KR960012788B1 - Apparatus and method for preventing a clash of traffics - Google Patents

Abstract

an ultrasonic transmitting circuit part(10) driving the ultrasonic by generating a clock and transmitting the ultrasonic to an object; an ultrasonic receiving circuit part(20) receiving the ultrasonic reflected from the object; a CPU(30) controlling the whole operation; and an alarm apparatus(40) outputting an alarm. The ultrasonic transmitting circuit part(10) comprises an ultrasonic transmitting clock part(11), an ultrasonic control signal part(12) and an ultrasonic transmitting sensor part(31).

Description

Vehicle collision prevention device and method using ultrasonic wave

1 is an exemplary view of the blind spot of the vehicle side back mirror.

2 is a block diagram of the present invention.

3 is a detailed block diagram of the ultrasonic transmitting circuit unit of the present invention.

4 is a detailed configuration diagram of the ultrasonic receiving circuit portion of the present invention.

5A to 5E are transmission signal timing diagrams of the present invention.

6 is an operational flowchart of the present invention.

* Explanation of symbols for main parts of the drawings

10: ultrasonic transmission circuit unit, 11: ultrasonic transmission clock unit,

12: ultrasonic control signal unit, 13: ultrasonic transmission sensor unit,

20: ultrasonic receiving circuit portion, 21: ultrasonic receiving sensor portion,

22: first amplifier, 23: band pass filter,

24: second amplifier, 25: detection circuit,

26: comparison circuit portion, 27: reference time operation circuit portion,

28: time comparison unit, 29: signal adjustment and processing unit,

30: central processing unit, 40: alarm unit.

The present invention relates to an apparatus and method for preventing a vehicle collision using ultrasonic waves, by attaching an ultrasonic sensor to a rear surface of a vehicle, and informing a driver of the distance detected by the ultrasonic sensor so as to assist the blind spot of the vehicle. In particular, the present invention relates to an apparatus and a method for changing the minimum detection distance of the present invention by varying the length of an ultrasonic transmission signal.

Accidents in automobiles are directly related to the generation of drivers and occupants, so car accidents are a serious problem behind the convenience of automobiles. Therefore, various safety equipments are being developed for automobile accidents, which are intended to save lives in the event of an accident. However, the risk of accidents can be reduced, but there is no function to prevent accidents.

In a conventional vehicle, side back mirrors are used on the left and right sides of the vehicle to determine the situation of the side and rear of the vehicle. In general, the side back mirror of the vehicle is the side when viewed from the driver's seat, as shown in FIG. Since there are blind spots that cannot be checked with the rearview mirror, drivers must turn their heads to check the blind spots in the case of lane changes. There was a problem in that the side back mirror was hard to see.

The present invention for solving the conventional problems as described above by attaching an ultrasonic transmitting sensor and a receiving sensor to the rear of the vehicle to inform the driver of the distance detected by the ultrasonic sensor to serve as a secondary role for the rear blind spot and In particular, by varying the length of the ultrasonic transmission signal characterized in that the minimum detection distance can be changed according to the situation.

In the case of a system in which the length of the ultrasonic transmitting signal is fixed, the minimum detection distance is fixed, but the present invention varies the length of the ultrasonic transmitting signal to match the position of the object so that the length of the ultrasonic transmitting signal is close to the object. By shortening the minimum detection distance and reducing the minimum detection distance when the object is far away, it increases the reliability of the detection by increasing the length of the outgoing signal even if the minimum detection distance is long to increase the detection area.

When described in detail with reference to the drawings as follows.

2 is a diagram showing the configuration of the present invention, which generates a clock to drive an ultrasonic wave and transmits an ultrasonic wave toward an object, and an ultrasonic transmitting circuit unit 10, receiving ultrasonic waves reflected on an object, and processing the received ultrasonic waves to the center. Ultrasonic receiving circuit unit 20 output to processing unit 30, central processing unit for controlling the entire operation of the ultrasonic transmitting circuit unit 10, ultrasonic receiving circuit unit 20 and the alarm device 40, and the central When the distance calculated by the processing device 30 is a dangerous distance, it is configured as an alarm device 40 for outputting an alarm.

As shown in FIG. 3, the ultrasonic transmitting circuit unit 10 includes an ultrasonic transmitting clock unit 11 for generating a clock for driving the ultrasonic wave, and an ultrasonic wave outputting a control signal for controlling the ultrasonic wave in a transmitting or standby state. The control signal unit 12 and the ultrasonic signal transmitting unit 13 for transmitting or waiting the clock generated by the ultrasonic signal transmitting unit 11 by the control signal of the ultrasonic control signal unit 12.

In addition, as illustrated in FIG. 4, the ultrasonic receiving circuit unit 20 includes an ultrasonic receiving sensor unit 21 and an ultrasonic receiving sensor unit which receive ultrasonic waves transmitted from the ultrasonic transmitting circuit unit 10 and reflected on an object. A first amplifier 22 for amplifying the received signal input at 21, a band pass filter 23 for removing noise of the signal amplified by the first amplifier 22, and the bandpass filter A second amplifier section 24 for amplifying the signal filtered by the section 23, a detection circuit section 25 for detecting a signal amplified by the second amplifier section 24 into a digital signal, and the detection circuit section 25 ) Operates only for a predetermined time by the comparison circuit unit 26 for comparing the detected signal with the ultrasonic control signal generated by the ultrasonic transmitting circuit 10 and outputting the ultrasonic control signal generated by the ultrasonic transmitting circuit 10. Reference time operation circuit for determining operation time (27), a time comparison unit 28 for comparing and outputting a signal output from the comparison circuit unit 26 with a time determined by the reference time operation circuit unit 27, and a comparison output from the time comparison unit 28. It consists of a signal adjusting / processing unit 29 for adjusting the voltage and the signal to process the signal.

(A) to (e) of FIG. 5 are the transmission signal timing diagrams of the present invention, (a) is an ultrasonic transmission clock, (b) is an ultrasonic control signal, (c) is an output signal of the ultrasonic transmission sensor, and (d) (e) shows the output signal of the ultrasonic transmitting sensor which adjusted the length, and FIG. 6 is an operation flowchart of the present invention.

The operation of the present invention will now be described with reference to FIGS. 5 and 6.

The ultrasonic transmission clock unit 11 of the transmission signal circuit unit 10 generates a periodic oscillation signal as shown in FIG. This oscillation signal oscillates at a certain frequency that matches the characteristics of the ultrasonic wave.

In an ultrasonic system that uses a return time after hitting an object to obtain a distance from the object, the oscillation signal cannot be directly applied to the ultrasonic oscillation sensor. This is because, when the ultrasonic wave is oscillated by the transmitting sensor, the ultrasonic signal propagating through the medium different from the air toward the ultrasonic receiving sensor is larger than the signal hitting and returning to the object.

For this reason, in general, a method of oscillating for a certain time and not oscillating for a certain time is often used. Therefore, the signal from the oscillation circuit is processed by a logical product with the signal controlled by the processor to generate a signal as shown in (c) of FIG. At this time, the ultrasonic transmission sensor 13 is oscillated during the time t1, and waits for the signal to return to the object during the time t2.

Here, t is the origination time, t2 is the time to wait until the outgoing signal is received, this time determines the detectable distance, this time is determined by the following equation (Equation 1) .

At this time, the movement speed of sound waves in the air is 340m / sec.

Therefore, the waiting time t2 is adjusted to fit the maximum detection distance.

In this case, the ultrasonic receiving circuit unit 20 uses the same signal as that of (b) of FIG. 5 generated by the ultrasonic control signal unit 12 of the ultrasonic transmitting signal unit 10 to make a basic signal for error elimination. Therefore, during the transmission time t1, the receiving end processes the signal received by the ultrasonic receiving circuit unit 20 to prevent the signal propagating directly from the transmitting end, and during this time, the object cannot be detected, so it is minimal to spread this time to a distance. Detection distance.

In addition, since the outgoing power is an area during the outgoing time t1, the longer the length of the t1, the greater the power capable of detecting a long distance object. That is, as shown in (d) of FIG. 5, if the output signal of the ultrasonic transmitting sensor is reduced by t3, the minimum detection distance by the distance corresponding to the time t3 is reduced, and when the length is increased as in (e) of t5, t4 The minimum detection distance increases by the corresponding distance, and the maximum detection distance increases. Thus, signal d is used when the object is near, and signal e is used when the object is far away.

By the combination of these signals, the ultrasonic wave is oscillated, and the signal from which the oscillated signal hits an object is returned. The signal processed by the ultrasonic receiving circuit unit 20 of FIG. 2 is input to the central processing unit 30 to determine the distance from the object. The measurement distance is determined by the following equation (Equation 2).

The reason for dividing by 2 in the above formula (Equation 2) is that the travel distance is actually a round trip distance.

6 is a flowchart illustrating an operation of the present invention, in which a first step S1 of checking whether an object is present; A second step (S2) of returning to the beginning by adjusting the length of the output signal of the ultrasonic transmitting sensor after determining that the object is too close or near the maximum detection distance after the first step is performed; After performing the first step S1, if there is an object, it is determined whether the distance change with the object is a certain width or more, and if there is no change in the distance, it returns to the beginning, and if there is a change, the third whether the distance is farther or not is determined. Step S3; After performing the third step S3, if the distance to the object becomes close, the fourth step of adjusting the length to the output signal of the ultrasonic transmitting sensor shortly and the length of the output signal of the ultrasonic sending sensor to be long after the distance is far away (S4) )Wow; A fifth step S5 of determining whether or not the distance to the object is less than or equal to the danger distance after performing the fourth step S4; After the fifth step S5, the alarm device is driven when the distance is less than the dangerous distance, and the operation is performed in the order of the sixth step S6 when the alarm device is more than the dangerous distance.

As described in detail above, the present invention monitors whether there is an object in the blind spot of the side back mirror while driving or parking a vehicle, thereby preventing a dangerous situation and also making it possible to vary the length of the ultrasonic transmission signal. It is effective to increase the reliability.

Claims (3)

In the apparatus for preventing automobile collision, an ultrasonic transmitting circuit unit 10 generating a clock to drive ultrasonic waves and transmitting ultrasonic waves toward an object, and receiving ultrasonic waves reflected on the object and processing the received ultrasonic waves to generate a clock. Ultrasonic receiving circuit unit 20 to output to the processing unit 30, the central processing unit 30 for controlling the entire operation of the ultrasonic transmitting circuit unit 10, the ultrasonic receiving circuit unit 20 and the alarm device 40, And an alarm device 40 configured to output an alarm when the distance calculated by the central processing unit 30 is a dangerous distance, wherein the ultrasonic transmission circuit unit 10 drives a clock to drive the ultrasonic wave. Ultrasonic outgoing clock unit for generating a 11 and the ultrasonic control signal unit 12 for outputting a control signal for the variable control alternately in the transmission and standby state of the ultrasonic wave, and the second The clock generated by the sound wave transmission clock unit 11 is configured by the ultrasonic signal transmitting unit 13 for outputting the clock when the transmission state by the control signal of the ultrasonic control signal unit 12 and the clock output when the standby state. Vehicle collision prevention apparatus using ultrasonic waves. The ultrasonic receiving circuit unit 20 of claim 1, wherein the ultrasonic receiving circuit unit 20 is input from the ultrasonic receiving sensor unit 21 and the ultrasonic receiving sensor unit 21 for receiving the ultrasonic wave transmitted from the ultrasonic transmitting circuit unit 10 to the object and reflected. The first amplifier 22 for amplifying the received signal, the band pass filter 23 for removing the noise of the signal amplified by the first amplifier 222, and the band pass filter 23 A second amplifier 24 for amplifying the filtered signal and a signal amplified by the detection circuit unit 25 for detecting a signal amplified by the second amplifier 24 to make a digital signal to make a digital signal. The circuit section 25, the comparison circuit section 26 for comparing the signal detected by the detection circuit section 25 with the ultrasonic control signal generated by the ultrasonic transmitting circuit 10, and the ultrasonic sending circuit 10 generated. Only during the predetermined time by the ultrasonic control signal A reference time operation circuit section 27 for determining an operation time, a time comparison section 28 for outputting a signal compared and output from the comparison circuit section 26 with a time determined by the reference time operation circuit section 27, and And a signal storage / processing unit (29) for adjusting a voltage and a circuit so as to process the signals output from the time comparison unit (28). A method of preventing a vehicle collision, comprising: a first step (S1) of checking whether an object is present; A second step (S2) of returning to the beginning by adjusting the length of the output signal of the ultrasonic transmitting sensor after determining that the object is too close or near the maximum detection distance after the first step; After performing the first step S1, if there is an object, it is determined whether the distance change with the object is a certain width or more, and if there is no change in the distance, it returns to the beginning, and if there is a change, the third whether the distance is farther or not is determined. Step S3; After performing the third step S3, if the distance to the object becomes close, the length is shortened to the output signal of the ultrasonic transmitter. )Wow; A fifth step (S5) of determining whether or not the distance to the object is less than or equal to the danger distance after performing the fourth step (S4); After performing the fifth step (S5), if the distance is less than the dangerous distance to drive the alarm device, if the danger is over, the vehicle collision prevention using ultrasonic waves, characterized in that the operation in the order of the sixth step (S6). Way.