CN110979208A - Vehicle-mounted intelligent information terminal - Google Patents
Vehicle-mounted intelligent information terminal Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
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Abstract
The embodiment of the invention provides a vehicle-mounted intelligent information terminal, which collects signals of a vehicle power CAN and a vehicle body CAN bus through a CAN circuit, under the auxiliary cooperation of a Microprocessor (MCU) unit, a Central Processing Unit (CPU) processes power supply data, engine rotating speed data, instantaneous oil consumption data, gear data, vehicle speed data, 6-axis gyroscope data and brake data of a vehicle, and analyzes the data by adopting embedded data, a driving chart analyzes driving behaviors and provides guidance instructions for advising optimization of the driving behaviors; and simultaneously, the air conditioner, the light, the door switch and the glass lifting control of the whole vehicle are controlled by combining the CAN data of the whole vehicle with voice recognition. On one hand, the data are visually displayed and provided with a diagnostic instrument for historical fault detection, on the other hand, the data are provided for a service information platform through a 4G network for vehicle abnormal state monitoring and spare part set providing according to data analysis.
Description
Technical Field
The embodiment of the invention relates to the technical field of automobile electronic control, in particular to a vehicle-mounted intelligent information terminal.
Background
With the rapid development of the automobile industry in China, the automobile industry enters an electronic and intelligent control era and tends to the integrated development of electronic components; the comprehensive system integrates functions of environment perception, planning decision, audio-visual entertainment, positioning, communication service, multi-level auxiliary driving and the like; the intelligent automobile safety protection system has the advantages that technologies such as computers, modern sensing, information fusion, communication, artificial intelligence and automatic control are intensively applied, the safety and the comfort of automobiles are improved, and excellent human-vehicle interaction interfaces, intelligent driving systems, life service systems, safety protection systems, position service systems, automobile service systems and the like are provided, so that the functions and the systems of the automobiles are mature and expected.
The trend that the intelligent control and electronic development of the whole automobile are continuously improved and the market competition is intensified, the full play of electronization, intellectualization and safety can be met by adopting an integrated control technology, the assembly and the electric compatibility of separated parts of the whole automobile are solved, and the direction of the prior development of the automobile electronics in China is provided. The automobile electronic integration solution integrates the traditional telephone, positioning, navigation, real-time traffic information, remote fault diagnosis, vehicle anti-theft, audio-visual entertainment, C2C communication, personalized setting, safe driving assistance, traffic flow prediction and warning, prevention service through an On Board Diagnostics (OBD) and the like with vehicles into a mobile network terminal so as to meet the market development trend and customer requirements, further improve the high integration level of the domestic automobile electronics and master the more advanced automobile electronic technology as soon as possible.
Meanwhile, the rapid development of microelectronic technology and digital signal processing technology has comprehensively improved processing speed, operation precision, processor structure, instruction system, instruction flow and other aspects, and has rapidly obtained extremely wide application in a plurality of fields such as image processing, voice, radar, image processing, communication system, system control, fault detection and the like. The electronic integration of the whole vehicle is advanced, the requirements of drivers and passengers on intellectualization, safety and comfort of the whole vehicle are continuously improved, and the vehicle-mounted electronic is required to have the functions of fault real-time diagnosis information display and real-time uploading of related monitoring information to a cloud and driving assistance; and the space layout of the instrument desk of the whole vehicle, which is suitable for the observation and operation of drivers and passengers, is limited, and the electronic function of the whole vehicle is required to be highly integrated, the volume is miniaturized, and the screen display information is multifunctional.
Disclosure of Invention
The embodiment of the invention provides a vehicle-mounted intelligent information terminal, which is used for solving the problems of single function, complex assembly and debugging and electromagnetic compatibility interference of a finished vehicle terminal product in the prior art and saving the layout space of electronic components of a finished vehicle.
The embodiment of the invention provides a vehicle-mounted intelligent information terminal, which comprises a main control board and a display screen driving board;
the main control board comprises an MCU system unit and a CPU system unit; the MCU system unit comprises a microprocessor MCU, a peripheral reset circuit, a crystal oscillator circuit and a ferroelectric storage circuit which are connected with the microprocessor, and a 2-channel CAN communication processing circuit, a 4G communication control circuit, a positioning processing circuit, a 6-axis gyroscope processing circuit, a switching signal acquisition processing circuit, an ADC acquisition processing circuit, a radio drive circuit and a multi-stage power supply processing circuit which are connected with the microprocessor; the CPU system unit comprises a CPU, a peripheral reset circuit, a crystal oscillator circuit, an EMMC storage circuit, a DDR4 memory circuit, an audio processing circuit, a sound effect processing circuit, an audio driving control circuit, a voice noise reduction processing circuit, a video signal input processing circuit, a video display driving circuit, a high-definition video input circuit, a power supply processing circuit, a Bluetooth wifi processing circuit and a 4G communication processing circuit, wherein the peripheral reset circuit, the crystal oscillator circuit, the EMMC storage circuit and the DDR4 memory circuit are connected with the CPU;
the display screen driving board comprises a liquid crystal backlight driving circuit, a liquid crystal display signal control circuit, a liquid crystal display signal driving circuit, a double-microphone signal acquisition circuit, a key controller circuit and a system reset switch circuit.
Preferably, the system also comprises a USB interface, a TF card interface board, a liquid crystal display screen, an FPC (flexible printed circuit) cable, an antenna, a loudspeaker, a subwoofer, a CVBS (composite video broadcast signal) signal interface and an LVDS signal interface.
Preferably, the positioning processing circuit comprises a Beidou positioning information analysis data channel and a GPS positioning information analysis data channel; the Beidou positioning information analysis data channel and the GPS positioning information analysis data channel receive signals from an external antenna filter, the signals enter the adjusting and demodulating module through the signal amplifier and are respectively output to the two channels, coordinate position information is analyzed through multi-satellite signals in an operation period of the internal embedded DSP, and the coordinate position information is sent to the microprocessor through a serial port to provide dual-channel positioning information of the whole system; and meanwhile, a 4G communication control circuit and a 6-axis gyroscope processing circuit are introduced to supplement and perfect the information of the positioning information, and the 4G communication positioning information of the 4G communication control circuit and the gyroscope information of the 6-axis gyroscope processing circuit are adopted to provide position information under the condition of missing positioning signals.
Preferably, the 4G communication processing circuit is from an external antenna filter circuit to a signal amplification and detection processing circuit to a modem, and the data signal is analyzed by the built-in embedded processor through the baseband analyzing circuit, so as to provide the whole system with full-duplex voice call service and GPRS data stream service;
GPRS data are provided to the CPU and the wifi circuit through the USB data interface, GPRS data service based on the internet is completed, hot spot virtualization routing service is carried out through the wifi circuit, a local area network wifi communication channel is provided, and access of other data units of the vehicle is facilitated.
Preferably, the video signal input processing circuit is processed by the 3 paths of CVBS signal input sampling filter circuit, then provided to the CVBS signal processing unit, processed and then input to the CPU, and meanwhile, the 3 paths of CVBS signals are all provided with independent hardware signal detection circuits, and the validity of the input 3 paths of CVBS signals is detected in real time and sent to the microprocessor MCU.
Preferably, the multistage power supply processing circuit comprises a pre-stage filter circuit, a voltage stabilization protection circuit, a transient suppression circuit, a post-stage power supply processing circuit, a boosting circuit and a backlight constant current circuit; the post-stage power supply processing circuit is used for processing the DC24V input power supply and providing DC12V, DC5V, DC4.2V, DC3.3, DC1.8V, DC18V and a constant-current 180mA power supply for system application.
Preferably, the high-definition video input circuit comprises a power supply circuit with DC12V hard isolation belt short-circuit protection, an LVDS signal transmission anti-interference circuit, an LVDS signal serialization transmission decoding circuit and a data storage circuit; the DC12V supplies power to external high-definition equipment, the high-definition equipment provides a high-definition video signal coded by the LVDS serial number chip, the high-definition video signal is processed by the LVDS signal transmission anti-interference circuit, then the high-definition video signal is input to the LVDS signal serialization transmission decoding circuit to be decoded and then is provided to the CPU, and the CPU codes and decodes the high-definition video signal.
Preferably, the audio processing circuit is used for processing digital audio and video signals output by the TF card and the USB storage device, a prompt signal of navigation application, an internet audio and video signal of a mobile phone, a voice recognition signal, and a radio station audio signal processed by the digital radio circuit through a hardware decoder integrated inside the cpu; the analog signals input to the multi-channel audio decoding DSP circuit unit and modulated are output to the sound effect processing circuit.
Preferably, the CVBS video signal hardware monitoring circuit unit is used for isolating invalid signal frequency through a capacitor, amplifying the signal amplitude of the CVBS video signal through a triode amplifying circuit, inputting the amplified signal into a triode, a follow current capacitor and a voltage stabilizing diode after the amplified signal is isolated by the capacitor, and outputting a stable level signal under pull-up voltage reference so as to perform hardware detection on the CVBS valid signal and provide the switching effect of the auxiliary display screen of the CPU unit.
Preferably, the CPU is further configured to decode navigation TTS voice broadcast prompts, TF cards, and usb disk devices connected through the peripheral circuit unit and output the decoded navigation TTS voice broadcast prompts, TF cards, and usb disk devices to the audio DSP modulation circuit unit; meanwhile, the radio unit, the MIC unit, the Bluetooth audio unit and the 4G voice signal unit of the input source are output to the audio DSP modulation circuit unit through respective processing circuits; the audio DSP modulation circuit unit performs DSP rendering characteristic processing on an audio signal input by the audio DSP modulation circuit unit and outputs the audio signal to the sound effect processing circuit, the sound effect balance processing circuit performs sound effect mode and stereo sound effect balance processing and then drives the power amplifier unit to drive an external load loudspeaker; while a subwoofer drive signal is output.
According to the vehicle-mounted intelligent information terminal provided by the embodiment of the invention, signals of a vehicle power CAN and a vehicle body CAN bus are acquired through a CAN circuit, under the auxiliary cooperation of a Microprocessor (MCU) unit, a Central Processing Unit (CPU) processes power supply data, engine rotating speed data, instantaneous oil consumption data, gear data, vehicle speed data, 6-axis gyroscope data and brake data of a whole vehicle, and on the basis of the data, embedded data analysis is adopted, a driving chart is used for driving behavior analysis and a guidance instruction of recommended optimized driving behavior is provided; and simultaneously, the air conditioner, the light, the door switch and the glass lifting control of the whole vehicle are controlled by combining the CAN data of the whole vehicle with voice recognition. In addition, abnormal conditions occurring in the running process of the vehicle are recorded according to the CAN signal characteristics of the vehicle, on one hand, data are visually displayed and provided for a diagnostic instrument to carry out historical fault detection, on the other hand, the data are provided for a service information platform through a 4G network to carry out vehicle abnormal state monitoring, and spare part set is provided according to data analysis. In order to ensure the matching with the whole vehicle network, the CAN communication mode is provided with a BUS OFF function, so that the CAN BUS network blockage of the whole vehicle CAN not be influenced by the communication error of the CAN, the smooth communication of the system is ensured, and the universality and the reliability are improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic block diagram of a vehicle mounted intelligent information terminal assembly of an embodiment of the present invention;
FIG. 2 is a circuit diagram of the MCU control part of the embodiment of the present invention for detecting the power input;
FIG. 3 is a circuit diagram of a CPU data processing part input by a power supply according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a multi-channel power processing circuit according to an embodiment of the invention;
FIG. 5 is a schematic diagram illustrating the functional components of positioning, 4G communication, and wifi sharing data according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a video signal input processing circuit according to an embodiment of the present invention;
fig. 7 is a schematic diagram of an audio driving processing circuit according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. 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 invention.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
The rapid development of microelectronic technology and digital signal processing technology has improved processing speed, operation precision, processor structure, instruction system, instruction flow and other aspects, and has rapidly gained wide application in many fields such as image processing, voice, radar, image processing, communication system, system control, fault detection and the like. The electronic integration of the whole vehicle is advanced, the requirements of drivers and passengers on intellectualization, safety and comfort of the whole vehicle are continuously improved, and the vehicle-mounted electronic is required to have the functions of fault real-time diagnosis information display and real-time uploading of related monitoring information to a cloud and driving assistance; and the space layout of the instrument desk of the whole vehicle, which is suitable for the observation and operation of drivers and passengers, is limited, and the electronic function of the whole vehicle is required to be highly integrated, the volume is miniaturized, and the screen display information is multifunctional.
In view of the above, an embodiment of the present invention provides an integrated design scheme for a vehicle-mounted intelligent information terminal, which is used for performing integrated development on independent application functions distributed at multiple points in the past, and has functions of freight version navigation (offline and online modes), mobile phone interconnection (WIFI + BT, USB + BT), voice control (offline and online), digital radio, multimedia (music, Video, picture, e-book), bluetooth phone, high definition Video recording and display, CVBS (Composite Video Broadcast Signal) Signal display (back running, right view, BSD, 360-circle view, LDWS, etc.), and the like, and accesses to a vehicle CAN bus data to execute vehicle control, driving behavior analysis, and safe driving mode; the expansion supports 4G wireless internet access, and the local positioning function completes service data support; meanwhile, the product finally displays rich and diversified human-computer interaction interfaces, so that the overall attractiveness of the cab is improved, and the operation is convenient. The intelligent and comfortable level of the whole vehicle is improved, a plurality of auxiliary functions are added to assist driving operation, the running state of the vehicle can be diagnosed in time, the reliability and the safety performance in the running process of the whole vehicle are improved, and the intelligent and comfortable vehicle running system has a remarkable significance in promoting the digital, intelligent and comfortable process of the whole vehicle. The following description and description will proceed with reference being made to various embodiments.
The embodiment of the invention provides a vehicle-mounted intelligent information terminal, which comprises a main control board and a display screen driving board;
the main control board comprises an MCU system unit and a CPU system unit; the MCU system unit comprises a microprocessor MCU, a peripheral reset circuit, a crystal oscillator circuit and a ferroelectric storage circuit which are connected with the microprocessor, and a 2-channel CAN communication processing circuit, a 4G communication control circuit, a positioning processing circuit, a 6-axis gyroscope processing circuit, a switching signal acquisition processing circuit, an ADC acquisition processing circuit, a radio drive circuit and a multi-stage power supply processing circuit which are connected with the microprocessor; the CPU system unit comprises a CPU, a peripheral reset circuit, a crystal oscillator circuit, an EMMC storage circuit, a DDR4 memory circuit, an audio processing circuit, a sound effect processing circuit, an audio driving control circuit, a voice noise reduction processing circuit, a video signal input processing circuit, a video display driving circuit, a high-definition video input circuit, a power supply processing circuit, a Bluetooth wifi processing circuit and a 4G communication processing circuit, wherein the peripheral reset circuit, the crystal oscillator circuit, the EMMC storage circuit and the DDR4 memory circuit are connected with the CPU;
the display screen driving board comprises a liquid crystal backlight driving circuit, a liquid crystal display signal control circuit, a liquid crystal display signal driving circuit, a double-microphone signal acquisition circuit, a key controller circuit and a system reset switch circuit.
In this embodiment, the main control board comprises a Micro Controller Unit (MCU) and a Central Processing Unit (CPU), the micro controller unit comprises a peripheral reset circuit, a crystal oscillator circuit, a ferroelectric memory circuit, a 2-channel CAN communication processing circuit, a 4G communication control circuit, a beidou compatible positioning processing circuit, a 6-axis gyroscope processing circuit, a switch signal acquisition processing circuit, an ADC acquisition processing circuit, a radio driver circuit, a multi-stage power processing circuit, etc. connected to the Micro Controller Unit (MCU), the central processing unit comprises a peripheral reset circuit, a crystal oscillator circuit, a memory (EMMC) circuit, a memory (DDR4) circuit connected to the Central Processing Unit (CPU), an audio processing circuit, a sound effect processing circuit, an audio driver control circuit, a voice noise reduction processing circuit, etc. connected to the Central Processing Unit (CPU), The system comprises a video signal input processing circuit, a video display driving circuit, a high-definition video input circuit, a power supply processing circuit, a Bluetooth wifi processing circuit, a 4G communication processing circuit and the like; the display screen driving board comprises a liquid crystal backlight driving circuit, a liquid crystal display signal control circuit, a liquid crystal display signal driving circuit, a double-microphone signal acquisition circuit, a key controller circuit, a system reset switch circuit and the like. A vehicle-mounted intelligent information terminal controls Beidou compatible GPS positioning through MCU through the cooperation of circuit modules of a main control board, 4G wireless communication, signal processing, CAN bus signal monitoring, radio driving, gyroscope measurement and power-on time sequence control and manages audio and video decoding through CPU, video display output, analog camera signal analysis, cutting and merging of camera input image signals, high-definition video compression storage, navigation map driving, liquid crystal display driving, voice noise reduction recognition, Bluetooth and wifi signal receiving and processing, mobile phone mapping interconnection and communication between a USB interface and a FT interface, a liquid crystal screen driving board drives a liquid crystal screen to complete image display, and a capacitance touch signal is fed back to CPU to perform control operation. In this way, the intelligent network service, the audio-visual entertainment service and the auxiliary driving function are systematically integrated, and the intelligent network service, the audio-visual entertainment service and the auxiliary driving function are provided for a monitoring platform system and a finished vehicle fault diagnosis system. The system has the functions of integrating freight version navigation (offline and online modes), mobile phone interconnection (WIFI + BT, USB + BT), voice control (offline and online), digital radio, multimedia (music, video, pictures and electronic books), Bluetooth telephones, high-definition video recording and displaying, CVBS signal displaying (backing, right-view, BSD, 360-ring view, LDWS and the like), and accessing the CAN bus data of the whole vehicle to execute vehicle control, driving behavior analysis and safe driving modes; the system supports the 4G wireless internet access and positioning functions to complete the service function of the service data platform; the display of abundant and diversified human-computer interaction interfaces not only improves the overall attractiveness of the cab, but also is convenient to operate. Finally, each unit can be selectively started according to the functional requirements and the user application conditions, and the design idea of the current module is met; the intelligent and comfortable level of the whole vehicle is improved, a plurality of auxiliary functions are added to assist driving operation, the vehicle operation state can be diagnosed in time, the reliability and safety performance in the whole vehicle operation process are improved, and the digital, intelligent and comfortable process of the whole vehicle is promoted.
As shown in fig. 1, the circuit part of the vehicle-mounted intelligent information terminal is composed of a main control board, a display drive board, a USB interface, a TF interface board, a liquid crystal display, a touch unit, an FPC cable, a GPS and beidou positioning, a microphone, CVBS signals, LVDS signals, PWR keys, and the like. The main control board is completed by the cooperation of the MCU control part and the CPU data processing part, the voltage of the whole vehicle working power supply DC 16V-DC 36V is input, DC5V is output to the external sensor unit, and DC12V driving power is output to the CVBS and the LVDS camera unit; the USB interface is connected with an external USB universal device, reads file information such as audio files, video files, electronic books, PDF (Portable document Format) files, pictures and the like, and is analyzed and driven and displayed by a CPU (Central processing Unit) on the main control panel; the TF card interface is connected with external TF card equipment, on one hand, compression storage and history record playing of video image data of the CVBS and the LVDS are supported, and on the other hand, system operation logs are stored; the 4G provides network registration information, GPRS data communication, a short message receiving function and a telephone voice function are completed through a wireless communication circuit unit arranged in the system and a GPRS gain antenna connected externally, quick positioning data based on a 4G base station is provided, and wireless data service of the whole vehicle is provided for hot spots virtually through a wifi circuit; the radio antenna interface is connected to the radio processing circuit module, has a high-sensitivity parameter configuration function, automatically stores AM and FM radio station frequency signals recorded by frequency sweep, can execute a radio station preview function in a full frequency band range, records the radio station frequency characteristic and common radio stations used by a user, preferentially previews the previous radio station information after the radio is started, and subjectively improves the application experience of the user; the loudspeaker unit is processed by an internal control circuit driving circuit, outputs high-fidelity stereo, executes mixed sound output characteristics according to system sound source characteristics, realizes sound effect mode adjustment of 7 modes and stereo sound effect balance adjustment, records configuration parameter characteristics and carries out systematic configuration processing so as to adapt to individual performance requirements of different users; the touch control unit and the liquid crystal display screen unit are fully laminated, the display effect is improved by the antireflection film coating, the anti-radiation film coating, the anti-atomization film coating and the anti-explosion film coating, multi-point touch control operation is supported under the condition of real-time display, the application environment and the application habits of operators are fully considered, misoperation and illegal judgment abnormal operation are effectively reduced, and the use convenience is improved; the CVBS signal supports 3 paths of N-standard or P-standard camera signal input, one of the paths can be selected in real time according to the user requirement through the processing of an internal video processing circuit unit and the calibration of system configuration parameters to carry out large-picture display and the highest support is carried out to 720P video signal display through touch operation and system parameter setting, and meanwhile, the interface not only supports the camera but also supports the CVBS video signal input by an equipment unit; the key cooperation is matched with the touch unit, so that the accurate positioning operation can be conveniently realized, the device can adapt to users with different operation habits, and the key operation can be accurately adopted to execute the operation of one-key positioning user function under the condition of shaking in the running process of the vehicle; acquiring a finished automobile signal through a CAN bus to complete driving behavior analysis, vehicle control and a safe driving mode; the microphone is connected to the hardware noise reduction circuit to filter interference noise of the whole vehicle of the input signal, and the voice recognition rate and the Bluetooth telephone conversation quality are improved. A vehicle-mounted intelligent information terminal only integrates the above unit modules, and realizes a wireless communication function, a Beidou compatible GPS positioning function, a radio function, an audio and video playing function, a CVBS image processing function, an LVDS high-definition video processing function, a mobile phone interconnection function, a voice recognition function, a Bluetooth electric arc function, an HMI human-machine interface display function, a high-fidelity sound output driving function, a multi-point touch control function and the like for the first time in the field of vehicle-mounted electronics; each functional unit is efficiently completed under the coordination control of the core CUP and the master control MCU, so that the layout space of electronic components of the whole vehicle is saved, and the connection wiring harness and the electromagnetic compatibility interference integrated by a plurality of single-function products in the prior art are reduced; in addition, the product is highly integrated, and the compatibility of each function of the product is effectively solved through the unified debugging and installation of the product functions in the development stage. The development of the product not only improves the entertainment application function and the driving comfort of a user, accords with the current trend of vehicle-mounted electronic development, but also integrates the vehicle driving behavior analysis, the vehicle control, the safe driving mode and the vehicle wireless signal resource sharing service to provide intelligent application; meanwhile, due to the fact that LVDS high-definition video and CVBS camera display functions are configured on hardware of the system, the running state and running safety of the vehicle can be monitored in real time, and running safety of the whole vehicle is improved.
Fig. 2 shows a preferred embodiment of the above embodiments. A main control board-MCU control part of a vehicle-mounted intelligent information terminal comprises a power input detection circuit unit, a multi-stage power processing circuit unit, a power output circuit unit, a CAN communication circuit unit, an IIC communication circuit unit, an IIS communication circuit unit, a 6-axis gyroscope circuit unit, an ACC acquisition circuit unit, a small lamp signal driving circuit, a PWR key acquisition circuit, a CVBS signal detection circuit, a radio driving circuit unit, a signal acquisition processing circuit unit, a BD compatible GPS positioning circuit unit, a 4G communication processing circuit unit, a reset circuit connected with an MCU, a crystal oscillator circuit unit, a ferroelectric storage circuit unit and the like. The power input detection circuit detects and identifies the self characteristics of the input power voltage after transient suppression processing, reverse connection prevention processing and filtering processing are carried out on the input voltage to prevent abnormal interference from entering, when the detected power voltage value is between DC16V and DC36V specified by a system, the detected power voltage is input to the multi-stage power processing circuit unit for processing, then the detected power voltage is output to the system through DC12V, DC5V, DC3.6V, DC3.3V and DC3.3V voltages, and meanwhile, the detected power voltage is supplied to the outside to output DC12V and DC5V for the use of a vehicle speed sensor and an external camera unit; when the voltage value threshold is lower than DC16V, in order to prevent the service life of the battery of the whole vehicle from being directly influenced by extreme feeding, the system stops power consumption and enters a deep sleep state, so that the power consumption of the whole vehicle is reduced, and the irreparable fault of the battery is avoided; when the battery voltage is higher than DC36V, the system stops using the abnormal high-voltage power supply and enters a deep sleep state, so that the abnormal high-voltage power supply is prevented from causing irreparable damage to the system, and when the abnormal power supply is recovered to be between the normal voltage DC 16V-DC 36V, the system can automatically detect and recover to a normal working state. The CAN communication circuit is connected with a CAN communication bus of the whole vehicle to the MCU main control unit, and is responsible for information interaction between the system and the whole vehicle, real-time monitoring and diagnosis of the power state and the vehicle body state of the whole vehicle are completed, historical fault data are recorded for display and prompt, related state quantity and position information are sent to a remote cloud platform through a 4G wireless communication circuit in time according to an embedded program control strategy to perform identification and control of a big data form, illegal driving operation and running operation are recorded on a case, driving behavior analysis and safe driving mode analysis basis in careers are performed, and driving morality is standardized in principle to improve vehicle running safety; meanwhile, vehicle fault information and abnormal data are analyzed in advance, vehicle problems are solved in real time in a remote diagnosis mode or rescue measures of vehicle road operation faults are made in advance, and losses are greatly reduced. The internal communication circuit is connected with the MCU unit and the CUP of the display screen driving board, and the data interaction communication rate and the system hardware port resources are carried out in IIS, IIC and IPS modes, so that the real-time performance and the accuracy of signal transmission are ensured. The 6-axis gyroscope circuit unit is responsible for carrying out vehicle inertial navigation in positioning and 4G positioning blind areas so as to improve accurate positioning information. The radio driving circuit unit provides FM and AM frequency bands for the system, has high sensitivity, supports small-scale stepping operation through MCU parameter configuration, and improves the channel searching performance and the radio station preview function of the system. The signal acquisition circuit unit supports multi-channel IO identification, supports configuration in a high-level and low-level multiplexing mode, and facilitates system matching application. The Beidou positioning circuit unit supports a Beidou positioning and GPS positioning mixed mode, the mixed positioning mode is selected according to a positioning signal state system to enhance the positioning accuracy, and the GPS and the Beidou independent positioning signals can also be independently used to provide position information for a navigation map and a running data record. The 4G communication processing circuit provides networking wireless data service for the system and supports data uploading and platform calibration data. The ACC signal identification circuit, the small lamp driving circuit and the PWR key acquisition circuit adopt filtering and decoupling processing to eliminate peak and abnormal interference signals, ensure that the system can identify accurate state information when the key is operated, and cooperate to complete the functions of starting, key operation indication and backlight automatic adjustment in the whole vehicle power supply range. Through the reasonable combination of the upper circuits, the main control board completes various works under the assistance of the MCU.
The 4G communication processing circuit receives and sends GPRS data stream information, 4G positioning information and voice call information through an antenna; the GPRS data flow information is provided to a CPU system data processing unit, on one hand, the GPRS data flow information is transmitted to a wifi circuit unit, shared information service and platform interaction data service are provided for hot spot signals virtually, on the other hand, vehicle operation parameters, driving behavior analysis and safe driving states are uploaded to a platform in real time, and meanwhile remote vehicle control is conducted.
In addition to the above embodiments, as another preferred implementation, as shown in fig. 3, the vehicle-mounted intelligent information terminal main control board-CPU data processing portion is composed of a power input circuit unit, a real-time clock circuit unit, a multi-stage power processing circuit unit, an IIC communication circuit unit, an IIS communication circuit unit, a voice noise reduction circuit unit, an audio driving controller circuit, a USB charging circuit, a USB, TF communication circuit, an LVDS high-definition video processing circuit, a 3-way CVBS video processing circuit, a touch control circuit unit, a liquid crystal display driving circuit, a liquid crystal display screen, a reset circuit unit connected to the CPU, a crystal oscillator circuit unit, an EMMC storage circuit unit, a DDRD circuit unit, and the like. The power input circuit receives a DC5V power supply processed by the main control board, and the power supply is processed into DC3.3V, DC1.8V and DC1.2V flashes through filtering and decoupling processing to supply power to the EMMC storage circuit, the DDR4 circuit and the CPU, so that the power supply requirement of the system is met. The system clock can be corrected through the time signal analyzed by the positioning signal and the GPRS network signal, and the system clock is ensured to run accurately. The reset circuit unit, the crystal oscillator circuit unit, the EMMC storage circuit unit and the DDRD circuit unit are common circuit units and provide necessary support for system operation. And the internal communication circuit unit receives IIS, IIC and IPS of the MCU unit part of the main control board to complete the interaction of information in the system. The voice noise reduction circuit filters interference, performs echo noise reduction processing and outputs standard collected audio signals to a CPU unit for voice recognition after DSP operation on a double-microphone input signal and a system feedback audio signal. The audio driving control circuit selects the audio source from radio, Bluetooth telephone, Bluetooth music or audio played in the system, map navigation voice, voice recognition control prompt tone or system forecast audio according to the user operation, switches seamlessly in real time through the circuit, and has the advantages of echo, noise reduction, vehicle noise and environmental noise processing, and the comfort of the user is ensured. And the USB charging circuit is connected to the CPU for judging the communication protocol, judges the external equipment, outputs the highest 2.1A charging current according with the protocol judgment rule and executes a quick charging task. The UDB and TF communication circuit is connected to the CPU and the external interface, reads input data of the external device, and stores local compressed archived data. The CVBS processing circuit is used for driving an external 3-channel N, P analog camera or CVBS image information output by other equipment ends, the LVDS processing circuit is used for processing 1080P video data input by a high-definition camera or high-definition video data input by other image equipment ends, and performing real-time display on the video data according to a preset logic strategy and performing H.264 coding compression on the video data to perform data storage and file tasks. The touch control circuit unit only supports multi-point touch control operation on touch control signal processing, and provides a signal source of user operation for the system. The display driving circuit of the liquid crystal screen is matched with the liquid crystal screen, and the image information output by the CUP is transmitted to the image analysis circuit through the transmission driving circuit and the impedance matching circuit, and the information is displayed on the liquid crystal screen after analysis. Through the reasonable combination of the upper circuit, the display screen driving board completes various operations under the assistance of the CUP.
On the basis of the above embodiment, the system further comprises a USB interface, a TF card interface board, a liquid crystal display screen, an FPC (flexible printed circuit) cable, an antenna, a loudspeaker, a subwoofer, a CVBS (composite video broadcast signal) signal interface and an LVDS signal interface.
The navigation TTS voice broadcast prompt, the TF card and the USB flash disk device are connected to the CUP unit through respective peripheral circuit units, and are output to the audio DSP modulation circuit unit after being decoded; meanwhile, the radio unit, the MIC unit, the Bluetooth audio unit and the 4G voice signal unit of the input source are output to the audio DSP modulation circuit unit through respective processing circuits; the audio DSP modulation circuit unit performs DSP rendering characteristic processing on an audio signal input by the audio DSP modulation circuit unit and outputs the audio signal to the sound effect processing circuit, the sound effect balance processing circuit performs sound effect mode and stereo sound effect balance processing and then drives the power amplifier unit to drive an external load loudspeaker; while a subwoofer drive signal is output.
On the basis of the above embodiments, the multi-stage power supply processing circuit includes a pre-stage filter circuit, a voltage stabilization protection circuit, a transient suppression circuit, a post-stage power supply processing circuit, a voltage boost circuit, and a backlight constant current circuit; the post-stage power supply processing circuit is used for processing the DC24V input power supply and providing DC12V, DC5V, DC4.2V, DC3.3, DC1.8V, DC18V and a constant-current 180mA power supply for system application.
In this embodiment, as a preferred implementation, the multi-stage power supply processing circuit is composed of a pre-stage filter circuit, a voltage stabilization protection circuit, a transient suppression circuit, a post-stage power supply processing circuit, a voltage boost circuit, and a backlight constant current circuit; the post-stage power supply processing circuit is used for processing the input power supply of the DC24V and providing a DC12V, DC5V, DC4.2V, DC3.3, DC1.8V, DC18V and a constant-current 180mA power supply for system application; on one hand, power drive is provided for an external port, and meanwhile, an operation power supply is provided for each functional unit of the main power board, and in addition, an operation boosting power supply is provided for the display drive board; the whole system adopts low-voltage-difference hard isolation voltage conversion, so that fluctuation impact caused by sudden voltage change of the whole vehicle complex power supply system can be effectively prevented, and the high-efficiency and reliable work of the whole system is ensured.
In addition to the above embodiments, as a preferred embodiment, as shown in fig. 4, the multi-channel power supply processing circuit unit includes a DC24V processing circuit, a protection circuit, a voltage detection circuit, a voltage self-test circuit, a 12V processing circuit, a 5V processing circuit, a 3.6V processing circuit, a battery unit, a 3.3V processing circuit, a 1.8V processing circuit, and a panel driving board power supply system 18V, 11.5V, 4.5V, or-7.5V. The specific implementation mode is as follows: the DC24V processing circuit and the protection circuit unit filter incoming lines of the input power supply, prevent reverse connection protection and stabilize voltage to ensure that the reference power supply of the input system is reliable and output to the voltage detection voltage circuit unit, and the overvoltage self-test circuit unit outputs to the 5V power supply processing circuit unit and the screen drive board power supply system circuit unit from the 12V power supply processing circuit branch 2 paths; the 5V power supply processing circuit unit respectively outputs a plurality of paths of power supplies to the 3.6V power supply processing circuit unit and the 3.3V power supply processing circuit unit, and simultaneously the 5V power supply is input to the screen driving power supply system, the CAN circuit unit, the BD/GSP circuit unit, the URAT circuit unit, the 4G circuit unit, the gyroscope circuit unit and the external output circuit unit. The 12V and 5V adopt a multi-path output type power supply processing circuit, and the current output capability is controlled according to the system working condition, so that not only can the system power consumption be reasonably optimized, but also the heat dissipation loss of a controller system can be controlled; the voltage detection circuit unit monitors an input voltage signal in real time, inputs the input voltage signal to the MCU unit to calculate a voltage value, and feeds the voltage value back to the platform in a remote communication mode; the voltage self-test circuit unit supplies power through the control system, when the voltage of the vehicle is in a normal range of DC 16V-DC 36V, the system can be normally powered on to work, and the other systems under abnormal conditions do not supply power to work. The screen driving power supply system boosts the voltage to 18V according to 12V input to provide a backlight source, regulates the voltage to-7.5V after the voltage is reduced to 11.5V and provides a reference power supply, and the 5V power supply provides a driving power supply and a running reference power supply after the voltage is regulated to 4.5V; meanwhile, the 24V power supply excess current circuit is supplied with power to the power amplifier circuit after being transmitted to the filtering energy storage circuit and then transmitted to the power supply modulation energy storage smoothing processing circuit, so that the power driving power supply is ensured to operate stably, and the influence on user experience caused by sound breaking, sound breaking and sound distortion is prevented. The circuit completes power supply monitoring and system power supply management and control of the system under the condition of a set control logic, and ensures that the system is safe in power supply and is in a real-time monitoring state.
On the basis of the above embodiments, the positioning processing circuit includes a Beidou positioning information analysis data channel and a GPS positioning information analysis data channel; the Beidou positioning information analysis data channel and the GPS positioning information analysis data channel receive signals from an external antenna filter, the signals enter the adjusting and demodulating module through the signal amplifier and are respectively output to the two channels, coordinate position information is analyzed through multi-satellite signals in an operation period of the internal embedded DSP, and the coordinate position information is sent to the microprocessor through a serial port to provide dual-channel positioning information of the whole system; and meanwhile, a 4G communication control circuit and a 6-axis gyroscope processing circuit are introduced to supplement and perfect the information of the positioning information, and the 4G communication positioning information of the 4G communication control circuit and the gyroscope information of the 6-axis gyroscope processing circuit are adopted to provide position information under the condition of missing positioning signals.
In this embodiment, as a preferred implementation manner, the positioning processing circuit includes one Beidou positioning information analysis data channel and another GPS positioning information analysis data channel; the two paths of analysis channels receive signals from the external antenna filter, enter the adjusting and demodulating module after passing through the signal amplifier and are respectively output to the two paths of channels, coordinate position information is analyzed by multi-satellite signals in an operation period of the internal embedded DSP, the coordinate position information is sent to a Microprocessor (MCU) unit on a main board power panel through a serial port, and double-channel positioning information of the whole system is provided; meanwhile, a 4G communication positioning technology and a 6-axis gyroscope circuit unit are introduced to complement and perfect positioning information, and the 4G communication positioning and gyroscope information are adopted to provide position information under the condition of missing positioning signals. The positioning processing circuit has the functions of dual-signal positioning and multipoint positioning measurement and calculation, not only improves the credible positioning precision of the system, but also provides accurate positioning support in a complex application environment, eliminates the blind area effect in a single mode, and provides the reliability and the safety of the whole system based on positioning service; but also actively promote the industrialized and marketized development of Beidou positioning in China.
As shown in fig. 5, the positioning, 4G communication and wifi sharing data functions are composed of a big dipper compatible GPS dual-mode positioning circuit unit, a 4G communication circuit and a wifi sharing data circuit. The Beidou compatible GPS dual-mode positioning circuit unit comprises a dual-mode signal receiving antenna, a signal amplifier, a demodulator, a baseband, a DSP operation unit, an MCU and the like. The specific implementation mode is as follows: the dual-mode signal receiving antenna receives signals, the signals are processed into digital signals through the demodulator and the baseband of the Beidou and the GPS respectively after passing through the amplifier, the digital signals are transmitted to the digital signal arithmetic unit, and the data are analyzed into data content applied by the system after being analyzed by the digital signal arithmetic unit and are called by the MCU. The specific analysis content comprises: UTC, date, ground altitude, heading, number of satellites, TDOP, PDOP, HDOP, VDOP signal strength, location mode, location state, satellite elevation, azimuth, signal-to-noise ratio, and the like. And the MCU repackages the signals and transmits the repackaged signals to the CPU unit for function whole system calling, and assists in finishing functions of real-time, map navigation and the like. The 4G communication processing circuit comprises a main control MCU unit, a CPU data processing unit, a transmitting and receiving antenna, a duplexer, a power amplifier, an RF transceiver, an anti-aliasing filter circuit, a smoothing filter circuit, an analog baseband processing circuit, a digital baseband processing circuit, an MIC, a voice processing circuit, a voice driving circuit, a loudspeaker and the like. The specific implementation mode is as follows: the receiving channel is connected with a duplexer to an RF transceiver by a transmitting-receiving antenna, then is connected to an analog baseband processor circuit by an anti-aliasing filter circuit, is processed by an ADC/DAC processing circuit, a control GPIO circuit unit and a sound GPIO circuit unit in the analog baseband processor circuit under the control condition of an MCU and then is transmitted to a digital baseband and processing circuit, and is used for completing digital signal analysis by a DSP operation unit, a logic circuit processing unit and a memory unit in the digital baseband and processing circuit under the control condition of the MCU; meanwhile, the sending channel is connected with the smoothing filter circuit through the analog baseband processing circuit unit to the RF transceiver overpower amplifying circuit and then to the receiving and sending antenna through the duplexer; after an external voice signal is input through an MIC, the external voice signal is connected to a voice processing circuit and then is transmitted to an analog baseband processing circuit; the voice signal is output by the voice driving circuit and then is connected to the loudspeaker. The wifi shared data circuit is composed of a CPU data processing unit, a wifi circuit unit and a built-in antenna circuit unit. The specific implementation mode carries out virtual hot spot processing on data provided by the 4G communication circuit to the CPU data processing unit through the wifi circuit unit, and network sharing and bidirectional data interaction of the whole vehicle are provided. Meanwhile, the positioning data is integrated into Beidou compatible GPS positioning data, 4G network positioning and 6-axis gyroscopes to execute inertial navigation, so that defects and quick response among positioning units are completed on the basis of embedded logic judgment, and high-precision positioning information is provided for the whole vehicle to provide various positioning-based functional services. The circuit completes 4G data flow, a bidirectional voice function, wifi hot spots and high-precision positioning under the condition of established control logic.
On the basis of the above embodiments, the 4G communication processing circuit is from the external antenna filter circuit to the signal amplification and detection processing circuit to the modem, and the data signal is analyzed by the built-in embedded processor through the baseband analyzing circuit, so as to provide the whole system for full duplex voice call service and GPRS data stream service;
GPRS data are provided to the CPU and the wifi circuit through the USB data interface, GPRS data service based on the internet is completed, hot spot virtualization routing service is carried out through the wifi circuit, a local area network wifi communication channel is provided, and access of other data units of the vehicle is facilitated.
In this embodiment, as a preferred implementation, the 4G communication processing circuit includes an external antenna filter circuit, a signal amplification and detection processing circuit, and a modem, and analyzes data signals through a baseband analysis circuit and an embedded processor, so as to provide the whole system with full-duplex voice call service and GPRS data stream service;
GPRS data are provided to a Central Processing Unit (CPU) and a wifi circuit through a USB data interface, GPRS data service based on the internet is completed, hot spot virtualization routing service is carried out through the wifi circuit, a local area network wifi communication channel is provided, and access of other data units of a vehicle is facilitated. The system adopting the scheme has the functions of voice call and GPRS-based data sharing service. Meanwhile, the multi-port registration function can be edited by adopting data marking operation, the network registration address and the port information can be modified through a platform data protocol, the network registration address and the port information can also be modified according to a set protocol format by adopting a mobile phone short message scheme, the system platform registration process is optimized, and convenience is brought to engineering personnel and operators.
On the basis of the above embodiments, the video signal input processing circuit is processed by the 3-channel CVBS signal input sampling filter circuit, then provided to the CVBS signal processing unit, processed, and then input to the CPU, and meanwhile, the 3-channel CVBS signal has an independent hardware signal detection circuit, detects validity of the input 3-channel CVBS signal in real time, and sends the validity to the microprocessor MCU.
In this embodiment, as a preferred implementation, the video signal input processing circuit is processed by the 3 paths of CVBS signal input sampling filter circuits and then provided to the CVBS signal processing unit, and then input to the Central Processing Unit (CPU), and meanwhile, the 3 paths of CVBS signals all have independent hardware signal detection circuits, and detect validity of the input 3 paths of CVBS signals in real time, and send the validity to the Microprocessor (MCU). By adopting the design scheme, each path of camera signal can be independently processed, the real-time state of each path of signal is detected through hardware, the effectiveness of each channel signal can be judged, fault monitoring and diagnosis are carried out under the condition that the load of a CPU is not increased, and meanwhile, invalid information such as a black screen, a flashing screen and the like is prevented when 360-circle images, BSD and LDWS images are selectively displayed in a video mode according to embedded logic judgment and state monitoring, so that the convenience and driving safety of a user are provided.
As shown in fig. 6, the video signal is input to the processing circuit, which mainly processes the CVBS signal and the LVDS signal. The CVBS signal processing circuit consists of an input channel impedance and inductive reactance matching circuit unit, an anti-aliasing filter circuit and a CVBS video analyzing circuit; the specific implementation mode is as follows: analog signals (N system and P system) input by 3 channels of a camera CH or CVBS video signals input by other equipment are collected, the signals are processed by an anti-aliasing filter circuit and then sent to a video analysis processing circuit unit for digital processing, and the processed digital signals are subjected to sharpening rendering, white balance, color rendering and focused data processing and then sent to a CPU processing circuit unit. The LVDS signal processing circuit comprises an input channel impedance and inductive reactance matching circuit unit, an anti-aliasing filter circuit, an LVDS high-definition video processing circuit and the like; the specific implementation mode is as follows: LVDS high definition video signals input by the LVDS high definition camera or other LVDS high definition equipment are processed by the anti-aliasing filter circuit and then sent to the LVDS high definition video processing circuit unit, the LVDS signals are analyzed into 8-bit parallel port signals, state system type synchronous models and clock signals, and the signals are sent to the CPU processing circuit unit. The CPU processing circuit unit performs liquid crystal display screen display on the final image interface according to the embedded processing logic on the input CVBS signal and LVDS analysis signal by the circuit under the condition of the established control logic, so that a user can conveniently observe the final image interface, performs H.246 compression on data on the other hand, encapsulates the data into MP4 format, stores the data in the TF card for data storage, and supports data calling and playing.
On the basis of the above embodiments, the high-definition video input circuit includes a DC12V hard isolation power supply circuit with short-circuit protection, an LVDS signal transmission anti-interference circuit, an LVDS signal serialization transmission decoding circuit, and a data storage circuit; the DC12V supplies power to external high-definition equipment, the high-definition equipment provides a high-definition video signal coded by the LVDS serial number chip, the high-definition video signal is processed by the LVDS signal transmission anti-interference circuit, then the high-definition video signal is input to the LVDS signal serialization transmission decoding circuit to be decoded and then is provided to the CPU, and the CPU codes and decodes the high-definition video signal.
In this embodiment, as a preferred implementation, the high-definition video input circuit is composed of a DC12V hard isolation power supply circuit with short-circuit protection, an LVDS signal transmission anti-interference circuit, an LVDS signal serialization transmission decoding circuit, a data storage circuit, and the like; DC12V supplies power to external high-definition equipment, and high-definition equipment provides a high-definition video signal coded by an LVDS serial number chip, the high-definition video signal is input to an LVDS signal serialization transmission decoding circuit after being processed by an LVDS signal transmission anti-interference circuit, the high-definition video signal is decoded and then provided to a Central Processing Unit (CPU), the central processing unit finishes the work of coding and decoding the high-definition video signal, on one hand, the real color is displayed and restored by screen projection, on the other hand, the data is packed into an MP4 packaging format after being compressed by H.264, and is stored to form data record.
On the basis of the above embodiments, the audio processing circuit is configured to process, by a hardware decoder integrated inside the cpu, digital audio and video signals output by the TF card and the USB storage device, a prompt signal for navigation application, an internet audio and video signal of a mobile phone, a voice recognition signal, and a radio station audio signal detected and processed by a digital radio circuit; the analog signals input to the multi-channel audio decoding DSP circuit unit and modulated are output to the sound effect processing circuit.
In this embodiment, as a preferred implementation manner, the audio processing circuit processes, by a hardware decoder integrated inside the cpu, digital audio and video signals output by the TF card and the USB storage device, a prompt signal for navigation application, an internet audio and video signal of a mobile phone, a voice recognition signal, and a radio station audio signal detected and processed by a digital radio circuit; the input is given sound effect processing drive circuit to multichannel audio decoding DSP circuit unit analog signal output through the modulation, provides 7 kinds of sound effect regulation, sound effect balanced set, audio mixing effect processing, heavy bass signal output drive on the one hand after handling, and on the other hand provides output 4 way drive signal to audio drive processing circuit signal end, and external loudspeaker of final drive provides whole car high-fidelity audio output.
As shown in fig. 7, the audio driving processing circuit unit is composed of an audio signal input source, a CPU processing circuit unit, an audio DSP modulation circuit unit, an audio processing circuit, an audio balance processing circuit, a subwoofer driving circuit unit, a 4-way driving power amplifier unit, a speaker, and the like; the audio signal input source comprises a navigation TTS voice broadcast prompt, audio files stored by a TF card and a USB flash disk device, a radio unit, a Bluetooth telephone, music, a double MIC and hardware noise reduction processing unit and a 4G voice signal unit. The specific implementation mode is as follows: navigation TTS voice broadcast prompts, TF cards and USB flash disk equipment which are included by the audio signal input source are connected to the CUP unit through respective peripheral circuit units, and are output to the audio DSP modulation circuit unit after decoding processing; meanwhile, a radio unit, an MIC unit, a Bluetooth audio unit and a 4G voice signal unit which are included in an audio signal input source are output to an audio DSP modulation circuit unit through respective processing circuits; the audio DSP modulation circuit unit performs DSP rendering characteristic processing on an audio signal input by the audio DSP modulation circuit unit and outputs the audio signal to the sound effect processing circuit, the sound effect balance processing circuit performs sound effect mode and stereo sound effect balance processing and then drives the power amplifier unit to drive an external load loudspeaker; while a subwoofer drive signal is output. The circuit processes the signal provided by the system audio input source into specific sound under the condition of established control logic and outputs the sound in a stereo mode, and simultaneously has a mixing special effect processing mode to distinguish primary and secondary sound characteristic output in different application modes, and can set 7 sound effect modes and 4 paths of loudspeaker sound effect balance processing to adapt to different application main bodies.
On the basis of the above embodiments, the CVBS video signal hardware monitoring circuit unit is further included, and is configured to perform invalid signal frequency isolation through a capacitor, amplify a signal amplitude of the invalid signal through a triode amplification circuit, enter a triode, a freewheeling capacitor and a zener diode after the signal amplitude is isolated by the capacitor, and output a stable level signal under pull-up voltage reference, so as to perform hardware detection on the CVBS valid signal and provide an auxiliary display screen switching effect for the CPU unit.
In this embodiment, as a preferred implementation manner, the audio driving processing circuit is composed of a power amplifier output driving circuit unit and a power supply unit; the power supply unit circuit consists of a preceding stage input filtering and energy storage circuit, a power switch modulation circuit, a subsequent stage power supply energy storage smoothing processing circuit and a voltage limiting circuit which are formed by separating elements, so that the processing of the whole complex power supply system is met, the power amplifier output unit is not influenced by the change of an external power supply, and the optimal power supply state driven by audio frequency is always provided. The audio output is not only free from distortion noise interference caused by power supply mutation, improves the comfort of the use process, but also improves the working power supply range of the system, and the built-in self-built switch voltage-stabilizing processing circuit reduces power consumption and heat dissipation, increases the stability of the power supply, and provides basic conditions for long-time stable application of the system.
On the basis of the above embodiments, the CPU is further configured to decode navigation TTS voice broadcast prompts, TF cards, and usb disk devices connected through the peripheral circuit unit and output the decoded navigation TTS voice broadcast prompts, TF cards, and usb disk devices to the audio DSP modulation circuit unit; meanwhile, the radio unit, the MIC unit, the Bluetooth audio unit and the 4G voice signal unit of the input source are output to the audio DSP modulation circuit unit through respective processing circuits; the audio DSP modulation circuit unit performs DSP rendering characteristic processing on an audio signal input by the audio DSP modulation circuit unit and outputs the audio signal to the sound effect processing circuit, the sound effect balance processing circuit performs sound effect mode and stereo sound effect balance processing and then drives the power amplifier unit to drive an external load loudspeaker; while a subwoofer drive signal is output.
In summary, according to the vehicle-mounted intelligent information terminal provided by the embodiment of the invention, signals of a vehicle power CAN and a vehicle body CAN bus are acquired through a CAN circuit, under the auxiliary cooperation of a Microprocessor (MCU) unit, a Central Processing Unit (CPU) processes vehicle power data, engine rotating speed data, instantaneous oil consumption data, gear data, vehicle speed data, 6-axis gyroscope data and brake data, and on the data, embedded data analysis is adopted, a driving chart is used for driving behavior analysis and providing guidance instructions for advising optimization driving behavior; and simultaneously, the air conditioner, the light, the door switch and the glass lifting control of the whole vehicle are controlled by combining the CAN data of the whole vehicle with voice recognition. In addition, abnormal conditions occurring in the running process of the vehicle are recorded according to the CAN signal characteristics of the vehicle, on one hand, data are visually displayed and provided for a diagnostic instrument to carry out historical fault detection, on the other hand, the data are provided for a service information platform through a 4G network to carry out vehicle abnormal state monitoring, and spare part set is provided according to data analysis. In order to ensure the matching with the whole vehicle network, the CAN communication mode is provided with a BUS OFF function, so that the CAN BUS network blockage of the whole vehicle CAN not be influenced by the communication error of the CAN, the smooth communication of the system is ensured, and the universality and the reliability are improved.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A vehicle-mounted intelligent information terminal is characterized by comprising a main control board and a display screen driving board;
the main control board comprises an MCU system unit and a CPU system unit; the MCU system unit comprises a microprocessor MCU, a peripheral reset circuit, a crystal oscillator circuit and a ferroelectric storage circuit which are connected with the microprocessor, and a 2-channel CAN communication processing circuit, a 4G communication control circuit, a positioning processing circuit, a 6-axis gyroscope processing circuit, a switching signal acquisition processing circuit, an ADC acquisition processing circuit, a radio drive circuit and a multi-stage power supply processing circuit which are connected with the microprocessor; the CPU system unit comprises a CPU, a peripheral reset circuit, a crystal oscillator circuit, an EMMC storage circuit, a DDR4 memory circuit, an audio processing circuit, a sound effect processing circuit, an audio driving control circuit, a voice noise reduction processing circuit, a video signal input processing circuit, a video display driving circuit, a high-definition video input circuit, a power supply processing circuit, a Bluetooth wifi processing circuit and a 4G communication processing circuit, wherein the peripheral reset circuit, the crystal oscillator circuit, the EMMC storage circuit and the DDR4 memory circuit are connected with the CPU;
the display screen driving board comprises a liquid crystal backlight driving circuit, a liquid crystal display signal control circuit, a liquid crystal display signal driving circuit, a double-microphone signal acquisition circuit, a key controller circuit and a system reset switch circuit.
2. The vehicle-mounted intelligent information terminal according to claim 1, further comprising a USB interface and TF card interface board, a liquid crystal display, an FPC (flexible printed circuit) cable, an antenna, a speaker, a subwoofer, a CVBS (composite video broadcast signal) interface and an LVDS (low voltage differential signaling) interface.
3. The vehicle-mounted intelligent information terminal according to claim 1, wherein the positioning processing circuit comprises a Beidou positioning information analysis data channel and a GPS positioning information analysis data channel; the Beidou positioning information analysis data channel and the GPS positioning information analysis data channel receive signals from an external antenna filter, the signals enter the adjusting and demodulating module through the signal amplifier and are respectively output to the two channels, coordinate position information is analyzed through multi-satellite signals in an operation period of the internal embedded DSP, and the coordinate position information is sent to the microprocessor through a serial port to provide dual-channel positioning information of the whole system; and meanwhile, a 4G communication control circuit and a 6-axis gyroscope processing circuit are introduced to supplement and perfect the information of the positioning information, and the 4G communication positioning information of the 4G communication control circuit and the gyroscope information of the 6-axis gyroscope processing circuit are adopted to provide position information under the condition of missing positioning signals.
4. The vehicle-mounted intelligent information terminal according to claim 1, wherein the 4G communication processing circuit is from an external antenna filter circuit to a signal amplification and detection processing circuit to a modem, and the data signal is analyzed by the built-in embedded processor through the baseband analysis circuit so as to provide the whole system with full-duplex voice call service and GPRS data stream service;
GPRS data are provided to the CPU and the wifi circuit through the USB data interface, GPRS data service based on the internet is completed, hot spot virtualization routing service is carried out through the wifi circuit, a local area network wifi communication channel is provided, and access of other data units of the vehicle is facilitated.
5. The vehicle-mounted intelligent information terminal according to claim 1, wherein the video signal input processing circuit is processed by the 3-channel CVBS signal input sampling filter circuit, then provided to the CVBS signal processing unit, processed, and then input to the CPU, and meanwhile, the 3-channel CVBS signal processing unit is provided with an independent hardware signal detection circuit, and the validity of the input 3-channel CVBS signal is detected in real time and sent to the microprocessor MCU.
6. The vehicle-mounted intelligent information terminal according to claim 1, wherein the multi-stage power supply processing circuit comprises a pre-stage filter circuit, a voltage stabilization protection circuit, a transient suppression circuit, a post-stage power supply processing circuit, a boosting circuit and a backlight constant current circuit; the post-stage power supply processing circuit is used for processing the DC24V input power supply and providing DC12V, DC5V, DC4.2V, DC3.3, DC1.8V, DC18V and a constant-current 180mA power supply for system application.
7. The vehicle-mounted intelligent information terminal according to claim 1, wherein the high-definition video input circuit comprises a DC12V power supply circuit with short-circuit protection in hard isolation, an LVDS signal transmission anti-interference circuit, an LVDS signal serialization transmission decoding circuit and a data storage circuit; the DC12V supplies power to external high-definition equipment, the high-definition equipment provides a high-definition video signal coded by the LVDS serial number chip, the high-definition video signal is processed by the LVDS signal transmission anti-interference circuit, then the high-definition video signal is input to the LVDS signal serialization transmission decoding circuit to be decoded and then is provided to the CPU, and the CPU codes and decodes the high-definition video signal.
8. The vehicle-mounted intelligent information terminal according to claim 1, wherein the audio processing circuit is configured to process digital audio and video signals output by the TF card and the USB storage device, a prompt signal for a navigation application, an internet audio and video signal of a mobile phone, a voice recognition signal, and a radio audio signal processed by the detection of the digital radio circuit by a hardware decoder integrated inside the cpu; the analog signals input to the multi-channel audio decoding DSP circuit unit and modulated are output to the sound effect processing circuit.
9. The vehicle-mounted intelligent information terminal according to claim 1, further comprising a CVBS video signal hardware monitoring circuit unit for performing invalid signal frequency isolation through a capacitor, amplifying the signal amplitude through a triode amplification circuit, entering a triode, a freewheeling capacitor and a zener diode after the capacitor isolation, and outputting a stable level signal under pull-up voltage reference to perform hardware detection of the CVBS valid signal and provide an auxiliary display screen switching effect of the CPU unit.
10. The vehicle-mounted intelligent information terminal according to claim 1, wherein the CPU is further configured to decode navigation TTS voice announcement prompts, TF cards, and usb disk devices connected through the peripheral circuit unit and output the decoded navigation TTS voice announcement prompts, TF cards, and usb disk devices to the audio DSP modulation circuit unit; meanwhile, the radio unit, the MIC unit, the Bluetooth audio unit and the 4G voice signal unit of the input source are output to the audio DSP modulation circuit unit through respective processing circuits; the audio DSP modulation circuit unit performs DSP rendering characteristic processing on an audio signal input by the audio DSP modulation circuit unit and outputs the audio signal to the sound effect processing circuit, the sound effect balance processing circuit performs sound effect mode and stereo sound effect balance processing and then drives the power amplifier unit to drive an external load loudspeaker; while a subwoofer drive signal is output.
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| CN201911194500.2A CN110979208A (en) | 2019-11-28 | 2019-11-28 | Vehicle-mounted intelligent information terminal |
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| CN201911194500.2A CN110979208A (en) | 2019-11-28 | 2019-11-28 | Vehicle-mounted intelligent information terminal |
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