CN207249480U - A kind of SCR device fault detection system - Google Patents
A kind of SCR device fault detection system Download PDFInfo
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- CN207249480U CN207249480U CN201721353107.XU CN201721353107U CN207249480U CN 207249480 U CN207249480 U CN 207249480U CN 201721353107 U CN201721353107 U CN 201721353107U CN 207249480 U CN207249480 U CN 207249480U
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Abstract
A kind of SCR device fault detection system of the utility model, include main control module, show touch-control module, acquisition module, communication module, drive module, detection module and power module, the information collected is passed to main control module by the acquisition module, information after analyzing and processing is sent to communication module and display touch-control module by the main control module, user shows that the data collected carry out facility information monitoring according to the display touch-control module, and input control parameter is sent to main control module, main control module receives control information and is sent after combining gathered data processing to communication module or drive module.The systemic-function is distinguished clearly, can monitor the data such as the working condition of each component of tail gas treatment system of diesel engine in real time, shows that trouble location simultaneously provides maintenance direction, human-computer interaction interface is friendly, easy to operate.
Description
Technical field
The utility model belongs to SCR exhaust aftertreatment technical fields, more particularly to a kind of SCR device fault detection system.
Background technology
As requirement of the country to automobile exhaust emission standard is more and more tighter, engine aftertreatment system is as reduction diesel oil
The important means of tail gas pollutant emission is widely applied, for improve because exhaust emissions and caused by environmental pollution send out
Obvious action is waved.SCR device is according to nitrogen hydrogen reduction basic principle, using aqueous solution of urea as reducing agent, in catalyst table
Under the catalytic action of finishing coat, the NOX in exhaust gas is reduced into N2 and H2O, by working environment (motor exhaust high temperature and pressure),
Urea solution quality etc. influences, and common urea pump and sensor easily lose normal function, cause exhaust emissions not up to standard and pollute ring
Border.
For an urgent demand of current national standard discharge, solution exhaust emissions necessary hand up to standard is used as using urea pump
Section.Country's SCR system type is more at present, and product is various, and most of detection devices can not cover comprehensively, and monitor station is not portable
And execute-in-place, when failure, which can only dismantle, beams back genuine maintenance, adds the operating cost of equipment.
Core component of the urea injection system as after-treatment system.(1) to the detection of urea pump：It is concerned with its pump chamber
With the detection of outlet pressure, urea injecting quantity, atomization quality, temperature and urea pump part, such as pressure sensor, air valve,
Suck-back valve, heater strip etc..(2) to the detection of NOx sensor：The nitrogen oxygen value being concerned with before and after NOx sensor itself and reaction
It is whether normal.
Studies in China situation：Influenced by working environment (motor exhaust high temperature and pressure), urea solution quality etc., commonly use urea
Pump easily loses normal function, causes exhaust emissions not up to standard and pollutes environment.For an urgent demand of current national standard discharge, use
Urea pump necessary means up to standard as exhaust emissions is solved, are of great significance so developing urea pump detection device,
And contribute for motor vehicle exhaust emission and environmental protection.
The function of urea injection system (urea pump) detector is single and cumbersome on domestic market, not portable
Band.The urea pump detector of in the market, can not scene power supply inspection failure mostly with mains-supplied；Detection function is disperseed；Support
It is single to pump type；Display content it is simple and crude (can not real-time display respectively monitor dotted state, operation indicating can not be provided and trouble point is said
It is bright)；Can not autonomous setup parameter etc..
The patent that Yu Chaojun applies in June, 2016《Urea pump and NOx sensor Diagnostic Test Set in SCR system
(CN106050380A)》In propose a kind of SCR system diagnostic device, which includes master controller, CAN controller, power supply
Module and display system.It is CAN modes that the device, which connects NOx sensor and urea pump, for urea pump internal part
Any description is not done in signal acquisition and driving, the method for receiving simultaneously failure judgement dependent on CAN modes for it, in actual inspection
There is limitation, especially for the urea pump of non-CAN connections driving, this device does not have any diagnosis capability in repairing.
The patent that Bian Dunxin applies with single brightness in April, 2015《Urea pump testboard (CN204572417U)》In propose
A kind of urea pump internal fault detection device, the equipment include urea pump, detergent line and test pipeline.Urea pump in the equipment
Liquid returning end connecting test pipeline and then realize the failure of urea pump internal part is detected, but its system processing speed
Slowly, the shortcomings of human-computer interaction interface is not friendly enough, and urea pump is to form communication connection, cost by circuit and with control system
Height, real-time are relatively low.
Utility model content
For monitor station is not portable and execute-in-place, when failure, which can only dismantle, beams back genuine maintenance, can not scene
Power supply checks failure；Detection function is disperseed；Support that pump type is single；Display content it is simple and crude (can not real-time display respectively monitor point-like
State, can not provide operation indicating and trouble point explanation)；Can not autonomous setup parameter the problems such as, and provide one kind be based on Cortex-
The SCR device fault detection system of M3 processors, realizes urea pump (CAN connections and non-CAN connections), the detection of NOx sensor.
A kind of SCR device fault detection system of the utility model, for monitoring each portion of tail gas treatment system of diesel engine in real time
The working condition of part, display trouble location simultaneously maintenance direction is provided, include main control module, display touch-control module, acquisition module,
The information collected is passed to master control mould by communication module, drive module, detection module and power module, the acquisition module
Information after analyzing and processing is sent to communication module and display touch-control module by block, the main control module, and user is according to described
Display touch-control module shows that the data collected carry out facility information monitoring, and input control parameter is sent to main control module, main
Information after control module reception control information and combination acquisition process is sent to communication module or drive module.
Tail gas treatment system of diesel engine is mainly empty by catalyst converter, urea box, dosing unit, nozzle, sensor, compression
Gas tank, air filter etc. form.
Further, the information that the acquisition module collects includes pump pressure, spout pressure, fluid temperature, load
Electric current, liquid level.Wherein load current information is as output protection, real-time status of the other information as feedback pump.
Further, the communication module includes CAN communication module and bluetooth/serial communication module.Serial ports/the indigo plant
Tooth module supports the equipment such as PC or tablet to be monitored, Observable real time data.The CAN communication module supports CAN protocol to lead to
Letter, can be used CAN communication to read and test the urea pump of CAN connections control, and communicate with ECU.
Further, the drive module is non-CAN connections peripheral hardware, it is straight to equipment in pump using the drive circuit of equipment
Connect control.
Further, the CAN communication module and drive module driving main control module are to pump pressure, injection, pump electricity
Machine is driven control.
Further, the detection module carries out urea pump detection using nitrogen oxide sensor.Use CAN communication
Mode, reads and tests NOx sensor, and then to carry out the detection of the urea pump working effect of CAN connections.
Further, the display touch-control module carries out function debugging and man-machine interchange information using enlightening text screen, can also lead to
Cross bluetooth/serial ports and be connected to tablet or PC machine.It is stable and reliable in work using high resolution industrial enlightening Wen Ping, it is each what is collected
Kind data are shown to user.The primary input device of system, the debugging of functions and human-machine interactive information input are all logical
Touch-screen is crossed to realize.This touch-screen is resistance-type, and acquisition precision is 12, and operation accuracy is high.
Further, the power module can both connect alternating current or external automobile power supply, facilitate Site Detection to use, have
Short-circuit protection function.
A kind of SCR device fault detection system of the utility model is using enlightening Wen Ping as display touch-control module so that system
Human-computer interaction interface with visualization, touch operation.Cortex-M3 high speed processors are used in main control module, ensure that number
According to monitoring and control function realization.By human-computer interaction interface, each portion of tail gas treatment system of diesel engine can be monitored in real time
The data such as the working condition of part and the emitted dose of urea pump, temperature, pressure, show trouble location and provide maintenance direction；Meanwhile
The abnormal data shown according to display touch-control module, main control module are detected each component of tail gas treatment system of diesel engine,
Maintenance direction is provided for abort situation.
Brief description of the drawings
Fig. 1 is the block architecture diagram of the utility model SCR device fault detection system；
Fig. 2 is the fundamental diagram of the utility model SCR device fault detection system.
Embodiment
With reference to Fig. 1-2, a kind of SCR device fault detection system of the utility model, for monitoring in real time at diesel engine vent gas
The working condition of various parts is managed, trouble location is shown and maintenance direction is provided, includes main control module 10, display touch-control mould
Block 11, acquisition module 12, communication module 13, drive module 16, detection module 14 and power module 15, the acquisition module 12 will
The information collected passes to main control module 10, and the information after analyzing and processing is sent to communication module 13 by the main control module 10
With display touch-control module 11, user shows that the data collected carry out facility information prison according to the display touch-control module 11
Control, and input control parameter is sent to main control module 10, main control module 10 receives control information and combines the letter after acquisition process
Breath is sent to communication module 13 or driving detection module 14.
The main control module 10 uses STM2F103 chips.
Tail gas treatment system of diesel engine is mainly empty by catalyst converter, urea box, dosing unit, nozzle, sensor, compression
Gas tank, air filter etc. form.
The information that the acquisition module 12 collects includes pump pressure, spout pressure, fluid temperature, load current, liquid
Position.Wherein load current information is as output protection, real-time status of the other information as feedback pump.
The communication module 13 includes CAN communication pattern 131 and bluetooth/serial communication module 132.Bluetooth/the string
Mouth communication module 132 supports the equipment such as PC or tablet to be monitored, Observable real time data.The CAN communication module 131 is supported
CAN protocol communicates, and CAN communication can be used to read and test the urea pump of CAN connections control, and communicate with ECU.The driving
Module 16 directly controls equipment in pump using the drive circuit of equipment.
The CAN communication module 131 and the drive module 16 driving main control module to pump pressure, injection, pump motor into
Row control.
The detection module 14 carries out urea pump detection using nitrogen oxide sensor.Using the mode of CAN communication, read
Take and test NOx sensor, and then to carry out the detection of the urea pump working effect of CAN connections.
The display touch-control module 11 carries out function debugging and man-machine interchange information using enlightening text screen.Using high-resolution work
Industry enlightening Wen Ping, it is stable and reliable in work, the various data collected are shown to user.The primary input device of system, each several part
The debugging of function and human-machine interactive information input are realized by touch-screen.This touch-screen is resistance-type, acquisition precision
For 12, operation accuracy is high.
The power module 15 can both connect alternating current or external automobile power supply, facilitate Site Detection to use, and there is short circuit to protect
Protective function.
When display touch-control module 11 shows that pump pressure value exceeds normal range value, main control module 10 examines urea pump
Survey, maintenance direction is given for abort situation.
When display touch-control module 11 shows spout pressure value not in normal range value, main control module 10 examines nozzle
Survey, maintenance direction is given for abort situation.
When display touch-control module 11 shows that fluid temperature exceeds normal range value, main control module 10 is respectively to urea box and biography
Sensor is detected, and maintenance direction is given for abort situation.
When display touch-control module 11 shows that load current exceeds normal range value, main control module 10 is to urea nozzle solenoid valve
It is detected, maintenance direction is given for abort situation.
When display touch-control module 11 shows that liquid level exceeds normal range value, main control module 10 is respectively to urea box and sensor
It is detected, maintenance direction is given for abort situation.
Maintenance direction：
Sensor is easier to break down, and most common failure is：Liquid level display is inaccurate, and temperature display is abnormal, and trouble light is normal
It is bright and quote liquid level and temperature sensor failure etc..The reason for causing this kind of failure be mainly：Sensor degradation, sensor plug-in part
Virtual connection, short circuit, and related harness failure.Sometimes, liquid level and temperature sensor and main engine plants' electrical parameter, which mismatch, will also result in liquid
Position, temperature anomaly, or even quote sensor fault.
First, urea liquid level sensor voltage is higher than the upper limit (being less than lower limit) --- the sensor plug-in part withdraw of the needle.
Phenomenon of the failure：Trouble light, OBD lamps are always on, and are quoted and are dodged code 445 (urea liquid level sensor voltage is higher than the upper limit), instrument
The display of urea level is inaccurate in table.
Failure mechanism：This failure is typically due to sensor harness or connector open circuit causes, and please check that sensor patches
Whether No. 1 stitch of part (ECU stitch K57) there is open circuit, the failure with power supply short circuit.If cannot solve, it is further checked
Whether his stitch, harness are faulty.
Possible cause：1) urea liquid level sensor connector or the big plug withdraw of the needle of overall wire sheaves；2) urea level harness is opened
Road or virtual connection；3) K57 and power supply short circuit；4) urea liquid level sensor damages.
It is actual to solve method and step：1) urea liquid level sensor connector and harness are checked；2) urea level biography is pulled up
Sensor connector, checks for the stitch withdraw of the needle and causes harness to open a way；3) if any retightening contact pin.
2nd, urea level, temperature display are abnormal --- and sensor parameters and main engine plants require product to mismatch.
Phenomenon of the failure：Urea level display it is inaccurate (such as urea it is seldom when, instrument shows urea 100%), urea temperature
Degree is very big with current environmental temperature difference, and does not quote related sensor failure.
Failure mechanism：This failure is typically due to the mismatch that urea box sensor is specified with main engine plants, or vehicle
Urea box was replaced so that the model before the sensor inside urea box dispatches from the factory from former car is different.The electrical parameter of sensor is not
Together, data scaling is caused to mismatch, liquid level temperature display mistake.
Possible cause：1) driver has replaced urea box, different from former car urea box；2) when vehicle factor is supporting, independent procurement
Urea box, but re-scale data without notice main engine plants technical staff；3) sensor or related harness are damaged, and cause electric appliance
Parameters variation (this possibility is smaller), but do not quote sensor dependent failure；
It is actual to solve method and step：1) urea box and sensor are checked, is verified whether identical with former car urea box；2) urinate
The failure of plain failure of pump urea pump mainly has two aspects, mechanical breakdown and apparatus failure.Apparatus failure refers generally to 12 holes and patches
The relevant electrical part failure of part, including urea pump motor, urea pressure sensor, reversal valve and urea pump resistive heater, therefore
Barrier rate is of a relatively high；Mechanical breakdown refers to urea pump and blocks, pressure is built caused by urea pump internal mechanical part failure unsuccessfully etc..In short,
With the failure of SCR urea pressure correlations, first have to check urea pipe whether wrong, blocking, leakage, whether urea pump block
Deng.
3rd, SCR urea pressure establishes mistake.
Phenomenon of the failure：Each sport car a few minutes, trouble light, OBD lamps were always on, and will quote 441 (SCR to after dozens of minutes
Urea pressure establishes mistake) failure, urea do not consume.
Failure mechanism：Before urea injection, urea is established the pressure to 9bar by urea pump, is passed by the pressure in urea pump
Sensor is detected.After engine start, urea pump is repeatedly attempted to build urea pressure, as urea pressure does not reach still
9bar, will quote this failure.
This failure causes reason to be generally：Urea amount is very few, urea pipe is reversed, imbibition blockage or gas leakage, pressure
Pipe leakage etc., only a few are because urea failure of pump.
Possible cause：1) urea amount is very few；2) pipette wrong, blocking or gas leakage；3) pressure pipe is revealed；4) urea pump blocks up
Plug or urea pump mechanical breakdown.
It is actual to solve method and step：1) check whether urea level is enough；2) check urea pipe whether wrong, connect
Instead；3) check whether pipette bends, blocks；4) check pipette, pressure pipe with the presence or absence of the trace revealed；5) do not have more than
After problem, check whether urea pump interface has obvious clogging；6) after replacing urea pump, Failure elimination, urea normally builds pressure.
Conclusion：Under normal circumstances, urea pipe wrong, blocking, leakage easily cause this failure, but current failure is because urea pump
Internal mechanical breakdown, can not normally inhale urea, cause to build pressure failure.
Conclusion：Under normal circumstances, urea pipe wrong, blocking, leakage easily cause this failure, but current failure be because
For the mechanical breakdown inside urea pump, urea can not be normally inhaled, causes to build pressure failure.
4th, the structure failure of Nozzle failures nozzle mainly has：
A, nozzle solenoid valve failure：Connector, harness damage, cause open circuit, short circuit etc.；Magnet valve coil burnout, Ke Yitong
Measurement resistance is crossed to be judged.
B, nozzle mechanical breakdown：Since the urea quality of addition is poor, or nozzle aging, cause urea nozzle abrasion (past
Toward that can cause, urea consumption is high)；Since urea crystals or other particulate matters enter, cause spray nozzle clogging；Or since other are former
Cause, causes nozzle variant, fracture etc..More than, every failure that can influence urea injection and discharge, is likely to limitation engine
Moment of torsion.
5th, the driving of SCR urea nozzles is high-end to power supply short circuit.
Phenomenon of the failure：Trouble light, OBD lamps are always on, and quote 453 (SCR urea nozzles drive high-end to power supply short circuit)
Failure.Failure mechanism：Urea nozzle solenoid valve has two stitch, and K09, K10 correspond to connector numbering 2, K10 refers to the drive of solenoid valve
It is dynamic high-end, K09 driving low sides.What this failure referred to is exactly K10 stitch and power supply short circuit, need to check K10 connectors and harness.May
Reason：1) connector failure, causes K10 power supply short circuits；2) K10 correlations harness failure, causes and external power supply short circuit.
It is actual to solve method and step：1) check nozzle connector, do not damage or short-circuit；2) K10 stitch voltages are measured,
About 24V, beyond normal range (NR)；3) check the big plug of overall wire sheaves, find nozzle K10 harness and other powered harness short circuits；4)
After repairing harness, Failure elimination.
Conclusion：Nozzle harness (K10) and power supply short circuit in the big plug of overall wire sheaves.2nd, urea consumption is larger --- add
Add urea inferior, cause nozzle wear to reveal phenomenon of the failure.
During using this SCR device fault detection system, serial ports in the enlightening Wen Ping and communication module 13 of touch-control module 11 is shown
Or the equipment such as bluetooth connection PC machine or tablet has the function of emitted dose, temperature, pressure of urea pump etc. real time monitoring, display
The enlightening Wen Ping of touch-control module 11 is also controlled output to pump motor, nozzle etc..When detecting urea pump, NOx sensor, it can be selected
CAN connections and non-CAN connection modes, real-time, error detecing capability are strong etc., and for the urea pump that non-CAN connections drive, have
Stronger diagnosis capability.
The utility model is described in detail above, it is described above, be only the utility model preferred embodiment and
, it is when the utility model practical range cannot be limited, i.e., all to make equivalent changes and modifications according to the application scope, it all should still belong to this
In utility model covering scope.
Claims (10)
1. a kind of SCR device fault detection system, for monitoring the working condition of each component of tail gas treatment system of diesel engine in real time,
Display trouble location simultaneously provides maintenance direction, it is characterised in that：Include main control module, show touch-control module, acquisition module, lead to
The information collected is passed to main control module by news module, drive module, detection module and power module, the acquisition module,
Information after analyzing and processing is sent to communication module and display touch-control module by the main control module, and user is according to the display
Touch-control module shows that the data collected carry out facility information monitoring, and input control parameter is sent to main control module, master control mould
Block receives control information and is sent after combining gathered data processing to communication module or drive module.
2. SCR device fault detection system according to claim 1, it is characterised in that：What the acquisition module collected
Information includes chooses any one kind of them or a variety of in pump pressure, spout pressure, fluid temperature, load current, liquid level.
3. SCR device fault detection system according to claim 2, it is characterised in that：When display touch-control module display pump
Pressure value exceeds normal range value, and main control module is detected urea pump, and maintenance direction is given for abort situation.
4. SCR device fault detection system according to claim 3, it is characterised in that：When display touch-control module display spray
For mouth pressure value not in normal range value, main control module is detected nozzle, and maintenance direction is given for abort situation.
5. SCR device fault detection system according to claim 4, it is characterised in that：When display touch-control module shows liquid
Temperature exceeds normal range value, and main control module is respectively detected urea box and sensor, gives and ties up for abort situation
Repair guidance.
6. SCR device fault detection system according to claim 5, it is characterised in that：Born when display touch-control module is shown
Carry electric current and exceed normal range value, main control module is detected urea nozzle solenoid valve, and giving maintenance for abort situation refers to
Lead.
7. SCR device fault detection system according to claim 6, it is characterised in that：When display touch-control module shows liquid
Position exceeds normal range value, and main control module is respectively detected urea box and sensor, and giving maintenance for abort situation refers to
Lead.
8. SCR device fault detection system according to claim 1, it is characterised in that：The communication module includes CAN
Communication module and bluetooth/serial communication module, the CAN communication module and drive module driving main control module are to pump pressure
Power, injection, pump motor are driven control.
9. SCR device fault detection system according to claim 1, it is characterised in that：The detection module uses nitrogen oxygen
Chemical sensors carry out urea pump working effect detection.
10. SCR device fault detection system according to claim 1, it is characterised in that：The display touch-control module uses
Di Wen screens carry out function debugging and man-machine interchange information.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110243614A (en) * | 2019-07-12 | 2019-09-17 | 上海星融汽车科技有限公司 | The detection system of vehicle exhaust SCR |
| CN111120061A (en) * | 2019-12-30 | 2020-05-08 | 广州城市职业学院 | SCR system monitoring and fault diagnosis equipment and method |
| CN111870201A (en) * | 2020-08-04 | 2020-11-03 | 上海明略人工智能(集团)有限公司 | Method and device for determining faults of dish washing machine and storage medium |
| CN111963287A (en) * | 2020-08-21 | 2020-11-20 | 中国重汽集团济南动力有限公司 | OBD interaction system, method and device for vehicle engine and post-processing |
| CN112282904A (en) * | 2020-10-30 | 2021-01-29 | 上海星融汽车科技有限公司 | Method for detecting voltage build-up fault of SCR system |
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2017
- 2017-10-19 CN CN201721353107.XU patent/CN207249480U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110243614A (en) * | 2019-07-12 | 2019-09-17 | 上海星融汽车科技有限公司 | The detection system of vehicle exhaust SCR |
| CN110243614B (en) * | 2019-07-12 | 2020-12-04 | 上海星融汽车科技有限公司 | Detection system for automobile exhaust SCR |
| CN111120061A (en) * | 2019-12-30 | 2020-05-08 | 广州城市职业学院 | SCR system monitoring and fault diagnosis equipment and method |
| CN111870201A (en) * | 2020-08-04 | 2020-11-03 | 上海明略人工智能(集团)有限公司 | Method and device for determining faults of dish washing machine and storage medium |
| CN111963287A (en) * | 2020-08-21 | 2020-11-20 | 中国重汽集团济南动力有限公司 | OBD interaction system, method and device for vehicle engine and post-processing |
| CN112282904A (en) * | 2020-10-30 | 2021-01-29 | 上海星融汽车科技有限公司 | Method for detecting voltage build-up fault of SCR system |
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