Rear vehicle warning system and warning method based on ultrasonic ranging

Abstract

The invention relates to a rear vehicle warning system and a warning method based on ultrasonic ranging. Comprises a control circuit and an ultrasonic generating circuit, an ultrasonic receiving circuit, an ultrasonic power supply control circuit, a danger distance warning module, a step-down power supply module and a display module connected with the control circuit; An ultrasonic generate circuit emits ultrasonic wave and starts timing; When the ultrasonic wave receiving circuit receives the returned ultrasonic wave, the timing is finished and the data of a node is generated, and then the relative distance between the vehicle and the rear vehicle is calculated. The relative instantaneous speed and acceleration can be calculated according to the obtained data of multiple time nodes, and the instantaneous speed of the vehicle, the instantaneous acceleration of the vehicle, the instantaneous speed of the rear vehicle and the instantaneous acceleration of the rear vehicle can be calculated according to the instantaneous speed of the vehicle, So as to judge whether the distance between the vehicle and the rear vehicle is safe or not. The invention can prompt the rear car to maintain asafe distance with the vehicle when the vehicle is running at high speed, so as to reduce the rear-end collision accident caused by the small distance between the rear car and the vehicle.

Description

technical field [0001] The invention relates to the field of automobiles, in particular to a rear vehicle warning system and warning method based on ultrasonic distance measurement. Background technique [0002] The automatic braking system refers to the anti-collision braking system made by infrared, ultrasonic or thermal sensing ranging systems. This system can use the measured distance between the vehicle and the object in front and the speed of the vehicle to calculate if Start to brake, the distance to the object after braking, to judge whether automatic braking is needed, but the disadvantage of this device is that even if you successfully brake to ensure the safety of the object in front, it cannot guarantee the safety of the vehicle and the rear vehicle There will be a safe braking distance. Sometimes the vehicle with the automatic braking system brakes successfully, but it may still encounter the situation of being rear-ended by the rear car, which will still cause ...

AI Technical Summary

Problems solved by technology

However, when this technology is applied to the warning of the rear car, it is impossible to control the safe vehicle distance by controlling the speed of the vehicle.

Images