KR100193434B1 - Side Collision Avoidance Alarm System - Google Patents

Abstract

The present invention relates to a lateral collision prevention alarm device of a vehicle, and more particularly, to detect a mobile obstacle that can possibly collide with a fixed obstacle that does not have a possibility of collision and to suppress excessive alarm for collision with the own vehicle. The present invention relates to a side collision avoidance alarm device.

To this end, the present invention calculates the distance from the obstacle by checking the time until the reflection and return after firing the ultrasonic wave, and alerts when the distance between the obstacle and the host vehicle is within a predetermined alarm distance determined that there is a possibility of collision. In the side collision prevention alarm device of the vehicle which is supposed to emit,

A frequency discriminator 40 for discriminating the frequency of the ultrasonic signal received by the obstacle and outputting a square wave signal having a frequency equal to the determined frequency, and a frequency and transmission of the square wave signal received from the frequency discriminator 40 The microprocessor 20 is configured to determine whether the obstacle moves according to the calculated frequency difference by calculating the difference between the frequencies of the ultrasonic signals, and to generate an alarm only when it is determined that the obstacle is moving.

Description

Side Collision Avoidance Alarm System

The present invention relates to a lateral collision prevention alarm device of a vehicle, and more particularly, to detect a mobile obstacle that can possibly collide with a fixed obstacle that does not have a possibility of collision and to suppress excessive alarm for collision with the own vehicle. The present invention relates to a side collision avoidance alarm device.

Recently, a system for preventing various safety accidents that may occur while driving a vehicle has been developed and mounted on the vehicle one after another. For example, a front collision prevention warning system that warns of a danger of collision between a host vehicle and a preceding vehicle. There is a lateral collision avoidance alarm system that alerts you to the risk of collision between vehicles and side objects.

Among these, the side collision avoidance warning system is a device for securing the safety of the vehicle and the driver in a blind spot that the driver's vision does not reach when changing the driving lane of the vehicle, parking or driving, Figure 1 is a conventional side collision avoidance warning system Figure 2 is a block diagram of, and Figure 2 is a view for explaining the problem of the conventional vehicle side collision avoidance warning system.

First, as shown in FIG. 1, the conventional collision avoidance warning system of a vehicle includes an ultrasonic sensor 13 for generating ultrasonic waves to detect an obstacle, a sensor driver 12 for driving the ultrasonic sensor 13, An oscillator 11 connected to the sensor driver 12 to generate a resonant frequency of 40 kHz, a preamplifier 14 connected to a receiving end of the ultrasonic sensor 13 and amplifying an output signal, and connected to a preamplifier 14 A band filter 15 for passing only a part of the amplified signal, a detector 16 connected to the band filter 15 to detect an output signal of the band filter 15, and an output of the obstacle in comparison with the output of the detector 16; The reference voltage generator 17 for generating a reference voltage for determining whether there is a presence or absence, the comparator 18 for comparing the output signal of the detector 16 and the voltage signal of the reference voltage generator 17, the comparator 18 Detects the presence of obstacles by receiving the output signal In addition to the disconnection of the ultrasonic sensor 13 and the abnormal operation of the other components, and outputs a drive signal to the oscillator 11 to operate the ultrasonic sensor microprocessor 20, when detecting the obstacle and of the ultrasonic sensor It consists of a buzzer 22 and an alarm lamp 21 for generating an alarm sound when an error occurs, and an alarm driver 19 for driving the buzzer and the alarm lamp under the control of the microprocessor 20.

Furthermore, although omitted for convenience, the ultrasonic sensors are provided for each of the front, rear, left, and right sides of the vehicle.

On the other hand, the side collision warning system of a conventional vehicle having the above-described configuration detects obstacles present in blind spots, such as the rear side of the rear of the vehicle that cannot be visually determined by the ultrasonic sensor, calculates the distance to the obstacles, and determines the possibility of collision. If there is a possibility of collision, the driver is alerted so that collision with an obstacle can be prevented.

In this configuration, the ultrasonic signal generated from the ultrasonic sensor has a resonant frequency of 40 KHz, but the ultrasonic signal output at the resonant frequency of 40 KHz exhibits the optimum sensitivity.

On the other hand, as shown in FIG. 2, when the host vehicle 30 is traveling at a predetermined speed or more along the rightmost lane, the guard rail 31, the telegraph pole 32, the street lamp 33, and the like installed on the sidewalk are ultrasonic sensors. Although there is no possibility of a collision because it is located in the detection area of the system, there is a problem of lowering the reliability of the collision avoidance warning system.

Accordingly, the present invention has been made to solve such a conventional problem, and its purpose is to selectively detect a fixed object which is not likely to collide with a moving object that is likely to collide, and perform a more accurate alarm against collision prevention. It is to provide a vehicle side collision prevention alarm device that can be.

1 is a block diagram showing the configuration of a conventional collision avoidance warning device of a vehicle,

Figure 2 is a view showing a problem of the conventional vehicle side collision avoidance alarm,

Figure 3 is a block diagram showing the configuration of a side collision prevention alarm device of a vehicle according to the present invention,

4 is a waveform diagram illustrating signal waveforms of the ultrasonic sensor and the frequency discriminator of FIG. 3.

Explanation of symbols on the main parts of the drawings

11 ... oscillation part, 12 ... sensor driving part

13 ultrasonic sensor, 14 preamplifier,

15 ... band filter, 16 ... detector.

17 reference voltage generator, 18 comparator,

19 alarm drive, 20 microprocessor,

21 alarm lamp, 22 buzzer,

40 ... frequency discriminator.

In order to realize the above object, the side collision avoidance warning device of a vehicle according to the present invention calculates the distance between the obstacle and the distance between the obstacle and the own vehicle by checking the time until the reflection is returned after the ultrasonic wave is emitted. In the side collision avoidance warning device of a vehicle, which is configured to emit an alarm when it is within a predetermined alarm distance determined to be,

A frequency discriminator for determining the frequency of the ultrasonic signal reflected by the obstacle and outputting a square wave signal having the same frequency as the determined frequency, and a difference between the frequency of the square wave signal received from the frequency discriminator and the frequency of the transmitted ultrasonic signal Determine whether the obstacle is moved according to the calculated frequency difference, and include a microprocessor configured to generate an alarm only when it is determined that the obstacle is moving. It is characterized by being able to.

Hereinafter, the configuration and the effect according to the preferred embodiment of the present invention will be described in detail.

Figure 3 is a control block diagram showing the configuration of the side collision prevention alarm device of the vehicle according to the present invention. As shown in FIG. 3, it is connected to an ultrasonic sensor 13 generating ultrasonic waves, a sensor driving unit 12 driving the ultrasonic sensor 13, and a sensor driving unit 12 to detect an obstacle, and a resonance of 40 KHz. A band filter connected to an oscillator 11 generating a frequency, a preamplifier 14 connected to a receiving end of the ultrasonic sensor 13, and amplifying an output signal, and a band filter passing only a part of the amplified signal ( 15) generating a reference voltage connected to the band filter 15 to generate a reference voltage for judging the presence or absence of an obstacle in comparison with the output of the detector 16 and the detector 16 for detecting the output signal of the band filter 15; A reference voltage generator 17 and a frequency discriminator for outputting a square wave signal having a frequency varied according to whether the obstacle is moved by comparing the output signal of the detector with a predetermined reference voltage, the output signal of the detector 16 and the Standard war In addition to detecting the presence of obstacles by receiving the output signal of the comparator 18 and the comparator 18 comparing the voltage signals of the generator 17, and determining the disconnection of the ultrasonic sensor 13 and the abnormal operation of the other components, Microprocessor 20 for operating the ultrasonic sensor by outputting a drive signal to the oscillation unit 11, a buzzer 22 and an alarm lamp 21, micro to generate an alarm sound when an obstacle is detected and when an error of the ultrasonic sensor occurs An alarm driver 19 for driving the buzzer and the alarm lamp under the control of the processor 20 is provided.

In this configuration, the frequency discriminator 40 uses a Doppler effect. In general, the Doppler effect refers to a change in frequency caused by a motion of making a wave (wave source) or observing (observer), and an ultrasonic sensor. When the ultrasonic signal having a predetermined frequency is reflected on the moving obstacle, the frequency is changed according to the moving direction of the obstacle to be received. However, in the case of a stationary obstacle, an ultrasonic signal having the same frequency as the transmitted frequency is received, and the frequency discriminator 40 determines the frequency change of the received ultrasonic signal reflected by the obstacle and is equal to the determined frequency. A square wave signal having a frequency is output to the microprocessor 20, and the microprocessor 20 compares the frequency of the square wave signal input from the frequency discriminator 40 with the resonant frequency of the ultrasonic sensor output to the oscillator 11. It is determined whether the obstacle is a moving object or a stationary object.

The operation of the side collision avoidance warning device for a vehicle according to the present invention having such a configuration will be described in detail below.

First, the sensor driver 12 oscillates an ultrasonic wave having a predetermined resonance frequency (which is preferably set to 40 KHz as described above), and the ultrasonic signal thus oscillated is reflected by an object present in the sensing area. Preamplifier 14 is amplified to an appropriate size. Next, the amplified detection signal is input to the inverting terminal of the comparator 18 through the band filter 15 and the detector 16 which pass only signals of a predetermined frequency band.

On the other hand, the microprocessor 20 inputs a reference voltage waveform having a predetermined size to the non-inverting terminal of the comparator 18 through the reference voltage generator 17 at the same time as the driving of the ultrasonic waves. At this time, if the comparison result of the comparator 18 and the signal received and reflected by the object is greater than the reference voltage input to the non-inverting terminal by the reference voltage generator 17, the comparator 18 is a predetermined level ( For example, a signal of 0g low 0h level) is input. When the low signal is input, the microprocessor 20 calculates the distance between the obstacle and the own vehicle reflecting the ultrasonic signal by using the time difference from the time when the ultrasonic signal is generated through the sensor driver 12 to the time when the low signal is input. Based on the calculated result, it is determined whether an obstacle exists within a preset alarm distance section.

In addition, the reflected ultrasonic signal amplified and filtered to a predetermined size via the preamplifier 14 and the band pass filter 15 is input to the detector 16 and input to the frequency discriminator 40. As shown in the signal waveform diagram shown in FIG. 4, the preset 40 compares a predetermined reference voltage with a reflected ultrasonic signal input through the band pass filter 15 and converts a square wave signal according to the comparison result into a microprocessor ( 20). At this time, the square wave signal output from the frequency discriminator 40 is a signal having a predetermined frequency difference from the ultrasonic signal output from the sensor driver 12 according to the moving speed of the obstacle.

Therefore, in the microprocessor 20, the distance between the host vehicle and the obstacle calculated based on the output signal of the comparator 18 and the output signal of the frequency discriminator 40 are different from the obstacles currently located on the side of the host vehicle. It is determined whether the vehicle is driving in a lane or a fixed obstacle such as a street light, a guard rail, a roadside tree, etc. existing at a roadside.

That is, if the frequency of the square wave signal input from the frequency discriminator 40 has the same frequency as the ultrasonic signal generated from the ultrasonic sensor, even if an obstacle is detected, it is an object that does not have a possibility of collision, such as a street light or a roadside road. It does not occur. However, if it is determined that the square wave signal input from the frequency discriminator 40 and the ultrasonic signal generated from the ultrasonic sensor have a predetermined frequency difference while the obstacle is detected, it is a vehicle that is traveling at a constant speed in another lane and thus collides. It is determined that there is a possibility to drive the buzzer 22 and the alarm lamp 21 through the alarm driver 19 to alert the driver that there is an obstacle.

As described above, even when an obstacle is detected on the side of the host vehicle by the ultrasonic sensor by the side collision prevention alarm of the vehicle according to the present invention, the obstacle is a moving obstacle such as a vehicle or is stopped like a street lamp on a roadside. By detecting an obstacle and generating an alarm only in the case of a moving obstacle with a possibility of collision, it is possible to suppress excessive alarm on an object that is not likely to collide, thereby improving the reliability of the side collision prevention alarm device. .

Claims (1)

After the ultrasonic wave is fired, the time between the reflection and the return is checked to calculate the distance between the obstacle, and when the distance between the obstacle and the own vehicle is within a predetermined alarm distance determined that there is a possibility of collision, In the side collision prevention alarm device, A frequency discriminator for discriminating the frequency of the ultrasonic signal received by the obstacle and outputting a square wave signal having the same frequency as the determined frequency; Calculate the difference between the frequency of the square wave signal input from the frequency discriminator and the frequency of the transmitted ultrasonic signal, and determine whether the obstacle moves according to the calculated frequency difference, and generate an alarm only when it is determined that the obstacle is moving. The side collision prevention alarm device of a vehicle, characterized in that it is provided with a microprocessor to suppress the excessive alarm for a fixed obstacle that is not likely to crash.