Method and device for detecting backing distance

Abstract

The invention relates to a method and a device for detecting backing distance. The device comprises a microprocessor, a plurality of transmission driving circuits electrically connected with the microprocessor, and a plurality of ultrasonic probes correspondingly connected with the transmission driving circuits, wherein an audio alarm unit, a display unit, a signal comparer and an electronic switch are also electrically connected to the microprocessor, a frequency-selecting amplifier, an amplifier and a signal detector are sequentially and electrically connected between the electronic switch and the signal comparer, and the electronic switch is electrically connected between each transmission driving circuit and the ultrasonic probe corresponding to the transmission driving circuit through a conducting wire. The device scans, transmits and receives ultrasonic waves reflected by a barrier in a multi-channel scanning mode and temporarily stores the ultrasonic waves, and then calculates the vertical distance between the barrier and a vehicle body according to the triangle principle after accomplishing one-step circulation so as to give an alarm and distance display. The method and the device improve measuring accuracy and provide accurate stopping and parking operation prompts for drivers.

Description

technical field [0001] The invention relates to a backing and parking assist device, in particular to a method and device for detecting obstacle distances during the backing and parking process. Background technique [0002] "Parking" is a problem that every driver must face. Sometimes the planning of the parking space is relatively narrow. In this case, the driver must have rich experience and skilled skills to smoothly put the car into the parking space. When the driver's technology is not so skilled, it is difficult to avoid unexpected collisions and collisions. In order to help drivers solve the difficulties of reversing and parking, a reversing radar has appeared on the market. The reversing radar is also called parking assistance system. The principle of ultrasonic transmission and reception, when the driver is reversing, the reversing radar is activated. Under the control of the controller, the probe on the rear bumper of the device sends ultrasonic waves. When an ob...

AI Technical Summary

Problems solved by technology

In many cases, the straight-line distance between the obstacle and the ultrasonic probe is not equal to the vertical distance between the obstacle and the vehicle body, and the straight-line distance cannot represent the accurate distance between the car and the obstacle; The straight-line distance between represents the vertical distance between the obstacle and the body, which will bring a large error

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