KR20060003966A - Apparatus and method for detecting a hindrance of the rear field of cars by using electro-magnetic field - Google Patents

Abstract

The present invention relates to an apparatus and method for detecting a rear obstacle for a vehicle using an electromagnetic field, comprising: a transmission / reception antenna attached to a rear bumper of a vehicle; If an obstacle is detected in the vehicle when reversing, the signal is received from the transmit / receive antenna to change the frequency or wavelength according to the obstacle position at the rear of the vehicle. / 2f, 1 / 4f) and bumper external frequency (1f, 2f, 4f) real-time monitoring to change the frequency or width of the pre-warning zone, warning zone, 1, 2, 4 times more than the initial reference value, A system module for controlling, judging, and generating an alarm sound according to a field region of a collision zone; And a buzzer for generating different alarm sounds according to the field area where the obstacle is detected. Therefore, when the vehicle is reversed or parked, obstacles are detected according to the zone in which the electromagnetic field behind the vehicle is formed, thereby generating different alarm sounds, thereby preventing contact accidents.

Vehicle, rear, obstacle, detection

Description

Apparatus and method for detecting a hindrance of the rear field of cars by using electro-magnetic field}             

Figure 1a is a block diagram of a rear obstacle detection and display device of a conventional vehicle.

Figure 1b is a view showing the installation position of the ultrasonic sensor for detecting the rear obstacle of the vehicle of Figure 1a.

2 is a conceptual diagram of a rear obstacle detecting device for a vehicle using an electromagnetic field according to the present invention;

3A is a structural diagram of a transmit / receive antenna module attached to the rear of the vehicle of FIG. 2.

Figure 3b is a view illustrating a transmission and reception antenna PCB radiation pattern structure of a symmetrical structure with different hole sizes.

Figure 3c is a circuit diagram connected to the transceiver antenna module and the oscillator / counter IC of the PCB radiation pattern structure in the system module.

Figure 4 is a block diagram of a vehicle rear obstacle detection device using an electromagnetic field according to the present invention.

5 is a flowchart illustrating a method for detecting a rear obstacle for a vehicle using an electromagnetic field according to the present invention.

<Explanation of symbols for the main parts of the drawings>

10: transmit and receive antenna 20: system module

21: transmit and receive antenna module of PCB radiation pattern structure

22: Oscillator or Counter IC 23: Oscillator Circuit (10MHz)

24: microcomputer controller 25: power supply

26: ground (GND) 30: buzzer

100: car

The present invention relates to an apparatus and a control method for a rear obstacle for a vehicle using an electromagnetic field. In particular, when an obstacle is detected at the rear of the vehicle during backward driving using the principle of the electromagnetic field by mounting a transmitting / receiving antenna at the rear of the vehicle, the wavelength and frequency of the electromagnetic field are changed. Pre-Warning Zone, Warning Zone, Collision Zone in the area where the frequency change width or wavelength width is 1, 2, or 4 times higher than the initial reference value by counting the frequency according to the obstacle position and monitoring the frequency change inside and outside the bumper in real time. The present invention relates to an apparatus and method for detecting a rear obstacle for a vehicle using an electromagnetic field to generate different alarm sounds to prevent contact accidents.                         

In general, the rear obstacle detection and display device of a conventional vehicle operates an ultrasonic sensor installed at the rear of the vehicle to detect an obstacle behind the vehicle when the vehicle is retracted or parked, and emits ultrasonic waves and receives the reflected ultrasonic waves to prevent the rear obstacles. When the obstacle approaches within a certain distance by judging the approach direction and the approach distance of the driver, obstacle indication means and alarm sound are generated to alert the driver and used to prevent various accidents.

Referring to FIG. 1A, the rear obstacle detection and display device of the conventional vehicle may detect the obstacles on the left and right sides of the rear of the vehicle, respectively, as shown in FIG. 1B, in which the ultrasonic sensor for rear obstacle detection is installed. A plurality of ultrasonic sensors 10 installed at a rear edge of the vehicle and including a first ultrasonic sensor installed at the rear left corner of the vehicle body and a second ultrasonic sensor installed at the rear right corner of the vehicle body; and obstacle detection of the first ultrasonic sensor A plurality of light emitting elements (21 to 27) installed in the room mirror 20 and the second light emitting element for indicating whether the first light emitting device for indicating whether or not the obstacle detection of the second ultrasonic sensor and the operation start means ( 30 and control means 40.

The plurality of ultrasonic sensors 10 are configured to emit a predetermined ultrasonic wave to check traffic information behind the vehicle to detect an approaching obstacle and output a signal corresponding thereto, and the plurality of light emitting elements 21 to 27 Installed in the vehicle's room mirror 20 and configured to display traffic information on obstacles of the rear road, which are recognized by the plurality of ultrasonic sensors 10 according to predetermined control signals, respectively.

The operation start means 30 is configured to receive a command to start the operation of the ultrasonic sensor 10 and output an operation start signal corresponding thereto. That is, the operation start means 30 is to prevent the ultrasonic sensor 10 from being unnecessarily operated while driving the vehicle, thereby preventing the driver from being confused. When the driver desires, that is, the predetermined switch of the operation start means 30 is activated. It is preferable that the ultrasonic sensor 10 operates only when turned on.

The control means 40 oscillates the ultrasonic wave according to the operation start command of the operation start means 30, and after the signal processing the ultrasonic waves transmitted and received from the plurality of ultrasonic sensors 10, the presence or absence of a moving object approaching Determination of the approach direction and the approach distance of the obstacle, and outputs a control signal corresponding to the control of the operation of the plurality of light emitting elements (21 to 27), respectively. That is, the control means 40 controls the plurality of ultrasonic sensors 10 to transmit predetermined ultrasonic waves at predetermined time intervals, and the first ultrasonic waves transmitted from the plurality of ultrasonic sensors 10 are reflected on the moving object and received. After storing the time, the time when the second transmitted ultrasonic wave is reflected by the moving object and calculated is compared with the reception time of the reflected wave stored in the first time, and the presence and distance of the moving object being approached can be known. In addition, if the presence or absence of the output signals of the plurality of ultrasonic sensors 11 and 15 is checked, the appearance direction of the approaching obstacle (left or right rear) can be easily known.

That is, when an obstacle is detected by the first ultrasonic sensor 11 installed on the rear left side of the vehicle, the light emitting element 23 installed on the left side of the room mirror 20 blinks according to a predetermined control signal, and the first ultrasonic sensor If no obstacle is detected in (11), another light emitting element 21 installed on the left side of the room mirror 20 blinks. In order to make it easy for a driver to know whether the obstacles are present, the emission light of the plurality of light emitting devices 21 and 23 may be implemented differently. For example, when an obstacle appears behind the vehicle, the red light emitting device 23 may be used. Flashes and the blue light emitting element 21 blinks in a good state in which no obstacle appears.

In addition, when an obstacle is detected by the second ultrasonic sensor 15 installed on the rear right side of the vehicle, the light emitting device 27 installed on the right side of the room mirror 20 blinks according to a predetermined control signal, and the second ultrasonic sensor If no obstacle is detected at 15, another light emitting element 25 installed on the right side of the room mirror 20 blinks. It is preferable to implement the emission light of the plurality of light emitting devices 25 and 27 differently so that a driver can easily know whether the obstacle appears. For example, when the obstacle appears, the red light emitting device 27 When the light is flickering and in a good state in which no obstacle appears, the blue light emitting element 25 is flickered. Accordingly, by installing the plurality of light emitting elements 21 to 27 in the room mirror 20 of the vehicle, the driver always keeps an eye on the room mirror 20 when the lane is changed during driving or when the vehicle is backed up. It is easy to recognize rear traffic information.

However, the vehicle rear obstacle detection and parking assistance system using the conventional ultrasonic sensor is widely used and widely used, and the performance or detection area is different for each implementation method, and many problems are also included (ex. When you are near (30 cm or less), enter the parking lot from close range).

Therefore, there is a problem in that the excitation time must be efficiently controlled and the inconvenience of having to make a hole in the rear bumper of the vehicle because the distance detected according to the excitation time of the ultrasonic sensor differs from 10 cm to 20 cm. There is a problem that often malfunctions, foreign matter, vehicle noise.

The present invention has been proposed to solve the problems of the prior art, and an object of the present invention is to mount a transmission and reception antenna on the rear of the vehicle to change the wavelength and frequency of the electromagnetic field when an obstacle is detected at the rear of the vehicle during the reverse using the principle of the electromagnetic field. Counting the frequency according to the position of obstacles at the rear of the vehicle and monitoring the frequency change inside the bumper and the outside frequency of the bumper in real time, so that the frequency change width or the wavelength width is 1, 2, 4 times higher than the initial reference value respectively. It is to provide a rear obstacle detection device for a vehicle using an electromagnetic field to set a warning zone, warning zone and collision zone to generate different alarm sounds according to the obstacle detection area behind the vehicle to prevent contact accidents.

Another object of the present invention is to provide a method for controlling a rear obstacle detecting apparatus for a vehicle using an electromagnetic field which is particularly suitable for performing the rear obstacle detecting apparatus for a vehicle.

In order to achieve the above object of the present invention, the present invention provides a vehicle rear obstacle detection system comprising: a transmission and reception antenna (10) attached to a vehicle rear bumper for detecting an obstacle behind the vehicle using the principle of the electromagnetic field; When the obstacle is detected at the rear of the vehicle when the vehicle is reversed, it receives a signal from which the frequency or wavelength of the obstacle is changed from the transmission / reception antenna 10 to the rear of the vehicle, filters the noise, and counts the frequency according to the obstacle position at the rear of the vehicle. Real-time monitoring of changes in the frequency (1f, 1 / 2f, 1 / 4f) inside the bumper and the frequency (1f, 2f, 4f) outside the bumper, so that the frequency change width or wavelength width is 1, 2, or A system module 20 for controlling, determining, and generating an alarm sound according to a field area in which the obstacle is detected by setting a pre-warning zone, a warning zone, and a collision zone in a region of four times or more; And a buzzer 30 for generating the different alarm sounds according to the field region in which the obstacle is sensed.

In order to achieve the another object of the present invention, the present invention provides a vehicle rear obstacle detection device using an electromagnetic field, comprising a transmit and receive antenna module having a PCB radiation pattern structure connected to the transmission and reception antenna attached to the vehicle rear bumper in a connecting ring structure After the microcomputer initialization (S1) and the system initialization (S2) in the system module, by checking the self-diagnosis (Self Diagnosis) of the system module, if it is bad, generates a system fail alarm and the system is disabled (S4-S5); Generating a normal sound when the self-diagnosis is normal (S6), receiving data from the transmit / receive antenna (S7), measuring a frequency (S8), and setting an initial reference value (S9); A main routine of the microcomputer of the system module is operated (S10) to receive and transmit / receive antenna module data from the transmit / receive antenna module 21 of the PCB radiation pattern structure (S11) and measure a frequency (S12); By comparing an initial reference frequency and a measured frequency (a), an obstacle is detected in a zone where an electromagnetic field is formed in the rear of the vehicle, and there is no alarm when there is no obstacle, and a frequency change width or wavelength when the obstacle exists. Set Pre-Warning Zone, Warning Zone, Collision Zone in the area where width is more than 1 times, 2 times, 4 times more than the initial reference value, and the alarm sound is generated through the buzzer according to the microcomputer control according to the field area where obstacles are detected. Frequency comparison and obstacle detection step; And detecting an obstacle behind the vehicle by repeatedly performing the main routine of the microcomputer at a predetermined waiting time period.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a conceptual view illustrating a rear obstacle detecting apparatus for a vehicle using an electromagnetic field according to the present invention.

A system module 20 including a vehicle rear bumper attachable / adhesive transmit / receive antenna 10, a transmit / receive antenna module 21 having a PCB radiation pattern structure having a connecting ring structure, and an buzzer 30 are equipped with an electromagnetic field when reversing. When an obstacle is detected at the rear of the vehicle in the zone to be formed, the frequency is increased and the wavelength is shortened. The physics principle is used to control the system module 20 to count the frequency according to the position of the obstacle at the rear of the vehicle. Real-time monitoring of changes in frequency (1f, 1 / 2f, 1 / 4f) and frequencies outside the bumper (1f, 2f, 4f) allows the frequency change or wavelength width of the electromagnetic field to be 1, 2, or By setting Pre-Warning Zone, Warning Zone, Collision Zone in area more than 4 times, different alarm sounds (continuous sound, 4Hz, 8Hz) through buzzer 30 according to detected field zone By generating It is a device to induce the driver's attention to prevent contact accidents with obstacles behind the vehicle.

Referring to FIG. 4, a rear obstacle detecting apparatus for a vehicle using an electromagnetic field according to the present invention includes a transmission / reception antenna 10 installed in a vehicle rear bumper to detect an obstacle behind the vehicle using the principle of the electromagnetic field; When the obstacle is detected in the zone where the electromagnetic field is formed in the rear of the vehicle during the reverse frequency, the frequency is increased and the wavelength is shortened. Noise Filtering counts the frequency according to the obstacle position behind the vehicle and monitors the frequency (1f, 1 / 2f, 1 / 4f) inside the bumper and the frequency (1f, 2f, 4f) outside the bumper in real time to change the frequency range. Alternatively, control, judgment, and alarm sound can be generated according to the field zones of pre-warning zone, warning zone, and collision zone in areas where the wavelength width is 1, 2, 4 times or more of the initial reference. A system module 20 for controlling; And a buzzer 30 that generates different alarm sounds (eg, continuous sound, 4 Hz, 8 Hz) according to the three field areas in which a vehicle rear obstacle is detected under the control of the system module 20. .

At this time, when the system module 20 is first turned on, a wavelength is recognized from the transceiving antenna 10 attached to the rear bumper of the vehicle to detect an obstacle behind the vehicle according to the change of the wavelength.

The system module 20 is connected to the rear bumper attachment / adhesive transmission / reception antenna 10 of the vehicle in a linkage structure, and transmits / receives electromagnetic waves smoothly to the transmission / reception antenna 10 in a rear field area of the vehicle. It is formed of a geometric PCB radiation pattern structure connected in a symmetrical structure with different hole sizes to form the field zone, and when the obstacle is detected at the rear of the vehicle, the frequency according to the position of the obstacle from the transmission / reception antenna 10. Alternatively, noise is filtered through the transmit / receive antenna module 21 having the PCB radiation pattern structure and the transmit / receive antenna module 21 having the PCB radiation pattern structure to receive the signal whose wavelength is changed, thereby inputting the frequency or wavelength signal from which the noise is removed. The real time by counting the frequency according to the position of the obstacle in the rear field of the electromagnetic vehicle in real time An oscillator or counter IC 22 providing a frequency varied signal; An oscillation circuit (10 MHz) 23 providing a constant oscillation frequency; Real-time monitoring of the frequency (1f, 1 / 2f, 1 / 4f) inside the bumper and the frequency (1f, 2f, 4f) outside the bumper by receiving the real-time frequency changed signal from the oscillator or counter IC 22 Thus, different alarms are generated according to field areas where obstacles of a pre-warning zone, a warning zone, and a collision zone are detected in an area where the frequency change width or the wavelength width is more than 1, 2, and 4 times the initial reference value (Reference). A microcomputer controller 24 for generating sound, a power supply unit 25 for supplying predetermined powers 12v and 5v to the system module 20, and the system module 20 for ground (GND). And a ground portion 26.

The core of the present invention is a transmit / receive antenna module design, in which a copper wire flowing current in a film type is formed in a PCB radiation pattern structure as shown in FIG. 3A to design a tape that can be attached to a rear bumper of a vehicle.                     

Referring to FIG. 3A, the transmit / receive antenna 10 module structure attached to the rear bumper of the vehicle is formed using a film type aluminum material or a copper material, and has a film shape having a geometric pattern of the connection ring structure of FIG. 3B. Bumper-attached or self-adhesive antenna structure with insulator and metal body of the rear bumper connected with copper wires.

Referring to FIG. 3B, the transmit / receive antenna module 21 having a PCB radiation pattern structure in the system module 20 has a PCB radiation pattern structure of a transmit / receive antenna having a symmetrical structure having different hole sizes, and the rear bumper side of the vehicle. Since it has a geometric PCB radiation pattern structure connected to the transmit / receive antenna 10 and connected in symmetrical structures with different hole sizes, it is possible to smoothly transmit and receive the Near Field region of electromagnetic waves.

The left side is soldered to a plurality of holes smaller than the reference value so that the magnetic field is formed tightly on the left side to form a field zone at the rear of the vehicle to transmit and receive electromagnetic waves to and from the transmission antenna 10 and the right side is larger than the reference value so that the sparse magnetic field is formed. It is soldered to many holes.

3C is a circuit diagram in which a transceiver antenna module having a PCB radiation pattern structure in the system module 20 and an oscillator / counter IC 22 are connected.

As shown in FIG. 3C, the transmit / receive antenna 10 is connected to a transmit / receive antenna module 21 having a PCB radiation pattern structure in the system module 20 in a link ring structure, and within the system module 20. The transmit / receive antenna module 21 having a PCB radiation pattern structure connected to the transmit / receive antenna 10 sends a real-time frequency change to the microcomputer controller 20 using an oscillator and a counter IC. The microcomputer controller 20 counts the frequency according to the position of the obstacle in the rear field of the vehicle in the zone where the electromagnetic field is physically formed using the frequency change, for example, a frequency inside the bumper, for example, 1 / f, 1. Real-time monitoring of changes in frequencies 1f, 2f, and 4f outside of the bumper (2f, 1 / 4f) and bumper (actual frequency should extract data from the experiment), so that the frequency change width or wavelength width is referred to the initial reference value (hereinafter referred to as Reference). Different alarm sounds (e.g. continuous sound, 4Hz, 8Hz) are generated according to Pre-Warning Zone, Collision Zone, and Warning Zone in the area of 1, 2, 4 times or more.

5 is a flowchart illustrating a method for detecting a rear obstacle for a vehicle using an electromagnetic field according to the present invention with reference to FIG. 5.

In the apparatus for detecting a vehicle rear obstacle using an electromagnetic field, the system module 20 including a transmit / receive antenna module 21 having a PCB radiation pattern structure connected in a linkage structure with the transmit / receive antenna 10 attached to the vehicle rear bumper. After the microcomputer initialization (step S1) and system initialization (step S2), the self-diagnosis is checked and if it is bad (Self Diagnosis Fail) (step S3), a system fail alarm is generated (step S4) and the system module is stopped ( System Disabled) (Step S5).

If the self-diagnosis of the system module 20 is normal, a normal sound is generated (step S6), data is received from the transmit / receive antenna 10 attached to the rear bumper of the vehicle (step S7), and the frequency is measured (step S8). After setting the initial reference value (Initial Reference setting) (step S9), the main routine of the microcomputer of the system module 20 is operated (step S10) to transmit / receive the antenna module from the transmit / receive antenna module 21 of the PCB radiation pattern structure. The data is received (step S11) and the frequency a is measured (step S12).

When the reference frequency is compared with the measured frequency (a), if Reference <a condition (step S13), there is no obstacle in the zone where an electromagnetic field is formed in the rear of the vehicle, so that no alarm sounds (No Sound). S14),

When a ≤ Reference ≤ 2a condition, an obstacle detected at the rear of the vehicle is detected in the pre-warning zone to generate a corresponding alarm sound through the buzzer 30 under the control of the microcomputer controller 24 (steps S15 and S16),

If the condition 2a <Reference ≤ 4a, an obstacle detected at the rear of the vehicle is detected in the warning zone to generate a corresponding alarm sound (steps S17 and S18).

If the reference> 4a condition, the obstacle detected in the rear of the vehicle is detected in the Collision Zone to generate a corresponding alarm sound (step S19), and then check whether a predetermined waiting time (50msec) has elapsed (step S20). 50msec) repeatedly detects an obstacle behind the vehicle by repeating the main routine of the microcomputer.

In detail, in order to maximize the area of the electromagnetic field behind the vehicle, the rear of the vehicle is formed in a zone (Near Field) in which an electromagnetic field is induced from the transmission / reception antenna 10 to the transmission / reception antenna module 21 of the geometric PCB radiation pattern structure. As the obstacle approaches, the frequency is increased and the wavelength is shortened to detect the position of the obstacle. The exact distance cannot be calculated, but the frequency change according to the obstacle position can be calculated with the statistically extracted data from the experiment. However, in the obstacle detection method behind the vehicle using the electromagnetic field according to the present invention, since the frequencies are different according to the environmental conditions of the vehicle, the initial data is used as the initial reference value, and the distance is calculated according to the change width thereof. Minimize the problems caused by (RV, passenger car, van). However, the problem caused by this factor is not an accurate distance calculation like ultrasonic / radar, so it can be used as a convenience device in the after market. In addition, in the case of vehicle fixing and object fixing, the Doppler effect method is used, so that detection is impossible. However, there are many advantages because the sensing distance caused by the aftershock, which is a problem in the ultrasonic wave, is less than 30cm, and there is no malfunction in the environment for fog, snow, and rain, and holes are not drilled in the bumper.

As described above, although described with reference to a preferred embodiment of the present invention, those skilled in the art various modifications of the present invention without departing from the spirit and scope of the invention described in the claims below Or it may be modified.

As described above, the vehicle rear obstacle detection apparatus and method using an electromagnetic field according to the present invention is equipped with a transmission and reception antenna on the rear of the vehicle by using the principle of the electromagnetic field when an obstacle is detected in the zone where the electromagnetic field is formed in the rear of the vehicle when the reverse The frequency and frequency of the vehicle are changed, and the frequency according to the obstacle position is counted at the rear of the vehicle, and the frequency change inside and outside the bumper is monitored in real time, so that the frequency change width or wavelength width is 1, 2, 4 times or more of the initial reference value. By setting Pre-Warning Zone, Warning Zone and Collision Zone, different warning sounds are generated according to the area where obstacles behind the vehicle are detected to alert the driver to prevent various accidents caused when the vehicle is backed up or parked. It can work.

Claims (5)

In the vehicle rear obstacle detection system: A transmission / reception antenna 10 attached to the vehicle rear bumper for detecting an obstacle behind the vehicle using the principle of the electromagnetic field; When the obstacle is detected at the rear of the vehicle when the vehicle is reversed, the signal is transmitted from the transmit / receive antenna 10 according to the position of the obstacle at the rear of the vehicle to filter the noise, count the frequency according to the position of the obstacle at the rear of the vehicle, and bumper Real-time monitoring of changes in internal frequencies (1f, 1 / 2f, 1 / 4f) and external frequencies (1f, 2f, 4f) outside the bumper, so that the frequency change width or wavelength width is 1, 2, or 4 times the initial reference A system module 20 for controlling, determining, and generating an alarm sound according to a field area in which the obstacle is detected by setting a pre-warning zone, a warning zone, and a collision zone in a region of more than twice; And Rear obstacle detecting apparatus for a vehicle using an electromagnetic field, characterized in that the buzzer (30) for generating the different alarm sound according to the field area where the obstacle is detected. The method of claim 1, The transmission and reception antenna 10 is formed using a film-type aluminum element or a film-type copper material to form a geometric PCB radiation pattern of a link ring structure to connect a copper wire through which current flows in the film form. Rear obstacle detecting device for a vehicle using an electromagnetic field, characterized in that formed of a bumper attached or adhesive antenna structure having insulation with the metal of the bumper. The method of claim 1, The system module 20 The field zone is connected to the transmission / reception antenna 10 attached to the rear bumper of the vehicle, and the field zone is formed in the transmission / reception antenna 10 to smoothly transmit and receive electromagnetic waves in the rear field area of the vehicle. For the purpose of the present invention, it is formed of a geometric PCB radiation pattern structure connected to each other in a symmetrical structure with different hole sizes. Transmitting and receiving antenna module 21 of the PCB radiation pattern structure; Noise is filtered through the transmit / receive antenna module 21 of the PCB radiation pattern structure and the frequency or wavelength signal from which the noise is removed is input according to the position of the obstacle in the rear field (Near Field) in which an electromagnetic field is formed in real time. An oscillator or counter IC 22 for counting and providing a real-time frequency changed signal; An oscillation circuit (10 MHz) 23 providing a constant oscillation frequency; Real-time monitoring of the frequency (1f, 1 / 2f, 1 / 4f) inside the bumper and the frequency (1f, 2f, 4f) outside the bumper by receiving the real-time frequency changed signal from the oscillator or counter IC 22 Therefore, in the area where the frequency change width or the wavelength width is 1, 2, 4 times or more with respect to the initial reference value (Reference), different depending on the field area where the obstacle of the pre-warning zone, warning zone, collision zone is detected A microcomputer controller 24 controlling to generate an alarm sound; A power supply unit 25 supplying predetermined power to the system module 20; And Rear obstacle detecting apparatus for a vehicle using an electromagnetic field, characterized in that the system module (20) is composed of a ground portion 26 for ground (GND). In the vehicle rear obstacle detection method using an electromagnetic field, Self Diagnosis of the System Module after Initialization (S1) and System Initialization (S2) in the System Module Including a Transmitting and Receiving Antenna Module of PCB Radiation Pattern Structure Connected to the Transceiver Antenna Attached to the Rear Bumper of the Vehicle Check and if it is bad, generate a system fail alarm and the system is disabled (S4-S5); Generating a normal sound when the self-diagnosis is normal (S6), receiving data from the transmit / receive antenna (S7), measuring a frequency (S8), and setting an initial reference value (S9); A main routine of the microcomputer of the system module is operated (S10) to receive and transmit / receive antenna module data from the transmit / receive antenna module 21 of the PCB radiation pattern structure (S11) and measure a frequency (S12); By comparing an initial reference frequency and a measured frequency (a), an obstacle is detected in a zone where an electromagnetic field is formed in the rear of the vehicle, and there is no alarm when there is no obstacle, and a frequency change width or wavelength when the obstacle exists. Frequency comparison and obstacle detection that generate corresponding alarm sound through buzzer according to micom control according to the field area of Pre-Warning Zone, Warning Zone, Collision Zone in the area where width is 1, 2, 4 times or more of initial reference value step; And A method for detecting a rear obstacle for a vehicle using an electromagnetic field, comprising: repeatedly performing a main routine of the microcomputer at a predetermined waiting time period to detect an obstacle behind the vehicle. The method of claim 4, wherein The frequency comparison and obstacle detection step Comparing the reference frequency and the measured frequency (a), there is no obstacle in the zone where the electromagnetic field behind the vehicle is formed under Reference <a condition (S13) (No Sound) (S14). ); When a ≤ Reference ≤ 2a condition, the obstacle detected in the rear of the vehicle is detected in the Pre-Warning Zone to generate a corresponding alarm sound through the buzzer under the control of the microcomputer (S15, S16); If the condition 2a <Reference ≤ 4a, an obstacle detected at the rear of the vehicle is detected at the Warning Zone to generate a corresponding alarm sound (S17, S18); And If the reference> 4a condition, the obstacle detected in the rear of the vehicle is detected in the Collision Zone to generate a corresponding alarm sound (S19) characterized in that the vehicle rear obstacle detection method using an electromagnetic field.

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