CN108425723A - In-use automotive tail gas clean-up DePM ＆ NOx systems and control method - Google Patents
In-use automotive tail gas clean-up DePM ＆ NOx systems and control method Download PDFInfo
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- CN108425723A CN108425723A CN201810234336.2A CN201810234336A CN108425723A CN 108425723 A CN108425723 A CN 108425723A CN 201810234336 A CN201810234336 A CN 201810234336A CN 108425723 A CN108425723 A CN 108425723A
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- 238000000034 method Methods 0.000 title claims description 23
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 130
- 239000004202 carbamide Substances 0.000 claims abstract description 130
- 239000007921 spray Substances 0.000 claims abstract description 20
- 238000001514 detection method Methods 0.000 claims description 51
- 238000004891 communication Methods 0.000 claims description 46
- 238000010438 heat treatment Methods 0.000 claims description 42
- 238000002347 injection Methods 0.000 claims description 23
- 239000007924 injection Substances 0.000 claims description 23
- 230000005611 electricity Effects 0.000 claims description 16
- 238000012544 monitoring process Methods 0.000 claims description 16
- 230000004224 protection Effects 0.000 claims description 15
- 230000008569 process Effects 0.000 claims description 13
- 229910000838 Al alloy Inorganic materials 0.000 claims description 9
- 239000008236 heating water Substances 0.000 claims description 8
- 239000003054 catalyst Substances 0.000 claims description 7
- 238000012360 testing method Methods 0.000 claims description 7
- 210000002700 urine Anatomy 0.000 claims description 7
- 230000004913 activation Effects 0.000 claims description 6
- 238000005213 imbibition Methods 0.000 claims description 6
- 238000010257 thawing Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 239000000243 solution Substances 0.000 claims description 5
- WTHDKMILWLGDKL-UHFFFAOYSA-N urea;hydrate Chemical compound O.NC(N)=O WTHDKMILWLGDKL-UHFFFAOYSA-N 0.000 claims description 5
- 230000002093 peripheral effect Effects 0.000 claims description 4
- 241000009298 Trigla lyra Species 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000003745 diagnosis Methods 0.000 claims description 3
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- 239000012528 membrane Substances 0.000 claims description 3
- 230000001939 inductive effect Effects 0.000 claims 1
- 239000007788 liquid Substances 0.000 claims 1
- 230000001360 synchronised effect Effects 0.000 abstract description 6
- 230000008901 benefit Effects 0.000 abstract description 4
- 238000000746 purification Methods 0.000 abstract description 4
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 119
- 239000007789 gas Substances 0.000 description 33
- 239000013618 particulate matter Substances 0.000 description 10
- 230000003647 oxidation Effects 0.000 description 5
- 238000007254 oxidation reaction Methods 0.000 description 5
- 238000010926 purge Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 239000002912 waste gas Substances 0.000 description 2
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- 230000006866 deterioration Effects 0.000 description 1
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- 238000011069 regeneration method Methods 0.000 description 1
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- 230000009466 transformation Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
- F01N11/002—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus
- F01N11/005—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus the temperature or pressure being estimated, e.g. by means of a theoretical model
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
- F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N9/00—Electrical control of exhaust gas treating apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/148—Arrangement of sensors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1486—Means to prevent the substance from freezing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The invention discloses a kind of in-use automotive tail gas clean-up DePM＆NOx systems, including the spray of DOC modules, POC modules, SCR modules, urea plus module, differential pressure pickup unit, exhaust temperature sensor unit, NOx sensor unit and DePM＆NOx controllers；DOC modules are mounted on the inflator of engine front row, and POC modules are connected to the rear side of DOC modules, and SCR modules are connected to the rear side of POC modules, and urea spray plus module are connected between SCR modules and POC modules.Above-mentioned in-use automotive tail gas clean-up DePM＆NOx systems use the form of DOC+POC+SCR synchronous controls, drop is except the most of PM and NOx in diesel engine vent gas simultaneously, efficiently solve the problems, such as exhaust pollution of diesel engines object PM and NOx synchronous purification, overall application is at low cost, good economical benefit.
Description
Technical field
The present invention relates to Vehicular exhaust processing technology fields, and in particular to a kind of in-use automotive tail gas clean-up DePM＆NOx systems
And control method.
Background technology
In recent years, with the continuous upgrading of China's exhaust gas from diesel vehicle discharge standard, the discharge of most of diesel automobile in use
The horizontal requirement that the discharge standard newly promulgated far is not achieved, each department one after another to discharge it is not up to standard with diesel powered vehicles into
Row discharge upgrading processing reduces pollutant emission to ensure that its discharge meets current law requirement.The tail now used mostly
In gas purification scheme, the form for installing DPF (Diesel Particulate Filter diesel particulate filters) device additional is mostly used
Carry out PM (particulate matter) purified treatment in tail gas.
But the defect and deficiency of the prior art：1, the PM substances that DPF device is merely able in filtering tail gas are installed additional, PM only exists
With a part for the pollutant that exhaust gas from diesel vehicle discharges, there are more NOx (nitrogen oxides) in exhaust gas from diesel vehicle, NOx is to make
An important factor at polluting weathers such as hazes.2, in-use automotive installs DPF device additional, due to not being DPF when engine and vehicle manufacture
Regeneration calibration, be easy to cause DPF carbon deposits and excessively blocks, and causes engine system exhaust back pressure to increase, and then engine is caused to fire
Burn the application problems such as deterioration, oil consumption increase, engine power output decrease.3, in-use automotive install additional DPF system need frequently into
Row deashing is safeguarded, influences the just common vehicle of car owner, and application cost is high, overall economic effect is general.
Invention content
The technical problem to be solved by the present invention is to overcome the deficiencies in the prior art, provide a kind of in-use automotive tail gas clean-up
DePM＆NOx systems and control method using the form of DOC+POC+SCR synchronous controls, while being dropped except big in diesel engine vent gas
Part PM and NOx efficiently solve the problems, such as exhaust pollution of diesel engines object PM and NOx synchronous purification, and overall application is at low cost,
Good economical benefit.
In order to achieve the above objectives, the technical solution adopted by the present invention is：A kind of in-use automotive tail gas clean-up DePM＆NOx systems,
It is passed including DOC modules, POC modules, SCR modules, urea spray plus module, differential pressure pickup unit, exhaust temperature sensor unit, NOx
Sensor cell and DePM＆NOx controllers；The DOC modules are mounted on the inflator of engine front row, and POC modules are connected to DOC moulds
The rear side of block, SCR modules are connected to the rear side of POC modules, and urea spray plus module are connected between SCR modules and POC modules；
The differential pressure pickup unit is simultaneously in DOC modules and POC modules；Exhaust temperature sensor unit is installed respectively
On the front end exhaust tube of DOC modules and the rear end exhaust tube of POC modules；NOx sensor unit is separately mounted to urea spray and adds
On the exhaust tube of module front and on the exhaust tube of SCR modules rear end；
The urea spray plus module include urea pump, urea box and urea nozzle, and urea box is mounted on vehicle chassis, urine
Element pump is connected on urea box, and urea nozzle is connected in the outlet of urea pump.
The DePM＆NOx controllers include controller circuit board, cast aluminium alloy protection shell and 64 needle Wiring harness connectors；
Wherein, controller circuit board includes that power protecting circuit, DC24V turn DC5V circuits, DePM＆NOx controllers MCU
The front-seat temperature input of (Microprogrammed Control Unit) circuit, rotating speed Acquisition Circuit, T15 signal input circuits, DOC
The front-seat warm input circuit of circuit, pressure difference input circuit, SCR, SCR heel row temperature input circuit, intake air temperature input circuit, air inlet pressure
Power input circuit, NTC temperature collection circuits, PWM wave driving circuit, PWM wave driving testing circuit, urea pipe computer heating control and
Detection circuit, RS485 telecommunication circuits, RS232 telecommunication circuits, CAN communication circuit, the other peripheries of urea level temperature input circuit
Circuit etc.；
Other peripheral circuits include program writing BDM circuits, anti-static electricity interference circuit；
Cast aluminium alloy protection shell includes cast aluminium alloy protection shell and polymeric membrane waterproof and breathable plug；
Urea pipe computer heating control and detection circuit include urea pipe heater circuit, urea box heating water valve circuit,
Total heating relay circuit, SCR power supply relays, imbibition pipeline heating detection circuit, injection line heating detection circuit, reflux
Pipeline heating detection circuit, urea box heat water valve detection circuit.
The DePM＆NOx controllers MCU circuits are handled using Freescale MC9S12 series embedded scms
Device, the power protecting circuit carry out reverse power connection protection using the insurance of self- recoverage patch and TVS pipe, diode etc., and DC24V turns
DC5V circuits complete conversion of the DC24V voltages to DC5V voltages using LM2596 family chips.
The rotating speed Acquisition Circuit is using the tacho-pulse information of resistor voltage divider circuit acquisition engine, the T15
Signal input circuit acquires engine ignition signal key door T15 information by resistor voltage divider circuit.
The front-seat warm input circuits of the DOC, the front-seat warm input circuits of SCR, SCR heel row temperature input circuit, intake air temperature are defeated
Enter circuit, NTC temperature collection circuits, urea level temperature input circuit and uses resistor voltage divider circuit acquisition system respective sensor
Information.
The admission pressure input circuit, pressure difference input circuit directly adopt circuit acquisition respective sensor letter by using voltage
Breath.
The CAN communication circuit is by acquiring NOx sensor Receive message system NOx sensor information in CAN bus.
The RS485 telecommunication circuits, RS232 telecommunication circuits, CAN communication circuit pass through corresponding communication line and vehicle-mounted prison
Control device information interaction.
In the airless SCR system, the PWM wave driving circuit is driven by high-power MOS tube and is controlled by pwm signal
Urea pump and nozzle, PWM wave driving testing circuit pass through integrated circuit detection chip detect activation bit；Formula SCR is helped in gas
In system, urea injecting quantity message is sent to urea pump by the DePM＆NOx controllers MCU circuits by CAN communication circuit.
The anti-static electricity interference circuit is by capacitance and the external electrostatic of resistance combined filter circuit for eliminating to the electrostatic of system
Interference.
The urea pipe heater circuit, always heats relay circuit, SCR power supplys at urea box heating water valve circuit
Relay circuit controls the control that chip completes relay by integrated driving.
The imbibition pipeline heating detection circuit, injection line heating detection circuit, return line heating detection circuit, urine
Plain case heating water valve detection circuit is realized by current detecting chip circuit to be detected.
A kind of in-use automotive tail gas clean-up DePM＆NOx system control methods, which is characterized in that include the following steps：
After step 1, vehicle or engine work, controller circuit board passes through rotating speed Acquisition Circuit, T15 signal input circuits
Vehicle operating status information is obtained, by controlling SCR power relay circuits entire DePM＆NOx system power supplies are connected,
System starts to work comprehensively；
After step 2, vehicle or engine run a period of time, when DePM＆NOx controller MCU circuits pass through the front-seat temperature of DOC
When the front-seat warm input circuit of input circuit, SCR, SCR heel row temperature input circuits detect that SCR system meets operating condition, pass through
NOx sensor and NOx sensor information is obtained before and after CAN communication Circuit activation SCR, and is calculated by related software calculating logic
Go out urea solution injection quantity needed for SCR system, helps urea pump to spray urea water or pass through without gas by the driving of PWM wave driving circuit
CAN communication circuit control gas helps formula urea pump to spray urea water；
In all processes of step 3, vehicle or engine operation, DePM＆NOx controller MCU circuits pass through the front-seat temperature of DOC
Input circuit, pressure difference input circuit, the working condition for continuing to monitor DOC and POC, at the both ends DOC+POC, pressure difference is continued above one
In the case of threshold value, by alert, the front-seat warm input circuits of SCR are simultaneously communicated by RS485 telecommunication circuits or RS232
Warning message is sent to vehicle-mounted monitoring apparatus by circuit or CAN communication circuit；
In all processes of step 4, vehicle or engine operation, DePM＆NOx controller MCU circuits pass through the front-seat temperature of SCR
Input circuit, SCR heel row temperature input circuits persistently detect temperature before and after SCR catalyst, and are persistently obtained by CAN communication circuit
NOx sensor information before and after SCR, final detect and diagnose SCR system working condition in real time, when system jam is arrived in diagnosis
When, alert, and sent warning message by RS485 telecommunication circuits or RS232 telecommunication circuits or CAN communication circuit
To vehicle-mounted monitoring apparatus；
In all processes of step 5, vehicle or engine operation, DePM＆NOx controller MCU circuits are acquired by rotating speed
The front-seat warm input circuit of circuit, T15 signal input circuits, DOC, pressure difference input circuit, the front-seat warm input circuits of SCR, SCR heel row
Warm input circuit, intake air temperature input circuit, admission pressure input circuit, NTC temperature collection circuits detect various kinds of sensors
State, when short circuit or short trouble occur for sensor, alert, and communicated by RS485 telecommunication circuits or RS232
Warning message is sent to vehicle-mounted monitoring apparatus by circuit or CAN communication circuit；
In all processes of step 6, vehicle or engine operation, when outer atmospheric temperature is less than subzero 5 DEG C, DePM＆
NOx controller MCU circuits are heated come control piper by urea pipe computer heating control and detection circuit and detect each heating tube
Road heated condition, when fuser malfunction occurs, alert, and by RS485 telecommunication circuits or RS232 telecommunication circuits or
Warning message is sent to vehicle-mounted monitoring apparatus by CAN communication circuit.
A kind of in-use automotive tail gas clean-up DePM＆NOx system control methods, which is characterized in that include the following steps：
1., the detection of engine ignition key door T15 signal conductions, the initial conditions of this state also non-system；
2., judge whether T15 signals are connected, detection T15 signal voltages whether reach setting threshold values, if conducting if program
Into next step operation, otherwise system continuation is in most initial state；
3., by step 2. after, control SCR system power supply relay conducting, give whole system power supply；
4., by step 2. after, persistently detect T15 signals and whether there is, if detecting that 15 signals disconnect, control and be
System carries out step and 5. operates；
5., by step 4. after, control urea pump stop injection work；
6., by step 5. after, control urea pump carry out trepanning work；
7., by step 6. after, control SCR system voltage un relay power operations, system stops completely；
8., by step 3. after, exhaust temperature sensor is believed before the differential pressure pickup confidence at detection DOC and POC both ends, DOC
Exhaust temperature sensor information before breath, SCR judges whether the pressure difference at the both ends DOC and POC is more than the threshold values limited；If being less than valve
Value, then DOC and POC is normal operating conditions, if it exceeds then DOC and POC are blocked threshold values, carries out step in next step and 9. grasps
Make；
9., by step 8. after, provide the super threshold values warning message of differential pressure pickup, and logical by CAN communication or RS232
Warning message is passed to vehicle-mounted monitoring apparatus by letter or RS485 communications；
10., by step 3. after, detect SCR system state, obtain engine work when rotating speed, torque and waste gas stream
The information such as amount；And whether heated according to system status information decision-making system, it is heated if necessary, then in next step
Carry out stepIf you do not need to heating, then carry out step in next step
By step 1. after, heated if necessary, then carry out this step, to urea pipe, urea box, urine
Element pump etc. carries out heating defrosting operation；
Whether the heating defrosting such as detection urea pipe, urea box and urea pump is completed, if do not completed, continues stepIf completed, step is carried out
Judge whether SCR system reaches injection conditions, if reaching injection conditions, carries out stepIf do not reached
To injection conditions, then step is carried out 1.；
According to SCR system state, initial urea injecting quantity is calculated, and controls urea pump and is sprayed according to this amount
It penetrates；
Judge Vehicular exhaust NOx rows in conjunction with the numerical value that NOx sensor before and after SCR is fed back according to SCR system state
It puts and whether reaches target, if meeting target, continue according to stepIt carries out, if not meeting target, carries out step
StepUrea injecting quantity is readjusted to be walked after control urea pump is sprayed according to new emitted dose
Suddenly
Due to the application of the above technical scheme, the present invention has following advantages compared with prior art：
It using the form of DOC+POC+SCR synchronous controls, while dropping except the most of PM and NOx in diesel engine vent gas, has
Solves the problems, such as exhaust pollution of diesel engines object PM and NOx synchronous purification to effect.Wherein DOC is diesel oxidation catalyst
(Diesel Oxidation Catalyst), for dropping except the SOF ingredients in gaseous state CO, THC and particulate matter in tail gas；
POC is particle oxidation catalyst (Particle Oxidation Catalyst), can be oxidized to NO in tail gas in DOC
Under NO2 effects, by carbon deposit of the NO2 oxidation filterings on POC, effectively the PM except in tail gas about 6% is filtered and drops to realize.
Compared to the wall-flow type carrier used with DPF, system back pressure substantially reduces, and engine combustion is barely affected, hair
It is almost consistent before motivation oil consumption and power output and installation exhaust gas processing device.
System need not carry out frequent deashing maintenance, it is only necessary to which every regular dismounting inspection in 3~6 months is not influencing car owner just
Common vehicle, at low cost compared to DPF system, car owner only needs the urea for vehicle water of 32.5% concentration of addition, overall application when application
It is at low cost, good economical benefit.
Description of the drawings
Technical scheme of the present invention is further explained below in conjunction with the accompanying drawings：
Attached drawing 1 is the arrangement relation schematic diagram of in-use automotive tail gas clean-up DePM＆NOx systems of the present invention；
Attached drawing 2 is the operation principle schematic diagram of the present invention；
Attached drawing 3 is the control process schematic of the present invention.
Specific implementation mode
With reference to specific embodiment, the present invention is described in further detail.
Embodiment 1
A kind of in-use automotive tail gas clean-up DePM＆NOx systems as shown in Figure 1 to Figure 3, including DOC modules, POC modules,
SCR modules, urea spray plus module, differential pressure pickup unit, exhaust temperature sensor unit, NOx sensor unit and DePM＆NOx controls
Device processed；The DOC modules are mounted on the inflator of engine front row, and POC modules are connected to the rear side of DOC modules, the connection of SCR modules
In the rear side of POC modules, urea spray plus module are connected between SCR modules and POC modules；
The differential pressure pickup unit is simultaneously in DOC modules and POC modules；Exhaust temperature sensor unit is installed respectively
On the front end exhaust tube of DOC modules and the rear end exhaust tube of POC modules；NOx sensor unit is separately mounted to urea spray and adds
On the exhaust tube of module front and on the exhaust tube of SCR modules rear end；
The urea spray plus module include urea pump, urea box and urea nozzle, and urea box is mounted on vehicle chassis, urine
Element pump is connected on urea box, and urea nozzle is connected in the outlet of urea pump.
DePM＆NOx controllers include controller circuit board, cast aluminium alloy protection shell and 64 needle Wiring harness connectors；
Wherein, controller circuit board includes that power protecting circuit 4, DC24V turn DC5V circuits 5, DePM＆NOx controllers
Before the front-seat warm input circuit 9 of MCU circuits 6, rotating speed Acquisition Circuit 7, T15 signal input circuits 8, DOC, pressure difference input circuit, SCR
The warm input circuit 11 of row, SCR heel row temperature input circuit 12, intake air temperature input circuit 13, admission pressure input circuit 14, NTC
Temperature collection circuit 15, PWM wave driving circuit 16, PWM wave driving testing circuit 17, urea pipe computer heating control and detection circuit
18, RS485 telecommunication circuits 19, RS232 telecommunication circuits, CAN communication circuit 21, urea level temperature input circuit 22 and periphery electricity
Road 23；
Wherein, other peripheral circuits 23 include program writing BDM circuits, anti-static electricity interference circuit；
Wherein, cast aluminium alloy protection shell includes cast aluminium alloy protection shell and polymeric membrane waterproof and breathable plug；
Wherein, urea pipe computer heating control and detection circuit 18 include urea pipe heater circuit, urea box heating water
Valve circuit always heats relay circuit, SCR power supply relays, imbibition pipeline heating detection circuit, injection line heating detection electricity
Road, return line heating detection circuit, urea box heat water valve detection circuit.
DePM＆NOx controller MCU circuits 6 use Freescale MC9S12 series embedded scm processors, the electricity
Protection circuit 4 carries out reverse power connection protection using the insurance of self- recoverage patch and TVS pipe, diode etc., and DC24V turns DC5V circuits
5 complete conversion of the DC24V voltages to DC5V voltages using LM2596 family chips.
Rotating speed Acquisition Circuit 7 is using the tacho-pulse information of resistor voltage divider circuit acquisition engine, the T15 signals input
Circuit 8 acquires engine ignition signal key door T15 information by resistor voltage divider circuit.
The front-seat warm input circuits 9 of DOC, the front-seat warm input circuits 11 of SCR, SCR heel row temperature input circuit 12, intake air temperature are defeated
It is corresponding using resistor voltage divider circuit acquisition system to enter circuit 13, NTC temperature collection circuits 15, urea level temperature input circuit 22
Sensor information.
Admission pressure input circuit 13, pressure difference input circuit directly adopt circuit acquisition respective sensor letter by using voltage
Breath.
CAN communication circuit 21 is by acquiring NOx sensor Receive message system NOx sensor information in CAN bus.
RS485 telecommunication circuits 19, RS232 telecommunication circuits, CAN communication circuit 21 pass through corresponding communication line and vehicle-mounted prison
Control device information interaction.
In airless SCR system, the PWM wave driving circuit 16 is controlled by high-power MOS tube driving by pwm signal
Urea pump and nozzle, PWM wave driving testing circuit 17 detect activation bit by integrated circuit detection chip；Formula SCR is helped in gas
In system, urea injecting quantity message is sent to gas by CAN communication circuit 21 and helped by the DePM＆NOx controllers MCU circuits 6
Urea pump.
Anti-static electricity interference circuit is by capacitance and the external electrostatic of resistance combined filter circuit for eliminating to the electrostatic interference of system.
Urea pipe heater circuit, urea box heating water valve circuit always heat relay circuit, SCR power supply relay electricity
Road controls the control that chip completes relay by integrated driving.
Imbibition pipeline heating detection circuit, injection line heating detection circuit, return line heating detection circuit, urea box
It heats water valve detection circuit and detection is realized by current detecting chip circuit.
A kind of in-use automotive tail gas clean-up DePM＆NOx system control methods, which is characterized in that include the following steps：
After step 1, vehicle or engine work, controller circuit board inputs electricity by rotating speed Acquisition Circuit 7, T15 signals
Road 8 obtains vehicle operating status information, by controlling SCR power relay circuits come so that entire DePM＆NOx system power supplies connect
Logical, system starts to work comprehensively；
After step 2, vehicle or engine run a period of time, when DePM＆NOx controller MCU circuits 6 pass through the front rows DOC
The front-seat warm input circuit 11 of warm input circuit 9, SCR, SCR heel row temperature input circuit 12 detect that SCR system meets operating condition
When, by NOx sensor before and after the activation of CAN communication circuit 21 SCR and NOx sensor information is obtained, and pass through related software meter
It calculates logical calculated and goes out urea solution injection quantity needed for SCR system, urea pump injection urine is helped without gas by the driving of PWM wave driving circuit 16
Plain water helps formula urea pump to spray urea water by the control gas of CAN communication circuit 21；
In all processes of step 3, vehicle or engine operation, DePM＆NOx controller MCU circuits 6 pass through the front rows DOC
Warm input circuit 9, pressure difference input circuit, the working condition for continuing to monitor DOC and POC, at the both ends DOC+POC, pressure difference is continued above
In the case of one threshold value, by alert, the front-seat warm input circuits 11 of SCR and by RS485 telecommunication circuits 19 or
Warning message is sent to vehicle-mounted monitoring apparatus by RS232 telecommunication circuits or CAN communication circuit 21；
In all processes of step 4, vehicle or engine operation, DePM＆NOx controller MCU circuits 6 pass through the front rows SCR
Warm input circuit 11, SCR heel row temperature input circuit 12 persistently detect temperature before and after SCR catalyst, and pass through CAN communication circuit 21
Persistently NOx sensor information before and after acquisition SCR, final detect and diagnose SCR system working condition in real time, when diagnosis to system hair
When raw failure, alert, and will be reported by RS485 telecommunication circuits 19 or RS232 telecommunication circuits or CAN communication circuit 21
Alert information is sent to vehicle-mounted monitoring apparatus；
In all processes of step 5, vehicle or engine operation, DePM＆NOx controller MCU circuits 6 are acquired by rotating speed
The front-seat warm input circuit 11 of the front-seat temperature input circuit 9 of circuit 7, T15 signal input circuits 8, DOC, pressure difference input circuit, SCR,
SCR heel row temperature input circuit 12, intake air temperature input circuit 13, admission pressure input circuit 14, NTC temperature collection circuits 15
Various kinds of sensors state is detected, when short circuit or short trouble occur for sensor, alert, and communicated by RS485
Warning message is sent to vehicle-mounted monitoring apparatus by circuit 19 or RS232 telecommunication circuits or CAN communication circuit 21；
In all processes of step 6, vehicle or engine operation, when outer atmospheric temperature is less than subzero 5 DEG C, DePM＆
NOx controller MCU circuits 6 are heated come control piper by urea pipe computer heating control and detection circuit 18 and detect each heating
Pipeline heating state, when fuser malfunction occurs, alert, and electricity is communicated by RS485 telecommunication circuits 19 or RS232
Warning message is sent to vehicle-mounted monitoring apparatus by road or CAN communication circuit 21.
A kind of in-use automotive tail gas clean-up DePM＆NOx system control methods, which is characterized in that include the following steps：
1., the detection of engine ignition key door T15 signal conductions, the initial conditions of this state also non-system；
2., judge whether T15 signals are connected, detection T15 signal voltages whether reach setting threshold values, if conducting if program
Into next step operation, otherwise system continuation is in most initial state；
3., by step 2. after, control SCR system power supply relay conducting, give whole system power supply；
4., by step 2. after, persistently detect T15 signals and whether there is, if detecting that 15 signals disconnect, control and be
System carries out step and 5. operates；
5., by step 4. after, control urea pump stop injection work；
6., by step 5. after, control urea pump carry out trepanning work；
7., by step 6. after, control SCR system voltage un relay power operations, system stops completely；
8., by step 3. after, exhaust temperature sensor is believed before the differential pressure pickup confidence at detection DOC and POC both ends, DOC
Exhaust temperature sensor information before breath, SCR judges whether the pressure difference at the both ends DOC and POC is more than the threshold values limited；If being less than valve
Value, then DOC and POC is normal operating conditions, if it exceeds then DOC and POC are blocked threshold values, carries out step in next step and 9. grasps
Make；
9., by step 8. after, provide the super threshold values warning message of differential pressure pickup, and logical by CAN communication or RS232
Warning message is passed to vehicle-mounted monitoring apparatus by letter or RS485 communications；
10., by step 3. after, detect SCR system state, obtain engine work when rotating speed, torque and waste gas stream
The information such as amount；And whether heated according to system status information decision-making system, it is heated if necessary, then in next step
Carry out stepIf you do not need to heating, then carry out step in next step
By step 1. after, heated if necessary, then carry out this step, to urea pipe, urea box, urine
Element pump etc. carries out heating defrosting operation；
Whether the heating defrosting such as detection urea pipe, urea box and urea pump is completed, if do not completed, continues stepIf completed, step is carried out
Judge whether SCR system reaches injection conditions, if reaching injection conditions, carries out stepIf do not reached
To injection conditions, then step is carried out 1.；
According to SCR system state, initial urea injecting quantity is calculated, and controls urea pump and is sprayed according to this amount
It penetrates；
Judge Vehicular exhaust NOx rows in conjunction with the numerical value that NOx sensor before and after SCR is fed back according to SCR system state
It puts and whether reaches target, if meeting target, continue according to stepIt carries out, if not meeting target, carries out step
StepUrea injecting quantity is readjusted to be walked after control urea pump is sprayed according to new emitted dose
Suddenly
Case study on implementation 2
Difference lies in the urea jet pump used in SCR system is that gas helps formula to this case study on implementation with case study on implementation 1
Urea pump helps formula urea pump to carry out urea spray and metering by gas.
Gas helps formula urea pump during control, when carrying out step 1, needs to carry out self-test to the state of pump, judge
When front pump is in original state, builds pressure condition, spray regime or purging state.It only is in purging state in urea pump,
DePM＆NOx system controllers by CAN communication circuit to urea pump emitted dose information when, urea pump could normal injection.
Gas helps formula urea pump during control, when carrying out step 5, can carry out the purging behaviour of urea pump itself automatically
Make, and return to original state after purging, and status information is informed that DePM＆NOx systems control by CAN communication circuit
Device.
The specific application example that the above is only the present invention, is not limited in any way protection scope of the present invention.All uses
Equivalent transformation or equivalent replacement and the technical solution formed, all fall within rights protection scope of the present invention.
Claims (14)
1. in-use automotive tail gas clean-up DePM＆NOx systems, it is characterised in that：Including DOC modules, POC modules, SCR modules, urea
Spray plus module, differential pressure pickup unit, exhaust temperature sensor unit, NOx sensor unit and DePM＆NOx controllers；The DOC
Module is mounted on the inflator of engine front row, and POC modules are connected to the rear side of DOC modules, and SCR modules are connected to POC modules
Rear side, urea spray plus module are connected between SCR modules and POC modules；
The differential pressure pickup unit is simultaneously in DOC modules and POC modules；Exhaust temperature sensor unit is separately mounted to
On the front end exhaust tube of DOC modules and the rear end exhaust tube of POC modules；NOx sensor unit is separately mounted to urea spray plus mould
On the exhaust tube of block front and on the exhaust tube of SCR modules rear end；
The urea spray plus module include urea pump, urea box and urea nozzle, and urea box is mounted on vehicle chassis, urea pump
It is connected on urea box, urea nozzle is connected in the outlet of urea pump.
2. in-use automotive tail gas clean-up DePM＆NOx systems according to claim 1, it is characterised in that：The DePM＆NOx controls
Device includes controller circuit board, cast aluminium alloy protection shell and 64 needle Wiring harness connectors；
Wherein, controller circuit board includes that power protecting circuit (4), DC24V turn DC5V circuits (5), DePM＆NOx controllers
The front-seat warm input circuit (9) of MCU circuits (6), rotating speed Acquisition Circuit (7), T15 signal input circuits (8), DOC, pressure difference input electricity
Road, the front-seat warm input circuits (11) of SCR, SCR heel row temperature input circuits (12), intake air temperature input circuit (13), admission pressure
Input circuit (14), NTC temperature collection circuits (15), PWM wave driving circuit (16), PWM wave driving testing circuit (17), urea
Pipeline heating controls and detection circuit (18), RS485 telecommunication circuits (19), RS232 telecommunication circuits, CAN communication circuit (21), urine
Plain liquid level temperature input circuit (22) and peripheral circuit (23)；
Wherein, other peripheral circuits (23) include program writing BDM circuits, anti-static electricity interference circuit；
Wherein, cast aluminium alloy protection shell includes cast aluminium alloy protection shell and polymeric membrane waterproof and breathable plug；
Wherein, urea pipe computer heating control and detection circuit (18) include urea pipe heater circuit, urea box heating water valve
Circuit always heats relay circuit, SCR power supply relays, imbibition pipeline heating detection circuit, injection line heating detection electricity
Road, return line heating detection circuit, urea box heat water valve detection circuit.
3. in-use automotive tail gas clean-up DePM＆NOx systems according to claim 2, it is characterised in that：The DePM＆NOx controls
Device MCU circuits (6) use Freescale MC9S12 series embedded scm processors, the power protecting circuit (4) to use
Self- recoverage patch insures and the progress reverse power connection protections such as TVS pipe, diode, DC24V turn DC5V circuits (5) and use LM2596 systems
Row chip completes conversion of the DC24V voltages to DC5V voltages.
4. in-use automotive tail gas clean-up DePM＆NOx systems according to claim 2, it is characterised in that：The rotating speed Acquisition Circuit
(7) the tacho-pulse information of resistor voltage divider circuit acquisition engine, the T15 signal input circuits (8) is used to pass through resistance point
Volt circuit acquires engine ignition signal key door T15 information.
5. in-use automotive tail gas clean-up DePM＆NOx systems according to claim 2, it is characterised in that：The front-seat temperature of the DOC is defeated
Enter the front-seat warm input circuit (11) of circuit (9), SCR, SCR heel row temperature input circuits (12), intake air temperature input circuit (13),
NTC temperature collection circuits (15), urea level temperature input circuit (22) use resistor voltage divider circuit acquisition system phase inductive sensing
Device information.
6. in-use automotive tail gas clean-up DePM＆NOx systems according to claim 2, it is characterised in that：The admission pressure input
Circuit (13), pressure difference input circuit directly adopt circuit acquisition respective sensor information by using voltage.
7. in-use automotive tail gas clean-up DePM＆NOx systems according to claim 2, it is characterised in that：The CAN communication circuit
(21) by acquiring NOx sensor Receive message system NOx sensor information in CAN bus.
8. in-use automotive tail gas clean-up DePM＆NOx systems according to claim 2, it is characterised in that：The RS485 communications electricity
Road (19), RS232 telecommunication circuits, CAN communication circuit (21) pass through corresponding communication line and vehicle-mounted monitoring apparatus information exchange.
9. in-use automotive tail gas clean-up DePM＆NOx systems according to claim 2, it is characterised in that：Airless SCR systems
In system, the PWM wave driving circuit (16) drives the urea pump controlled by pwm signal and nozzle, PWM by high-power MOS tube
Wave driving testing circuit (17) detects activation bit by integrated circuit detection chip；It is helped in formula SCR system in gas, it is described
Urea injecting quantity message is sent to gas by CAN communication circuit (21) and helps urea pump by DePM＆NOx controller MCU circuits (6).
10. in-use automotive tail gas clean-up DePM＆NOx systems according to claim 2, it is characterised in that：The anti-static electricity interference
Circuit is by capacitance and the external electrostatic of resistance combined filter circuit for eliminating to the electrostatic interference of system.
11. in-use automotive tail gas clean-up DePM＆NOx systems according to claim 2, it is characterised in that：The urea pipe adds
Heater circuit, urea box heating water valve circuit, always heating relay circuit, SCR power relay circuits are controlled by integrated driving
Chip completes the control of relay.
12. in-use automotive tail gas clean-up DePM＆NOx systems according to claim 2, it is characterised in that：The imbibition pipeline adds
Hot detection circuit, injection line heating detection circuit, return line heating detection circuit, urea box heating water valve detection circuit are logical
Overcurrent detection chip circuit realizes detection.
13. according to claim 1-12 any one of them in-use automotive tail gas clean-up DePM＆NOx system control methods, feature
It is, includes the following steps：
After step 1, vehicle or engine work, controller circuit board passes through rotating speed Acquisition Circuit (7), T15 signal input circuits
(8) vehicle operating status information is obtained, by controlling SCR power relay circuits come so that entire DePM＆NOx system power supplies connect
Logical, system starts to work comprehensively；
After step 2, vehicle or engine run a period of time, when DePM＆NOx controller MCU circuits (6) pass through the front-seat temperature of DOC
The front-seat warm input circuit (11) of input circuit (9), SCR, SCR heel row temperature input circuits (12) detect that SCR system meets work
When condition, by NOx sensor before and after CAN communication circuit (21) activation SCR and NOx sensor information is obtained, and pass through correlation
Software calculating logic calculates urea solution injection quantity needed for SCR system, is driven by PWM wave driving circuit (16) and helps urea without gas
Pump injection urea water helps formula urea pump to spray urea water by CAN communication circuit (21) control gas；
In all processes of step 3, vehicle or engine operation, DePM＆NOx controller MCU circuits (6) pass through the front-seat temperature of DOC
Input circuit (9), pressure difference input circuit, the working condition for continuing to monitor DOC and POC, at the both ends DOC+POC, pressure difference is continued above
In the case of one threshold value, by alert, the front-seat warm input circuits (11) of SCR simultaneously pass through RS485 telecommunication circuits (19)
Or warning message is sent to vehicle-mounted monitoring apparatus by RS232 telecommunication circuits or CAN communication circuit (21)；
In all processes of step 4, vehicle or engine operation, DePM＆NOx controller MCU circuits (6) pass through the front-seat temperature of SCR
Input circuit (11), SCR heel row temperature input circuits (12) persistently detect temperature before and after SCR catalyst, and pass through CAN communication circuit
(21) NOx sensor information before and after SCR is persistently obtained, final detect and diagnose SCR system working condition in real time, when diagnosis is to being
When system breaks down, alert, and pass through RS485 telecommunication circuits (19) or RS232 telecommunication circuits or CAN communication circuit
(21) warning message is sent to vehicle-mounted monitoring apparatus；
In all processes of step 5, vehicle or engine operation, DePM＆NOx controller MCU circuits (6) acquire electricity by rotating speed
Road (7), T15 signal input circuits (8), the front-seat warm input circuits (9) of DOC, pressure difference input circuit, the front-seat warm input circuits of SCR
(11), SCR heel row temperature input circuit (12), intake air temperature input circuit (13), admission pressure input circuit (14), NTC temperature
Acquisition Circuit (15) detects various kinds of sensors state, when short circuit or short trouble occur for sensor, alert, and
Warning message is sent to vehicle-mounted monitoring by RS485 telecommunication circuits (19) or RS232 telecommunication circuits or CAN communication circuit (21)
Device；
In all processes of step 6, vehicle or engine operation, when outer atmospheric temperature is less than subzero 5 DEG C, DePM＆NOx controls
Device MCU circuits (6) processed are heated come control piper by urea pipe computer heating control and detection circuit (18) and detect each heating
Pipeline heating state, when fuser malfunction occurs, alert, and communicated by RS485 telecommunication circuits (19) or RS232
Warning message is sent to vehicle-mounted monitoring apparatus by circuit or CAN communication circuit (21).
14. in-use automotive tail gas clean-up DePM＆NOx system control methods according to claim 13, which is characterized in that including
Following steps：
1., the detection of engine ignition key door T15 signal conductions, the initial conditions of this state also non-system；
2., judge whether T15 signals are connected, detection T15 signal voltages whether reach setting threshold values, if conducting if program enter
Next step operation, otherwise system continuation is in most initial state；
3., by step 2. after, control SCR system power supply relay conducting, give whole system power supply；
4., by step 2. after, persistently detect T15 signals whether there is, if detect 15 signals disconnect, control system into
5. row step operates；
5., by step 4. after, control urea pump stop injection work；
6., by step 5. after, control urea pump carry out trepanning work；
7., by step 6. after, control SCR system voltage un relay power operations, system stops completely；
8., by step 3. after, exhaust temperature sensor information before the differential pressure pickup confidence at detection DOC and POC both ends, DOC,
Exhaust temperature sensor information before SCR judges whether the pressure difference at the both ends DOC and POC is more than the threshold values limited；If being less than threshold values,
Then DOC and POC is normal operating conditions, if it exceeds then DOC and POC are blocked threshold values, carries out step in next step and 9. operates；
9., by step 8. after, provide the super threshold values warning message of differential pressure pickup, and by CAN communication or RS232 communications or
Warning message is passed to vehicle-mounted monitoring apparatus by RS485 communications；
10., by step 3. after, detect SCR system state, obtain rotating speed, torque and exhaust gas flow etc. when engine work
Information；And whether heated according to system status information decision-making system, it is heated, is then carried out in next step if necessary
StepIf you do not need to heating, then carry out step in next step
By step 1. after, heated if necessary, then carry out this step, to urea pipe, urea box, urea pump
It is operated etc. heating defrosting is carried out；
Whether the heating defrosting such as detection urea pipe, urea box and urea pump is completed, if do not completed, continues step
If completed, step is carried out
Judge whether SCR system reaches injection conditions, if reaching injection conditions, carries out stepIf not up to sprayed
Condition is penetrated, then carries out step 1.；
According to SCR system state, initial urea injecting quantity is calculated, and controls urea pump and is sprayed according to this amount；
Judge that Vehicular exhaust NOx emission is in conjunction with the numerical value that NOx sensor before and after SCR is fed back according to SCR system state
It is no to reach target, if meeting target, continue according to stepIt carries out, if not meeting target, carries out step
StepIt readjusts urea injecting quantity and carries out step after control urea pump is sprayed according to new emitted dose
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