 4: If an anti-fog / defog trigger source is detected, distinguish whether the trigger source is a manual defog request or an automatic anti-fog / defog request.

[0010] Step 5: If the request is confirmed as an automatic anti-fog / defog application, then execute the automatic anti-fog / defog sub-process.

[0011] Step 6: If the trigger source is determined to be the manual defogging button, then execute the manual defogging sub-process.

[0012] Compared with existing technologies, the advantages of this invention are that it can determine whether the windshield and exterior rearview mirrors have entered a high-risk fogging state based on environmental conditions before fogging occurs, thereby activating the intelligent anti-fog system in advance to ensure a safe state for the windshield and exterior rearview mirrors, preventing fogging and ensuring driving safety. Simultaneously, considering the shortcomings of manual defogging, this invention allows for voice activation or one-button activation of the automatic anti-fogging / defogging system, simplifying operation. This avoids frequent operation and accidental operation of the driver's defogging button and HVAC system, thus protecting the lives of occupants; it also prevents drivers from leaving the HVAC system on at inappropriate times, reducing energy waste. Furthermore, considering personal habits, it retains the traditional manual defogging button function without interference.

[0013] As a further improvement to the present invention, the specific content of step 3 is as follows:

[0014] Step 3.1: Use the windshield temperature and humidity sensor and the exterior rearview mirror temperature and humidity sensor to measure and collect the temperature of the corresponding glass, as well as the ambient temperature and relative humidity data.

[0015] Step 3.2: Calculate and analyze the dew point temperature of the air inside the passenger compartment and the dew point temperature of the air outside the vehicle behind the rearview mirror.

[0016] Step 3.3: Determine whether the windshield and exterior rearview mirrors have entered the high-risk fogging zone. Because fog will appear when the glass temperature Tg reaches or falls below the dew point temperature Tdp (i.e., Tg≤Tdp). To determine whether the vehicle has entered the high-risk fogging zone, a certain margin Tth needs to be reserved, also known as the risk margin. Therefore, when Tg-Tth≤Tdp, the vehicle is determined to have entered the high-risk fogging zone. Considering both accurate fog prevention and energy saving, Tth is set to 1.45 based on experimental experience.

[0017] Step 3.4: If the corresponding glass does not enter the high-risk area for fogging, return to Step 2.

[0018] If the corresponding glass enters a high-risk fogging zone, the automatic anti-fog / defog reminder counter C+1; if C≤3, meaning the reminder count does not exceed 3 times, an anti-fog / defog reminder is issued; the reminder message includes: displayed on the screen and played on the speaker: "There is a risk of fogging on the windshield or exterior rearview mirrors. Please turn on automatic intelligent anti-fog / defog." After the reminder is completed, return to step 2; if C>3, meaning the reminder count exceeds 3 times, C is set to 3, the reminder stops, and return to step 2.

[0019] As a further improvement to the present invention, step 5 includes the following:

[0020] Step 5.1: If the trigger source is detected as the automatic anti-fog / defog button, or the automatic anti-fog / defog is activated by voice, then jump to the automatic anti-fog / defog sub-process.

[0021] Step 5.2: Execute the automatic anti-fogging / defogging sub-process; including anti-fogging / defogging of the windshield, rear windshield, and exterior rearview mirrors. Based on environmental parameters, if the windshield or exterior rearview mirrors enter a high-risk fogging state, an anti-fogging / defogging request is sent to the air conditioning controller and the body control unit, respectively, for the windshield or rear windshield and exterior rearview mirrors. If the glass enters the system's preset safe zone, the anti-fogging / defogging equipment is turned off, and environmental parameters continue to be monitored. The opening and closing of the defogging equipment are completed automatically.

[0022] Step 5.3: If a new trigger source is input, the automatic anti-fog / defog sub-process will return the new trigger source. Based on the returned trigger source, the next step of the judgment will be made.

[0023] Step 5.4: If the trigger source is the manual defogging button, then jump to the manual defogging subprocess.

[0024] Step 5.5: If the trigger source is the automatic anti-fog / defog button, or if automatic anti-fog / defog is turned off by voice, the process ends.

[0025] As a further improvement to the present invention, the specific contents of the automatic anti-fog / defog sub-process are as follows.

[0026] Step 5.2.1, parameter initialization: set the automatic anti-fog / defog status flag SF for the windshield and the automatic anti-fog / defog status flag SR for the exterior rearview mirrors to 0 respectively;

[0027] Step 5.2.2: Simultaneously monitor the windshield and exterior rearview mirrors, and take subsequent steps according to the environmental parameters; at the same time, monitor the anti-fog / defog trigger source, and if there is a trigger source, output the trigger source and end the process.

[0028] 5. A vehicle-mounted automatic / manual integrated intelligent anti-fog and defogging control method according to claim 4, characterized in that: the specific content of the automatic anti-fog / defogging of the vehicle's exterior rearview mirror in step 5.2.2 is as follows:

[0029] 1. Measurement of sensor parameters for exterior rearview mirrors, including the temperature of the exterior rearview mirror glass, and the temperature and relative humidity of the air behind the exterior rearview mirror;

[0030] 2. Calculate the dew point temperature of the air behind the vehicle's exterior rearview mirror using parameters measured by the exterior rearview mirror sensor;

[0031] 3. Determine whether the exterior rearview mirror glass has entered the high-risk area of ​​fogging; that is, determine whether Tg-Tth≤Tdp holds true, where Tg is the temperature of the exterior rearview mirror glass, Tdp is the dew point temperature of the air behind the exterior rearview mirror, and Tth is the risk margin. Based on experimental experience, the value of Tth in this system is 1.45.

[0032] 4. If the glass of the exterior rearview mirror has not entered the high-risk area for fogging, return to step 1 above;

[0033] If the glass of the exterior rearview mirror enters the high-risk area for fogging, a rear defrosting request output is sent, that is, a heating request signal for the heating wires of the exterior rearview mirror and the rear windshield is sent to the vehicle control unit.

[0034] 5. Rear defrost working status input detection, that is, receiving and identifying feedback signals from the vehicle body control unit regarding the working status of the rear defrost heating equipment;

[0035] 6. Determine whether the post-demisting equipment is working, i.e. whether a feedback signal on the working status of the post-demisting heating equipment has been received;

[0036] 7. If no feedback signal is received, return to the above 5 steps;

[0037] If a feedback signal is received, an automatic anti-fog / defog activation success reminder will be issued. The reminder message includes: displaying on the screen and playing an audio message on the speaker: "Automatic intelligent anti-fog / defog system has been successfully activated"; at the same time, the automatic anti-fog / defog status indicator SR on the exterior rearview mirror will be valid and set to 1.

[0038] 8. Measurement of exterior rearview mirror sensor parameters, including the temperature of the exterior rearview mirror glass, and the temperature and relative humidity of the air behind the exterior rearview mirror;

[0039] 9. Calculate the dew point temperature of the air behind the vehicle's exterior rearview mirror using parameters measured by the exterior rearview mirror sensor;

[0040] 10. Determine whether the exterior rearview mirror glass has entered the safe zone; to determine whether the glass has entered the safe zone, we need to determine whether Tg-ΔT>Tdp holds true, where Tg is the temperature of the exterior rearview mirror glass, Tdp is the dew point temperature of the air behind the exterior rearview mirror, and ΔT is the safety factor; the safety factor ΔT is 4.9.

[0041] 11. If the glass of the exterior rearview mirror does not enter the safe zone, return to step 8 above;

[0042] If the glass of the exterior rearview mirror enters the safe zone, a request to turn off the rear defroster is sent; that is, a request signal to the vehicle body control unit is sent to turn off the heating of the exterior rearview mirror and rear windshield heating wires.

[0043] 12. Rear defrost working status input detection, that is, receiving and identifying the feedback signal from the vehicle body control unit to this system regarding the working status of the rear defrost heating equipment;

[0044] 13. Determine whether the post-demisting equipment is turned off, i.e., whether a feedback signal indicating the post-demisting heating equipment is off has been received;

[0045] 14. If no feedback signal is received, return to step 12 above;

[0046] If a feedback signal is received, the SR flag for the automatic anti-fog / defog status of the exterior rearview mirror will be cleared to 0.

[0047] 15. Return to step 1 above.

[0048] As a further improvement to the present invention, the specific details of the automatic anti-fog / defog function of the windshield in step 5.2.2 are as follows:

[0049] 1. Measurement of windshield sensor parameters, including the temperature inside the windshield, as well as the temperature and relative humidity behind the windshield and inside the vehicle;

[0050] 2. Calculate the dew point temperature of the air inside the vehicle behind the windshield using parameters measured by the windshield sensor.

[0051] 3. Determine whether the windshield has entered the high-risk zone for fogging, i.e., determine whether Tg-Tth≤Tdp holds true. Here, Tg is the temperature of the windshield, Tdp is the dew point temperature of the air inside the vehicle behind the windshield, and Tth is the risk margin. Based on experimental experience, Tth is set to 1.45.

[0052] 4. If the windshield has not entered the high-risk area for fogging, return to step 1 above;

[0053] If the windshield enters the high-risk zone for fogging, proceed to the next step to determine if the interior temperature is ≥26℃.

[0054] 4.1.1 If the interior temperature is ≥26℃, the air conditioning controller will be notified via CAN to open the air vents facing the windshield, turn on the air conditioning HVAC system, turn on the compressor, and set it to external circulation and cooling mode. This will rapidly reduce the relative humidity and temperature inside the vehicle, thereby lowering the dew point temperature inside the vehicle, making the dew point temperature inside the vehicle increasingly lower than the temperature of the windshield.

[0055] 4.1.2, Cooling and dehumidification working status input detection, that is, receiving and detecting the feedback signal of cooling and dehumidification working status sent by the air conditioner controller to this system via CAN bus;

[0056] 4.1.3 Determine whether the air conditioner's cooling and dehumidification functions are working properly, i.e., whether a feedback signal indicating the working status of the cooling and dehumidification functions is received;

[0057] 4.1.4 If no feedback signal is received, return to step 4.1.2 above;

[0058] If a feedback signal is received, an automatic anti-fog / defog activation success notification will be issued. The notification message includes: displaying on the screen and playing an audio message on the speaker: "Automatic intelligent anti-fog / defog system has been successfully activated." At the same time, the automatic anti-fog / defog status flag SF on the windshield will be valid and set to 1.

[0059] 4.2.1 If the interior temperature is <26℃, the air conditioning controller will be notified via CAN to open the air vents facing the windshield in heating mode. The heat energy of the engine coolant will be used to directly blow hot air to heat the windshield, thereby raising the temperature of the windshield and making it increasingly higher than the dew point temperature inside the vehicle.

[0060] 4.2.2 Heating operation status input detection, that is, receiving and detecting the feedback signal of heating operation status sent by the air conditioner controller to this system via the CAN bus;

[0061] 4.2.3 Determine whether the air conditioner heating is working properly, i.e., whether a feedback signal indicating the heating status is received;

[0062] 4.2.4 If no feedback signal is received, return to step 4.2.2 above;

[0063] If a feedback signal is received, an automatic anti-fog / defog activation success notification will be issued. The notification message includes: displaying on the screen and playing an audio message on the speaker: "Automatic intelligent anti-fog / defog system has been successfully activated." At the same time, the automatic anti-fog / defog status flag SF on the windshield will be valid and set to 1.

[0064] 5. Measurement of windshield sensor parameters, including the temperature inside the windshield, as well as the temperature and relative humidity behind the windshield and inside the vehicle;

[0065] 6. Calculate the dew point temperature of the air inside the vehicle behind the windshield using parameters measured by the windshield sensor.

[0066] 7. Determine whether the windshield has entered the safe zone, i.e., determine whether Tg-ΔT>Tdp holds true. Here, Tg is the temperature of the windshield, Tdp is the dew point temperature of the air inside the vehicle behind the windshield, and ΔT is the safety factor. Based on experimental experience, the value of ΔT in this system is 4.9.

[0067] 8. If the windshield has not entered the safe zone, return to step 5 above;

[0068] If the windshield enters the safe zone, a request to turn off the air conditioning is sent, that is, a signal to the air conditioning controller to request the air conditioning system to be turned off is sent.

[0069] 9. Air conditioner off status input detection, that is, receiving and detecting the feedback signal of the air conditioner controller to this system indicating the off status of the air conditioner system via CAN;

[0070] 10. Determine if the air conditioning system is off. That is, check if a feedback signal indicating the air conditioning system is off has been received.

[0071] 11. If no feedback signal is received, return to step 9 above;

[0072] If a feedback signal is received, the automatic anti-fog / defog status flag SF of the windshield will be cleared to 0.

[0073] 12. Return to step 1 above.

[0074] As a further improvement to the present invention, the specific content of the trigger source detection in step 5.2.2 is as follows:

[0075] 1. Detection of anti-fog / defog trigger sources, including manual defog button, automatic anti-fog / defog button, and microphone voice prompt to disable automatic anti-fog / defog request;

[0076] 2. Determine if there is a trigger source for anti-fog / defogging;

[0077] 3. If there is no anti-fog / defog trigger source, return to step 1 above;

[0078] 4. If there is an anti-fog / defog trigger source, then check if SF is equal to 1;

[0079] 4.1.1 If SF=1, then issue a request to turn off the air conditioner.

[0080] 4.1.2, Air Conditioner Off Status Input Detection; that is, receiving and detecting the feedback signal from the air conditioner controller indicating the air conditioner system's off status via CAN.

[0081] 4.1.3 Determine if the air conditioning system is off. That is, whether a feedback signal indicating the air conditioning system is off has been received.

[0082] 4.1.4 If no feedback signal is received, return to step 3.4.2 above;

[0083] 4.1.5 If a feedback signal is received, the automatic anti-fog / defog working status flag SF of the windshield will be cleared to 0;

[0084] 4.1.6, Trigger source output, process ends;

[0085] 5. If SF=0, then check if SR equals 1;

[0086] 5.1.1 If SR=1, then send a request to the vehicle body control unit to turn off the rear defroster.

[0087] 5.1.2 Rear defrost working status input detection; that is, receiving and identifying the feedback signal from the vehicle body control unit to this system regarding the working status of the rear defrost heating equipment;

[0088] 5.1.3 Determine if the post-demisting equipment is working. That is, whether a feedback signal indicating the working status of the post-demisting heating equipment has been received;

[0089] 5.1.4 If no feedback signal is received, return to step 5.1.2 above;

[0090] 5.1.5 If a feedback signal is received, the SR flag for the automatic anti-fog / defog operation status of the exterior rearview mirror will be cleared to 0.

[0091] 5.1.6, Trigger source output, process ends;

[0092] 6. If SR=0, the source output is triggered directly, and the process ends.

[0093] As a further improvement to the present invention, the specific details of manual anti-fogging / defogging in step 6 are as follows.

[0094] Step 6.1, Rear Defogging Request Output. This sends a request signal to the vehicle body control unit to activate the heating of the exterior rearview mirrors and rear windshield heating elements;

[0095] Step 6.2, Rear defrost working status input detection, that is, receiving and identifying the feedback signal of the working status of the rear defrost heating equipment sent to this system by the vehicle body control unit;

[0096] Step 6.3: Determine if the post-demisting equipment is working. That is, whether a feedback signal indicating the working status of the post-demisting heating equipment has been received.

[0097] Step 6.4: If no feedback signal is received, return to step 2 above; if a feedback signal is received, proceed to the next step.

[0098] Step 6.5, detection of anti-fog / defog trigger sources, including manual defog button, automatic anti-fog / defog button, and microphone voice activation of automatic anti-fog / defog request;

[0099] Step 6.6: Determine if there is an anti-fog / defog trigger source;

[0100] Step 6.7: If there is no anti-fog / defog trigger source, return to step 5 above; if there is an anti-fog / defog trigger source, proceed to the next step.

[0101] Step 6.8 If there is an anti-fog / defog trigger source, the rear defogger will be turned off, that is, a request signal to the vehicle body control unit will be sent to turn off the heating of the exterior rearview mirror and the rear windshield heating wire.

[0102] Step 6.9, Rear defrost working status input detection, that is, receiving and identifying the feedback signal from the vehicle body control unit to this system regarding the working status of the rear defrost heating equipment;

[0103] Step 6.10: Determine whether the post-demisting equipment is turned off. Specifically, check if a feedback signal indicating the post-demisting heating equipment is off has been received.

[0104] Step 6.11: If no feedback signal is received, return to step 6.9 above.

[0105] If a feedback signal is received, the source output is triggered, and the process ends.

[0106] To achieve the above objectives, the present invention also provides an in-vehicle intelligent anti-fog and defogging control system, including an automotive entertainment application processor. The automotive entertainment application processor is connected to a button detection circuit, a temperature and humidity sensor, an automotive audio processor, a rear defogging operation request output circuit, a rear defogging operation status input circuit, a CAN circuit, and a display screen. The button detection circuit is connected to the manual rear defogging button and the automatic anti-fog / defogging button. The automotive audio processor is connected to a microphone and a power amplifier. The power amplifier is connected to the vehicle horn. The rear defogging operation request output circuit and the rear defogging operation status input circuit are both connected to the vehicle control unit. The CAN circuit is connected to the air conditioning controller.

[0107] Compared with existing technologies, the advantages of this invention lie in its simple system structure and effective strengthening of the connection between the central control system and the air conditioning controller. Without increasing other costs, it helps determine the necessity and timing of defogging / defogging the windshield and exterior rearview mirrors. By activating the intelligent defogging system before the windshield and exterior rearview mirrors reach a high-risk fogging state, it avoids fogging and ensures driving safety. The automatic defogging / defogging system not only protects the lives of people inside the vehicle but also saves energy, playing a crucial role in fuel efficiency.

[0108] As a further improvement of the present invention, two temperature and humidity sensors are provided, one of which is located on the inner side of the glass of one of the two exterior rearview mirrors, and the second is located on the inner side of the upper part of the windshield, directly opposite the interior rearview mirror.

[0109] This method uses temperature and humidity sensors on the exterior rearview mirrors to measure the temperature of the mirror glass, as well as the ambient temperature and relative humidity behind the mirrors, to accurately determine whether the mirrors are fogged up. Similarly, it uses temperature and humidity sensors on the windshield to measure the temperature of the windshield, as well as the ambient temperature and relative humidity behind the windshield, to accurately determine whether the inside of the windshield is fogged up. Attached Figure Description

[0110] Figure 1 This is the overall flowchart of the present invention.

[0111] Figure 2 This is a flowchart illustrating the implementation of the automatic anti-fog / defog operation sub-process of the present invention.

[0112] Figure 3 This is a flowchart illustrating the implementation of the manual defogging sub-process of the present invention.

[0113] Figure 4 This is a system block diagram of the present invention.

[0114] Figure 5 This is a schematic diagram of the sensor installation according to the present invention.

[0115] Among them, 1 is a temperature and humidity sensor, 2 is the windshield, and 3 is the exterior rearview mirror. Implementation

[0116] The present invention will be further described below with reference to the accompanying drawings:

[0117] like Figure 1-3 The method for controlling vehicle-mounted automatic and manual intelligent anti-fog and defogging is characterized by the following steps:

[0118] Step 1: Initialize parameters and set the automatic anti-fog / defog reminder counter C to 0;

[0119] Step 2, detection of anti-fog / defog trigger sources, including manual defog button, automatic anti-fog / defog button, and microphone voice activation of automatic anti-fog / defog request;

[0120] Step 3: No anti-fog / defog trigger source was detected;

[0121] Step 3.1: Use the windshield temperature and humidity sensor and the exterior rearview mirror temperature and humidity sensor to measure and collect the temperature of the corresponding glass and the temperature and relative humidity of the environment.

[0122] Step 3.2: Calculate and analyze the dew point temperature of the air inside the passenger compartment and the dew point temperature of the air outside the vehicle behind the rearview mirror.

[0123] Step 3.3: Determine whether the windshield and exterior rearview mirrors 3 have entered the high-risk fogging zone. Because when the glass temperature Tg reaches or falls below the dew point temperature Tdp (i.e., Tg≤Tdp), fog will appear. To determine whether the vehicle has entered the high-risk fogging zone, a certain margin Tth needs to be reserved, also known as the risk margin. Therefore, when Tg-Tth≤Tdp, the vehicle is determined to have entered the high-risk fogging zone. Considering both accurate fog prevention and energy saving, Tth is set to 1.45 based on experimental experience.

[0124] Step 3.4: If the corresponding glass does not enter the high-risk area for fogging, return to Step 2.

[0125] If the corresponding glass enters a high-risk fogging zone, the automatic anti-fog / defog reminder counter C+1; if C≤3, meaning the reminder count does not exceed 3 times, an anti-fog / defog reminder is issued; the reminder message includes: displayed on the screen and played on the speaker: "There is a risk of fogging on the windshield or exterior rearview mirror 3. Please turn on the automatic intelligent anti-fog / defog." After the reminder is completed, return to step 2; if C>3, meaning the reminder count exceeds 3 times, C is set to 3, the reminder stops, and return to step 2.

[0126] Step 4: If an anti-fog / defog trigger source is detected, distinguish whether the trigger source is a manual defog request or an automatic anti-fog / defog request.

[0127] Step 5: If the request is confirmed as an automatic anti-fog / defog application, then execute the automatic anti-fog / defog sub-process.

[0128] Step 5.1: If the trigger source is detected as the automatic anti-fog / defog button, or the automatic anti-fog / defog is activated by voice, then jump to the automatic anti-fog / defog sub-process.

[0129] Step 5.2: Execute the automatic anti-fogging / defogging sub-process; including anti-fogging / defogging of the windshield, rear windshield, and exterior rearview mirrors 3. Based on environmental parameters, if the windshield or exterior rearview mirrors 3 enter a high-risk fogging state, an anti-fogging / defogging request is sent to the air conditioning controller and the body control unit, respectively, for the windshield or rear windshield and exterior rearview mirrors 3. If the glass enters the system's preset safe zone, the anti-fogging / defogging equipment is turned off, and environmental parameters continue to be monitored. The opening and closing of the defogging equipment are completed automatically.

[0130] Step 5.2.1, parameter initialization: set the automatic anti-fog / defogger status flag SF for the windshield and the automatic anti-fog / defogger status flag SR for the exterior rearview mirrors to 0 respectively;

[0131] Step 5.2.2: Simultaneously monitor the windshield and exterior rearview mirrors 3, and take subsequent steps according to the environmental parameters; at the same time, monitor the anti-fog / defog trigger source, and if there is a trigger source, output the trigger source and end the process.

[0132] The specific details of the automatic anti-fog / defog function of the vehicle's exterior rearview mirror 3 in step 5.2.2 are as follows:

[0133] 1. Measurement of sensor parameters for the exterior rearview mirror 3, including the temperature of the glass of the exterior rearview mirror 3, and the temperature and relative humidity of the air behind the exterior rearview mirror 3;

[0134] 2. Calculate the dew point temperature of the air behind the vehicle's exterior rearview mirror 3 using the parameters measured by the sensor 3.

[0135] 3. Determine whether the exterior rearview mirror 3 glass has entered the high-risk area of ​​fogging; that is, determine whether Tg-Tth≤Tdp holds true, where Tg is the temperature of the exterior rearview mirror 3 glass, Tdp is the dew point temperature of the air behind the exterior rearview mirror 3, and Tth is the risk margin. Based on experimental experience, the value of Tth in this system is 1.45.

[0136] 4. If the glass of the exterior rearview mirror 3 has not entered the high-risk area for fogging, then return to step 1 above;

[0137] If the glass of the exterior rearview mirror 3 enters the high-risk area for fogging, a rear defogging request output is sent, that is, a heating request signal for the exterior rearview mirror 3 and the rear windshield heating element is sent to the vehicle control unit.

[0138] 5. Rear defrost working status input detection, that is, receiving and identifying feedback signals from the vehicle body control unit regarding the working status of the rear defrost heating equipment;

[0139] 6. Determine whether the post-demisting equipment is working, i.e. whether a feedback signal on the working status of the post-demisting heating equipment has been received;

[0140] 7. If no feedback signal is received, return to the above 5 steps;

[0141] If a feedback signal is received, an automatic anti-fog / defog activation success reminder will be issued. The reminder message includes: displaying on the screen and playing an audio message on the speaker: "Automatic intelligent anti-fog / defog system has been successfully activated"; at the same time, the SR indicator bit of the automatic anti-fog / defog working status of the exterior rearview mirror 3 will be valid and set to 1.

[0142] 8. Measurement of sensor parameters for the exterior rearview mirror 3, including the temperature of the glass of the exterior rearview mirror 3, and the temperature and relative humidity of the air behind the exterior rearview mirror 3;

[0143] 9. Calculate the dew point temperature of the air behind the vehicle's exterior rearview mirror 3 using the parameters measured by the sensor 3.

[0144] 10. Determine whether the exterior rearview mirror 3 glass has entered the safe zone; to determine whether the glass has entered the safe zone, that is, to determine whether Tg-ΔT>Tdp holds true, where Tg is the temperature of the exterior rearview mirror 3 glass, Tdp is the dew point temperature of the air behind the exterior rearview mirror 3, and ΔT is the safety factor; the safety factor ΔT is 4.9.

[0145] 11. If the glass of the exterior rearview mirror 3 does not enter the safe zone, return to step 8 above;

[0146] If the glass of the exterior rearview mirror 3 enters the safe zone, a request to turn off the rear defroster is sent; that is, a request signal to the vehicle body control unit is sent to turn off the heating of the exterior rearview mirror 3 and the rear windshield heating element.

[0147] 12. Rear defrost working status input detection, that is, receiving and identifying the feedback signal from the vehicle body control unit to this system regarding the working status of the rear defrost heating equipment;

[0148] 13. Determine whether the post-demisting equipment is turned off, i.e., whether a feedback signal indicating the post-demisting heating equipment is off has been received;

[0149] 14. If no feedback signal is received, return to step 12 above;

[0150] If a feedback signal is received, the SR flag of the automatic anti-fog / defog working status of the exterior rearview mirror 3 will be cleared to 0;

[0151] 15. Return to step 1 above.

[0152] The specific details of the automatic anti-fog / defogger function for the windshield in step 5.2.2 are as follows:

[0153] 1. Measurement of windshield sensor parameters, including the temperature inside the windshield, as well as the temperature and relative humidity behind the windshield and inside the vehicle;

[0154] 2. Calculate the dew point temperature of the air inside the vehicle behind the windshield using parameters measured by the windshield sensor.

[0155] 3. Determine whether the windshield has entered the high-risk zone for fogging, i.e., determine whether Tg-Tth≤Tdp holds true. Here, Tg is the temperature of the windshield, Tdp is the dew point temperature of the air inside the vehicle behind the windshield, and Tth is the risk margin. Based on experimental experience, Tth is set to 1.45.

[0156] 4. If the windshield has not entered the high-risk area for fogging, return to step 1 above;

[0157] If the windshield enters the high-risk zone for fogging, proceed to the next step to determine if the interior temperature is ≥26℃.

[0158] 4.1.1 If the interior temperature is ≥26℃, the air conditioning controller will be notified via CAN to open the air vents facing the windshield, turn on the air conditioning HVAC system, turn on the compressor, and set it to external circulation and cooling mode. This will rapidly reduce the relative humidity and temperature inside the vehicle, thereby lowering the dew point temperature inside the vehicle, making the dew point temperature inside the vehicle increasingly lower than the temperature of the windshield.

[0159] 4.1.2, Cooling and dehumidification working status input detection, that is, receiving and detecting the feedback signal of cooling and dehumidification working status sent by the air conditioner controller to this system via CAN bus;

[0160] 4.1.3 Determine whether the air conditioner's cooling and dehumidification functions are working properly, i.e., whether a feedback signal indicating the working status of the cooling and dehumidification functions is received;

[0161] 4.1.4 If no feedback signal is received, return to step 4.1.2 above;

[0162] If a feedback signal is received, an automatic anti-fog / defog activation success notification will be issued. The notification message includes: displaying on the screen and playing an audio message on the speaker: "Automatic intelligent anti-fog / defog system has been successfully activated." At the same time, the automatic anti-fog / defog status flag SF on the windshield will be valid and set to 1.

[0163] 4.2.1 If the interior temperature is <26℃, the air conditioning controller will be notified via CAN to open the air vents facing the windshield in heating mode. The heat energy of the engine coolant will be used to directly blow hot air to heat the windshield, thereby raising the temperature of the windshield and making it increasingly higher than the dew point temperature inside the vehicle.

[0164] 4.2.2 Heating operation status input detection, that is, receiving and detecting the feedback signal of heating operation status sent by the air conditioner controller to this system via the CAN bus;

[0165] 4.2.3 Determine whether the air conditioner heating is working properly, i.e., whether a feedback signal indicating the heating status is received;

[0166] 4.2.4 If no feedback signal is received, return to step 4.2.2 above;

[0167] If a feedback signal is received, an automatic anti-fog / defog activation success notification will be issued. The notification message includes: displaying on the screen and playing an audio message on the speaker: "Automatic intelligent anti-fog / defog system has been successfully activated." At the same time, the automatic anti-fog / defog status flag SF on the windshield will be valid and set to 1.

[0168] 5. Measurement of windshield sensor parameters, including the temperature inside the windshield, as well as the temperature and relative humidity behind the windshield and inside the vehicle;

[0169] 6. Calculate the dew point temperature of the air inside the vehicle behind the windshield using parameters measured by the windshield sensor.

[0170] 7. Determine whether the windshield has entered the safe zone, i.e., determine whether Tg-ΔT>Tdp holds true. Here, Tg is the temperature of the windshield, Tdp is the dew point temperature of the air inside the vehicle behind the windshield, and ΔT is the safety factor. Based on experimental experience, the value of ΔT in this system is 4.9.

[0171] 8. If the windshield has not entered the safe zone, return to step 5 above;

[0172] If the windshield enters the safe zone, a request to turn off the air conditioning is sent, that is, a signal to the air conditioning controller to request the air conditioning system to be turned off is sent.

[0173] 9. Air conditioner off status input detection, that is, receiving and detecting the feedback signal of the air conditioner controller to this system indicating the off status of the air conditioner system via CAN;

[0174] 10. Determine if the air conditioning system is off. That is, check if a feedback signal indicating the air conditioning system is off has been received.

[0175] 11. If no feedback signal is received, return to step 9 above;

[0176] If a feedback signal is received, the automatic anti-fog / defog status flag SF of the windshield will be cleared to 0.

[0177] 12. Return to step 1 above.

[0178] The specific details of trigger source detection in step 5.2.2 are as follows:

[0179] 1. Detection of anti-fog / defog trigger sources, including manual defog button, automatic anti-fog / defog button, and microphone voice prompt to disable automatic anti-fog / defog request;

[0180] 2. Determine if there is a trigger source for anti-fog / defogging;

[0181] 3. If there is no anti-fog / defog trigger source, return to step 1 above;

[0182] 4. If there is an anti-fog / defog trigger source, then check if SF is equal to 1;

[0183] 4.1.1 If SF=1, then issue a request to turn off the air conditioner.

[0184] 4.1.2, Air Conditioner Off Status Input Detection; that is, receiving and detecting the feedback signal from the air conditioner controller indicating the air conditioner system's off status via CAN.

[0185] 4.1.3 Determine if the air conditioning system is off. That is, whether a feedback signal indicating the air conditioning system is off has been received.

[0186] 4.1.4 If no feedback signal is received, return to step 3.4.2 above;

[0187] 4.1.5 If a feedback signal is received, the automatic anti-fog / defog working status flag SF of the windshield will be cleared to 0;

[0188] 4.1.6, Trigger source output, process ends;

[0189] 5. If SF=0, then check if SR equals 1;

[0190] 5.1.1 If SR=1, then send a request to the vehicle body control unit to turn off the rear defroster.

[0191] 5.1.2 Rear defrost working status input detection; that is, receiving and identifying the feedback signal from the vehicle body control unit to this system regarding the working status of the rear defrost heating equipment;

[0192] 5.1.3 Determine if the post-demisting equipment is working. That is, whether a feedback signal indicating the working status of the post-demisting heating equipment has been received;

[0193] 5.1.4 If no feedback signal is received, return to step 5.1.2 above;

[0194] 5.1.5 If a feedback signal is received, the SR flag of the automatic anti-fog / defog working status of the exterior rearview mirror 3 will be cleared to 0.

[0195] 5.1.6, Trigger source output, process ends;

[0196] 6. If SR=0, the source output is triggered directly, and the process ends.

[0197] Step 6: If the trigger source is determined to be the manual defogging button, then execute the manual defogging sub-process.

[0198] Step 6.1, rear defrosting operation request output, that is, to send a heating request signal for the exterior rearview mirror 3 and the rear windshield heating element to the vehicle body control unit;

[0199] Step 6.2, Rear defrost working status input detection, that is, receiving and identifying the feedback signal of the working status of the rear defrost heating equipment sent to this system by the vehicle body control unit;

[0200] Step 6.3: Determine if the post-demisting equipment is working. That is, whether a feedback signal indicating the working status of the post-demisting heating equipment has been received.

[0201] Step 6.4: If no feedback signal is received, return to step 2 above; if a feedback signal is received, proceed to the next step.

[0202] Step 6.5, detection of anti-fog / defog trigger sources, including manual defog button, automatic anti-fog / defog button, and microphone voice activation of automatic anti-fog / defog request;

[0203] Step 6.6: Determine if there is an anti-fog / defog trigger source;

[0204] Step 6.7: If there is no anti-fog / defog trigger source, return to step 5 above; if there is an anti-fog / defog trigger source, proceed to the next step.

[0205] Step 6.8 If there is an anti-fog / defog trigger source, the defog shutdown request output is sent to the vehicle body control unit, that is, a request signal to shut down the heating of the exterior rearview mirror 3 and the rear windshield heating element is sent.

[0206] Step 6.9, Rear defrost working status input detection, that is, receiving and identifying the feedback signal from the vehicle body control unit to this system regarding the working status of the rear defrost heating equipment;

[0207] Step 6.10: Determine whether the post-demisting equipment is turned off. Specifically, check if a feedback signal indicating the post-demisting heating equipment is off has been received.

[0208] Step 6.11: If no feedback signal is received, return to step 6.9 above.

[0209] If a feedback signal is received, the source output is triggered, and the process ends.

[0210] like Figure 4-5The vehicle-mounted intelligent anti-fog and defogging control system shown includes a car entertainment application processor. The car entertainment application processor is connected to a button detection circuit, a temperature and humidity sensor 1, a car audio processor, a rear defogging request output circuit, a rear defogging status input circuit, a CAN circuit, and a display screen. The button detection circuit is connected to both the manual rear defogging button and the automatic anti-fog / defogging button. The car audio processor is connected to a microphone and a power amplifier. The power amplifier is connected to the vehicle's horn. Both the rear defogging request output circuit and the rear defogging status input circuit are connected to the vehicle control unit. The CAN circuit is connected to the air conditioning controller. Two temperature and humidity sensors 1 are provided; one is located on the inner side of one of the two exterior rearview mirrors 3, and the second is located on the inner side of the upper part of the windshield 2, directly opposite the interior rearview mirror.

[0211] In this invention, the reason for fogging on the windshield is that the temperature of the windshield reaches or falls below the dew point temperature of the air inside the vehicle. In meteorology, the dew point temperature is the temperature at which air becomes saturated under constant water vapor content and pressure, expressed in degrees Celsius (°C) or ℉. Essentially, it is the temperature at which the gaseous water in the air must cool to saturation and condense into liquid water.

[0212] Therefore, to determine whether the windshield has entered a high-risk fogging state, the system needs to know the temperature of the windshield and the dew point temperature of the air inside the vehicle. Similarly, to determine whether the exterior rearview mirrors have entered a high-risk fogging state, the system needs to know the temperature of the exterior rearview mirrors and the dew point temperature of the air outside the vehicle behind the mirrors.

[0213] Dew point temperature is calculated using a formula inverse method. According to the 2004 edition of the "Ground Meteorological Observation Specifications," dew point temperature is measured using a transformed form of the Maglas formula. Since there is no direct formula for calculating dew point temperature, it is obtained by inverse calculation using the saturated vapor pressure formula. The Maglas formula is an approximation of the Goff-Gratch formula and is also an empirical formula. The Maglas formula is as follows:

[0214]

[0215] (1)

[0216] Where T is temperature, RH is relative humidity, and a, b, and c are constants. In the journal *Applied Meteorology and Climatology*, Arden Buck proposed an estimate of these constants:

[0217] a=6.1121 mb, b=17.368, c=238.88 ℃; for 0 ℃≤ T ≤50 ℃ (error ≤0.05%);

[0218] a=6.1121 mb, b=17.966, c=247.15 ℃; for -40 ℃≤ T ≤0 ℃ (error ≤0.06%).

[0219] Therefore, to calculate the dew point temperature of the air inside the vehicle, it is necessary to measure the temperature (T) and relative humidity (RH) of the air inside the vehicle; to calculate the dew point temperature of the air outside the vehicle behind the rearview mirror, it is necessary to measure the temperature (T) and relative humidity (RH) of the air behind the rearview mirror.

[0220] The manual rear defroster button is located near the vehicle's air conditioning control panel and is used by the driver to manually start and stop the traditional rear defroster function. Currently, the manual defroster button on most cars on the market only functions to defroster the rear windshield and exterior rearview mirrors.

[0221] The automatic anti-fog / defog button is installed near the vehicle's air conditioning control panel and is used to receive the driver's input to activate or deactivate the automatic anti-fog / defog function. The automatic anti-fog / defog function designed for this system includes anti-fog / defog for the windshield 2, rear windshield and exterior rearview mirrors 3.

[0222] The button detection circuit is used to detect the manual defrost button and the automatic defrost button respectively; when a button action is detected, the corresponding button information is converted into a level signal that can be recognized by the car and infotainment application processor.

[0223] The microphone converts sound signals into electrical signals for voice recognition, enabling the driver to activate or deactivate the automatic anti-fog / defog function; this includes anti-fog / defog functions for the windshield 2, rear windshield, and exterior rearview mirrors 3.

[0224] The automotive audio processor is used to convert the analog signals input from the microphone into digital signals required by the automotive and infotainment application processors; it is also used to process the system sounds (including defrost status prompts, etc.) output by the automotive and infotainment application processors, including scales, sound effects, and mixing, and then convert them into analog audio signals for output to the power amplifier.

[0225] A power amplifier is used to amplify the audio output from the car's audio processor to drive the speakers;

[0226] The vehicle horn is used to convert the electrical signal output from the power amplifier into an audio signal to play various audio sources of the system (including defrost status prompts, etc.).

[0227] The windshield 2 temperature and humidity sensor 1 is used to measure the temperature inside the windshield 2, as well as the temperature and relative humidity behind the windshield 2 and inside the vehicle. Installation location: It can be installed behind the rearview mirror inside the vehicle, close to the windshield 2 inside the vehicle.

[0228] The temperature and humidity sensor 1 of the exterior rearview mirror 3 is used to measure the temperature of the glass of the exterior rearview mirror 3, as well as the temperature and relative humidity behind the exterior rearview mirror 3 and outside the vehicle. Since the temperature and humidity on both sides outside the vehicle are basically the same, the temperature and humidity sensor is only installed in the inner corner of one of the exterior rearview mirrors 3, close to the glass of the exterior rearview mirror 3;

[0229] The windshield temperature and humidity sensor 2 and the exterior rearview mirror temperature and humidity sensor 3 should be installed in positions that do not obstruct the driver's view. An installation diagram is attached. Figure 2 As shown.

[0230] The rear defroster operation request output circuit is used to output a request signal to the vehicle body control unit to open or close the exterior rearview mirrors 3 and the rear windshield heating.

[0231] The rear defroster operating status input circuit is used to receive and identify the feedback signal of the rear defroster heating operating status issued by the vehicle control unit and transmit it to the vehicle and infotainment application processor.

[0232] The CAN circuit is used for communication between the system and the air conditioning controller to obtain information from the air conditioning controller and control the working status of the air conditioning controller to start and stop the windshield 2 anti-fog / defogger.

[0233] A TFT-LCD display screen is used for displaying the system's UI (human-machine interface), including the current defogging status and other information.

[0234] The automotive and infotainment application processor, acting as the system's "brain," is responsible for detecting and processing manual and automatic defogging button requests; processing driver input via microphone requests to activate or deactivate automatic defogging / defogging; receiving temperature and humidity information from sensors and performing calculations and analysis; sending signals to the body control unit to activate or deactivate the rear defogging heating; receiving feedback signals from the body control unit regarding the rear defogging heating's operating status; communicating with the air conditioning controller via CAN to control its operation; outputting audio sources such as defogging status alerts; and displaying the current defogging status on the user interface.

[0235] This invention features a simple system structure that effectively strengthens the connection between the central control system and the air conditioning controller. Without increasing other costs, it helps determine the necessity and timing of defogging / defogging the windshield 2 and exterior rearview mirrors 3. The intelligent defogging system is activated in advance before the windshield 2 and exterior rearview mirrors 3 reach a high-risk fogging state, preventing fogging and ensuring driving safety. The automatic defogging / defogging system not only protects the lives of people inside the vehicle but also saves energy, playing a crucial role in fuel efficiency.

[0236] Before the windshield 2 and the exterior rearview mirror 3 fog up, the system can determine whether the windshield 2 and the exterior rearview mirror 3 have entered a high-risk fogging state based on environmental conditions, and thus activate the intelligent anti-fog system in advance to make the windshield 2 and the exterior rearview mirror 3 safe and prevent fogging, ensuring driving safety.

[0237] Meanwhile, considering the shortcomings of manual defogging, this invention allows for voice activation or one-button activation of the automatic defogging / defogging system, simplifying operation. This avoids frequent and accidental operation of the defogging button and HVAC system by the driver, thus ensuring the safety of occupants. It also prevents drivers from leaving the HVAC system on at inappropriate times, reducing energy waste. Simultaneously, considering personal habits, it retains the traditional manual defogging button function without interfering with other systems.

[0238] This invention is not limited to the above embodiments. Based on the technical solutions disclosed herein, those skilled in the art can make some substitutions and modifications to some of the technical features without creative effort, and all such substitutions and modifications are within the protection scope of this invention.

Claims

1. A vehicle-mounted intelligent anti-fog and defogging control method with manual / automatic operation, characterized in that: The method comprises the following steps, Step 1, parameter initialization, the automatic anti-fog / defogging reminder times counter C is set to 0; Step 2, anti-fog / defogging trigger source detection, including manual rear defogging button, automatic anti-fog / defogging button, microphone voice opening automatic anti-fog / defogging application; Step 3, no anti-fog / defogging trigger source is detected; Step 4, if the anti-fog / defogging trigger source is detected, it is distinguished whether the trigger source is a manual defogging application or an automatic anti-fog / defogging application; Step 5, if it is determined to be an automatic anti-fog / defogging application, an automatic anti-fog / defogging working sub-process is executed; Step 6, if it is determined that the trigger source is a manual defogging button, a manual defogging working sub-process is executed; In step 5, the following contents are included, Step 5.1, if the trigger source is an automatic anti-fog / defogging button or voice opening automatic anti-fog / defogging, the process is jumped to the automatic anti-fog / defogging working sub-process; Step 5.2, the automatic anti-fog / defogging working sub-process is executed; The method comprises the following steps, The method comprises the following steps, Step 5.2.1, parameter initialization, the front windshield automatic anti-fog / defogging working state flag SF and the outside rearview mirror automatic anti-fog / defogging working state flag SR are respectively set to 0; Step 5.2.2, the front windshield and the outside rearview mirror are synchronously monitored, and according to environmental parameters, the following steps are respectively performed; meanwhile, the anti-fog / defogging trigger source is monitored, if there is a trigger source, the trigger source is outputted, and the process is ended; The specific contents of the front windshield automatic anti-fog / defogging in step 5.2.2 are as follows, 1, front windshield sensor parameter measurement, including the temperature of the front windshield in the vehicle, and the temperature and relative humidity of the air behind the front windshield in the vehicle; 2, the dew point temperature of the air behind the front windshield in the vehicle is calculated through the front windshield sensor measured parameters; 3, whether the front windshield enters a high risk area of fogging is judged, that is, whether Tg-Tth≤Tdp is established, wherein Tg is the temperature of the front windshield, Tdp is the dew point temperature of the air behind the front windshield in the vehicle, and Tth is a risk margin, and according to experimental experience value, Tth is 1.45; 4, if the front windshield does not enter the high risk area of fogging, the first step is returned to; ​ ​ ​ If the windshield enters the high-risk zone for fogging, proceed to the next step to determine if the interior temperature is ≥26℃. 4.1.1 If the interior temperature is ≥26℃, the air conditioning controller will be notified via CAN to open the air vents facing the windshield, turn on the air conditioning HVAC system, turn on the compressor, and set it to external circulation and cooling mode. This will rapidly reduce the relative humidity and temperature inside the vehicle, thereby lowering the dew point temperature inside the vehicle, making the dew point temperature inside the vehicle increasingly lower than the temperature of the windshield. 4.1.2, Cooling and dehumidification working status input detection, that is, receiving and detecting the feedback signal of cooling and dehumidification working status sent by the air conditioner controller to this system via CAN bus; 4.1.3 Determine whether the air conditioner's cooling and dehumidification functions are working properly, i.e., whether a feedback signal indicating the working status of the cooling and dehumidification functions is received; 4.1.4 If no feedback signal is received, return to step 4.1.2 above; If a feedback signal is received, an automatic anti-fog / defog activation success notification will be issued. The notification message includes: displaying on the screen and playing an audio message on the speaker: "Automatic intelligent anti-fog / defog system has been successfully activated." At the same time, the automatic anti-fog / defog status flag SF on the windshield will be valid and set to 1. 4.2.1 If the interior temperature is <26℃, the air conditioning controller will be notified via CAN to open the air vents facing the windshield in heating mode. The heat energy of the engine coolant will be used to directly blow hot air to heat the windshield, thereby raising the temperature of the windshield and making it increasingly higher than the dew point temperature inside the vehicle. 4.2.2 Heating operation status input detection, that is, receiving and detecting the feedback signal of heating operation status sent by the air conditioner controller to this system via the CAN bus; 4.2.3 Determine whether the air conditioner heating is working properly, i.e., whether a feedback signal indicating the heating status is received; 4.2.4 If no feedback signal is received, return to step 4.2.2 above; If a feedback signal is received, an automatic anti-fog / defog activation success notification will be issued. The notification message includes: displaying on the screen and playing an audio message on the speaker: "Automatic intelligent anti-fog / defog system has been successfully activated." At the same time, the automatic anti-fog / defog status flag SF on the windshield will be valid and set to 1.

5. Measurement of windshield sensor parameters, including the temperature inside the windshield, as well as the temperature and relative humidity behind the windshield and inside the vehicle; 6. Calculate the dew point temperature of the air inside the vehicle behind the windshield using parameters measured by the windshield sensor.

7. Determine whether the windshield has entered the safe zone, i.e., determine whether Tg-ΔT>Tdp holds true. Here, Tg is the temperature of the windshield, Tdp is the dew point temperature of the air inside the vehicle behind the windshield, and ΔT is the safety factor. Based on experimental experience, the value of ΔT in this system is 4.

9.

8. If the windshield has not entered the safe zone, return to step 5 above; If the windshield enters the safe zone, a request to turn off the air conditioning is sent, that is, a signal to the air conditioning controller to request the air conditioning system to be turned off is sent.

9. Air conditioner off status input detection, that is, receiving and detecting the feedback signal of the air conditioner controller to this system indicating the off status of the air conditioner system via CAN; 10. Determine whether the air conditioning system is off, i.e., whether a feedback signal indicating that the air conditioning system is off has been received; 11. If no feedback signal is received, return to step 9 above; If a feedback signal is received, the automatic anti-fog / defog status flag SF of the windshield will be cleared to 0.

12. Return to step 1 above; The specific details of trigger source detection in step 5.2.2 are as follows:

1. Detection of anti-fog / defog trigger sources, including manual defog button, automatic anti-fog / defog button, and microphone voice prompt to disable automatic anti-fog / defog request; 2. Determine if there is a trigger for anti-fog / defogging; 3. If there is no anti-fog / defog trigger source, return to step 1 above; 4. If there is an anti-fog / defog trigger source, then determine whether SF is equal to 1; 4.1.1 If SF=1, then issue a request to turn off the air conditioner. 4.1.2, Air Conditioner Off Status Input Detection; that is, receiving and detecting the feedback signal from the air conditioner controller indicating the air conditioner system's off status via CAN. 4.1.3 Determine whether the air conditioning system is off, i.e., whether a feedback signal indicating that the air conditioning system is off has been received; 4.1.4 If no feedback signal is received, return to step 3.4.2 above; 4.1.5 If a feedback signal is received, the automatic anti-fog / defog working status flag SF of the windshield will be cleared to 0; 4.1.6, Trigger source output, process ends; 5. If SF=0, then check if SR equals 1; 5.1.1 If SR=1, then send a request to the vehicle body control unit to turn off the rear defroster. 5.1.2 Rear defrost working status input detection; that is, receiving and identifying the feedback signal from the vehicle body control unit to this system regarding the working status of the rear defrost heating equipment; 5.1.3 Determine whether the post-demisting equipment is working, i.e., whether a feedback signal indicating the working status of the post-demisting heating equipment has been received; 5.1.4 If no feedback signal is received, return to step 5.1.2 above; 5.1.5 If a feedback signal is received, the SR flag for the automatic anti-fog / defog operation status of the exterior rearview mirror will be cleared to 0. 5.1.6, Trigger source output, process ends; 6. If SR=0, the source output is triggered directly, and the process ends.

2. The vehicle-mounted automatic transmission intelligent anti-fog and defogging control method according to claim 1, characterized in that: The specific details of step 3 are as follows: Step 3.1: Use the windshield temperature and humidity sensor and the exterior rearview mirror temperature and humidity sensor to measure and collect the temperature of the corresponding glass, as well as the ambient temperature and relative humidity data. Step 3.2: Calculate and analyze the dew point temperature of the air inside the passenger compartment and the dew point temperature of the air outside the vehicle behind the rearview mirror. Step 3.3: Determine whether the windshield and exterior rearview mirrors have entered the high-risk fogging zone. Because fog will appear when the glass temperature Tg reaches or falls below the dew point temperature Tdp (i.e., Tg≤Tdp). To determine whether the vehicle has entered the high-risk fogging zone, a certain margin Tth needs to be reserved, also known as the risk margin. Therefore, when Tg-Tth≤Tdp, the vehicle is determined to have entered the high-risk fogging zone. Considering both accurate fog prevention and energy saving, Tth is set to 1.45 based on experimental experience. Step 3.4: If the corresponding glass does not enter the high-risk area for fogging, return to Step 2. If the corresponding glass enters a high-risk fogging zone, the automatic anti-fog / defog reminder counter C+1; if C≤3, meaning the reminder count does not exceed 3 times, an anti-fog / defog reminder is issued; the reminder message includes: displayed on the screen and played on the speaker: "There is a risk of fogging on the windshield or exterior rearview mirrors. Please turn on automatic intelligent anti-fog / defog." After the reminder is completed, return to step 2; if C>3, meaning the reminder count exceeds 3 times, C is set to 3, the reminder stops, and return to step 2.

3. The vehicle-mounted automatic transmission intelligent anti-fog and defogging control method according to claim 2, characterized in that: The specific details of the automatic anti-fog / defog function of the vehicle's exterior rearview mirrors in step 5.2.2 are as follows:

1. Measurement of sensor parameters for exterior rearview mirrors, including the temperature of the exterior rearview mirror glass, and the temperature and relative humidity of the air behind the exterior rearview mirror; 2. Calculate the dew point temperature of the air behind the vehicle's exterior rearview mirror using parameters measured by the exterior rearview mirror sensor; 3. Determine whether the exterior rearview mirror glass has entered the high-risk area of ​​fogging; that is, determine whether Tg-Tth≤Tdp holds true, where Tg is the temperature of the exterior rearview mirror glass, Tdp is the dew point temperature of the air behind the exterior rearview mirror, and Tth is the risk margin. Based on experimental experience, the value of Tth in this system is 1.

45.

4. If the glass of the exterior rearview mirror has not entered the high-risk area for fogging, return to step 1 above; If the glass of the exterior rearview mirror enters the high-risk area for fogging, a rear defrosting request output is sent, that is, a heating request signal for the heating wires of the exterior rearview mirror and the rear windshield is sent to the vehicle control unit.

5. Rear defrost working status input detection, that is, receiving and identifying feedback signals from the vehicle body control unit regarding the working status of the rear defrost heating equipment; 6. Determine whether the post-demisting equipment is working, i.e. whether a feedback signal on the working status of the post-demisting heating equipment has been received; 7. If no feedback signal is received, return to the above 5 steps; If a feedback signal is received, an automatic anti-fog / defogger activation success notification will be issued. The notification message includes: displaying on the screen and playing an audio message on the speaker: "Automatic intelligent anti-fog / defogger system has been successfully activated"; at the same time, the automatic anti-fog / defogger status indicator SR on the exterior rearview mirror will be valid and set to 1.

8. Measurement of exterior rearview mirror sensor parameters, including the temperature of the exterior rearview mirror glass, and the temperature and relative humidity of the air behind the exterior rearview mirror; 9. Calculate the dew point temperature of the air behind the vehicle's exterior rearview mirror using parameters measured by the exterior rearview mirror sensor; 10. Determine whether the exterior rearview mirror glass has entered the safe zone; to determine whether the glass has entered the safe zone, we need to determine whether Tg-ΔT>Tdp holds true, where Tg is the temperature of the exterior rearview mirror glass, Tdp is the dew point temperature of the air behind the exterior rearview mirror, and ΔT is the safety factor; the safety factor ΔT is 4.

9.

11. If the glass of the exterior rearview mirror does not enter the safe zone, return to step 8 above; If the glass of the exterior rearview mirror enters the safe zone, a request to turn off the rear defroster is sent; that is, a request signal to the vehicle body control unit is sent to turn off the heating of the exterior rearview mirror and rear windshield heating wires.

12. Rear defrost working status input detection, that is, receiving and identifying the feedback signal from the vehicle body control unit to this system regarding the working status of the rear defrost heating equipment; 13. Determine whether the post-demisting equipment is turned off, i.e., whether a feedback signal indicating the post-demisting heating equipment is off has been received; 14. If no feedback signal is received, return to step 12 above; If a feedback signal is received, the SR flag for the automatic anti-fog / defog status of the exterior rearview mirror will be cleared to 0.

15. Return to step 1 above.

4. The vehicle-mounted automatic transmission intelligent anti-fog and defogging control method according to claim 3, characterized in that: The specific steps for manually defogging / defogging in step 6 are as follows: Step 6.1, Rear defrosting operation request output, that is, to send a heating request signal for the exterior rearview mirror and rear windshield heating element to the vehicle body control unit; Step 6.2, Rear defrost working status input detection, that is, receiving and identifying the feedback signal of the working status of the rear defrost heating equipment sent to this system by the vehicle body control unit; Step 6.3: Determine whether the post-demisting equipment is working, i.e., whether a feedback signal indicating the working status of the post-demisting heating equipment has been received; Step 6.4: If no feedback signal is received, return to step 2 above; if a feedback signal is received, proceed to the next step. Step 6.5, detection of anti-fog / defog trigger sources, including manual defog button, automatic anti-fog / defog button, and microphone voice activation of automatic anti-fog / defog request; Step 6.6: Determine if there is an anti-fog / defog trigger source; Step 6.7: If there is no anti-fog / defog trigger source, return to step 5 above; if there is an anti-fog / defog trigger source, proceed to the next step. Step 6.8 If there is an anti-fog / defog trigger source, the rear defogger will be turned off, that is, a request signal to the vehicle body control unit will be sent to turn off the heating of the exterior rearview mirror and the rear windshield heating wire. Step 6.9, Rear defrost working status input detection, that is, receiving and identifying the feedback signal from the vehicle body control unit to this system regarding the working status of the rear defrost heating equipment; Step 6.10: Determine whether the post-demisting equipment is turned off, i.e., whether a feedback signal indicating that the post-demisting heating equipment is off has been received; Step 6.11: If no feedback signal is received, return to step 6.9 above; If a feedback signal is received, the source output is triggered, and the process ends.

5. A vehicle-mounted automatic and manual intelligent anti-fog and defogging control system, characterized in that: The vehicle-mounted intelligent anti-fog and defogging control method according to any one of claims 1-4 includes an automotive entertainment application processor. The automotive entertainment application processor is connected to a button detection circuit, a temperature and humidity sensor, an automotive audio processor, a rear defogging operation request output circuit, a rear defogging operation status input circuit, a CAN circuit, and a display screen. The button detection circuit is connected to the manual rear defogging button and the automatic anti-fog / defogging button. The automotive audio processor is connected to a microphone and a power amplifier. The power amplifier is connected to the vehicle horn. The rear defogging operation request output circuit and the rear defogging operation status input circuit are both connected to the vehicle control unit. The CAN circuit is connected to the air conditioning controller.

6. The vehicle-mounted automatic transmission intelligent anti-fog and defogging control system according to claim 5, characterized in that, There are two temperature and humidity sensors. One is located on the inside of the glass of one of the two exterior rearview mirrors, and the second is located on the inside of the upper part of the windshield, directly opposite the interior rearview mirror.

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