Defrosting method and device for front windshield in vehicle, storage medium and vehicle

Abstract

The invention discloses a defrosting method and device for a front windshield in a vehicle, a storage medium and the vehicle, and belongs to the technical field of automatic driving. Obtaining the current state of the new energy vehicle, wherein 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, wherein the measurement value comprises a measurement value of at least one parameter of environment temperature, humidity, icing thickness of a camera view area, vehicle speed and electric quantity of a storage battery; determining a defrosting mode matched with the measured value, wherein 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; and a heating mode corresponding to the matched defrosting mode is adopted to heat the view field area of the camera, so that the view field area of the camera is not shielded by the ice layer. It can be guaranteed that the visual field area of the camera is not shielded under different working conditions, the defrosting time is shortened, electric energy consumption is reduced, and the endurance is improved.

Description

Technical Field

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

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

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

[0004] The present application provides a defrosting method, device, storage medium and vehicle for the front windshield in a vehicle, which is used to solve the problem that the entire front windshield is heated, it takes a long time to defrost, the camera function cannot be quickly restored, and the power consumption is large, which affects the endurance of new energy vehicles. The technical solution is as follows: According to a first aspect of the present application, a method for defrosting a front windshield in a vehicle is provided, the method comprising: 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; Acquiring a measurement value corresponding to the current state through a sensor component in the new energy vehicle, the measurement value comprising a measurement value of at least one parameter of ambient temperature, humidity, ice thickness in a camera field of view, vehicle speed, and battery power; Determine a defrost mode that matches the measured value, the defrost mode being one of a preventive mode, an emergency mode, a high-speed mode, a congestion mode, an energy-saving mode, and a maintenance mode, the preventive mode being a defrost mode when the predicted probability of icing in a startup state is greater than a probability threshold, the emergency mode being a defrost mode when the camera field of view is blocked by ice in a startup state or a driving state, the high-speed mode being a defrost mode with wind resistance assisting defrost in a high-speed driving state, the congestion mode being a defrost mode with no wind resistance assisting defrost in a low-speed driving state, the energy-saving mode being a defrost mode when the battery level is lower than a battery level threshold in a driving state, and the maintenance mode being a defrost mode in a parking state; The camera field of view area is heated by adopting a heating method corresponding to the matched defrost mode so that the camera field of view area is not blocked by the ice layer.

[0005] In a possible implementation, determining a defrost mode that matches the measured value includes: When the current state is a startup state and the measured values ​​include the measured values ​​of the ambient temperature, the humidity and the ice thickness, comparing the measured value of the ice thickness with a thickness threshold; If the measured value of the ice thickness is less than the thickness threshold, the measured values ​​of the ambient temperature and the humidity are processed using a trained ice prediction model to obtain an ice probability; if the ice probability is greater than the probability threshold, it is determined that the defrost mode is a prevention mode; If the measured value of the ice thickness is greater than or equal to the thickness threshold, it is determined that the defrost mode is an emergency mode.

[0006] In a possible implementation, heating the camera field of view area by using a heating method corresponding to the matched defrost mode includes: When the defrost mode is a prevention mode, controlling the resistance wire located around the camera field of view to heat with a first power, so that the temperature value of the camera field of view is higher than the measured value of the ambient temperature by a first threshold value; When the defrost mode is an emergency mode, the resistance wire located around the camera field of view is controlled to heat with a second power to melt the ice layer in the camera field of view.

[0007] In a possible implementation, determining a defrost mode that matches the measured value includes: When the current state is a driving state and the measured values ​​include the measured values ​​of the ice thickness, the vehicle speed and the battery power, comparing the measured value of the ice thickness with a thickness threshold; If the measured value of the ice thickness is less than the thickness threshold, it is determined whether the new energy vehicle is traveling at a high speed or a low speed according to the measured value of the vehicle speed; if the new energy vehicle is traveling at a high speed and the measured value of the battery power is greater than or equal to the power threshold, it is determined that the defrost mode is a high speed mode; if the new energy vehicle is traveling at a high speed and the measured value of the battery power is less than the power threshold, it is determined that the defrost mode is an energy-saving mode; if the new energy vehicle is traveling at a low speed, it is determined that the defrost mode is a congestion mode; If the measured value of the ice thickness is greater than or equal to the thickness threshold, it is determined that the defrost mode is an emergency mode.

[0008] In a possible implementation, the measured values ​​further include measured values ​​of the ambient temperature and the humidity, and the heating method corresponding to the matched defrost mode is used to heat the camera field of view area, including: When the defrost mode is a high-speed mode, determining a first target temperature value that is higher than the measured value of the ambient temperature by a second threshold, calculating dynamic power using a power formula for the measured values ​​of the ambient temperature, the humidity, and the vehicle speed, and the first target temperature value, and controlling the heating of a resistance wire located around the camera field of view area with the dynamic power so that the temperature value of the camera field of view area reaches the first target temperature value, the power formula being a formula generated based on the phenomenon of wind resistance assisting defrosting; When the defrost mode is an energy-saving mode, the resistance wire located around the camera field of view is controlled to heat with a third power, and the third power is less than the dynamic power; When the defrost mode is a congestion mode, the resistance wire located around the camera field of view is controlled to heat with a fourth power so that the temperature value of the camera field of view reaches a second target temperature value, 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; When the defrost mode is an emergency mode, the resistance wire located around the camera field of view is controlled to heat with a second power to melt the ice layer in the camera field of view.

[0009] In a possible implementation, determining a defrost mode that matches the measured value includes: When the current state is a parking state and the measured value includes the measured value of the battery power, comparing the measured value of the battery power with the power threshold; If the measured value of the battery power is greater than or equal to the power threshold, it is determined that the defrost mode is a maintenance mode.

[0010] In a possible implementation, the measured value further includes the measured value of the ambient temperature, and the heating method corresponding to the matched defrost mode is used to heat the camera field of view area, including: When the defrost mode is a maintenance mode, the resistance wire located around the camera field of view is controlled to heat with a fifth power so that the temperature value of the camera field of view is higher than the measured value of the ambient temperature by a fourth threshold.

[0011] According to a second aspect of the present application, a defrosting device for a front windshield in a vehicle is provided, the device comprising: An acquisition module, used to acquire the current state of the new energy vehicle, wherein the current state is one of a starting state, a driving state and a parking state; The acquisition module is further used to acquire a measurement value corresponding to the current state through a sensor component in the new energy vehicle, wherein the measurement value includes a measurement value of at least one parameter of ambient temperature, humidity, ice thickness in a camera field of view, vehicle speed, and battery power; a determination module, for determining a defrost mode matching the measured value, the defrost mode being 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 defrost mode when the predicted probability of icing in a startup state is greater than a probability threshold; the emergency mode is a defrost mode when the camera field of view is blocked by ice in a startup state or a driving state; the high-speed mode is a defrost mode with wind resistance assisting defrost in a high-speed driving state; the congestion mode is a defrost mode with no wind resistance assisting defrost in a low-speed driving state; the energy-saving mode is a defrost mode when the battery level is lower than a battery level threshold in a driving state; and the maintenance mode is a defrost mode in a parking state; The defrost module is used to heat the camera field of view area by adopting a heating method corresponding to the matched defrost mode so that the camera field of view area is not blocked by the ice layer.

[0012] According to a third aspect of the present application, a computer-readable storage medium is provided, in which at least one instruction is stored. 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.

[0013] According to a fourth aspect of the present application, a new energy vehicle is provided, comprising a defrosting device for the front windshield in the above-mentioned vehicle.

[0014] The beneficial effects of the technical solution provided by this application include at least: When the new energy vehicle is in the starting state, driving state or parking state, the measurement value corresponding to each state is obtained, and then the defrost mode matching the measurement value is determined, and the camera field of view area is heated by the heating method corresponding to the defrost mode, so as to ensure that the camera field of view area is not blocked under different working conditions, ensure the normal operation of the auxiliary driving system, and avoid negative impact on driving safety. Moreover, compared with heating the entire windshield, heating only the camera field of view area can not only reduce the heating area and thus reduce the defrost time, but also reduce power consumption and improve the endurance of new energy vehicles.

[0015] When the defrost mode is the high-speed mode, the power formula is used to calculate the dynamic power based on the measured values ​​of the ambient temperature, humidity and vehicle speed and the first target temperature value. The dynamic power is used to control the heating of the resistance wire located around the camera field of view. The power formula is generated based on the phenomenon of wind resistance assisted defrosting. In this way, high-speed airflow can be used to accelerate the evaporation of melt water, thereby reducing heating energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 is a flow chart of a method for defrosting a front windshield in a vehicle provided by an embodiment of the present application; Figure 2 is a flow chart of a method for defrosting a front windshield in a startup state provided by an embodiment of the present application; Figure 3 This is a flow chart of a method for defrosting a front windshield in a driving state provided by an embodiment of the present application; Figure 4 This is a flow chart of a method for defrosting a front windshield in a parking state provided by an embodiment of the present application; Figure 5 This is a structural block diagram of a defrosting device for a front windshield in a vehicle provided by an embodiment of the present application. DETAILED DESCRIPTION

[0018] In order to make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the implementation methods of the present application will be further described in detail below in conjunction with the accompanying drawings.

[0019] like Figure 1 As shown, it shows a method flow chart of a defrosting method for a front windshield in a vehicle provided by an embodiment of the present application, and the defrosting method for a front windshield in a vehicle can be applied to new energy vehicles. The defrosting method for a front windshield in a vehicle may include: Step 101, 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.

[0020] In this embodiment, the state of the new energy vehicle can be divided into starting state, driving state and parking state, and then the corresponding defrost mode is selected according to the current state of the new energy vehicle, so as to select the most suitable defrost mode according to different working conditions.

[0021] Step 102, obtaining a measurement value corresponding to the current state through a sensor component in the new energy vehicle, wherein the measurement value includes a measurement value of at least one parameter of ambient temperature, humidity, ice thickness in a camera field of view, vehicle speed, and battery power.

[0022] A sensor assembly is installed in a new energy vehicle, which 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 of the camera area. The environmental sensor is installed on the outside of the new energy vehicle and can measure the ambient temperature and humidity. The acceleration sensor can measure the vehicle speed. The battery charge can be measured by the circuit in the new energy vehicle.

[0023] Step 103, determine the defrost mode that matches the measured value, the defrost mode is one of the prevention mode, emergency mode, high-speed mode, congestion mode, energy-saving mode and maintenance mode. The prevention mode is a defrost mode when the predicted probability of icing in the starting state is greater than the probability threshold. The emergency mode is a defrost mode when the camera field of view is blocked by ice in the starting state or driving state. The high-speed mode is a defrost mode with wind resistance assisting defrost in the high-speed driving state. The congestion mode is a defrost mode without wind resistance assisting defrost in the low-speed driving state. The energy-saving mode is a defrost mode when the battery level is lower than the battery level threshold in the driving state. The maintenance mode is a defrost mode in the parking state.

[0024] In the activated state, if the camera field of view has not yet frozen, but a high probability of freezing is predicted, the system can enter the prevention mode to keep the temperature of the camera field of view higher than the ambient temperature to prevent condensation and thus avoid freezing. If the camera field of view has already frozen, the system can enter the emergency mode to completely melt the ice.

[0025] When driving, if the camera field of view has not yet frozen, the vehicle is traveling at high speed and has sufficient power, the high-speed mode can be entered to use high-speed airflow to accelerate the evaporation of melted water and achieve wind resistance-assisted deicing, which can reduce heating energy consumption and keep the temperature of the camera field of view higher than the ambient temperature; if the camera field of view has not yet frozen, the vehicle is traveling at high speed and has insufficient power, the energy-saving mode can be entered, which requires lower heating power than the high-speed mode to give priority to ensuring normal driving of the vehicle; if the camera field of view has not yet frozen and the vehicle is traveling at a low speed, the congestion mode can be entered, at which time there is no wind resistance-assisted deicing, and the heating power needs to be increased compared to the high-speed mode to keep the temperature of the camera field of view higher than the ambient temperature. If the camera field of view has already frozen, the emergency mode can be entered to completely melt the ice.

[0026] When parked, if the new energy vehicle is parked in an open-air parking lot, the temperature continues to drop and the battery is sufficient, it can enter the maintenance mode to keep the temperature of the camera area slightly higher than the ambient temperature to maintain the state of preventing icing.

[0027] Step 104, heating the camera field of view area by using a heating method corresponding to the matched defrost mode, so that the camera field of view area is not blocked by the ice layer.

[0028] The camera field of view area is a small area in the front windshield. A heating film is provided around the camera field of view area, and the heating film contains a resistor. In this way, when the current is controlled to flow through the resistor with a certain heating power, the resistor will generate heat, thereby heating the camera field of view area.

[0029] Each defrost mode corresponds to a different heating method. The heating method here includes heating power, triggering conditions for stopping heating, etc.

[0030] For example, when the defrost mode is the preventive mode, the heating method is to maintain the temperature of the camera field of view 3°C higher than the ambient temperature with a heating power of 5-15W. When the defrost mode is the emergency mode, the heating method is to heat the camera field of view with a gradient heating method of 30-50W to completely melt the ice layer. The gradient heating method means that the power in the center area is higher than the power in the peripheral area, such as the power density in the center area is 3W / cm 2 (To achieve the purpose of rapid ice melting), the power density in the outer area is 1.5W / cm 2 (To prevent the secondary freezing of melted water). When the defrost mode is 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 field of view area through dynamic power to avoid the impact of excessive heating on energy consumption. When the defrost mode is congestion mode, the heating method is to maintain the temperature of the camera field of view area 3°C higher than the ambient temperature with a heating power of 5-15W. When the defrost mode is energy-saving mode, the heating method is to maintain the temperature of the camera field of view area 2°C higher than the ambient temperature with a heating power of 10-20W. When the defrost mode is maintenance mode, the heating method is to maintain the temperature of the camera field of view area 2°C higher than the ambient temperature with a heating power of 5-15W.

[0031] To sum up, the defrosting method for the front windshield in the vehicle provided in the embodiment of the present application obtains the measurement value corresponding to each state when the new energy vehicle is in the starting state, driving state or parking state, and then determines the defrost mode matching the measurement value, and uses the heating method corresponding to the defrost mode to heat the camera field of view area, thereby ensuring that the camera field of view area is not blocked under different working conditions, ensuring that the auxiliary driving system can operate normally, and avoiding negative impact on driving safety. Moreover, compared with heating the entire windshield, heating only the camera field of view area can reduce the heating area and thus reduce the defrost time, and can also reduce power consumption and improve the endurance of new energy vehicles.

[0032] like Figure 2 As shown, it shows a flow chart of a defrosting method for a front windshield in a vehicle provided by an embodiment of the present application, and the defrosting method for a front windshield in a vehicle can be applied to new energy vehicles. The defrosting method for a front windshield in a vehicle may include: Step 201, 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.

[0033] Step 202, obtaining a measurement value corresponding to the current state through a sensor component in the new energy vehicle, wherein the measurement value includes a measurement value of at least one parameter of ambient temperature, humidity, ice thickness in the camera field of view, vehicle speed, and battery power.

[0034] The implementation process of steps 201-202 is detailed in the description of steps 101-102 and will not be repeated here.

[0035] Step 203: When the current state is the start state and the measured values ​​include the measured values ​​of the ambient temperature, humidity and ice thickness, the measured value of the ice thickness is compared with the thickness threshold.

[0036] In this embodiment, the thickness threshold can be set to the thickness of the ice layer that does not block the camera's field of view. For example, the thickness threshold is set to 0.5 mm. When the measured value of the ice layer thickness is less than 0.5 mm, the ice layer is 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 measured 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.

[0037] If the measured value of the ice thickness is less than the thickness threshold, step 204 is executed; if the measured value of the ice thickness is greater than or equal to the thickness threshold, step 205 is executed.

[0038] Step 204, if the measured value of the ice thickness is less than the thickness threshold, the measured values ​​of the ambient temperature and humidity are processed using the trained ice prediction model to obtain the ice probability; if the ice probability is greater than the probability threshold, it is determined that the defrost mode is a prevention mode, and step 206 is executed.

[0039] The icing prediction model is a model trained using historical data. The input data of the model is the measured values ​​of ambient temperature and humidity, and the output data is the probability of icing. The icing prediction model can be a deep learning model, such as a Long Short-Term Memory (LSTM) model.

[0040] After the icing probability is obtained, the icing probability and the probability threshold are compared. If the icing probability is greater than the probability threshold, the defrosting mode is determined to be the prevention mode; if the icing probability is less than or equal to the probability threshold, defrosting is not performed. The probability threshold is a preset value, usually greater than 50%.

[0041] Step 205 , if the measured value of the ice thickness is greater than or equal to the thickness threshold, it is determined that the defrost mode is the emergency mode, and step 207 is executed.

[0042] Step 206 , when the defrost mode is the prevention mode, the resistance wire located around the camera field of view is controlled to heat with a first power so that the temperature value of the camera field of view is higher than the measured value of the ambient temperature by a first threshold value.

[0043] The first power may be any value within a power range, for example, if the power range is 5-15 W, the first power may be set to 10 W. The value of the first threshold may be preset, for example, the first threshold is 3. Correspondingly, when the defrost mode is the prevention mode, the heating method is to maintain the temperature of the camera field of view 3°C higher than the ambient temperature with a heating power of 10 W.

[0044] Step 207, when the defrost mode is the emergency mode, the resistance wire located around the camera field of view is controlled to heat with the second power to melt the ice layer in the camera field of view.

[0045] The value of the second power can be preset.

[0046] In one example, when the defrost mode is the emergency mode, the heating method is to heat the camera field of view 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, such as the power density in the central area is 3W / cm 2 (To achieve the purpose of rapid ice melting), the power density in the outer area is 1.5W / cm 2 (To prevent the melt water from freezing again).

[0047] To sum up, the defrosting method for the front windshield in the vehicle provided in the embodiment of the present application obtains the measurement value corresponding to each state when the new energy vehicle is in the starting state, driving state or parking state, and then determines the defrost mode matching the measurement value, and uses the heating method corresponding to the defrost mode to heat the camera field of view area, thereby ensuring that the camera field of view area is not blocked under different working conditions, ensuring that the auxiliary driving system can operate normally, and avoiding negative impact on driving safety. Moreover, compared with heating the entire windshield, heating only the camera field of view area can reduce the heating area and thus reduce the defrost time, and can also reduce power consumption and improve the endurance of new energy vehicles.

[0048] like Figure 3 As shown, it shows a flow chart of a defrosting method for a front windshield in a vehicle provided by an embodiment of the present application, and the defrosting method for a front windshield in a vehicle can be applied to new energy vehicles. The defrosting method for a front windshield in a vehicle may include: Step 301, 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.

[0049] Step 302, obtaining measurement values ​​corresponding to the current state through the sensor components in the new energy vehicle, the measurement values ​​including the measurement values ​​of at least one parameter of the ambient temperature, humidity, ice thickness in the camera field of view, vehicle speed, and battery power.

[0050] The implementation process of steps 301-302 is detailed in the description of steps 101-102 and will not be repeated here.

[0051] Step 303: When the current state is the driving state and the measured values ​​include the measured values ​​of ice thickness, vehicle speed and battery power, compare the measured value of ice thickness with a thickness threshold.

[0052] In this embodiment, the thickness threshold can be set to the thickness of the ice layer that does not block the camera's field of view. For example, the thickness threshold is set to 0.5 mm. When the measured value of the ice layer thickness is less than 0.5 mm, the ice layer is 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 measured 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.

[0053] If the measured value of the ice thickness is less than the thickness threshold, step 304 is executed; if the measured value of the ice thickness is greater than or equal to the thickness threshold, step 308 is executed.

[0054] Step 304: If the measured value of the ice thickness is less than the thickness threshold, determine whether the new energy vehicle is traveling at a high speed or a low speed based on the measured value of the vehicle speed.

[0055] Specifically, a speed threshold may be pre-set, and the measured value of the vehicle speed may be compared with the speed threshold; if the measured value of the vehicle speed is greater than or equal to the speed threshold, it is determined that the new energy vehicle is traveling at a high speed; if the measured value of the vehicle speed is less than the speed threshold, it is determined that the new energy vehicle is traveling at a low speed, and step 307 is executed.

[0056] After determining that the new energy vehicle is traveling at a high speed, it is also necessary to determine whether the new energy vehicle has sufficient power. Specifically, the measured value of the battery power can be compared with the power threshold; if the measured value of the battery power is greater than or equal to the power threshold, it is determined that the power is sufficient, and step 305 is executed; if the measured value of the battery power is less than the power threshold, it is determined that the power is insufficient, and step 306 is executed.

[0057] Step 305 , if the new energy vehicle is traveling at high speed and the measured value of the battery power is greater than or equal to the power threshold, it is determined that the defrost mode is the high-speed mode, and step 309 is executed.

[0058] Step 306 , if the new energy vehicle is traveling at high speed and the measured value of the battery power is less than the power threshold, it is determined that the defrost mode is an energy-saving mode, and step 310 is executed.

[0059] Step 307 , if the new energy vehicle is traveling at a low speed, it is determined that the defrost mode is a congestion mode, and step 311 is executed.

[0060] In step 308 , if the measured value of the ice thickness is greater than or equal to the thickness threshold, it is determined that the defrost mode is the emergency mode, and step 312 is executed.

[0061] Step 309, when the defrost mode is a high-speed mode, determine a first target temperature value that is higher than the measured value of the ambient temperature by a second threshold value, use a power formula to calculate dynamic power based on the measured values ​​of the ambient temperature, humidity and vehicle speed and the first target temperature value, and use dynamic power to control the heating of the resistance wire located around the camera's field of view area 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.

[0062] The value of the second threshold can be preset.

[0063] When the defrost mode is high-speed mode, the heating method is to adjust the dynamic power of the heating according to the different wind resistances corresponding to different vehicle speeds, and heat the camera field of view area through the dynamic power.

[0064] The dynamic power calculation formula is: , where P represents dynamic power, Kp represents the proportional-integral-derivative (PID) proportional coefficient (such as 0.8, which can be adjusted dynamically), 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.

[0065] In this embodiment, the resistance 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.

[0066] For example, Trea = -10℃, Ttar = 5℃, relative humidity is 80%, the measured speed is 60km / 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 are 30-50W, so the final output dynamic power is 30W.

[0067] Step 310, when the defrost mode is the energy-saving mode, the resistance wire located around the camera field of view is controlled to heat up with a third power, and the third power is less than the dynamic power.

[0068] When the defrost mode is the energy-saving mode, the heating power needs to be lowered compared to the high-speed mode, giving priority to ensuring the normal driving of the vehicle. That is, the third power is less than the dynamic power.

[0069] In one example, the heating method of the energy-saving mode is to maintain the temperature of the camera field of view area 2°C higher than the ambient temperature with a heating power of 10-20W.

[0070] Step 311, when the defrost mode is the congestion mode, the resistance wire located around the camera field of view is controlled to heat up with the fourth power so that the temperature value of the camera field of view reaches the 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 value, and the fourth power is greater than the dynamic power.

[0071] When the defrost mode is the congestion mode, there is no wind resistance to assist defrosting, and the heating power needs to be increased compared to the high-speed mode to keep the temperature of the camera field of view higher than the ambient temperature. That is, the fourth power is greater than the dynamic power.

[0072] In one example, the heating method of the energy-saving mode is to maintain the temperature of the camera field of view area 3°C higher than the ambient temperature with a heating power of 5-15W.

[0073] Step 312, when the defrost mode is the emergency mode, the resistance wire located around the camera field of view is controlled to heat with a second power to melt the ice layer in the camera field of view.

[0074] The value of the second power can be preset.

[0075] In one example, when the defrost mode is the emergency mode, the heating method is to heat the camera field of view 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, such as the power density in the central area is 3W / cm 2 (To achieve the purpose of rapid ice melting), the power density in the outer area is 1.5W / cm 2 (To prevent the melt water from freezing again).

[0076] To sum up, the defrosting method for the front windshield in the vehicle provided in the embodiment of the present application obtains the measurement value corresponding to each state when the new energy vehicle is in the starting state, driving state or parking state, and then determines the defrost mode matching the measurement value, and uses the heating method corresponding to the defrost mode to heat the camera field of view area, thereby ensuring that the camera field of view area is not blocked under different working conditions, ensuring that the auxiliary driving system can operate normally, and avoiding negative impact on driving safety. Moreover, compared with heating the entire windshield, heating only the camera field of view area can reduce the heating area and thus reduce the defrost time, and can also reduce power consumption and improve the endurance of new energy vehicles.

[0077] When the defrost mode is the high-speed mode, the power formula is used to calculate the dynamic power based on the measured values ​​of the ambient temperature, humidity and vehicle speed and the first target temperature value. The dynamic power is used to control the heating of the resistance wire located around the camera field of view. The power formula is generated based on the phenomenon of wind resistance assisted defrosting. In this way, high-speed airflow can be used to accelerate the evaporation of melt water, thereby reducing heating energy consumption.

[0078] like Figure 4 As shown, it shows a flow chart of a defrosting method for a front windshield in a vehicle provided by an embodiment of the present application, and the defrosting method for a front windshield in a vehicle can be applied to new energy vehicles. The defrosting method for a front windshield in a vehicle may include: Step 401, 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.

[0079] Step 402, obtaining measurement values ​​corresponding to the current state through the sensor components in the new energy vehicle, the measurement values ​​including the measurement values ​​of at least one parameter of the ambient temperature, humidity, ice thickness in the camera field of view, vehicle speed, and battery power.

[0080] The implementation process of steps 401-402 is detailed in the description of steps 101-102 and will not be repeated here.

[0081] Step 403: 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.

[0082] Compare the measured value of the battery power with the power threshold; if the measured 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 measured value of the battery power is less than the power threshold, it is determined that the power is insufficient and defrosting is not performed.

[0083] Step 404 : If the measured value of the battery power is greater than or equal to the power threshold, it is determined that the defrost mode is the maintenance mode.

[0084] Step 405, when the defrost mode is the maintenance mode, the resistance wire located around the camera field of view is controlled to heat with a fifth power so that the temperature value of the camera field of view is higher than the measured value of the ambient temperature by a fourth threshold.

[0085] When the defrost mode is maintenance mode, the temperature of the camera area is kept slightly higher than the ambient temperature to maintain the state of preventing icing.

[0086] In one example, the heating method of the maintenance mode is to maintain the temperature of the camera field of view area 2°C higher than the ambient temperature with a heating power of 5-15W.

[0087] To sum up, the defrosting method for the front windshield in the vehicle provided in the embodiment of the present application obtains the measurement value corresponding to each state when the new energy vehicle is in the starting state, driving state or parking state, and then determines the defrost mode matching the measurement value, and uses the heating method corresponding to the defrost mode to heat the camera field of view area, thereby ensuring that the camera field of view area is not blocked under different working conditions, ensuring that the auxiliary driving system can operate normally, and avoiding negative impact on driving safety. Moreover, compared with heating the entire windshield, heating only the camera field of view area can reduce the heating area and thus reduce the defrost time, and can also reduce power consumption and improve the endurance of new energy vehicles.

[0088] like Figure 5As shown, it shows a structural block diagram of a defrosting device for a front windshield in a vehicle provided by an embodiment of the present application, and the defrosting device for a front windshield in the vehicle can be applied to new energy vehicles. The defrosting device for a front windshield in the vehicle may include: An acquisition module 510 is used 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; The acquisition module 510 is further used to acquire a measurement value corresponding to the current state through a sensor component in the new energy vehicle, the measurement value including a measurement value of at least one parameter of ambient temperature, humidity, ice thickness in the camera field of view, vehicle speed, and battery power; a determination module 520, for determining a defrost mode that matches the measured value, wherein the defrost 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 defrost mode when the predicted probability of icing in the startup state is greater than a probability threshold. The emergency mode is a defrost mode when the camera field of view is blocked by ice in the startup state or in the driving state. The high-speed mode is a defrost mode with wind resistance assisting defrosting in the high-speed driving state. The congestion mode is a defrost mode with no wind resistance assisting defrosting in the low-speed driving state. The energy-saving mode is a defrost mode when the battery power is lower than the battery power threshold in the driving state. The maintenance mode is a defrost mode in the parking state. The defrost module 530 is used to heat the camera field of view area by adopting a heating method corresponding to the matched defrost mode so that the camera field of view area is not blocked by the ice layer.

[0089] In an optional embodiment, the determination module 520 is further configured to: When the current state is the start state and the measured values ​​include the measured values ​​of the ambient temperature, humidity and ice thickness, comparing the measured value of the ice thickness with the thickness threshold; If the measured value of ice thickness is less than the thickness threshold, the measured values ​​of ambient temperature and humidity are processed using the trained ice prediction model to obtain the ice probability; if the ice probability is greater than the probability threshold, the defrost mode is determined to be a prevention mode; If the measured value of the ice thickness is greater than or equal to the thickness threshold, it is determined that the defrost mode is the emergency mode.

[0090] In an optional embodiment, the defrost module 530 is further configured to: When the defrost mode is the prevention mode, the resistance wire located around the camera field of view is controlled to heat with a first power so that the temperature value of the camera field of view is higher than the measured value of the ambient temperature by a first threshold value; When the defrost mode is the emergency mode, the resistance wire located around the camera field of view is controlled to heat with the second power to melt the ice layer in the camera field of view.

[0091] In an optional embodiment, the determination module 520 is further configured to: When the current state is a driving state and the measured values ​​include the measured values ​​of ice thickness, vehicle speed and battery power, comparing the measured value of ice thickness with a thickness threshold; If the measured value of the ice thickness is less than the thickness threshold, it is determined whether the new energy vehicle is traveling at a high speed or a low speed according to the measured value of the vehicle speed; if the new energy vehicle is traveling at a high speed and the measured value of the battery power is greater than or equal to the power threshold, it is determined that the defrost mode is a high speed mode; if the new energy vehicle is traveling at a high speed and the measured value of the battery power is less than the power threshold, it is determined that the defrost mode is an energy-saving mode; if the new energy vehicle is traveling at a low speed, it is determined that the defrost mode is a congestion mode; If the measured value of the ice thickness is greater than or equal to the thickness threshold, it is determined that the defrost mode is the emergency mode.

[0092] In an optional embodiment, the defrost module 530 is further configured to: When the defrost mode is a high-speed mode, a first target temperature value higher than the measured value of the ambient temperature by a second threshold value is determined, and a power formula is used to calculate dynamic power based on the measured values ​​of the ambient temperature, humidity and vehicle speed and the first target temperature value, and the resistance wire located around the camera field of view is controlled to heat up with the dynamic power so that the temperature value of the camera field of view reaches the first target temperature value, wherein the power formula is a formula generated based on the phenomenon of wind resistance assisting defrosting; When the defrost mode is the energy-saving mode, the resistance wire located around the camera field of view is controlled to heat with a third power, and the third power is less than the dynamic power; When the defrost mode is a congestion mode, the resistance wire located around the camera field of view is controlled to heat with a fourth power so that the temperature value of the camera field of view reaches a second target temperature value, 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; When the defrost mode is the emergency mode, the resistance wire located around the camera field of view is controlled to heat with the second power to melt the ice layer in the camera field of view.

[0093] In an optional embodiment, the determination module 520 is further configured to: When the current state is a parking state and the measured value includes a measured value of the battery power, comparing the measured value of the battery power with a power threshold; If the measured value of the battery charge is greater than or equal to the charge threshold, it is determined that the defrost mode is a maintenance mode.

[0094] In an optional embodiment, the defrost module 530 is further configured to: When the defrost mode is the maintenance mode, the resistance wire located around the camera field of view is controlled to heat with a fifth power so that the temperature value of the camera field of view is higher than the measured value of the ambient temperature by a fourth threshold.

[0095] To sum up, the defrost device for the front windshield in the vehicle provided in the embodiment of the present application obtains the measurement value corresponding to each state when the new energy vehicle is in the starting state, driving state or parking state, and then determines the defrost mode matching the measurement value, and uses the heating method corresponding to the defrost mode to heat the camera field of view area, thereby ensuring that the camera field of view area is not blocked under different working conditions, ensuring that the auxiliary driving system can operate normally, and avoiding negative impact on driving safety. Moreover, compared with heating the entire windshield, heating only the camera field of view area can reduce the heating area and thus reduce the defrost time, and can also reduce power consumption and improve the endurance of new energy vehicles.

[0096] When the defrost mode is the high-speed mode, the power formula is used to calculate the dynamic power based on the measured values ​​of the ambient temperature, humidity and vehicle speed and the first target temperature value. The dynamic power is used to control the heating of the resistance wire located around the camera field of view. The power formula is generated based on the phenomenon of wind resistance assisted defrosting. In this way, high-speed airflow can be used to accelerate the evaporation of melt water, thereby reducing heating energy consumption.

[0097] An embodiment of the present application provides a computer-readable storage medium, wherein the storage medium stores at least one instruction, and the at least one instruction is loaded and executed by a processor to implement the above-mentioned method for defrosting a front windshield in a vehicle.

[0098] An embodiment of the present application provides a new energy vehicle, which includes a defrosting device for the front windshield in any of the above-mentioned vehicles.

[0099] It should be noted that: the defrosting device for the front windshield of the vehicle provided in the above embodiment only uses the division of the above functional modules as an example to illustrate when defrosting the front windshield of the vehicle. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the defrosting device for the front windshield of the vehicle is divided into different functional modules to complete all or part of the functions described above. In addition, the defrosting device for the front windshield of the vehicle provided in the above embodiment and the embodiment of the defrosting method for the front windshield of the vehicle belong to the same concept. The specific implementation process is detailed in the method embodiment and will not be repeated here.

[0100] A person skilled in the art will understand that all or part of the steps to implement the above embodiments may be accomplished by hardware or by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a disk or an optical disk, etc.

[0101] The above description is not intended to limit the embodiments of the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present application should be included in the protection scope of the embodiments of the present application.

Claims

1. A method for defrosting a front windshield in a vehicle, characterized in that: The method comprises: 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; Acquiring a measurement value corresponding to the current state through a sensor component in the new energy vehicle, the measurement value comprising a measurement value of at least one parameter of ambient temperature, humidity, ice thickness in a camera field of view, vehicle speed, and battery power; Determine a defrost mode that matches the measured value, the defrost mode being one of a preventive mode, an emergency mode, a high-speed mode, a congestion mode, an energy-saving mode, and a maintenance mode, the preventive mode being a defrost mode when the predicted probability of icing in a startup state is greater than a probability threshold, the emergency mode being a defrost mode when the camera field of view is blocked by ice in a startup state or a driving state, the high-speed mode being a defrost mode with wind resistance assisting defrost in a high-speed driving state, the congestion mode being a defrost mode with no wind resistance assisting defrost in a low-speed driving state, the energy-saving mode being a defrost mode when the battery level is lower than a battery level threshold in a driving state, and the maintenance mode being a defrost mode in a parking state; The camera field of view area is heated by adopting a heating method corresponding to the matched defrost mode so that the camera field of view area is not blocked by the ice layer.

2. The method for defrosting the front windshield of a vehicle according to claim 1, characterized in that: The determining a defrost mode matching the measured value comprises: When the current state is a startup state and the measured values ​​include the measured values ​​of the ambient temperature, the humidity and the ice thickness, comparing the measured value of the ice thickness with a thickness threshold; If the measured value of the ice thickness is less than the thickness threshold, the measured values ​​of the ambient temperature and the humidity are processed using a trained ice prediction model to obtain an ice probability; if the ice probability is greater than the probability threshold, it is determined that the defrost mode is a prevention mode; If the measured value of the ice thickness is greater than or equal to the thickness threshold, it is determined that the defrost mode is an emergency mode.

3. The method for defrosting the front windshield of a vehicle according to claim 2, characterized in that: The step of heating the camera field of view area by using a heating method corresponding to the matched defrost mode includes: When the defrost mode is a prevention mode, controlling the resistance wire located around the camera field of view to heat with a first power, so that the temperature value of the camera field of view is higher than the measured value of the ambient temperature by a first threshold value; When the defrost mode is an emergency mode, the resistance wire located around the camera field of view is controlled to heat with a second power to melt the ice layer in the camera field of view.

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

5. The method for defrosting the front windshield of a vehicle according to claim 4, characterized in that: The measured values ​​also include the measured values ​​of the ambient temperature and the humidity, and the heating method corresponding to the matched defrost mode is used to heat the camera field of view area, including: When the defrost mode is a high-speed mode, determining a first target temperature value that is higher than the measured value of the ambient temperature by a second threshold, calculating dynamic power using a power formula for the measured values ​​of the ambient temperature, the humidity, and the vehicle speed, and the first target temperature value, and controlling the heating of a resistance wire located around the camera field of view area with the dynamic power so that the temperature value of the camera field of view area reaches the first target temperature value, the power formula being a formula generated based on a phenomenon in which wind resistance assists defrosting; When the defrost mode is an energy-saving mode, the resistance wire located around the camera field of view is controlled to heat with a third power, and the third power is less than the dynamic power; When the defrost mode is a congestion mode, the resistance wire located around the camera field of view is controlled to heat with a fourth power so that the temperature value of the camera field of view reaches a second target temperature value, 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; When the defrost mode is an emergency mode, the resistance wire located around the camera field of view is controlled to heat with a second power to melt the ice layer in the camera field of view.

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

7. The method for defrosting the front windshield of a vehicle according to claim 6, characterized in that: The measured value also includes the measured value of the ambient temperature, and the heating method corresponding to the matched defrost mode is used to heat the camera field of view area, including: When the defrost mode is a maintenance mode, the resistance wire located around the camera field of view is controlled to heat with a fifth power so that the temperature value of the camera field of view is higher than the measured 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 comprises: An acquisition module, used to acquire the current state of the new energy vehicle, wherein the current state is one of a starting state, a driving state and a parking state; The acquisition module is further used to acquire a measurement value corresponding to the current state through a sensor component in the new energy vehicle, wherein the measurement value includes a measurement value of at least one parameter of ambient temperature, humidity, ice thickness in a camera field of view, vehicle speed, and battery power; a determination module, for determining a defrost mode matching the measured value, the defrost mode being 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 defrost mode when the predicted probability of icing in a startup state is greater than a probability threshold; the emergency mode is a defrost mode when the camera field of view is blocked by ice in a startup state or a driving state; the high-speed mode is a defrost mode with wind resistance assisting defrost in a high-speed driving state; the congestion mode is a defrost mode with no wind resistance assisting defrost in a low-speed driving state; the energy-saving mode is a defrost mode when the battery level is lower than a battery level threshold in a driving state; and the maintenance mode is a defrost mode in a parking state; The defrost module is used to heat the camera field of view area by adopting a heating method corresponding to the matched defrost mode so that the camera field of view area is not blocked by the ice layer.

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

10. A new energy vehicle, characterized in that: The new energy vehicle comprises the defrosting device for the front windshield in the vehicle as claimed in claim 8.

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