CN104729513A - Vehicle-mounted automatic diagnostic system and terminal as well as transmission method of GPS positioning data - Google Patents
Vehicle-mounted automatic diagnostic system and terminal as well as transmission method of GPS positioning data Download PDFInfo
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- CN104729513A CN104729513A CN201510153041.9A CN201510153041A CN104729513A CN 104729513 A CN104729513 A CN 104729513A CN 201510153041 A CN201510153041 A CN 201510153041A CN 104729513 A CN104729513 A CN 104729513A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C21/00—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00
- G01C21/26—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00 specially adapted for navigation in a road network
- G01C21/28—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00 specially adapted for navigation in a road network with correlation of data from several navigational instruments
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/38—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system
- G01S19/39—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system the satellite radio beacon positioning system transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/42—Determining position
- G01S19/45—Determining position by combining measurements of signals from the satellite radio beacon positioning system with a supplementary measurement
- G01S19/46—Determining position by combining measurements of signals from the satellite radio beacon positioning system with a supplementary measurement the supplementary measurement being of a radio-wave signal type
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- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Computer Networks & Wireless Communication (AREA)
- Navigation (AREA)
- Position Fixing By Use Of Radio Waves (AREA)
- Traffic Control Systems (AREA)
Abstract
The invention discloses a vehicle-mounted automatic diagnostic system and a vehicle-mounted automatic diagnostic terminal. A gyroscope sensor and an AGPS chip are additionally arranged; by combining the gyroscope sensor and an acceleration sensor, full motion of a three-dimensional space can be tracked and captured well, and user use experience having a strong scene feeling and an accurate navigation system are provided for a final user, particularly, the sudden turning of vehicles can be judged more accurately. The AGPS chip can cooperate with a traditional GPS satellite by utilizing information of a mobile phone base station, so that the positioning speed is relatively high. According to the transmission method of the GPS positioning data provided by the invention, a GPS positioning data frame is converted into an integer frame, and differential encoding on the integer frame is carried out, so that a storage space of the GPS positioning data can be effectively reduced, the data throughput is reduced, and the data transmission velocity is greatly increased, thus obviously shortening the vehicle positioning time.
Description
Technical field
The invention belongs to vehicle monitoring field, particularly the transmission method of a kind of OBD and terminal and GPS locator data.
Background technology
OBD (On Board Diagnostics, OBD) can in car running process the working condition of other functional module on Real-Time Monitoring engine electric-controlled system and vehicle, as being found work condition abnormality, then judge concrete fault according to specific algorithm, and be stored on intrasystem storer with the form of DTC (DiagnosticTrouble Codes, diagnostic trouble code (DTC)).The useful information obtained after system autodiagnosis can be offered help for the maintenance process simulation of vehicle, maintenance personal can utilize original factory of vehicle instrumentation read failure code, thus quick position can be carried out to fault, so that the repairing to vehicle, reduce the time of Artificial Diagnosis.
Terminal in existing OBD not only possesses vehicle diagnosis function, is also got up by the function i ntegration such as positioning service, driving habits, oil consumption statistics, is better user's service.But existing mounted automatic diagnosis terminal, when vehicle takes a sudden turn, can only be judged roughly by GPS direction, may there is erroneous judgement, cause Consumer's Experience bad.And vehicle is when locating, first positioning time is long, thus causes a part of wheelpath easily to be lost.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of zig zag to vehicle and judges more precisely and the transmission method of the OBD that just positioning time is shorter and terminal and GPS locator data.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is:
A kind of mounted automatic diagnosis terminal, comprise box body, it is built with printed circuit board (PCB), the acceleration transducer this printed circuit board (PCB) being provided with master controller and be connected with this master controller, wireless communications chips, GPS chip and transmit linear speed, described printed circuit board (PCB) is also provided with described acceleration transducer with the use of gyro sensor and the assisting vehicle AGPS chip of locating, described gyro sensor is all connected with described master controller with described AGPS chip.
Preferably, described gyro sensor is three-axis gyroscope sensor.
Preferably, described master controller is MCU controller.
Preferably, described master controller is the MCU controller based on STM32F103RDT6 framework.
Preferably, containing GPRS wireless transport module or 3G module in described wireless communications chips.
Preferably, also interior containing bluetooth module in described wireless communications chips.
Preferably, described transmission wire harness is CAN and/or Kline bus.
A kind of OBD, comprise Cloud Server, it is characterized in that: this system also comprises the mounted automatic diagnosis terminal according to any one of claim 1 to 7, the travelling data collected, vehicle safety status data and GPS locator data are transferred to described Cloud Server by this mounted automatic diagnosis terminal.
A transmission method for GPS locator data, comprising:
GPS chip and AGPS chip generate GPS locator data frame;
Described GPS locator data frame is converted to integer frame;
Key frame is obtained according to the first frame in described integer frame;
Difference according to the second frame in described integer frame and described first frame obtains first residual frame;
Difference according to the N+1 frame in described integer frame and N frame obtains N number of residual frame, described N be more than or equal to 2 integer;
Described key frame and described residual frame are arranged in order the coded sequence obtaining default frame structure;
By described coded sequence by transmission to Cloud Server.
Preferably, described key frame comprises three sign bits, store in longitude, latitude and elevation information in each described sign bit, described sign bit respectively by the plus or minus of symbol on east longitude or west longitude, south latitude or north latitude, sea level or distinguish under sea level.
A kind of OBD provided by the present invention and terminal, gyro sensor and AGPS chip are installed additional, combination gyro sensor and acceleration transducer can be followed the tracks of better and catch three-dimensional entire motion, for user's experience, accurate navigational system that final user provides presence stronger, particularly more accurate to the judgement of vehicle zig zag.AGPS chip can utilize the information of mobile phone base station, coordinates traditional gps satellite, makes the speed of location faster.GPS locator data frame is converted to integer frame by the transmission method of a kind of GPS locator data of the present invention, and differential coding is carried out to integer frame, effectively can reduce the storage space of GPS locator data, reduce data processing amount, greatly improve message transmission rate, and then clearly shorten the vehicle location time.
Accompanying drawing explanation
The schematic diagram of the mounted automatic diagnosis terminal that Fig. 1 provides for the embodiment of the present invention.
The structural drawing of the coded sequence of frame is preset in the transmission method of a kind of GPS locator data that Fig. 2 provides for the embodiment of the present invention;
The process flow diagram of the transmission method of a kind of GPS locator data that Fig. 3 provides for the embodiment of the present invention.
In Fig. 1, Reference numeral is: 1-printed circuit board (PCB), 2-master controller, 3-acceleration transducer, 4-wireless communications chips, 5-GPS chip, 6-transmit wire harness, 7-gyro sensor, 8-AGPS chip.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail:
As shown in Figure 1, a kind of mounted automatic diagnosis terminal provided by the invention, it comprises box body, box body is built with printed circuit board (PCB) 1, the acceleration transducer 3 this printed circuit board (PCB) 1 being provided with master controller 2 and be connected with this master controller 2, wireless communications chips 4, GPS chip 5, transmit linear speed 6, gyro sensor 7 and AGPS (Assisted Global Positioning System, be called for short: AGPS, auxiliary global satellite positioning system) chip 8.Master controller 2 is MCU (MicrocontrollerUnit, micro-control unit, i.e. single-chip microcomputer) controller, and it can be embedded in mounted automatic diagnosis terminal better, simplifies electronic circuit.In the present embodiment, the MCU controller of STM32F103RDT6 framework is preferably based on.Transmission wire harness 6 can be selected CAN or Kline bus or select these two kinds of buses to be connected with vehicle simultaneously, and CAN performance is high and safe and reliable, and Kline bus cost is low, and both can have complementary advantages.Gyro sensor 7 is three-axis gyroscope sensor, it can measure the angular velocity moved along three axles, can be formed with acceleration transducer and have complementary advantages, combinationally use acceleration transducer and gyro sensor can be followed the tracks of better and catch three-dimensional entire motion, for user's experience, accurate navigational system that final user provides presence stronger, particularly more accurate to the judgement of vehicle zig zag.AGPS chip 8 can utilize the information of mobile phone base station, coordinates traditional gps satellite, makes the speed of location faster.Common gps system is made up of gps satellite and GPS receptacle.Different from common GPS, AGPS also has a secondary server in systems in which.In AGPS network, can not obtain desirable locating effect owing to being subject to the impact of receiver operation power and geographic position, receptacle often to communicate and access network with there being the secondary server of higher-wattage.Although relevant with the coverage of cellular system, due to the task sharing between AGPS receiver and secondary server, so AGPS is often faster than common gps system processing speed, there is higher efficiency.Containing GPRS wireless transport module or 3G module in wireless communications chips 4, vehicle data can be passed to the Cloud Server in OBD by wireless network.Along with comprehensive covering of 4G network, also can install 4G module additional in wireless communications chips 4, data rate can be made so faster.Also interior containing bluetooth module in wireless communications chips 4, because Bluetooth technology short haul connection effect is excellent, therefore be convenient to mounted automatic diagnosis terminal and mobile terminal (as smart mobile phone, panel computer etc.) carries out data communication, human pilot obtains travelling data, the safe state data and locating information etc. of vehicle by mobile terminal.
The present invention also provides a kind of OBD, it comprises above-mentioned mounted automatic diagnosis terminal and Cloud Server, mounted automatic diagnosis terminal is installed in car body, exchanges data is carried out by the Cloud Server in GPRS module in wireless communications chips 4 or 3G module and OBD, data communication is carried out by bluetooth module and smart mobile phone, gyro sensor 7 and AGPS chip 8 has been installed additional in mounted automatic diagnosis terminal, combination gyro sensor 7 and acceleration transducer 3 can be followed the tracks of better and catch three-dimensional entire motion, for user's experience that final user provides presence stronger, accurate navigational system, particularly more accurate to the judgement of vehicle zig zag.AGPS chip 8 can utilize the information of mobile phone base station, coordinates traditional gps satellite, makes the speed of location faster.
In above-mentioned OBD, mounted automatic diagnosis terminal needs the travelling data gathering automobile in time, as engine speed, the speed of a motor vehicle, battery voltage, the real time datas such as oil consumption, the safe state data of automobile, as anxious acceleration, anxious deceleration, the real time datas such as zig zag, also need to process GPS locator data in time, if ensure the traval trace of enough accuracy, need the sampling rate of enough gps datas, the two is the contradiction of relatively giving prominence to for a pair.If data sampling rate is higher, data volume is too large, is all larger challenge to customer charge and the network bandwidth.The frame data amount that have employed 1 second in implementation procedure, location longitude reaches 2 meters.In numerous types of data, the data volume of GPS locator data is relatively large, and shared ratio is about 90%, so need to adopt following method to transmit to GPS locator data, as shown in Figure 3, the particular content of the method is as follows for the process flow diagram of this method:
Step 101, GPS chip 5 and AGPS chip 8 generate GPS locator data frame.
Wherein, the form of raw GPS positioning data frame is see the $ GPRMC of NMEA-0183 standard and $ GPGGA, and storage mode is ASCII character, i.e. character string forms.Can completion timing, location condition under, raw GPS positioning data frame at least need to carry latitude, longitude, highly, speed, direction, the time, the date, thing through 9 field informations such as mark, north and south latitude marks, need the storage space taken to be at least 50 bytes.
Step 102, is converted to integer frame by described GPS locator data frame.
The storage mode of each field of above-mentioned raw GPS positioning data frame is converted to signed integer to represent from ASCII character, wherein, longitude and thing can represent with of a tape symbol position integer through two fields, following conversion regime can be adopted: first divide expression degree of being converted into represent (decimal) original employing degree, and then expand 1000000 times, then be converted to employing degree and represent (integer).
In order to more clearly be described transfer process, be exemplified below:
Original longitude and latitude form (degree point represents) near the bridge of Shangdi, Beijing is: longitude is 11618.7129, and thing is through being E, and latitude is 4002.2655, and north and south latitude is N, totally 21 bytes;
Degree of being converted to represents (decimal): north latitude 40.037759 degree, east longitude 116.311883;
After expanding 1000000 times, i.e. north latitude 40037759, east longitude 116311883, just can represent latitude and longitude by two signed integers respectively, takies 8 bytes after adopting integer representation.
After conversion process, latitude and longitude information is from representing with integer representation by ASCII character, and the storage space of latitude and longitude information from 21 byte-code compression to 8 bytes, thus effectively reduces storage space.
Like this, from ASCII character, GPS locator data frame data represent that the storage space of employing integer representation each field needs is as follows:
Longitude+thing, through (11 byte) → signed integer longitude (4 bytes), is being just east longitude, is bearing as west longitude;
Latitude+north and south latitude (10 byte) → signed integer longitude (4 bytes), is being just north latitude, is bearing as south latitude;
Highly (6 bytes) → tape symbol short integer (2 bytes), positive number represents on sea level, under negative number representation sea level;
Speed (4 bytes) → without symbol-byte (1 byte);
Direction (3 bytes) → unsigned short integer (2 bytes);
Time and date (16 bytes) → signless integer (4 bytes).
After above-mentioned process, raw GPS positioning data frame 1, raw GPS positioning data frame 2, raw GPS positioning data frame 3, .. raw GPS positioning data frame N, raw GPS positioning data frame N+1, just can be expressed as: integer frame 1, integer frame 2, integer frame 3 ... integer frame N, integer frame N+1 ...
Due to the raw GPS positioning data frame of real-time reception is converted to integer frame, compressed encoding process can be carried out to a small amount of gps data, effectively can improve response speed.
Step 103, obtains key frame according to the first frame in the described integer frame of step 102.
Step 104, the difference according to the second frame in the described integer frame of step 102 and described first frame obtains first residual frame.
Step 105, the difference according to the N+1 frame in the described integer frame of step 102 and N frame obtains N number of residual frame, described N be more than or equal to 2 integer.
Step 106, described key frame and described residual frame are arranged in order the coded sequence obtaining default frame structure, as shown in Figure 2.Described key frame comprises three sign bits, stores in longitude, latitude and elevation information in each sign bit, sign bit respectively by the plus or minus of symbol on east longitude or west longitude, south latitude or north latitude, sea level or distinguish under sea level.In this coded sequence, key frame can adopt frame number to encode, relative to text data, compressibility reaches 30%, and residual frame is as intermediate frame, and compressibility is about 60%, thus make overall compressibility about 80%, effectively can reduce data space, in addition, channel capacity can be calculated easily because compressibility is fixing.
In the present embodiment, described key frame is arranged to the as shown in the table structure taking 19 bytes:
Described residual frame is arranged to the as shown in the table structure taking 9 bytes:
Step 107, the coded sequence in step 106 by transmission to Cloud Server.
After employing said method, the data volume of p.s. is (19+9*59=550bytes) about 600 bytes.The amount of GPS data of the transmission that existing OBD has is little, but gps data sampling rate low (10Hz or 20Hz); Its gps data sampling precision of some OBDs reaches 1Hz, but data volume is about 3000 bytes.OBD gps data sampling precision of the present invention reaches 1Hz, and data volume is about 600 bytes, greatly improves message transmission rate, and then clearly shortens the vehicle location time.
In sum, content of the present invention is not limited in the above-described embodiments, and those skilled in the art can propose other embodiment easily according to guiding theory of the present invention, and these embodiments all comprise within the scope of the present invention.
Claims (10)
1. a mounted automatic diagnosis terminal, comprise box body, it is built with printed circuit board (PCB), the acceleration transducer this printed circuit board (PCB) being provided with master controller and be connected with this master controller, wireless communications chips, GPS chip and transmit linear speed, it is characterized in that: described printed circuit board (PCB) is also provided with described acceleration transducer with the use of gyro sensor and the assisting vehicle AGPS chip of locating, described gyro sensor is all connected with described master controller with described AGPS chip.
2. mounted automatic diagnosis terminal according to claim 1, is characterized in that: described gyro sensor is three-axis gyroscope sensor.
3. mounted automatic diagnosis terminal according to claim 1, is characterized in that: described master controller is MCU controller.
4. mounted automatic diagnosis terminal according to claim 3, is characterized in that: described master controller is the MCU controller based on STM32F103RDT6 framework.
5. mounted automatic diagnosis terminal according to claim 1, is characterized in that: containing GPRS wireless transport module or 3G module in described wireless communications chips.
6. mounted automatic diagnosis terminal according to claim 5, is characterized in that: also interior containing bluetooth module in described wireless communications chips.
7. mounted automatic diagnosis terminal according to claim 1, is characterized in that: described transmission wire harness is CAN and/or Kline bus.
8. an OBD, comprise Cloud Server, it is characterized in that: this system also comprises the mounted automatic diagnosis terminal according to any one of claim 1 to 7, the travelling data collected, vehicle safety status data and GPS locator data are transferred to described Cloud Server by this mounted automatic diagnosis terminal.
9. a transmission method for GPS locator data, is characterized in that, comprising:
GPS chip and AGPS chip generate GPS locator data frame;
Described GPS locator data frame is converted to integer frame;
Key frame is obtained according to the first frame in described integer frame;
Difference according to the second frame in described integer frame and described first frame obtains first residual frame;
Difference according to the N+1 frame in described integer frame and N frame obtains N number of residual frame, described N be more than or equal to 2 integer;
Described key frame and described residual frame are arranged in order the coded sequence obtaining default frame structure;
By described coded sequence by transmission to Cloud Server.
10. the transmission method of GPS locator data according to claim 9, is characterized in that:
Described key frame comprises three sign bits, store in longitude, latitude and elevation information in each described sign bit, described sign bit respectively by the plus or minus of symbol on east longitude or west longitude, south latitude or north latitude, sea level or distinguish under sea level.
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Cited By (5)
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| CN105158593A (en) * | 2015-07-30 | 2015-12-16 | 成都亿盟恒信科技有限公司 | Self-checking device based on vehicle-mounted wireless positioning terminal and self-checking method |
| CN105783890A (en) * | 2016-03-15 | 2016-07-20 | 北京市市政工程设计研究总院有限公司 | Method and device for acquiring horizontal alignment and vertical alignment of road on basis of vehicle-mounted self-diagnosis system |
| CN106501834A (en) * | 2016-10-11 | 2017-03-15 | 上海保橙网络科技有限公司 | A kind of method of use mobile phone automatic decision user movement behavior |
| CN108931794A (en) * | 2018-04-13 | 2018-12-04 | 东风商用车有限公司 | A kind of blind area vehicle positioning system and its control method |
| CN109951820A (en) * | 2019-02-25 | 2019-06-28 | 深圳市元征科技股份有限公司 | A kind of data transmission method and relevant apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106501834A (en) * | 2016-10-11 | 2017-03-15 | 上海保橙网络科技有限公司 | A kind of method of use mobile phone automatic decision user movement behavior |
| CN108931794A (en) * | 2018-04-13 | 2018-12-04 | 东风商用车有限公司 | A kind of blind area vehicle positioning system and its control method |
| CN109951820A (en) * | 2019-02-25 | 2019-06-28 | 深圳市元征科技股份有限公司 | A kind of data transmission method and relevant apparatus |
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Application publication date: 20150624 |