KR0174233B1 - Crash prevention alarm device - Google Patents

Abstract

The present invention relates to an anti-collision warning device for a vehicle in which an error such as disconnection and malfunction of an ultrasonic sensor is detected and displayed on the outside.

The configuration includes an ultrasonic sensor 13 which emits ultrasonic waves so as to warn of the danger of collision, and a reference voltage generator 17 which receives the signal received from the ultrasonic sensor 13 after being reflected by the obstacle. A comparator 18 for receiving a reference voltage signal from the comparator and comparing the two input signals to output a signal according to the presence or absence of an obstacle, and calculating the presence or absence of an obstacle and a collision possibility by receiving the signal from the comparator 18 An anti-collision warning device for a vehicle having a microprocessor (10) which performs an alarm operation through an alarm means (20, 21) when there is a risk of collision with an obstacle. The microprocessor is configured to output a reference voltage signal for a time corresponding to the output time of the oscillation wave for operating the ultrasonic sensor 13 by receiving a control signal. The reference voltage generator 31 connected to the book 10 and the reference voltage signal from the reference voltage generator 31 receive the output signal from the ultrasonic sensor 13 and compare the two input signals. When the excitation wave generated during the normal operation of the ultrasonic sensor 13 does not exist in the signal input from the ultrasonic sensor 13, a signal indicating the abnormal state of the ultrasonic sensor 13 is output to the microprocessor 10 so that the The microprocessor 10 is characterized by consisting of the reference voltage generator 31, the output side of the ultrasonic sensor 13 and the comparator 32 connected to the microprocessor 10 so that the alarm operation can be performed. .

Description

Vehicle anti-collision alarm

1 is a control block diagram showing the configuration of a conventional anti-collision warning device.

2 is a control block diagram showing the configuration of an anti-collision warning device according to the present invention.

Figure 3 is a detailed circuit diagram showing the configuration of the anti-collision warning device according to the present invention.

4 is an output waveform diagram of each part in the normal operation of the anti-collision warning device according to the present invention.

5 is an output waveform diagram of each part during abnormal operation of the collision avoidance warning device according to the present invention.

* Explanation of symbols for main parts of the drawings

17: reference voltage generator 18: comparator

30: abnormal state detection unit 31: reference voltage generation unit

32: comparison unit

The present invention relates to an anti-collision warning device for a vehicle, and more particularly, to an anti-collision warning device for detecting an error such as disconnection and malfunction of an ultrasonic sensor in an anti-collision alarm device using an ultrasonic sensor and displaying it externally. .

In general, an anti-collision warning device for a vehicle detects obstacles in front of, behind, or behind the vehicle in advance and warns in advance if there is a risk of contact accident between the vehicle and the obstacle when the driving lane is changed, or when parking or driving. This is a safety device to ensure the safety of the vehicle and the driver.

The configuration of the conventional vehicle anti-collision warning device, as shown in Figure 1, is equipped with an ultrasonic sensor 13 for detecting the presence or absence of obstacles by emitting ultrasonic waves to the front, rear or side of the vehicle, A sensor driver 12 for driving the ultrasonic sensor 13 is connected to an input terminal of the ultrasonic sensor 13, and an oscillator 11 for generating and supplying a resonance frequency of 40 kHz is connected to an input terminal of the sensor driver 12. . In addition, a preamplifier 14 for amplifying the output signal from the ultrasonic sensor 13 is connected to the output terminal of the ultrasonic sensor 13, and a band pass filter for removing a part of the amplified signal to the output terminal of the preamplifier 14. 15 is connected, and a detector 16 for detecting an output signal of the band pass filter is connected to an output terminal of the band pass filter 15. In addition, the output terminal of the detector 16 receives the output from the detector 16 and receives the output from the reference voltage generator 17 for generating a reference voltage for determining the presence or absence of the obstacle, the signal according to the presence or absence of the obstacle A comparator 18 for outputting a microprocessor is connected to the microprocessor for detecting an obstacle and receiving an output signal from the comparator 18, and outputting a control signal to operate the ultrasonic sensor 13 to the oscillator 11. 10) is provided. In addition, an alarm driver 19 for driving an alarm and a buzzer 20 for generating an alarm sound when an obstacle is detected are connected to an output terminal of the microprocessor 10.

The operation of the conventional vehicle anti-collision warning device having such a configuration is as follows. When obstacles exist in the proximity of the vehicle, the ultrasonic waves emitted from the transmitter of the ultrasonic sensor 13 are reflected by the obstacle and received by the receiver of the ultrasonic sensor 13. The received signal is amplified to be suitable for signal processing in the preamplifier 14 and then applied to the band pass filter 15 so that only a necessary portion of the input signal thereof, that is, a signal having a frequency band of 40 KHz, is filtered out and the detector 16 is applied. Is detected and input to one terminal of the comparator 16. At the same time, a reference voltage signal having a predetermined time is input from the reference voltage generator 17 operated based on the control signal of the microprocessor 10 to the other terminal of the comparator 16. The comparator 16 compares the two input signals and outputs a square wave signal according to the result of the comparison to the microprocessor 10. The microprocessor 10 calculates the possibility of collision (or collision) between the host vehicle and the obstacle based on the input square wave signal, and outputs a control signal to the alarm driver 19 when there is a risk of collision with the obstacle as a result of the calculation. Accordingly, a buzzer sounds from the buzzer and the driver is warned in advance of the risk of collision between the vehicle and the obstacle.

However, such a conventional vehicle anti-collision warning device has a problem that it is not possible to detect the error state of the alarm operation due to disconnection of the ultrasonic sensor and malfunction of other devices. That is, even if the ultrasonic wave is not fired due to disconnection or malfunction of other equipment, it is not detected and it is judged that there is no signal reflected from the obstacle. Accordingly, there is a problem that the reliability of the device is deteriorated, which is contrary to the purpose of securing the safety of the original driver and the vehicle.

The present invention has been made to solve the above-described problems, the object of which is to detect the disconnection of the ultrasonic sensor and the malfunction by other devices and to alert the driver to maximize the reliability of the device at the same time An anti-collision warning device for a vehicle is provided.

In order to realize the above object, an anti-collision warning device for a vehicle according to the present invention includes an ultrasonic sensor for emitting an ultrasonic wave so as to detect an obstacle present in a close distance of the own vehicle, and an ultrasonic firing time point during the ultrasonic firing from the ultrasonic sensor. A reference voltage generator for outputting a reference voltage signal approximately equal to the extinction time of the excitation wave generated during normal operation of the ultrasonic sensor for detection, and receiving a reference voltage signal from the reference voltage generator and outputting an output signal from the ultrasonic sensor. A comparator connected to the reference voltage generator and the output side of the ultrasonic sensor so that a signal according to the presence or absence of an obstacle is output by comparing the two signals, and calculating the possibility of collision with the obstacle based on the output signal of the comparator As a result, if there is a risk of collision, An anti-collision warning device for a vehicle provided with a microprocessor connected to a comparator and an alarm means connected to the microprocessor to receive a control signal from the microprocessor and to alert a collision risk, wherein the anti-collision warning operation is controlled from the microprocessor during the collision prevention alarm operation. A reference voltage generator connected to the microprocessor and a reference voltage signal from the reference voltage generator for inputting a reference voltage signal for a time corresponding to an output time of the oscillation wave for operating the ultrasonic sensor by receiving a signal; Receiving an output signal from the ultrasonic sensor and comparing the two input signals, when the excitation wave generated during normal operation of the ultrasonic sensor does not exist in the signal inputted from the ultrasonic sensor, a signal indicating an abnormal state of the ultrasonic sensor is detected by the microcontroller. Output to processor Air and the microprocessor is characterized in that it includes a comparator connected to the reference voltage generating portion and the output side and the microprocessor of the ultrasonic sensor to perform the alarm operation.

Hereinafter, with reference to the accompanying drawings, the embodiment of the vehicle anti-collision warning device according to the present invention will be described in detail the configuration and effect.

2 is a control block diagram showing the configuration of the anti-collision warning device according to the present invention, FIG. 3 is a detailed circuit diagram showing the configuration of the anti-collision warning device according to the present invention, and FIG. 4 is the normality of the anti-collision warning device according to the present invention. Output waveform diagram of each part in operation, Figure 5 is an output waveform diagram of each part in the abnormal operation of the collision avoidance warning device according to the present invention.

The present invention is characterized by detecting the abnormal state of the ultrasonic sensor by using the presence or absence of the excitation wave generated when the ultrasonic sensor operates normally and alerts the driver.

First, the configuration of the vehicle anti-collision warning apparatus according to the present invention, as shown in Figures 2 to 5, the ultrasonic sensor 13 for detecting the presence of obstacles by firing ultrasonic waves in the front, rear or side of the vehicle. Is mounted, and the sensor driver 12 for driving the ultrasonic sensor 13 is connected to an input terminal of the ultrasonic sensor 13, and an oscillator for generating and supplying a resonance frequency of 40 kHz to the input terminal of the sensor driver 12. (11) is connected.

In addition, a preamplifier 14 for amplifying the output signal from the ultrasonic sensor 13 is connected to the output terminal of the ultrasonic sensor 13, and a band pass filter for removing a part of the amplified signal to the output terminal of the preamplifier 14. 15 is connected, and a detector 16 for detecting an output signal of the band pass filter is connected to an output terminal of the band pass filter 15.

In addition, the output terminal of the detector 16, the signal according to the abnormal state of the ultrasonic sensor 13 due to the disconnection of the comparator 18 and the ultrasonic sensor 13 or a malfunction of the other device to output a signal according to the presence or absence of obstacles The comparator 32 which outputs the parallel part is connected in parallel.

That is, the comparator 18 has an input terminal connected to the output terminal of the detector 16, and the other input terminal is connected to the output terminal of the reference voltage generator 17 which generates a reference voltage signal for determining the presence of an obstacle. It is connected and outputs a square wave signal according to the presence or absence of an obstacle by comparing two input signals. Here, the reference voltage generator 17 is operated by receiving a removal signal from the microprocessor 10, the output signal of the microprocessor 10 so that the excitation wave generated due to the normal operation of the ultrasonic sensor is approximately coincided with the time to disappear. Is set in.

The comparator 32 has one input terminal thereof connected to an output terminal of the detector 16, and the other input terminal thereof has an abnormality of the ultrasonic sensor 13 due to disconnection of the ultrasonic sensor 13 or malfunction of another device. Abnormality of the ultrasonic sensor 13 due to disconnection or malfunction of the ultrasonic sensor 13 by being connected to the output terminal of the reference voltage generator 31 for generating a reference voltage signal for determining the state and comparing the two input signals. Output square wave signal according to the state. Here, the reference voltage generator 31 is operated by receiving a control signal from the microprocessor 10, the output signal is the output time of the oscillation wave for operating the ultrasonic sensor 13 to detect the excitation generation of the ultrasonic sensor Is set in the microprocessor 10 to approximately match.

That is, the reference voltage generator 31 and the comparison unit 32 are added to detect the presence or absence of the excitation wave generated in accordance with the normal operation of the ultrasonic sensor 13. In general, when the ultrasonic sensor 13 operates normally, the input waveform of the preamplifier 14 is an oscillation waveform (T1-T2 section) followed by an excitation waveform (T2-T3 section) as shown in FIG. Appears. However, when the ultrasonic sensor 13 is internally disconnected, the ultrasonic wave is not emitted and the waveform of the input side of the preamplifier 14 is the oscillation waveform (T1-T2 section) as shown in FIG. Only appears. Therefore, in the abnormal state of the ultrasonic sensor 13, only the oscillation wave passes through the preamplifier 14, the band pass filter 15, and the detector 16, and the input side of the comparator 18 and the input side of the comparator 32. It is input to the terminal. (c ') is the output waveform from the detector 16 at this time. In addition, as described above, the signal (e), which is a reference voltage signal, is input from the reference voltage generator 31 to the other input terminal of the comparator 32. Accordingly, the comparator 32 compares the two signals and outputs a square wave as shown in (f). The microprocessor 10, which will be described later, receives a square wave signal from the comparator 32 and detects a signal of the T2-T3 section that maintains the 'high' signal during the normal operation of the ultrasonic sensor 13. The ultrasonic sensor 13 does not operate normally, so that no excitation waveform is generated, that is, the ultrasonic sensor 13 is disconnected or malfunctioned by another device, thereby recognizing an abnormal state in which ultrasonic waves are not fired.

In addition, the comparator 18 and the comparator 32 are connected to receive the output signal of the comparator 18 to detect the presence of an obstacle, and the output signal of the comparator 32 receives the output signal of the ultrasonic sensor It detects an abnormal state of disconnection or malfunction, and outputs a control signal to the alarm driver to be described later to perform an alarm operation according to the detection result, and outputs a control signal to operate the ultrasonic sensor 13 to the oscillator (11) Microprocessor 10 is provided.

In addition, an alarm driver 19 for performing an alarm operation by connecting the buzzer 20 and the alarm lamp 21 when an obstacle is detected or when the ultrasonic sensor is disconnected or malfunctions is connected to the output terminal of the microprocessor 10. At this time, the alarm operation is to distinguish between the detection of the obstacle and the abnormal state of the ultrasonic sensor (13).

In the above-described configuration, when the abnormal state detection unit 30 including the reference voltage generator 31 and the comparison unit 32 is described in detail, the reference voltage generator 31 of the abnormal state detection unit 30 determines the DC voltage. A diode D1 connected to the voltage divider resistors R2 and R3 for dividing to a magnitude and a cathode side connected to an intermediate end of the voltage divider resistors R2 and R3 and output by a control signal output from the microprocessor 10. Equipped. The resistor R1 is connected in parallel to the emitter side of the diode D1, and the capacitor C1 is connected in parallel between the cathode side of the diode D1 and the voltage divider resistors R1 and R2.

The comparator 32 of the abnormal state detection unit 30 receives a voltage divided by the voltage divider resistors R2 and R3, that is, a signal output from the reference voltage generator 31 as a non-inverted signal. The output signal of (16) is inputted as an inverted signal and a result of comparing the non-inverted signal with the inverted signal, that is, a signal according to an abnormal state of the ultrasonic sensor 13 due to disconnection of the ultrasonic sensor 13 or malfunction of other equipment. Comparator device IC1 input to microprocessor 10 is provided. The resistor R4 and the capacitor C2 are connected in parallel to the output terminal of the comparator element IC1.

The operation and effect of the anti-collision warning apparatus according to the present invention having such a configuration will be described below.

First, the normal operation of the collision avoidance warning device will be described with reference to the output waveforms of the respective parts shown in FIG. As the anti-collision warning device is operated, the microprocessor 10 outputs a control signal to the oscillator 11 so that ultrasonic waves are emitted from the ultrasonic sensor 13.

The oscillator 11 receiving the control signal generates a resonance frequency of 40 KHz and supplies it to the sensor driver 12, and the sensor driver 12 applies it to the ultrasonic sensor 13. Ultrasonic waves can be emitted forward, backward or laterally.

(a) is a waveform output from the ultrasonic sensor 13 and input to the preamplifier 14 during the above operation. Here, the waveform of the T1-T2 section is an oscillation waveform for operating the ultrasonic sensor 13, the waveform of the T2-T3 section is an excitation waveform due to the operation of the ultrasonic sensor 13. That is, an excitation waveform occurs when the ultrasonic sensor 13 is normally operated.

In addition, when obstacles exist in the proximity of the host vehicle, ultrasonic waves emitted from the transmitter of the ultrasonic sensor 13 are reflected on the obstacles and received by the receiver of the ultrasonic sensor. The received signal is amplified to be suitable for signal processing in the preamplifier 14 and then applied to the band pass filter 15 so that only a necessary portion of the input signal thereof, that is, a signal having a frequency band of 40 KHz, is filtered out and the detector 16 is applied. Is detected and input to one side terminal of the comparator 18 and one side terminal of the comparator 32 connected in parallel with the comparator 18.

(c) is a waveform output from the detector 16 during the operation described above and input to one terminal of the comparator 18 and one terminal of the comparator 32 connected in parallel with the comparator 18. Here, the waveform of the T1-T3 section is the output waveform according to the operation and excitation of the ultrasonic sensor 13, the waveform of the T4 section is a waveform received after the ultrasonic wave emitted from the ultrasonic sensor 13 is reflected on the obstacle.

In addition, an obstacle from the reference voltage generator 17 which is operated based on the control signal of the microprocessor 10 to the other terminal of the comparator 18 while the output signal of the detector 16 is input to one terminal of the comparator 18. A reference voltage signal for determining the presence or absence of is input.

(b) is a waveform output from the reference voltage generator 17 and input to the other terminal of the comparator 18 during the above operation. Here, the 'high' time of the T1-T3 section is set in the microprocessor 10. The 'high' time is set to be approximately equal to the time when the excitation waveform of (a) disappears as described above.

In addition, the comparator 18 compares two signals input to one terminal and the other terminal and outputs a square wave signal according to the presence or absence of an obstacle to the microprocessor 10.

(d) is a waveform output from the comparator 18 and input to the microprocessor 10 during the above operation. Here, the T1-T3 section is a reference signal for measuring the time when the ultrasonic wave is reflected by the output waveform during the operation of the ultrasonic sensor 13, and the T4 section is the square wave of the output waveform received after being reflected by the obstacle. That is, the microprocessor 10 calculates the reception time of the received rectangular pulse wave after reflecting back to the obstacle based on the square wave input from the comparator 18 and calculates the presence or absence of the obstacle or the distance between the obstacle and the host vehicle. Or collision).

Next, the alarm operation during abnormal operation of the collision avoidance alarm device will be described with reference to the output waveforms of the respective parts shown in FIG. As the anti-collision warning device operates, as described above, the microprocessor 10, the oscillator 11, and the sensor driver 12 sequentially operate to apply an operation signal to the ultrasonic sensor 13. At this time, when the ultrasonic sensor 13 is internally disconnected or an error occurs due to a malfunction of the other device, the ultrasonic wave is not emitted.

(a ') is a waveform output from the ultrasonic sensor 13 and input to the preamplifier 14 during the above operation. Compared with (a), which is the output waveform of the ultrasonic sensor 13 in the normal operation of the ultrasonic sensor 13 described above, in (a '), the oscillation waveform for operating the ultrasonic sensor 13 appears only in the T1-T2 section. Only the excitation waveform in the T2-T3 section due to the operation of the ultrasonic sensor 13 did not appear. That is, although the oscillation wave is input to the ultrasonic sensor 13, it can be seen that the excitation waveform does not occur because the ultrasonic sensor 13 does not operate normally.

In addition, when the ultrasonic wave is not emitted from the ultrasonic sensor 13, only the oscillation wave passes through the preamplifier 14, the band pass filter 15, and the detector 16, and the one side terminal of the comparing unit 32 and the comparing unit ( 32 is input to one terminal of the comparator 18 connected in parallel.

(c ') is a waveform output from the detector 16 during the operation described above and input to one terminal of the comparator 32 and one terminal of the comparator 18 connected in parallel with the comparator 32. . When the waveform c 'is compared with the output waveform of the detector 16 during the normal operation of the ultrasonic sensor 13 described above, the output waveform is generated only in the T1-T2 section, but only in the T2-T3 section. This does not occur. This is because the excitation wave is not generated because the ultrasonic sensor 13 is not operated due to disconnection or malfunction of other equipment.

In addition, the output signal of the detector 16 is input to one terminal of the comparator 32 and the reference voltage generator 31 is operated based on the control signal of the microprocessor 10 to the other terminal of the comparator 32. The reference voltage signal for determining the internal disconnection of the ultrasonic sensor 13 or the malfunction caused by the taki is inputted from the.

(e) is a waveform output from the reference voltage generator 31 and input to the other terminal of the comparator 32 during the above operation. Here, the 'high' time of the T1-T2 section is set in the microprocessor 10 to determine an internal disconnection of the ultrasonic sensor 13 or a malfunction by other devices, and the 'high' time is as described above. As described above, the oscillation waveform for operating the ultrasonic sensor 13 is set to substantially match the output time (T1-T2 section of (a)).

In addition, the comparison unit 32 compares the two signals input to one terminal and the other terminal and outputs a square wave signal due to internal disconnection of the ultrasonic sensor 13 or malfunction by other devices to the microprocessor 10. .

(f) is a waveform output from the comparator 32 and input to the microprocessor 10 during the above operation. Here, when the 'high' signal exists only in the T1-T2 section, it means an abnormal state of the ultrasonic sensor 13 due to internal disconnection of the ultrasonic sensor or other devices, and the 'high' signal exists in the T1-T3 section. In this case, it means the normal state of the ultrasonic sensor. That is, the 'high' signal is input from the reference voltage generator 31 to the T1-T2 section (see (e)), and the excitation wave is not present from the detector 16. Is input (see (c ')), the output from the comparator 32 maintains the' high 'signal only in the T1-T2 section as shown in (f).

Accordingly, the microprocessor 10 checks the output of the comparator 32 in the section T3 of (f), and if the signal is 'low', the microprocessor 10 determines the abnormal state of the ultrasonic sensor 13 and buzzers the alarm driver 19. 20 and the alarm lamp 21 output a control signal. Accordingly, the buzzer 20 and the alarm lamp 21 perform the alarm operation and the driver can check the abnormal state of the ultrasonic sensor 13 by recognizing the abnormal state of the collision preventing device.

As described above, according to the vehicle anti-collision warning device according to the present invention, by detecting the internal disconnection of the ultrasonic sensor and malfunction by other devices, and alerts the driver to the driver to check the collision avoidance device at the same time There is an effect that can maximize the reliability, it is effective to prevent the accident in advance by alerting the driver of the abnormal state of the ultrasonic sensor.

Claims (1)

Ultrasonic sensor 13 for emitting an ultrasonic wave so as to detect an obstacle present in the proximity of the host vehicle, and the normal operation of the ultrasonic sensor 13 to detect the ultrasonic firing time at the time of ultrasonic launch from the ultrasonic sensor 13 A reference voltage generator 17 for outputting a reference voltage signal approximately equal to the extinction time of the excitation wave generated at the time, and receiving a reference voltage signal from the reference voltage generator 17 and outputting an output signal from the ultrasonic sensor 13. The output signal of the comparator 18 and the comparator 18 connected to the output side of the reference voltage generator 17 and the ultrasonic sensor 13 so that a signal according to the presence or absence of an obstacle is output by comparing the two signals The microprocessor 10 connected to the comparator 18 so as to calculate the possibility of collision with the obstacle based on the calculation and output a control signal if there is a risk of collision as a result of the calculation; An anti-collision warning device for a vehicle provided with an alarm driver 19 connected to the microprocessor 10 to receive a control signal from the microprocessor 10 and to alert a collision risk, wherein the microprocessor ( A reference voltage generator 31 connected to the microprocessor 10 for receiving a control signal from the control signal 10 and outputting a reference voltage signal for a time coinciding with the output time of the oscillation wave for operating the ultrasonic sensor 13. And an input of a reference voltage signal from the reference voltage generator 31, an output signal from the ultrasonic sensor 13, and comparing the two input signals to an input signal from the ultrasonic sensor 13. When there is no excitation wave generated during the normal operation of 13, a signal indicating an abnormal state of the ultrasonic sensor 13 is sent to the microprocessor 10. The reference voltage generator 31 and the output side of the ultrasonic sensor 13 and the comparator 32 connected to the microprocessor 10 so that the microprocessor 10 can perform an alarm operation. Anti-collision warning device for a vehicle, characterized in that.