KR20030010891A - A system for back warning of automobil - Google Patents

Abstract

The present invention relates to a rear monitoring device for a vehicle, which is driven by a rear signal input when the vehicle is retracted, calculates a separation distance from an obstacle or a person located in a traveling direction, and generates a warning sound when the distance is smaller than the first distance, while the digital distance A rear warning unit for outputting a signal, a rear sensing unit for outputting the backward signal and the distance signal output from the rear warning unit to a central processing unit (CPU), and installed at the rear of the vehicle and operated by the reverse signal A digital image is obtained by mixing a camera that generates a video signal in an analog state by photographing the rear of the vehicle, a decoder for converting the video signal to a digital state, a video signal in the digital state, and a distance signal in the digital state. A mixing unit for outputting a video signal and the composite video signal of the digital state in the analog state It receives the encoder, and a composite video signal of the analog condition of converting includes a monitor that displays to be overlapped a distance of the obstacle or person on the screen of the motor vehicle rear state. Therefore, a distance or distance from an obstacle or a person can be simultaneously displayed on the screen indicating the rear situation of the car on the monitor by numbers or graphics, thereby reducing an accident due to a collision.

Description

A system for back warning of automobil

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for monitoring the rear of a vehicle when moving backwards, and more particularly, to a vehicle rear monitoring apparatus capable of simultaneously displaying, on a monitor, situation information captured by a camera installed at the rear of a vehicle and distance information between obstacles.

In general, a driver driving a vehicle reaches and parks a destination by maneuvering the vehicle while sitting in the driver's seat by moving forward, adjusting left and right, and reversing. In order to drive and park the vehicle to the destination, the driver must operate the vehicle while looking at the left, right, and rear sides as well as the front.

In addition, there are many vehicles that operate due to an increase in the penetration rate of automobiles, and in recent years, serious monitoring is required in front of, behind, left, and right. In particular, there is a greater demand for the monitoring and attention of the rear of the vehicle during reverse travel and parking reverse of the vehicle.

In general, the rear rearview mirror and the inner room mirror of the driver's left and right are used for rear monitoring of the vehicle. However, the direction in which the driver can monitor the rear of the vehicle through the left and right outer back and inner room mirrors is limited and there are blind spots not visible. Therefore, if the clock behind the vehicle is not secured when the vehicle is reversed and parked, and there is a person or an obstacle behind the vehicle, an accident may occur that injuries or breaks the vehicle.

Therefore, a method for monitoring the rear of the vehicle has been developed by determining the presence or absence of an obstacle by transmitting ultrasonic waves toward the blind spot behind the vehicle and detecting the reflection.

However, this method is inconvenient because it is not possible to determine only the presence of obstacles in the blind spot behind the vehicle and confirm the exact situation behind.

In addition, a method has been developed in which a camera is installed at the rear of an automobile to capture a situation behind the vehicle, and the captured image is displayed on a monitor installed inside the vehicle, thereby visually confirming the situation behind the vehicle.

However, this method also has a problem in that the separation distance from the obstacle is differently displayed on the screen due to the characteristics of the camera.

Accordingly, it is an object of the present invention to provide a vehicle rear monitoring apparatus capable of simultaneously displaying an accurate separation distance from an obstacle on a screen on a monitor displaying a situation behind the vehicle.

Vehicle rear monitoring apparatus according to the present invention for achieving the above object is driven by a rear signal input when the vehicle is reversed to generate a warning sound when the distance is less than the first distance by calculating the separation distance with the obstacle or person located in the traveling direction And a rear warning unit for outputting a distance signal in a digital state, a rear sensing unit for outputting the reverse signal and the distance signal output from the rear warning unit to a central processing unit (CPU), and installed at the rear of the vehicle, A camera which is operated by a signal to capture an image of the rear of the vehicle to generate an analog video signal, a decoder that converts the video signal into a digital state, a video signal in the digital state, and a distance signal in the digital state A mixing unit for outputting a composite video signal in a digital state, and the composite video scene in the digital state. An encoder for converting a call into an analog state, and a monitor for receiving the composite video signal of the analog state to superimpose the separation distance of the obstacle or the person on the screen of the vehicle rear state.

The rear warning unit preferably generates a warning sound whenever the distance between the obstacle or the person becomes a second and a third distance smaller than the first distance.

Preferably, the first, second and third distances are 120 cm, 80 cm and 40 cm, respectively.

Preferably, when the monitor is in the 'off' state before the vehicle reverse, the 'on' state is controlled by the CPU.

1 is a block diagram of a vehicle rear monitoring apparatus according to the present invention.

Explanation of symbols on the main parts of the drawings

11: CPU13: rear warning part

15: rear sensing unit 17: camera

19 decoder 21 mixing part

23 encoder 25 monitor

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

1 is a block diagram of a vehicle rear monitoring apparatus according to the present invention.

The vehicle rear monitoring apparatus according to the present invention includes a CPU (Central Processing Unit) 11, a rear warning unit 13, a rear detection unit 15, a camera 17, a decoder 19, a mixing unit 21, an encoder ( 23) and monitor 25.

In the above, the rear warning unit 13 calculates the separation distance when there is an obstacle or a person at the rear during the reverse driving and parking of the vehicle, and when the separation distance is smaller than the first distance, for example, 120 cm. Beep sounds. That is, when the shift gear is moved to the "reverse (R)" position during the reverse driving and parking of the vehicle, power is applied to the reverse lamp, that is, the reverse signal is detected and the ultrasonic or laser signals are transmitted in the driving direction, and the obstacle or Receives what is reflected by the person and calculates the distance from the obstacle or person by the time difference between the transmission and reception of the signal.

The rear warning unit 13 determines that there is an obstacle or a person by recognizing only the signal reflected within the first distance without recognizing the signal reflected outside the first distance even when the reflected signal is received. When the rear warning unit 13 determines that there is an obstacle or a person within the first distance, the rear warning unit 13 outputs a signal for the separation distance in a digital state while generating a warning sound.

In the above, the rear warning part 13 may generate a warning sound whenever the distance between the obstacle or the person becomes the second and third distances smaller than the first distance, for example, 80 cm and 40 cm.

The rear sensing unit 15 transmits a backward signal generated when the shift gear is moved to the 'reverse (R)' position and a distance signal output from the rear warning unit 13 to the CPU 11.

The CPU 11 outputs the reverse signal to the camera 17 and outputs the distance signal in the digital state to the mixing unit 21. In addition, the CPU 11 outputs the reverse signal to the monitor 25 so that the monitor 25 is in the 'on' state even when the monitor 25 is in the 'off' state.

The camera 17 is driven by a backward signal output from the CPU 11 to capture the rear of the vehicle and is formed of a CCD (Charge Coupled Device) camera and installed at the rear of the vehicle. The camera 17 is in an 'off' state when the vehicle is not started or when driving straight, but is driven by a reverse signal to be in an 'on' state. The video signal picked up by the camera 17 is an analog signal.

A decoder 19 converts the captured image signal from the analog state to the digital state. Since the video signal is converted into the digital state, the processing speed is increased, and the digital signal can be mixed with the distance signal in the digital state.

The mixer 21 mixes the distance signal output from the CPU 11 and the video signal output from the decoder 19 and outputs a composite video signal in a digital state. Since the distance signal output from the CPU 11 and the video signal output from the decoder 19 are each in a digital state, mixing is possible.

An encoder 23 converts a composite video signal in a digital state, in which a distance signal and a video signal are mixed, into an analog state.

The monitor 25 receives a composite video signal of an analog state photographing a rear state of the vehicle transmitted from the encoder 23 and displays it on the screen. At this time, the monitor 25 displays an overlapping distance of an obstacle or a person, which may be displayed numerically or graphically, together with an image screen indicating the rear of the vehicle by the composite image signal mixed with the image signal and the distance signal. Therefore, while visually confirming the rear situation of the vehicle by the screen displayed on the monitor 25, the distance between the obstacle or the person can be accurately known, and an accident such as a collision can be reduced.

The monitor 25 may be in an 'on' state or an 'off' state before the vehicle reverses. Even when the monitor 25 is in the 'off' state before the vehicle reverses, when the shifting gear is moved to the 'reverse (R)' position and a reverse signal is input, the 'on' state is controlled by the control of the CPU 11. The rear state of the vehicle is displayed by the input video signal.

The operation of the vehicle rear monitoring device having the above-described configuration will be described.

When the shift gear is moved to the "reverse (R)" position during the reverse driving and parking of the vehicle, the reverse lamp is turned on when the power is applied. At this time, the rear warning unit 13 detects the reverse signal from the power applied to the reverse lamp and transmits a signal such as an ultrasonic wave or a laser in the driving direction and receives the signal reflected by an obstacle or a person to receive and transmit the signal. Calculate the distance from obstacles or people by time difference.

In the above, the rear warning unit 13 determines that there is no obstacle or a person because the received signal is not reflected outside the first distance 120 cm. However, the rear warning unit 13 recognizes the signal reflected within the first distance, determines that there is an obstacle or a person, and generates a warning sound while outputting a distance signal in a digital state. In addition, the rear warning part 13 generates a warning sound whenever the distance between the obstacle or the person becomes the second and third distances smaller than the first distance, for example, 80 cm and 40 cm.

The distance signal in the digital state output from the rear warning unit 13 is transmitted to the CPU 11 through the rear sensing unit 15. In addition, the backward signal generated when the shift gear is moved to the 'reverse (R)' position is also transmitted to the CPU 11 through the rear sensing unit 15.

The CPU 11 drives the camera 17 installed at the rear of the vehicle by the backward signal to capture the rear of the vehicle. In this case, the camera 17 is driven when the vehicle is not started or when driving in a straight direction, and is driven in an 'off' state or under an 'on' state by controlling an applied reverse signal. The video signal picked up by the camera 17 is input to the decoder 19 as an analog signal.

The video signal in the analog state is converted into the digital state by the decoder 19, and the digital signal in the digital state is mixed with the video signal in the digital state and the distance signal in the digital state output from the CPU 11 by the mixing unit 21. Generate a signal. Since the distance signal output from the CPU 11 and the video signal output from the decoder 19 are each in a digital state, the mixing unit 21 may be mixed to generate a composite video signal in a digital state.

Then, the composite video signal in the digital state is converted into the analog state by the encoder 23 and input to the monitor 25. Accordingly, the monitor 25 displays an overlapping distance of an obstacle or a person, which may be displayed numerically or graphically, together with an image screen indicating the rear of the vehicle by the composite image signal mixed with the image signal and the distance signal. Therefore, by displaying the rear of the vehicle on the screen on the monitor 25 and visually confirming the distance to the obstacle or the person by the number or graphic, the separation distance can be accurately known, thereby reducing an accident such as a collision.

The monitor 25 may be in an 'on' state or an 'off' state before the vehicle reverses. Even in the 'off' state, the shift gear is moved to the 'reverse (R)' position so that the reverse signal is input. In this case, the state of the vehicle is turned on by the control of the CPU 11 and the rear state of the vehicle is displayed by the input image signal.

As described above, the present invention provides a digital state while generating a warning sound when an obstacle or a person is within a first distance, for example, 120 cm, at a rear warning part by a backward signal input during backward driving and parking of a vehicle. Outputs the distance signal of. Then, the CPU to which the reverse signal is input is controlled so that a camera installed at the rear of the vehicle is driven to capture the rear of the vehicle to generate a video signal, convert the video signal into a digital state, and then convert the video signal into a digital image in the mixing unit. The composite video signal is generated by mixing the signal and the distance signal. When the composite video signal is converted into an analog state by an encoder and input to the monitor, the monitor displays an overlapping distance of an obstacle or a person that can be displayed numerically or graphically together with an image screen indicating the rear of the vehicle.

Therefore, the present invention has the advantage of being able to simultaneously display the distance or the distance to the obstacle or person on the screen indicating the rear situation of the car on the monitor in numbers or graphics to reduce the accident due to collision or the like.

Claims (4)

A rear warning unit which is driven by a rear signal input when the vehicle is driven and calculates a separation distance from an obstacle or a person located in a traveling direction, and outputs a distance signal in a digital state while generating a warning sound when the distance is smaller than a first distance; A rear sensing unit for outputting the reverse signal and the distance signal output from the rear warning unit to a central processing unit (CPU); A camera installed at the rear of the vehicle and operated by the reverse signal to capture an image of the rear of the vehicle to generate an analog image signal; A decoder for converting the video signal into a digital state; A mixing unit for mixing the video signal in the digital state and the distance signal in the digital state to output a composite video signal in the digital state; An encoder for converting the composite video signal of the digital state into an analog state; And a monitor configured to receive the composite video signal in the analog state and display the separation distance of the obstacle or the person on the screen in the rear state of the vehicle. The rear monitoring apparatus for a vehicle according to claim 1, wherein the rear warning unit generates a warning sound whenever the distance between the obstacle or the person becomes the second and third distances smaller than the first distance. The vehicle rear monitoring apparatus according to claim 2, wherein the first, second, and third distances are 120 cm, 80 cm, and 40 cm, respectively. The vehicle rear monitoring apparatus according to claim 1, wherein the monitor is in an 'on' state by controlling the CPU when the monitor is in an 'off' state before the vehicle reversing.