CN117207774A

CN117207774A - Vehicle-mounted instrument display system and method for improving reliability

Info

Publication number: CN117207774A
Application number: CN202311342659.0A
Authority: CN
Inventors: 黄炎; 葛亮
Original assignee: Bertek Automotive Electronics Wuhu Co ltd
Current assignee: Bertek Automotive Electronics Wuhu Co ltd
Priority date: 2023-10-17
Filing date: 2023-10-17
Publication date: 2023-12-12

Abstract

The application discloses a vehicle-mounted instrument display system capable of improving reliability, which comprises a video loop, a CAN loop, a verification processing unit and a display unit, wherein the video loop is configured to receive and deserialize an input video signal, the CAN loop is configured to analyze a state signal corresponding to an indicator lamp to be verified based on the input CAN signal, the verification processing unit is used for verifying the deserialized video signal based on the state signal corresponding to the indicator lamp to be verified, and the video data after the verification processing is sent to the display unit for instrument display. The safety data related to the received video data are checked through the purpose of redundancy check at the instrument end, so that the safety of the vehicle-mounted display screen on the state display of the indicator lamp is improved.

Description

Vehicle-mounted instrument display system and method for improving reliability

Technical Field

The application relates to the field of automobile instruments, in particular to a vehicle-mounted instrument display system and method capable of improving display reliability.

Background

Along with the development of technology, the vehicle-mounted instrument is increasingly digitalized and intelligent, and the vehicle-mounted instrument in the prior art is developed from the original pointer type instrument to the digital liquid crystal instrument. As shown in fig. 1, the working principle of the prior art automobile instrument is as follows: the LVDS video signals transmitted by the cabin host or the domain control are received by the deserializer and then are directly transmitted to the display unit for display, and in the process, the error rate of the deserializer at the current common level is extremely low, so that the received video signals are consistent with the video signals output to the display unit, but the correctness of the video content cannot be checked.

Although the reliability of the display of the instrument is guaranteed to a certain extent in this way, because the instrument is an important component of vehicle-mounted man-machine interaction, many indicator lamps related to safety indication need to be displayed through the instrument, such as an EPB indicator lamp and an engine water temperature indicator lamp, the indicator lamps are used for controlling a display unit to display through received video data, namely, the video data comprise video data corresponding to the state of the indicator lamps, but due to transmission problems and analysis problems, whether the video data corresponding to the indicator lamps are reliable or not is very important, the state of the indicator lamps is very important for safe driving of a driver, and once the video data corresponding to the indicator lamps are wrong, the display unit displays wrong information to the indicator lamps, and driving safety accidents can be caused for the driver through wrong signals, so that the video data of the indicator lamps related to driving safety in a vehicle-mounted instrument display system need to be ensured to be accurate and reliable, and further realizing the accurate and reliable display state.

In the prior art, although the accuracy of video signal transmission can be ensured, the accuracy of the key video display content corresponding to the indicator lamp related to driving safety cannot be checked.

Disclosure of Invention

The application aims to overcome the defects of the prior art and provide a vehicle-mounted instrument display system and a vehicle-mounted instrument display method for improving reliability.

In order to achieve the above purpose, the technical scheme adopted by the application is as follows: the utility model provides an on-vehicle instrument display system of promote reliability, includes video return circuit, CAN return circuit, check-up processing unit, display element, and wherein video return circuit is configured to receive and deserialize the video signal of input, and CAN return circuit is configured to be based on the corresponding status signal of the pilot lamp of required check of CAN signal analysis, check-up processing unit carries out check-up processing to the video signal after the deserialization based on the corresponding status signal of the pilot lamp of required check of analysis, and sends the video data after the check-up processing to display element in the instrument display.

The video loop comprises a video receiving unit which is used for receiving a video signal required by instrument display, deserializing the video signal and sending the video signal to a verification processing unit.

The CAN loop comprises a CAN signal receiving unit and a logic control unit, wherein the CAN signal receiving unit is used for accessing a whole CAN network to obtain a whole CAN signal and sending the CAN signal into the logic control unit; the logic control unit is used for analyzing out the state data required by the verification and forwarding the state data to the verification control unit.

The verification processing unit comprises a bridging unit and a storage unit, wherein the bridging unit is respectively connected with the video receiving unit, the logic control unit and the storage unit; wherein:

the storage unit stores image information corresponding to the status signal of the indicator light in advance;

the bridging unit reads corresponding image information from the storage unit based on the indicator lamp state signal sent by the logic control unit;

the bridging unit reads image information of the position of the indicator lamp to be compared from the video signal sent by the video receiving unit;

the bridging unit performs verification processing on the image information read in the storage unit and the image information identified in the picture signal, and sends the processed video data to the display unit for display.

A vehicle-mounted instrument display method for improving reliability is characterized in that the state information of an indicator lamp to be checked is analyzed based on CAN signals; acquiring corresponding image information for verification based on the state information of the indicator lamp;

and obtaining corresponding image information for verification based on the state information of the indicator lights, performing verification processing on the received video signals for instrument display to obtain verified video signals, and sending the images to a display unit for display.

The verification process comprises the following steps:

analyzing video image information corresponding to the position of the indicator lamp to be checked based on the received video signal for instrument display;

comparing the video image information corresponding to the position of the indicating lamp to be checked based on the image information for checking, judging whether the video image information is the same, if so, directly transmitting the received video signal for instrument display to a display unit; otherwise, the image information for verification is replaced and analyzed to obtain the video image information corresponding to the position of the indicator lamp to be verified, so that a new video signal is forwarded to the display unit.

The method comprises the steps of selecting an indicator lamp to be checked in advance based on the safety requirement of a vehicle, storing image information corresponding to different state signals of the indicator lamp in a storage unit to form a mapping relation, and acquiring corresponding pre-stored image information by combining the state signals of the indicator lamp read based on CAN signals with the mapping relation during the checking.

The prestored indicator light image information comprises coordinate information corresponding to the indicator light image in the display screen, and the image information corresponding to the coordinates in the video signal is indexed based on the coordinate information to form video image information corresponding to the position of the indicator light to be checked.

The method for comparing the video image information corresponding to the position of the indicating lamp to be checked based on the image information for checking comprises the following steps: the method comprises the steps of presetting core pixel position coordinates for comparing verified image information with video image information, acquiring the position of a core pixel in the video image information based on coordinate matching, and comparing RGB values of images corresponding to the core pixel to judge whether the images are identical pixel images.

When the verification and comparison results are consistent, entering a normal state, and forwarding the received video signals to a display unit for instrument display; otherwise, entering an alarm state, and fusing the alarm image information and the video signal to form a new video signal and sending the new video signal to the display unit.

The application has the advantages that: the safety related data in the received video data are checked through the purpose of redundancy check at the instrument end, so that the safety of the vehicle-mounted display screen on the state display of the indicator lamp is improved; the display device adopts the state of the indicator lamp read by the CAN signal to carry out comparison and verification on the image of the indicator lamp in the video signal, judges whether the indicator lamp in the video signal is correct, and if the indicator lamp is correctly and directly output and displayed, otherwise, carries out alarming and/or replaces the wrong state of the indicator lamp, thereby avoiding the potential safety hazard caused by the abnormal image of the indicator lamp displayed by the instrument due to the abnormality in the video signal conversion and transmission process, and having the function of redundancy check.

2 redundant signal sources which keep independence are adopted for key display contents (indicator lights) of the instrument, and the coverage of abnormal condition detection is improved and the reliability is improved through the comparison of 2 paths of independent signal sources; the consistency of the display contents of the 2 signal sources is checked by adopting a pixel comparison method, image information can be generated to alarm according to the pixel comparison result, and compared with more common image CRC check, the fault tolerance can be controlled more flexibly; the content (the position of the indicator lamp and the corresponding image) which needs to be subjected to pixel comparison can be configured in an upgrade mode, so that the flexibility is provided.

Drawings

The contents of the drawings and the marks in the drawings of the present specification are briefly described as follows:

FIG. 1 is a schematic diagram of a prior art vehicle instrument receiving image display;

FIG. 2 is a hardware schematic of the in-vehicle instrument display system of the present application;

FIG. 3 is a schematic diagram of a display content requiring pixel alignment according to the present application;

FIG. 4 is a schematic diagram of the operating state and alarm state of the vehicle instrument display method of the present application;

FIG. 5 is a schematic diagram of signal flow direction and schematic diagram of the vehicle instrument display method according to the present application when the comparison is consistent;

FIG. 6 is a schematic diagram of signal flow and schematic diagram of the present application when there is a contrast inconsistency;

FIG. 7 is a flow chart of a method for configuring display content to be aligned according to the present application.

Detailed Description

The following detailed description of the application refers to the accompanying drawings, which illustrate preferred embodiments of the application in further detail.

As shown in fig. 1, which is a schematic diagram of a vehicle-mounted instrument display system in the prior art, LVDS video signals sent through a cabin host or domain control are received through a deserializer and then are directly sent to a display unit for display, in the process, although the error rate of the current common level is extremely low, the received video signals and video signals output to the display unit can be guaranteed to be consistent, but the correctness of video content per se can not be checked, but part of indicator lamp signals such as EPB indicator lamps are checked by users, the state of the indicator lamp signals is very important for the safety of a vehicle, and once error display can cause safety accidents for the user error signals, and the situation that whether images corresponding to the indicator lamps are abnormal or not can not be checked is existed in the prior art because of the fact that the checking function of the indicator lamps is not provided, the embodiment mainly solves the problem that redundancy check is carried out on the indicator lamps related to safety, and the reliability of the images of the indicator lamps displayed by the instrument is improved. The specific improvement scheme is as follows:

the utility model provides an on-vehicle instrument display system of promote reliability, includes video return circuit, CAN return circuit, check-up processing unit, display element, wherein video return circuit is configured to receive and deserialize the video signal of input, CAN return circuit is configured to based on the corresponding status signal of the pilot lamp of required check of CAN signal analysis of input, check-up processing unit carries out check-up processing to the video signal after the deserialization based on the corresponding status signal of the pilot lamp of required check of analysis, and send the video data after the check-up processing to display element in the instrument display.

As shown in fig. 2, the video loop includes a video receiving unit for receiving a video signal required for the display of the meter, performing deserialization processing, and sending the video signal to the verification processing unit.

The CAN loop comprises a CAN signal receiving unit and a logic control unit, wherein the CAN signal receiving unit is used for accessing a whole CAN network to obtain a whole CAN signal and sending the CAN signal into the logic control unit; the logic control unit is used for analyzing the state data corresponding to the indicator lamp to be detected and forwarding the state data to the verification control unit.

part or all instrument indicator lamps are selected or set in advance according to the safety requirements of the whole automobile to serve as indicator lamps to be detected

The storage unit stores image information corresponding to the state signal of the indicator light to be detected in advance;

the bridging unit reads corresponding image information from the storage unit based on the state signal of the indicator lamp to be detected sent by the logic control unit;

the bridging unit performs verification processing on the image information read in the storage unit and the image information identified in the picture signal, and sends the processed video data to the display unit for display; the verification process comprises the following steps: comparing whether the two images are the same or not, if so, directly outputting the received video signals to a display unit, otherwise, reading the fault alarm image in the storage unit and fusing the video images to form a fused image, and outputting the fused image to the display unit for display. Or replacing and analyzing the image information for verification to obtain video image information corresponding to the position of the indicator lamp to be verified, thereby forming a fused video signal. Therefore, the comparison of the video signals is realized, because the video signals comprise images of each indicator lamp displayed by the vehicle-mounted instrument, the signals which are corresponding to each indicator lamp and are required to be lightened or not CAN be read from the CAN signals, the prestored image signals which are matched with the lightened or not are read based on the lightened or not state signals for comparison, if the video signals are always indicated to be normal, the video signals are directly output and displayed, otherwise, the inconsistency is likely to be caused by the abnormality of the video signals in the conversion and transmission processes, the operation of alarming or replacing the video signal lamps is required, because the priority of the CAN signals is higher than that of the video signals, the signals which are directly read from the CAN network are more accurate than the video signals, and therefore, the verification comparison CAN be carried out according to the signals.

The embodiment also provides a vehicle-mounted instrument display method for improving reliability, which comprises the following steps: analyzing the state information of the indicator lamp to be checked based on the CAN signal; acquiring corresponding image information for verification based on the state information of the indicator lamp;

The verification process comprises the following steps:

Each frame of image in the video can be positioned according to the abscissa and the ordinate, and because the position range of the indicator lamp in one frame of image is fixed, the image information in the corresponding indicator lamp range can be obtained based on the position range of the indicator lamp to be checked in each frame of image in the video; meanwhile, the pre-stored image information corresponding to the state information of the indicator lamp to be detected is compared with the pre-stored image information corresponding to the state information of the indicator lamp, if the image information of the indicator lamp to be detected is the same with the image information of the indicator lamp to be detected, the image corresponding to the indicator lamp in the video information can be considered to be correct, and the video signal is sent to the display unit to be displayed. In comparison, the video is composed of multiple frames of images, so that in image comparison, video signals are disassembled into images of one frame by one frame, and images corresponding to the indicator lamps are acquired for comparison. The method for comparing the two images comprises the following steps: the RGB values corresponding to the image information and the video image information for verification are compared, and the display screen is controlled based on the RGB data when the display screen displays the data because the state of the indicator light is different from the state of the indicator light, so that the RGB values can be directly compared, if the RGB values are the same, the comparison images are judged to be the same, otherwise, the comparison images are judged to be different.

Because the indicator lamps displayed by the meters are more, part or all of the meter indicator lamps need to be selected as the verification indicator lamp images of the application, and the selection can be based on safety consideration, such as the EPB indicator lamps and corresponding images, when a user parks on a slope, if the EPB is not started, the EPB indicator lamps are displayed by the images corresponding to the EPB indicator lamps, so that the user can mistakenly think that the EPB is started, and if the user gets off the bus with a safety risk of sliding, the EPB indicator lamps need to be used as the indicator lamps to be tested, and the meter display images corresponding to different states of the EPB indicator lamps are prestored in a storage unit, and the storage unit is a NOR F l ash. The method comprises the steps of selecting the indicator lamp which needs to be checked in advance based on the safety requirement of the vehicle, storing the image information corresponding to different state signals of the indicator lamp in a storage unit to form a mapping relation, reading the state signals of the indicator lamp based on the CAN signals during checking, and then acquiring the pre-stored image information corresponding to the state information of the indicator lamp based on the state information of the indicator lamp in combination with the mapping relation.

Because the application is based on the comparison of the images corresponding to the indicator lamps, the pre-stored indicator lamp image information needs to find the images corresponding to the indicator lamps in the video signals corresponding to the indicator lamps, and in order to define coordinates, the pre-stored indicator lamp image information in the embodiment contains the coordinate information corresponding to the indicator lamp images in the display screen, and the image information corresponding to the coordinates in the video signals is indexed based on the coordinate information to form the video image information corresponding to the position of the indicator lamps to be checked. The coordinate information can be a certain coordinate or a certain coordinate range, and the coordinate information is specifically selected according to actual needs.

The method for comparing the video image information corresponding to the position of the indicating lamp to be checked based on the image information for checking comprises the following steps: the method comprises the steps of presetting core pixel position coordinates for comparing verified image information with video image information, acquiring the position of a core pixel in the video image information based on coordinate matching, and comparing RGB values of images corresponding to the core pixel to judge whether the images are identical pixel images. Because the images of the indicator lights correspond to different colors, whether the colors of the indicator lights are the same can be compared through RGB values, if the RGB values are the same, the indicator lights are considered to belong to the same image, otherwise, the indicator lights are considered to be different images.

As shown in fig. 2, the in-vehicle meter display system in the present embodiment includes:

video signal receiving unit: 1. receiving and deserializing video signals, and 2, forwarding a bridging device;

CAN signal receiving unit: 1. receiving a CAN signal, and forwarding the CAN signal to a logic control unit;

logic control unit: 1. judging the state of display content to be compared with pixels through CAN signals, and switching the working state of the system; 3. the bridge device is communicated with a serial port of the bridge device, and a display content state value is sent;

bridging means: 1. the method comprises the steps that image information pre-stored in a storage device is fetched through a received and control logic unit, and image comparison is carried out on the image information and a video signal sent by a video receiving unit; 2. transmitting the compared processed video signals to a display device for display;

a storage device: 1. support the serial port communication with bridging unit, 2, store the image information that needs pixel to compare and report to the police the image information

And a display unit: the display device is used for displaying video signals and realizing the display function of the instrument.

In the whole vehicle, the CAN signal has high priority, belongs to a signal obtained directly by the whole vehicle, the state of the indicator lamp is arranged in the CAN bus network, the signal is more accurate than the state signal of the indicator lamp in other signals such as video signals, the state of the indicator lamp analyzed in the CAN signal corresponds to the pre-stored image one by one, the mapping relation is provided, and the corresponding pre-stored image CAN be obtained based on the CAN state analyzed in the CAN signal; and analyzing an image of the position of the indicator lamp to be detected from each frame of image in the video signal to serve as a video image, comparing each frame of video image of the video signal with a pre-stored image respectively, judging whether a difference exists or not, if the difference exists, outputting the video signal to a display unit to display the video signal correctly, and otherwise, carrying out image fusion alarm. The comparison is carried out by adopting the core pixels of the indicator lamp part, the positions of the core pixels of the indicator lamp part are selected based on the image of the indicator lamp, the cores are compared, the pixel comparison results are consistent, the normal output is carried out, and otherwise, the output environment is abnormal. The compared image is generally an image signal which is analyzed in the CAN and corresponds to an indicator lamp related to the safety of the whole vehicle. The method comprises the steps of obtaining the position of a pixel image to be compared based on coordinate matching, comparing the position of the pixel image to be compared (such as an EPB indicator lamp, CAN analyzing EPB state with a video signal EPB state image, such as a water temperature indicator lamp, and the like), comparing the image corresponding to the pixel, comparing the core pixel of the position of the indicator lamp, comparing the image based on RGB (red, green and blue) specifically, and comparing whether the images of the indicator lamps with the same or different RGB values are the same or not.

As shown in FIG. 3, the display content of the scheme for vehicle-mounted instrument products requiring pixel comparison is mainly alarm indication lamps, one or more compared alarm indication lamps are selected according to the safety requirements, such as an ABCDE (analog to digital converter) and the like, representing the position of one indication lamp in one frame of image, pre-storing images of different states of the position indication lamp of the ABCDE, and simultaneously recording the coordinate position of the ABCDE, so that the images of the position of the ABCDE of each frame of image in a video signal can be analyzed, and then the images are respectively compared correspondingly.

The display content of the indicator lamp image is compared with RGB values based on core pixels, the number of the display content to be compared with the pixels can be 1 or a plurality of display content (the specific number is according to the actual system performance), and the areas can be discrete or continuous, such as ABCDE in figure 3;

when the number of the display contents to be subjected to pixel comparison is greater than 1, respectively carrying out pixel comparison on each display content, and respectively recording the comparison results;

the storage device stores image information including a set of expected coordinate information of each image displayed on the display screen, and indexes the image content of the corresponding coordinates in the video through the coordinate information

The coordinate information can contain complete image information or key position information in the image information, so that the comparison range of single images can be adjusted, and the fault tolerance can be adjusted.

As shown in fig. 4, after receiving the valid system enable signal En, the logic control unit defaults to enter a normal state, and when the pixel comparison result of the bridge unit is inconsistent, the logic control unit enters an SS20 alarm state, and after entering the alarm state, the bridge unit can periodically perform pixel comparison in addition to the fusion alarm information, and when the pixel comparison result is consistent in a continuous period, the logic control unit returns to the normal working state and cancels the visual alarm.

The system operating state is defined as follows:

as shown in fig. 5, a description of the normal operation state is as follows:

process (1):

the video receiving unit receives an externally input video signal, deserializes the video signal and then sends the video signal to the bridging unit;

process (2):

the CAN signal receiving unit receives the CAN bus signal and forwards the CAN bus signal to the logic control unit, and the logic control unit judges the state of the display content to be compared with the pixel through the CAN signal; the logic control unit transmits the state value of the display content to be compared with the pixel to the bridging unit through serial communication;

process (3):

the bridging unit is used for calling the image information which is pre-stored and needs to be compared with the pixels from the storage unit according to the state value sent by the logic control unit;

process (4) -pixel alignment

Comparing the image information acquired by the storage unit with the video data of the corresponding coordinate information of the video signal, and judging a comparison result;

progress (5)

If the comparison results of all the images are consistent, the video signal is normally used for displaying by the display unit.

As shown in fig. 6, the description is in the alarm state, which is further based on the normal state: if one or more image content comparison results are inconsistent, the process (4) sends the result of abnormal comparison to the logic control unit through a serial port protocol;

process (6) -state switching: the logic control unit receives the result of the comparison abnormality, switches the system state to the SS20 alarm state, and informs the bridge unit through the serial port protocol:

process (7) -retrieving the alarm image information from the storage unit, fusing with the video signal, and filling with solid color pixels at image coordinate positions where the comparison is inconsistent.

After the process (7) is started, continuing to execute the processes (1) - (5) for the image parts with consistent comparison results when a plurality of images to be compared exist, executing the processes (2), (3) and (4) for the images with inconsistent comparison at a preset period, and notifying a logic control unit through serial port communication when the comparison results of all the images are consistent again;

the logic control unit receives the result that the comparison is normal, and the execution process (6) switches the system state to the SS10 normal state and notifies the bridging unit through the serial port protocol; the bridge unit stops the process (7)

As shown in fig. 7, the indicator lamp to be checked in the present application may be defined by software and stored in a storage unit in advance, and the configuration of the display content to be compared with the pixels may be performed by the following steps, which mainly uses the brush-write function of the CAN to update the content of the storage unit, and the flow is as follows:

(1) The logic control unit enters a refreshing mode through the CAN signal and receives a configuration file of the storage unit;

(2) The logic control unit sends an instruction for erasing and storing the storage unit through serial port communication with the bridging unit;

(3) The bridging unit forwards the erasing instruction to the storage unit;

(4) The memory cell executes an erase command;

(5) After the memory cell is erased, notifying the bridge unit through serial communication;

(6) The bridging unit forwards the successful erasure state to the logic control unit;

(7) The logic control unit sends the configuration file and forwards the configuration file to the storage unit through the bridging unit.

It is obvious that the specific implementation of the present application is not limited by the above-mentioned modes, and that it is within the scope of protection of the present application only to adopt various insubstantial modifications made by the method conception and technical scheme of the present application.

Claims

1. The utility model provides a promote on-vehicle instrument display system of reliability which characterized in that: the device comprises a video loop, a CAN loop, a verification processing unit and a display unit, wherein the video loop is configured to receive and deserialize an input video signal, the CAN loop is configured to parse a state signal corresponding to an indicator lamp to be verified based on the input CAN signal, the verification processing unit is configured to verify the deserialized video signal based on the parsed state signal corresponding to the indicator lamp to be verified, and the video data after the verification processing is sent to the display unit for instrument display.

2. The vehicle instrument display system of claim 1, wherein the reliability is enhanced by: the video loop comprises a video receiving unit which is used for receiving a video signal required by instrument display, deserializing the video signal and sending the video signal to a verification processing unit.

3. The vehicle instrument display system of claim 1, wherein the reliability is enhanced by: the CAN loop comprises a CAN signal receiving unit and a logic control unit, wherein the CAN signal receiving unit is used for accessing a whole CAN network to obtain a whole CAN signal and sending the CAN signal into the logic control unit; the logic control unit is used for analyzing out the state data required by the verification and forwarding the state data to the verification control unit.

4. A vehicle instrument display system of enhanced reliability as claimed in any one of claims 1-3 wherein: the verification processing unit comprises a bridging unit and a storage unit, wherein the bridging unit is respectively connected with the video receiving unit, the logic control unit and the storage unit; wherein:

5. A vehicle-mounted instrument display method for improving reliability is characterized in that: analyzing the state information of the indicator lamp to be checked based on the CAN signal; acquiring corresponding image information for verification based on the state information of the indicator lamp;

6. The vehicle-mounted instrument display method for improving reliability according to claim 5, wherein: the verification process comprises the following steps:

7. The vehicle-mounted instrument display method for improving reliability according to claim 6, wherein:

8. The vehicle-mounted instrument display method for improving reliability according to claim 6, wherein:

9. The vehicle-mounted instrument display method for improving reliability according to claim 6, wherein:

10. The method for displaying an on-vehicle meter for improving reliability according to any one of claims 5 to 9, wherein: