Anti-collision ultrasonic sensor for low-speed driving of automobile

Abstract

The invention relates to the technical field of vehicle sensors, in particular to an automobile low-speed driving anti-collision ultrasonic sensor which comprises an aluminum shell with an opening at one end; a piezoelectric wafer which is fixedly arranged at one end, far away from the opening, in the aluminum shell and is tightly attached to the inner wall of the aluminum shell, wherein electric energy and sound energy are mutually converted by the piezoelectric wafer; a control panel which is arranged in the aluminum shell, wherein a gap is formed between the control panel and the piezoelectric wafer, the control panel is electrically connected with the piezoelectric wafer, filler is arranged between the control panel and the piezoelectric wafer, and the filler absorbs sound signals; and a damping material which is loaded in the aluminum shell, wherein the wall thickness of the end, provided with the piezoelectric wafer, of the aluminum shell is 0.2 mm to 0.4 mm. According to the invention, electric energy and sound energy are mutually converted through the piezoelectric wafer, ultrasonic waves are emitted for detection, and the wall thickness of the end, provided with the piezoelectric wafer, of the aluminum shell is 0.2 mm to 0.4 mm, so that the loss of the sound energy is reduced, the vibration frequency of the sound energy is better matched with the vibration frequency of the ultrasonic waves, the detection distance is farther, and collision prevention is better carried out.

Description

Technical field [0001] The present invention relates to the technical field of vehicle sensors, and more particularly to a car low-speed travel anti-collision ultrasonic sensor. Background technique [0002] With the development of the automotive industry, automotive driving systems tend to mature, need to use a variety of different types of sensors, such as GPS, laser radar, antenna radar, reversing radar, auxiliary parking radar. GPS can locate navigation detection road conditions, laser radar can detect a few hundred meters of road conditions, the antenna radar can do a high-speed anti-collision of dozens of meters to one hundred meters, reversing radar as a reversing anti-collision, auxiliary parking radar detection parking space car. [0003] However, when the car is driving at low speed, when there is a vehicle or an obstacle to block the line of sight, from the roadside suddenly pull out a non-motorized train or pedestrian, the driver often avoids, because the incident sud...

AI Technical Summary

Problems solved by technology

[0003] But when the car is running at low speed, when there is a vehicle or obstacle blocking the line of sight in front, a non-motor vehicle or pedestrian suddenly jumps out from the side of the road, the driver often cannot avoid it, because the incident happens suddenly, and there is no time and time for each other to react and avoid. Space, people are caught off guard, resulting in safety accidents

However, the existing ultrasonic sensors for vehicles can only detect a distance of about 6m, so a sensor that can detect a longer distance is urgently needed to detect people or objects that appear suddenly, and avoid collisions through automatic braking

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