Automatic defrosting and demisting method and system

Abstract

The invention belongs to the technical field of automobile demisting, and particularly relates to an automatic defrosting and demisting method and system.The automatic defrosting and demisting method comprises the following steps that S1, the temperature Tw of a windshield is obtained through a windshield temperature sensor, and data are transmitted to an MCU in real time; s2, a temperature sensor in the compartment is used for obtaining the temperature Ti in the compartment, and data are transmitted to the MCU in real time; s3, the relative humidity RH in the compartment is obtained through a humidity sensor in the compartment, and data are transmitted to the MCU in real time; and S4, the MCU calculates the dew point temperature Td in the carriage through a formula Td = Ti-according to the temperature Ti and the relative humidity RH in the carriage. According to the automatic defrosting and demisting method and system, a unique dew-point temperature calculation formula is adopted, the influence of the temperature and the relative humidity in the compartment on the dew-point temperature is fully considered, and compared with the prior art, the dew-point temperature can be calculated more accurately, so that whether the windshield fogs or not is judged more accurately; and a reliable basis is provided for timely starting a demisting measure.

Description

Technical Field

[0001] The invention relates to the technical field of automobile defogger, in particular to an automatic defrosting and defogger method and system. Background Art

[0002] With the rapid development of the automobile industry, the safety performance and comfort of automobiles have attracted more and more attention from consumers. Among the many factors that affect driving experience and safety, the defrosting and defogging function of car windows is very important.

[0003] At present, most cars are equipped with a windshield defogger, but the existing technology has obvious defects. The traditional defogger usually sets a physical button, which requires the driver to manually start the air conditioning system. However, the driver often operates after the window glass has fogged up and affects the line of sight, which to a certain extent brings safety hazards to driving. Even if the defogger function is started, the defogger effect is not obvious at the beginning, and it takes some time to work. Although some automatic defogger systems of cars can detect the temperature and relative humidity in the car compartment, calculate the dew point temperature and compare it with the window glass temperature, and then automatically control the window glass heating module and air conditioning system, these systems still have some shortcomings. On the one hand, in the process of calculating the dew point temperature and judging whether to defrost and defog, the influence of various environmental factors may not be fully considered, resulting in inaccurate judgment and poor defrosting and defogger effect. On the other hand, the monitoring and feedback mechanism of the defrosting and defogger process is not perfect, and the defrosting and defogger strategy cannot be adjusted in time according to the actual situation, and it is difficult to ensure the effectiveness of the operation. In view of this, an automatic defrosting and defogger method and system are proposed. Summary of the invention

[0004] The main purpose of the present invention is to provide a method and system for automatic defrosting and defogger, which can solve the problems raised in the above background technology.

[0005] To achieve the above object, the automatic defrosting and defogging method for an automobile proposed by the present invention comprises the following steps:

[0006] S1, using the windshield temperature sensor to obtain the windshield temperature Tw, and transmit the data to the MCU in real time;

[0007] S2, using the temperature sensor in the car to obtain the temperature Ti in the car, and transmit the data to the MCU in real time;

[0008] S3, using the humidity sensor in the car to obtain the relative humidity RH in the car, and transmit the data to the MCU in real time;

[0009] S4, MCU according to the temperature Ti and relative humidity RH in the car through the formula Calculate the dew point temperature Td in the car;

[0010] S5. The MCU compares the dew point temperature Td with the windshield temperature Tw, and combines with the safety factor x. When Td + x ≥ Tw, it controls the window glass heating module to heat the window glass; when the relative humidity RH inside the vehicle compartment is higher than the set value k, it controls the air conditioning system to turn on the external air circulation of the vehicle.

[0011] S6. During the operation of the window glass heating module and the air conditioning system, the MCU continuously receives sensor data. When Td + x < Tw, it controls the window glass heating module to stop working; when the relative humidity RH inside the vehicle compartment is less than the fixed value k, it controls the air conditioning system to close the external circulation.

[0012] Preferably, when frost is detected, a heater is used to heat the window or a windshield defroster is used to spray hot air or warm liquid on the window for defrosting; when fogging is detected, a windshield defogger is used to spray hot air or warm liquid on the window, or the air conditioning system is started to adjust the humidity inside the vehicle for defogging; during the defrosting or defogging process, the corresponding temperature and humidity changes are monitored in real time. If the preset termination condition is reached, the corresponding processing operation is stopped.

[0013] Preferably, the safety factor x and the set value k can be adjusted through an input device. The input device is a physical button or a function module integrated in the vehicle instrument or the central control display screen. And after receiving the adjustment instruction, the input device will transmit the instruction to the MCU accurately in the form of a digital signal, and the MCU will precisely adjust the safety factor x and the set value k according to this digital signal.

[0014] Preferably, after the MCU calculates the dew point temperature Td inside the vehicle compartment, it will perform error verification on the calculation result. If the deviation between the calculated dew point temperature Td and the historical calculation result exceeds the preset error range, it will re-collect the data of the temperature Ti and relative humidity RH inside the vehicle compartment and calculate again.

[0015] An automatic defrosting and defogging system, comprising:

[0016] A sensor module, including a windshield temperature sensor installed on the windshield, an in-vehicle temperature sensor and an in-vehicle humidity sensor installed at the same position inside the vehicle compartment, for collecting the windshield temperature Tw, the in-vehicle temperature Ti and the in-vehicle relative humidity RH;

[0017] An MCU, which is connected to the sensor module, for receiving the data collected by the sensors, calculating the dew point temperature Td inside the vehicle compartment according to the formula and controlling the working states of the window glass heating module and the air conditioning system according to Td, Tw, RH, as well as the safety factor x and the set value k;

[0018] The window glass heating module heats the window glass under the control of the MCU;

[0019] The air conditioning system adjusts the humidity inside the car under the control of the MCU;

[0020] The input device is connected to the MCU and is used to input signals for adjusting the safety factor x and the set value k to the MCU.

[0021] Preferably, the installation position of the windshield temperature sensor does not affect the driver's field of vision, the cabin temperature sensor and the cabin humidity sensor are installed at a position close to the window temperature sensor and do not affect the operation of other wiring harnesses and equipment in the car, and the sensor module has a self-diagnosis function. If a sensor failure is detected, a fault signal will be immediately sent to the MCU, and the status information of the sensor will be displayed on the vehicle display screen to remind the user to deal with it in time.

[0022] Preferably, the system also includes a vehicle-mounted control panel or mobile phone APP for controlling the turning on and off of the defrost and defogger functions, and a monitoring module for monitoring the defrost and defogger process and results. The monitoring module will record various parameters in the defrost and defogger process in real time, such as temperature, humidity change curves, etc., and store these data in the system's memory for subsequent analysis and viewing.

[0023] Preferably, the MCU also has a learning function, which can automatically adjust the default values ​​of the safety factor x and the set value k according to the historical data of multiple defrosting and defogger operations. For example, when the defrosting and defogger effects are poor multiple times under certain environmental conditions, the MCU will automatically optimize the corresponding parameter settings to improve the system's adaptability and defrosting and defogger efficiency.

[0024] Preferably, the window glass heating module adopts zone heating technology, and the MCU can independently control the heating power of each zone according to the temperature conditions of different areas of the windshield. For example, when the temperature of a certain area of ​​the windshield is significantly lower than that of other areas, the MCU will increase the heating power of that area, thereby achieving defrosting and defogger more efficiently.

[0025] Preferably, when adjusting the humidity in the car, the air-conditioning system will make intelligent adjustments based on the number of people in the car. The system can estimate the number of people through seat pressure sensors or camera recognition technology in the car. When the number of people is large, the dehumidification efficiency of the air-conditioning system will be appropriately increased to ensure that the humidity in the car can be quickly reduced to an appropriate range.

[0026] The present invention provides a method and system for automatic defrosting and defogging, which has the following beneficial effects:

[0027] (1) The automatic defrosting and defogging method and system adopts a unique dew point temperature calculation formula, which fully considers the influence of the temperature and relative humidity in the vehicle cabin on the dew point temperature. Compared with the existing technology, it can calculate the dew point temperature more accurately, thereby more accurately judging whether the windshield will fog up, providing a reliable basis for timely initiating defog measures.

[0028] (2) The automatic defrosting and defogging method and system can provide a variety of defrosting and defogging methods, and perform intelligent control based on sensor data through the MCU. During the defrosting and defogging process, the sensor data is continuously monitored and the defrosting and defogging strategy is adjusted in real time to ensure the defrosting and defogging effect while achieving energy saving and avoiding unnecessary energy waste.

[0029] (3) The automatic defrosting and defogging method and system are provided with an adjustable safety factor x and humidity threshold k. The user can adjust the system startup sensitivity through the input device according to actual needs, thereby improving the adaptability and personalization of the system and meeting the usage needs of different users in different environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0031] Figure 1 This is an overall flow chart of the automatic defrosting and defogging method for an automobile of the present invention;

[0032] Figure 2 This is a control flow chart of the vehicle window glass heating module and the air conditioning system of the present invention;

[0033] Figure 3 It is a block diagram of the overall system architecture of the present invention;

[0034] Figure 4 The sensor module and fault handling block diagram of the present invention;

[0035] Figure 5 This is a functional block diagram of the MCU intelligent control and learning of the present invention.

[0036] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0038] Please refer to Figure 1-Figure 5 , the present invention proposes an automatic defrosting and defogging method for an automobile, including the following steps:

[0039] S1. Use the windshield temperature sensor to obtain the temperature Tw of the windshield and transmit the data to the MCU in real time;

[0040] S2. Use the in-vehicle temperature sensor to obtain the temperature Ti in the vehicle compartment and transmit the data to the MCU in real time;

[0041] S3. Use the in-vehicle humidity sensor to obtain the relative humidity RH in the vehicle compartment and transmit the data to the MCU in real time;

[0042] S4. The MCU calculates the dew point temperature Td in the vehicle compartment according to the temperature Ti and relative humidity RH in the vehicle compartment through the formula ;

[0043] S5. The MCU compares the dew point temperature Td with the windshield temperature Tw and combines with the safety factor x. When Td + x ≥ Tw, control the window glass heating module to heat the window glass; when the relative humidity RH in the vehicle compartment is higher than the set value k, control the air conditioning system to turn on the external air circulation of the vehicle;

[0044] S6. During the operation of the window glass heating module and the air conditioning system, the MCU continuously receives sensor data. When Td + x < Tw, control the window glass heating module to stop working; when the relative humidity RH in the vehicle compartment is less than the fixed value k, control the air conditioning system to close the external circulation.

[0045] The defrosting and defogging method of the present invention: First, the sensor module collects data in real time. The windshield temperature sensor sends the detected windshield temperature Tw to the MCU in real time; the in-vehicle temperature sensor sends the in-vehicle temperature Ti to the MCU in real time; the in-vehicle humidity sensor sends the in-vehicle relative humidity RH to the MCU in real time. Then, the MCU calculates the dew point temperature Td in the vehicle compartment according to the received in-vehicle temperature Ti and relative humidity RH by using the formula where Td is the dew point temperature in the vehicle compartment, Ti is the in-vehicle temperature, and RH is the in-vehicle relative humidity. This formula is derived based on the relationship between humidity and dew point temperature and is verified by a large amount of experimental data, and can calculate the dew point temperature more accurately.

[0046] Next, the MCU compares the calculated dew point temperature Td with the windshield temperature Tw and makes a judgment in combination with the safety factor x (adjustable). When Td + x ≥ Tw, it indicates that the windshield may fog up. At this time, the MCU controls the window glass heating module to heat the window glass. When the relative humidity RH inside the vehicle compartment is higher than the set value k (adjustable), the MCU controls the air conditioning system to turn on the external air circulation of the vehicle to reduce the humidity inside the vehicle compartment. During the operation of the window glass heating module and the vehicle air conditioning system, the MCU continuously receives the information of the three sensors and performs calculation and analysis. When Td + x < Tw, the MCU controls the window glass heating module to stop working; when the relative humidity RH inside the vehicle compartment is less than the fixed value k, the MCU turns off the external circulation of the air conditioning system.

[0047] Furthermore, when frost is detected, a heater is used to heat the window or a windshield defroster is used to spray hot air or warm liquid onto the window for defrosting; when fog is detected, a windshield defogger is used to spray hot air or warm liquid onto the window, or the air conditioning system is started to adjust the humidity inside the vehicle for defogging; during the defrosting or defogging process, the corresponding temperature and humidity changes are monitored in real time. If the preset termination condition is reached, the corresponding processing operation is stopped.

[0048] Furthermore, the safety factor x and the set value k can be adjusted through an input device. The input device is a physical button or a functional module integrated in the vehicle instrument or the central control display screen. And after receiving the adjustment instruction, the input device will accurately transmit the instruction to the MCU in the form of a digital signal, and the MCU precisely adjusts the safety factor x and the set value k according to this digital signal.

[0049] Furthermore, after the MCU calculates the dew point temperature Td inside the vehicle compartment, it will perform error verification on the calculation result. If the deviation between the calculated dew point temperature Td and the historical calculation result exceeds the preset error range, the data of the temperature Ti and relative humidity RH inside the vehicle compartment will be re-collected and calculated again.

[0050] The present invention proposes an automatic defrosting and defogging system, including:

[0051] The sensor module includes a windshield temperature sensor installed on the windshield, a cabin temperature sensor and a cabin humidity sensor installed at the same position in the cabin, which are used to collect the windshield temperature Tw, the cabin temperature Ti and the cabin relative humidity RH; wherein the installation position of the windshield temperature sensor does not affect the driver's field of view, the cabin temperature sensor and the cabin humidity sensor are installed at a position close to the window temperature sensor and do not affect the operation of other wiring harnesses and equipment in the vehicle, and the sensor module has a self-diagnosis function. If a sensor failure is detected, a fault signal will be sent to the MCU immediately, and the status information of the sensor will be displayed on the vehicle display screen to remind the user to deal with it in time.

[0052] MCU, which is connected to the sensor module and is used to receive data collected by the sensor. Calculate the dew point temperature Td in the cabin, and control the working status of the window glass heating module and the air conditioning system according to Td, Tw, RH, safety factor x, and set value k. The MCU also has a learning function, which can automatically adjust the default values ​​of the safety factor x and set value k according to the historical data of multiple defrosting and defogging operations. The window glass heating module adopts zone heating technology, and the MCU can independently control the heating power of each zone according to the temperature of different zones of the windshield;

[0053] The window glass heating module heats the window glass under the control of the MCU;

[0054] The air conditioning system adjusts the humidity in the car under the control of the MCU. When adjusting the humidity in the car, the air conditioning system will make intelligent adjustments based on the number of people in the car. The system can estimate the number of people through the seat pressure sensor or camera recognition technology in the car. When the number of people is large, the dehumidification efficiency of the air conditioning system is appropriately increased to ensure that the humidity in the car can be quickly reduced to an appropriate range;

[0055] The input device is connected to the MCU and is used to input signals for adjusting the safety factor x and the set value k to the MCU.

[0056] Furthermore, the system also includes a vehicle-mounted control panel or mobile phone APP for controlling the opening and closing of the defrost and defogger functions, and a monitoring module for monitoring the defrost and defogger process and results. The monitoring module will record various parameters in the defrost and defogger process in real time, such as temperature, humidity change curves, etc., and store these data in the system's memory for subsequent analysis and viewing.

[0057] In the embodiment of the present invention, during the production or modification of the automobile, the windshield temperature sensor is installed at a suitable position of the windshield according to the design requirements to ensure that it does not affect the driver's field of vision, and the cabin temperature sensor and cabin humidity sensor are installed at the same position close to the window temperature sensor and do not affect the operation of other wiring harnesses and equipment in the car. Connect each sensor to the MCU, and the MCU to the window glass heating module, air conditioning system and input device to ensure that the line connection is correct. After the installation is completed, debug the system to check whether each sensor can collect data normally, whether the MCU can accurately receive and process data, and whether the window glass heating module and air conditioning system can work normally under the control of the MCU.

[0058] The present invention adopts a unique dew point temperature calculation formula, which fully considers the influence of the temperature and relative humidity in the vehicle cabin on the dew point temperature. Compared with the prior art, the present invention can calculate the dew point temperature more accurately, thereby more accurately judging whether the windshield will fog up, and providing a reliable basis for timely starting defog measures. At the same time, the MCU performs intelligent control according to the sensor data. During the defrosting and defogging process, the sensor data is continuously monitored, and the defrosting and defogging strategy is adjusted in real time to ensure the defrosting and defogging effect while achieving the energy-saving purpose and avoiding unnecessary energy waste. In addition, through the adjustable safety factor x and humidity threshold k, the user can adjust the system startup sensitivity through the input device according to actual needs, thereby improving the adaptability and personalization of the system and meeting the usage needs of different users in different environments.

[0059] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A method for automatic defrosting and defogging of an automobile, characterized in that: It includes the following steps: S1. Use the windshield temperature sensor to obtain the temperature Tw of the windshield and transmit the data to the MCU in real time; S2. Use the in-vehicle temperature sensor to obtain the temperature Ti inside the vehicle and transmit the data to the MCU in real time; S3. Use the in-vehicle humidity sensor to obtain the relative humidity RH inside the vehicle and transmit the data to the MCU in real time; S4, MCU according to the temperature Ti and relative humidity RH in the car through the formula Calculate the dew point temperature Td in the car; S5. The MCU compares the dew point temperature Td with the windshield temperature Tw and combines with the safety factor x. When Td + x ≥ Tw, it controls the window glass heating module to heat the window glass; when the in-vehicle relative humidity RH is higher than the set value k, it controls the air conditioning system to turn on the external air circulation of the vehicle; S6. During the operation of the window glass heating module and the air conditioning system, the MCU continuously receives the sensor data. When Td + x < Tw, it controls the window glass heating module to stop working; when the in-vehicle relative humidity RH is less than the fixed value k, it controls the air conditioning system to turn off the external circulation.

2. The automatic defrosting and defogging method according to claim 1, characterized in that: When frost is detected, use a heater to heat the window or use a windshield defroster to spray hot air or warm liquid on the window for defrosting; when fogging is detected, use a windshield defogger to spray hot air or warm liquid on the window, or start the air conditioning system to adjust the humidity inside the vehicle for defogging; during the defrosting or defogging process, monitor the corresponding temperature and humidity changes in real time. If the preset termination condition is reached, stop the corresponding processing operation.

3. The automatic defrosting and defogging method according to claim 2, characterized in that: The safety factor x and the set value k can be adjusted through an input device. The input device is a physical button or a function module integrated in the vehicle instrument or the central control display screen. And after receiving the adjustment instruction, the input device will accurately transmit the instruction to the MCU in the form of a digital signal, and the MCU will precisely adjust the safety factor x and the set value k according to this digital signal.

4. The automatic defrosting and defogging method according to claim 1, characterized in that: After the MCU calculates the dew point temperature Td inside the vehicle, it will perform an error check on the calculation result. If the deviation between the calculated dew point temperature Td and the historical calculation result exceeds the preset error range, it will re-collect the data of the in-vehicle temperature Ti and the relative humidity RH and calculate again.

5. An automatic defrosting and defogging system, characterized in that: It includes: A sensor module, including a windshield temperature sensor installed on the windshield, an in-vehicle temperature sensor and an in-vehicle humidity sensor installed at the same position inside the vehicle, which are used to collect the windshield temperature Tw, the in-vehicle temperature Ti and the in-vehicle relative humidity RH; MCU, which is connected to the sensor module and is used to receive data collected by the sensor. Calculate the dew point temperature Td in the vehicle compartment, and control the working status of the window glass heating module and the air conditioning system according to Td, Tw, RH, safety factor x, and set value k; A window glass heating module, which heats the window glass under the control of the MCU; An air conditioning system, which adjusts the humidity inside the vehicle under the control of the MCU; An input device, connected to the MCU, which is used to input signals for adjusting the safety factor x and the set value k to the MCU.

6. The automatic defrosting and defogging system according to claim 5, characterized in that: The installation position of the windshield temperature sensor does not affect the driver's vision. The in-vehicle temperature sensor and the in-vehicle humidity sensor are installed at a position close to the window temperature sensor and do not affect the operation of other wiring harnesses and equipment inside the vehicle. And the sensor module has a self-diagnosis function. If a certain sensor is detected to be faulty, it will immediately send a fault signal to the MCU and display the status information of this sensor on the in-vehicle display screen to remind the user to handle it in time.

7. The automatic defrosting and defogging system according to claim 5, characterized in that: It also includes an on-board control panel or mobile phone APP for controlling the opening and closing of the defrost and defogger functions, and a monitoring module for monitoring the defrost and defogger process and results. The monitoring module will record various parameters during the defrost and defogger process in real time, such as temperature, humidity change curves, etc., and store these data in the system's memory for subsequent analysis and viewing.

8. The automatic defrosting and defogging system according to claim 5, characterized in that: The MCU also has a learning function, and can automatically adjust the default values ​​of the safety factor x and the set value k according to historical data of multiple defrosting and defogger operations.

9. The automatic defrosting and defogging system according to claim 5, characterized in that: The vehicle window glass heating module adopts a zone heating technology, and the MCU can independently control the heating power of each zone according to the temperature conditions of different zones of the windshield.

10. The automatic defrosting and defogging system according to claim 5, characterized in that: When adjusting the humidity in the car, the air-conditioning system will make intelligent adjustments based on the number of people in the car. The system can estimate the number of people through seat pressure sensors or camera recognition technology in the car. When the number of people is large, the dehumidification efficiency of the air-conditioning system will be appropriately increased to ensure that the humidity in the car can be quickly reduced to an appropriate range.

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