Vehicle defogging device, control method thereof, and storage medium
Patent Information
- Application Number
- CN202611339298.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-08-31
- Publication Date
- 2026-10-16
Smart Images
Figure CN122915015A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of vehicle control technology, and in particular to a vehicle defogging device, its control method, and a storage medium. Background Technology
[0002] In intelligent driving vehicles, the in-cabin lidar usually needs to penetrate the windshield to perceive the environment, and existing defrosting and defogging methods mostly use glass heating wires or heating films.
[0003] However, the heating wire is limited by the optical field of view, which restricts the heating coverage and power output, making it difficult to achieve rapid defrosting and defogging of the target area. Although the heating film can achieve heating over a larger area, the heat conduction path is long, and the initial temperature rise is delayed, which can easily lead to insufficient clearing efficiency of the sensing area. At the same time, it is difficult to balance overall power consumption and temperature uniformity.
[0004] Therefore, how to remove fog or frost from the windshield of a vehicle in a timely manner has become a technical problem that urgently needs to be solved. Summary of the Invention
[0005] This application provides a vehicle defogging device, its control method, and a storage medium to achieve timely defogging of the vehicle.
[0006] In a first aspect, embodiments of this application provide a vehicle defogging device, comprising:
[0007] A vision sensor is installed on the inside of the windshield in front of the vehicle's cockpit to acquire image information;
[0008] The first heating element is disposed on the inner surface of the windshield and away from the field of view of the vision sensor, and is used to defog the field of view of the vision sensor when heated.
[0009] The second heating element is evenly disposed on the inner surface of the cover. The cover is disposed on the inside of the windshield and its inner surface is concave. The inner surface of the cover does not adhere to the inner surface of the windshield. The concave surface covers the vision sensor and the first heating element, and works together with the first heating element to defog the field of view area.
[0010] The vehicle body domain controller is electrically connected to the first heating element and the second heating element, and is used to control the first heating element and the second heating element to perform heating.
[0011] In one possible embodiment, the first heating element is a heating wire, which is bent at equal intervals and disposed within the coverage area of the cover, and the second heating element is a heating film.
[0012] In one possible embodiment, the vehicle defogging device further includes:
[0013] The driver assistance domain controller communicates with the body domain controller and is used to send defogging commands to the body domain controller, so that the body domain controller controls the first heating element and the second heating element to heat.
[0014] In one possible embodiment, the vehicle defogging device further includes:
[0015] A power supply, electrically connected to the first heating element and the second heating element, is used to supply power to the first heating element and the second heating element.
[0016] A relay is electrically connected to a power source and is used to control the opening or closing of a power circuit.
[0017] Secondly, embodiments of this application provide a control method for a vehicle defogging device, applied to a vehicle defogging device including the above-mentioned method, comprising:
[0018] Upon receiving a defogging command, the ambient temperature is obtained, which represents the temperature inside the vehicle.
[0019] The control duration is determined based on the ambient temperature. The control duration includes the power-on duration and the power-off duration. The control duration is divided into the first control duration corresponding to the first heating element and the second control duration corresponding to the second heating element.
[0020] The first heating element is controlled to heat according to the first control duration, and the second heating element is controlled to heat according to the second control duration, so as to defog the vehicle.
[0021] In one possible embodiment, the defogging command is generated and sent to the vehicle domain controller when the ambient temperature is less than or equal to the dew point temperature, after the driver domain controller acquires temperature and humidity data and calculates the dew point temperature.
[0022] In one possible embodiment, determining the control duration based on the ambient temperature includes:
[0023] Determine the target temperature range, which includes ambient temperature;
[0024] Determine the initial power-on duration, steady-state power-off duration, and steady-state power-on duration corresponding to the target temperature range, and calculate the control duration.
[0025] In one possible embodiment, calculating the control duration includes:
[0026] The duration of the period is obtained by summing the steady-state power-off duration and the steady-state power-on duration.
[0027] The control duration is obtained by summing the product of the cycle length and the number of cycles with the initial energization duration.
[0028] In one possible embodiment, after simultaneously controlling the second heating element to heat according to the second control duration, the method further includes:
[0029] Gain silence time;
[0030] The first and second heating elements are powered off and wait during the silent period.
[0031] Thirdly, embodiments of this application provide a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, are used to implement the methods provided above.
[0032] The vehicle defogging device, its control method, and storage medium provided in this application embodiment, by setting a first heating element on the inside of the windshield that avoids the field of view of the visual sensor, and combining it with a second heating element set on the inner surface of the cover, and by having the vehicle domain controller control the heating of the first heating element and the second heating element, can form a synergistic defogging effect on the corresponding field of view area without affecting the field of view of the visual sensor, thereby improving the defogging efficiency of the target area of the windshield, and taking into account the power consumption and temperature control effect, so as to achieve the effect of timely defogging. Attached Figure Description
[0033] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.
[0034] Figure 1 A front view of the vehicle defogging device provided in this application;
[0035] Figure 2 Rear view of the vehicle defrosting device provided in this application;
[0036] Figure 3 Flowchart of the control method for the vehicle defrosting device provided in this application Figure 1 ;
[0037] Figure 4 Flowchart of the control method for the vehicle defrosting device provided in this application Figure 2 ;
[0038] Figure 5 A schematic diagram of the control device for the vehicle defogging device provided in this application;
[0039] Figure 6 A schematic diagram of the structure of the vehicle domain controller provided in this application.
[0040] The above figures include the following reference numerals:
[0041] 10-Vision sensor; 11-First heating element; 12-Second heating element; 13-Heating head; 14-Cover; 15-Windshield; 16-Rearview mirror.
[0042] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation
[0043] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.
[0044] First, let me explain the terms used in this application:
[0045] Dew point temperature: The temperature at which air cools to saturation with constant water vapor content and air pressure. It is used to assess the risk of condensation. When the glass surface temperature is less than or equal to the dew point temperature, water vapor in the air will condense into liquid water, requiring heating to raise the surface temperature to prevent condensation.
[0046] This application applies to scenarios where visual sensors (e.g., lidar or cameras) are positioned in front of the vehicle's cockpit and obtain forward road image information through the windshield.
[0047] In existing technologies, common solutions include placing heating wires on the inside of the windshield to increase the local temperature of the glass through resistance heating, thereby eliminating fog on the glass surface; or placing a heating film near the sensor to improve the local ambient temperature through large-area heating, thus indirectly achieving defogging. The basic premise of these solutions is to increase the temperature near the windshield and reduce water vapor condensation in the field of view of the vision sensor.
[0048] However, in practical applications, heating wires usually need to avoid the field of view of vision sensors to prevent obstructing imaging or affecting light transmission. Therefore, their placement area and output power are limited, making it difficult to achieve sufficient and rapid heat coverage of the target field of view. Although heating films can expand the heating range, if they are directly applied near the key field of view area of the windshield, the impact on imaging, heat conduction efficiency, and local temperature rise uniformity still need to be considered. In the initial stage of vehicle startup, they are also prone to insufficient defogging response due to delayed heating.
[0049] The aforementioned defects can cause residual fog to remain in the field of view of the vision sensor in low temperature, high humidity, or for a short period after the vehicle starts, affecting image clarity and perception reliability. At the same time, it is difficult to balance defogging efficiency, overall power consumption, and temperature control with a single heating method, resulting in problems such as slow defogging speed, low energy utilization, and uneven local heat distribution in practical applications.
[0050] Based on the above scenarios, it can be seen that in the existing technology, there is a technical problem that the frost and fog on the vehicle cannot be removed in time, which leads to the obstruction of the lidar's field of view.
[0051] The vehicle defogging device provided in this application uses a visual sensor for acquiring image information, arranges a first heating element on the inside of the windshield that avoids the field of vision, and uniformly arranges a second heating element on the inner surface of a concave cover that covers the visual sensor and the first heating element. The vehicle domain controller controls the heating of the first heating element and the second heating element, thereby working together to defog the field of vision.
[0052] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.
[0053] Figure 1 This is a schematic diagram of a vehicle defrosting device provided in this application. This diagram can be understood as a schematic view taken from the outside of the windshield in front of the vehicle's driver's compartment. Figure 1 As shown, the device includes: a vision sensor 10, a first heating element 11, a second heating element 12, and a vehicle body domain controller; it also includes a heating head 13.
[0054] Figure 2 This is a schematic diagram of another vehicle defogging device provided in this application. This diagram can be understood as a schematic view observed from inside the vehicle's driver's cabin. Figure 2 As shown. Due to Figure 2 This is a schematic diagram from inside the vehicle; therefore, components such as the visual sensor 10 and the first heating element 11, which are covered by the cover 14, are not observable. The windshield 15, the second heating element 12, and the cover 14 are visible from this viewpoint, as is the rearview mirror 16.
[0055] The vision sensor 10 is located inside the windshield 15 in front of the vehicle's driver's cabin and is used to acquire image information;
[0056] The first heating element 11 is disposed on the inner surface of the windshield 15 and avoids the field of view of the vision sensor 10, and is used to defog the field of view when heated.
[0057] The second heating element 12 is evenly disposed on the inner surface of the cover 14. The cover 14 is disposed inside the windshield 15 and its inner surface is concave. The inner surface of the cover 14 does not adhere to the inner surface of the windshield 15. The concave surface covers the vision sensor 10 and the first heating element 11 and works together with the first heating element 11 to defog the field of view area.
[0058] The vehicle body domain controller is electrically connected to the first heating element 11 and the second heating element 12, and is used to control the first heating element 11 and the second heating element 12 to perform heating.
[0059] Among them, the vision sensor 10 is a sensing device used to acquire image information in front of the vehicle. Its function is to provide image input to the vehicle's environment recognition, assisted driving decision-making or field of vision monitoring.
[0060] In terms of position and relationship, the vision sensor 10 is installed inside the windshield 15 in front of the vehicle's cockpit. It is usually located in the installation area behind the windshield 15 and is arranged facing the forward field of vision area so as to collect external image information through the windshield 15 and together with the first heating element 11 and the second heating element 12 define the target area to be defogged.
[0061] In one possible embodiment, the visual sensor 10 may be a lidar, a camera module, a monocular imaging unit, a binocular vision unit, or a composite sensor module that includes infrared and visible light detectors. It should be understood that the above examples are merely illustrative and not limiting.
[0062] In terms of size and proportion, its external dimensions can be miniaturized according to the installation space, for example, the length, width and thickness are in the range of several centimeters, and its effective field of view is matched with the coverage of a local area of the windshield 15 to ensure that its imaging optical path is not blocked by the heating structure.
[0063] The first heating element 11 is a local heating component disposed on the inner surface of the windshield 15 and avoiding the field of view of the vision sensor 10. Its function is to defog the field of view of the vision sensor 10 after power is applied, thereby improving the light transmittance of the area.
[0064] In terms of position and relationship, the first heating element 11 is attached to the inner surface of the windshield 15 and located outside the field of view of the vision sensor 10, so as to avoid obstructing the imaging light path of the vision sensor 10 and to form local thermal compensation for the target area. It and the second heating element 12 cooperate with each other in function and jointly cover the defogging range in space.
[0065] In one possible embodiment, the first heating element 11 may be a curved heating wire, and the material may include nickel-chromium alloy, iron-chromium-aluminum alloy, silver paste or copper alloy, and may be fixed to the glass surface by an adhesive layer, a laminate or a printed layer; in terms of size and proportion, its line width, line spacing and coverage area are usually designed according to the ratio of the field of view area to the edge non-sensitive area, the wire diameter or bandwidth may be in the millimeter range, and the layout can be designed according to the defogging requirements to form a uniform thermal field and adapt to the local curved surface of the windshield 15.
[0066] The second heating element 12 is a wide-area heating component uniformly disposed on the inner surface of the cover 14, which can be called a heating film. Its function is to work together with the first heating element 11 to continuously defog the field of view area of the vision sensor 10.
[0067] In terms of position and relationship, the cover 14 is disposed inside the windshield 15 and its inner surface is concave. The concave surface covers the vision sensor 10 and the first heating element 11, and the inner surface of the cover 14 is not attached to the inner surface of the windshield 15, thereby forming a certain gap between the two and improving heat diffusion and local airflow organization. The second heating element 12 is arranged on the inner surface of the concave surface to cover the space near the vision sensor 10 and heat together with the first heating element 11.
[0068] In one possible embodiment, the second heating element 12 may be a heating film, and the material may include polyester film substrate, polyimide substrate, graphene composite material, etc. The cover 14 body may be made of plastic. It should be understood that the above examples are only illustrative and not limiting.
[0069] In terms of size and proportion, the vision sensor 10 can be disposed within the concave surface of the cover 14, and its coverage area should at least include the vision sensor 10 and the first heating element 11, while retaining an assembly gap, which can be on the order of several millimeters to several centimeters, to form a non-fitted structure and provide space for the transfer of heat inside the cover 14 and between the cover 14 and the windshield 15.
[0070] The vehicle body domain controller is an electronic control unit used to control the actuators related to the vehicle body. Its function is to be electrically connected to the first heating element 11 and the second heating element 12 and control them to heat. In terms of location and relationship, it can be installed in the vehicle's central control box, inside the dashboard, or in the domain controller position of the vehicle body electronic architecture, and is connected to the two heating elements respectively through wiring harness or power drive module to output controlled current or voltage signals to each heating element.
[0071] In one possible embodiment, the vehicle domain controller includes a microprocessor, power drive circuitry, and a communication interface, and its housing may be a plastic housing or a metal shielded housing.
[0072] In terms of size and proportion, its volume is adapted to the installation space of the vehicle controller, and its output power matches the rated power of the heating element to ensure that the current, voltage and heat dissipation conditions meet the working requirements.
[0073] The vehicle defogging device provided in this application, when the system is started, controls the first heating element 11 and the second heating element 12 to heat, so that the first heating element 11 forms a local heating area on the inner surface of the windshield 15, while the second heating element 12 forms a relatively continuous wide-area heating area within the concave surface of the cover 14; since the first heating element 11 is arranged away from the field of view of the vision sensor 10, it will not obstruct the imaging optical path of the vision sensor 10, and the heat it generates can directly act on the target field of view area corresponding to the inner side of the windshield 15, so that the local glass... The temperature of the glass rises and the conditions for water vapor condensation decrease; at the same time, the concave structure of the cover 14 encloses the vision sensor 10 and the first heating element 11 inside it, and the inner surface of the cover 14 does not adhere to the inner surface of the windshield 15, thereby forming a heat diffusion space between the cover 14 and the windshield 15. The second heating element 12 continuously heats this space and the inner surface of the cover 14, so that the heat can form a relatively continuous temperature distribution around the field of vision area, and together with the local heating of the first heating element 11, it compensates for the cold spot area in front of the vision sensor 10.
[0074] During this process, the vision sensor 10 remains in an unobstructed installation position and completes image acquisition. The defogging thermal field is established through the combined action of local and wide-area heating, thereby enabling faster dissipation of fog in the target field of view. Furthermore, the spatial relationship between the heating range and the imaging area remains stable, thus achieving defogging control of the windshield target area without affecting the field of view of the vision sensor 10, and maintaining consistent stability in heating response, heat coverage, and temperature distribution. It should be understood that the above example is merely illustrative and not limiting.
[0075] Without departing from the technical concept of this application, the vision sensor 10, the first heating element 11, the second heating element 12, and the vehicle domain controller can all be replaced by equivalent or structurally adjusted solutions.
[0076] Based on the aforementioned embodiments, the first heating element 11 is a heating wire, which is bent at equal intervals and disposed within the coverage area of the cover 14, and the second heating element 12 is a heating film.
[0077] In one possible embodiment, the heating wire can be made of nickel-chromium alloy wire, iron-chromium-aluminum alloy wire, or copper-nickel alloy wire. Alternatively, it can be a metal heating wire structure with a surface-coated insulating layer, which can be a silicone coating or a fiberglass coating to improve heat resistance, insulation, and long-term stability.
[0078] The heating wires can be arranged in a wavy, M-shaped, S-shaped or continuous arc path within the cover 14. The bending radius is adapted to the curvature of the inner surface of the cover 14. The equally spaced pitch can be adjusted according to the size of the windshield 15, the installation position of the vision sensor 10 and the required heating power, so that the heating wires can extend the heat-affected zone as much as possible while avoiding the field of view of the vision sensor 10.
[0079] The heating film can be a polyester-based heating film, a polyimide-based heating film, a graphene composite heating film, an ITO transparent conductive film, or a metal mesh film. It can be fixed to the inner surface of the cover 14 by lamination, hot pressing, or adhesive bonding to ensure a stable fit and good heat conduction path between it and the cover 14.
[0080] The thickness of the heating film is typically in the micrometer to sub-millimeter range, and its area preferably covers the defogging area corresponding to both the vision sensor 10 and the first heating element 11, or at least covers the main projection area of the inner surface of the cover 14, so as to ensure the uniform distribution of planar heat and form a superposition effect with the local heat generated by the heating wire.
[0081] When the system is started, the vehicle domain controller controls the power supply of the first heating element 11 and the second heating element 12 based on the temperature and humidity inside and outside the vehicle, the fogging status of the windshield 15, and the image clarity information of the vision sensor 10. The heating wire first generates linear heat along its equally spaced curved path, causing the local area near the windshield 15 within the coverage area of the cover 14 to heat up rapidly. Meanwhile, the heating film works synchronously or alternately under the control strategy to form a more uniform planar heat diffusion layer on the inner surface of the cover 14.
[0082] Because the bending path and spacing of the heating wire are preset, its heat can cover a wider non-imaging sensitive area without obstructing the field of view of the vision sensor 10; while the heating film compensates for the local heat area formed by the heating wire, so that the heat is continuously transferred to the windshield 15 and the field of view through the cover 14 and its inner air layer, thereby reducing the probability of water vapor condensation in the target area and accelerating the evaporation rate of the fog that has been formed.
[0083] Based on the above working process, it can be seen that the combination of linear rapid heating and surface uniform heating is beneficial to improving the defogging response speed and heat utilization efficiency, reducing local temperature difference and improving the defogging stability in low temperature and high humidity environments, thereby enabling the vision sensor 10 to recover clear images more quickly and improve the reliability of vehicle perception.
[0084] It should be understood that the above examples are merely illustrative and not limiting. Any equivalent substitutions or modifications made based on the technical concept of this application shall fall within the protection scope of this application.
[0085] Based on the foregoing embodiments, the vehicle defrosting device further includes:
[0086] The driver assistance domain controller is communicatively connected to the vehicle body domain controller and is used to send defogging commands to the vehicle body domain controller, so that the vehicle body domain controller controls the first heating element 11 and the second heating element 12 to perform heating.
[0087] In this application, the assisted driving domain controller is a domain-level control unit used to process vehicle assisted driving related information and generate control commands. Its function is to send a defogging request to the vehicle domain controller based on the image information output by the vision sensor 10, the vehicle's external environmental status, the temperature and humidity information inside and outside the vehicle, and the defogging demand judgment result, so as to trigger the first heating element 11 and the second heating element 12 to perform heating actions.
[0088] The driver assistance domain controller is typically located within the vehicle's driver assistance electronic architecture or central computing architecture, and forms a signal interaction relationship with the vision sensor 10, environmental sensor, vehicle communication network, and body domain controller. Its installation location can be set in the central control domain controller area, inside the driver assistance control box, or in a functional unit integrated with the vehicle control module. Data transmission with the body domain controller is achieved through the vehicle communication bus.
[0089] In one possible embodiment, the driver assistance domain controller may be a stand-alone controller, a software function module within a central processing platform, or an onboard computing unit with domain fusion capabilities. It should be understood that the above examples are merely illustrative and not limiting.
[0090] Its outer shell can be a metal shielding shell, an engineering plastic shell, or a combination of metal and plastic shell. The interior typically includes a processing chip, memory, communication interface, and power management circuit. The number of communication interfaces can be configured according to the number of sensors and controllers connected.
[0091] Its size is generally adapted to the installation space of the vehicle's electronic equipment. It can usually be set as a compact modular structure so that it can be installed under the dashboard, in the central tunnel area or in the controller compartment, and a wiring harness connection port for the body domain controller is reserved.
[0092] In one exemplary embodiment, the assisted driving domain controller can connect to the body domain controller via CAN (Controller Area Network) communication, LIN (Local Interconnect Network) communication, Ethernet communication, or vehicle-specific serial communication. When it receives fog detection results, a defogging activation signal, or a defogging request from the assisted driving strategy, it generates a corresponding defogging command and sends it to the body domain controller. After receiving the command, the body domain controller outputs drive current to the first heating element 11 and the second heating element 12 according to the current vehicle status, ambient temperature, and heating requirements, so that the two enter the heating state synchronously or in a preset sequence, thereby defogging the field of vision area of the windshield 15.
[0093] Since the driver assistance domain controller is responsible for upper-level policy judgment and command triggering, while the body domain controller is responsible for power distribution and heating control at the execution layer, the defogging action can be coordinated with the vehicle's driver assistance status, perception needs, and environmental changes, thereby improving the defogging response speed and control stability. It can also promptly start heating when fogging tends to appear in the field of view of the vision sensor 10, reducing the situation of image acquisition being obstructed.
[0094] Therefore, this communication and coordination mechanism enables the windshield target area to obtain more timely and uniform heat coverage without affecting the arrangement and light transmission performance of the vision sensor 10, thereby improving the defogging efficiency in low-temperature and high-humidity environments and helping to reduce the perception delay caused by localized heating lag. It should be understood that the above implementation is merely illustrative and not limiting. Without departing from the concept of this application, the communication protocol, message format, triggering conditions, and heating control strategy between the assisted driving domain controller and the body domain controller can be adjusted accordingly based on the vehicle's electronic and electrical architecture.
[0095] In one possible implementation, the vehicle defogging device further includes:
[0096] A power supply, electrically connected to the first heating element 11 and the second heating element 12, is used to supply power to the first heating element 11 and the second heating element 12;
[0097] A relay is electrically connected to a power source and is used to control the opening or closing of a power circuit.
[0098] In one possible embodiment, the rated output power of the power supply should cover the total power requirements of the first heating element 11 and the second heating element 12, and its output current capability should match the heating load to avoid slow heating response or unstable temperature rise due to insufficient power supply.
[0099] The contact capacity of the relay is matched with the operating current of the first heating element 11 and the second heating element 12, and the coil voltage or control terminal voltage is adapted to the vehicle's low-voltage system. Its dimensions are typically designed to be a compact structure that is easy to install near the vehicle's wiring harness box, distribution box, or controller. The length, width, and height can be adapted to the vehicle's electrical architecture.
[0100] During operation, the relay engages or disengages under the action of the control signal, thereby connecting or disconnecting the power supply circuit for the first heating element 11 and the second heating element 12, thus realizing unified start-stop control of the heating function.
[0101] When the system starts, after receiving the defogging command sent by the driver assistance domain controller, the vehicle domain controller first controls the power circuit to close via a relay, so as to establish a stable power supply path between the power supply and the first heating element 11 and the second heating element 12, and then the power supply outputs the corresponding voltage and current to the two types of heating elements.
[0102] At this time, the first heating element 11 directionally heats the part of the windshield 15 that avoids the field of view of the vision sensor 10 on the inner surface of the windshield 15, while the second heating element 12 forms a relatively uniform planar thermal field on the inner surface of the cover 14. The two work together on the basis of continuous power supply to gradually increase the temperature of the glass surface and the adjacent air layer near the field of view, thereby inhibiting water vapor condensation and accelerating the evaporation or dissipation of the fog that has been formed.
[0103] When the defogging is finished or the vehicle enters a non-heating condition, the controller drives the relay to release, the power circuit is quickly cut off, and the first heating element 11 and the second heating element 12 stop working to avoid unnecessary energy consumption and local overheating.
[0104] Based on the above-described process, it can be seen that this application achieves stable power supply, reliable switching, and safe isolation of the defogging heating circuit through a power supply control link composed of a power source and a relay. This ensures the defogging efficiency within the field of view of the vision sensor 10 while improving the stability and responsiveness of the vehicle's power supply management. It should be understood that the above example is merely illustrative and not limiting.
[0105] Figure 3 Flowchart of the control method for the vehicle defrosting device provided in this application Figure 1 ,like Figure 3 As shown, the method includes:
[0106] S201. Upon receiving a defogging command, obtain the ambient temperature, which represents the temperature inside the vehicle.
[0107] In this application, the main body implementing the control method is a vehicle defogging device, which includes a first heating element, a second heating element, and a vehicle body domain controller. The vehicle body domain controller is electrically connected to the first heating element and the second heating element, respectively, and is used to output corresponding heating control signals according to preset control logic.
[0108] The overall workflow under this structure is as follows: After receiving the defogging command, the vehicle domain controller obtains the ambient temperature inside the vehicle and determines the control duration based on the ambient temperature. The control duration corresponds to the first control duration of the first heating element and the second control duration of the second heating element. Subsequently, the vehicle domain controller controls the two heating elements to perform heating according to their respective power-on and power-off durations, thereby defogging the vehicle.
[0109] In this application, the temperature acquisition action occurs after receiving the defogging command, and the vehicle domain controller obtains the temperature value upon which the current defogging control is based. After receiving the defogging command, the vehicle domain controller does not immediately and continuously drive the first and second heating elements, but instead first enters the temperature determination process.
[0110] In terms of specific structural implementation, the vehicle domain controller, acting as the control execution center, maintains an electrical connection with the first and second heating elements. Therefore, it can complete the reception of defogging commands and the acquisition of ambient temperature within the control link. A crucial aspect of this step is that the ambient temperature acquired is the temperature inside the vehicle, not the outside temperature, and the acquisition time is limited to after receiving the defogging command. This ensures that the subsequent control duration corresponds to the current actual thermal environment inside the vehicle, rather than being executed unconditionally for a pre-fixed duration.
[0111] S202. The control duration is determined according to the ambient temperature. The control duration includes the power-on duration and the power-off duration. The control duration is divided into the first control duration corresponding to the first heating element and the second control duration corresponding to the second heating element.
[0112] Specifically, in this application, after obtaining the ambient temperature, the vehicle domain controller determines a first control duration and a second control duration based on the ambient temperature. Each control duration includes two parts: a power-on duration and a power-off duration. Since the heating objects and heating methods of the first and second heating elements can be different, their corresponding control durations do not need to be the same, but are determined separately by the vehicle domain controller.
[0113] For the first heating element, the first control duration is used to limit its operating cycle; for the second heating element, the second control duration is used to limit its operating cycle. The necessary additional implementation in this step is that the vehicle domain controller needs to output two sets of timing parameters separately, instead of applying a single control duration to both heating elements simultaneously; and the control duration explicitly includes the power-on duration and power-off duration, so that the two types of heating elements operate intermittently, rather than continuously heating after a single power-on.
[0114] S203. The first heating element is controlled to heat according to the first control duration, and the second heating element is controlled to heat according to the second control duration to defog the vehicle.
[0115] In this step, the first control duration is used to control the power-on and power-off cycle of the first heating element, and the second control duration is used to control the power-on and power-off cycle of the second heating element. The vehicle domain controller outputs control signals to the two heating elements according to the two sets of control durations determined in the previous step, so that the first heating element and the second heating element enter the defogging process synchronously.
[0116] In terms of information transmission, the acquired ambient temperature enters the vehicle body domain controller, which converts it into a first control duration and a second control duration. The vehicle body domain controller then converts this control duration into specific on / off control of the first and second heating elements, thereby completing the closed-loop control from ambient temperature acquisition and control duration calculation to heating execution.
[0117] The necessary implementation in this step also includes that the two types of heating elements are heated "simultaneously" under control. However, simultaneous control does not mean that the two elements are powered on for exactly the same duration. Rather, it means that the vehicle domain controller manages the two heating elements in parallel under the same defogging task, so that they work according to their respective control durations to complete the defogging of the vehicle.
[0118] This application provides a control method for a vehicle defogging device. Upon receiving a defogging command, the vehicle domain controller first acquires the ambient temperature inside the vehicle. Then, based on this ambient temperature, it determines a first control duration for a first heating element and a second control duration for a second heating element. The two heating elements are then driven to operate according to their respective control sequences, which include energization and de-energization durations. Thus, the two types of heating elements are controlled according to the control duration corresponding to the ambient temperature, allowing for targeted adjustment of the defogging process within the vehicle's interior environment. This ensures the heating cycle matches the current thermal environment, thereby achieving defogging control of the vehicle and realizing timely defogging.
[0119] Figure 4 Flowchart of the control method for the vehicle defrosting device provided in this application Figure 2 ,like Figure 4 As shown, in this embodiment... Figure 3 Based on the embodiments, the control method of the vehicle defrosting device is described in detail, and the method includes:
[0120] S301. Upon receiving a defogging command, acquire the ambient temperature, which represents the temperature inside the vehicle.
[0121] S302. Determine the target temperature range, including ambient temperature;
[0122] S303. Determine the initial power-on duration, steady-state power-off duration, and steady-state power-on duration corresponding to the target temperature range, and calculate the control duration.
[0123] Divide the temperature range and determine which temperature range the ambient temperature falls within. Each temperature range corresponds to a set of initial power-on duration, steady-state power-off duration, and steady-state power-on duration data.
[0124] Wherein, the initial power-on duration T0: represents the time when the heating wire or heating film starts heating at full power;
[0125] Steady-state power-off duration T1: This indicates the time for power-off and rest during overheating, mainly to ensure that the glass surface does not exceed 85°C.
[0126] Table 1
[0127]
[0128] Steady-state power-on duration data T2: indicates the time during which power is continuously supplied for defrosting and defogging;
[0129] Minimum heating time T min : Represents the minimum time required for each round of heating;
[0130] Silence Time T c This indicates that heating has stopped and a new round of assessment and waiting has begun.
[0131] The relationship between the ambient temperature of the first heating element and the control duration is shown in Table 1.
[0132] The relationship between the ambient temperature and control duration of the second heating element is shown in Table 2.
[0133] Table 2
[0134]
[0135] Step S303 can be achieved through the following steps:
[0136] Step S3031: Calculate the sum of the steady-state power-off duration and the steady-state power-on duration to obtain the cycle duration;
[0137] The cycle duration, T1 + T2, indicates that after the initial power-on time, in order to prevent the glass from overheating, a combination of power-on and power-off methods are used for heating. One power-on and one power-off cycle constitutes one cycle duration. The heating wire needs to cycle for at least 3 cycles, and the heating film needs to cycle for at least 3 cycles to achieve the best defogging effect and prevent the glass temperature from becoming too high.
[0138] Step S3032: Calculate the sum of the product of the cycle duration and the number of cycles and the initial energization duration to obtain the control duration.
[0139] Control duration, i.e., the aforementioned T min =T0+3(T1+T2) or T min =T0+4(T1+T2) represents the minimum heating time for each heating cycle.
[0140] S304. The first heating element is controlled to heat according to the first control duration, and the second heating element is controlled to heat according to the second control duration to defog the vehicle.
[0141] The first control duration is T0+3(T1+T2), which controls the heating duration of the first heating element to be T0+3(T1+T2); the second control duration is T0+3(T1+T2), which controls the heating duration of the first heating element to be T0+3(T1+T2).
[0142] S305, Obtain the silence time;
[0143] S306, Control the first heating element and the second heating element to be powered off and wait during the silent time.
[0144] Silence time is T c During this period, heating will cease, and a new round of judgment and waiting will begin.
[0145] When the ambient temperature T ≤ -15℃, the entire heating process is as follows:
[0146] The heating film was heated at full power for 9 minutes, and then the process was repeated 4 times in sequence: power off for 1 minute, power on for 2 minutes, and then silent for 7 minutes.
[0147] Meanwhile, the heating wire begins heating at full power for 12 minutes; then it executes three times: power off for 1 minute, power on for 3 minutes, and then silent for 7 minutes.
[0148] The time values in Tables 1 and 2 above were obtained through multiple sets of experiments. Under the condition that the temperature of the heating film does not exceed 93°C and the temperature inside the glass surface does not exceed 70°C, the above calibration values meet the following acceptance effects of defogging and defrosting, as shown in Table 3.
[0149] To verify the effectiveness of the embodiments of the present invention, simulation experiments were conducted in the following two cases:
[0150] 1. Under normal temperature heating conditions, the heating wire is loaded with a voltage of 13.5V (subject to the actual power supply voltage and power supply control strategy of the vehicle). After continuous heating for 30 minutes at an ambient temperature of 23℃, the temperature at any measuring point on the glass surface where the heating wire is located does not exceed 70℃, the hot spot temperature is 68℃, and the temperature at the temperature and humidity sensor installation location is 21℃, not exceeding 24℃ (the impact on the temperature and humidity sensor does not exceed 1℃), which meets the heating requirements. The stable power is 75W (heating film) and 20W (heating wire).
[0151] 2. Under low-temperature defrosting conditions, the heating wire is loaded with a voltage of 13.5V (subject to the actual power supply voltage and power supply control strategy of the vehicle), the ambient temperature is -18℃, and the frost layer thickness on the outer surface of the glass where the heating wire is located is 0.44mm (corresponding to a water spray volume of 4.4ml / dm2). After heating for 20 minutes, the frost layer coverage area ratio of all camera / laser vision FOV (field of view area) areas (FOV areas corresponding to the outer side of the glass) is 15%, not exceeding 20%; after heating for 30 minutes, the frost layer coverage area ratio of all camera / laser vision FOV areas (FOV areas corresponding to the outer side of the glass) is 0%, not exceeding 0%, and the stable power is 80W (heating film) and 25W (heating wire), which meets the defrosting requirements.
[0152] In addition, calibration tests were conducted, and the following experiments were performed using full-vehicle real-world testing:
[0153] First, defrosting performance test (idle speed).
[0154] 1. Prerequisites: Select a sample with a power lower limit of a-bW (lower limit of voltage and upper limit of resistance), and place the sample in an environment of -18℃. The sample is the vehicle defogging device described in the embodiment of this application.
[0155] Cool in the environment for 6 hours, then spray 4.5 ml / dm2 of water evenly on the outer surface of the glass in front of the optical sensing device, and let it stand for 25 minutes after completion;
[0156] 2. Test procedure: With no wind blowing on the glass, apply a voltage of 13.5V to the heating device (based on the actual power supply voltage and power supply control strategy of the whole vehicle), and record the defrosting visualization effect (image recording) and corresponding heating power for 0-5-10-15-20-25-30min.
[0157] 3. Acceptance criteria: After heating for 18 minutes, the proportion of frost-covered area in all camera / laser vision FOV areas (FOV areas corresponding to the outside of the glass) shall not exceed 20%; after heating for 28 minutes, the proportion of frost-covered area in all camera / laser vision FOV areas (FOV areas corresponding to the outside of the glass) shall not exceed 0.
[0158] Table 3
[0159]
[0160] Second, the experiment on the influence of temperature and humidity sensors (idle speed; if the straight-line distance between the temperature and humidity sensor and the edge of the vehicle's defrosting device is greater than 300mm, it is not involved).
[0161] Table 4
[0162]
[0163] 1. Prerequisites: Select a sample with the upper limit of power a+bW (upper limit of voltage and lower limit of resistance) and cool it in an environment of 15℃ for 2 hours;
[0164] 2. Experimental procedure: With no wind blowing on the glass, apply a voltage of 13.5V (based on the actual power supply voltage of the vehicle) to the heating device, and record the temperature rise curves at the installation location of the temperature and humidity sensor and at a location more than 300mm away from the edge of the heating device.
[0165] 3. Acceptance criteria: The temperature rise at the installation location of the temperature and humidity sensor and the temperature rise in areas more than 285mm away from the edge of the heating device should be ≤1℃.
[0166] If a certain range does not meet the requirements, multiple measurements are needed to meet the standard requirements while ensuring that the glass does not overheat. The test requirements for the full vehicle test are shown in Table 4.
[0167] Figure 5 A schematic diagram of the control device for the vehicle defrosting device provided in this application is shown below. Figure 5 As shown, the control device 50 of the vehicle defrosting device provided in this embodiment includes:
[0168] The acquisition module 501 is used to acquire the ambient temperature upon receiving a defogging command. The ambient temperature represents the temperature inside the vehicle.
[0169] The determining module 502 is used to determine the control duration based on the ambient temperature. The control duration includes the power-on duration and the power-off duration. The control duration is divided into a first control duration corresponding to the first heating element and a second control duration corresponding to the second heating element.
[0170] The control module 503 is used to control the heating of the first heating element according to the first control duration, and at the same time control the heating of the second heating element according to the second control duration, so as to defog the vehicle.
[0171] In one possible implementation, the defogging command assists the driving domain controller in acquiring temperature and humidity data and calculating the dew point temperature. When the ambient temperature is less than or equal to the dew point temperature, the command is generated and sent to the vehicle domain controller.
[0172] In one possible embodiment, the determining module 502 is further configured to determine a target temperature range including ambient temperature; determine the initial power-on duration, steady-state power-off duration, and steady-state power-on duration corresponding to the target temperature range, and calculate the control duration.
[0173] In one possible embodiment, the determining module 502 is further configured to calculate the sum of the steady-state power-off duration and the steady-state power-on duration to obtain the cycle duration; and to calculate the sum of the product of the cycle duration and the number of cycles and the initial power-on duration to obtain the control duration.
[0174] In one possible embodiment, the control module 503 is further configured to obtain a silence time after simultaneously controlling the second heating element to heat according to the second control duration; and to control the first heating element and the second heating element to be powered off and wait during the silence time.
[0175] The control device for the vehicle defogging device provided in this embodiment can execute the method provided in the above method embodiment. Its implementation principle and technical effect are similar, and will not be described in detail here.
[0176] Figure 6 This is a schematic diagram of the structure of the vehicle domain controller provided in this application. Figure 6 As shown, the vehicle domain controller 60 provided in this embodiment includes at least one processor 601 and a memory 602. Optionally, the device 60 further includes a communication component 603. The processor 601, memory 602, and communication component 603 are connected via a bus 604.
[0177] In a specific implementation, at least one processor 601 executes computer execution instructions stored in memory 602, causing at least one processor 601 to perform the above-described method.
[0178] The specific implementation process of processor 601 can be found in the above method embodiments, and its implementation principle and technical effect are similar. It will not be repeated here.
[0179] In the above embodiments, it should be understood that the processor can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), etc. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the method disclosed in this invention can be directly implemented by a hardware processor, or implemented by a combination of hardware and software modules within the processor.
[0180] The memory may include random access memory (RAM) and may also include non-volatile memory (NVM), such as at least one disk storage device.
[0181] The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. Buses can be categorized as address buses, data buses, control buses, etc. For ease of illustration, the buses shown in the accompanying drawings are not limited to a single bus or a single type of bus.
[0182] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the above-described method.
[0183] This application also provides a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, implement the above-described method.
[0184] The aforementioned readable storage medium can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk. The readable storage medium can be any available medium accessible to a general-purpose or special-purpose computer.
[0185] An exemplary readable storage medium is coupled to a processor, enabling the processor to read information from and write information to the readable storage medium. Of course, the readable storage medium can also be a component of the processor. The processor and the readable storage medium can reside in an Application Specific Integrated Circuit (ASIC). Alternatively, the processor and the readable storage medium can exist as discrete components in the device.
[0186] The division of units is merely a logical functional division; in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be indirect coupling or communication connection through some interfaces, devices, or units, and may be electrical, mechanical, or other forms.
[0187] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.
[0188] In addition, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.
[0189] If a function is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this invention, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.
[0190] Those skilled in the art will understand that all or part of the steps of the above-described method embodiments can be implemented by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When executed, the program performs the steps of the above-described method embodiments; and the aforementioned storage medium includes various media capable of storing program code, such as ROM, RAM, magnetic disks, or optical disks.
[0191] Finally, it should be noted that other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope.
Claims
1. A vehicle defrosting device, characterized in that, include: A vision sensor is installed on the inside of the windshield in front of the vehicle's cockpit to acquire image information; The first heating element is disposed on the inner surface of the windshield and avoids the field of view of the vision sensor, and is used to defog the field of view of the vision sensor when heated. The second heating element is evenly disposed on the inner surface of the cover, which is disposed on the inside of the windshield and the inner surface is concave. The inner surface of the cover does not adhere to the inner surface of the windshield. The concave surface covers the vision sensor and the first heating element, and works together with the first heating element to defog the field of view area. The vehicle body domain controller is electrically connected to the first heating element and the second heating element, and is used to control the first heating element and the second heating element to perform heating.
2. The apparatus according to claim 1, characterized in that, The first heating element is a heating wire, which is bent at equal intervals within the coverage area of the cover, and the second heating element is a heating film.
3. The apparatus according to claim 1, characterized in that, The vehicle defogging device also includes: The driver assistance domain controller is communicatively connected to the vehicle body domain controller and is used to send a defogging command to the vehicle body domain controller, so that the vehicle body domain controller controls the first heating element and the second heating element to perform heating.
4. The apparatus according to claim 1, characterized in that, The vehicle defogging device also includes: A power supply, electrically connected to the first heating element and the second heating element, is used to supply power to the first heating element and the second heating element; A relay, electrically connected to the power source, is used to control the power circuit to turn on or off.
5. A control method for a vehicle defrosting device, characterized in that, The vehicle defrosting device according to any one of claims 1 to 4 comprises: Upon receiving a defogging command, the ambient temperature is acquired, whereby the ambient temperature represents the temperature inside the vehicle. The control duration is determined based on the ambient temperature. The control duration includes the power-on duration and the power-off duration. The control duration is divided into a first control duration corresponding to the first heating element and a second control duration corresponding to the second heating element. The first heating element is controlled to heat according to the first control duration, and the second heating element is controlled to heat according to the second control duration, so as to defog the vehicle.
6. The method according to claim 5, characterized in that, The defogging command is generated and sent to the vehicle domain controller when the ambient temperature is less than or equal to the dew point temperature, after the driver domain controller acquires temperature and humidity data and calculates the dew point temperature.
7. The method according to claim 5, characterized in that, The control duration is determined based on the ambient temperature, including: Determine the target temperature range that includes the ambient temperature; Determine the initial power-on duration, steady-state power-off duration, and steady-state power-on duration corresponding to the target temperature range, and calculate the control duration.
8. The method according to claim 7, characterized in that, Calculating the control duration includes: The period duration is obtained by summing the steady-state power-off duration and the steady-state power-on duration. The control duration is obtained by summing the product of the cycle duration and the number of cycles with the initial energization duration.
9. The method according to claim 5, characterized in that, After simultaneously controlling the second heating element to heat according to the second control duration, the method further includes: Gain silence time; The first heating element and the second heating element are powered off and wait during the silence period.
10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer-executable instructions, which, when executed by a processor, are used to implement the method as described in any one of claims 5-9.