CN114771251A - Liquid crystal instrument display method and device - Google Patents

Liquid crystal instrument display method and device Download PDF

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Publication number
CN114771251A
CN114771251A CN202210614972.4A CN202210614972A CN114771251A CN 114771251 A CN114771251 A CN 114771251A CN 202210614972 A CN202210614972 A CN 202210614972A CN 114771251 A CN114771251 A CN 114771251A
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China
Prior art keywords
liquid crystal
crystal instrument
display screen
processing unit
display
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CN202210614972.4A
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Chinese (zh)
Inventor
谢修森
边少君
贾伟清
李�浩
周清
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South Sagittarius Integration Co Ltd
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South Sagittarius Integration Co Ltd
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Priority to CN202210614972.4A priority Critical patent/CN114771251A/en
Publication of CN114771251A publication Critical patent/CN114771251A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K35/00—Instruments specially adapted for vehicles; Arrangement of instruments in or on vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K35/00—Instruments specially adapted for vehicles; Arrangement of instruments in or on vehicles
    • B60K35/20—Output arrangements, i.e. from vehicle to user, associated with vehicle functions or specially adapted therefor
    • B60K35/21—Output arrangements, i.e. from vehicle to user, associated with vehicle functions or specially adapted therefor using visual output, e.g. blinking lights or matrix displays
    • B60K35/22—Display screens
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K35/00—Instruments specially adapted for vehicles; Arrangement of instruments in or on vehicles
    • B60K35/20—Output arrangements, i.e. from vehicle to user, associated with vehicle functions or specially adapted therefor
    • B60K35/28—Output arrangements, i.e. from vehicle to user, associated with vehicle functions or specially adapted therefor characterised by the type of the output information, e.g. video entertainment or vehicle dynamics information; characterised by the purpose of the output information, e.g. for attracting the attention of the driver
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K35/00—Instruments specially adapted for vehicles; Arrangement of instruments in or on vehicles
    • B60K35/80—Arrangements for controlling instruments
    • B60K35/81—Arrangements for controlling instruments for controlling displays
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K35/00—Instruments specially adapted for vehicles; Arrangement of instruments in or on vehicles
    • B60K35/85—Arrangements for transferring vehicle- or driver-related data
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K2360/00—Indexing scheme associated with groups B60K35/00 or B60K37/00 relating to details of instruments or dashboards
    • B60K2360/16—Type of output information
    • B60K2360/167—Vehicle dynamics information
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K2360/00—Indexing scheme associated with groups B60K35/00 or B60K37/00 relating to details of instruments or dashboards
    • B60K2360/583—Data transfer between instruments

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

The application relates to a liquid crystal instrument display method and a device, which relate to the technical field of instrument display testing, and the method comprises the following steps: when the liquid crystal instrument display screen works normally, image display is carried out by utilizing the image information corresponding to the liquid crystal instrument display screen based on the CAN communication information; responding to abnormal error reporting information or abnormal watchdog signal information corresponding to a display screen of the liquid crystal instrument by using a preset co-processing unit, and receiving CAN communication information; based on the CAN communication information, the co-processing unit replaces a liquid crystal instrument display screen and receives image information corresponding to the CAN communication information; and the co-processing unit displays corresponding instrument information based on the image information. This application can monitor various abnormal signal, under the prerequisite that does not influence normal driving, in time shows replacement work and instrument display screen and restarts work, effectively ensures the fail safe nature of driving.

Description

Liquid crystal instrument display method and device
Technical Field
The application relates to the technical field of instrument display testing, in particular to a liquid crystal instrument display method and device.
Background
Because the safety level of the instrument in the automobile is high, the instrument is required to display relevant fault information in time when serious automobile body faults occur in the running process of the automobile, and therefore the instrument is required to have a backup mechanism, even if a system of the instrument system breaks down, the instrument system can detect the faults in time, and activates a coprocessor connecting pipe display screen to display fault icons and inform a driver of stopping the automobile to remove the faults in time.
The current implementation is as follows: and a mode that a full-function display system and an auxiliary display system coexist is adopted. The full-function display system is a system which is operated when the instrument has no fault, the auxiliary display system is functionally represented in that the full-function display system can replace part of functions of the full-function display system when the instrument has the fault, displays some basic information such as indicator lights, alarms and the like, and informs drivers to stop for fault treatment.
The full-function display system keeps a plurality of graphic kernel backup systems in the system, and when one system kernel has a problem, the system can be switched to the kernel system of the backup. If the problem still exists when the kernel system is switched to the backup kernel system, the auxiliary display system can be called to display some simple emergency information. After the auxiliary display system is switched, the driver is prompted to stop and restart the vehicle, and then the vehicle reenters the full-function display system.
The system structure of traditional technical means is complicated, implements loaded down with trivial details, and needs the driver to park and restart the vehicle just can realize the work of restarting of instrument display screen, brings inconvenience for daily driving.
Therefore, a liquid crystal instrument display technology is provided to meet the current use requirement.
Disclosure of Invention
The application provides a liquid crystal instrument display method and device, the software system is simple in structure, various abnormal signals can be monitored, display replacement work and instrument display screen restarting work can be timely carried out on the premise that normal driving is not affected, and driving safety and reliability are effectively guaranteed.
In a first aspect, the present application provides a method for displaying a liquid crystal instrument, the method comprising the steps of:
when the liquid crystal instrument display screen works normally, image display is carried out by utilizing the image information corresponding to the liquid crystal instrument display screen based on the CAN communication information;
responding to abnormal error reporting information or abnormal watchdog signal information corresponding to a display screen of the liquid crystal instrument by using a preset co-processing unit, and receiving CAN communication information;
based on the CAN communication information, the co-processing unit replaces a liquid crystal instrument display screen and receives image information corresponding to the CAN communication information;
and the co-processing unit displays corresponding instrument information based on the image information.
Further, the method comprises the following steps:
when the liquid crystal instrument display screen works normally, receiving the CAN communication information and generating corresponding image information;
and storing the image information into a corresponding display cache, and sending the image information to the liquid crystal instrument display screen for displaying.
Further, the method comprises the following steps:
receiving image information corresponding to the CAN communication information;
and detecting the image information, and generating the display abnormality error reporting information when abnormality is judged.
Further, the method comprises the following steps:
and the co-processing unit responds to the watchdog signal abnormal information corresponding to the liquid crystal instrument display screen and sends a reset instruction to the liquid crystal instrument display screen.
Further, after the co-processing unit responds to the watchdog signal abnormal information corresponding to the liquid crystal instrument display screen and sends a reset instruction to the liquid crystal instrument display screen, the method further comprises the following steps:
resetting the display screen of the liquid crystal instrument and recovering the normal working state;
and the co-processing unit stops receiving the image information corresponding to the CAN communication information.
In a second aspect, the present application provides a liquid crystal instrument display device, the device comprising:
the liquid crystal instrument display screen is used for displaying images based on the image information corresponding to the CAN communication information;
the co-processing unit is used for responding to abnormal error reporting information or abnormal watchdog signal information displayed correspondingly on a display screen of the liquid crystal instrument and receiving CAN communication information;
the coprocessing unit is also used for replacing a liquid crystal instrument display screen and receiving image information corresponding to the CAN communication information based on the CAN communication information;
and the co-processing unit is also used for displaying corresponding instrument information based on the image information.
Further, the apparatus further comprises:
the full-liquid crystal instrument processing unit is used for receiving the CAN communication information and generating corresponding image information when the liquid crystal instrument display screen works normally;
and the full liquid crystal instrument processing unit is also used for storing the image information into a corresponding display cache and sending the image information to the liquid crystal instrument display screen for displaying.
Further, the apparatus further comprises:
the safety display module unit is used for receiving image information corresponding to the CAN communication information;
the safety display module unit is also used for detecting the image information and generating the abnormal display error reporting information when the abnormal display is judged.
Furthermore, the co-processing unit is further configured to respond to watchdog signal abnormality information corresponding to a display screen of the liquid crystal instrument, and send a reset instruction to the display screen of the liquid crystal instrument.
Further, the co-processing unit is further configured to stop receiving the image information corresponding to the CAN communication information when the liquid crystal instrument display screen is reset and returns to a normal working state.
The technical scheme who provides this application brings beneficial effect includes:
the software system is simple in structure, can monitor various abnormal signals, and can display replacement work and restart the instrument display screen in time on the premise of not influencing normal driving, so that the driving safety and reliability are effectively guaranteed.
Drawings
Interpretation of terms:
CAN: controller Area Network, Controller Area Network;
LVDS: Low-Voltage Differential Signaling, Low Voltage Differential signal;
a CPU: central Processing Unit, Central processor.
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a flowchart illustrating steps of a method for displaying a liquid crystal instrument provided in an embodiment of the present application;
fig. 2 is a schematic structural diagram corresponding to a liquid crystal instrument display method and a step flow chart device of the liquid crystal instrument display method provided in the embodiment of the present application;
fig. 3 is a block diagram of a liquid crystal instrument display device provided in an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
The embodiment of the application provides a liquid crystal instrument display method and device, the software system is simple in structure, various abnormal signals can be monitored, display replacement work and instrument display screen restarting work can be timely carried out on the premise that normal driving is not affected, and driving safety and reliability are effectively guaranteed.
In order to achieve the technical effects, the general idea of the application is as follows:
a liquid crystal instrument display method comprises the following steps:
s1, when the liquid crystal instrument display screen works normally, image information corresponding to the CAN communication information is used for displaying images by the liquid crystal instrument display screen;
s2, responding to abnormal error reporting information or abnormal watchdog signal information corresponding to a liquid crystal instrument display screen by using a preset co-processing unit, and receiving CAN communication information;
s3, based on the CAN communication information, the co-processing unit replaces a liquid crystal instrument display screen and receives image information corresponding to the CAN communication information;
and S4, the co-processing unit displays corresponding meter information based on the image information.
Embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
In a first aspect, referring to fig. 1 to 2, an embodiment of the present application provides a display method for a liquid crystal instrument, including the following steps:
s1, when the liquid crystal instrument display screen works normally, the liquid crystal instrument display screen is used for displaying images based on image information corresponding to the CAN communication information;
s2, responding to abnormal error reporting information or abnormal watchdog signal information corresponding to a liquid crystal instrument display screen by using a preset co-processing unit, and receiving CAN communication information;
s3, based on the CAN communication information, the co-processing unit replaces a liquid crystal instrument display screen and receives image information corresponding to the CAN communication information;
and S4, the co-processing unit displays corresponding meter information based on the image information.
It should be noted that, the embodiments of the present application can at least address the following technical problems in the conventional technical means:
when the display signal is abnormal, the image display interface is frozen, the video frame is inconsistent with the original frame, and the like, the related faults are displayed, the conventional instrument system cannot detect the faults of the safety display class, and only can detect whether the kernel and the application program of the instrument system operate normally or not;
at present, most instruments adopt a mode of backup of a plurality of display kernels, and when one graph kernel is broken down, the mode of calling the backup graph display kernel is used for restoring the display of the instrument, so that the software design is complex, and an instrument screen does not display when the backup graph display kernel is started;
when the auxiliary display system is switched to, the instrument system cannot be restarted in a soft mode, a driver can only be prompted to stop to restart the vehicle, and the whole instrument system can be reset after power off, so that a normal interface can be recovered.
In view of the above technical problems, according to the technical scheme of the embodiment of the application, on one hand, when the instrument is in an abnormal state, the backup system can quickly replace the instrument system to display, since the graphic display kernel does not need to be reloaded, the problem that the instrument screen does not display during the period of starting the backup graphic display kernel does not occur, and meanwhile, under the condition that the display is not affected during the period of replacing the instrument system to display, the instrument system can be soft restarted, and then the instrument system is reinitialized to be restored to the previous normal state;
on the other hand, when the display signal of the liquid crystal instrument system is abnormal, the image display interface is frozen, the video frame is inconsistent with the original frame, and the like, the related faults can be displayed, the instrument system can be detected, if the faults are judged to exist continuously, the instrument system can be restarted in a soft mode after the backup system takes over, and then the instrument system is reinitialized to be restored to the normal state.
In the embodiment of the application, the software system is simple in structure, various abnormal signals can be monitored, replacement work and restarting work of the instrument display screen can be displayed in time on the premise that normal driving is not influenced, and driving safety and reliability are effectively guaranteed.
Further, the method also comprises the following steps:
when the liquid crystal instrument display screen works normally, receiving the CAN communication information and generating corresponding image information;
and storing the image information into a corresponding display cache, and sending the image information to the liquid crystal instrument display screen for displaying.
Further, the method comprises the following steps:
receiving image information corresponding to the CAN communication information;
and detecting the image information, and generating the display abnormality error reporting information when abnormality is judged.
Further, the method comprises the following steps:
and the co-processing unit responds to the watchdog signal abnormal information corresponding to the liquid crystal instrument display screen and sends a reset instruction to the liquid crystal instrument display screen.
Further, after the co-processing unit responds to the watchdog signal abnormal information corresponding to the liquid crystal instrument display screen and sends a reset instruction to the liquid crystal instrument display screen, the method further comprises the following steps:
resetting the display screen of the liquid crystal instrument and recovering the normal working state;
and the co-processing unit stops receiving the image information corresponding to the CAN communication information.
It should be noted that, when the method is implemented in practice, the method may be based on a liquid crystal instrument display device, and when the system is implemented in practice, as shown in fig. 2, the system may include an R5 co-processing unit, an all-liquid crystal instrument processing unit, a safety display module unit, and an all-liquid crystal instrument display unit;
when the R5 co-processing unit detects no watchdog signal and a failure signal of the safety display module unit, the R5 co-processing unit can rapidly detect the signals and trigger an instrument display process to replace a full liquid crystal instrument system for displaying, and simultaneously judges whether the full liquid crystal instrument system needs to be reset and reset, when the full liquid crystal instrument system needs to be reset, the signal sent by a vehicle body can be normally received during the period, and the image information of the instrument is displayed on the full liquid crystal instrument display screen unit in time.
Specifically, in the liquid crystal instrument display device, the functions of each module are explained as follows:
r5 co-processing unit: the method comprises a state evaluation process, an instrument display process and an R5 external communication process;
the state evaluation process is mainly used for detecting abnormal error reporting of the safety display module unit, such as abnormal display signals, frozen image display interfaces and inconsistent video frames and original frames;
the instrument display process is mainly used for replacing a full liquid crystal instrument processing unit to display some key information of the instrument when a watchdog signal of an instrument system is abnormal;
and the R5 external communication process is mainly used for receiving CAN communication information sent by the vehicle body when the liquid crystal instrument system has a fault.
The full liquid crystal instrument processing unit: the method comprises a display control module and an external communication process of the instrument;
the display control module is used for applying for display cache, writing the instrument image data into the display cache, and then displaying an instrument image interface to the full liquid crystal instrument display screen unit through the safety display module unit;
the external communication process of the instrument is mainly used for receiving and processing CAN communication information sent by a vehicle body when the instrument normally operates, and generating image information to be displayed on a full liquid crystal instrument display screen unit.
A secure display module unit: the image layer mixing module and the image detection module are included;
the layer mixing module is used for receiving the image data sent by the full liquid crystal instrument processing unit or the R5 coprocessing unit, and only receiving the image data of one of the full liquid crystal instrument processing unit and the R5 coprocessing unit at the same time;
and the image detection module is used for carrying out security and integrity detection on the image, and informing a state evaluation process in the R5 co-processing unit when an exception is detected, so as to trigger a security protection mechanism.
Full liquid crystal instrument display unit: the unit receives the LVDS digital signals sent by the safety display module and finally displays an image interface of the instrument on the liquid crystal display screen.
In addition, based on the hardware basis, at least the following technical features need to be realized:
when the kernel of the system runs fast when the processing unit of the full liquid crystal instrument runs, and the graphic display program cannot be displayed normally, the R5 co-processing unit can detect a watchdog fault signal and start the R5 co-processing unit to replace the full liquid crystal instrument system to display in time, so that the display interface is ensured to be switched quickly, and the transient display interface loss cannot occur;
the safety display module unit can detect the problems which cannot be detected by the traditional instrument system, such as abnormal display signals, frozen image display interface, inconsistent video frame and original frame and the like, and the traditional instrument system can only detect whether the instrument system operates normally or not, cannot detect the display problems and has no graphic data verification mechanism;
due to the adoption of the heterogeneous CPU design, chip resources are divided into the R5 co-processing unit and the full liquid crystal instrument system unit, the R5 co-processing unit can send a soft reset instruction to reset the full liquid crystal instrument system unit, and the display of the graphical interface of the full liquid crystal instrument display unit cannot be influenced during the reset period.
The liquid crystal instrument display device operates as follows:
1. when the system is started, the heterogeneous multi-core processor firstly guides the R5 co-processing unit to operate, then the system of the full liquid crystal instrument processing unit operates, and the two systems operate on respective hardware resources according to the division of CPU resources;
after both systems are successfully operated, the R5 co-processing unit creates a process of detecting a watchdog signal of the full liquid crystal instrument system, and then the R5 co-processing unit system is in a state of waiting for an abnormal signal.
2. In a normal state, the full liquid crystal instrument system acquires CAN message information of the vehicle body through an instrument external communication process, and after the message information is filtered and processed, the display control module of the full liquid crystal instrument processing unit sends graphic data to the safety display module unit for processing and displaying.
3. When the R5 co-processing unit detects that the watchdog signal is abnormal, the two processes of the meter display process in the R5 co-processing unit and the R5 external communication are activated to run;
the R5 external communication process is responsible for receiving CAN message information of the vehicle body, searching corresponding image information according to a protocol and acquiring a corresponding graphical interface;
the instrument display process writes the graphic data into the cache of the safety display module unit through the data bus in the CPU, and meanwhile, the R5 co-processing unit controls the safety display unit to stop receiving the graphic data input by the all-liquid crystal instrument processing unit through the CPU bus.
4. When the R5 co-processing unit continuously detects the watchdog signal abnormality, the R5 co-processing unit sends a system reset command to reset the full liquid crystal instrument processing unit.
5. The full liquid crystal instrument system is subjected to soft reset, the distributed hardware resources are reset, the kernel and the graphical display interface are loaded again, and a boot loader bootstrap program can reinitialize the hardware register of the full liquid crystal instrument system during the reset period, so that the normal operation of the R5 co-processing unit program cannot be influenced;
when the reset is completed, the processing unit of the full liquid crystal instrument is in a normal working state, and at the moment, a request signal is sent to the R5 co-processing unit to request to take over the display of the display screen unit of the full liquid crystal instrument again;
the instrument display process in the R5 co-processing unit stops outputting the image data, the R5 external communication process stops receiving the CAN message, and the safety display module is controlled to receive the graphic data of the full liquid crystal instrument system unit;
finally, the R5 synergistic processing unit system is again in a state of waiting for an exception signal.
6. When the full-liquid crystal instrument processing unit operates, an image is output to the safety display module, when an image detection module in the safety display module detects graphic data errors, such as display signal abnormity, image display interface freezing and video frame inconsistency and other faults, a state evaluation process in the R5 co-processing unit is triggered, the process can acquire the abnormal state of the safety display module through a bus of a CPU (central processing unit), and then whether an abnormal processing flow is entered is judged;
if the fault continuously occurs, the soft reset process is carried out on the full liquid crystal instrument system.
Based on the above description, the technical solution of the embodiment of the present application at least includes the following technical advantages:
the heterogeneous CPU is adopted for hardware resource allocation, a single graphic processing kernel mode is adopted, and software does not need to design a complex standby graphic processing kernel and an abnormal processing flow;
when the kernel of the full liquid crystal instrument unit is abnormal and the watchdog signal is abnormal, the full liquid crystal instrument system unit can be restarted to recover to a normal display interface after the R5 coprocessor takes over the full liquid crystal instrument display screen unit, instead of only displaying partial fault icons and alarm information through the coprocessor;
the detection of display faults, such as video signal abnormity, image display interface freezing, inconsistency of a video frame and an original frame and other display related problems are increased. However, the approaching prior art can only detect the problems of system kernel running, system non-response and the like, and can not detect display related faults
And the CPU does not need to be reset by an external monitoring unit, so that the cost is reduced.
In a second aspect, referring to fig. 2 to 3, an embodiment of the present invention provides a liquid crystal instrument display device based on the technology of the liquid crystal instrument display method mentioned in the first aspect, the device including:
the liquid crystal instrument display screen is used for displaying images based on the image information corresponding to the CAN communication information;
the co-processing unit is used for responding to abnormal error reporting information or abnormal watchdog signal information displayed correspondingly on a display screen of the liquid crystal instrument and receiving CAN communication information;
the co-processing unit is also used for replacing a liquid crystal instrument display screen and receiving image information corresponding to the CAN communication information based on the CAN communication information;
and the co-processing unit is also used for displaying corresponding instrument information based on the image information.
It should be noted that, the embodiments of the present application can at least address the following technical problems in the conventional technical means:
when the display signal is abnormal, the image display interface is frozen, the video frame is inconsistent with the original frame, and the like, the related faults are displayed, the conventional instrument system cannot detect the faults of the safety display class and only can detect whether the kernel and the application program of the instrument system operate normally or not;
at present, most instruments adopt a mode of backup of a plurality of display kernels, and when one graph kernel is broken down, the mode of calling the backup graph display kernel is used for restoring the display of the instrument, so that the software design is complex, and an instrument screen does not display when the backup graph display kernel is started;
when the auxiliary display system is switched to, the instrument system cannot be soft restarted, and only a driver is prompted to stop to restart the vehicle, and the whole instrument system is reset after power-off, so that a normal interface can be recovered.
In view of the above technical problems, according to the technical scheme of the embodiment of the application, on one hand, when the instrument is in an abnormal state, the backup system can quickly replace the instrument system to display, since the graphic display kernel does not need to be reloaded, the problem that the instrument screen does not display during the period of starting the backup graphic display kernel does not occur, and meanwhile, under the condition that the display is not affected during the period of replacing the instrument system to display, the instrument system can be soft restarted, and then the instrument system is reinitialized to be restored to the previous normal state;
on the other hand, when the display signal of the liquid crystal instrument system is abnormal, the image display interface is frozen, the video frame is inconsistent with the original frame, and the like, the related faults can be displayed, the instrument system can be detected, if the faults are judged to exist continuously, the instrument system can be restarted in a soft mode after the backup system takes over, and then the instrument system is initialized again and is restored to the normal state.
In the embodiment of the application, the software system is simple in structure, various abnormal signals can be monitored, replacement work and restarting work of the instrument display screen can be displayed in time on the premise that normal driving is not influenced, and driving safety and reliability are effectively guaranteed.
Further, the apparatus further comprises:
the full liquid crystal instrument processing unit is used for receiving the CAN communication information and generating corresponding image information when the liquid crystal instrument display screen works normally;
and the full liquid crystal instrument processing unit is also used for storing the image information into a corresponding display cache and sending the image information to the liquid crystal instrument display screen for display.
Further, the apparatus further comprises:
the safety display module unit is used for receiving image information corresponding to the CAN communication information;
the safety display module unit is also used for detecting the image information and generating the display abnormity error reporting information when abnormity is judged.
Furthermore, the co-processing unit is further configured to respond to watchdog signal abnormality information corresponding to a liquid crystal instrument display screen, and send a reset instruction to the liquid crystal instrument display screen.
Further, the co-processing unit is further configured to stop receiving the image information corresponding to the CAN communication information when the liquid crystal instrument display screen is reset and returns to a normal working state.
It should be noted that, when the method is implemented, the method may be based on a liquid crystal instrument display device, and when the system is implemented actually, as shown in fig. 2, the system may include an R5 co-processing unit, an all-liquid crystal instrument processing unit, a safety display module unit, and an all-liquid crystal instrument display unit;
when the R5 co-processing unit detects no watchdog signal and a failure signal of the safety display module unit, the R5 co-processing unit can rapidly detect the signals and trigger an instrument display process to replace a full liquid crystal instrument system for displaying, and simultaneously judges whether the full liquid crystal instrument system needs to be reset and reset, when the full liquid crystal instrument system needs to be reset, the signal sent by a vehicle body can be normally received during the period, and the image information of the instrument is displayed on the full liquid crystal instrument display screen unit in time.
Specifically, in the liquid crystal instrument display device, the functions of each module are explained as follows:
r5 co-processing unit: the method comprises a state evaluation process, an instrument display process and an R5 external communication process;
the state evaluation process is mainly used for detecting abnormal error reporting of the safety display module unit, such as display signal abnormality, image display interface freezing, and inconsistency of a video frame and an original frame;
the instrument display process is mainly used for replacing a full liquid crystal instrument processing unit to display some key information of the instrument when a watchdog signal of an instrument system is abnormal;
and the R5 external communication process is mainly responsible for receiving CAN communication information sent by the vehicle body when the liquid crystal instrument system fails.
The full liquid crystal instrument processing unit: the method comprises a display control module and an external communication process of the instrument;
the display control module is used for applying for display cache, writing the instrument image data into the display cache, and then displaying an instrument image interface to the full liquid crystal instrument display screen unit through the safety display module unit;
the external communication process of the instrument is mainly used for receiving and processing CAN communication information sent by a vehicle body when the instrument normally operates, and generating image information to be displayed on a full liquid crystal instrument display screen unit.
A secure display module unit: the image layer mixing module and the image detection module are included;
the image layer mixing module is used for receiving the image data sent by the full liquid crystal instrument processing unit or the R5 co-processing unit, and only receiving the image data of one of the full liquid crystal instrument processing unit and the R5 co-processing unit at the same time;
and the image detection module is used for carrying out security and integrity detection on the image, and informing a state evaluation process in the R5 coprocessing unit when an exception is detected, so as to trigger a security protection mechanism.
Full liquid crystal instrument display unit: the unit receives the LVDS digital signals sent by the safety display module and finally displays an image interface of the instrument on the liquid crystal display screen.
In addition, based on the hardware basis, at least the following technical features need to be realized:
when the kernel of the system runs fast when the processing unit of the full liquid crystal instrument runs, and the graphic display program cannot be displayed normally, the R5 co-processing unit can detect a watchdog fault signal and start the R5 co-processing unit to replace the full liquid crystal instrument system to display in time, so that the display interface is ensured to be switched quickly, and the transient display interface loss cannot occur;
the safety display module unit can detect the problems which cannot be detected by the traditional instrument system, such as abnormal display signals, frozen image display interface, inconsistent video frames and original frames and the like, and the traditional instrument system can only detect whether the instrument system operates normally and cannot detect the display problems and does not have a graphic data checking mechanism;
due to the adoption of the heterogeneous CPU design, chip resources are divided into the R5 coprocessing unit and the full liquid crystal instrument system unit, the R5 coprocessing unit can send a soft reset instruction to reset the full liquid crystal instrument system unit, and the display of a graphical interface of the full liquid crystal instrument display unit cannot be influenced during the reset period.
The liquid crystal instrument display device operates as follows:
1. when the system is started, the heterogeneous multi-core processor firstly guides the R5 co-processing unit to operate, then the system of the full liquid crystal instrument processing unit operates, and the two systems operate on respective hardware resources according to the division of CPU resources;
after both systems are successfully operated, the R5 co-processing unit creates a process of detecting a watchdog signal of the full liquid crystal instrument system, and then the R5 co-processing unit system is in a state of waiting for an abnormal signal.
2. In a normal state, the full-liquid crystal instrument system acquires CAN message information of the vehicle body through an instrument external communication process, and after the message information is filtered and processed, the display control module of the full-liquid crystal instrument processing unit sends graphic data to the safety display module unit for processing and displaying.
3. When the R5 co-processing unit detects that the watchdog signal is abnormal, the two processes of the meter display process in the R5 co-processing unit and the R5 external communication are activated to run;
the R5 external communication process is responsible for receiving CAN message information of the vehicle body, searching corresponding image information according to a protocol and acquiring a corresponding graphical interface;
the instrument display process writes the graphic data into the cache of the safe display module unit through the data bus in the CPU, and meanwhile, the R5 co-processing unit controls the safe display unit to stop receiving the graphic data input by the all-liquid crystal instrument processing unit through the CPU bus.
4. When the R5 co-processing unit continuously detects the watchdog signal abnormality, the R5 co-processing unit sends a system reset command to reset the full liquid crystal instrument processing unit.
5. The full liquid crystal instrument system is subjected to soft reset, the distributed hardware resources are reset, the kernel and the graphical display interface are loaded again, and a boot loader bootstrap program can reinitialize the hardware register of the full liquid crystal instrument system during the reset period, so that the normal operation of the R5 co-processing unit program cannot be influenced;
when the reset is completed, the processing unit of the full liquid crystal instrument is in a normal working state, and at the moment, a request signal is sent to the R5 co-processing unit to request to take over the display of the display screen unit of the full liquid crystal instrument again;
the instrument display process in the R5 co-processing unit stops outputting the image data, the R5 external communication process stops receiving the CAN message, and simultaneously the safety display module is controlled to receive the graphic data of the full liquid crystal instrument system unit;
finally, the R5 synergistic processing unit system is again in a state of waiting for an exception signal.
6. When the processing unit of the full liquid crystal instrument operates, an image is output to the safety display module, when an image detection module in the safety display module detects that graphic data is wrong, such as display signal abnormity, freezing of an image display interface, inconsistency of a video frame and an original frame and other faults, a state evaluation process in the R5 co-processing unit is triggered, the process can acquire the abnormal state of the safety display module through a bus of a CPU (Central processing Unit), and then whether an abnormal processing flow is entered is judged;
if the fault continuously occurs, the soft reset process is carried out on the full liquid crystal instrument system.
Based on the above description, the technical solution of the embodiment of the present application at least includes the following technical advantages:
the heterogeneous CPU is adopted for hardware resource allocation, a single graphic processing kernel mode is adopted, and software does not need to design a complex standby graphic processing kernel and an abnormal processing flow;
when the kernel of the full liquid crystal instrument unit is abnormal and the watchdog signal is abnormal, the full liquid crystal instrument system unit can be restarted to recover to a normal display interface after the R5 coprocessor takes over the full liquid crystal instrument display screen unit, instead of only displaying partial fault icons and alarm information through the coprocessor;
the problems related to display such as abnormal video signals, frozen image display interface, inconsistent video frames and original frames and the like are solved. However, the approaching prior art can only detect the problems of system kernel running, system non-response and the like, and can not detect display related faults
And an external monitoring unit is not needed to reset the CPU, so that the cost is reduced.
It is noted that, in the present application, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.
The above are merely exemplary embodiments of the present application and are intended to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A liquid crystal instrument display method is characterized by comprising the following steps:
when the liquid crystal instrument display screen works normally, image display is carried out by utilizing the image information corresponding to the liquid crystal instrument display screen based on the CAN communication information;
responding display abnormal error reporting information or watchdog signal abnormal information corresponding to a display screen of the liquid crystal instrument by using a preset co-processing unit, and receiving CAN communication information;
based on the CAN communication information, the co-processing unit replaces a liquid crystal instrument display screen and receives image information corresponding to the CAN communication information;
and the co-processing unit displays corresponding instrument information based on the image information.
2. The liquid crystal meter display method of claim 1, further comprising the steps of:
when the liquid crystal instrument display screen works normally, receiving the CAN communication information and generating corresponding image information;
and storing the image information into a corresponding display cache, and sending the image information to the liquid crystal instrument display screen for displaying.
3. The liquid crystal instrument display method of claim 1, further comprising the steps of:
receiving image information corresponding to the CAN communication information;
and detecting the image information, and generating the display abnormality error reporting information when abnormality is judged.
4. The liquid crystal instrument display method of claim 1, further comprising the steps of:
and the co-processing unit responds to the watchdog signal abnormal information corresponding to the liquid crystal instrument display screen and sends a reset instruction to the liquid crystal instrument display screen.
5. The method for displaying the liquid crystal instrument as claimed in claim 4, wherein the co-processing unit sends a reset command to the liquid crystal instrument display screen in response to the watchdog signal abnormality information corresponding to the liquid crystal instrument display screen, and the method further comprises the following steps:
resetting the display screen of the liquid crystal instrument and recovering the normal working state;
and the co-processing unit stops receiving the image information corresponding to the CAN communication information.
6. A liquid crystal instrument display device, the device comprising:
the liquid crystal instrument display screen is used for displaying images based on the image information corresponding to the CAN communication information;
the co-processing unit is used for responding to abnormal error reporting information or abnormal watchdog signal information displayed correspondingly on a display screen of the liquid crystal instrument and receiving CAN communication information;
the co-processing unit is also used for replacing a liquid crystal instrument display screen and receiving image information corresponding to the CAN communication information based on the CAN communication information;
and the co-processing unit is also used for displaying corresponding instrument information based on the image information.
7. The liquid crystal instrument display device of claim 6, further comprising:
the full liquid crystal instrument processing unit is used for receiving the CAN communication information and generating corresponding image information when the liquid crystal instrument display screen works normally;
and the full liquid crystal instrument processing unit is also used for storing the image information into a corresponding display cache and sending the image information to the liquid crystal instrument display screen for display.
8. The liquid crystal meter display device of claim 6, wherein the device further comprises:
the safety display module unit is used for receiving image information corresponding to the CAN communication information;
the safety display module unit is also used for detecting the image information and generating the display abnormity error reporting information when abnormity is judged.
9. The liquid crystal instrument display device of claim 8, wherein:
and the co-processing unit is also used for responding to the watchdog signal abnormal information corresponding to the liquid crystal instrument display screen and sending a reset instruction to the liquid crystal instrument display screen.
10. The liquid crystal instrument display device of claim 6, wherein:
and the co-processing unit is also used for stopping receiving the image information corresponding to the CAN communication information when the liquid crystal instrument display screen is reset and recovers to a normal working state.
CN202210614972.4A 2022-05-31 2022-05-31 Liquid crystal instrument display method and device Pending CN114771251A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210614972.4A CN114771251A (en) 2022-05-31 2022-05-31 Liquid crystal instrument display method and device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210614972.4A CN114771251A (en) 2022-05-31 2022-05-31 Liquid crystal instrument display method and device

Publications (1)

Publication Number Publication Date
CN114771251A true CN114771251A (en) 2022-07-22

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210614972.4A Pending CN114771251A (en) 2022-05-31 2022-05-31 Liquid crystal instrument display method and device

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Country Link
CN (1) CN114771251A (en)

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