CN1796941B - Vehicle communication and navigation device that can realize mobile remote vehicle detection - Google Patents

Abstract

A vehicle communication navigation device capable of realizing mobile remote vehicle detection according to the present invention comprises a vehicle detection unit for detecting a pair of vehicles, a control unit for realizing control, a mobile communication unit, and a satellite positioning unit. The control unit controls and connects the vehicle detection unit, the mobile communication unit and the satellite positioning unit for sending vehicle detection information and vehicle location information to the remote service center; wherein the mobile communication unit realizes wireless mobile communication, The vehicle communication and navigation device is connected to a public mobile network to realize mobile communication with the service center. The device of the invention combines mobile communication, satellite positioning and vehicle remote detection, and realizes the convenience and timeliness of the detection and maintenance operation of automobile users, as well as the timeliness and effectiveness of transmission of vehicle failure information and maintenance information.

Description

Vehicle communication and navigation device that can realize mobile remote vehicle detection

technical field

The invention relates to a communication and navigation technology, in particular to a vehicle communication and navigation device capable of realizing mobile remote vehicle detection.

Background technique

Global Positioning System GPS (Global Positioning System) is the second generation satellite navigation system of the United States. position and velocity, and time. And it can be used by unlimited users at the same time, realizing global navigation, positioning and timing around the clock.

GPS is mainly composed of three major parts: the space segment; the control segment; and the user segment.

The space segment is a constellation composed of 24 satellites, and the current number of working satellites in orbit is often kept at about 27; the control segment is to manage, monitor and control the work of the system;

Both paragraphs above are the responsibility of the US Department of Defense (DOD). The user segment refers to the GPS user receiver, which is related to the R&D, production and service of GPS user equipment.

In the application of vehicle equipment, the existing and mature commercial GPS module is generally used. This type of module can send GPS information according to the set time, such as once per second. The GPS information is also in a specific format, such as NMEA0183 format , the vehicle-mounted device receives the GPS information sent by the GPS module and uses it after analyzing it.

The vehicle uses the GPS receiver to locate the mobile carrier and provide the driver with current accurate location information, so that the carrier's operating route can be guided according to this information.

The automobile detection technology of prior art is described below:

Since the 1960s, more and more electronic control equipment and systems have been used in automobiles. Initially, it was only used to control the engine to obtain better economy and power. Subsequently, various automobile manufacturers began to use automatic transmission control system (TCU), anti-lock braking system (ABS), airbag electronic control system (SRS), cruise control system (CC), brake anti-side Slide system (ASR) and air suspension system (AIR SUSPENSION SYSTEM), and even the auxiliary facilities such as air conditioning, audio, electric seats, doors and windows are also integrated and controlled by computer.

The automotive electronic control system has greatly improved the power, economy, safety, and comfort of the car. Therefore, its development speed is very fast and it has been widely popularized.

However, due to the electronic control of the car, it also brings new problems. On the one hand, the electronic control system of automobiles is becoming more and more complex, which brings more and more difficulties to automobile maintenance work, and the requirements for automobile maintenance technicians are getting higher and higher; on the other hand, the safety and fault-tolerant processing of electronic control systems cannot Because of the sudden failure of the electronic control system itself, the car is out of control and cannot run. In response to this situation, the designers of automotive electronic control technology have added a fault self-diagnosis function module while designing the automotive electronic control system. It can continuously monitor the working conditions of each component of the electronic control system during the running of the car. If there is any abnormality, the specific fault can be judged according to a specific algorithm, and stored or transmitted in the form of code, or the function of the corresponding fault operation module can be activated , so that the faulty car can be driven to the repair shop for maintenance in time, and the maintenance personnel can use the auto fault self-diagnosis function to call out the fault code, and quickly locate and repair the fault. After decades of development, almost all electronically controlled vehicles currently produced are equipped with a fault self-diagnosis function, which has become an indispensable and important means for fault detection of new cars leaving the factory and repair shops. The current fault self-diagnosis module can not only solve the safety of the automobile electronic control system and store and memory automobile faults, but also provide various operating parameters of the automobile in real time.

The existing vehicle testing equipment mainly has the following types:

1. Automobile fault code reader:

The device is relatively simple. It is connected with the vehicle detection socket, and it can read out the fault code stored in the vehicle electronic control system, and display the fault code by using LED or LCD display. After the display is over, It executes the clear code command to clear the fault code. The user needs to check the trouble code table to find out the location and cause of the car failure. Generally, specific car fault code readers can only be used for specific models.

2. Comprehensive vehicle testing equipment:

This kind of equipment has a certain degree of comprehensiveness. It can support the detection of this type of vehicle by adding relevant data of the corresponding vehicle type, and this type of equipment embeds information such as vehicle fault code tables and fonts, and can be connected to the vehicle detection seat. After the fault code is read out, query the fault code table, and display the content of the fault to the user in the form of text or graphics.

3. Special vehicle tester:

This kind of equipment is mostly provided by automobile manufacturers or manufacturers of specific automobile testing instruments. It is used by professional automobile maintenance personnel. It is often only capable of testing specific brands of automobiles. .

For the above-mentioned prior art automobile testing equipment, its corresponding shortcoming is:

For Automotive DTC Readers:

Its usability is poor, and the user needs to check the fault code table to find out the fault of the vehicle. And the device is limited by the output mode, the fault codes it can display are limited, and the reflection speed is slow, which limits the actual use effect of the device.

For dedicated car detectors:

The detection object is relatively single, the versatility is poor, and the volume is relatively large, and the price is relatively expensive.

For above-mentioned each equipment, all there is following shortcoming:

Since the user object of the above-mentioned equipment is the vehicle maintenance personnel, rather than the driver who controls the vehicle, it can only detect the vehicle after the vehicle enters the maintenance service point, and cannot detect the fault of the vehicle at the first time and eliminate it in time . Simultaneously, the price of above-mentioned equipment is all higher, and requires the user to have stronger professional knowledge, and the driver of vehicle all can't satisfy above-mentioned condition.

None of the above-mentioned devices can be installed in a vehicle as a device to remotely diagnose and troubleshoot a moving vehicle or guide users to troubleshoot. The above-mentioned devices cannot combine the location services of "positioning" and "navigation" and the basic services of modern transportation such as "communication" services, so as to provide users with more convenient, faster and more comprehensive services.

Most of the existing vehicle-mounted communication and navigation devices adopt the form of: main control device + wireless communication device + (GPS) positioning and navigation device; As a separate small system on the vehicle, only a small amount of information related to the working status of the vehicle can be obtained. The mobile communication of wireless communication and the location service of positioning navigation are not fully utilized to detect the state and fault of the vehicle at the first time, and the vehicle cannot be detected and rescued remotely. When a car breaks down, the vehicle can only be detected when the driver sends the vehicle to a car repair service point. The period from when the car breaks down to when it is detected and finally eliminated is long, costly, and costing the owner time. If the vehicle failure is not detected and eliminated in time, the failure will be aggravated, which will further increase the difficulty and cost of maintenance, and even cause an accident due to the vehicle continuing to drive with the failure.

Therefore, prior art still needs further improvement and development.

Contents of the invention

The object of the present invention is to provide a vehicle-mounted communication and navigation device capable of realizing mobile remote vehicle detection, which can realize vehicle detection and fault diagnosis for remote vehicles and moving vehicles through the mobile communication system in combination with the vehicle-mounted communication and navigation system. Automatically monitor the status and failure of the vehicle, display the failure of the vehicle to the driver and send it to the remote car service center using the mobile communication network, or initiate the detection of the vehicle by the driver or remotely by the car service center , to ensure that the vehicle works in a normal working state; the present invention can combine the satellite positioning function with the vehicle remote detection function, combine the location service with the vehicle remote detection service, and provide corresponding repair services and assistance.

Technical scheme of the present invention is as follows:

A vehicle communication and navigation device capable of realizing mobile remote vehicle detection, wherein the device includes a vehicle detection unit, a control unit, a mobile communication unit, and a satellite positioning unit, wherein,

The vehicle detection unit connects and controls each sensor to detect the vehicle, and obtains the vehicle detection information, and the vehicle detection information is the data of the vehicle detection for the automobile service center to analyze the data;

The satellite positioning unit uses satellites to locate the vehicle and obtain the vehicle position information;

The mobile communication unit realizes wireless mobile communication, and connects the vehicle communication navigation device to a public mobile network for transmitting the vehicle detection information, the vehicle location information and the call function;

The control unit is connected to the vehicle detection unit, the mobile communication unit and the satellite positioning unit to realize the control and function realization of each unit.

In the device, the control unit includes a processor CPU and at least one memory unit, and the processor CPU and the memory unit are connected through data, address and control buses.

The device, wherein the processor CPU provides multiple interfaces, including:

SSP bus, I2C bus, I2S bus, general-purpose serial port, USB master/slave interface, and multiple general-purpose input and output pins with editable functions.

The device, wherein the memory unit includes an SDRAM memory and a flash memory.

The device described above, wherein, the device is also controlled by the control unit to connect an input unit, a display unit, an audio unit, and a power supply and power management unit;

The control unit manages the input power through the power supply and the power management unit, and communicates and transmits with the control unit CPU through the I2C bus and realizes instruction control, so as to provide power drive for the entire circuit; the control unit respectively passes The first serial port and the second serial port realize the communication and control with the mobile communication unit and the satellite positioning unit; the control unit also realizes the transmission of audio data and the control of the audio unit through the I2S bus and the I2C bus; and through The third serial port realizes the communication connection and control with the vehicle detection unit; and realizes the communication and control of the input unit through the IO/I2C bus, and performs data display through a display unit.

The device, wherein the input unit is a keyboard or a touch screen.

The device, wherein the display unit is an LCD display unit.

Said device, wherein said mobile communication system adopts a GPRS communication module, a GSM communication module or a CDMA communication module.

Said device, wherein said satellite positioning unit is GPS satellite positioning, GLOMASS satellite positioning or Beidou satellite positioning unit.

The device, wherein, the control unit is a single board computer system, a mobile phone, a PDA or a personal computer system.

The vehicle communication and navigation device provided by the present invention can realize mobile remote vehicle detection. Based on the above technical scheme, the device of the present invention can automatically monitor the state of the vehicle and report faults to the driver and the vehicle service center in time; and can be used by The driver or the car service center initiates or regularly initiates the detection of the car; the car can be remotely detected, and the experts of the car service center will first make a preliminary judgment on the fault of the vehicle and divide the fault level according to the results of the remote detection. Different arrangements are made for different faults: Misjudged faults can be resolved, simple faults can be remotely assisted to solve the driver by telephone, etc., and general faults can be recommended to the driver to go to the vehicle maintenance service point for maintenance, etc.; Call a mobile repair service vehicle when the vehicle has a serious breakdown and is stopped. Combined with the location service of the vehicle, the automobile service center can send mobile repair service vehicles to the location for maintenance and assistance according to the vehicle location information in the information sent by the present invention, and can pre-send targeted repairs according to the detection information in the information. Personnel and maintenance equipment can be dispatched and arranged; and when a vehicle breaks down, it can be automatically searched in conjunction with the current location of the vehicle, or the car service center can provide the nearest and most suitable maintenance service point for maintenance, etc. Therefore, the device of the present invention utilizes the existing communication technology and positioning technology to realize the convenience and timeliness of the inspection and maintenance operation of the car user, as well as the timeliness and effectiveness of the transmission of vehicle failure information and maintenance information.

Description of drawings

The following description in conjunction with the accompanying drawings will make the technical solution of the present invention and its beneficial effects obvious.

Fig. 1 is the schematic diagram of the principle of the global positioning system of prior art;

Fig. 2 is a schematic diagram of the system configuration and network structure of the device of the present invention;

Fig. 3 is the communication structure diagram between each part in the device system of the present invention;

Fig. 4 is a functional block diagram of the device of the present invention;

Fig. 5 is a structural diagram of the control unit of the device of the present invention;

Fig. 6 is a concrete implementation block diagram of the mobile communication unit of the device of the present invention;

Fig. 7 is a specific implementation block diagram of the satellite positioning unit of the device of the present invention;

Fig. 8 is a specific implementation block diagram of the vehicle detection unit of the device of the present invention;

Fig. 9 is a detailed implementation description diagram of the vehicle detection unit of the device of the present invention;

Fig. 10 is a block diagram of the overall structure of the LCD display unit of the device of the present invention;

Fig. 11 is a connection and usage diagram of the audio unit of the device of the present invention;

Fig. 12 is a diagram of the use mode of the audio channel inside the audio chip of the device of the present invention;

Detailed ways

Hereinafter, the present invention will be described in detail.

The vehicle communication navigation device capable of realizing mobile remote vehicle detection of the present invention, as shown in Figure 2, is the structure of the entire system and the structure of the vehicle communication navigation device capable of realizing mobile remote vehicle detection of the present invention in the entire system Location.

The system of the vehicle communication navigation device capable of realizing mobile remote vehicle detection according to the present invention comprises: a vehicle communication navigation device 1 capable of realizing mobile remote vehicle detection, a remote vehicle service center 2, a vehicle maintenance service point 3, a Mobile repair service vehicle 4, and a mobile communication network 5, an Internet 6, and a global positioning system 7 for communicating and interconnecting and providing support for the above-mentioned equipment; wherein:

The in-vehicle communication and navigation device 1 that can realize mobile remote vehicle detection performs automatic monitoring and fault detection on vehicles, displays the vehicle detection results to the driver, and transmits the vehicle's position information and detection results to the car service center As data for further detection and provision of related services. At the same time, the device can also realize functions such as calling, wireless data exchange, and navigation.

The automobile service center 2 can actively perform remote detection on designated vehicles, and can also passively receive various data uploaded by the vehicle-mounted communication and navigation device 1 that can realize mobile remote vehicle detection. It can complete related operations based on vehicle detection and location information, including: performing remote detection based on the information uploaded by the vehicle communication and navigation device 1, and performing preliminary judgment and classification of fault levels on vehicle faults according to the results of remote detection , according to different faults, different treatments are made: misjudged faults are eliminated, simple faults can be remotely assisted to solve the driver by telephone, etc., and general faults can be recommended to the driver to go to the vehicle maintenance service point for maintenance.

The car service center can arrange a mobile repair service vehicle to be in place when the vehicle is stopped due to a serious failure, and send a mobile repair service vehicle to the location for maintenance and rescue according to the vehicle location information in the information sent by the vehicle communication and navigation device 1, And according to the detection information in the information, the dispatched personnel and maintenance equipment can be dispatched and arranged in advance.

The car service center can also provide the driver with the nearest and most suitable maintenance service point for maintenance, and communicate with the maintenance service point, provide the relevant information of the vehicle to the maintenance service point, and analyze the maintenance and follow-up process. and problem tracking service.

The vehicle maintenance service point 3 further detects and maintains the vehicle according to the vehicle detection information provided by the vehicle service center 2 and information such as vehicle owner information, vehicle model information, and vehicle history records, and reports the vehicle maintenance results and problem reports, Records and other information are fed back to the vehicle service center 2 in time and archived.

The mobile repair service vehicle 4 can make a preliminary judgment on the problem of the vehicle according to the vehicle detection information provided by the vehicle communication navigation device 1 or indirectly provided by the vehicle service center or the vehicle maintenance service point 3, and then arrange specific maintenance Personnel and equipment, and according to the vehicle location information provided by the device 1, find the vehicle for maintenance and rescue.

The mobile repair service vehicle 4 can guide or rescue the vehicle before arriving at the scene through the communication mode of the vehicle communication navigation device 1 obtained from the vehicle service center 2 through telephone, data transmission and other means.

The mobile communication network 6 can be a public communication network such as GSM/GPRS/CDMA, which provides support for the mobile communication of the device 1 .

The global positioning system 7 provides support for the positioning service of the whole system.

The basic communication between each part in the described system, as shown in Figure 3, wherein 8, 9, 10, 11, 12 is the content of the communication between each part in the system, and described vehicle-mounted communication navigation device 1 is installed in a On the vehicle, receive positioning information 12 from the satellite positioning system 7, and transmit vehicle detection information and vehicle position information 8 to the automobile service center 2 through the mobile communication system 5; The maintenance service point 3 transmits information 9 such as vehicle detection information, vehicle model information, vehicle history records, feedback maintenance results, problem reports, and records; Information 10 such as vehicle detection information, model information, vehicle history records, feedback maintenance results, problem reports, and records are sent to the mobile repair service vehicle 4, and the mobile repair service vehicle 4 can also provide service to the vehicle through the mobile communication system. The center 2 and the car maintenance service point 3 inquire about the above information, and the vehicle communication and navigation device 1 makes a phone call or data transmission to the mobile repair service car 4, and performs certain assistance 11 before the service car arrives at the scene.

The structural block diagram of the vehicle-mounted communication navigation device 1 that can realize mobile remote vehicle detection of the present invention, as shown in Figure 4, comprises: control unit 13, mobile communication unit 14, GPS satellite positioning unit 15, input unit 16, LCD display unit 17 , vehicle detection unit 18 , audio unit 19 and power supply and power management unit 20 .

in:

The control unit 13 completes the control of the entire system with the support of software, and realizes various functions of the present invention with the cooperation of various peripheral units. The control unit 13 includes a processor CPU131, memory units 132 and 133, SDRAM memory 132 and FLASH flash memory 133 can be selected, and the processor CPU131 and the memory unit are connected through data, address and control bus communication. The expression form of the control unit 13 may be a single-board computer system, or a mobile phone, PDA or personal computer system.

The processor CPU131 provides multiple interfaces, including:

Various interfaces such as SSP bus, I2C bus, I2S bus, general serial port, USB master/slave interface, and multiple general-purpose input and output pins with editable functions.

The control unit manages the input power through the power supply and the power management unit, and communicates and transmits with the control unit CPU through the I2C bus and realizes instruction control, so as to provide power drive for the entire circuit; the control unit respectively passes The first serial port and the second serial port realize the communication and control with the mobile communication unit and the satellite positioning unit; the control unit also realizes the transmission of audio data and the control of the audio unit through the I2S bus and the I2C bus; and through the first serial port The three serial ports realize the communication connection and control with the vehicle detection unit; and realize the communication and control of the input unit through the IO/I2C bus, and perform data display through a display unit.

On the basis of the processor CPU 131, the SDRAM storage unit 132 and the FLASH storage unit 133 are expanded to constitute the control unit 13, as shown in FIG. 5 . The SDRAM storage unit 132 uses an SDRAM chip with a chip data width of 16 bits, and two chips need to be used at the same time to form a 32-bit wide/64MB SDRAM storage unit 132 . The chip data width used by the FLASH storage unit 133 is 16 bits, and two chips need to be used at the same time to form a 32-bit wide/64MB FLASH storage unit 133 .

The mobile communication unit 14 realizes wireless mobile communication, and the vehicle communication navigation device 1 for mobile remote vehicle detection can be connected to the public mobile network, thereby realizing mobile communication with units such as the automobile service center; the mobile communication unit includes a GPRS communication module and an antenna, as shown in Figure 6.

The mobile communication unit 14 communicates with the control unit 13 using the AT command through a general-purpose serial port, so in the design of the present invention, the built-in first serial port 101 of the control unit 13 is used to connect with the mobile communication unit 14. TTL signal level, so there is no need for signal level conversion between them. The audio section uses analog audio to interface with the system. Its specific realization block diagram is as shown in Figure 6, the core chip of described mobile communication unit 14 provides SIM card interface, is electrically connected to a SIM card holder, and provides digital audio interface and analog audio interface, and described digital audio interface is Standby, the analog audio interface realizes the input and output of the audio codec circuit; the mobile communication unit 14 is mainly connected to a transmitting antenna, and provides a serial port for CPU communication, and provides a status indicator signal output interface.

The satellite positioning unit 15 is used to obtain satellite positioning information, realize the positioning of the vehicle, provide accurate position information to the system, and realize functions such as navigation and timing according to the positioning information, as shown in FIG. 7 .

In the design of the present invention, GPS module, GPS antenna and related accessories are used to form GPS satellite positioning unit 15, wherein the GPS module used in the present invention has 12 channels, and its positioning time is short. Its output data format can be standard NMEA 0183 format, using TTL level interface (0to3V), working temperature is -40℃to+85℃; power consumption is less than 200mW. This module is suitable for in-vehicle equipment.

Because this GPS satellite positioning unit 15 uses a standard serial port to communicate with the control unit 13, and it does not need flow control, it only needs 3-wire serial port communication, so in the device of the present invention, the second serial port 102 of the control unit 13 is used to communicate with the control unit 13. For communication, both use TTL signal level, so there is no need for signal level conversion between them. The specific implementation block diagram of this unit is shown in FIG. 7 , and the satellite positioning unit 15 is powered by the power supply and power management unit 20 .

The vehicle detection unit 18 serves as an interface conversion, operation realization and data acquisition device connecting the vehicle diagnostic interface and the control unit 13 . The vehicle detection unit 18 is connected to the detection and diagnosis seat of the vehicle itself, and sends the information to the control unit 13 for analysis and processing in a timely manner after the vehicle fault code is produced by means of polling; Instructions to perform related operations on the vehicle diagnostic interface.

Since there are common basic units such as control unit 13, mobile communication unit 14, LCD display unit 17, etc. in the vehicle communication navigation device 1 that can realize mobile remote vehicle detection, the functions of analysis, decoding, display and transmission of fault codes can be obtained by Above-mentioned unit realizes, and, because the vehicle diagnosis interface of each brand and each model automobile has its specific format and agreement at present, need to customize specific hardware interface and related agreement etc. for this type of vehicle, so, in the device of the present invention , in order to minimize the impact of the differences in vehicle types on the entire system hardware and reduce the coupling degree between the entire system hardware and the vehicle interface, the vehicle detection unit 18 is separated as much as possible.

Therefore, the vehicle detection unit 18 realizes the connection with the vehicle-related interface and can send the vehicle fault code to the control unit 13 for processing in time, and can respond to the instructions of the control unit 13 to perform related operations, such as detection commands.

The above requirements are combined with the requirements of "reducing the coupling degree between the system hardware and the vehicle interface, and making the vehicle detection unit independent as much as possible". The unit CPU 21 controls the vehicle detection unit 18. The vehicle detection unit CPU completes the control of the vehicle detection unit interface adaptation circuit 22 and regularly or controlled scanning of fault codes on the vehicle diagnostic socket to realize the detection of the vehicle. At the same time, The vehicle detection unit CPU21 communicates with the third serial port 103 of the control unit 13 using a general-purpose three-wire serial port, receives instructions from the control unit 13 and sends the information and data of vehicle detection to the control unit 13, and the control unit 13 according to its internal storage The fault code table and other vehicle detection data are analyzed and the results are displayed to the driver or sent to the car service center by the mobile communication unit 14 for further analysis.

By adopting the above-mentioned architecture, the hardware of the vehicle detection unit 18 is relatively independent, which reduces the coupling degree of the vehicle detection hardware and the entire system hardware. 18 to make changes. At the same time, the vehicle detection unit CPU 21 of the vehicle detection unit 18 completes the real-time monitoring of vehicle faults, sharing part of the work of the control unit 13 and reducing its load.

The vehicle detection unit interface adaptation circuit 22 is connected to a vehicle detection and diagnosis seat 23, which is controlled by the vehicle detection unit CPU21, and can realize the switching of detection circuits for different automobiles and the conversion of detection signal levels, thereby converting The vehicle detection and diagnosis signal is converted into a signal that can be received by the vehicle detection unit CPU21.

Because the vehicle detection signals of different automobiles adopt different levels, so in order to allow the vehicle detection unit interface adaptation circuit 22 to adapt to multiple levels, the power supply in the system of the present invention and the power management unit 20 provide the vehicle detection unit with 18 can provide multiple different voltages.

Described vehicle detection unit 18 is to the detection process of automobile as shown in Figure 9: the automobile computer monitoring system 28 on the automobile monitors each sensor 27 on the automobile, as engine sensor, gearbox sensor, ABS sensor, safety air bag sensor And so on, to get the working status and fault related information of each system in the car. The vehicle detection unit interface adaptation circuit 22 is connected to the vehicle detection and diagnosis socket 23 through a specific matching cable/plug 24 corresponding to a specific vehicle type. The matching cable/plug 24 can be customized according to the vehicle type and can be replaced.

Since the hardware circuits required by various vehicle models are not the same, when using one vehicle detection unit 18 to adapt to multiple vehicle models, it is necessary to switch between the various hardware circuits. The detection circuit switching circuit 25 plays the above functions, and in the present invention, multiple relays are used to realize the above functions.

A detection signal level conversion circuit 26 is used to convert the signal level output by the vehicle detection and diagnosis socket 23 and the signal level sent to the vehicle detection unit CPU21. In the design of the present invention, a level conversion chip is used to realize the above functions.

The vehicle detection unit CPU21 realizes the control of the vehicle detection unit 18 of the vehicle. In this embodiment, the 89C58 is used as the vehicle detection unit CPU, and the vehicle detection unit CPU completes the control of the vehicle detection unit interface adaptation circuit 22 and Timed or controlled scanning of fault codes on the vehicle diagnostic socket to realize vehicle detection, and at the same time, the vehicle detection unit CPU21 communicates with the third serial port 103 of the control unit 13 through a general-purpose three-wire serial port and accepts its control instructions.

In summary, the entire working process of the vehicle detection unit is as follows: the vehicle computer monitoring system 28 collects and monitors the status of each sensor 27 of the vehicle, and outputs vehicle status and fault information through the vehicle detection and diagnosis socket 23 . In the vehicle detection unit 18, through the setting given by the control unit 13, the detection circuit switching circuit 25 is designated to select a specific detection signal level conversion circuit 26 suitable for the vehicle type, and the vehicle status and fault information are transmitted through the vehicle. The detection and diagnosis socket 23 reads out and sends to the control unit 13 for processing through the serial port according to the communication protocol.

The general block diagram of described LCD display unit 17 is as shown in Figure 10, and in described LCD display unit 17, the relevant signal that the LCD controller in the control unit 13 provides passes through the conversion of described LCD timing control 13, obtains and sends Data and clock signal for LCD screen. The power supply and power management unit 20 provides the LCD display unit 17 with a DC voltage of 5-14V, which is converted into high-voltage AC power by the CCFL backlight driver 30 for the backlight drive of the LCD liquid crystal screen 32, and the voltage is given by the control unit 13 at the same time. The PWM signal control, which can control the brightness of the CCFL backlight. The DC drive circuit 29 can convert the reference voltage +8.4V to obtain multiple channels of DC reference voltages for the LCD screen.

The backlight driving voltage requirements of the backlight circuit when using a 7-inch LCD are as follows:

Table 1

Input voltage Output open circuit voltage Output working voltage Output current Backlight power consumption (typical value) working frequency 5VDC～14VDC Maximum 1300Vrms Typical 500Vrms 2～8mA 3W 30～90KHZ

The audio unit 19 is used to complete the audio codec function. It receives the audio data from the control unit 13, and plays the sound through a loudspeaker or earphone through D/A conversion, or outputs it as an audio signal for the car audio to play; on the other hand , can receive the analog input from the microphone, and transmit the sound data to the control unit 13 through A/D conversion. In addition, switching of multiple audio channels is required to realize the input and output of audio from the mobile communication unit 14 .

In the design of the present invention, the audio unit 19 uses an audio codec chip, and its connection and use in the system is shown in FIG. 11 .

Since the audio decoding chip has multiple input and output channels, and the chip can realize the optional connection of each channel during use. Therefore, in the design of the present invention, in addition to converting the digital audio signal sent by the control unit 13 into an analog audio signal output and converting the analog audio signal input into a digital audio signal and sending it to the control unit 13, the audio decoding chip The switching of each audio input and output channel is also implemented inside, so that the audio input and output devices of the terminal system can share this part of the circuit when the mobile communication unit 14 needs to talk. The specific method can be seen in Figure 12.

Finally, in order to improve the driving ability of the built-in speaker, a first-level audio power amplifier is added after the out2 audio output terminal of the audio codec chip, using LM4890M.

The in-vehicle communication and navigation device capable of realizing mobile remote vehicle detection in the present invention can automatically monitor the state of the vehicle, and combined with the vehicle state and fault detection initiated by the user/car service center, can report the fault to the driver and the car service center in time , helping to eliminate the fault as soon as possible and avoiding the further development and deterioration of the fault, reducing the probability that the vehicle will continue to run with the fault and improving the safety of driving; The cost of vehicle maintenance.

The device of the present invention supports the moving detection and remote detection of automobiles, and the professional instruments and personnel of the automobile service center can be used to conduct preliminary judgment and division of fault levels on vehicle faults, and make different arrangements according to different faults: misjudgment For simple faults, the driver can be remotely assisted to solve them by telephone or other means. For general faults, the driver can be recommended to go to the vehicle maintenance service point for maintenance. Try to "prescribe the right medicine" to reduce the false alarm rate of vehicle failures, assist drivers to solve simple failures by themselves, save the driver's time and maintenance costs, and can realize basic remote maintenance guidance.

Combining satellite positioning with vehicle detection and mobile communication, making full use of location services and mobile communication functions, combining location information when a car breaks down to recommend the nearest or most suitable car repair service point, or when the car is stopped due to a breakdown, it can According to the location information of the vehicle, mobile repair service vehicles are excluded to go to rescue, and the dispatched personnel and maintenance equipment can be dispatched and arranged in advance according to the detection information in this information, so that the maintenance process is fast and reasonable, and more Scientific and information-based services.

In the device of the present invention, the automobile service center can carry out informatization management on the information reported by the vehicle. In addition to providing services to the driver, it can also provide the relevant information of the vehicle to the maintenance service point, and carry out maintenance and follow-up processes and problems. tracking service. The car repair service point conducts further inspection and repair of the vehicle according to the vehicle inspection information provided by the auto service center, as well as the owner information, model information, vehicle history records, etc., and feeds back the inspection results, problem reports, records and other information to Vehicle service center and file. The entire process is informatized and digitized, and all processes are recorded, which improves efficiency, enhances management, and helps reduce costs.

The above-mentioned information sent to the automobile service center by the device of the present invention includes: data on vehicle detection, for the automobile service center to analyze the data, so as to realize vehicle detection and troubleshooting. Contains the current location information of the vehicle, which is used by the car service center to arrange services such as detection and repair of the faulty vehicle.

It can be seen that the device of the present invention combines mobile communication, satellite positioning and vehicle remote detection, so that the functions of each part can be brought into full play, and it is useful for users, drivers, car service centers and car repair service points. Strong use function and good use effect.

It should be understood that the above descriptions of the present invention for specific embodiments are too specific, and should not be construed as limiting the scope of patent protection of the present invention, and the scope of patent protection should be determined by the appended claims.

Claims (10)

1. the vehicle mounted communication guider that can realize that mobile remote automobile detects is characterized in that described device comprises a vehicle detection unit, a control module unit, and a mobile communication unit and a satnav unit, wherein,

Described vehicle detection unit connects each sensor of control described vehicle is detected, and obtains described vehicle detecting information, and the data of described vehicle detecting information for vehicle is detected are for analyzing at these data the automobile service center;

Described satnav unit by using satellite obtains described vehicle position information to described vehicle location;

Radio mobile communication is realized in described mobile communication unit, and described vehicle mounted communication guider is inserted public mobile network, is used to transmit described vehicle detecting information and described vehicle position information and call function;

Described control module connects described vehicle detection unit, described mobile communication unit and described satnav unit, realizes that the control of each unit and function realize.

2. device according to claim 1 is characterized in that, described control module comprises a processor CPU, at least one memory cell, is connected by data, address, control bus communication between described processor CPU and the described memory cell.

3. device according to claim 2 is characterized in that, described processor CPU provides multiple interfaces, comprising:

But the general input and output pin of SSP bus, I2C bus, I2S bus, universal serial port, the master/slave interface of USB and a plurality of editting functions.

4. device according to claim 2 is characterized in that, described memory cell comprises a SDRAM storer and a flash memory.

5. device according to claim 4 is characterized in that, described device also has an input block, a display unit, an audio unit and a power supply and Power Management Unit by described control module control linkage;

Described control module is managed the power supply of importing by described power supply and Power Management Unit, and communicates transmission and realize instruction control by described I2C bus and described control module CPU, for entire circuit provides driven by power; Described control module is communicated by letter and control with described mobile communication unit and described satnav unit by first serial, second serial realization respectively; Described control module is also realized the transmission of voice data by I2S bus and I2C bus and to the control of audio unit; And communicating to connect and controlling by realization of one the 3rd serial ports and described vehicle detection unit; And pass through communication and the control that the IO/I2C bus realizes input block, and carry out data presentation by a display unit.

6. device according to claim 5 is characterized in that, described input block is keyboard or touch-screen.

7. device according to claim 5 is characterized in that, described display unit is the LCD display unit.

8. device according to claim 1 is characterized in that, described mobile communication system adopts GPRS communication module, GSM communication module or CDMA communication module.

9. device according to claim 1 is characterized in that, described satnav unit is gps satellite location, GLOMASS satnav or big-dipper satellite positioning unit.

10. device according to claim 1 is characterized in that, described control module is single card microcomputer system, mobile phone, PDA or personal computer system.

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