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Method and device for detecting obstacle

A technology of obstacle and detection area, applied in the field of obstacle detection, can solve the problems of low detection performance of the parking system, inability to accurately detect the distance of obstacles, and the inability of the parking system to accurately detect the distance of obstacles, etc., to achieve reduction Effects on traffic accidents, improvement of detection performance, and protection of life safety

Active Publication Date: 2019-12-27
SAIC MOTOR
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Problems solved by technology

[0005] In the blind area, due to the aftershock phenomenon of the ultrasonic sensor in the parking system, the parking system cannot accurately detect the distance of obstacles, especially the distance of obstacles in the blind area, which leads to the detection of the parking system. low performance

Method used

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  • Method and device for detecting obstacle

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Embodiment Construction

[0063] With the continuous improvement of the demand for vehicle intelligence, the vehicle is equipped with a parking system as standard, which is used to guide the vehicle to the parking position and realize the parking operation. The parking system uses ultrasonic sensors to calculate the distance between the vehicle and obstacles. However, since the ultrasonic wave is a mechanical wave, the mechanical vibration of the ultrasonic sensor cannot be dissipated quickly after the ultrasonic sensor emits the ultrasonic wave, and there is still an after-vibration phenomenon. And if the ultrasonic wave emitted by the ultrasonic sensor encounters an obstacle and reflects the echo before the aftershock is over, that is, when the obstacle is close to the ultrasonic sensor, then, due to the influence of the aftershock, the ultrasonic sensor will Echoes reflected by normal obstacles cannot be distinguished. For example, when detecting obstacles at close range, the emission time of the u...

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Abstract

The invention discloses a method and a device for detecting an obstacle. The method comprises the following steps: monitoring an aftershock time, comparing the aftershock time with a preset time threshold value, determining whether the obstacle exists in a short distance or not, sequentially transmitting two ultrasonic waves with opposite vibration directions, judging whether an echo signal is received or not, accurately calculating a distance between the obstacle and an ultrasonic sensor according to the echo signal if the echo signal is received, and determining that the obstacle is very close to the ultrasonic sensor and is located in a very small detection blind area if not. The obstacle in the area close to the ultrasonic sensor can be accurately detected, so it is ensured that a parking system can accurately detect the obstacle close to a vehicle, thereby intelligent parking is achieved, and the method and the device are of great significance to reducing traffic accidents and protecting life safety.

Description

technical field [0001] The invention relates to the technical field of vehicles, in particular to a method and device for detecting obstacles. Background technique [0002] The parking system is an important part of automatic parking and unmanned driving functions. With the increasing demand of users, the parking system has gradually become the standard configuration of vehicles. The precision and intelligence of the parking system affect the performance of other advanced functions of the vehicle, which in turn affects the user experience. [0003] At present, the parking system calculates the distance between the vehicle and the obstacle with the help of the ultrasonic sensor, that is, the ultrasonic wave emitted by the ultrasonic sensor vibrates and reflects the echo to the ultrasonic sensor after encountering an obstacle. By calculating the time difference between the ultrasonic emission and reception, multiply Divide the speed of sound by 2 to obtain the distance from t...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G08G1/16G01S15/04
CPCG01S15/04G08G1/168
Inventor 苏松恺
Owner SAIC MOTOR
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