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A method and device for automatically removing rain, snow and frost from automobile rearview mirrors based on Lamb waves

A car rearview mirror, rain and snow technology, applied in vehicle maintenance, vehicle cleaning, transportation and packaging, etc., can solve the problems of consuming a lot of car battery power, affecting the observation effect of the rearview mirror, and increasing the complexity of driving, etc., to achieve Piezoelectric ceramic transducer patch is small in size, eliminates potential safety hazards, and has the effect of compact structure

Active Publication Date: 2018-10-16
SHANGHAI UNIV OF ENG SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] One is that the existing technologies all use ultrasonic waves to vaporize the raindrops on the rearview mirror to make them become mist and leave the mirror surface. Not only does the ultrasonic energy required is relatively high, it also needs to consume a lot of car battery power, and when the car is driving downwind, the mist is easy to regenerate. Solidified on the mirror surface, which will cause the mirror surface to be fogged, which will affect the observation effect of the rearview mirror;
[0010] The second is that the existing technology is equipped with a rain sensor on the rearview mirror, or manually starts the rain removal through manual control. The former will make the structure of the whole device more complicated and the reliability will be reduced, and the latter will further increase the complexity of driving.

Method used

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  • A method and device for automatically removing rain, snow and frost from automobile rearview mirrors based on Lamb waves
  • A method and device for automatically removing rain, snow and frost from automobile rearview mirrors based on Lamb waves
  • A method and device for automatically removing rain, snow and frost from automobile rearview mirrors based on Lamb waves

Examples

Experimental program
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Effect test

Embodiment 1

[0049] Such as figure 1 As shown, the upper piezoelectric ceramic transducer patch 101 and the lower piezoelectric ceramic transducer patch 201 are respectively glued on the upper and lower sides of the mirror surface (exposed surface) of the rear view lens 3, the driving circuit and the receiving feedback circuit They are respectively fixed inside the rearview mirror housing 6 and respectively connected to the upper piezoelectric ceramic transducer patch 101 and the lower piezoelectric ceramic transducer patch 201 through wires.

[0050] The entire device is powered by the body battery, and the metal-oxide semiconductor field effect transistor (MOSFET) integrates the 12V-18V DC voltage provided by the battery with the signals of various waveforms (including sine wave, square wave, triangle wave, etc.) of the signal generator , Output the AC signal of about 980kHz~1023kHz, 20Vpp~80Vpp with the same waveform as the signal generator. The AC signal is applied to the upper piezoelectr...

Embodiment 2

[0054] The upper piezoelectric ceramic transducer patch 101 and the lower piezoelectric ceramic transducer patch 201 are respectively glued on the upper and lower sides of the front (exposed surface) of the rear view lens 3, and the driving circuit device and the receiving feedback circuit are respectively fixed on The rearview mirror housing 6 is connected to the upper piezoelectric ceramic transducer patch 101 and the lower piezoelectric ceramic transducer patch 201 through wires, respectively.

[0055] The whole device is powered by the body battery. After the car is parked for a long time, the cold weather in the north will likely cause a layer of snow, ice or frost on the surface of the rearview lens 3. The owner can manually start the car when warming up the car. Device, or when the car is warming up, the device can be automatically activated through linkage control. The metal-oxide semiconductor field effect transistor (MOSFET) integrates the 12V~18V voltage provided by th...

Embodiment 3

[0057] Such as Image 6 As shown, the upper piezoelectric ceramic transducer patch 101 and the lower piezoelectric ceramic transducer patch 201 are respectively glued on the upper and lower sides of the back of the rear view lens 3, and the driving circuit and the receiving feedback circuit are respectively fixed on the rear view mirror The housing 6 is connected to the upper piezoelectric ceramic transducer patch 101 and the lower piezoelectric ceramic transducer patch 201 through wires.

[0058] The entire device is powered by the body battery, and the metal-oxide semiconductor field effect transistor (MOSFET) integrates the 12-18V DC voltage provided by the battery with the signals of various waveforms (including sine wave, square wave, triangle wave, etc.) from the signal generator , Output the AC signal of about 980kHz~1023kHz, 20Vpp~80Vpp with the same waveform as the signal generator. The AC signal is applied to the upper piezoelectric ceramic transducer patch 101 to cause ...

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Abstract

A method and device for automatically removing rain, snow and frost for automobile rearview mirrors based on Lamb wave are provided, detecting Lamb waves are transmitted from top to bottom along a surface of a rearview mirror, and Lamb waves for removing rain, snow and frost push rain drops to leave the surface of the rearview mirror when wave amplitude changes; alternatively, Lamb waves for removing rain, snow and frost that propagate from top to bottom are provided on the surface of the rearview mirror, a piezoelectric ceramic transducer patch produces heat so that snow, ice or frost at an interface of the surface of the rearview mirror with accumulated snow, ice or built frost is thawed into liquid water, and the snow, ice or frost is pushed to leave the surface of the rearview mirror. According to the method and device, the Lamb wave for removing rain, snow and frost is used to push rain drops, accumulated snow, formed ice or built frost to leave the surface of the rearview mirror, the mirror surface never fogs whether in downwind or headwind direction, and the potential safety danger caused by the blurring rearview mirror on rainy days or in winter is fundamentally eliminated.

Description

Technical field [0001] The invention relates to a method and a device for automatically removing rain, snow and frost from a rearview mirror of an automobile, in particular to a Lamb ultrasonic wave. Background technique [0002] Car rearview mirror is an important component in car safety configuration. It provides an important auxiliary basis for the driver to judge the rear vehicle condition and road condition. It is very important to keep the rearview mirror clean and clear. However, in rainy or foggy weather, it is easy to hang many water droplets on the rearview mirror, and the mirror surface becomes very blurry. The driver can only roughly see the condition of the car behind, which affects the driver’s judgment of the distance between vehicles and brings about overtaking and merging. Quite troublesome, there are serious traffic safety hazards. Or in the cold winter in the north, snow, ice or frost may accumulate on the rearview mirror. At the current stage, only manual dei...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60S1/60B60S1/02
CPCB60S1/026B60S1/60
Inventor 梁威张梦华洪少欣
Owner SHANGHAI UNIV OF ENG SCI