Defrosting Method, Device, Storage Medium and Vehicle for Front Windshield in a Vehicle

Abstract

The present application discloses a defrosting method, device, storage medium and vehicle for the front windshield in a vehicle, belonging to the field of autonomous driving technology. Obtain the current state of the new energy vehicle, where the current state is one of the starting state, driving state and parking state; obtain the measurement values corresponding to the current state through the sensor assembly in the new energy vehicle, and the measurement values include at least one parameter measurement value of ambient temperature, humidity, ice thickness in the camera's field of view area, vehicle speed, battery power, etc.; determine the defrosting mode matching the measurement values, and the defrosting mode is one of the prevention mode, emergency mode, high-speed mode, congestion mode, energy-saving mode and maintenance mode; use the heating method corresponding to the matched defrosting mode to heat the camera's field of view area so that the camera's field of view area is not blocked by ice. The present application can ensure that the camera's field of view area is not blocked under different working conditions, reduce the defrosting time, reduce power consumption, and improve the endurance.

Description

Technical Field

[0001] This application relates to the field of autonomous driving technology, and particularly to a defrosting method, device, storage medium and vehicle for the front windshield in a vehicle. Background Art

[0002] In new energy vehicles, a front-view camera is usually integrated with a rain / light sensor and arranged inside the front windshield to implement assisted driving functions (such as lane keeping, pedestrian recognition, obstacle detection, etc.). However, in a low-temperature and high-humidity environment, this area is prone to being blocked by water vapor condensation or ice and snow coverage, directly affecting the environmental perception ability of new energy vehicles, causing the assisted driving function to fail, and seriously threatening driving safety.

[0003] In related technologies, the defrosting function can be turned on to heat the entire front windshield through the vehicle-mounted air conditioner. However, heating the entire front windshield takes a long time to thaw, and the camera function cannot be quickly restored. Moreover, large-scale heating will cause additional power consumption, affecting the endurance of new energy vehicles. Summary of the Invention

[0004] This application provides a defrosting method, device, storage medium and vehicle for the front windshield in a vehicle, which is used to solve the problems that heating the entire front windshield requires a long time for defrosting, the camera function cannot be quickly restored, and the power consumption is large, affecting the endurance of new energy vehicles. The technical solutions are as follows:

[0005] According to the first aspect of this application, a defrosting method for the front windshield in a vehicle is provided. The method includes:

[0006] Obtain the current state of the new energy vehicle, where the current state is one of a startup state, a driving state, and a parking state;

[0007] Obtain a measurement value corresponding to the current state through a sensor assembly in the new energy vehicle, where the measurement value includes at least one parameter measurement value of ambient temperature, humidity, ice thickness in the camera's field of view area, vehicle speed, and battery power;

[0008] Determine a defrosting mode that matches the measured value, where the defrosting mode is one of a prevention mode, an emergency mode, a high-speed mode, a congestion mode, an energy-saving mode, and a maintenance mode. The prevention mode is the defrosting mode when the predicted icing probability is greater than a probability threshold in the startup state. The emergency mode is the defrosting mode when the camera's field of view area is blocked by ice in the startup state or the driving state. The high-speed mode is the defrosting mode with wind resistance assisting defrosting in the high-speed driving state. The congestion mode is the defrosting mode without wind resistance assisting defrosting in the low-speed driving state. The energy-saving mode is the defrosting mode when the battery level is lower than a battery level threshold in the driving state. The maintenance mode is the defrosting mode in the parking state;

[0009] Use a heating method corresponding to the matched defrosting mode to heat the camera's field of view area so that the camera's field of view area is not blocked by ice.

[0010] In a possible implementation, the determining the defrosting mode that matches the measured value includes:

[0011] When the current state is the startup state and the measured value includes the measured values of the ambient temperature, the humidity, and the icing thickness, compare the measured value of the icing thickness with a thickness threshold;

[0012] If the measured value of the icing thickness is less than the thickness threshold, use a trained icing prediction model to process the measured values of the ambient temperature and the humidity to obtain an icing probability; if the icing probability is greater than the probability threshold, determine that the defrosting mode is the prevention mode;

[0013] If the measured value of the icing thickness is greater than or equal to the thickness threshold, determine that the defrosting mode is the emergency mode.

[0014] In a possible implementation, the using a heating method corresponding to the matched defrosting mode to heat the camera's field of view area includes:

[0015] When the defrosting mode is the prevention mode, control the heating of the heating wire located around the camera's field of view area at a first power so that the temperature value of the camera's field of view area is higher than the measured value of the ambient temperature by a first threshold;

[0016] When the defrosting mode is the emergency mode, control the heating of the heating wire located around the camera's field of view area at a second power so that the ice layer in the camera's field of view area melts.

[0017] In a possible implementation, the determining the defrosting mode that matches the measured value includes:

[0018] When the current state is the driving state and the measured values include the measured values of the ice thickness, the vehicle speed, and the battery power, compare the measured value of the ice thickness with a thickness threshold;

[0019] If the measured value of the ice thickness is less than the thickness threshold, determine whether the new energy vehicle is driving at a high speed or a low speed according to the measured value of the vehicle speed; if the new energy vehicle is driving at a high speed and the measured value of the battery power is greater than or equal to the power threshold, determine that the defrosting mode is the high-speed mode; if the new energy vehicle is driving at a high speed and the measured value of the battery power is less than the power threshold, determine that the defrosting mode is the energy-saving mode; if the new energy vehicle is driving at a low speed, determine that the defrosting mode is the congestion mode;

[0020] If the measured value of the ice thickness is greater than or equal to the thickness threshold, determine that the defrosting mode is the emergency mode.

[0021] In a possible implementation, the measured values further include the measured values of the ambient temperature and the humidity, then heating the camera viewing area by using the heating method corresponding to the matched defrosting mode includes:

[0022] When the defrosting mode is the high-speed mode, determine a first target temperature value that is higher than the measured value of the ambient temperature by a second threshold, calculate the dynamic power by using the power formula for the measured values of the ambient temperature, the humidity, the vehicle speed, and the first target temperature value, and control the heating of the heating wire located around the camera viewing area with the dynamic power so that the temperature value of the camera viewing area reaches the first target temperature value, and the power formula is a formula generated based on the phenomenon of wind resistance-assisted defrosting;

[0023] When the defrosting mode is the energy-saving mode, control the heating of the heating wire located around the camera viewing area with a third power, and the third power is less than the dynamic power;

[0024] When the defrosting mode is the congestion mode, control the heating of the heating wire located around the camera viewing area with a fourth power so that the temperature value of the camera viewing area reaches a second target temperature value, and the second target temperature value is a value that is higher than the measured value of the ambient temperature by a third threshold, and the fourth power is greater than the dynamic power;

[0025] When the defrosting mode is the emergency mode, control the heating of the heating wire located around the camera viewing area with a second power so that the ice layer in the camera viewing area melts.

[0026] In a possible implementation, the determining the defrosting mode matching the measured values includes:

[0027] When the current state is a parking state and the measured value includes a measured value of the battery power, compare the measured value of the battery power with the power threshold value;

[0028] If the measured value of the battery power is greater than or equal to the power threshold value, determine that the defrosting mode is a maintenance mode.

[0029] In a possible implementation manner, the measured value further includes a measured value of the ambient temperature. Then, heating the camera viewing area by using a heating method corresponding to the matched defrosting mode includes:

[0030] When the defrosting mode is a maintenance mode, control the heating of the heating wire located around the camera viewing area with a fifth power, so that the temperature value of the camera viewing area is higher than the measured value of the ambient temperature by a fourth threshold value.

[0031] According to a second aspect of the present application, there is provided a defrosting device for a front windshield in a vehicle. The device includes:

[0032] An acquisition module, configured to acquire the current state of a new energy vehicle, where the current state is one of a start state, a driving state, and a parking state;

[0033] The acquisition module is further configured to acquire a measured value corresponding to the current state through a sensor assembly in the new energy vehicle, where the measured value includes at least one parameter measurement value of ambient temperature, humidity, ice thickness of a camera viewing area, vehicle speed, and battery power;

[0034] A determination module, configured to determine a defrosting mode matching the measured value, where the defrosting mode is one of a prevention mode, an emergency mode, a high-speed mode, a congestion mode, an energy-saving mode, and a maintenance mode. The prevention mode is a defrosting mode when the predicted icing probability in the start state is greater than a probability threshold value. The emergency mode is a defrosting mode when the camera viewing area is blocked by ice in the start state or the driving state. The high-speed mode is a defrosting mode with wind resistance assisting defrosting in the high-speed driving state. The congestion mode is a defrosting mode without wind resistance assisting defrosting in the low-speed driving state. The energy-saving mode is a defrosting mode when the power is lower than the power threshold value in the driving state. The maintenance mode is a defrosting mode in the parking state;

[0035] A defrosting module, configured to heat the camera viewing area by using a heating method corresponding to the matched defrosting mode, so that the camera viewing area is not blocked by ice.

[0036] According to a third aspect of the present application, a computer-readable storage medium is provided. At least one instruction is stored in the storage medium, and the at least one instruction is loaded and executed by a processor to implement the method for defrosting the front windshield in a vehicle as described above.

[0037] According to a fourth aspect of the present application, a new energy vehicle is provided. The new energy vehicle includes the defrosting device for the front windshield in the vehicle described above.

[0038] The beneficial effects of the technical solution provided by the present application at least include:

[0039] When the new energy vehicle is in a starting state, a driving state or a parking state, measured values corresponding to each state are obtained, and then a defrosting mode matching the measured values is determined. The heating method corresponding to the defrosting mode is used to heat the camera vision area, so that it can be ensured that the camera vision area is not blocked under different working conditions, the auxiliary driving system can operate normally, negative impacts on driving safety can be avoided, and moreover, only the camera vision area is heated. Compared with heating the entire front windshield, it can not only reduce the heating area and thus reduce the defrosting time, but also reduce power consumption and improve the endurance of the new energy vehicle.

[0040] When the defrosting mode is the high-speed mode, the dynamic power is calculated by using the power formula for the measured values of the environmental temperature, humidity and vehicle speed and the first target temperature value, and the heating wire located around the camera vision area is controlled to generate heat with the dynamic power. The power formula is a formula generated based on the phenomenon of wind resistance-assisted defrosting. In this way, the accelerated evaporation of the melted water can be utilized by the high-speed air flow, thereby reducing the heating energy consumption. Description of the Drawings

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0042] Figure 1 is a flowchart of the method for defrosting the front windshield in a vehicle provided by an embodiment of the present application;

[0043] Figure 2 is a flowchart of the method for defrosting the front windshield in the starting state provided by an embodiment of the present application;

[0044] Figure 3 is a flowchart of the method for defrosting the front windshield in the driving state provided by an embodiment of the present application;

[0045] Figure 4It is a flowchart of a defrosting method for the front windshield in a parked state provided by an embodiment of the present application;

[0046] Figure 5 It is a structural block diagram of a defrosting device for the front windshield in a vehicle provided by an embodiment of the present application. Detailed implementation manners

[0047] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the following will further describe the implementation manners of the present application in detail with reference to the accompanying drawings.

[0048] As Figure 1 shown, it shows a method flowchart of a defrosting method for the front windshield in a vehicle provided by an embodiment of the present application. This defrosting method for the front windshield in the vehicle can be applied to new energy vehicles. The defrosting method for the front windshield in the vehicle may include:

[0049] Step 101, obtain the current state of the new energy vehicle, where the current state is one of the start state, driving state, and parked state.

[0050] In this embodiment, the state of the new energy vehicle can be divided into the start state, driving state, and parked state, and then the corresponding defrosting mode can be selected according to the current state of the new energy vehicle, so as to select the most suitable defrosting mode according to different working conditions.

[0051] Step 102, obtain the measurement value corresponding to the current state through the sensor assembly in the new energy vehicle, where the measurement value includes at least one parameter measurement value of ambient temperature, humidity, ice thickness in the camera's field of view, vehicle speed, and battery power.

[0052] A sensor assembly is installed in the new energy vehicle. The sensor assembly may include an infrared thermal imaging sensor, an environmental sensor, an acceleration sensor, etc. Among them, the infrared thermal imaging sensor is installed near the camera and can scan the camera's field of view to measure the temperature and ice thickness in the camera area. The environmental sensor is installed outside the new energy vehicle and can measure the ambient temperature and humidity. The acceleration sensor can measure the vehicle speed. The battery power can be measured through the circuit in the new energy vehicle.

[0053] Step 103: Determine the defrosting mode that matches the measured value. The defrosting mode is one of the preventive mode, emergency mode, high-speed mode, congestion mode, energy-saving mode, and maintenance mode. The preventive mode is the defrosting mode when the predicted icing probability is greater than the probability threshold in the startup state. The emergency mode is the defrosting mode when the camera's field of view area is blocked by ice in the startup state or driving state. The high-speed mode is the defrosting mode with wind resistance assisting defrosting in the high-speed driving state. The congestion mode is the defrosting mode without wind resistance assisting defrosting in the low-speed driving state. The energy-saving mode is the defrosting mode when the battery level is lower than the battery threshold in the driving state. The maintenance mode is the defrosting mode in the parking state.

[0054] In the startup state, if the camera's field of view area has not yet iced up, but a high probability of icing is predicted, the preventive mode can be entered to keep the temperature of the camera's field of view area higher than the ambient temperature, preventing water vapor from condensing and thus avoiding icing. If the camera's field of view area has already iced up, the emergency mode can be entered to completely melt the ice layer.

[0055] In the driving state, if the camera's field of view area has not yet iced up, the vehicle is driving at high speed and the battery is fully charged, the high-speed mode can be entered to utilize the high-speed airflow to accelerate the evaporation of the melted water and achieve wind resistance-assisted de-icing. This can reduce the heating energy consumption and keep the temperature of the camera's field of view area higher than the ambient temperature. If the camera's field of view area has not yet iced up, the vehicle is driving at high speed and the battery is not fully charged, the energy-saving mode can be entered. Compared with the high-speed mode, the heating power needs to be reduced to give priority to ensuring the normal driving of the vehicle. If the camera's field of view area has not yet iced up and the vehicle is driving at low speed, the congestion mode can be entered. At this time, there is no wind resistance-assisted de-icing, and compared with the high-speed mode, the heating power needs to be increased to keep the temperature of the camera's field of view area higher than the ambient temperature. If the camera's field of view area has already iced up, the emergency mode can be entered to completely melt the ice layer.

[0056] In the parking state, if the new energy vehicle is parked in an open-air parking lot, the temperature continues to drop and the battery is fully charged, the maintenance mode can be entered to keep the temperature of the camera area slightly higher than the ambient temperature and maintain the state of preventing icing.

[0057] Step 104: Heat the camera's field of view area using the heating method corresponding to the matched defrosting mode so that the camera's field of view area is not blocked by the ice layer.

[0058] The camera's field of view area is a small part of the front windshield. A heating film is provided around the camera's field of view area, and the heating film contains resistors. In this way, when a current is passed through the resistors at a certain heating power, the resistors will generate heat, and thus the camera's field of view area can be heated.

[0059] The heating methods corresponding to each defrosting mode are different. The heating methods mentioned here include heating power, trigger conditions for stopping heating, etc.

[0060] For example, when the defrosting mode is the prevention mode, the heating method is to maintain the temperature in the camera's field of view area 3°C higher than the ambient temperature with a heating power of 5 - 15W. When the defrosting mode is the emergency mode, the heating method is to heat the camera's field of view area in a gradient heating manner with a power of 30 - 50W to completely melt the ice layer. The gradient heating method means that the power density in the central area is higher than that in the peripheral area. For example, the power density in the central area is 3W / cm 2 (to achieve the purpose of rapid ice melting), and the power density in the peripheral area is 1.5W / cm 2 (to achieve the purpose of preventing secondary freezing of the melted water). When the defrosting mode is the high-speed mode, the heating method is to adjust the dynamic heating power according to the different wind resistances corresponding to different vehicle speeds, and heat the camera's field of view area through the dynamic power to avoid the impact of overheating on energy consumption. When the defrosting mode is the congestion mode, the heating method is to maintain the temperature in the camera's field of view area 3°C higher than the ambient temperature with a heating power of 5 - 15W. When the defrosting mode is the energy-saving mode, the heating method is to maintain the temperature in the camera's field of view area 2°C higher than the ambient temperature with a heating power of 10 - 20W. When the defrosting mode is the maintenance mode, the heating method is to maintain the temperature in the camera's field of view area 2°C higher than the ambient temperature with a heating power of 5 - 15W.

[0061] In summary, for the defrosting method of the front windshield in a vehicle provided by the embodiments of the present application, when the new energy vehicle is in the starting state, driving state, or parking state, the measured values corresponding to each state are obtained, and then the defrosting mode matching the measured values is determined, and the heating method corresponding to the defrosting mode is used to heat the camera's field of view area. Therefore, it can ensure that the camera's field of view area is not blocked under different working conditions, ensure the normal operation of the assisted driving system, avoid negative impacts on driving safety, and only heat the camera's field of view area. Compared with heating the entire front windshield, it can not only reduce the heating area and thus reduce the defrosting time, but also reduce power consumption and improve the endurance of the new energy vehicle.

[0062] As Figure 2 shown, it shows a flowchart of the defrosting method of the front windshield in a vehicle provided by an embodiment of the present application. The defrosting method of the front windshield in the vehicle can be applied to a new energy vehicle. The defrosting method of the front windshield in the vehicle may include:

[0063] Step 201, obtain the current state of the new energy vehicle, and the current state is one of the starting state, driving state, and parking state.

[0064] Step 202: Obtain measurement values corresponding to the current state through the sensor assembly in the new energy vehicle. The measurement values include at least one parameter measurement value among ambient temperature, humidity, ice thickness in the camera's field of view, vehicle speed, and battery power.

[0065] For the implementation processes of Steps 201 - 202, please refer to the descriptions in Steps 101 - 102, which will not be elaborated here.

[0066] Step 203: When the current state is the start state and the measurement values include the measurement values of ambient temperature, humidity, and ice thickness, compare the measurement value of the ice thickness with the thickness threshold.

[0067] In this embodiment, the thickness threshold can be set to the ice layer thickness that does not block the camera's field of view. For example, set the thickness threshold to 0.5 mm. When the measurement value of the ice layer thickness is less than 0.5 mm, the ice layer is thinner, and the camera can clearly capture the scenery outside the vehicle through the ice layer without blocking the camera's field of view; when the measurement value of the ice layer thickness is greater than or equal to 0.5 mm, the ice layer is too thick and will block the camera's field of view.

[0068] If the measurement value of the ice thickness is less than the thickness threshold, then execute Step 204; if the measurement value of the ice thickness is greater than or equal to the thickness threshold, then execute Step 205.

[0069] Step 204: If the measurement value of the ice thickness is less than the thickness threshold, then process the measurement values of ambient temperature and humidity using the trained ice formation prediction model to obtain the ice formation probability; if the ice formation probability is greater than the probability threshold, then determine that the defrosting mode is the prevention mode and execute Step 206.

[0070] The ice formation prediction model is a model trained using historical data. The input data of this model are the measurement values of ambient temperature and humidity, and the output data is the ice formation probability. Among them, the ice formation prediction model can be a deep learning model, such as a Long Short - Term Memory (LSTM) model, etc.

[0071] After obtaining the ice formation probability, compare the ice formation probability with the probability threshold. If the ice formation probability is greater than the probability threshold, then determine that the defrosting mode is the prevention mode; if the ice formation probability is less than or equal to the probability threshold, then no defrosting is performed. Among them, the probability threshold is a preset value, usually greater than 50%.

[0072] Step 205: If the measurement value of the ice thickness is greater than or equal to the thickness threshold, then determine that the defrosting mode is the emergency mode and execute Step 207.

[0073] Step 206, when the defrosting mode is the prevention mode, control the heating of the heating wire located around the camera's field of view area at a first power, so that the temperature value of the camera's field of view area is higher than the measured value of the ambient temperature by a first threshold.

[0074] Among them, the first power can be any value within a power range. For example, if the power range is 5 - 15W, the first power can be set to 10W. The value of the first threshold can be preset. For example, the first threshold is 3. Correspondingly, when the defrosting mode is the prevention mode, the heating method is to maintain the temperature of the camera's field of view area 3°C higher than the ambient temperature with a heating power of 10W.

[0075] Step 207, when the defrosting mode is the emergency mode, control the heating of the heating wire located around the camera's field of view area at a second power, so that the ice layer within the camera's field of view area melts.

[0076] Among them, the value of the second power can be preset.

[0077] In one example, when the defrosting mode is the emergency mode, the heating method is to heat the camera's field of view area in a gradient heating mode of 30 - 50W to completely melt the ice layer. The gradient heating mode means that the power of the central area is higher than that of the peripheral area. For example, the power density of the central area is 3W / cm 2 (to achieve the purpose of rapid ice melting), and the power density of the peripheral area is 1.5W / cm 2 (to achieve the purpose of preventing secondary freezing of the melted water).

[0078] In summary, the defrosting method for the front windshield in a vehicle provided by the embodiments of the present application obtains the measured values corresponding to each state when the new energy vehicle is in the starting state, driving state, or parking state, then determines the defrosting mode matching the measured value, and uses the heating method corresponding to the defrosting mode to heat the camera's field of view area. Thus, it can ensure that the camera's field of view area is not blocked under different working conditions, ensure the normal operation of the assisted driving system, avoid negative impacts on driving safety, and only heat the camera's field of view area. Compared with heating the entire front windshield, it can not only reduce the heating area and thus reduce the defrosting time, but also reduce power consumption and improve the endurance of the new energy vehicle.

[0079] As Figure 3 shown, it shows a flowchart of the defrosting method for the front windshield in a vehicle provided by an embodiment of the present application. The defrosting method for the front windshield in a vehicle can be applied to a new energy vehicle. The defrosting method for the front windshield in a vehicle can include:

[0080] Step 301, obtain the current state of the new energy vehicle, and the current state is one of the starting state, driving state, and parking state.

[0081] Step 302: Obtain measurement values corresponding to the current state through the sensor assembly in the new energy vehicle. The measurement values include at least one parameter measurement value of ambient temperature, humidity, ice thickness in the camera's field of view area, vehicle speed, and battery power.

[0082] For the implementation processes of Steps 301 - 302, please refer to the descriptions in Steps 101 - 102, which will not be elaborated here.

[0083] Step 303: When the current state is the driving state and the measurement values include the measurement values of ice thickness, vehicle speed, and battery power, compare the measurement value of ice thickness with the thickness threshold.

[0084] In this embodiment, the thickness threshold can be set to the ice thickness that does not block the camera's field of view. For example, set the thickness threshold to 0.5 mm. When the measurement value of ice thickness is less than 0.5 mm, the ice layer is relatively thin, and the camera can clearly capture the scenery outside the vehicle through the ice layer without blocking the camera's field of view; when the measurement value of ice thickness is greater than or equal to 0.5 mm, the ice layer is too thick and will block the camera's field of view.

[0085] If the measurement value of ice thickness is less than the thickness threshold, execute Step 304; if the measurement value of ice thickness is greater than or equal to the thickness threshold, execute Step 308.

[0086] Step 304: If the measurement value of ice thickness is less than the thickness threshold, determine whether the new energy vehicle is driving at a high speed or a low speed according to the measurement value of vehicle speed.

[0087] Specifically, a speed threshold can be preset, and compare the measurement value of vehicle speed with the speed threshold; if the measurement value of vehicle speed is greater than or equal to the speed threshold, determine that the new energy vehicle is driving at a high speed; if the measurement value of vehicle speed is less than the speed threshold, determine that the new energy vehicle is driving at a low speed, and execute Step 307.

[0088] After determining that the new energy vehicle is driving at a high speed, it is also necessary to determine whether the power of the new energy vehicle is sufficient. Specifically, compare the measurement value of battery power with the power threshold; if the measurement value of battery power is greater than or equal to the power threshold, determine that the power is sufficient, and execute Step 305; if the measurement value of battery power is less than the power threshold, determine that the power is insufficient, and execute Step 306.

[0089] Step 305: If the new energy vehicle is driving at a high speed and the measurement value of battery power is greater than or equal to the power threshold, determine that the defrosting mode is the high - speed mode, and execute Step 309.

[0090] Step 306, if the new energy vehicle is driving at a high speed and the measured value of the battery power is less than the power threshold, determine that the defrost mode is the energy-saving mode, and execute Step 310.

[0091] Step 307, if the new energy vehicle is driving at a low speed, determine that the defrost mode is the congestion mode, and execute Step 311.

[0092] Step 308, if the measured value of the ice thickness is greater than or equal to the thickness threshold, determine that the defrost mode is the emergency mode, and execute Step 312.

[0093] Step 309, when the defrost mode is the high-speed mode, determine the first target temperature value that is higher than the measured value of the ambient temperature by a second threshold, and calculate the dynamic power using the power formula for the measured values of the ambient temperature, humidity, vehicle speed, and the first target temperature value, and control the heating of the heating wire around the camera's field of view with the dynamic power so that the temperature value in the camera's field of view reaches the first target temperature value. The power formula is a formula generated based on the phenomenon of defrosting assisted by wind resistance.

[0094] Among them, the value of the second threshold can be set in advance.

[0095] When the defrost mode is the high-speed mode, the heating method is to adjust the dynamic power of heating according to the different wind resistances corresponding to different vehicle speeds, and heat the camera's field of view with the dynamic power.

[0096] The calculation formula for the dynamic power is , where P represents the dynamic power, Kp represents the proportional-integral-derivative (PID) proportional coefficient (such as 0.8, which can be dynamically adjusted), Ttar represents the first target temperature value, Trea represents the measured value of the ambient temperature, α represents the vehicle speed influence factor, which is a constant (such as 0.2, optimized through calibration), V represents the measured value of the vehicle speed, β represents the humidity influence factor, which is a constant (such as 0.05, optimized through calibration), and H represents the relative humidity.

[0097] In this embodiment, the heating wire is installed in the heating film, and the rated power of the heating film has upper and lower limits. For example, the upper limit is 50W and the lower limit is 30W, then the calculated dynamic power needs to be within the range of the upper and lower limits.

[0098] For example, Trea = -10°C, Ttar = 5°C, the relative humidity is 80%, the measured value of the vehicle speed is 60 km / h, and the dynamic power P = 0.8×(5 - (-10)) + 0.2×60×(1 - e -0.05×80 ) = 12 + 12×(1 - e -4) ≈ 12 + 12 × 0.98 ≈ 23.8W, and the upper and lower limits range from 30 - 50W. Therefore, the final output dynamic power is 30W.

[0099] Step 310, when the defrosting mode is the energy-saving mode, control the heating of the heating wire located around the camera's field of view area with a third power, and the third power is less than the dynamic power.

[0100] When the defrosting mode is the energy-saving mode, compared with the high-speed mode, the heating power needs to be reduced, and the normal driving of the vehicle is preferably ensured. That is, the third power is less than the dynamic power.

[0101] In one example, the heating method in the energy-saving mode is to maintain the temperature of the camera's field of view area 2°C higher than the ambient temperature with a heating power of 10 - 20W.

[0102] Step 311, when the defrosting mode is the congestion mode, control the heating of the heating wire located around the camera's field of view area with a fourth power so that the temperature value of the camera's field of view area reaches a second target temperature value, and the second target temperature value is a value that is higher than the measured value of the ambient temperature by a third threshold, and the fourth power is greater than the dynamic power.

[0103] When the defrosting mode is the congestion mode, there is no wind resistance to assist in deicing at this time. Compared with the high-speed mode, the heating power needs to be increased to keep the temperature of the camera's field of view area higher than the ambient temperature. That is, the fourth power is greater than the dynamic power.

[0104] In one example, the heating method in the energy-saving mode is to maintain the temperature of the camera's field of view area 3°C higher than the ambient temperature with a heating power of 5 - 15W.

[0105] Step 312, when the defrosting mode is the emergency mode, control the heating of the heating wire located around the camera's field of view area with a second power to melt the ice layer within the camera's field of view area.

[0106] Among them, the value of the second power can be preset.

[0107] In one example, when the defrosting mode is the emergency mode, the heating method is to heat the camera's field of view area in a gradient heating method of 30 - 50W to completely melt the ice layer. The gradient heating method means that the power in the central area is higher than the power in the peripheral area. For example, the power density in the central area is 3W / cm 2 (to achieve the purpose of rapid ice melting), and the power density in the peripheral area is 1.5W / cm 2 (to achieve the purpose of preventing secondary freezing of the melted water).

[0108] In summary, for the defrosting method of the front windshield in a vehicle provided by the embodiments of the present application, when the new energy vehicle is in a startup state, a driving state, or a parking state, measurement values corresponding to each state are obtained, and then a defrosting mode matching the measurement values is determined. The heating method corresponding to the defrosting mode is used to heat the camera's field of view area, so that it can ensure that the camera's field of view area is not blocked under different working conditions, ensure the normal operation of the assisted driving system, avoid negative impacts on driving safety, and moreover, only heat the camera's field of view area. Compared with heating the entire front windshield, it can not only reduce the heating area and thus reduce the defrosting time, but also reduce power consumption and improve the endurance of the new energy vehicle.

[0109] When the defrosting mode is the high-speed mode, the dynamic power is calculated using the power formula based on the measured values of the environmental temperature, humidity, vehicle speed, and the first target temperature value, and the heating wire located around the camera's field of view area is controlled to generate heat with this dynamic power. The power formula is a formula generated based on the phenomenon of wind resistance-assisted defrosting. In this way, the high-speed air flow can be used to accelerate the evaporation of the melted water, thereby reducing the heating energy consumption.

[0110] As Figure 4 shown, it shows a flowchart of the defrosting method of the front windshield in a vehicle provided by an embodiment of the present application. The defrosting method of the front windshield in this vehicle can be applied to new energy vehicles. The defrosting method of the front windshield in this vehicle may include:

[0111] Step 401, obtain the current state of the new energy vehicle, where the current state is one of the startup state, the driving state, and the parking state.

[0112] Step 402, obtain the measurement values corresponding to the current state through the sensor assembly in the new energy vehicle. The measurement values include at least one parameter measurement value of the environmental temperature, humidity, ice thickness of the camera's field of view area, vehicle speed, and battery power.

[0113] For the implementation processes of steps 401-402, please refer to the descriptions in steps 101-102 and will not be elaborated here.

[0114] Step 403, when the current state is the parking state and the measurement values include the measurement value of the battery power, compare the measurement value of the battery power with the power threshold.

[0115] Compare the measurement value of the battery power with the power threshold; if the measurement value of the battery power is greater than or equal to the power threshold, it is determined that the power is sufficient, and step 404 is executed; if the measurement value of the battery power is less than the power threshold, it is determined that the power is insufficient and defrosting is not performed.

[0116] Step 404, if the measurement value of the battery power is greater than or equal to the power threshold, it is determined that the defrosting mode is the maintenance mode.

[0117] Step 405: When the defrosting mode is the maintenance mode, control the heating of the heating wire located around the camera's field of view area with the fifth power, so that the temperature value of the camera's field of view area is higher than the measured value of the ambient temperature by the fourth threshold.

[0118] When the defrosting mode is the maintenance mode, keep the temperature of the camera area slightly higher than the ambient temperature to maintain a state of preventing icing.

[0119] In one example, the heating method in the maintenance mode is to maintain the temperature of the camera's field of view area 2°C higher than the ambient temperature with a heating power of 5 - 15W.

[0120] In summary, the defrosting method for the front windshield in a vehicle provided by the embodiments of the present application obtains the measured values corresponding to each state when the new energy vehicle is in the starting state, driving state, or parking state, then determines the defrosting mode matching the measured value, and uses the heating method corresponding to the defrosting mode to heat the camera's field of view area. Thus, it can ensure that the camera's field of view area is not blocked under different working conditions, ensure the normal operation of the assisted driving system, avoid negative impacts on driving safety, and moreover, only heat the camera's field of view area. Compared with heating the entire front windshield, it can not only reduce the heating area and thus reduce the defrosting time, but also reduce power consumption and improve the battery life of the new energy vehicle.

[0121] As Figure 5 shown, it shows a structural block diagram of a defrosting device for the front windshield in a vehicle provided by an embodiment of the present application. The defrosting device for the front windshield in the vehicle can be applied to a new energy vehicle. The defrosting device for the front windshield in the vehicle may include:

[0122] An acquisition module 510, configured to acquire the current state of the new energy vehicle, where the current state is one of a starting state, a driving state, and a parking state;

[0123] The acquisition module 510 is further configured to acquire the measured values corresponding to the current state through a sensor assembly in the new energy vehicle, and the measured values include at least one parameter measurement value of ambient temperature, humidity, icing thickness of the camera's field of view area, vehicle speed, battery power, etc.

[0124] A determination module 520 is configured to determine a defrosting mode that matches the measured values. The defrosting mode is one of a prevention mode, an emergency mode, a high-speed mode, a congestion mode, an energy-saving mode, and a maintenance mode. The prevention mode is the defrosting mode when the predicted icing probability in the startup state is greater than a probability threshold. The emergency mode is the defrosting mode when the camera's field of view area is blocked by ice in the startup state or the driving state. The high-speed mode is the defrosting mode with wind resistance-assisted defrosting in the high-speed driving state. The congestion mode is the defrosting mode without wind resistance-assisted defrosting in the low-speed driving state. The energy-saving mode is the defrosting mode when the battery power is lower than a power threshold in the driving state. The maintenance mode is the defrosting mode in the parking state;

[0125] A defrosting module 530 is configured to heat the camera's field of view area by using a heating method corresponding to the matched defrosting mode, so that the camera's field of view area is not blocked by ice.

[0126] In an optional embodiment, the determination module 520 is further configured to:

[0127] When the current state is the startup state and the measured values include the measured values of the ambient temperature, humidity, and icing thickness, compare the measured value of the icing thickness with a thickness threshold;

[0128] If the measured value of the icing thickness is less than the thickness threshold, process the measured values of the ambient temperature and humidity by using a trained icing prediction model to obtain an icing probability; if the icing probability is greater than the probability threshold, determine that the defrosting mode is the prevention mode;

[0129] If the measured value of the icing thickness is greater than or equal to the thickness threshold, determine that the defrosting mode is the emergency mode.

[0130] In an optional embodiment, the defrosting module 530 is further configured to:

[0131] When the defrosting mode is the prevention mode, control the heating of the heating wire located around the camera's field of view area with a first power, so that the temperature value of the camera's field of view area is higher than the measured value of the ambient temperature by a first threshold;

[0132] When the defrosting mode is the emergency mode, control the heating of the heating wire located around the camera's field of view area with a second power, so that the ice layer in the camera's field of view area melts.

[0133] In an optional embodiment, the determination module 520 is further configured to:

[0134] When the current state is the driving state and the measured values include the measured values of the icing thickness, vehicle speed, and battery power, compare the measured value of the icing thickness with a thickness threshold;

[0135] If the measured value of the ice thickness is less than the thickness threshold, determine whether the new energy vehicle is driving at a high speed or a low speed according to the measured value of the vehicle speed; if the new energy vehicle is driving at a high speed and the measured value of the battery power is greater than or equal to the power threshold, determine that the defrosting mode is the high-speed mode; if the new energy vehicle is driving at a high speed and the measured value of the battery power is less than the power threshold, determine that the defrosting mode is the energy-saving mode; if the new energy vehicle is driving at a low speed, determine that the defrosting mode is the congestion mode;

[0136] If the measured value of the ice thickness is greater than or equal to the thickness threshold, determine that the defrosting mode is the emergency mode.

[0137] In an optional embodiment, the defrosting module 530 is further configured to:

[0138] When the defrosting mode is the high-speed mode, determine a first target temperature value that is higher than the measured value of the ambient temperature by a second threshold, calculate the dynamic power using the power formula based on the measured values of the ambient temperature, humidity, vehicle speed, and the first target temperature value, and control the heating of the heating wire around the camera's field of view area with the dynamic power so that the temperature value of the camera's field of view area reaches the first target temperature value. The power formula is a formula generated based on the phenomenon of wind resistance-assisted defrosting;

[0139] When the defrosting mode is the energy-saving mode, control the heating of the heating wire around the camera's field of view area with a third power, and the third power is less than the dynamic power;

[0140] When the defrosting mode is the congestion mode, control the heating of the heating wire around the camera's field of view area with a fourth power so that the temperature value of the camera's field of view area reaches a second target temperature value. The second target temperature value is a value that is higher than the measured value of the ambient temperature by a third threshold, and the fourth power is greater than the dynamic power;

[0141] When the defrosting mode is the emergency mode, control the heating of the heating wire around the camera's field of view area with a second power so that the ice layer within the camera's field of view area melts.

[0142] In an optional embodiment, the determination module 520 is further configured to:

[0143] When the current state is the parking state and the measured value includes the measured value of the battery power, compare the measured value of the battery power with the power threshold;

[0144] If the measured value of the battery power is greater than or equal to the power threshold, determine that the defrosting mode is the maintenance mode.

[0145] In an optional embodiment, the defrosting module 530 is further configured to:

[0146] When the defrost mode is the maintenance mode, the heating wire located around the camera's field of view area is controlled to generate heat at the fifth power, so that the temperature value of the camera's field of view area is higher than the measured value of the ambient temperature by the fourth threshold value.

[0147] In summary, the front windshield defrosting device provided in the embodiment of the present application for a vehicle obtains the measured value corresponding to each state when the new energy vehicle is in the starting state, driving state or parking state, then determines the defrost mode matching the measured value, and uses the heating method corresponding to the defrost mode to heat the camera's field of view area. Therefore, it can ensure that the camera's field of view area is not blocked under different working conditions, ensure the normal operation of the assisted driving system, avoid negative impacts on driving safety, and moreover, only heat the camera's field of view area. Compared with heating the entire front windshield, it can not only reduce the heating area and thus reduce the defrosting time, but also reduce power consumption and improve the endurance of the new energy vehicle.

[0148] When the defrost mode is the high-speed mode, the dynamic power is calculated by using the power formula for the measured values of the ambient temperature, humidity, vehicle speed and the first target temperature value, and the heating wire located around the camera's field of view area is controlled to generate heat at the dynamic power. The power formula is a formula generated based on the phenomenon of wind resistance assisting defrosting. In this way, it can utilize the high-speed air flow to accelerate the evaporation of the melted water, thereby reducing the heating energy consumption.

[0149] An embodiment of the present application provides a computer-readable storage medium, in which at least one instruction is stored, and the at least one instruction is loaded and executed by a processor to implement the above-mentioned front windshield defrosting method for a vehicle.

[0150] An embodiment of the present application provides a new energy vehicle, and the new energy vehicle includes the front windshield defrosting device for any vehicle as described above.

[0151] It should be noted that: when the front windshield defrosting device for a vehicle provided in the above embodiment performs defrosting of the front windshield of the vehicle, only the above-mentioned division of each functional module is used for illustration. In practical applications, the above functions can be allocated to different functional modules according to needs, that is, the internal structure of the front windshield defrosting device for a vehicle is divided into different functional modules to complete all or part of the functions described above. In addition, the front windshield defrosting device for a vehicle provided in the above embodiment and the embodiment of the front windshield defrosting method for a vehicle belong to the same concept, and the specific implementation process can be seen in the method embodiment, which will not be elaborated here.

[0152] Those of ordinary skill in the art can understand that all or part of the steps to implement the above embodiments can be completed by hardware or by a program instructing relevant hardware. The program can be stored in a computer-readable storage medium, and the above-mentioned storage medium can be a read-only memory, a disk, an optical disc, etc.

[0153] The above description is not intended to limit the embodiments of the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the embodiments of the present application shall be included in the protection scope of the embodiments of the present application.

Claims

1. A defrosting method for the front windshield in a vehicle, characterized in that, The method includes: Obtaining the current state of the new energy vehicle, where the current state is one of a starting state, a driving state, and a parking state; Obtaining a measurement value corresponding to the current state through a sensor assembly in the new energy vehicle, where the measurement value includes at least one parameter measurement value of ambient temperature, humidity, ice thickness in the camera's field of view, vehicle speed, and battery power; Determining a defrosting mode that matches the measurement value, where the defrosting mode is one of a prevention mode, an emergency mode, a high-speed mode, a congestion mode, an energy-saving mode, and a maintenance mode. The prevention mode is the defrosting mode when the predicted ice formation probability in the starting state is greater than a probability threshold. The emergency mode is the defrosting mode when the camera's field of view is blocked by ice in the starting state or the driving state. The high-speed mode is the defrosting mode with wind resistance assisting defrosting in the high-speed driving state. The congestion mode is the defrosting mode without wind resistance assisting defrosting in the low-speed driving state. The energy-saving mode is the defrosting mode when the power is lower than a power threshold in the driving state. The maintenance mode is the defrosting mode in the parking state; Heating the camera's field of view using a heating method corresponding to the matched defrosting mode so that the camera's field of view is not blocked by ice; When the current state is the driving state and the measurement value includes the measurement values of the ambient temperature, the humidity, and the vehicle speed, heating the camera's field of view using a heating method corresponding to the matched defrosting mode includes: When the defrosting mode is the high-speed mode, determine a first target temperature value that is higher than the measured value of the ambient temperature by a second threshold. Use the power formula to calculate the dynamic power based on the measured values of the ambient temperature, the humidity, the vehicle speed, and the first target temperature value. Control the heating of the heating wire located around the camera's field of view with the dynamic power so that the temperature value of the camera's field of view reaches the first target temperature value. The power formula is a formula generated based on the phenomenon of wind resistance-assisted defrosting, and the power formula is , where P represents the dynamic power, Kp represents the proportional-integral-derivative PID proportionality coefficient, Ttar represents the first target temperature value, Trea represents the measured value of the ambient temperature, α represents the vehicle speed influence factor, V represents the measured value of the vehicle speed, β represents the humidity influence factor, and H represents the relative humidity; When the defrosting mode is the congestion mode, controlling the heating of the heating wire located around the camera's field of view with a fourth power so that the temperature value of the camera's field of view reaches a second target temperature value, where the second target temperature value is a value higher than the measurement value of the ambient temperature by a third threshold, and the fourth power is greater than the dynamic power.

2. The defrosting method of the front windshield in a vehicle according to claim 1, characterized in that, The determining the defrosting mode that matches the measurement value includes: When the current state is the starting state and the measurement value includes the measurement values of the ambient temperature, the humidity, and the ice thickness, comparing the measurement value of the ice thickness with a thickness threshold; If the measurement value of the ice thickness is less than the thickness threshold, processing the measurement values of the ambient temperature and the humidity using a trained ice formation prediction model to obtain an ice formation probability; if the ice formation probability is greater than the probability threshold, determining that the defrosting mode is the prevention mode; If the measurement value of the ice thickness is greater than or equal to the thickness threshold, determining that the defrosting mode is the emergency mode.

3. The defrosting method for the front windshield in a vehicle according to claim 2, wherein Heating the camera's field of view using a heating method corresponding to the matched defrosting mode includes: When the defrosting mode is the prevention mode, controlling the heating of the heating wire located around the camera's field of view with a first power so that the temperature value of the camera's field of view is higher than the measurement value of the ambient temperature by a first threshold; When the defrosting mode is the emergency mode, controlling the heating of the heating wire located around the camera's field of view with a second power so that the ice layer in the camera's field of view melts.

4. The defrosting method for the front windshield in a vehicle according to claim 1, characterized in that, Determining a defrosting mode that matches the measurement value includes: When the current state is a driving state and the measurement value further includes measurement values of the ice thickness and the battery power, comparing the measurement value of the ice thickness with a thickness threshold; If the measurement value of the ice thickness is less than the thickness threshold, determining whether the new energy vehicle is driving at a high speed or a low speed according to the measurement value of the vehicle speed; if the new energy vehicle is driving at a high speed and the measurement value of the battery power is greater than or equal to the power threshold, determining that the defrosting mode is a high-speed mode; if the new energy vehicle is driving at a high speed and the measurement value of the battery power is less than the power threshold, determining that the defrosting mode is an energy-saving mode; if the new energy vehicle is driving at a low speed, determining that the defrosting mode is a congestion mode; If the measurement value of the ice thickness is greater than or equal to the thickness threshold, determining that the defrosting mode is an emergency mode.

5. The defrosting method for the front windshield in a vehicle according to claim 4, characterized in that, Adopting a heating method corresponding to the matched defrosting mode to heat the camera vision area includes: When the defrosting mode is an energy-saving mode, controlling the heating of the resistance wire located around the camera vision area with a third power, and the third power is less than the dynamic power; When the defrosting mode is an emergency mode, controlling the heating of the resistance wire located around the camera vision area with a second power to melt the ice layer in the camera vision area.

6. The defrosting method for the front windshield in a vehicle according to claim 1, characterized in that, Determining a defrosting mode that matches the measurement value includes: When the current state is a parking state and the measurement value includes the measurement value of the battery power, comparing the measurement value of the battery power with the power threshold; If the measurement value of the battery power is greater than or equal to the power threshold, determining that the defrosting mode is a maintenance mode.

7. The defrosting method of the front windshield in a vehicle according to claim 6, characterized in that, If the measurement value further includes the measurement value of the ambient temperature, then adopting a heating method corresponding to the matched defrosting mode to heat the camera vision area includes: When the defrosting mode is a maintenance mode, controlling the heating of the resistance wire located around the camera vision area with a fifth power so that the temperature value of the camera vision area is higher than the measurement value of the ambient temperature by a fourth threshold.

8. A defrosting device for a front windshield in a vehicle, characterized in that, The device includes: An acquisition module for acquiring the current state of the new energy vehicle, where the current state is one of a starting state, a driving state, and a parking state; The acquisition module is further configured to acquire, through a sensor assembly in the new energy vehicle, a measurement value corresponding to the current state, and the measurement value includes at least one parameter measurement value of ambient temperature, humidity, ice thickness of the camera vision area, vehicle speed, and battery power; A determination module, configured to determine a defrosting mode that matches the measured value, where the defrosting mode is one of a prevention mode, an emergency mode, a high-speed mode, a congestion mode, an energy-saving mode, and a maintenance mode. The prevention mode is a defrosting mode when the predicted icing probability is greater than a probability threshold in the startup state. The emergency mode is a defrosting mode when the camera's field of view area is blocked by ice in the startup state or the driving state. The high-speed mode is a defrosting mode with wind resistance-assisted defrosting in the high-speed driving state. The congestion mode is a defrosting mode without wind resistance-assisted defrosting in the low-speed driving state. The energy-saving mode is a defrosting mode when the battery power is lower than a power threshold in the driving state. The maintenance mode is a defrosting mode in the parking state; A defrosting module, configured to heat the camera's field of view area by using a heating method corresponding to the matched defrosting mode, so that the camera's field of view area is not blocked by ice; When the current state is the driving state and the measured value includes the measured values of the ambient temperature, the humidity, and the vehicle speed, the defrosting module is further configured to: When the defrosting mode is the high-speed mode, determine a first target temperature value that is higher than the measured value of the ambient temperature by a second threshold, calculate the dynamic power using the power formula for the measured values of the ambient temperature, the humidity, the vehicle speed, and the first target temperature value, and control the heating of the heating wire located around the camera's field of view with the dynamic power so that the temperature value of the camera's field of view reaches the first target temperature value. The power formula is a formula generated based on the phenomenon of wind resistance-assisted defrosting, and the power formula is , where P represents the dynamic power, Kp represents the proportional-integral-derivative PID proportionality coefficient, Ttar represents the first target temperature value, Trea represents the measured value of the ambient temperature, α represents the vehicle speed influence factor, V represents the measured value of the vehicle speed, β represents the humidity influence factor, and H represents the relative humidity; When the defrosting mode is the congestion mode, control the heating of the heating wire located around the camera's field of view area with a fourth power, so that the temperature value of the camera's field of view area reaches a second target temperature value, where the second target temperature value is a value higher than the measured value of the ambient temperature by a third threshold, and the fourth power is greater than the dynamic power.

9. A computer-readable storage medium, characterized in that, At least one instruction is stored in the storage medium, and the at least one instruction is loaded and executed by a processor to implement the defrosting method for the front windshield in the vehicle according to any one of claims 1 to 7.

10. A new energy vehicle, characterized in that, The new energy vehicle includes the defrosting device for the front windshield in the vehicle according to claim 8.

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