KR0164482B1 - Abnormal functioning detecting method for warning system of side collision of an automobile - Google Patents

Abstract

According to the present invention, an abnormality such as a side collision warning system of a vehicle which can detect an abnormal operation such as disconnection and malfunction of an ultrasonic sensor in a collision prevention alarm system using an ultrasonic sensor based on a software configuration without adding a separate configuration. It relates to a motion detection method. The abnormal motion detection method of the side collision warning system of the vehicle of the present invention calculates the distance from the obstacle by checking the time until the return after largely firing ultrasonic waves, and when the distance from the obstacle is within a predetermined warning interval distance. A side collision warning system for a vehicle, which is configured to alert a vehicle, the method comprising: (1) generating and firing a first reference waveform compared with an excitation waveform and a reflection waveform of ultrasonic waves corresponding to normal operation of the system; (2) intermittently generating and firing a second reference waveform compared with the excitation waveform of ultrasonic waves corresponding to the abnormal operation of the system; and (3) the abnormal operation of the system as a result of the comparison in step (2). In this case, it characterized in that the step consisting of alarming abnormal operation.

Description

Abnormal motion detection method of vehicle side collision warning system

The present invention relates to a method for detecting abnormal operation of a side collision warning system of a vehicle, and in particular, in a collision avoidance alarm system using an ultrasonic sensor, a side collision alarm of a vehicle capable of detecting abnormal operation such as disconnection and malfunction of an ultrasonic sensor. The present invention relates to a method for detecting abnormal operation of a system.

In general, the side collision warning system of the vehicle is to ensure the safety of the vehicle and the driver in a blind spot that the driver's field of view does not reach when the driving lane of the vehicle changes, parking or driving.

As shown in FIG. 1, the configuration of a side impact warning system of a conventional vehicle includes an ultrasonic sensor 13 for generating ultrasonic waves for detecting an obstacle, a sensor driver 12 for driving the ultrasonic sensor 13, Oscillator 11 connected to the sensor driver 12 to generate a resonant frequency of 40 (KHz), preamplifier 14 and preamplifier 14 connected to the receiving end of the ultrasonic sensor 13 to amplify the output signal. And a band filter 15 for passing only a part of the amplified signal and a detector 16 connected to the band filter 15 to detect an output signal of the band filter 15, and the output of the detector 16. A reference voltage generator 17 for generating a reference voltage for determining the presence or absence of an obstacle, a comparator 18 for comparing the output signal of the detector 16 with a voltage signal of the reference voltage generator 17, and a comparator 18 Presence of obstacles A microprocessor 10 for operating the ultrasonic sensor 13 by outputting a driving signal to the oscillator 11, a buzzer 20 and an alarm lamp 21 for generating an alarm sound when an obstacle is detected; The alarm driver 19 drives the buzzer 20 and the alarm lamp 21 under the control of the microprocessor 10.

The operation of the conventional collision avoidance warning system having the above-described configuration will be described with reference to FIG. 2, and the ultrasonic sensor 13 is driven by receiving a predetermined oscillation waveform from the oscillation unit 11. The waveform of the T1-T2 section of the oscillation waveform is generated when the ultrasonic sensor 13 oscillates, the waveform of the T2-T3 section of Figure 2 (a) shows the excitation waveform generated when the ultrasonic sensor 13 oscillates. will be. 2B is an output waveform of the reference voltage generator 17, and C is a waveform of a signal output after the signal received by the detector 16 of the ultrasonic sensor 13 is detected. The waveform in the T1-T3 section is a waveform generated by driving and excitation of the ultrasonic sensor 13, and the waveform in the T4 section is a reflection input signal received by the receiving unit of the ultrasonic sensor 13 after being reflected by an obstacle. In addition, (D) shows the output waveform of the comparator 18 comparing the output waveform of the reference voltage generator 17 and the input waveform of the detector 16. The square wave pulse of the T4 section is inputted from the microprocessor 10. It calculates the presence or absence of obstacles and the distance between obstacles and own vehicle.

That is, since the reference voltage (Fig. 2 (b)) generated by the reference voltage generator 17 which is operated by receiving a predetermined control signal from the microprocessor 10 is applied to the other terminal of the comparator 18, the ultrasound The microprocessor 10 which receives the predetermined signal according to the comparison result from the comparator 18 is outputted to the microprocessor 10 by comparing the signal input from the sensor 13 to the input signal. By determining the presence of the obstacle, if there is an obstacle, and outputs a signal to the alarm driver 19 to drive the buzzer 20 and the alarm lamp 21 to inform the user of the presence of the obstacle.

However, in the conventional system that performs the above-described operation, since there is no means for checking the abnormal state of the system such as disconnection of the ultrasonic sensor, there is a possibility of causing a fatal danger to the driver who trusts the system.

In order to improve this, in addition to the existing configuration, the abnormal state detection unit 30 is further provided that an abnormal state has occurred in the system due to the disconnection of the ultrasonic sensor 13 and the abnormality of other parts, and the abnormal state detection unit 30 It consists of a reference voltage generator 31 and a comparator 32.

In the conventional system, when the ultrasonic sensor 13 is disconnected or malfunctioned by another component, as illustrated in FIG. 3A, the sensor driver 12 receives the control signal of the microprocessor 10. Since the ultrasonic sensor 13 is not oscillated even when driven, the excitation waveform according to the driving of the ultrasonic sensor 13 is not generated in the section T2-T3 of FIG. At this time, the reference voltage generator 31 of the abnormal state detection unit 30 outputs a signal (a signal reaching only the T1-T2 section) as shown in FIG. 3B and provides it to the non-inverting terminal of the comparator 32. The output of the detector 16 is input to the inverting terminal of the comparator 32 as shown in FIG. Therefore, the output terminal of the comparator 32 goes low after the time point T3, and the microprocessor 10 determines that the ultrasonic sensor 13 is not normally operating based on this, and the buzzer 20 is connected to the alarm driver 19. And output a control signal to drive the alarm lamp 21. Therefore, the driver can check the abnormal state such as disconnection of the ultrasonic sensor 13.

However, according to the abnormal motion detection device of the side collision warning system of a conventional vehicle as described above, in order to detect an abnormal condition such as disconnection of the ultrasonic sensor, the cost is increased by adding an abnormal state detection unit comprising a reference voltage generator and a comparator. There was an issue that was raised.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and in the anti-collision alarm system using an ultrasonic sensor, an abnormal operation such as disconnection and malfunction of the ultrasonic sensor can be detected based on a software configuration without adding a separate configuration. The object of the present invention is to provide an abnormal motion detection method of a side collision warning system of a vehicle.

1 is a block diagram of a side collision warning system of a conventional vehicle;

2 is a signal waveform diagram in a normal operation of a side collision warning system of a conventional vehicle;

3 is a signal waveform at the time of abnormal operation of the side collision warning system of a conventional vehicle;

Figure 4 is a block diagram of a side collision warning system of a vehicle to which the detection method of the present invention is applied,

5 is a signal waveform diagram in the normal operation of the side collision warning system of a vehicle to which the detection method of the present invention is applied;

6 is a signal waveform diagram of abnormal operation of the side collision warning system of a vehicle to which the detection method of the present invention is applied.

* Explanation of symbols for main parts of the drawings

10: microprocessor, 11: oscillation unit,

12: sensor drive unit, 13: ultrasonic sensor,

14: preamplifier, 15: band filter,

16: detector, 17: reference voltage generator,

18: comparator, 19: alarm driving unit,

20: buzzer, 21: alarm lamp,

30: abnormal state detection unit, 31: reference voltage generator,

32: comparator

Abnormal motion detection method of the side impact warning system of the vehicle of the present invention for achieving the above object largely check the time until the return after firing the ultrasonic wave to calculate the distance to the obstacle, the distance from the obstacle is predetermined In the side collision warning system of a vehicle that is to be alerted when it is within the alarm interval distance of (1), the first reference waveform is compared with the excitation waveform and the reflected waveform of the ultrasonic wave when the system operates normally. Generating and firing; (2) intermittently generating and firing a second reference waveform compared with the excitation waveform of ultrasonic waves corresponding to the abnormal operation of the system; and (3) the abnormal operation of the system as a result of the comparison in step (2). In this case, it characterized in that the step consisting of alarming abnormal operation.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, and the same parts as in the prior art will be described with the same reference numerals.

Figure 4 is a block diagram of a side collision warning system of a vehicle according to the present invention. As shown in Figure 4, the configuration of the side impact warning system of the vehicle of the present invention, the ultrasonic sensor 13 for generating an ultrasonic wave to detect the obstacle, the sensor driver 12 for driving the ultrasonic sensor 13, Oscillator 11 connected to the sensor driver 12 to generate a resonant frequency of 40 (KHz), preamplifier 14 and preamplifier 14 connected to the receiving end of the ultrasonic sensor 13 to amplify the output signal. And a band filter 15 for passing only a part of the amplified signal and a detector 16 connected to the band filter 15 to detect an output signal of the band filter 15, and the output of the detector 16. A reference voltage generator 17 for generating a reference voltage for determining the presence or absence of an obstacle, a comparator 18 for comparing the output signal of the detector 16 with a voltage signal of the reference voltage generator 17, and a comparator 18 Receiving the presence of obstacles The microprocessor 10 which determines the disconnection of the ultrasonic sensor 13 and the abnormal operation of the other parts, outputs a driving signal to the oscillator 11, and operates the ultrasonic sensor 13, in addition to detecting the obstacle. And an alarm driver for driving the buzzer 20 and the alarm lamp 21 according to the control of the buzzer 20, the alarm lamp 21, and the microprocessor 10 that generate an alarm sound when an error of the ultrasonic sensor 13 occurs. (19), the abnormal state detection unit 30 as in the prior art is not required.

Hereinafter, the operation of the abnormal motion detection method of the side collision warning system of the vehicle having the above-described configuration will be described in detail.

FIG. 5 is a signal waveform diagram in the normal operation of the side collision warning system of a vehicle to which the present invention is applied, and FIG. 6 is a signal waveform diagram in the abnormal operation of the side collision warning system of the vehicle to which the present invention is applied.

First, the case where the side collision warning system operates normally will be described. When the ultrasonic sensor 13 is driven by the sensor driver 12, 40 (KHz) ultrasonic waves are oscillated as shown in FIG. 5 (a), and the waveform of (a) is converted into the preamplifier 14 and the band filter. If (15) and the detector 16 are sequentially passed, the waveform is the same as (c), and the waveform of (c) is then input to the inverting terminal of the comparator 18.

On the other hand, the microprocessor 10 uses the comparator 18 through the reference voltage generator 17 to generate a reference voltage waveform (waveform in which the period reaches T1-T4), such as the waveform of FIG. In the non-inverting terminal. In the waveform of (c) of FIG. 5, the waveform from T1 to T4 is an excitation waveform generated when the ultrasonic sensor 13 is driven. When the waveform (b) and the waveform (c) to T1 to T4 are compared, You can see the signal coming into the object. For this reason, the waveform from T1 to T4 in the waveform of FIG. 5B is generated by the reference voltage generator 17 and input to the comparator 18.

Next, when the signal Vdet coming to the object in the waveform of FIG. 5C is input to the inverting terminal of the comparator 18, the voltage difference is greater than the reference voltage Vref of FIG. The comparator 18 inputs a low signal to the microprocessor 10. When the low signal is input, the microprocessor 10 calculates the distance by using the time difference from the time T1 driven through the sensor driver 12 to the time T5, at which the low signal is input (L = c * t / 2, here Where L is the distance, c is the speed of ultrasonic waves, t is the time), and if an object exists in the alarm distance section, the buzzer 20 and the alarm lamp 21 are driven through the alarm driver 19 to the driver. You will be alerted that there is an obstacle near the rear close range.

Next, the case where the ultrasonic sensor 13 malfunctions will be described. When the ultrasonic sensor 13 is disconnected, the excitation waveforms up to the section T2-T3 of FIG. 6A do not exist. Therefore, the received signal detected through the detector 16 is also input to the inverting terminal of the comparator 18 as shown in the waveform (c) of FIG. 6.

On the other hand, the microprocessor 10 of the comparator 18 at a predetermined time interval to the waveform (waveform from T1 to T2) shorter than the above-described waveform (b) of FIG. The abnormal operation of the ultrasonic sensor 13 is checked by inputting the non-inverting terminal.

In more detail, the microprocessor 10 checks the output waveform of the comparator 18 at the time T3, and the output waveform of the comparator 18 at the time T3 is as shown in FIG. If it becomes a waveform, it is judged that an excitation waveform exists normally.

However, if the output waveform of the comparator 18 at the time point T3 is in the high level as shown in (d) of FIG. 6, the excitation waveform does not exist, that is, it is determined that the ultrasonic sensor 13 does not operate normally. In operation, the buzzer 20 and the alarm lamp 21 are driven in a manner different from that of alerting that there is an obstacle, thereby informing the driver that there is an error in the system.

This invention is not limited to the above-mentioned embodiment, It can be variously modified and implemented within the range which the technical idea of this invention allows.

According to the abnormal operation detection method of the side collision warning system of the vehicle as described above, it is possible to reduce the cost by detecting the abnormal operation of the system without adding a separate component to the existing configuration.

Claims (1)

In the side collision warning system of a vehicle, the distance from the obstacle is calculated by checking the time until returning after the ultrasonic wave is emitted, and an alarm is issued when the distance from the obstacle is within a predetermined warning interval distance. (1) generating and firing a first reference waveform compared with the excitation waveform and the reflection waveform of the ultrasound corresponding to the case where the system is operating normally; (2) intermittently generating and firing a second reference waveform compared with the excitation waveform of the ultrasonic wave corresponding to the abnormal operation of the system; and (3) The abnormal operation detection method of the side collision warning system of the vehicle, characterized in that the step of alarming the abnormal operation when the system is abnormal operation as a result of the comparison in the step (2).