JP6942424B2 - Rear image display device for vehicles - Google Patents

Description

The present invention relates to a rear image display device for a vehicle that displays a rear image captured by a camera mounted on the vehicle on a display device in the vehicle interior.

Rear camera North American regulation (FMVSS111) requires that the responsiveness of displaying the rear camera image within 2 seconds after moving the shift lever to the reverse position must be satisfied.

Conventionally, after the sub CPU detects that the shift lever has been set to the reverse position by the driver to display the rear camera image, the main CPU converts the image data of the rear camera via the video decoder. A vehicle image processing device that outputs to a display unit is known (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2016-88249

By the way, like the vehicle image processing device disclosed in Patent Document 1, the first processing unit that detects that the shift lever has been put into the reverse position (reverse position), and the rear camera image based on the detection result. If it is different from the second processing unit that performs the processing related to, and it takes time to send and receive signals between these first and second processing units, after the shift lever is put in the reverse position. There was a problem that it took time for the rear camera image to be displayed. For example, if various events including the shift lever being put in the reverse position are detected in the first processing unit and information indicating the occurrence of the events is transmitted to the second processing unit in the order of detection, the events occur. If there are many events, it will take time for the second processing unit that processes various events to perform processing related to the shift lever, and the time until the rear camera image is displayed will be delayed accordingly. .. Further, when the number of events that can be received by the second processing unit is limited, the information that detects that the shift lever has been put in the reverse position is not transmitted to the first processing unit when the limit is exceeded. Since this can happen, it is necessary to retransmit the same information after that, and the time until the rear camera image is displayed may be further longer.

The present invention has been created in view of these points, and an object of the present invention is to display a rear image for a vehicle, which can shorten the time from when the shift lever is placed in the retracted position until the rear image is displayed. To provide the equipment.

In order to solve the above-mentioned problems, the vehicle rear image display device of the present invention includes rear imaging means for imaging the rear of the vehicle, backward position detecting means for detecting that the shift lever is in the backward position, and occurrence events. Communication data creation means that creates and transmits the corresponding communication data, and is a communication data creation means that includes backward information indicating the detection result by the backward position detection means in the communication data, and communication transmitted by the communication data creation means. The shift lever retracts the communication data receiving means for receiving data, the backward information extracting means for extracting the backward information included in the communication data received by the communication data receiving means, and the backward information extracted by the backward information extracting means. It is provided with a switching processing means for switching an image captured by the rear imaging means as a display target in the display device when indicating that the position is located.

By including the backward information in the communication data created in response to some occurrence event, the backward information is transmitted without delay even when the number of occurrence events is large, and the rear image captured by the rear imaging means is displayed. Since the switching is possible, it is possible to shorten the time from when the shift lever is moved to the retracted position until the rear image is displayed.

The communication data transmitted from the communication data producing means described above, the plurality of generated events is created for each occurrence event, contain retracted information to a plurality of communication data corresponding to each of the plurality of generated events, a plurality of Each of the generated events is an event that is not related to the backward position detection of the shift lever. As a result, the backward information can be reliably transmitted.

Further, it is desirable that the switching processing means described above switches the display target on the display device to the image captured by the rear imaging means when the state of the shift lever indicated by the backward information changes from a position other than the backward position to the backward position. .. This makes it possible to switch to the rear image at the timing when the shift lever is put into the retracted position.

Further, the above-mentioned communication data creating means is prepared to transmit the backward information when there is no occurrence event to include the backward information when the backward position detecting means detects that the shift lever is in the backward position. It is desirable to create spare communication data. As a result, even if the shift lever is put into the retracted position in the absence of an event, the reverse information can be reliably transmitted.

Further, a communication buffer for storing the communication data transmitted from the above-mentioned communication data creating means for a predetermined number of occurrence events is further provided, and the communication data receiving means can read the communication data in the order of being stored in the communication buffer. desirable. Even when the communication data is read out and processed in the order of the events that occur in this way, the backward information can be transmitted in response to the event that occurred when the shift lever was put in the backward position, so that the backward image can be displayed. The delay time for display switching can be minimized.

Further, it is desirable that the backward information described above is 1-bit information added to a predetermined bit position of the communication data. As a result, it is possible to minimize an increase in the amount of communication data due to the addition of backward information.

It is a figure which shows the structure of the rear image display device for a vehicle of one Embodiment. It is a flow chart which shows the operation procedure which detects that the shift lever was put in the retracted position and notifies the image control part. It is a flow chart which shows the operation procedure which switches to a rear image after detecting that the shift lever was put in the retracted position. It is a figure which shows an example of the storage state of the communication data in a communication buffer. It is a figure which shows another example of the storage state of the communication data in a communication buffer.

Hereinafter, a vehicle rear image display device according to an embodiment to which the present invention is applied will be described with reference to the drawings.

FIG. 1 is a diagram showing a configuration of a vehicle rear image display device according to an embodiment. As shown in FIG. 1, the vehicle rear image display device 1 of the present embodiment includes a rear camera 10, an image memory 12, a signal detection unit 20, a communication buffer 30, a video control unit 40, a display processing unit 50, and a display device 52. It has.

This vehicle rear image display device 1 is mounted on a vehicle, and when the position of the shift lever is set to the rear (reverse position), an operation of displaying a rear image of the rear of the vehicle on a screen in the vehicle interior. I do. Further, in the present embodiment, each of the signal detection unit 20 and the image control unit 40 is realized by using separate microcomputers, and communication data transmission / reception between them is performed via the communication buffer 30. It is performed by communication between microcomputers.

The rear camera 10 is attached to the rear of the vehicle and captures an imaging range behind the own vehicle including the road surface. For example, a CCD image sensor or a CMOS image sensor may be used, and a camera having a wide angle of view may be used by attaching a wide-angle lens such as a fisheye lens. The image memory 12 stores the image obtained by the image captured by the rear camera 10 at a predetermined frame rate (for example, 30 frames / second).

The signal detection unit 20 detects that the shift lever is in the retracted position by acquiring information about the shift position sent by CAN (Controller Area Network) communication from an engine control device (not shown) or the like. Further, the signal detection unit 20 detects various occurrence events, creates communication data including information (event information) related to the occurrence event, and transmits the communication data to the video control unit 40. Backward information indicating the detection result of the shift lever position (whether or not it is in the backward position) is added to this communication data.

The communication buffer 30 stores communication data transmitted from the signal detection unit 20 for a predetermined number of N occurrence events. The communication buffer 30 is processed by a first-in first-out (FIFO) method, and the read communication data is deleted.

The image control unit 40 receives communication data via the communication buffer 30 to extract backward information, and when the backward information indicates that the shift lever has been moved to the backward position, the rear camera 10 provides the image control unit 40. A process of switching the captured rear image as a display target on the display device 52 is performed. For this purpose, the video control unit 40 includes an event receiving unit 42, a backward information extraction unit 44, a switching determination unit 46, and a rear camera switching unit 48.

The event receiving unit 42 receives the communication data for the generated event transmitted by the signal detecting unit 20 by reading it from the communication buffer 30. The backward information extraction unit 44 extracts backward information included in the communication data received by the event receiving unit 42. The switching determination unit 46 determines whether or not to switch the rear image captured by the rear camera 10 as a display target based on the retreat information extracted by the retreat information extraction unit 44. For example, it is determined that the shift lever is switched when the backward information indicates that the shift lever is in the backward position.

The rear camera switching unit 48 performs a process of switching the display target to the rear image when the switching determination unit 46 determines that the image is to be switched. For example, before that, images such as a map screen or guidance screen during navigation processing (these are referred to as "navigation screens") and a playback screen during audio reproduction processing (this screen is referred to as "audio screen") are displayed. If so, switching from these images to the rear image is performed.

The display processing unit 50 performs a process of converting the rear image output from the rear camera switching unit 48 and other images before switching into a predetermined video signal and displaying the image on the display device 52. The display device 52 is provided in front of the driver's seat or between the driver's seat and the passenger seat, and is composed of, for example, an LCD.

The rear camera 10 described above is used as a rear imaging means, the signal detecting unit 20 is used as a backward position detecting means and a communication data creating means, the event receiving unit 42 is used as a communication data receiving means, and the backward information extracting unit 44 is used as a backward information extracting means. The switching determination unit 46 and the rear camera switching unit 48 correspond to the switching processing means, respectively.

The vehicle rear image display device 1 of the present embodiment has such a configuration, and the operation thereof will be described next.

FIG. 2 is a flow chart showing an operation procedure for detecting that the shift lever has been moved to the retracted position and notifying the video control unit 40.

The signal detection unit 20 determines whether or not some event has occurred (whether or not the occurrence event has been detected) (step 100). For example, a number of event information is input to the signal detection unit 20 via CAN communication or other interfaces, and the signal detection unit 20 detects an event that has occurred based on these event information. The event information may include vehicle speed information, steering wheel angle information, air conditioner (temperature, operation mode, etc.) information acquired by CAN communication, volume information related to playback audio, song information to be played back, operation key information, and the like. ..

If any event has occurred, a positive determination is made in the determination in step 100. Next, the signal detection unit 20 determines whether or not the shift lever is in the retracted position (step 102). When it is in the backward position, an affirmative determination is made, and the signal detection unit 20 adds backward information indicating that the shift lever is in the backward position, and creates communication data corresponding to the occurrence event (step 104). .. Further, when the shift lever is not in the retracted position, a negative determination is made in the determination in step 102, and the signal detection unit 20 responds to the occurrence event by adding backward information indicating that the shift lever is not in the retracted position. Create communication data to be used (step 106).

On the other hand, if no event has occurred, a negative determination is made in the determination in step 100. Next, the signal detection unit 20 determines whether or not the shift lever is in the retracted position (step 108). If it is not in the retracted position, a negative determination is made, and the process returns to step 100 to determine the presence or absence of an event that has occurred. Further, when the shift lever is in the retracted position, an affirmative determination is made in the determination in step 108, and the signal detection unit 20 adds backward information indicating that the shift lever is in the retracted position to the part related to the event. Create preliminary communication data including dummy data (step 110).

The communication data created in steps 104, 106, and 110 in this way is transmitted from the signal detection unit 20 (step 112). After that, the process returns to step 100 and the presence / absence of the occurrence event is determined.

FIG. 3 is a flow chart showing an operation procedure for switching the image displayed on the display device 52 to the rear image after detecting that the shift lever has been moved to the retracted position. Note that FIG. 3 focuses on the operation procedure related to the switching of the rear image, and omits the processing of the generated event.

The communication data created and transmitted according to the operation procedure shown in FIG. 2 is sent to and stored in the communication buffer 30 in the order of transmission.

FIG. 4 is a diagram showing an example of a storage state of communication data in the communication buffer 30. The example shown in FIG. 4 is a case where the communication data corresponding to the occurrence event includes the backward information indicating the position of the shift lever, and when the events 1 and 2 occur, the shift lever is not in the backward position and the event It shows the case where the shift lever is put into the retracted position at the time when 3 occurs. The 1-bit backward information shown in FIGS. 4 and 5 indicates that the shift lever is in the backward position by "1" and that the shift lever is not in the backward position by "0".

FIG. 5 is a diagram showing another example of the storage state of communication data in the communication buffer 30. The example shown in FIG. 5 shows a case where the shift lever is put into the retracted position in a state where no event has occurred. The communication data created in this case includes dummy data not related to the occurrence event in addition to the backward information indicating the backward position.

The event receiving unit 42 determines whether or not the communication data before reading is stored in the communication buffer 30 (step 200). If no communication data is stored, a negative judgment is made and this judgment is repeated. Further, when the communication data before reading is stored in the communication buffer 30, a positive determination is made in the determination in step 200.

Next, the backward information extraction unit 44 extracts backward information included in the communication data stored in the communication buffer 30 (step 202). Further, the switching determination unit 46 determines whether or not the shift lever is in the retracted position based on the extracted backward information (step 204). If the shift lever is not in the retracted position, a negative determination is made, and the process returns to step 200 to repeat the determination of the presence or absence of communication data.

Further, when the shift lever is in the retracted position, an affirmative determination is made in the determination in step 204. Next, the rear camera switching unit 48 switches the display target from the images such as the navigation screen and the audio screen that have been displayed so far to the rear image captured by the rear camera 10 and stored in the image memory 12 (step). 206). In this way, a series of switching processes to the rear image is completed.

As described above, in the vehicle rear image display device 1 of the present embodiment, by including the backward information in the communication data created in response to some occurrence event, the delay is delayed even when the number of occurrence events is large. Since it is possible to transmit the backward information and switch to the rear image captured by the rear camera 10, it is possible to shorten the time from when the shift lever is moved to the backward position until the rear image is displayed. In particular, by including the backward information in all communication data, the backward information can be reliably transmitted.

Further, when the state of the shift lever indicated by the backward information changes from a position other than the backward position to the backward position, the shift lever is moved to the backward position by switching the display target on the display device 52 to the image captured by the rear camera 10. It is possible to quickly switch to the rear image according to the timing of insertion.

Also, when it is detected that the shift lever is in the backward position, if there is no occurrence event that includes backward information, spare communication data prepared for transmitting backward information is created, so it occurs. Even if the shift lever is put into the retreat position in the absence of an event, the retreat information can be reliably transmitted.

Further, even when the communication data stored in the communication buffer 30 is read out and processed in the order of the occurrence events, the backward information can be transmitted corresponding to the occurrence event at the time when the shift lever is put in the backward position. Therefore, the delay time for switching the display to the rear image can be minimized.

Further, by using the backward information as 1-bit information to be added to a predetermined bit position of the communication data, it is possible to minimize the increase in the amount of communication data due to the addition of the backward information.

The present invention is not limited to the above embodiment, and various modifications can be made within the scope of the gist of the present invention. For example, in the above-described embodiment, the communication buffer 30 is provided separately from the signal detection unit 20 and the video control unit 40, but the signal detection unit 20 and the video control unit 40 may include the communication buffer 30. Further, although the case of transmitting / receiving communication data via the communication buffer 30 has been described, the method of transmitting / receiving communication data is not limited to this method, and other communication methods may be used as long as the communication data is transmitted / received in the order of occurrence events. You may use it.

As described above, according to the present invention, by including the backward information in the communication data created in response to some occurrence event, the backward information is transmitted without delay even when the number of occurrence events is large. Since it is possible to switch to the rear image captured by the rear imaging means, it is possible to shorten the time from when the shift lever is moved to the retracted position until the rear image is displayed.

1 Rear image display device for vehicles 10 Rear camera 12 Image memory 20 Signal detection unit 30 Communication buffer 40 Video control unit 42 Event reception unit 44 Backward information extraction unit 46 Switching judgment unit 48 Rear camera switching unit 50 Display processing unit 52 Display device

Claims (5)

Rear imaging means for imaging the rear of the vehicle,
A retracted position detecting means for detecting that the shift lever is in the retracted position,
A communication data creating means for creating and transmitting communication data corresponding to an occurrence event, and a communication data creating means for including the backward information indicating a detection result by the backward position detecting means in the communication data.
A communication data receiving means for receiving the communication data transmitted by the communication data creating means, and a communication data receiving means.
A backward information extracting means for extracting the backward information included in the communication data received by the communication data receiving means, and a backward information extracting means.
When the backward information extracted by the backward information extracting means indicates that the shift lever is in the backward position, a switching process for switching the image captured by the backward imaging means as a display target in the display device. Means and
The communication data transmitted from the communication data creating means is created for each occurrence event for a plurality of occurrence events.
The retreat information is included in the plurality of communication data corresponding to each of the plurality of occurrence events.
Wherein the plurality of each of the occurred event, the rearward image display apparatus for a vehicle, wherein an event der Rukoto unrelated to the retracted position detection of the shift lever. When the state of the shift lever indicated by the backward information changes from a position other than the backward position to a backward position, the switching processing means switches the display target in the display device to an image captured by the rear imaging means. The vehicle rear image display device according to claim 1. The communication data creating means transmits the backward information in the absence of the occurrence event that includes the backward information when the shift lever is detected to be in the backward position by the backward position detecting means. The vehicle rear image display device according to claim 1 or 2 , wherein the prepared spare communication data is created. A communication buffer for storing the communication data transmitted from the communication data creating means for a predetermined number of occurrence events is further provided.
The vehicle rear image display device according to any one of claims 1 to 3 , wherein the communication data receiving means reads out the communication data in the order stored in the communication buffer. The vehicle rear image display device according to any one of claims 1 to 4 , wherein the reverse information is 1-bit information added to a predetermined bit position of the communication data.

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