CN109448159A - A kind of vehicle information terminal - Google Patents
A kind of vehicle information terminal Download PDFInfo
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- CN109448159A CN109448159A CN201811619713.0A CN201811619713A CN109448159A CN 109448159 A CN109448159 A CN 109448159A CN 201811619713 A CN201811619713 A CN 201811619713A CN 109448159 A CN109448159 A CN 109448159A
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C5/00—Registering or indicating the working of vehicles
- G07C5/008—Registering or indicating the working of vehicles communicating information to a remotely located station
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C5/00—Registering or indicating the working of vehicles
- G07C5/08—Registering or indicating performance data other than driving, working, idle, or waiting time, with or without registering driving, working, idle or waiting time
- G07C5/0808—Diagnosing performance data
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C5/00—Registering or indicating the working of vehicles
- G07C5/08—Registering or indicating performance data other than driving, working, idle, or waiting time, with or without registering driving, working, idle or waiting time
- G07C5/0841—Registering performance data
- G07C5/085—Registering performance data using electronic data carriers
- G07C5/0858—Registering performance data using electronic data carriers wherein the data carrier is removable
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Abstract
The embodiment of the invention discloses a kind of vehicle information terminals, including master controller and the CAN interface circuit being connect with master controller, GPS interface circuit, GPRS interface circuit and TF card interface circuit, the terminal further includes power circuit, and the power circuit is used to power to the master controller, CAN interface circuit, GPS interface circuit, GPRS interface circuit and TF card interface circuit.The present invention is from the source of data, the acquisition to vehicle traveling information is realized by CAN interface circuit and vehicle position information is obtained by GPS positioning, it combines both, be back to remote server platform by GPRS communication module, realize to vehicle it is more efficient, more targetedly analyze；Simultaneously either for large-scale fleet or dealer, them are strengthened for the intelligent management and monitoring capacity of vehicle.
Description
Technical field
The present invention relates to information of vehicles processing technology field, specifically a kind of vehicle information terminal.
Background technique
Nowadays automobile data recorder on the market is numerous and complicated heterogeneous, can only mostly realize simple positioning, does not accomplish more
Deepen into application, be difficult effectively to manage vehicle for large-scale fleet and dealer, and how will
Information of vehicles and location information are acquired and can be returned, and are enabled users to carry out from obtained data more to have and are directed to
The analysis, such as Fuel consumption analysis, vehicle driving position analysis etc. of property, this is necessary.
Summary of the invention
A kind of vehicle information terminal is provided in the embodiment of the present invention, to solve the information data palm of vehicle in the prior art
The problem of holding less, being unfavorable for vehicle management.
In order to solve the above-mentioned technical problem, the embodiment of the invention discloses following technical solutions:
The present invention provides a kind of vehicle information terminals, including master controller and the CAN interface connecting with master controller electricity
Road, GPS interface circuit, GPRS interface circuit and TF card interface circuit, the terminal further include power circuit, the power circuit
For to the master controller, CAN interface circuit, GPS interface circuit, GPRS interface circuit and the power supply of TF card interface circuit.
Further, the chip model of the master controller is STM32F103.
Further, the CAN interface circuit includes transceiver U41, pin 1 and pin 4 difference of the transceiver U41
It is connect with master controller, the pin 2 of transceiver U41 is separately connected one end and the ground terminal of capacitor 41C1, the pin of transceiver U41
3 are separately connected the other end of power supply and capacitor 41C1, and the pin 6 and pin 7 of transceiver U41 is separately connected CAN common-mode filter
The pin 8 of 2 feet and 1 foot of 41CMF1, transceiver U41 is grounded, and 3 feet of CAN common-mode filter 41CMF1 are CAN-N route, CAN
4 feet of common-mode filter 41CMF1 are CAN-P route, and 3 feet of CAN common-mode filter 41CMF1 are separately connected two-way two pole of breakdown
One end of pipe D41B and one end of resistance 41R1,4 feet of CAN common-mode filter 41CMF1 are separately connected diac
One end of D41A and the other end of resistance 41R1, the other end of diac D41A and diac D41B's
The other end is grounded.
Further, the TF card interface circuit uses the SDIO interface J_TF of STM32 integrated chip, the SDIO interface
Pin 1, pin 2, pin 3, pin 5, pin 7 and the pin 8 of J_TF is all connected with master controller, and the SDIO interface J_TF's draws
Foot 8, pin 7, pin 5, pin 3, pin 2, pin 1 are connected by resistance 5R1C, 5R1D, 5R2A, 5R2B, 5R1A, 5R1D respectively
It is connected to 3.3v power end.
Further, the GPS interface circuit includes GPS chip U22, and the pin 21 and pin 20 of the chip U22 divides
Not Tong Guo resistance 22R3 with 22R4 connect master controller；The pin 15 and pin 14 of chip U22 respectively by resistance 22R5 and
22R6 connection ground terminal；Pin 7, pin 10, pin 12 and the pin 13 of chip U22 connects ground terminal；The pin 24 of chip U22
It is separately connected one end of capacitor 22C3, one end of capacitor 22C4 and ground terminal, capacitor 22C3 and connects 3.3v with the other end of 22C4
Power end；The pin 23 of chip U22 is separately connected the anode and 3.3v power end of diode 22D1, and the cathode of diode 22D1 connects
One end of connecting resistance 22R2, the other end of resistance 22R2 are separately connected one end of capacitor 22C5, backup battery 22BT1XH414
The pin 22 of anode and chip U22, the other end of capacitor 22C5 are separately connected cathode and the ground connection of backup battery 22BT1XH414
End；One end of the equal 9 connection resistance 22R1 of the pin 8 and pin of chip U22, the one of the other end connection inductance 22L2 of resistance 22R1
End, the other end of inductance 22L2 are separately connected the pin 4 and pin 5 of signal amplifier U23,4 He of pin of signal amplifier U23
Pin 5 is connected to ground terminal by capacitor 22C2；The pin 11 of chip U22 connects the pin 4 of filter FLT2, filter
Pin 2, pin 3 and the connection ground terminal of pin 5 of FLT2, the pin 6 of the 1 connection signal amplifier U23 of pin of filter FLT2,
The pin 1,2 of signal amplifier U23 connects ground terminal, and the pin 3 of signal amplifier U23 passes sequentially through inductance 22L1, capacitor
The pin 4 of 22C1 connection filter FLT1, pin 2, pin 3 and the pin 5 of filter FLT1 connect ground terminal, filter FLT1
Pin 1 connect one end of GPS antenna seat ANT2, the other end of antenna pedestal ANT2 connects ground terminal.
Further, the GPRS interface circuit includes GPRS interface chip U21, the pin 17 of chip U21, pin 18,
Pin 19, pin 39, pin 45, pin 46, pin 53, pin 54, pin 58, pin 59, pin 61, pin 62, pin 63,
Pin 64 and pin 65 are all connected with ground terminal；The collector of the 1 connecting triode 2T1 of pin of chip U21, the hair of triode 2T1
Emitter-base bandgap grading connects ground terminal, and triode 2T1 ground level is connected to master controller MCU by resistance 21R1, and triode 2T1 ground level also passes through
Resistance 21R2 connection ground terminal；The pin 16 of chip U21 passes through capacitor 21C1 connection ground terminal；The pin 26 of chip U21 passes through
Capacitor 21C2 connection ground terminal, chip U21 pin 30, pin 31, pin 32 and pin 33 connect SIM card module；Chip U21's
Pin 52 passes through resistance 21R4, LED light 21LED1 connection ground terminal；Pin 55, pin 56 and the pin 57 of chip U21 passes through magnetic
Pearl 2LR1 connection GSM power end, by resistance 21R6 connection ground terminal, the pin 60 of chip U21 passes through the pin 66 of chip U21
Resistance 21R5 connection GPRS antenna seat ANT1, the GPRS antenna seat ANT1 other end connect ground terminal.
Further, the power circuit include the first power-switching circuit and second source conversion circuit, described first
Electricity conversion source circuit is for generating 3.3V voltage, and the secondary power supply conversion circuit is for generating 5V voltage.
Further, first power-switching circuit includes voltage conversion chip U85,1 He of pin of the chip U85
Pin 3 is all connected with one end of system power supply and capacitor 85C1, and the other end of capacitor 85C1 is separately connected 2 He of pin of chip U85
Ground terminal；The pin 5 of the chip U85 is separately connected one end of capacitor 85C2, one end of capacitor 85C3 and diode 85D1's
The pin 5 of cathode, chip U85 exports 3.3V power supply, the other end of capacitor 85C2, the other end of capacitor 85C3 and diode 85D1
Anode be grounded.
Further, the second source conversion circuit includes voltage conversion chip U82,1 He of pin of the chip U82
Pin 3 is all connected with one end of system power supply and capacitor 82C1, and the other end of capacitor 82C1 is separately connected 2 He of pin of chip U82
Ground terminal；The pin 5 of the chip U82 is separately connected one end of capacitor 82C2, one end of capacitor 82C3 and diode 82D1's
Cathode, the pin 5 of chip U82 export 5V power supply, the other end of capacitor 82C2, the other end of capacitor 82C3 and diode 82D1
Anode is grounded.
The effect provided in summary of the invention is only the effect of embodiment, rather than invents all whole effects, above-mentioned
A technical solution in technical solution have the following advantages that or the utility model has the advantages that
The present invention realizes the acquisition to vehicle traveling information simultaneously by CAN interface circuit mainly from the source of data
And vehicle position information is obtained by GPS positioning, it combines both, remote server is back to by GPRS communication module
Platform, realize to vehicle it is more efficient, more targetedly analyze；Meanwhile either is still available from large-scale fleet
Quotient strengthens them for the intelligent management and monitoring capacity of vehicle.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, for those of ordinary skill in the art
Speech, without creative efforts, is also possible to obtain other drawings based on these drawings.
Fig. 1 is the structural schematic diagram of information terminal of the present invention；
Fig. 2 is the circuit diagram of CAN interface circuit of the present invention；
Fig. 3 is the circuit diagram of TF card interface circuit of the present invention；
Fig. 4 is the circuit diagram of GPS interface circuit of the present invention；
Fig. 5 is the circuit diagram of GPRS interface circuit of the present invention；
Fig. 6 is the circuit diagram of the first power-switching circuit of the present invention；
Fig. 7 is the circuit diagram of second source conversion circuit of the present invention.
Specific embodiment
In order to clarify the technical characteristics of the invention, below by specific embodiment, and its attached drawing is combined, to this hair
It is bright to be described in detail.Following disclosure provides many different embodiments or example is used to realize different knots of the invention
Structure.In order to simplify disclosure of the invention, hereinafter the component of specific examples and setting are described.In addition, the present invention can be with
Repeat reference numerals and/or letter in different examples.This repetition is that for purposes of simplicity and clarity, itself is not indicated
Relationship between various embodiments and/or setting is discussed.It should be noted that illustrated component is not necessarily to scale in the accompanying drawings
It draws.Present invention omits the descriptions to known assemblies and treatment technology and process to avoid the present invention is unnecessarily limiting.
As shown in Figure 1, vehicle information terminal of the invention includes master controller and the CAN interface connecting with master controller electricity
Road, GPS interface circuit, GPRS interface circuit, TF (Trans-flash, mobile storage) card interface circuit and power circuit.Power supply
Circuit is used to power to master controller, CAN interface circuit, GPS interface circuit, GPRS interface circuit and TF card interface circuit.
Master controller uses 32 ARM chip STM32F407VGT6 based on Cortex-M4 kernel as main control
Chip, wherein ARM chip uses uCos-iii operating system.
Master control chip is integrated with the channel two-way CAN, respectively J1939 data/address bus and the vehicle based on UDS agreement
Diagnose CAN bus.CAN transceiver uses TJA1050 chip in the CAN interface circuit in the channel two-way CAN, and equipped with complete
ESD protection and common-mode filter have higher reliability, and have reserved the terminal resistance of 120 Ω, user can on demand into
Row configuration.
As shown in Fig. 2, CAN interface circuit includes transceiver U41, model TJA1050.The pin 1 of transceiver U41 and draw
Foot 4 is connect with master controller respectively, and the pin 2 of transceiver U41 is separately connected one end and the ground terminal of capacitor 41C1, transceiver
The pin 3 of U41 is separately connected the other end of power supply and capacitor 41C1, and it is total that the pin 6 and pin 7 of transceiver U41 is separately connected CAN
The pin 8 of 2 feet and 1 foot of mode filter 41CMF1, transceiver U41 is grounded, and 3 feet of CAN common-mode filter 41CMF1 are CAN-N
4 feet of route, CAN common-mode filter 41CMF1 are CAN-P route, and 3 feet of CAN common-mode filter 41CMF1 are separately connected two-way
One end of breakdown diode D41B and one end of resistance 41R1,4 feet of CAN common-mode filter 41CMF1 are separately connected two-way breakdown
One end of diode D41A and the other end of resistance 41R1, the other end and diac of diac D41A
The other end of D41B is grounded.
Using SDIO (Secure Digital Input and Output, secure digital input and output) interface as TF
Card interface circuit cooperates the FatFsR0.09 file management system of SDIO driver and open source, easily realizes TF
The editting functions such as the read-write of card.Manage the non-overflow formula annular FIFO (First constituted with message queue based on memory simultaneously
Input First Output, First Input First Output) buffer area, it has been reliably achieved the J1939 frame storage of big data quantity.
As shown in figure 3, TF card interface circuit uses SDIO interface J_TF, the SDIO interface J_TF's of STM32 integrated chip
Pin 1, pin 2, pin 3, pin 5, pin 7 and pin 8 are all connected with master controller, and the pin 8 of the SDIO interface J_TF draws
Foot 7, pin 5, pin 3, pin 2, pin 1 are connected to by resistance 5R1C, 5R1D, 5R2A, 5R2B, 5R1A, 5R1D respectively
3.3v power end.
GPS interface circuit uses NEO-6M module, and NEO-6M module carries high-performance passive ceramic antenna and (no longer needs to buy
Expensive active antenna), compatible 3.3V and 5V SCM system.The module is very small and exquisite (25.5mm*31mm), and module passes through
The row's needle and external connection of 4 2.54mm spacing.
As shown in figure 4, GPS interface circuit includes GPS chip U22, the pin 21 and pin 20 of chip U22 passes through electricity respectively
It hinders 22R3 and connects master controller with 22R4；The pin 15 of chip U22 is connected by resistance 22R5 with 22R6 respectively with pin 14 to be connect
Ground terminal；Pin 7, pin 10, pin 12 and the pin 13 of chip U22 connects ground terminal；The pin 24 of chip U22 is separately connected electricity
Hold one end of 22C3, one end of capacitor 22C4 and ground terminal, capacitor 22C3 and connects 3.3v power end with the other end of 22C4；Chip
The pin 23 of U22 is separately connected the anode and 3.3v power end of diode 22D1, and the cathode of diode 22D1 connects resistance 22R2
One end, the other end of resistance 22R2 is separately connected the anode and chip of one end of capacitor 22C5, backup battery 22BT1XH414
The pin 22 of U22, the other end of capacitor 22C5 are separately connected the cathode and ground terminal of backup battery 22BT1XH414；Chip U22
Pin 8 and pin it is equal 9 connection resistance 22R1 one end, resistance 22R1 the other end connection inductance 22L2 one end, inductance
The other end of 22L2 is separately connected the pin 4 and pin 5 of signal amplifier U23, and the pin 4 and pin 5 of signal amplifier U23 is equal
Ground terminal is connected to by capacitor 22C2；The pin 11 of chip U22 connects the pin 4 of filter FLT2, and filter FLT2's draws
Foot 2, pin 3 and pin 5 connect ground terminal, the pin 6 of the 1 connection signal amplifier U23 of pin of filter FLT2, signal amplification
The pin 1,2 of device U23 connects ground terminal, and the pin 3 of signal amplifier U23 passes sequentially through inductance 22L1, capacitor 22C1 connection filter
The pin 4 of wave device FLT1, pin 2, pin 3 and the pin 5 of filter FLT1 connect ground terminal, and the pin 1 of filter FLT1 connects
One end of GPS antenna seat ANT2 is connect, the other end of antenna pedestal ANT2 connects ground terminal.
GPRS interface circuit uses SIM900A chip module, which includes a programmable universal input and output
Interface (GPIO) embeds ICP/IP protocol, and the TCP/IP AT instruction of extension, so that data transmission is very convenient, SIM900A is adopted
It is designed with power conservation techniques, work normally the present invention still can in the case where lithium battery power supply, the most low consumption stream under SLEEP mode
Only 1.0mA, module physical interface are 68 patch pad pins, provide all hardware interfaces of application module.
As shown in figure 5, GPRS interface circuit includes GPRS interface chip U21, pin 17, the pin 18, pin of chip U21
19, pin 39, pin 45, pin 46, pin 53, pin 54, pin 58, pin 59, pin 61, pin 62, pin 63, pin
64 and pin 65 be all connected with ground terminal；The collector of the 1 connecting triode 2T1 of pin of chip U21, the emitter of triode 2T1
Ground terminal is connected, triode 2T1 ground level is connected to master controller MCU by resistance 21R1, and triode 2T1 ground level also passes through resistance
21R2 connection ground terminal；The pin 16 of chip U21 passes through capacitor 21C1 connection ground terminal；The pin 26 of chip U21 passes through capacitor
21C2 connection ground terminal, chip U21 pin 30, pin 31, pin 32 and pin 33 connect SIM card module；The pin of chip U21
52 pass through resistance 21R4, LED light 21LED1 connection ground terminal；Pin 55, pin 56 and the pin 57 of chip U21 passes through magnetic bead
2LR1 connection GSM power end, for the pin 66 of chip U21 by resistance 21R6 connection ground terminal, the pin 60 of chip U21 passes through electricity
21R5 connection GPRS antenna seat ANT1 is hindered, the GPRS antenna seat ANT1 other end connects ground terminal.Wherein sim module is existing skill
Art, the present embodiment do not repeat them here.
Power circuit includes the first power-switching circuit and second source conversion circuit, and the first electricity conversion source circuit is used
In generating 3.3V voltage, the secondary power supply conversion circuit is for generating 5V voltage.3.3V is used for master controller, GPS interface
Circuit and the power supply of TF card interface circuit, 5V are used to power to CAN interface circuit and GPRS interface circuit.
As shown in fig. 6, the first power-switching circuit includes voltage conversion chip U85, the pin 1 of the chip U85 and draw
Foot 3 is all connected with one end of system power supply and capacitor 85C1, and the other end of capacitor 85C1 is separately connected the pin 2 of chip U85 and connects
Ground terminal；The pin 5 of the chip U85 is separately connected the negative of one end of capacitor 85C2, one end of capacitor 85C3 and diode 85D1
Pole, the pin 5 of chip U85 export 3.3V power supply, the other end of capacitor 85C2, the other end of capacitor 85C3 and diode 85D1
Anode is grounded.
As shown in fig. 7, second source conversion circuit includes voltage conversion chip U82, the pin 1 of the chip U82 and draw
Foot 3 is all connected with one end of system power supply and capacitor 82C1, and the other end of capacitor 82C1 is separately connected the pin 2 of chip U82 and connects
Ground terminal；The pin 5 of the chip U82 is separately connected the negative of one end of capacitor 82C2, one end of capacitor 82C3 and diode 82D1
The pin 5 of pole, chip U82 exports 5V power supply, and the other end of capacitor 82C2, the other end of capacitor 82C3 and diode 82D1 are just
Extremely it is grounded.
Vehicle information terminal of the invention is mainly used for large-scale fleet to the management of vehicle or vehicle factor for vehicle
In replication experiment, vehicle information terminal need to be only directly inserted on vehicle diagnostics mouth or diagnosis is inserted by connecting line extraction
On mouth (as shown in Figure 6), using being simple and convenient to operate, while the normal driving of driver will not influence, so that it may realize to vehicle
The acquisition of data and the driving information and geographical location information that vehicle is returned to remote server.It is deposited simultaneously by reading TF card
The J1939 data of storage and vehicle diagnostics CAN message based on UDS, so that it may realize to the offline inspection of vehicle, analyze vehicle
Operating condition；And information received by remote server, it is clear that the running track of vehicle, vehicle can be carried out
Fuel economy and dynamic property analysis etc., realize the monitoring of the intelligent management and bicycle for fleet.
The above is the preferred embodiment of the present invention, for those skilled in the art,
Without departing from the principles of the invention, several improvements and modifications can also be made, these improvements and modifications are also regarded as this hair
Bright protection scope.
Claims (9)
1. a kind of vehicle information terminal, characterized in that including master controller and the CAN interface circuit, the GPS that are connect with master controller
Interface circuit, GPRS interface circuit and TF card interface circuit, the terminal further include power circuit, and the power circuit is for giving
The master controller, CAN interface circuit, GPS interface circuit, GPRS interface circuit and the power supply of TF card interface circuit.
2. a kind of vehicle information terminal according to claim 1, characterized in that the chip model of the master controller is
STM32F103。
3. a kind of vehicle information terminal according to claim 1, characterized in that the CAN interface circuit includes transceiver
The pin 1 and pin 4 of U41, the transceiver U41 are connect with master controller respectively, and the pin 2 of transceiver U41 is separately connected electricity
The one end and ground terminal, the pin 3 of transceiver U41 for holding 41C1 are separately connected the other end of power supply and capacitor 41C1, transceiver U41
Pin 6 and pin 7 be separately connected 2 feet and 1 foot of CAN common-mode filter 41CMF1, the pin 8 of transceiver U41 is grounded, CAN
3 feet of common-mode filter 41CMF1 are CAN-N route, and 4 feet of CAN common-mode filter 41CMF1 are CAN-P route, CAN common mode
3 feet of filter 41CMF1 are separately connected one end of diac D41B and one end of resistance 41R1, CAN common mode filtering
4 feet of device 41CMF1 are separately connected one end of diac D41A and the other end of resistance 41R1, two-way two pole of breakdown
The other end of pipe D41A and the other end of diac D41B are grounded.
4. a kind of vehicle information terminal according to claim 1, characterized in that the TF card interface circuit uses STM32
The SDIO interface J_TF of integrated chip, pin 1, pin 2, pin 3, pin 5, pin 7 and the pin 8 of the SDIO interface J_TF
It is all connected with master controller, pin 8, pin 7, pin 5, pin 3, pin 2, the pin 1 of the SDIO interface J_TF passes through respectively
Resistance 5R1C, 5R1D, 5R2A, 5R2B, 5R1A, 5R1D are connected to 3.3v power end.
5. a kind of vehicle information terminal according to claim 1, characterized in that the GPS interface circuit includes GPS chip
The pin 21 of U22, the chip U22 connect master controller with 22R4 by resistance 22R3 respectively with pin 20；Chip U22's draws
Foot 15 connects ground terminal with 22R6 by resistance 22R5 respectively with pin 14；The pin 7 of chip U22, pin 10, pin 12 and draw
Foot 13 connects ground terminal；The pin 24 of chip U22 is separately connected one end of capacitor 22C3, one end of capacitor 22C4 and ground terminal,
Capacitor 22C3 connects 3.3v power end with the other end of 22C4；The pin 23 of chip U22 is separately connected the anode of diode 22D1
With 3.3v power end, one end of the cathode connection resistance 22R2 of diode 22D1, the other end of resistance 22R2 is separately connected capacitor
One end of 22C5, the anode of backup battery 22BT1XH414 and chip U22 pin 22, the other end of capacitor 22C5 is separately connected
The cathode and ground terminal of backup battery 22BT1XH414；One end of the equal 9 connection resistance 22R1 of the pin 8 and pin of chip U22, electricity
One end of the other end connection inductance 22L2 of 22R1 is hindered, the other end of inductance 22L2 is separately connected the pin 4 of signal amplifier U23
With pin 5, the pin 4 and pin 5 of signal amplifier U23 is connected to ground terminal by capacitor 22C2；The pin 11 of chip U22
The pin 4 of filter FLT2 is connected, pin 2, pin 3 and the pin 5 of filter FLT2 connects ground terminal, and filter FLT2's draws
The pin 1,2 of the pin 6 of 1 connection signal amplifier U23 of foot, signal amplifier U23 connects ground terminal, signal amplifier U23's
Pin 3 passes sequentially through the pin 4 of inductance 22L1, capacitor 22C1 connection filter FLT1, pin 2,3 and of pin of filter FLT1
Pin 5 connects ground terminal, and the pin 1 of filter FLT1 connects one end of GPS antenna seat ANT2, and the other end of antenna pedestal ANT2 connects
Connect ground terminal.
6. a kind of vehicle information terminal according to claim 1, characterized in that the GPRS interface circuit includes that GPRS connects
Mouth chip U21, the pin 17 of chip U21, pin 19, pin 39, pin 45, pin 46, pin 53, pin 54, draw pin 18
Foot 58, pin 59, pin 61, pin 62, pin 63, pin 64 and pin 65 are all connected with ground terminal；The pin 1 of chip U21 connects
The collector of triode 2T1 is connect, the emitter of triode 2T1 connects ground terminal, and triode 2T1 ground level is connected by resistance 21R1
To master controller MCU, triode 2T1 ground level also passes through resistance 21R2 connection ground terminal；The pin 16 of chip U21 passes through capacitor
21C1 connection ground terminal；The pin 26 of chip U21 pin 31, is drawn by capacitor 21C2 connection ground terminal, chip U21 pin 30
Foot 32 and pin 33 connect SIM card module；The pin 52 of chip U21 passes through resistance 21R4, LED light 21LED1 connection ground terminal；
The pin 55 of chip U21, pin 56 connect GSM power end by magnetic bead 2LR1 with pin 57, and the pin 66 of chip U21 passes through electricity
21R6 connection ground terminal is hindered, the pin 60 of chip U21 passes through resistance 21R5 connection GPRS antenna seat ANT1, GPRS antenna seat ANT1
The other end connects ground terminal.
7. a kind of vehicle information terminal according to claim 1, characterized in that the power circuit turns including the first power supply
Circuit and second source conversion circuit are changed, the first electricity conversion source circuit turns for generating 3.3V voltage, the secondary power supply
Circuit is changed for generating 5V voltage.
8. a kind of vehicle information terminal according to claim 7, characterized in that first power-switching circuit includes electricity
Conversion chip U85 is pressed, the pin 1 and pin 3 of the chip U85 are all connected with one end of system power supply and capacitor 85C1, capacitor
The other end of 85C1 is separately connected the pin 2 and ground terminal of chip U85；The pin 5 of the chip U85 is separately connected capacitor 85C2
One end, one end of capacitor 85C3 and the cathode of diode 85D1, the pin 5 of chip U85 exports 3.3V power supply, capacitor 85C2's
The anode of the other end, the other end of capacitor 85C3 and diode 85D1 is grounded.
9. a kind of vehicle information terminal according to claim 7, characterized in that the second source conversion circuit includes electricity
Conversion chip U82 is pressed, the pin 1 and pin 3 of the chip U82 are all connected with one end of system power supply and capacitor 82C1, capacitor
The other end of 82C1 is separately connected the pin 2 and ground terminal of chip U82；The pin 5 of the chip U82 is separately connected capacitor 82C2
One end, one end of capacitor 82C3 and the cathode of diode 82D1, the pin 5 of chip U82 exports 5V power supply, and capacitor 82C2's is another
The anode of one end, the other end of capacitor 82C3 and diode 82D1 is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811619713.0A CN109448159A (en) | 2018-12-28 | 2018-12-28 | A kind of vehicle information terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811619713.0A CN109448159A (en) | 2018-12-28 | 2018-12-28 | A kind of vehicle information terminal |
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| CN109448159A true CN109448159A (en) | 2019-03-08 |
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|---|---|---|---|
| CN201811619713.0A Pending CN109448159A (en) | 2018-12-28 | 2018-12-28 | A kind of vehicle information terminal |
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102355644A (en) * | 2011-10-17 | 2012-02-15 | 张光前 | Method based on short message remote control power converter and device |
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