CN208347870U - In-use automotive tail gas clean-up DePM&NOx system - Google Patents
In-use automotive tail gas clean-up DePM&NOx system Download PDFInfo
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- CN208347870U CN208347870U CN201820385086.8U CN201820385086U CN208347870U CN 208347870 U CN208347870 U CN 208347870U CN 201820385086 U CN201820385086 U CN 201820385086U CN 208347870 U CN208347870 U CN 208347870U
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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
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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
- 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
Abstract
The utility model discloses a kind of in-use automotive tail gas clean-up DePM&NOx systems, including the spray of DOC module, POC module, SCR module, urea plus module, differential pressure pickup unit, exhaust temperature sensor unit, NOx sensor unit and DePM&NOx controller；DOC module is mounted on the inflator of engine front row, and POC module is connected to the rear side of DOC module, and SCR module is connected to the rear side of POC module, and urea spray plus module are connected between SCR module and POC module.Above-mentioned in-use automotive tail gas clean-up DePM&NOx system uses the form of DOC+POC+SCR synchronously control, 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 system
System.
Background technique
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 filter) 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, installing the PM substance that DPF device is merely able in filtering tail gas additional, and PM is
A part of the pollutant of diesel automobile in use exhaust emissions, there are also more NOx (nitrogen oxides) in exhaust gas from diesel vehicle, NOx is
An important factor for causing the polluting weathers such as haze.2, in-use automotive installs DPF device additional, due to not doing when engine and vehicle factory
Dpf regeneration calibration, be easy to cause DPF carbon deposit excessively to block, and causes engine system exhaust back pressure to increase, and then lead to engine
Burn the application problems such as deterioration, oil consumption increase, engine power output decrease.3, in-use automotive installs DPF system additional and needs frequently
Deashing maintenance is carried out, influences the just common vehicle of car owner, and application cost is high, overall economic effect is general.
Summary of the invention
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 system, using the form of DOC+POC+SCR synchronously control, while drop except in diesel engine vent gas most of PM and
NOx efficiently solves the problems, such as exhaust pollution of diesel engines object PM and NOx synchronous purification, and overall application is at low cost, economic effect
It is good.
In order to achieve the above objectives, the technical solution adopted by the present invention is that: a kind of in-use automotive tail gas clean-up DePM&NOx system
System, including the spray of DOC module, POC module, SCR module, urea plus module, differential pressure pickup unit, exhaust temperature sensor unit, NOx
Sensor unit and DePM&NOx controller；The DOC module is mounted on the inflator of engine front row, and POC module is connected to
The rear side of DOC module, SCR module are connected to the rear side of POC module, urea spray plus module be connected to SCR module and POC module it
Between；
The differential pressure pickup unit is mounted in DOC module and POC module simultaneously；Exhaust temperature sensor unit is installed respectively
On the front end exhaust tube of DOC module and the rear end exhaust tube of POC module；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 module 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 controller includes 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 circuit, DePM&NOx controller
The front-seat temperature of MCU (Microprogrammed Control Unit) circuit, revolving speed Acquisition Circuit, T15 signal input circuit, DOC
The front-seat warm input circuit of input circuit, pressure difference input circuit, SCR, SCR heel row temperature input circuit, intake air temperature input circuit,
Admission pressure input circuit, NTC temperature collection circuit, PWM wave driving circuit, PWM wave driving testing circuit, urea pipe add
Thermal control and detection circuit, RS485 telecommunication circuit, RS232 telecommunication circuit, CAN communication circuit, urea level temperature input electricity
Other peripheral circuits in road etc.；
Other peripheral circuits include program writing BDM circuit, 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 relay, 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 controller MCU circuit is handled using Freescale MC9S12 series embedded scm
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 circuit completes the conversion of DC24V voltage to DC5V voltage using LM2596 family chip.
Tacho-pulse information of the revolving speed Acquisition Circuit using 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 circuit of the DOC, the front-seat warm input circuit of SCR, SCR heel row temperature input circuit, intake air temperature are defeated
Enter circuit, NTC temperature collection circuit, urea level temperature input circuit using 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 passes through NOx sensor Receive message system NOx sensor information in acquisition CAN bus.
The RS485 telecommunication circuit, RS232 telecommunication circuit, 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 by PWM signal control
The urea pump and nozzle of system, PWM wave driving testing circuit pass through integrated circuit detection chip detection activation bit；Formula is helped in gas
In SCR system, urea injecting quantity message is sent to urea by CAN communication circuit by the DePM&NOx controller MCU circuit
Pump.
The anti-static electricity interference circuit eliminates external electrostatic to the electrostatic of system by capacitor and resistance combination filter circuit
Interference.
The urea pipe heater circuit, always heats relay circuit, SCR power supply 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 realizes detection by current detecting chip circuit.
A kind of in-use automotive tail gas clean-up DePM&NOx system control method, which comprises the following steps:
After step 1, vehicle or engine operation, controller circuit board passes through revolving speed Acquisition Circuit, T15 signal input circuit
Vehicle operating status information is obtained, by control SCR power relay circuit come so that entire DePM&NOx system power supply connects
Logical, system starts to work comprehensively；
After step 2, vehicle or engine run a period of time, when DePM&NOx controller MCU circuit passes through the front row DOC
When the front-seat warm input circuit of warm input circuit, SCR, SCR heel row temperature input circuit detect that SCR system meets operating condition, lead to
It crosses CAN communication Circuit activation SCR front and back NOx sensor and obtains NOx sensor information, and pass through related software calculating logic
Urea solution injection quantity needed for SCR system is calculated, helps urea pump to spray urea water or lead to without gas by the driving of PWM wave driving circuit
Crossing 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 circuit passes through the front row DOC
Warm 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
In the case where one threshold value, by alert, the front-seat warm input circuit of SCR is simultaneously logical by RS485 telecommunication circuit or RS232
Believe that 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 circuit passes through the front-seat temperature of SCR
Input circuit, SCR heel row temperature input circuit persistently detect temperature before and after SCR catalyst, and are persistently obtained by CAN communication circuit
NOx sensor information before and after SCR, final real-time detection and diagnosis SCR working state of system, when system jam is arrived in diagnosis
When, alert, and sent warning message by RS485 telecommunication circuit or RS232 telecommunication circuit or CAN communication circuit
To vehicle-mounted monitoring apparatus；
In all processes of step 5, vehicle or engine operation, DePM&NOx controller MCU circuit is acquired by revolving speed
After the front-seat warm input circuit of circuit, T15 signal input circuit, DOC, pressure difference input circuit, the front-seat warm input circuit of SCR, SCR
Warm input circuit, intake air temperature input circuit, admission pressure input circuit, NTC temperature collection circuit are arranged to detect all kinds of sensings
Device state, when short circuit or short trouble occur for sensor, alert, and it is logical by RS485 telecommunication circuit or RS232
Believe that 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 lower than subzero 5 DEG C, DePM&
NOx controller MCU circuit is heated come control piper by urea pipe computer heating control and detection circuit and detects each heating tube
Road heated condition, when fuser malfunction occurs, alert, and pass through RS485 telecommunication circuit or RS232 telecommunication circuit
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 method, which comprises the following steps:
1., the detection of engine ignition key door T15 signal conduction, the initial conditions of this state also non-system；
2., judge whether T15 signal is connected, detection T15 signal voltage whether reach setting threshold, if conducting if program
Into next step operation, otherwise system continues 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 detecting T15 signal whether there is, if detecting that 15 signals disconnect, controls and is
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 aperture work；
7., by step 6. after, control SCR system voltage un relay power operation, system stops completely；
8., by step 3. after, exhaust temperature sensor is believed before detecting the differential pressure pickup confidence at the both ends DOC and POC, DOC
Breath, exhaust temperature sensor information before SCR, judge the both ends DOC and POC pressure difference whether be more than restriction threshold；If being less than fault
Value, then DOC and POC is normal operating conditions, if it exceeds then DOC and POC are blocked threshold, carries out step in next step and 9. grasps
Make；
9., by step 8. after, provide the super threshold warning message of differential pressure pickup, and lead to by CAN communication or RS232
Letter or RS485, which are communicated, passes to vehicle-mounted monitoring apparatus for warning message；
10., by step 3. after, detect SCR system state, obtain engine operation when revolving 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 not
Reach injection conditions, 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
It penetrates；
According to SCR system state, in conjunction with the numerical value that NOx sensor before and after SCR is fed back, judge that Vehicular exhaust NOx is arranged
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 the amount of injection
Suddenly
Due to the application of the above technical scheme, compared with the prior art, the invention has the following advantages:
It using the form of DOC+POC+SCR synchronously control, 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 the SOF ingredient removed 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 effect, by carbon deposit of the NO2 oxidation filtering on POC, the PM except in tail gas about 6% is effectively filtered and drops to realize.
Compared to the wall-flow type carrier used with DPF, system back pressure is substantially reduced, 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 does not need to 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.
Detailed description of the invention
Technical scheme of the present invention is further explained with reference to the accompanying drawing:
Attached drawing 1 is the arrangement relation schematic diagram of in-use automotive tail gas clean-up DePM&NOx system of the present invention；
Attached drawing 2 is the working principle of the invention schematic diagram；
Attached drawing 3 is control process schematic diagram of the invention.
Specific embodiment
The present invention is described in further detail combined with specific embodiments below.
Embodiment 1
A kind of in-use automotive tail gas clean-up DePM&NOx system as shown in Figure 1 to Figure 3, including DOC module, POC module,
SCR module, urea spray plus module, differential pressure pickup unit, exhaust temperature sensor unit, NOx sensor unit and DePM&NOx control
Device processed；The DOC module is mounted on the inflator of engine front row, and POC module is connected to the rear side of DOC module, and SCR module connects
The rear side in POC module is connect, urea spray plus module are connected between SCR module and POC module；
The differential pressure pickup unit is mounted in DOC module and POC module simultaneously；Exhaust temperature sensor unit is installed respectively
On the front end exhaust tube of DOC module and the rear end exhaust tube of POC module；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 module 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 controller 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 circuit 5, DePM&NOx controller
Before the front-seat warm input circuit 9 of MCU circuit 6, revolving speed Acquisition Circuit 7, T15 signal input circuit 8, DOC, pressure difference input circuit, SCR
Arrange warm input circuit 11, 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 circuit 19, RS232 telecommunication circuit, CAN communication circuit 21, urea level temperature input circuit 22 and periphery electricity
Road 23；
Wherein, other peripheral circuits 23 include program writing BDM circuit, 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 relay, 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 circuit 6 uses Freescale MC9S12 series embedded scm processor, 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 circuit
5 complete the conversion of DC24V voltage to DC5V voltage using LM2596 family chip.
Revolving speed Acquisition Circuit 7 acquires the tacho-pulse information of engine using resistor voltage divider circuit, and the T15 signal is defeated
Enter circuit 8 and engine ignition signal key door T15 information is acquired by resistor voltage divider circuit.
The front-seat warm input circuit 9 of DOC, the front-seat warm input circuit 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 circuit 15, urea level temperature input circuit 22
Sensor information.
Admission pressure input circuit 14, pressure difference input circuit directly adopt circuit acquisition respective sensor letter by using voltage
Breath.
CAN communication circuit 21 passes through NOx sensor Receive message system NOx sensor information in acquisition CAN bus.
RS485 telecommunication circuit 19, RS232 telecommunication circuit, 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 driven by high-power MOS tube and is controlled by PWM signal
Urea pump and nozzle, PWM wave driving testing circuit 17 by integrated circuit detection chip detect activation bit；Formula is helped in gas
In SCR system, urea injecting quantity message is sent to by the DePM&NOx controller MCU circuit 6 by CAN telecommunication circuit 21
Gas helps urea pump.
Anti-static electricity interference circuit eliminates external electrostatic to the electrostatic interference of system by capacitor and resistance combination filter circuit.
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 heat 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 method, which comprises the following steps:
After step 1, vehicle or engine operation, controller circuit board passes through revolving speed Acquisition Circuit 7, T15 signal input electricity
Road 8 obtains vehicle operating status information, by control SCR power relay circuit come so that entire DePM&NOx system power supply connects
Logical, system starts to work comprehensively；
After step 2, vehicle or engine run a period of time, when DePM&NOx controller MCU circuit 6 passes through the front row 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, SCR front and back NOx sensor is activated by CAN communication circuit 21 and obtains NOx sensor information, and passes through related software meter
It calculates logic calculation 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 telecommunication circuit 21；
In all processes of step 3, vehicle or engine operation, DePM&NOx controller MCU circuit 6 passes through the front row 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 where one threshold value, by alert, the front-seat warm input circuit 11 of SCR and by RS485 telecommunication circuit 19 or
Warning message is sent to vehicle-mounted monitoring apparatus by RS232 telecommunication circuit or CAN communication circuit 21；
In all processes of step 4, vehicle or engine operation, DePM&NOx controller MCU circuit 6 passes through the front row 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
The front and back SCR NOx sensor information, final real-time detection and diagnosis SCR system working condition are persistently obtained, when diagnosis to system hair
When raw failure, alert, and will be reported by RS485 telecommunication circuit 19 or RS232 telecommunication circuit 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 circuit 6 is acquired by revolving speed
The front-seat warm input circuit 11 of the front-seat temperature input circuit 9 of circuit 7, T15 signal input circuit 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 circuit 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 circuit or CAN communication circuit 21；
In all processes of step 6, vehicle or engine operation, when outer atmospheric temperature is lower than subzero 5 DEG C, DePM&
NOx controller MCU circuit 6 is heated come control piper by urea pipe computer heating control and detection circuit 18 and detects each heating
Pipeline heating state, when fuser malfunction occurs, alert, and pass through RS485 telecommunication circuit 19 or RS232 communication electricity
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 method, which comprises the following steps:
1., the detection of engine ignition key door T15 signal conduction, the initial conditions of this state also non-system；
2., judge whether T15 signal is connected, detection T15 signal voltage whether reach setting threshold, if conducting if program
Into next step operation, otherwise system continues 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 detecting T15 signal whether there is, if detecting that 15 signals disconnect, controls and is
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 aperture work；
7., by step 6. after, control SCR system voltage un relay power operation, system stops completely；
8., by step 3. after, exhaust temperature sensor is believed before detecting the differential pressure pickup confidence at the both ends DOC and POC, DOC
Breath, exhaust temperature sensor information before SCR, judge the both ends DOC and POC pressure difference whether be more than restriction threshold；If being less than fault
Value, then DOC and POC is normal operating conditions, if it exceeds then DOC and POC are blocked threshold, carries out step in next step and 9. grasps
Make；
9., by step 8. after, provide the super threshold warning message of differential pressure pickup, and lead to by CAN communication or RS232
Letter or RS485, which are communicated, passes to vehicle-mounted monitoring apparatus for warning message；
10., by step 3. after, detect SCR system state, obtain engine operation when revolving 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 not
Reach injection conditions, 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
It penetrates；
According to SCR system state, in conjunction with the numerical value that NOx sensor before and after SCR is fed back, judge that Vehicular exhaust NOx is arranged
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 the amount of injection
Suddenly
Case study on implementation 2
The difference of this case study on implementation and case study on implementation 1 is that the urea jet pump used in SCR system is that gas helps formula
Urea pump helps formula urea pump to carry out urea spray and metering by gas.
Gas helps formula urea pump in control process, when carrying out step 1, needs to carry out self-test, judgement to the state of pump
When front pump is in original state, builds pressure condition, spray regime or purging state.It only is in purging state in urea pump,
When DePM&NOx system controller passes through CAN communication circuit to urea pump the amount of injection information, urea pump could normal injection.
Gas helps formula urea pump in control process, 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 into the control of DePM&NOx system by CAN communication circuit
Device.
The above is only specific application examples of the invention, are not limited in any way to 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 (11)
1. in-use automotive tail gas clean-up DePM&NOx system, it is characterised in that: including DOC module, POC module, SCR module, urea
Spray plus module, differential pressure pickup unit, exhaust temperature sensor unit, NOx sensor unit and DePM&NOx controller；The DOC
Module is mounted on the inflator of engine front row, and POC module is connected to the rear side of DOC module, and SCR module is connected to POC module
Rear side, urea spray plus module are connected between SCR module and POC module；
The differential pressure pickup unit is mounted in DOC module and POC module simultaneously；Exhaust temperature sensor unit is separately mounted to
On the front end exhaust tube of DOC module and the rear end exhaust tube of POC module；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 module 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 system according to claim 1, it is characterised in that: the DePM&NOx control
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 circuit (5), DePM&NOx controller
The front-seat warm input circuit (9) of MCU circuit (6), revolving speed Acquisition Circuit (7), T15 signal input circuit (8), DOC, pressure difference input electricity
Road, the front-seat warm input circuit (11) of SCR, 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
Pipeline heating control and detection circuit (18), RS485 telecommunication circuit (19), RS232 telecommunication circuit, CAN communication circuit (21), urine
Plain liquid level temperature input circuit (22) and peripheral circuit (23)；
Wherein, peripheral circuit (23) includes program writing BDM circuit, 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 relay, 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 system according to claim 2, it is characterised in that: the DePM&NOx control
Device MCU circuit (6) uses Freescale MC9S12 series embedded scm processor, and the power protecting circuit (4) uses
The insurance of self- recoverage patch and TVS pipe, diode carry out reverse power connection protection, and DC24V turns DC5V circuit (5) using LM2596 series
Chip completes the conversion of DC24V voltage to DC5V voltage.
4. in-use automotive tail gas clean-up DePM&NOx system according to claim 2, it is characterised in that: the revolving speed Acquisition Circuit
(7) using the tacho-pulse information of resistor voltage divider circuit acquisition engine, the T15 signal input circuit (8) passes through resistance point
Volt circuit acquires engine ignition signal key door T15 information.
5. in-use automotive tail gas clean-up DePM&NOx system 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 circuit (12), intake air temperature input circuit (13),
NTC temperature collection circuit (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 system according to claim 2, it is characterised in that: the admission pressure input
Circuit (14), pressure difference input circuit directly adopt circuit acquisition respective sensor information by using voltage.
7. in-use automotive tail gas clean-up DePM&NOx system according to claim 2, it is characterised in that: the CAN communication circuit
(21) pass through NOx sensor Receive message system NOx sensor information in acquisition CAN bus.
8. in-use automotive tail gas clean-up DePM&NOx system according to claim 2, it is characterised in that: the RS485 communication electricity
Road (19), RS232 telecommunication circuit, 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 system according to claim 2, it is characterised in that: the anti-static electricity interference electricity
Road external electrostatic is eliminated to the electrostatic interference of system by capacitor and resistance combination filter circuit.
10. in-use automotive tail gas clean-up DePM&NOx system 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 circuit pass through integrated driving and control
The control of chip completion relay.
11. in-use automotive tail gas clean-up DePM&NOx system 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.
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| CN201820385086.8U CN208347870U (en) | 2018-03-21 | 2018-03-21 | In-use automotive tail gas clean-up DePM&NOx system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108425723A (en) * | 2018-03-21 | 2018-08-21 | 南京依柯卡特排放技术股份有限公司 | In-use automotive tail gas clean-up DePM ＆ NOx systems and control method |
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2018
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108425723A (en) * | 2018-03-21 | 2018-08-21 | 南京依柯卡特排放技术股份有限公司 | In-use automotive tail gas clean-up DePM ＆ NOx systems and control method |
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