CN209803787U - Vehicle-mounted information acquisition system - Google Patents
Vehicle-mounted information acquisition system Download PDFInfo
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- CN209803787U CN209803787U CN201921079479.7U CN201921079479U CN209803787U CN 209803787 U CN209803787 U CN 209803787U CN 201921079479 U CN201921079479 U CN 201921079479U CN 209803787 U CN209803787 U CN 209803787U
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Abstract
The utility model provides an on-vehicle information acquisition system, including on-vehicle information acquisition host system, power module 1, power module 2, bus data acquisition module, analog input collection module, isolation module, communication module, data storage module, self-checking alarm module, the detection module that soaks and orientation module, on-vehicle information acquisition host system is connected to respectively self-checking alarm module with the detection module that soaks, power module 2 bus data acquisition module analog input collection module communication module with the data storage module via the isolation module with on-vehicle information acquisition host system connects, orientation module by power module 1 supplies power. The information acquisition system can position and detect the system state, can store the running state of the vehicle in an off-line mode, and is high in data reliability.
Description
Technical Field
The utility model relates to a vehicle information gathers the field, especially relates to an on-vehicle information acquisition system.
Background
The vehicle information acquisition refers to the monitoring of important vehicles such as automobiles, armored vehicles, field operation vehicles and the like by using electrical appliances, electrons, components, machinery and other instruments. The monitoring contents are various, and the common monitoring contents include the running condition of the vehicle, the position of the vehicle and the like.
The traditional vehicle-mounted information acquisition system sampling positioner and the system share a power supply, and if system faults occur frequently in the use process, the power supply of the positioner fails, the vehicle-mounted information acquisition fails, and the remote positioning cannot be realized. In addition, the data information of the traditional vehicle-mounted information acquisition system is often inaccurate in measurement due to the interference of external signals in the processing process, and the practicability of the acquisition system is seriously reduced.
SUMMERY OF THE UTILITY MODEL
In order to solve the shortcomings of the prior art, the utility model aims to provide a vehicle-mounted information acquisition system to guarantee that vehicle information acquisition's is complete and reliable.
The utility model provides a vehicle-mounted information acquisition system, including vehicle-mounted information acquisition host system, power module 1, power module 2, bus data acquisition module, analog input acquisition module, isolation module, communication module, data storage module, self-checking alarm module, the detection module that soaks and orientation module, vehicle-mounted information acquisition host system is connected to respectively self-checking alarm module with the detection module that soaks, power module 2 bus data acquisition module analog input acquisition module communication module with data storage module via the isolation module with vehicle-mounted information acquisition host system connects orientation module by power module 1 supplies power.
Preferably, the data storage module and the vehicle-mounted information acquisition main control module adopt SPI communication, communication adopts isolation by the isolation module, and the isolation mode is DC-DC isolation.
Preferably, the power module 1 is used for independently supplying power to the positioning module, and when the power supply of the vehicle-mounted information acquisition main control module is powered off, the power module 1 can still supply power to the positioning module.
Preferably, the bus data acquisition module adopts a FlexRay bus and a CAN bus.
preferably, the self-checking alarm module completes the self-checking function by reading, writing and monitoring the bus data acquisition module, the analog input acquisition module and the data storage module by the vehicle-mounted information acquisition main control module.
Preferably, an LED lamp is arranged outside the self-checking alarm module, and the self-checking alarm module comprises a normal operation state and a fault operation state; when the normal state finishes the self-checking function, the LED lamp does not flicker, when the fault state, the self-checking cannot be finished, the alarm function is finished by the flickering of the LED lamp, and the interval time of the flickering of the LED lamp represents the fault type.
Preferably, the vehicle-mounted information acquisition system processes information in an interrupt mode, wherein the interrupt mode comprises receiving interrupt and sending.
preferably, when the vehicle-mounted information acquisition main control module detects that the receiving is interrupted, the data of the buffer is received, fault diagnosis is performed on the data, and the data is stored in the memory space of the vehicle-mounted information acquisition main control module.
Preferably, when the vehicle-mounted information acquisition main control module detects that transmission is interrupted, the vehicle-mounted information acquisition main control module reads data from the memory space, decompresses and decrypts the data, and stores the data in the transmission buffer to finish transmission of the data.
compared with the prior art, the beneficial effects of the utility model are embodied in:
(1) the utility model discloses a data decryption and compression method lead to the problem that the information of storing spilled over after the long-term operation of having avoided, have promoted the information storage time of off-line monitoring.
(2) the utility model discloses an independent power supply orientation module can guarantee that the system normally fixes a position after breaking down.
(3) The utility model discloses a full isolated design, all modules have been kept apart with host system's being connected, have guaranteed data transmission's reliability, have improved the interference killing feature of system.
Drawings
FIG. 1 is a structural diagram of the vehicular information acquisition system of the present invention;
Fig. 2 is a block diagram of the power module of the present invention;
FIG. 3 is a schematic circuit diagram of one FlexRay bus communication channel;
FIG. 4 is a schematic block diagram of analog acquisition by the analog input acquisition module;
Fig. 5 is a circuit diagram of the signal generating circuit of the positioning module of the present invention;
Fig. 6 is a block diagram of the data storage module of the present invention.
Detailed Description
In order to further understand the structure, characteristics and other objects of the present invention, the following detailed description is given with reference to the accompanying preferred embodiments, which are only used to illustrate the technical solution of the present invention and are not intended to limit the present invention.
Fig. 1 is the structure diagram of the vehicle-mounted information acquisition system of the utility model. The intelligent vehicle-mounted intelligent water immersion monitoring system comprises a vehicle-mounted information acquisition main control module, a power supply module 1, a power supply module 2, a bus data acquisition module, an analog input acquisition module, an isolation module, a communication module, a data storage module, a self-checking alarm module, a water immersion detection module and a positioning module.
The vehicle-mounted information acquisition main control module adopts a Cortex _ M3 microprocessor which is a 32-bit processor, the instruction is a V7 instruction, the operation speed is greatly improved compared with that of ARM7 and is 3 times that of ARM7, the power consumption is three quarters lower than that of ARM7, the size is smaller, the vehicle-mounted information acquisition main control module can be integrated with other functions, the whole system design is considered to at least need 3 SPI buses, 1 USB, an IIC and multiple IO, and peripheral resources are ensured during design and model selection.
The power module 2 is supplied with power by input voltage, and the power module 2 is supplied with power by a lithium battery.
The FlexRay communication network in the bus data acquisition module adopts a time division multiplexing data transmission mode, and an access control mechanism of the FlexRay communication network is based on a cycle communication period. A CAN protocol controller in the bus data acquisition module adopts a PCA82C250 physical bus interface.
The analog input end of the analog input acquisition module adopts a TVS diode for clamping protection, so that the conditioning circuit is prevented from being damaged by overvoltage. The digital isolator is adopted to isolate the analog part from the digital part, the whole system cannot be damaged even if the analog part is damaged due to overvoltage, the digital isolator adopts ADuM240X series, the data transmission rate is 150MHz, 8000V peak surge voltage can be isolated, and the safety and reliability of the system are ensured.
The data storage module and the main controller adopt SPI communication, the communication isolator is isolated, the power supply also adopts DC-DC isolation, and the isolation of the signal acquisition module and the data storage module is effectively realized.
The working principle of the self-checking alarm module is as follows: when normally accomplishing the self-checking function, the LED lamp does not flicker, when certain function breaks down and can't accomplish the self-checking, can accomplish alarming function through the LED lamp scintillation. The interval for setting the LED flashing defines the type of fault, for example: the method comprises the following steps of FlexRay bus fault setting LED flickering once every 1S, CAN bus fault setting LED flickering once every 2S, data storage function fault setting LED flickering once every 3S and the like.
Fig. 2 is a block diagram of the power module structure of the present invention. The power module of the vehicle-mounted information acquisition equipment is divided into two parts, wherein one part is supplied by input voltage, and the other part is supplied by lithium batteries. The input voltage power supply enters a DC-DC module after input protection and electromagnetic compatibility design, 5V voltage VCC5 is generated, and the power supply is used for supplying power for the bus data acquisition module, the self-checking alarm module and the like; VCC5 generates 3.3V voltage VCC3.3 through a linear voltage stabilizer, and supplies power for the vehicle-mounted information acquisition main control module, the communication module and the like; VCC5 generates +/-15V voltage through a DC-DC module to supply power to the power supply part of the analog input acquisition module, and the +15V voltage generates 5V voltage VDD5 through a linear voltage stabilizer to supply power to the water immersion detection module, the isolation module and the like; VCC5 generates VDD5_0, VDD5_1, VDD5_2 and VDD5_3 through a DC-DC module to supply power for the analog input acquisition module; VCC5 generates a 3.3V voltage VDD3.3 via the DC-DC module to power the data storage module.
One part is supplied with power by a 3.6V lithium battery, and the 3.6V lithium battery generates 3.3V voltage V3.3 through a low dropout regulator (LDO) to supply power for the positioning system.
the main power supply module adopts a DC-DC power supply module, the module has the advantages of low ripple noise, short circuit protection (self-recovery), high isolation voltage (1500V) and the like, and different power supply modules are mutually independent, so that the safety and the reliability of the system are improved. When drawing the PCB, different modules are put together according to the power supply module, and the power supply layer and the stratum are divided according to the modules.
Fig. 3 is a schematic circuit diagram of one FlexRay bus communication channel. In the figure, a bus transceiver A of a bus communication channel A adopts TJA1080A of NXP, a common mode choke coil adopts ACM3225-102-2P of TDK or a choke coil with the same performance index, and the length, the width and the height of the choke coil are respectively not more than 10.0mm, 6.0mm and 5.2 mm; the isolator must transmit at a rate greater than 10 MHz. For better EMC performance, in the design of the node equipment interface circuit, the equivalent bypass capacitance Cbp of the ESD protection circuit is Cbm < 20pF, and the deviation is less than 2%. The bus terminal interface adopts a separation terminal and a resistor RTA＝RTB1.5K Ω, and RTA、RTBA resistance tolerance of 1% resistor is used, and the capacitance C1 is 4.7 nF.
The FlexRay bus divides a communication cycle into a plurality of time slots, and data transmission and reception of each bus node must be completed in each time slot which is allocated in advance. The FlexRay bus should have at least two independent communication channels, independent bus power supplies, isolated bus ground from chassis ground, and minimize interference radiation for transient, electrostatic discharge (ESD) and electromagnetic interference (EMI) immunity to meet electromagnetic compatibility requirements.
Fig. 4 is a schematic block diagram of analog acquisition by the analog input acquisition module. The analog input acquisition module is designed to have a voltage input range of +/-10V, a frequency acquisition range of 0-1 MHz and an input impedance of more than 10G omega so as to ensure the universality of the analog acquisition module.
The analog input end adopts a TVS diode for clamping protection to prevent the conditioning circuit from being damaged by overvoltage. The digital isolator is adopted to isolate the analog part from the digital part, the whole system cannot be damaged even if the analog part is damaged due to overvoltage, the digital isolator adopts ADuM240X series, the data transmission rate is 150MHz, 8000V peak surge voltage can be isolated, and the safety and reliability of the system are ensured.
The signal conditioning circuit conditions the input +/-10V voltage to 0-5V to meet the amplitude range of an ADC input signal, a 16-bit analog-to-digital converter is adopted to improve the sampling precision, the reference voltage of the analog-to-digital converter is 5V, and the 0.3mV resolution can be guaranteed. The analog-to-digital converter adopts AD7980 of ADI, successive approximation ADC, 16-bit resolution, 1MSPS sampling speed and 0.6LSB integral nonlinearity, and has good linearity.
Fig. 5 is a circuit diagram of the signal generating circuit of the positioning module of the present invention. Under the condition that the power supply normally works, the function of the periodic square wave signal is mainly realized by a monostable multivibrator integrated chip CD4047 and external resistors R5 and R6 thereof, a diode D2 and a capacitor C5. When the SIN is in a high level, the pin 7 of U2 is in a high level, U2 has no voltage output, U1 stops working, when the SIN is in a high level, Q1 and Q2 are conducted, the pin 7 of U2 is pulled down to a low level, U2 works, voltage output exists, U1 can normally work and outputs a square wave signal, a D3 diode plays a role in amplitude limiting, the amplitude of an output square wave pulse is controlled, and overshoot generated in the moment of outputting the square wave is prevented. The design can reduce power consumption, prolong the working time of the battery and prolong the working time of the positioning system.
Fig. 6 is a block diagram of the data storage module of the present invention. The data storage chip adopts NAND FLASH, NAND FLASH to be widely used due to its characteristics of fast read/write speed, large storage density, erasability, non-volatility, and convenient command, address, data line multiplexing and interface. The data storage module adopts 4 pieces of K9F8G08 as a data storage medium, wherein K9F8G08 adopts T-type topology, IO ports are saved, an SPI (serial peripheral interface) is used for data interaction with a main controller, data can be read through a USB according to a protocol interface but data can not be written, and if a data reading protocol is incorrect, the data storage module can erase data of a data storage chip, so that information safety is effectively guaranteed.
It should be noted that the above mentioned contents and embodiments are intended to demonstrate the practical application of the technical solution provided by the present invention, and should not be interpreted as limiting the scope of the present invention. Various modifications, equivalent substitutions and improvements will occur to those skilled in the art and are intended to be within the spirit and scope of the present invention. The protection scope of the present invention is subject to the appended claims.
Claims (9)
1. The utility model provides a vehicle-mounted information acquisition system, its characterized in that, includes vehicle-mounted information acquisition host system, power module 1, power module 2, bus data acquisition module, analog input acquisition module, isolation module, communication module, data storage module, self-checking alarm module, detection module and orientation module soak, vehicle-mounted information acquisition host system is connected to respectively self-checking alarm module with the detection module soaks, power module 2 bus data acquisition module analog input acquisition module communication module with data storage module via isolation module with vehicle-mounted information acquisition host system connects, orientation module by power module 1 supplies power.
2. The vehicle-mounted information acquisition system according to claim 1, wherein the data storage module and the vehicle-mounted information acquisition main control module adopt SPI communication, the communication adopts isolation by the isolation module, and the isolation mode is DC-DC isolation.
3. The vehicle-mounted information acquisition system according to claim 1, wherein the positioning module is independently powered by the power module 1, and when the power supply of the vehicle-mounted information acquisition main control module is powered off, the power module 1 can still supply power to the positioning module.
4. The vehicle-mounted information acquisition system according to claim 1, wherein the bus data acquisition module adopts a FlexRay bus and a CAN bus.
5. The vehicle-mounted information acquisition system according to claim 1, wherein the self-checking alarm module completes the self-checking function by reading, writing and monitoring the bus data acquisition module, the analog input acquisition module and the data storage module by the vehicle-mounted information acquisition main control module.
6. The vehicle-mounted information acquisition system according to claim 1, wherein an LED lamp is arranged outside the self-checking alarm module, and the LED lamp comprises a normal operation state and a fault operation state; when the normal state finishes the self-checking function, the LED lamp does not flicker, when the fault state, the self-checking cannot be finished, the alarm function is finished by the flickering of the LED lamp, and the interval time of the flickering of the LED lamp represents the fault type.
7. The system of claim 1, wherein the system processes the information in an interrupt manner, the interrupt manner comprising receiving an interrupt and transmitting.
8. The vehicle-mounted information acquisition system according to claim 1, wherein when the vehicle-mounted information acquisition main control module detects that the reception is interrupted, the data of the buffer is received, fault diagnosis is performed on the data, and the data is stored in a memory space of the vehicle-mounted information acquisition main control module.
9. The vehicle-mounted information collection system according to claim 1, wherein when the vehicle-mounted information collection main control module detects that the transmission is interrupted, the vehicle-mounted information collection main control module reads data from the memory space, decompresses and decrypts the data, stores the data in the transmission buffer, and completes the transmission of the data.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921079479.7U CN209803787U (en) | 2019-07-10 | 2019-07-10 | Vehicle-mounted information acquisition system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921079479.7U CN209803787U (en) | 2019-07-10 | 2019-07-10 | Vehicle-mounted information acquisition system |
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| Publication Number | Publication Date |
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| CN209803787U true CN209803787U (en) | 2019-12-17 |
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| CN201921079479.7U Active CN209803787U (en) | 2019-07-10 | 2019-07-10 | Vehicle-mounted information acquisition system |
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- 2019-07-10 CN CN201921079479.7U patent/CN209803787U/en active Active
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