CN109782650A - A kind of mounted remote monitor terminal based on multiple sensors - Google Patents
A kind of mounted remote monitor terminal based on multiple sensors Download PDFInfo
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Abstract
A kind of mounted remote monitor terminal based on multiple sensors is claimed in the present invention, comprising: power management module；GPRS module；GPS module；SD card module；Analog signal processing module；Digital signal processing module；Communication module；Hardware watchdog module；Micro controller module；Vehicle-mounted real-time data acquisition and monitoring may be implemented in the terminal, thus NO in the operating condition of real-time monitoring diesel vehicle actual motion and tail gasXConcentration and particle concentration are horizontal.It can be to NO in diesel vehicle actual motion by the terminalXThe information such as pressure difference carry out real-time monitoring and data acquisition before and after concentration, particle concentration level, SCR working efficiency, DPF.By the invention, the discharge of the pollutant of diesel vehicle is more efficiently supervised, also implements the location information of observation vehicle by GPS positioning, the monitoring and skill upgrading to automobile, field of traffic have positive facilitation.
Description
Technical field
The present invention is a kind of mounted remote monitor terminal based on multiple sensors, specifically, belongs to diesel vehicle remotely eventually
The development technique at end.
Background technique
As the development of urban transportation and the ownership of motor vehicle are significantly increased, vehicular emission has become environmental pollution
Main source.Automobile is the significant contributor of automobile pollution total emission volumn, and nitrogen oxide NOx and particulate matter PM are more than 90%.
By fuel grade, 70% or so, PM of NOx close to the vehicle mass exhaust total quantity of national emission of diesel engine is more than 90%.And NOx and PM
There is great harm to environment and human body.NOx can form nitrous acid and nitric acid after entering alveolar, generate acutely to lung tissue
Stimulation.NOx and HC is chemically reacted after being irradiated by sunlight middle-ultraviolet lamp, forms toxic photochemical fog.When photochemical
When learning the photochemical oxidant in smog more than a certain concentration, there is apparent irritation to human body.Photochemical fog also has
It damages plant, reduce the harm such as atmospheric visibility, damage rubber product.Soot is not only harmful to the respiratory system of people in itself, and
And sulfur dioxide is often adsorbed in the hole of soot grain and there are the substances such as the polycyclic aromatic hydrocarbons (PAH) of carcinogenesis.It can be seen that machine
Motor-car exhaust emissions has threatened the health of the mankind, and it is extremely urgent to improve environment for human survival.
In atmosphere Prevention Plans in 2017, environmentally friendly administrative department proposes to strengthen and supervise to the environmental protection of commerial vehicle, product
Pole promotes diesel vehicle to install the vehicle mounted remote communicating terminal (OBD+GPRS) for having real-time diagnosis function additional；For state four at this stage,
State's five vehicles malice, which distorts OBD, diesel vehicle releases to limit turn round function, do not add urea for vehicle etc. causes emission control systems to fail
Malice illegal activities.And in state's sixfold type emission regulation and relevant laws and regulations are formulated, also particularly embody in terms of these
Pay attention to, in addition to the test of PEMS real road becomes basic demand, it is contemplated that objectively emission control systems failure is not easy really
It is noticeable, especially increases the requirement of vehicle remote discharge management, to find, safeguard in time to reduce the super discharge capacity of discharge.Cause
This, needs a kind of mounted remote emission monitoring terminal for capableing of the emissions datas such as real-time monitoring PM, NOx.
The emphases of supervision of automobile pollution emission control turns to actual motion supervision substantially, is gradually forming full-time
Empty, a variety of united vehicular emissions of measuring technology monitor network in real time.Thus, the full-time empty lower diesel vehicle PM of reply government with
NOXEmission compliance supervision, understands diesel vehicle actual motion PM and NOXEmission behaviour, and for may occur risk of exceeding criterion PM and
NOXMaximum discharge bad working environments carry out real-time monitoring, are directed to PM and NO to reachXMaximum discharge bad working environments region carries out control strategy
The purpose of optimization, is particularly important enterprise.The monitoring technology of new technology OBD is shown one's talent, and motor vehicle is being increasingly becoming
The powerful measure of emission monitoring and supervision, OBD system can carry out the exhaust system of vehicle in the Life cycle of vehicle
Monitoring can discharge the case where severely exceeding to avoid vehicle and occur.
However it is more existing
Summary of the invention
The invention proposes a kind of mounted remote emission monitoring terminals for being integrated with multiple sensors, are existed using car-mounted terminal
Line monitoring system monitors the operating condition of diesel vehicle actual motion, discharge parameter, environmental parameter etc., dynamic monitoring diesel vehicle actual motion
Operating condition and emission information, comprehensive real-time dynamic monitoring is carried out to the emissions data of vehicle, is that environmental protection administration and manufacturing enterprise are real
When monitoring vehicle operating condition and discharge provide equipment and technology support.
A kind of mounted remote monitor terminal based on multiple sensors is claimed in the present invention characterized by comprising
Power management module；GPRS module；GPS module；SD card module；Analog signal processing module；Digital Signal Processing
Module；Communication module；Hardware watchdog module；Micro controller module；
Wherein, power management module: for other module for power supply；
GPRS module: wireless data transmission communication；
GPS module: satellite positioning；
SD card module: it controls wide lambda sensor and works normally, export air-fuel ratio, sensor temperature signals；
Analog signal processing module: handling analog signal, filtering, A/D conversion and Circuit fault diagnosis；
Digital signal processing module: handling digital signal, identification signal frequency or duty ratio；
Communication module: 1 tunnel CAN communication；
Hardware watchdog module: independently of the hardware watchdog except microcontroller, security monitoring is realized；
Micro controller module: logical operation and storage are realized.
The present invention is mentioned for the demand of a variety of acquisition parameter remote monitor devices such as diesel vehicle actual operating mode and discharge
A kind of mounted remote monitor terminal for being integrated with multiple sensors is gone out.The present invention is based on car-mounted terminal online monitoring systems can
Real-time monitoring diesel vehicle operating condition, PM, NOXThe parameters such as parameter, delivery temperature, ambient humidity, DPF pressure difference are discharged, thus real
The monitoring of existing real-time monitoring diesel vehicle actual operating mode, pollutant and environmental information.
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, the accompanying drawings in the following description is only this
Some embodiments of invention without any creative labor, may be used also for those of ordinary skill in the art
To obtain other drawings based on these drawings.
Attached drawing 1 is a kind of modular structure of the mounted remote monitor terminal based on multiple sensors according to the present invention
Figure；
Attached drawing 2a-2c is a kind of mounted remote monitor terminal power module based on multiple sensors according to the present invention
Manage schematic diagram；
Attached drawing 3 is a kind of knot of the mounted remote monitor terminal GPRS module based on multiple sensors according to the present invention
Composition；
Attached drawing 4 is a kind of mounted remote monitor terminal GPRS module based on multiple sensors according to the present invention
PWRKEY pin opening module circuit diagram；
Attached drawing 5 is a kind of mounted remote monitor terminal GPRS module serial ports based on multiple sensors according to the present invention
Communication scheme；
Attached drawing 6 is a kind of mounted remote monitor terminal GPRS module SIM based on multiple sensors according to the present invention
Deck interface circuit figure；
Attached drawing 7 is that a kind of mounted remote monitor terminal separate hardware based on multiple sensors according to the present invention is guarded the gate
The watchdog reset schematic diagram of dog.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
It is a kind of module knot of the mounted remote monitor terminal based on multiple sensors according to the present invention referring to attached drawing 1
Composition.
Mounted remote emission monitoring terminal of the present invention includes at least upper functional module as shown in the figure, and functional module is clear
Single and simple functions are described as follows:
A, power management module: for other module for power supply；
B, GPRS module: wireless data transmission communication；
C, GPS module: satellite positioning；
D, it SD card module: controls wide lambda sensor and works normally, export air-fuel ratio, sensor temperature signals；
E, analog signal processing module: handling analog signal, filtering, A/D conversion and Circuit fault diagnosis；
F, digital signal processing module: handling digital signal, identification signal frequency or duty ratio.This patent relates to
And to sensor have: nitrogen oxide sensor, PM sensor, exhaust gas temperature sensor, DPF differential pressure pickup, atmospheric temperature/humidity
Sensor；
G, communication module: 1 tunnel CAN communication communicates between automobile transmission data and car-mounted terminal, and transmission data mainly include
Engine ECU information and OBD failure stream information；
H, hardware watchdog module: independently of the hardware watchdog except microcontroller, security monitoring is realized；
I, logical operation and storage micro controller module: are realized；
Further, mounted remote emission monitoring terminal of the present invention is according to J1939 agreement, at digital signal
Reason module acquires in real time and parses main vehicle operation data, such as speed, engine speed, engine load, engine wink
When oil consumption, accelerator pedal aperture, atmospheric pressure, intake air temperature, admission pressure, engine water temperature, exhaust system temperature etc., and root
According to diagnosing protocol, the fault message of vehicle and engine system is acquired and parsed in real time by analog signal processing module.Then,
By these information after digital signal processing module and analog signal processing resume module, microcontroller, micro-control are passed to
The reset of system and peripheral hardware is controlled by hardware watchdog module.Microcontroller is responsible for executing the work of process control whole system
Process, the SD card module based on semiconductor fast-flash memory device store corresponding information.Car-mounted terminal is acquired by CAN bus module
The operation data and the relevant parameter of post-processing of vehicle, by GPS module acquisition time and the location information parameter of vehicle, so
The data of car-mounted terminal acquisition are sent to remote server by GPRS module in real time afterwards.
The power supply of each module is mainly completed by power management module.Power management module is divided into three parts: 1), 24V store
Battery input, 24V turn 5V output module, power for system 5V logic power, power to minimum system monolithic, give CAN bus mould
Block power supply and the matching power supply of serial data bus signal logic level；2), 5V turns 3.3V output, powers for GPS module, with
And SD card module for power supply；3), 24V turns 4.2V module, powers to GPRS module.
It is a kind of mounted remote monitor terminal power supply based on multiple sensors according to the present invention referring to attached drawing 2a-2c
Module management schematic diagram；
Power management is divided into three parts: 1) 24V turns 5V output, system power supply；2) 5V turns 3.3V, GPS module power supply and
SD card module, 3) 24V turns 4.2V output, GPRS module power supply；
1,24V turns 5V output, and circuit diagram is as shown below, and when 24V power input, the indicator light is always on, defeated without 5V power supply
Out, only when ignition switch is closed, power management chip has the output of 5V power supply.Attached drawing 2a is that 24V turns 5V circuit diagram.
2,5V turns 3.3V output, and as shown in attached drawing 2b, 5V input is fixed to export 3.3V, altogether GPS module power supply and SD card mould
Block.
3, turn 4.2V output referring to attached drawing 2c, 24V, be only used in minimum system operation, just can control the output of 4.2V power supply.Cause
It is larger to output and input pressure difference, using switching regulator, especially in the case where when module happens suddenly, electric current reaches 2A, open
It is with the obvious advantage to close voltage regulator efficiency.
Attached drawing 3 is a kind of knot of the mounted remote monitor terminal GPRS module based on multiple sensors according to the present invention
Composition；
For the voltage input of GPRS from 3.2V to 4.8V, voltage used at present is 4.2V.
It uses PWRKEY pin opening module (booting), MCU by drag down PWRKEY signal at least 1 second then discharge come
Booting, this pin are pulled upward to 3V, circuit attached drawing 4 in module.
It is serial ports that MCU is communicated with GPRS module, TXD: is sent data on the RXD signal wire of DTE equipment.RXD: from DTE
Data are received on the TXD signal wire of equipment, referring to shown in attached drawing 5.
SIM card pin definitions are as follows: in SIM card interface
Table 1SIM card pin definitions
| Pin name | Function |
| SIM_VDD | SIM power supply |
| SIM_DATA | SIM card data I/O |
| SIM_CLK | SIM card clock |
| SIM_RST | SIM card resets |
| SIM_PRESENCE | SIM card plug detection |
The SIM card holder interface circuit of 6 pins is as shown in Fig. 6.
Network state indicator light is the indicator light that NETLIGHT signal is used to drive network state, passes through network state lamp
Flashing may determine that current network state.
Antennal interface then refers to that antenna should use microstrip line or the other kinds of radio frequency that can control 50 Ω of impedance to walk
The antenna of line and module.
Further, GPS module supply district: 3.0V to 3.6V.
MCU and SD card use SPI communication, the power supply 3.3V of SD card.SD card is broadly divided into four parts and forms: external pin,
Internal register, interface controller and internal storage medium.The main pin of SD card and function are described as follows:
CLK: clock signal, controller or SD card transmit a command bit or data bit in each clock cycle, in SD
The default speed mode lower frequency of bus can change between 0~25MHz, and the bus manager of SD card can be unrestricted
The frequency for freely generating 0~25MHz, under UHS-I velocity mode, clock frequency reaches as high as 208M.
CMD: order and response multiplexing pins, order is to issue SD card by controller, be can be from controller to single SD
Card, is also possible to all cards in SD bus；Response is the command response that storage card sends controller, and response can come from list
Card or all cards.
DAT0~3: data line, data can be transmitted to controller from card or be transmitted to card from controller.
Further, the integrated sensor of the mounted remote emission monitoring terminal belonging to the present invention includes at least following several
Sensor, sensor inventory and simple functions are described as follows:
A, atmospheric temperature/humidity sensor: by atmospheric humidity and temperature transition at corresponding 0~5V voltage signal.
B, the nitrous oxides concentration in tail gas nitrogen oxide sensor: is converted to CAN signal.
C, PM sensor: being converted to the relevant sensor regeneration period for the concentration of PM in tail gas, and is converted into CAN letter
Number.
D, the variation of temperature exhaust gas temperature sensor: is converted into the variation of corresponding resistance.
E, the variation of pressure differential pressure pickup: is converted into the variation of corresponding voltage.
There are three operating modes for the total module of CAN line: Normal Mode, Receive-only Mode and Stand-by
Mode.Normal mode is selected when INH=L, RM=H, that is, is worked normally；Stand-by is selected when INH=H, RM=H
Data can only be received by CAN bus under this mode of Receive-only Mod by, which selecting when mode, INH=L, RM=L, to send out
Data are sent, the CAN controller that can prevent failure impacts the communication of entire CAN network.
The watchdog reset principle of separate hardware house dog is as shown in Fig. 7, and power management chip integrated system resets control
System controls the reset of MCU and peripheral hardware, the too low reset of upper and lower reset, battery voltage, logic supply voltage is achieved
Too low reset, software reset.Power management chip hardware watchdog, MCU will send out the pulse signal of house dog in real time, be fed
Dog, if single-chip microcontroller send feeding-dog signal mistake or do not send out feeding-dog signal single-chip microcontroller, be in reset state.
Preferably, the sensor software control in digital signal module specifically uses following process:
For PM sensor, power management module is powered on to particulate matter sensors control module；
Particulate matter sensors control module starting, into " initialization (Init) " state；
Control module controls sensor temperature in reduced levels；
Control module is set to enter " particle monitoring (PM Detect) " state；
Soot starts to gather, and interelectrode impedance is begun to decline, real-time detection output impedance；
When output impedance reaches given threshold after temperature-compensating, regenerative process starting is opened after sensor regeneration
When the monitoring circulation for beginning new, without particulate matter between electrode, interelectrode output is high impedance.As time goes by, carbon soot particles
It gathering between the electrodes, when but without forming bridge joint, keeping high impedance status between electrode.When having accumulated enough carbon between electrode
Smoke particle and when forming bridge joint, soot circuit start to reduce output impedance between electrode；
After reproductive success, related data is read, carries out data transmission according to agreement, relevant information is passed to microcontroller
Device.
For nitrogen oxide sensor, power management module is powered on to sensor control block；
Sensor control block starting；
Control sensor temperature；
NOx concentration and closed-loop control in real-time detection diesel engine after treatment SCR system；
Related data is read, carries out data transmission according to agreement, relevant information is passed to microcontroller, and be stored in SD
In card module.
For atmospheric temperature/humidity sensor, power management module is powered on to sensor control block；
Sensor control block starting；
Control sensor temperature/humidity；
Real-time detection atmospheric temperature/humidity；
Related data is read, carries out data transmission according to agreement, relevant information is passed to microcontroller, and be stored in SD
In card module.
For exhaust gas temperature sensor, power management module is powered on to sensor control block；
Sensor control block starting；
Control sensor temperature；
Real-time detection delivery temperature；
Related data is read, carries out data transmission according to agreement, relevant information is passed to microcontroller, and be stored in SD
In card module.
For differential pressure pickup, power management module is powered on to sensor control block；
Sensor control block starting；
Real-time detection pressure difference；
Related data is read, carries out data transmission according to agreement, relevant information is passed to microcontroller, and be stored in SD
In card module.
The invention has the advantages that a kind of mounted remote emission monitoring terminal for being integrated with multiple sensors is proposed,
Vehicle-mounted real-time data acquisition and monitoring may be implemented in the terminal, thus in the operating condition and tail gas of real-time monitoring diesel vehicle actual motion
NOXConcentration and particle concentration are horizontal.It can be to NO in diesel vehicle actual motion by the terminalXConcentration, particle concentration water
The information such as pressure difference carry out real-time monitoring and data acquisition before and after flat, SCR working efficiency, DPF, are long-range prison of the government to diesel vehicle
Measurement information provides foundation, also optimizes calibration for the pollutant maximum discharge bad working environments area of diesel vehicle actual motion for enterprise
Technical support is provided.By the invention, the discharge of the pollutant of diesel vehicle can not only be more efficiently supervised, can also be passed through
GPS positioning implements the location information of observation vehicle, energetically pushes grid motor connection and traffic programme and automobile Related product
Optimization and upgrading, monitoring and skill upgrading to automobile, field of traffic have positive facilitation.
The invention patent provides the above case study on implementation just for the sake of the description purpose of the present invention, and is not intended to limit this hair
Bright range.The scope of the present invention is defined by the following claims.It does not depart from spirit and principles of the present invention and makes various
Equivalent alterations and modifications should all cover within the scope of the present invention.
Claims (8)
1. a kind of mounted remote monitor terminal based on multiple sensors characterized by comprising
Power management module；GPRS module；GPS module；SD card module；Analog signal processing module；Digital signal processing module；
Communication module；Hardware watchdog module；Micro controller module；
Wherein, power management module: for other module for power supply；
GPRS module: wireless data transmission communication；
GPS module: satellite positioning；
SD card module: it controls wide lambda sensor and works normally, export air-fuel ratio, sensor temperature signals；
Analog signal processing module: handling analog signal, filtering, A/D conversion and Circuit fault diagnosis；
Digital signal processing module: handling digital signal, identification signal frequency or duty ratio；
Communication module: 1 tunnel CAN communication；
Hardware watchdog module: independently of the hardware watchdog except microcontroller, security monitoring is realized；
Micro controller module: logical operation and storage are realized.
2. a kind of mounted remote monitor terminal based on multiple sensors as described in claim 1, it is characterised in that:
The sensor that the digital signal processing module is related to has: nitrogen oxide sensor and/or PM sensor and/or delivery temperature
Sensor and/or DPF differential pressure pickup and/or atmospheric temperature humidity sensor.
3. a kind of mounted remote monitor terminal based on multiple sensors as described in claim 1, it is characterised in that:
For the communication module for communicating between automobile transmission data and car-mounted terminal, transmission data mainly include Engine ECU
Information and OBD failure stream information.
4. a kind of mounted remote monitor terminal based on multiple sensors as described in claim 1, it is characterised in that: the device
It acquires and parses main vehicle operation data in real time by digital signal processing module, including speed, engine speed, start
Machine load, motor instant oil consumption, accelerator pedal aperture, atmospheric pressure, intake air temperature, admission pressure, engine water temperature, exhaust
System temperature；
According to diagnosing protocol, the failure letter of vehicle and engine system is acquired and parsed in real time by analog signal processing module
Breath；
By these information after digital signal processing module and analog signal processing resume module, microcontroller is passed to,
The reset of microcontroller and peripheral hardware is controlled by hardware watchdog module；
Microcontroller is responsible for executing the progress of work of process control whole system, the SD card module based on semiconductor fast-flash memory device
Store corresponding information；
Car-mounted terminal acquires the operation data and the relevant parameter of post-processing of vehicle by CAN bus module, passes through GPS module
Then the location information parameter of acquisition time and vehicle sends the data of car-mounted terminal acquisition to remotely in real time by GPRS module
Server.
5. a kind of mounted remote monitor terminal based on multiple sensors as described in claim 1, it is characterised in that: power supply pipe
Reason module is divided into three parts:
1), 24V battery inputs, and 24V turns 5V output module, powers for system 5V logic power, powers to minimum system monolithic,
To CAN bus module for power supply and the matching power supply of serial data bus signal logic level；2), 5V turns 3.3V output, for GPS
Module for power supply and SD card module for power supply；
3), 24V turns 4.2V module, powers to GPRS module.
6. a kind of mounted remote monitor terminal based on multiple sensors as described in claim 1, it is characterised in that:
There are three operating modes for 1 tunnel CAN communication in the communication module: Normal Mode, Receive-only Mode
and Stand-by Mode.Normal mode is selected when INH=L, RM=H, that is, is worked normally；It is selected when INH=H, RM=H
It selects that number can only be received by CAN bus under this mode of Receive-only Mod when Stand-by mode, INH=L, RM=L
According to that cannot send data, the CAN controller that can prevent failure impacts the communication of entire CAN network.
7. a kind of mounted remote monitor terminal based on multiple sensors as claimed in claim 2, it is characterised in that:
The sensor that the digital signal processing module is related to has: nitrogen oxide sensor and/or PM sensor and/or delivery temperature
Sensor and/or DPF differential pressure pickup and/or atmospheric temperature humidity sensor are passed to the concrete mode of digital signal processing module
Are as follows:
Atmospheric temperature/humidity sensor: by atmospheric humidity and temperature transition at corresponding 0~5V voltage signal；
Nitrogen oxide sensor: the nitrous oxides concentration in tail gas is converted to CAN signal；
PM sensor: the concentration of PM in tail gas is converted to the relevant sensor regeneration period, and is converted into CAN signal；
Exhaust gas temperature sensor: the variation of temperature is converted into the variation of corresponding resistance；
Differential pressure pickup: the variation of pressure is converted into the variation of corresponding voltage.
8. a kind of mounted remote monitor terminal based on multiple sensors as described in claim 1, it is characterised in that:
The supply district of the GPS module: 3.0V to 3.6V.
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| CN111537412A (en) * | 2020-05-08 | 2020-08-14 | 重庆超力高科技股份有限公司 | Emission monitoring device, system and method |
| CN111929408A (en) * | 2020-07-21 | 2020-11-13 | 中汽研汽车检验中心（天津）有限公司 | Closed-loop supervision system for emission detection and maintenance of in-use motor vehicle |
| CN112486962A (en) * | 2020-11-23 | 2021-03-12 | 中汽研汽车检验中心（天津）有限公司 | Extraction and combination short segment calculation heavy-duty diesel vehicle NOxMethod of discharging |
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| CN113377186A (en) * | 2021-08-13 | 2021-09-10 | 深圳市有为信息技术发展有限公司 | Power management circuit, control method thereof, vehicle-mounted equipment and motor vehicle |
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