Door-opening warning system of car

Abstract

The invention provides a door-opening warning system of a car. The method comprises a car-mounted millimeter-wave radar and a control module. The car-mounted millimeter-wave radar is configured to emit a millimeter-wave signal around the car and receive and process the millimeter-wave signal reflected by an object around the car such that the distance between a moving object around the car and thecar is detected and the speed at which the moving object approaches the car is also detected. The control module is configured to response to the detection that a car door is about to open, determinewhether the object is to reach the car door or not according to the distance between the moving object and the car and the speed at which the moving object approaches the car, and response to the detection that the moving object is about to reach the car door and output warning information.

Description

technical field [0001] The invention relates to the field of vehicles, in particular to a vehicle door opening alarm system. Background technique [0002] When the vehicle door is opened, sometimes there will be fast-moving objects such as motorcycles, battery cars, bicycles, etc., and a collision accident will occur because the rider does not see the door opening or has no time to react. Most of the existing solutions allow the people in the car to judge by themselves through the rearview mirror, or use ultrasonic radar to monitor the distance of the object and send out reminders to assist the people in the car to make judgments. [0003] For the scheme that allows the people in the car to judge by the rearview mirror, sometimes the people in the car forget to observe the rearview mirror when opening the door, resulting in a collision accident. [0004] However, the scheme of using ultrasonic radar to assist judgment has the following disadvantages: [0005] 1. Ultrasound...

AI Technical Summary

Problems solved by technology

[0005] 1. Ultrasound has poor directionality, large divergence angle, and low resolution. It is easy to use the car in the adjacent lane as the detection object, resulting in a wrong reminder

[0006] 2. The response speed of ultrasonic waves is not fast enough, and the propagation speed of ultrasonic waves is the speed of sound

If the target distance is measured for fast-moving objects such as battery cars and motorcycles, the lag is large, and the reminder may not be issued in time

[0007] 3. The attenuation of ultrasonic waves is relatively strong, so the test of long-distance objects will be relatively limited

For example, if you want to measure a fast-moving object, such as a battery car with a speed of 60km / h, you need to start detection at about 50m, while the detection distance of ordinary ultrasonic radar cannot reach this far, so timely detection and reminders cannot be performed

[0008] 4. Ultrasonic radar is difficult to detect the nature of the target object, and can only judge the distance of the object, so the detection accuracy and intelligence are not high

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