Vehicle rearview mirror water removal device and method based on piezoelectric ceramics

Abstract

The invention discloses a vehicle rearview mirror water removal device and method based on piezoelectric ceramics. The device integrates a piezoelectric ceramic driving technology and an air flow control technology. The device mainly comprises a piezoelectric ceramic assembly, an air guide pipeline and a control system. The control system can output an electric signal with specific frequency and intensity according to parameter setting; the piezoelectric ceramic component can generate mechanical vibration under the excitation of an electric signal output by the control system; air conditioning air of the automobile can be introduced into the rearview mirror through the ventilation pipeline, and the air conditioning air blows off water drops on the surface of the rearview mirror through the ventilation holes in the rearview mirror. The control system can automatically adjust the vibration frequency of the piezoelectric ceramic assembly and the air flow intensity of the air conditioner air according to the environment humidity and the rearview mirror water drop state, and therefore the rapid and efficient water removal effect is achieved. The technical scheme is used for solving the problem that in the prior art, when a vehicle runs on rainy days and in high-humidity areas, rearview mirrors are blurred.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle auxiliary equipment, and in particular to a vehicle rearview mirror water removal device and method based on piezoelectric ceramics, which aims to achieve efficient water removal from the surface of the vehicle rearview mirror through intelligent control. Background Art

[0002] When a car is driving, especially in rainy or humid weather conditions, water droplets tend to accumulate on the surface of the rearview mirror, which limits the driver's field of vision and increases driving safety hazards. In order to solve this problem, vehicle rearview mirror water removal technology came into being.

[0003] At present, the vehicle rearview mirror water removal technology is mainly divided into several categories. A common method is to use a heating water removal device. This device sets a heating element inside the rearview mirror. When water droplets accumulate on the surface of the rearview mirror, the heating element is activated to increase the mirror temperature, and the water droplets evaporate due to heat, thereby achieving the water removal effect. This method is particularly effective in light rain weather and can quickly dry the water droplets on the mirror surface. However, in heavy rain weather, the effect of heating water removal will be affected to a certain extent, and long-term high-temperature heating may damage the material of the rearview mirror and shorten its service life.

[0004] Another method is to use a mechanical water removal device, such as a high-speed rotating mirror. This device generates centrifugal force by rotating the mirror at high speed, which removes water droplets from the mirror, thereby achieving the water removal effect. Although this method works better in light rain and moderate rainfall, the high-speed rotating mirror may generate noise, affecting the driving experience. At the same time, the additional auxiliary mirror may have a certain impact on the appearance of the vehicle.

[0005] In addition to the above two methods, there are some other water removal technologies, such as using anti-fog rearview mirrors with special coatings and installing rain shields. These methods have their own advantages and disadvantages, but they all have certain limitations. For example, although anti-fog coatings can effectively prevent water droplets from condensing, their timeliness is limited and they need to be re-sprayed regularly; while rain shields work better in light rain, but have limited effect in heavy rain.

[0006] In recent years, with the continuous development of piezoelectric material technology, piezoelectric ceramics have gradually been used in various smart devices due to their unique piezoelectric effect. The inverse piezoelectric effect of piezoelectric ceramics means that when an electric field is applied to piezoelectric ceramics, the ions and electrons inside the ceramics will move under the action of the electric field, causing mechanical deformation of the ceramics. Using this effect, piezoelectric ceramics can be made into various sensors and actuators, which are widely used in ultrasonic transducers, vibrators and other fields.

[0007] In view of the unique properties of piezoelectric ceramics, the present invention proposes a vehicle rearview mirror water removal device and method based on piezoelectric ceramics. The device is cleverly designed to combine piezoelectric ceramics, air conditioning wind and rearview mirror structure, and uses the mechanical vibration generated by the piezoelectric effect and the airflow of the air conditioning wind to remove water droplets on the mirror surface. This method can not only improve the water removal efficiency, but also avoid the material damage problem that may be caused by traditional heating water removal methods. At the same time, piezoelectric ceramics have the advantages of simple structure, fast response speed, low energy consumption, etc., which makes the device have broad prospects in practical applications. Summary of the invention

[0008] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a vehicle rearview mirror water removal device and method based on piezoelectric ceramics to solve the problem that the existing vehicle rearview mirror is prone to water accumulation in rainy days or humid environments, resulting in limited driver vision and increased driving safety hazards. By integrating advanced piezoelectric ceramic materials and control technology, the present invention aims to achieve automatic, efficient and energy-saving water removal function on the surface of the rearview mirror.

[0009] To achieve the above object, the present invention provides the following technical solutions:

[0010] The vehicle rearview mirror water removal device of the present invention comprises a piezoelectric ceramic component, a ventilation duct, a rearview mirror housing, a rearview mirror glass and a control system, and the components work in coordination through electrical and mechanical connections.

[0011] Furthermore, the control system is responsible for receiving external parameter settings and outputting electrical signals of specific frequency and intensity according to a preset algorithm to control the vibration of the piezoelectric ceramic component and the intensity of the air entering the air conditioner. The control system includes a humidity sensor and a water droplet sensor. The humidity sensor is used to monitor the ambient humidity in real time; the water droplet sensor is used to monitor the state of water droplets on the surface of the rearview mirror. The water droplet sensor can identify the existence, size, distribution and other information of water droplets and feed it back to the control system; the control system automatically adjusts the excitation frequency and intensity of the piezoelectric ceramic component according to the feedback information provided by the humidity sensor and the water droplet sensor.

[0012] Furthermore, the piezoelectric ceramic element is installed inside the rearview mirror housing and fixed to the rearview mirror glass by ultrasonic glue. Under the stimulation of the electrical signal output by the control system, mechanical vibration is generated to drive the water droplets on the surface of the rearview mirror glass to fall off.

[0013] Furthermore, one end of the ventilation duct is connected to the air conditioning system in the car, and the other end is connected to the rearview mirror housing. An electromagnetic valve for controlling airflow is provided inside the ventilation duct, which is adjusted by the control system to change the intensity of the air conditioning wind entering the rearview mirror.

[0014] Furthermore, the piezoelectric ceramic assembly, ventilation duct, circuit board of the control system, humidity sensor and water drop sensor are fixed inside the rearview mirror housing by a bracket; the rearview mirror glass is fixed outside the rearview mirror housing, and ventilation holes are provided on the upper edge where the two are fixed, and the rearview mirror glass is connected to the piezoelectric ceramic assembly by ultrasonic glue.

[0015] The beneficial effects of the device of the present invention are:

[0016] The device achieves collaborative work among components through efficient integration of control systems, piezoelectric ceramic components, ventilation ducts, rearview mirror housings and rearview mirror glass. The close coordination of the components allows water droplets to fall off quickly under the dual effects of the vibration of the piezoelectric ceramics and the airflow of the air-conditioning wind.

[0017] The control method of the present invention comprises four steps:

[0018] In the first step, the control system receives external parameter settings, such as temperature, humidity, vehicle speed, etc., and calculates the optimal piezoelectric ceramic vibration frequency and intensity, as well as the operating mode of the air conditioning wind entering the rearview mirror housing according to a preset algorithm.

[0019] In the second step, the control system outputs an electrical signal of a specific frequency and intensity to the piezoelectric ceramic element, which stimulates it to produce mechanical vibration. The vibration is transmitted to the surface of the rearview mirror glass through the bracket, causing the water droplets to fall off due to the vibration.

[0020] In the third step, the control system controls the operation mode of the air conditioning wind entering the rearview mirror housing, such as wind speed, wind temperature, etc. The air conditioning wind flows through the ventilation holes inside the rearview mirror housing and blows toward the rearview mirror glass surface, further accelerating the removal of water droplets.

[0021] In the fourth step, the humidity sensor and water droplet sensor provide feedback to the control system based on the water droplet adhesion on the rearview mirror glass surface and the ambient humidity. The control system can adjust the vibration frequency and intensity of the piezoelectric ceramics and the air conditioning operation mode in real time to ensure the best water removal effect.

[0022] The beneficial effects of the method of the present invention are:

[0023] This intelligent control method can adjust the water removal strategy according to the real-time situation to ensure the maximum water removal effect. Through the dual effects of the vibration of the piezoelectric ceramic and the airflow of the air conditioner, water droplets are quickly and effectively removed, thereby improving the clarity of driving vision and enhancing driving safety.

[0024] This method can adjust the vibration frequency and intensity of the piezoelectric ceramics and the operation mode of the air conditioner in real time according to the water droplet adhesion on the rearview mirror glass surface. This real-time response feature enables the device to quickly adapt to different climate conditions and water droplet adhesion states, ensuring the best water removal effect in different environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A partial side cross-sectional view of an embodiment of the present invention;

[0026] Figure 2 It is a positive triaxial isometric drawing of an embodiment of the present invention;

[0027] Figure 3 It is a right side view of an embodiment of the present invention;

[0028] Figure 4 It is a right side cross-sectional view of an embodiment of the present invention;

[0029] Figure 5 It is a schematic diagram of the principle flow of an embodiment of the present invention;

[0030] Figure 6 Schematic diagram of four working modes of an embodiment of the present invention;

[0031] Figure 7 A schematic diagram of a defog function flow chart of an embodiment of the present invention;

[0032] Figure 8 FIG. 4 is a schematic diagram of a water droplet removal function according to an embodiment of the present invention.

[0033] In the figure: 1 rearview mirror housing, 2 rearview mirror glass, 3 piezoelectric ceramics, 4 control system circuit board, 5 ventilation duct. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] See also Figure 1-4 In this embodiment, a vehicle rearview mirror water removal device based on piezoelectric ceramics includes a rearview mirror housing 1, in which a rearview mirror glass 2, piezoelectric ceramics 3, a control system circuit board 4 and a ventilation duct 5 are fixed.

[0036] In this embodiment, a ventilation hole is provided at the connection between the top end of the outer peripheral wall of the rearview mirror housing 1 and the rearview mirror glass 2 .

[0037] Specifically, the air conditioning wind blows the water droplets on the rearview mirror glass 2 downward from the ventilation holes.

[0038] In this embodiment, the piezoelectric ceramic 3 is connected to the back surface of the rearview mirror glass 2 by ultrasonic glue.

[0039] Specifically, the ultrasonic glue transmits the mechanical vibration of the piezoelectric ceramic 3 to the rearview mirror glass 2 , thereby vibrating off water drops on the rearview mirror glass 2 .

[0040] In this embodiment, one end of the ventilation duct 5 is connected to the air conditioner in the vehicle, and the other end is connected to the ventilation hole of the rearview mirror. A plurality of electromagnetic control valves are arranged inside the ventilation duct 5, and the electromagnetic control valves are connected to the control system circuit board 4 through signal lines.

[0041] Specifically, the electromagnetic control valve is controlled by the control system circuit board 4 to adjust the ventilation volume of the ventilation duct 5 in real time. The air-conditioned wind is transmitted to the ventilation holes of the rearview mirror housing 1 through the ventilation duct 5 to blow away the water droplets on the rearview mirror glass 2.

[0042] In this embodiment, the control system circuit board 4 is connected to the humidity sensor and the water drop sensor through a signal line, the temperature sensor is fixed inside the rearview mirror housing 1, and the water drop sensor is fixed on the edge of the rearview mirror glass 2.

[0043] Specifically, the humidity sensor can detect the ambient humidity in real time, and the water drop sensor can detect the state of water droplets on the surface of the rearview mirror glass in real time. The humidity sensor and the water drop sensor feed back data to the control system circuit board 4 in real time. The control system responds after receiving the data fed back by the sensor. When it is detected that the ambient humidity is high, the ventilation duct valve is opened to allow the air-conditioning wind to be transmitted to the rearview mirror glass surface 2 to keep the rearview mirror glass 2 dry. When water droplets are detected on the rearview mirror glass 2, the piezoelectric ceramic 3 is started to vibrate and the ventilation duct 5 valve is opened at the same time to accelerate the falling and evaporation of water droplets.

[0044] In this embodiment, a method for removing water from a vehicle rearview mirror based on piezoelectric ceramics is provided. Figure 5 As shown, the method includes:

[0045] S1, the driver turns on the automatic water removal function of the rearview mirror in the control center in the car;

[0046] S2, the driver inputs initial parameters and selects different working modes;

[0047] S3, piezoelectric ceramic vibration to remove water, air conditioning wind blows off water droplets;

[0048] S4, under the regulation of the control system, the humidity sensor and the water drop sensor monitor in real time;

[0049] S5, adjusting the water removal mode according to the feedback data detected by the sensor;

[0050] S6, water removal is completed, the rearview mirror is clean, and the water removal function is automatically turned off.

[0051] Furthermore, when the driver selects the dehydration system working mode in the car and turns on the automatic dehydration function of the rearview mirror, the piezoelectric ceramics generate mechanical vibrations accordingly, and the air-conditioning wind blows out through the ventilation holes of the rearview mirror housing. After the control system receives feedback data from the humidity sensor and the water droplet sensor, it automatically makes appropriate adjustments to the dehydration mode. When it detects that the rearview mirror glass is clean, the system automatically stops working. It should be specifically noted that the air-conditioning wind temperature is controllable and will change with the change of the dehydration mode.

[0052] In this embodiment, the system includes 4 working modes, such as Figure 6 As shown, it specifically includes a demisting mode S21, a water drop removal mode S22 and a deicing mode S23.

[0053] Furthermore, different working modes require different vibration frequencies and intensities of piezoelectric ceramics, as well as different wind speeds and temperatures of the air-conditioning wind. Specifically, the defog mode only turns on the air-conditioning wind, using it to accelerate air flow and accelerate the evaporation of water mist on the rearview mirror glass; the water droplet removal mode turns on the vibration of the piezoelectric ceramics and the air-conditioning wind at the same time; the deicing mode uses the heating characteristics of the piezoelectric ceramics to melt the ice on the rearview mirror glass, while increasing the temperature of the air-conditioning wind to melt the ice into water droplets, and the system then automatically adjusts to the water droplet removal mode.

[0054] In this embodiment, the defogging mode only uses the air conditioning function, such as Figure 7 shown.

[0055] Furthermore, after the control system turns on the rearview mirror defogger function, it will automatically open the valves of the air conditioner and ventilation duct used in the rearview mirror system. The air-conditioned air is transmitted to the ventilation holes of the rearview mirror housing through the ventilation duct and blows toward the rearview mirror glass surface. At the same time, under the feedback adjustment of the humidity sensor, the wind speed and temperature of the air-conditioned air are automatically adjusted to achieve the best defogger effect.

[0056] In this embodiment, the water drop removal mode uses both the piezoelectric ceramic vibration function and the air conditioning function. Figure 8 shown.

[0057] Furthermore, the control system turns on the piezoelectric ceramic vibration and air conditioning wind at the same time, directly or indirectly acting on the water droplets on the surface of the rearview mirror glass. At the same time, under the feedback adjustment of the water droplet sensor and the humidity sensor, the vibration frequency and intensity of the piezoelectric ceramic, as well as the wind speed and temperature of the air conditioning wind are adjusted in real time. Under the dual action of the two, the system achieves the best water droplet removal effect.

[0058] The working principle of the above embodiment is:

[0059] (1) When the vehicle is driving in the rain or in a high-humidity environment, the humidity sensor will monitor the ambient humidity in real time and feed the data back to the control system. At the same time, the water droplet sensor will also monitor the state of water droplets on the surface of the rearview mirror in real time, including the number, size and distribution of water droplets.

[0060] (2) The control system intelligently selects the best excitation signal mode based on the feedback information provided by the humidity sensor and the water droplet sensor. These excitation signals include electrical signals of different frequencies and intensities, which are used to excite the piezoelectric ceramic components to generate mechanical vibrations. At the same time, the control system also adjusts the airflow intensity of the ventilation duct according to the real-time humidity and water droplet status to ensure that the air conditioning wind can be blown evenly onto the surface of the rearview mirror glass.

[0061] (3) Under the combined effect of the mechanical vibration of the piezoelectric ceramic component and the air conditioning wind, the water droplets on the surface of the rearview mirror will be quickly broken and evaporated.

[0062] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", etc. is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present application can be understood according to the specific circumstances. The equipment includes not only those elements, but also other elements that are not explicitly listed, or also includes elements inherent to such a process, method, article or equipment. In the absence of further restrictions, the elements defined by the sentence "including a..." do not exclude the existence of other identical elements in the process, method, article or equipment including the elements.

[0063] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A vehicle rearview mirror water removal device based on piezoelectric ceramics, the device comprising: A piezoelectric ceramic component, a ventilation duct and a control system, wherein the piezoelectric ceramic component is connected to a vehicle rearview mirror via ultrasonic glue and is connected to the control system via a signal line; the air guide duct is connected to the vehicle air-conditioning system at one end and to the vehicle rearview mirror at the other end, and air-conditioning wind is introduced into the rearview mirror via the ventilation holes in the rearview mirror, wherein the ventilation holes are located at the junction of the rearview mirror and the upper edge of the outer shell, and the air-conditioning wind blows water droplets off the surface of the rearview mirror through the ventilation holes; the control system is connected to the piezoelectric ceramic component, the humidity sensor and the water drop sensor via signal lines.

2. The vehicle rearview mirror water removal device according to claim 1, wherein: The control system includes a humidity sensor and a water drop sensor. The humidity sensor is used to monitor the ambient humidity in real time. The water drop sensor is used to monitor the state of water droplets on the surface of the rearview mirror. The water drop sensor can identify the existence, size, distribution and other information of water droplets and feed it back to the control system. The control system automatically adjusts the excitation frequency and intensity of the piezoelectric ceramic component according to the feedback information provided by the humidity sensor and the water drop sensor.

3. The vehicle rearview mirror water removal device according to claim 1, wherein: The piezoelectric ceramic component includes at least one piezoelectric ceramic cylinder, which can undergo slight deformation under the stimulation of the electrical signal, thereby generating high-frequency mechanical vibrations, which are used to break the adhesion of water droplets on the surface of the rearview mirror and promote their shedding.

4. The vehicle rearview mirror water removal device according to claim 1, wherein: The air guide duct is provided with a plurality of regulating valves, so that the air flow intensity of the air-conditioning wind entering the rearview mirror can be accurately adjusted.

5. The vehicle rearview mirror water removal device according to claim 1, wherein: The excitation signal of the piezoelectric ceramic component includes electrical signals of different frequencies and intensities. The control system can intelligently select the best excitation signal mode according to the detected water drop condition of the rearview mirror and the ambient humidity, thereby optimizing the water drop removal effect.

6. The vehicle rearview mirror water removal device according to claim 1, wherein: The air-conditioning wind enters the rearview mirror through the air guide duct and forms a uniform airflow through a plurality of air holes arranged in the rearview mirror. The airflow can effectively cover the surface of the rearview mirror.

7. The vehicle rearview mirror water removal device according to claim 1, wherein: The piezoelectric ceramic component is connected to a control system, and data transmission is achieved with a central control system of the vehicle via a wireless communication module. The central control system can remotely adjust the working mode of the piezoelectric ceramic component.

8. A method for removing water from a vehicle rearview mirror based on piezoelectric ceramics, the method comprising: Step 1: Monitor the ambient humidity in real time through the humidity sensor; Step 2: Detect the state of water droplets on the surface of the rearview mirror through a water drop sensor, including the number, size and distribution of water droplets; Step 3: According to the humidity and water drop state information obtained in step 1 and step 2, the control system outputs an electrical signal of a specific frequency and intensity to stimulate the piezoelectric ceramic component to generate mechanical vibration; Step 4: Introduce air conditioning wind into the rearview mirror through the air duct, and the air conditioning wind blows off the water droplets through the ventilation holes in the rearview mirror; Step 5: The control system automatically adjusts the vibration frequency of the piezoelectric ceramic component and the airflow intensity of the air conditioning wind according to the real-time humidity data and water droplet status.

9. The method for removing water from a vehicle rearview mirror according to claim 8, wherein: The control system can select the optimal excitation signal frequency and intensity of the piezoelectric ceramic component and the air flow intensity of the air conditioning wind according to the humidity and water drop state detected in real time.

10. The method for removing water from a vehicle rearview mirror according to claim 8, wherein: The vibration frequency of the piezoelectric ceramic component and the air flow intensity of the air conditioning wind are automatically adjusted according to the actual conditions in different environments.

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