Device and method for detecting automobile brake time sequence based on stereoscopic vision

Abstract

The invention relates to a device and a method for detecting an automobile brake time sequence based on stereoscopic vision, and belongs to automobile safety performance detecting equipment. The device comprises four same-type cameras, two same-specification gantry supports, an industrial control computer and the like. The device is characterized in that automobile body images of the left side and the right side of an automobile are collected by utilizing two groups of cameras, labeled contour line extraction and three-dimensional coordinate reconstruction are carried out by adopting a computer image processing technology, a motion track of labelling in an automobile brake process is established, the rotating speed of each wheel can be obtained in real time, a brake time sequence of each wheel is obtained, and the automobile brake performance is evaluated. According to the device disclosed by the invention, a brake locking time sequence of each wheel can be obtained during the automobile brake process. The method disclosed by the invention has the advantages that the design concept is novel and unique, the detection accuracy is good, the device structure is simple, and the installation and operation are convenient; a research result has certain theoretical value and certain practical value, and a very good application and promotion prospect is obtained.

Description

technical field [0001] The device of the invention belongs to detection equipment for automobile braking performance, in particular to a detection device and method for automobile braking timing based on stereo vision. Use 4 cameras to collect the images of the left and right sides of the car, use computer image processing technology to extract the labeling contour line and reconstruct the three-dimensional coordinates, calculate the angular velocity of the labeling during the braking process of the car, and obtain the speed of each wheel in real time, and obtain each wheel Braking sequence, to evaluate the braking performance of the car. The device has the characteristics of high detection precision and good system reliability, fast detection speed, strong repeatability, simple structure and reasonable design, and reduces the manufacturing cost of the detection device. Background technique [0002] During the braking process of a car, the braking timing of each wheel is ve...

AI Technical Summary

Problems solved by technology

If the front wheels are locked or the front wheels are locked and slipped first, the car will lose its steering ability, and the rear wheels will be locked first, and the car will easily slip. Fast braking, easy to generate drag at the moment of braking

In 2011, the national standard GB / T22768-2011 "Automobile Train Performance Requirements and Test Methods" stipulated the inspection requirements for the braking lag time: the time difference between the braking action of the last axle of the trailer and the front axle of the tractor should not be greater than 0.2s. Requirements are made for the time difference of the braking action of other axes, and the detection method is also relatively cumbersome

[0003] In 1991, Jiangsu Institute of Technology trial-manufactured a vehicle braking timing instrument. This equipment used infrared photoelectric sensors to project and scan a disc engraved with 36 fan-shaped grooves. The equipment was mounted on each wheel. When the wheel rotated, The rotating shaft drives the disc to rotate, and the disc cuts the infrared light to generate a pulse signal output. By drawing the pulse signal diagram of each wheel, the braking sequence is obtained, but the installation of the device is cumbersome and the detection accuracy is low, so it is difficult to meet the current efficient and fast detection requirements.

[0004] At present, there is no efficient device for automobile braking timing detection

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