JP3498127B2 - Rear monitor - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rear monitoring device used by a driver to monitor the rear of a vehicle when the vehicle is moving backward.

[0002]

2. Description of the Related Art As a rear monitoring device for confirming the rear of a vehicle, a video signal obtained by a camera device mounted at the rear end of the vehicle is transmitted to a monitor device provided in a driver's seat or the like, and this monitor device is used. There has always been something that drivers check. Further, in these rear monitoring camera devices, various devices have been devised for automatically switching the image displayed on the monitor device in order to reduce the load on the driver.

Hereinafter, as a technique of this type, the actual Kaihei 2-7
The device disclosed in Japanese Patent No. 8439 will be described as an example. Figure 11
FIG. 2 is a configuration diagram showing the vehicle-mounted television system described in the above publication, which includes a rear monitoring television camera 101 mounted on the rear portion of the vehicle body, and a front or front left monitoring camera 105 mounted on the front portion of the vehicle body or on the front left side of the vehicle body. Are connected to a camera control circuit 103 via a control cable 102. In this camera control circuit 103, in accordance with a shift gear position signal from a shift gear position detection circuit 106, the rear monitoring television camera 101 or the front or front left side. Surveillance camera 1
Monitor TV 1 by switching the video from 05 respectively
It is displayed on 04.

That is, according to the rear monitoring apparatus shown in FIG. 11, the images of the front or front left monitoring camera 105 and the rear monitoring camera 101 are controlled by the camera control circuit 103 according to the shift gear position detected by the shift gear position detection circuit 106. Is switched and displayed on the monitor TV 104,
It is not necessary for the driver to switch between the front and rear images, and the required image can be automatically obtained in conjunction with the shift position.

In addition, Japanese Patent Laid-Open No. 02-31957,
JP-A-56-8729, JP-A-51-30420
Japanese Patent Laid-Open No. 04-243639, Japanese Utility Model Laid-Open No. 60
Similar techniques have been proposed in Japanese Patent Laid-Open No. 66175, Japanese Utility Model Laid-Open No. 3-104447, etc., but all of them are configured to project a rear image in conjunction with the position of the shift lever.

[0006]

SUMMARY OF THE INVENTION In the prior art as described above, an image required for interlocking with the position of the gear shift lever,
In particular, since the rear image is obtained, there is a problem that the obtained image is determined only by the shift position, and this is not necessarily the image required by the driver. For example, when the position of the shift lever deviates from the back (BACK) position, such as when the vehicle is parked while turning over, the image on the monitor TV is switched each time, which not only makes it very difficult for the driver to see. However, there was a problem that the rear image could not be obtained even though the driver needed the rear image when moving forward at a slow speed.

Further, when the parking position of the rear of the vehicle is adjusted while moving forward, the shift lever is driven by the drive (D
Since it is in the (RV) position, there is also a problem that the rear image required by the driver cannot be obtained.

Further, in the configuration in which the camera power is turned on / off in association with the shift position, the ON / OF
Since the number of times of F increases, there is a disadvantage that the durability of the monitoring device itself is deteriorated due to the rush current.

The present invention has been made to solve the above-mentioned problems, and determines the running state of a vehicle, that is, the situation in which a rear image is required and the situation in which the rear image is not required, and rearward is determined according to those traveling conditions. The purpose is to provide the necessary video to the driver by automatically switching between video and normal video.

[0010]

The present invention is provided with a traveling state discriminating means 4 for discriminating whether the present traveling state is a normal traveling state or a parking traveling state, and the traveling state discriminating means 4 has a shift lever in a back position. When it enters, it is determined that the vehicle is in the parking traveling state, and thereafter, when the steering wheel operation and the brake operation frequency becomes less than the predetermined number of times, it is determined that the vehicle returns to the normal traveling state, and when the traveling state determining means determines that the vehicle is in the parking traveling state, The rear image obtained from the camera 1 which is the rear image pickup means is selected by the image switching means 3 and displayed on the monitor 6 which is the display means.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION FIG. 1 is a block diagram showing the configuration of a rear monitoring device according to the precondition technique 1 of the present invention. In the figure, a camera 1 as a rear image pickup means attached to a rear part of a vehicle body and a normal image output device 2 for outputting a normal image such as a navigation image, a TV image, and a front image are SWs which are image changing means via a control cable 102. It is connected to the (switch) 3. The image switching means SW3 displays the rear image obtained by the camera 1 and the normal image obtained by the normal image output device 2 on the basis of the image selection signal 5 from the microcomputer 4 which is the running state determination means. Switching control is performed, and an image to be displayed is selected and output to the monitor 6, which is a display means.

In the precondition technique 1, a manual SW input signal, a shift lever position signal, and a vehicle speed signal are input to the microcomputer 4 which is the running state determining means, and the microcomputer 4 is based on these input signals. It is determined whether the current traveling state is the normal traveling state or the parking traveling state, and the result of the traveling state determination is output to the image switching means SW3 as the image selection signal 5. Here, the shift lever position signal as the input signal is a signal indicating the shift position of the shift lever. For example, generally, the parking mode (P), the back mode (B), the neutral mode (N), the drive as shown in FIG. It is a signal indicating which of the mode (D), the second mode (2) and the low mode (L) the position is. Further, the vehicle speed signal is a signal sent from a rotation speed detection sensor such as a wheel, and the manual switch input signal is a signal issued when the rear image or the normal image is selected by itself.

[0013] Next, the operation of the rear monitoring apparatus shown in FIG. FIG. 2 is an operation flowchart of the microcomputer 4, which is a running state determination means.
After the accessory 4 is turned on and the microcomputer 4 is initialized (step 201), the normal traveling mode is set in step 202. In this normal running mode, the video switching means SW3 connects the normal video output device 2 to the monitor 6, and normal videos such as navigation, TV, and front video are displayed on the monitor 6.

At step 203, shift lever position determination is performed, and it is determined whether the shift lever has entered the back position. When the shift lever enters the back position, this operation triggers the parking traveling mode (step 204), the SW3 is switched by the image selection signal 5, and the camera 1 which is the rear imaging means and the monitor 6 are connected. The rear image is output to the monitor 6. When the shift lever is in a position other than the back position, the normal traveling mode is maintained and the monitor 6 displays a normal image.

At step 205, the vehicle speed is determined,
It is determined whether the vehicle speed V has exceeded the set vehicle speed VL. If the vehicle speed V exceeds the set vehicle speed VL, step 2
The flow shifts to 02 to return to the normal traveling mode, and the normal image is displayed on the monitor 6. When the vehicle speed does not exceed the predetermined vehicle speed VL, the parking traveling mode is maintained, and the rear image is displayed on the monitor 6.

FIG . 3 shows an example of an image displayed on the monitor 6 corresponding to the shift lever position and the vehicle speed. When the shift lever enters the back position (point a in the figure) from the state of the x range in the normal running state in which the normal image is displayed on the monitor 6, the parking drive mode is entered and the rear image is displayed on the monitor 6. Is output. Then, once the vehicle is set to the parking traveling mode, as long as the vehicle speed V <the set vehicle speed VL is satisfied, the parking traveling mode is changed even if the position of the shift lever changes from the back position to another position as shown in the area b in the figure. Will remain fixed to. Therefore, the image selection signal does not change, and the rear image is stably displayed on the monitor 6. After that, the vehicle returns to the normal running, and if the vehicle speed V ≧ the set vehicle speed VL (see c in the figure)
Point), the normal image running mode is set, and the normal image is output to the monitor 6. When the reverse drive is completed and Acc is turned off, the entire system goes down.

As described above, according to the base technology 1, even if the vehicle is once in the parking traveling mode and the position of the shift lever fluctuates from the back during parking traveling, the vehicle speed V <the set vehicle speed V.
As long as L is satisfied, the driver can obtain a stable rear image. Note that, in step 203 in FIG.
In 205, since the manual SW input is always accepted, it is possible for the driver to manually switch the display image if desired.

[0018] Embodiment 1. In the above-described base technology 1, the microcomputer 4 which is the traveling state determination means automatically determines the parking traveling state and the normal traveling state using the shift lever position and the vehicle speed as input information. However, in the first embodiment of the present invention, Configure the algorithm using different criteria such as brakes and steering wheel. FIG. 4 is a flowchart showing a case where the traveling state is determined based on the shift lever position, the handle operation frequency, and the brake operation frequency. The handle operation and brake operation detection means 210 constantly detects the handle operation and brake operation frequencies, In step 211, it is determined whether or not the frequency of handle operation and brake operation exceeds a predetermined number of times. If the frequency of the steering wheel operation and the brake operation is low, the process proceeds to step 202 to return to the normal traveling mode,
A normal image is displayed on the monitor 6. When the frequency of the steering wheel operation and the brake operation exceeds the predetermined number of times, it is determined that the vehicle is in the parking traveling mode, and the rear image is displayed. Further, in the parking traveling state of FIG. 4, it is more preferable to return to the normal traveling state when the vehicle speed V ≧ the set vehicle speed VL regardless of the determination of step 211 and display the normal image.

Furthermore, as the system configuration, a microcomputer 4 and the display image switching unit is a running state judging means S
W3 may be included in the normal video output device 2 such as a navigation system, or may be included in the monitor 5 or the camera 1.

Further , the power supply of the camera 1 is turned on / off according to the discrimination result of the traveling state discriminating means 4, for example, it is turned on in the parking traveling state and turned off in the normal traveling state to reduce the power consumption. You may plan. On the other hand, the time loss at the time of rising of the image when the rear image is selected may be reduced by always keeping the power on regardless of the determination result of the traveling state determination unit 4.

In the present embodiment, the configuration is such that it responds to a manual input signal from the driver, but it does not have to be particularly provided.

[0022]

As described above, according to the present invention, the rear state image and the normal image can be automatically switched by discriminating between the normal traveling state and the parking traveling state by the traveling state discriminating means. It is possible to provide the driver with an image according to the condition.

In particular, when the driver needs the rear image, the rear image can be stably provided. Further, when the vehicle is normally driven, the normal image is displayed promptly, which improves the convenience of the driver.

Furthermore, it is possible to reduce the ON / OFF times of the rear image pickup means, compared with the conventional device, there is no risk of impaired durability of the apparatus by rush current.

[Brief description of drawings]

FIG. 1 is a block diagram showing a basic configuration of a rear monitoring device according to a prerequisite technology 1 of the present invention.

FIG. 2 is a flowchart showing a flow of processing in a traveling state determination means of the prerequisite technology 1 of the present invention.

FIG. 3 is an example of an operation waveform in the base technology 1 of the present invention, showing an example of a display image corresponding to a shift lever position and a vehicle speed.

FIG. 4 is a flowchart showing a processing flow of a traveling state determination means according to the first embodiment of the present invention.

FIG. 5 is a block diagram showing the configuration of a conventional rear monitoring device.
Is.

[Explanation of symbols]

1 rear imaging means, 2 normal video output device, 3, 30
Image switching means, 4, 40 running state determination means, 5 image selection signal, 6 display means, 31 shift position waveform, 32
Vehicle speed waveform, 33 video selection signal waveform, 44 period setting means, 45 forward / backward movement determining means, 51 shift lever S
W, 52 comparator, 53 period setting resistor, 54
Period setting capacitor, 30a Video selection switch, 30
b Camera power SW, 40a Period setting means.

Claims (3)

(57) [Claims] 1. A rear image pickup means for picking up an image of a situation behind a vehicle, a running state decision means for discriminating whether a present running state is a normal running state or a parked running state, and an image obtained by the rear image pickup means for a driver. The display state providing means and the image switching means for selecting the display image are provided, and the traveling state determination means determines that the vehicle is in the parking traveling state when the shift lever is in the back position, and thereafter, the steering wheel operation and the brake operation frequency. Is determined to return to the normal traveling state when the number of times is less than the predetermined number of times, and when the traveling state determining means determines that the vehicle is in the parking traveling state, the rear image captured by the rear image capturing means is selected by the image switching means. And a rear monitoring device which is displayed by the display means. 2. The traveling state determination means determines that the vehicle is in a parking traveling state when the shift lever enters the back position, and
The rearward monitoring device according to claim 1, wherein it is determined that the vehicle returns to the normal traveling state when the frequency of steering operation and brake operation becomes less than a predetermined number of times or the vehicle speed exceeds a set vehicle speed. 3. During a period when it is determined that the vehicle is parked.
Only, operating the rear imaging means.
The rear monitoring device according to claim 1 or claim 2.