CN106640294A - Dual-pressure-transducer type gas-driven urea injection system and control method - Google Patents
Dual-pressure-transducer type gas-driven urea injection system and control method Download PDFInfo
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- CN106640294A CN106640294A CN201710049760.5A CN201710049760A CN106640294A CN 106640294 A CN106640294 A CN 106640294A CN 201710049760 A CN201710049760 A CN 201710049760A CN 106640294 A CN106640294 A CN 106640294A
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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
- F01N3/206—Adding periodically or continuously substances to exhaust gases for promoting purification, e.g. catalytic material in liquid form, NOx reducing agents
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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
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
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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
- 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
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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
- F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
- F01N3/2013—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using electric or magnetic heating means
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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]
- F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
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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
- F01N9/00—Electrical control of exhaust gas treating apparatus
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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
- F01N2550/00—Monitoring or diagnosing the deterioration of exhaust systems
- F01N2550/05—Systems for adding substances into exhaust
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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
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/08—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being a pressure sensor
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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
- F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
- F01N2570/12—Hydrocarbons
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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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
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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
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/04—Methods of control or diagnosing
- F01N2900/0416—Methods of control or diagnosing using the state of a sensor, e.g. of an exhaust gas sensor
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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
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/18—Parameters used for exhaust control or diagnosing said parameters being related to the system for adding a substance into the exhaust
- F01N2900/1806—Properties of reducing agent or dosing system
- F01N2900/1808—Pressure
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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
- Y02T10/12—Improving ICE efficiencies
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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
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- 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)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The invention discloses a dual-pressure-transducer type gas-driven urea injection system and a control method. The dual-pressure-transducer type gas-driven urea injection system comprises a urea tank, a urea filter, a gas source, a urea nozzle and an electronic control unit ECU, wherein an intake valve and an exhaust valve are arranged on the urea tank, and a gas circuit pressure transducer is arranged in the urea tank; the urea filter is connected with the urea tank and the urea nozzle; a liquid circuit pressure transducer connected with the electronic control unit ECU is arranged between the urea filter and the urea nozzle; and the liquid circuit pressure transducer comprises a control chip, a transducer connector, a heat conducting strip and an electrical heating urea pipe. According to dual-pressure-transducer type gas-driven urea injection system, the gas circuit pressure transducer capable of detecting the system pressure and the liquid circuit pressure transducer capable of detecting the injection pressure are included, the ECU can perform comprehensive analysis on signals of the gas circuit pressure transducer and the liquid circuit pressure transducer, and accordingly, accurate control of the urea nozzle, accurate judgment on the working state of the urea nozzle and precise regular maintenance of the urea filter according to resistance are all achieved.
Description
Technical field
The present invention relates to diesel engine vent gas post processing field, particularly a kind of dual pressure sensor formula gas drive urea injection system
System and control method.
Background technology
With the enforcement of the Abgasgesetz of commercial car state IV, car load must install nitrogen oxides additional（NOx）Exhaust aftertreatment devices.
The medium and heavy-duty engines of current China, generally using SCR（SCR）Technology path, will standard vehicle
It is ejected in exhaust with aqueous solution of urea, the ammonia produced using its decomposition（NH3）SCR is carried out to NOx, it is raw
Into harmless nitrogen（N2）And water（H2O）.
Patent document 1（CN201010513101.0）In describe a kind of pneumatic single-urea box full-deflating emptying pipeline
SCR urea systems, arrange urea solution filler, temperature and liquid level sensor, urea box pressure sensor, heating above urea box
Pipeline, compressed gas enter compressed gas pipeline I and compressed gas pipeline III, are deflated to compressed gas magnetic valve B, compressed gas
Control valve A, compressed gas control valve B, compressed gas control valve C are located at the compressed air hose between automobile air cylinder and urea box
Lu Zhong, urea solution cleaner is located in the urea solution feeding pipe between urea box and urea fluid injector；ECU signals control pressure
Contracting gas control valve A, compressed gas control valve B, compressed gas control tri- magnetic valves of valve C and urea fluid injector.
Patent document 2（CN201020661310.5）In describe a kind of cutoff hole of pneumatic-type single urea box deflation emptying formula
Urea system, compressed gas magnetic valve is located in the compressed air line between automobile air cylinder and urea box, and cutoff hole is located at
In urea pipe between compressed gas magnetic valve and internal or external urea cleaner and urea injector, internal or external urine
Plain liquid cleaner is located in the urea solution feeding pipe between urea box and urea fluid injector；ECU control signals A, ECU are controlled
Signal B, ECU control signal C control compressed gas control valve and compressed gas magnetic valve and urea fluid injector.
Patent document 3（CN201010513102.5）Report a kind of non-deflation emptying pipeline SCR of pneumatic-type single urea box
Urea system, by urea solution filler, urea box, water heating pipeline, urea liquid temp and liquid level signal, atmospheric temperature signal,
SCR inlet temperature signal, NOx signals, urea box pressure signal, ECU control signals are divided into signal I, signal II, signal III, urine
Plain injector, urea injector cooling line, urea box heat control valve, compressed gas control valve A and compressed gas magnetic valve
B, compressed gas pipeline a and compressed gas pipeline b, urea woven hose, urea solution cleaner composition.
For above-mentioned patent document 1, patent document 2 and SCR urea systems disclosed in patent document 3, respectively describe
The related notion of gas drive system, and airline pressure sensor is additionally arranged in urea box, for the gas pressure in urea box
Power is detected.
However, ECU cannot be monitored to the blockage of urea cleaner, more such case cannot effectively be protected
Shield.When urea filter restriction, urea injection pressure is reduced, and is further resulted in the reduction of urea nozzle emitted dose, spraying and is deteriorated,
Cause to discharge in exceeded, after-treatment system and crystallize.
Further, ECU also cannot be judged urea nozzle working condition, such as when urea nozzle is blocked, ECU
System operation irregularity can only be judged, cause system to report an error out-focus, increase maintenance investigation difficulty.
The content of the invention
The technical problem to be solved in the present invention is to be directed to above-mentioned the deficiencies in the prior art, and provides a kind of dual pressure sensor
Formula gas drive urea injection system, the dual pressure sensor formula gas drive urea injection system has system pressure can be detected
Airline pressure sensor and the fluid path pressure sensor that can be detected to injection pressure, ECU is by airline pressure sensor
With the comprehensive analysis of fluid path pressure sensor signal, realize to the precision controlling of urea nozzle, to urea nozzle working condition
It is accurate to judge and urea cleaner is pressed the maintenance of resistance accurate timing.
To solve above-mentioned technical problem, the technical solution used in the present invention is：
A kind of dual pressure sensor formula gas drive urea injection system, including urea tank, urea cleaner, source of the gas, urea nozzle and
Controller ECU；Intake valve and air bleeding valve are provided with urea tank, the inlet end of intake valve is connected with source of the gas；In urea tank also
It is provided with airline pressure sensor；The input of urea cleaner is connected with urea tank, output end and the urine of urea cleaner
Plain nozzle is connected；Intake valve, air bleeding valve, airline pressure sensor and urea nozzle are connected with controller ECU；In urea
The fluid path pressure sensor being connected with controller ECU is provided between cleaner and urea nozzle；The fluid path pressure sensor
Including control chip, sensor connector, conducting strip and electrical heating urea tube.
Sensor connector is fixedly installed on the two ends of control chip, and in each sensor connector fluid course is provided with,
The internal face of each fluid course is provided with conducting strip；The periphery of each sensor connector is set with electrical heating urea tube.
Contact with the urea periphery of part of the control chip is coated with freeze protected rubber.
Each sensor connector is using the quick connector of SAEJ2044 standards.
The voltage endurance capability of urea tank is more than 12bar.
The present invention also provides a kind of control method of dual pressure sensor formula gas drive urea injection system, this pair of pressure sensing
The control method of device formula gas drive urea injection system has the airline pressure sensor that can be detected to system pressure right with energy
The fluid path pressure sensor that injection pressure is detected, ECU is by airline pressure sensor and fluid path pressure sensor signal
Comprehensive analysis, realize the precision controlling to urea nozzle, the accurate judgement to urea nozzle working condition and to urea filter
Clear device presses the maintenance of resistance accurate timing.
A kind of control method of dual pressure sensor formula gas drive urea injection system, airline pressure sensor is in urea tank
Pressure is detected that fluid path pressure sensor is detected to the injection pressure of urea nozzle；Controller ECU is by gas circuit pressure
The comprehensive analysis of force snesor and fluid path pressure sensor detection data, can realize the control to urea injection system pressure；Urine
Plain spraying system Stress control comprises the steps.
Step 11, urea tank Stress control：Controller ECU is made by the control to intake valve and exhaust valve opening opportunity
Gas pressure in urea tank is maintained within the scope of Pa ~ Pb.
Step 12, the control of urea nozzle parameter：Urea nozzle is opened according to the injection frequency of 1Hz, and controller ECU is by control
Urea nozzle processed unlatching duration T1 control urea injecting quantities per second.
Step 13, urea nozzle parameter control when gas-liquid road pressure differential is abnormal：When urea nozzle is opened, urea fluid path
Pressure drop, therefore fluid path pressure sensor signal is less than airline pressure sensor signal, gas-liquid road pressure differential is assumed to be Pd, and Pe is
The higher limit of gas-liquid road pressure differential during urea normal injection；Work as Pd>Pe, is to ensure that vehicle is normally used during urea abnormal injection,
Urea nozzle parameter is adjusted into as follows control.
Step 131：Work as Pe<Pd<During Pf, the injection duration T2 per second of urea nozzle is adjusted to T2=k* by controller ECU
T1, wherein, k is injection time scale modification coefficient, k=1+Pd/（Pa+Pb）/ 2, Pf span is 1.5Pe ~ 2Pe.
Step 132：Work as Pf<Pd<During Pg, when urea nozzle injection frequency is improved to 2Hz by 1Hz, gas-liquid road pressure is made
Difference Pd declines；Wherein, Pg spans are 2Pe ~ 3Pe.
Step 133：As Pd ＞ Pg, controller ECU is adjusted to the pressure limit of urea tank（Pa+Pd/2）~（Pb+
Pd/2）；Meanwhile, controller ECU alarms need to change urea filter element.
Controller ECU is by the comprehensive analysis to airline pressure sensor and fluid path pressure sensor detection data, moreover it is possible to
The diagnosis of urea nozzle working condition is realized, the diagnosis of urea nozzle working condition comprises the steps.
Step 21, the fault detect of system electrical part：Vehicle electrifying startup, controller ECU is to system electrical part
Connecting and disconnecting of the circuit and resistance whether there is and are detected, system electrical part includes intake valve, air bleeding valve, airline pressure sensor, fluid path
Pressure sensor and urea nozzle；Judge that system electrical part is normal if normal, be otherwise judged as the electric component event of correlation
Barrier.
Step 22, system builds pressure：After step 21 judges that system electrical component working is normal, controller ECU control air inlets
Valve is opened rises urea pressure inside the tank, if airline pressure sensor signal P5 and fluid path pressure sensor signal in time T3
P6 reaches Pb, then judge that system is built and be pressed into work(；If airline pressure sensor signal P5 is not up to Pb, syndicate within the T3 times
Construction in a systematic way pressure failure failure；If P6 is not up to Pb within the T3 times, fluid path plugging fault is reported.
Reveal fault detect in step 23, gas-liquid road：System is built and is pressed into after work(, and controller ECU closes intake valve and exhaust
Valve, monitors airline pressure sensor signal P5 and fluid path pressure sensor signal P6.
a）If airline pressure sensor signal P5 pressure drops in time T5 are less than Ph, and Ph≤Pg, then system gas are judged
Road is working properly.
b）If airline pressure sensor signal P5 pressure drops in time T5 are more than or equal to Ph, the event of reporting system gas-path leakage
Barrier.
c）If fluid path pressure sensor signal P6 pressure drops in time T6 are less than Pi, and Pi<Pe, then judge that system fluid path works
Normally.
d）If fluid path pressure sensor signal P6 pressure drops in time T6 are more than or equal to Pi, the leakage event of reporting system fluid path
Barrier.
Step 24, urea nozzle fault detect：After judging that system fluid path and gas circuit are normal in step 23, controller
ECU is controlled urea nozzle and is opened once with 0.05s durations, monitoring gas-liquid road pressure differential Pd, sets Pd ranges of normal value as Pj<
Pd<Pk, and Pk≤Pe, work as Pd<Pj, then report urea nozzle plugging fault；Work as Pd>Pk, then report urea nozzle leakage failure.
In the urea nozzle parameter adjustment control process, Pa values are 670KPa, and Pb values are 730KPa, and Pe values are
50KPa, Pf value is 75KPa, and Pg values are 100KPa.
During the urea nozzle working condition diagnosis, Pi values are 20KPa, and Ph values are 100KPa, and Pj values are
15KPa, Pk value is 50KPa, and T3 values 10s, the equal values of T5 and T6 are 1s.
After the present invention is using said structure and method, the airline pressure sensor and energy that can be detected to system pressure is right
The fluid path pressure sensor that injection pressure is detected, ECU is by airline pressure sensor and fluid path pressure sensor signal
Comprehensive analysis, realize three below purpose：
1. optimize system pressure control, improve the control accuracy to urea nozzle, it is to avoid system discharges exceeded or urea crystals.
2. optimize system OBD precision, realize the accurate judgement to urea nozzle working condition.
3. pair urea filter restriction problem accurately judged, realizes that urea cleaner is maintained by resistance accurate timing.
Description of the drawings
Fig. 1 shows a kind of structural representation of dual pressure sensor formula gas drive urea injection system of the invention.
Fig. 2 shows change schematic diagram of the fluid path pressure when urea nozzle is sprayed.
Fig. 3 shows fluid path pressure change schematic diagram of the urea nozzle under different injection frequencies.
Fig. 4 shows the vertical section structure schematic diagram of fluid path pressure sensor.
Wherein have：1. urea tank；2. urea cleaner；3. intake valve；4. air bleeding valve；5. airline pressure sensor；6. liquid
Road pressure sensor；601. control chip；602. freeze protected rubber；603. sensor connector；604. conducting strip；605. liquid circulate
Road；606. figure contacts；607. electrical heating urea tubes；7. urea nozzle；8. controller ECU；9. source of the gas.
Specific embodiment
Below in conjunction with the accompanying drawings the present invention is further detailed explanation with concrete better embodiment.
As shown in figure 1, a kind of dual pressure sensor formula gas drive urea injection system, including urea tank 1, urea cleaner 2,
Source of the gas 9, urea nozzle 7 and controller ECU 8.
The voltage endurance capability of urea tank is preferably greater than 12bar, and intake valve 3 and air bleeding valve 4 are provided with urea tank, intake valve
Inlet end is connected with source of the gas.Airline pressure sensor 5 is additionally provided with urea tank, for supplying urea to controller ECU 8
The pressure signal of compressed gas in tank.
The input of urea cleaner is connected with urea tank, and the output end of urea cleaner is connected with urea nozzle.
The impurity that urea cleaner is used in filter urea liquid, it is to avoid impurity causes to damage to urea nozzle 7.
Fluid path pressure sensor 6 is provided between urea cleaner and urea nozzle, for measuring the spray of urea nozzle 7
Injection pressure.
Controller ECU 8 sets urea injecting quantity according to engine operating condition, and controls urea nozzle 7 and spray.
Above-mentioned intake valve 3, air bleeding valve 4, airline pressure sensor 5, fluid path pressure sensor 6 and urea nozzle 7 with control
Device ECU processed is connected.
As shown in figure 4, fluid path pressure sensor 6 includes control chip 601, sensor connector 603, conducting strip 604 and electrical heating
Urea tube 607.
Control chip preferably adopts Infineon SP270 pressure chips.
Sensor connector is fixedly installed on the two ends of control chip, and each sensor connector is preferably marked using SAEJ2044
Accurate quick connector.
Fluid course is provided with each sensor connector, the internal face of each fluid course is provided with conducting strip.
The periphery of each sensor connector is set with electrical heating urea tube, and the periphery of preferably each sensor connector is all provided with
Convex contact 606 is equipped with, electrical heating urea tube is engaged with corresponding convex contact.
In low temperature, there is ice blockage risk in fluid path pressure sensor 6, if design adds on fluid path pressure sensor 6
Heat structure high cost, control are complicated.Fluid path pressure sensor 6 is adopted after said structure, when electrical heating urea tube is heated, heat conduction
Piece is transferred heat to inside fluid path pressure sensor 6, so that urea thaws in sensor.Simultaneously by sensor connector 603
Plastic construction is all designed as etc. main part, the inside of fluid path pressure sensor 6 and outside temperature conduction is fully reduced.
Further, contact with the urea periphery of part of control chip is coated with freeze protected rubber.Freeze protected rubber is existing material
Material, the freeze protected rubber material as disclosed in 201510408284.2.
Urea can produce volumetric expansion when freezing, and exist the swollen bad risk of control chip 601, the setting of freeze protected rubber 602,
When freezing and expansion, ice crystal compression freeze protected rubber 602, so as to be not result in that control chip 601 is damaged.After temperature recovery, prevent
Freeze the resilience of rubber 602, such that it is able to absorb the swelling volume of urea icing repeatedly.
A kind of control method of dual pressure sensor formula gas drive urea injection system, airline pressure sensor is in urea tank
Pressure is detected that airline pressure sensor signal is set to P5.Fluid path pressure sensor is carried out to the injection pressure of urea nozzle
Detection, fluid path pressure sensor signal is set to P6.Controller ECU is by airline pressure sensor and the inspection of fluid path pressure sensor
The comprehensive analysis of data is surveyed, the control to urea injection system pressure can be realized and the diagnosis of urea nozzle working condition is realized.
Urea injection system Stress control comprises the steps.
Step 11, urea tank Stress control：Controller ECU is made by the control to intake valve and exhaust valve opening opportunity
Gas pressure in urea tank is maintained within the scope of Pa ~ Pb.The preferred values of Pa are 670KPa, and the preferred values of Pb are
730KPa。
Controller ECU is specific as follows to the control process of intake valve and exhaust valve opening opportunity.
After vehicle launch, controller ECU 8 gives the open signal of intake valve 3, and compressed gas are entered by the Jing intake valves 3 of source of the gas 9
Enter urea tank 1, air pressure is measured by airline pressure sensor 5 in urea tank 1, after pressure reaches Pb controller ECU 8 control into
Air valve 3 is closed.
As shown in Fig. 2 as urea nozzle 7 sprays urea, urea volume is reduced in urea tank 1, and gas volume increase, pressure
Power is reduced, and when pressure drops to Pa, controller ECU 8 controls again intake valve 3 and opens, it is ensured that system pressure is stable in setting model
In enclosing.
Setting urea upper pressure limit Pc, preferably 750kPa, Pc>Pb, when air pressure exceeds Pc in urea tank 1, controller
The control air bleeding valves 4 of ECU 8 are opened, and to discharge air pressure in urea tank 1, when pressure is down to Pb in urea tank 1, close air bleeding valve 4.
Step 12, the control of urea nozzle parameter：Urea drives Jing urea cleaner 2 to filter laggard by air pressure in urea tank 1
Enter urea nozzle 7, ECU 8 sets urea injecting quantity according to engine calibration situation.Urea nozzle 7 is opened according to the frequency of 1Hz,
Controller ECU 8 controls urea injecting quantity by control urea nozzle 7 unlatching duration T1 per second.
Step 13, urea nozzle parameter control when gas-liquid road pressure differential is abnormal：When urea nozzle is opened, urea fluid path
Pressure drop, as shown in Figure 2.Now, thus fluid path pressure sensor signal P6 be less than airline pressure sensor signal P5, gas-liquid road
Pressure differential is assumed to be Pd, and the higher limit of gas-liquid road pressure differential when Pe is urea normal injection, the preferred values of Pe are 50KPa.
Only work as Pd<During Pe, normal urea injection control can be just carried out.However, when system runs one section on car load
Between after, due to unavoidably there is a certain amount of impurity in urea, accumulation of impurities causes urea cleaner 2 on urea cleaner 2
Resistance increases, so that Pd>Pe.
The reduction of urea injection pressure is now effectively equivalent to, if opening duration control urea nozzle 7 still according to former
Unlatching, necessarily causes urea injecting quantity reduction, urea spraying to deteriorate, and is thus easily caused and discharges exceeded, gas exhaust piping appearance
Urea crystals, and then cause vehicle limit to turn round powerless, affect normally using for vehicle.
Work as Pd>Pe, is to ensure that vehicle is normally used during urea abnormal injection, and urea nozzle parameter is entered as follows
Row adjustment control, concrete control method is as described below.
Step 131：Work as Pe<Pd<The preferred value of Pf, Pf be 75KPa when, namely Pd spans be 50 ~ 75KPa when, control
The injection duration T2 per second of urea nozzle is adjusted to T2=k*T1 by device ECU processed, wherein, k is injection time scale modification coefficient, k=1+
Pd/（Pa+Pb）/2.
Step 132：Work as Pf<Pd<The preferred value of Pg, Pg be 100KPa when, namely Pd spans be 75 ~ 100KPa when,
When urea nozzle injection frequency is improved to 2Hz by 1Hz, decline gas-liquid road pressure differential Pd.As shown in figure 3, the solid line in Fig. 3
The pressure change under 1Hz injection frequencies is represented, the dotted line in Fig. 3 represents the pressure change under 2Hz injection frequencies.Work as system detectio
After recovering normal to system pressure, will urea nozzle open frequency be set as 1Hz.
Step 133：As Pd ＞ Pg, namely Pd spans, when being ＞ 100KPa, controller ECU is by the pressure of urea tank
Power scope is adjusted to（Pa+Pd/2）~（Pb+Pd/2）；Meanwhile, controller ECU alarms need to change urea filter
Core.
The diagnosis of urea nozzle working condition comprises the steps.
Step 21, the fault detect of system electrical part：Vehicle electrifying startup, controller ECU is to system electrical part
Connecting and disconnecting of the circuit and resistance whether there is and are detected, system electrical part includes intake valve, air bleeding valve, airline pressure sensor, fluid path
Pressure sensor and urea nozzle；Judge that system electrical part is normal if normal, be otherwise judged as the electric component event of correlation
Barrier.
Step 22, system builds pressure：After step 21 judges that system electrical component working is normal, controller ECU control air inlets
Valve is opened rises urea pressure inside the tank, if airline pressure sensor signal P5 and fluid path pressure sensor signal in time T3
P6 reaches Pb, then judge that system is built and be pressed into work(；Wherein, the preferred values of T3 are 10s.
If airline pressure sensor signal P5 is not up to Pb within the T3 times, syndicate construction in a systematic way pressure failure failure, system is stopped
Only work, trouble light is bright；If P6 is not up to Pb within the T3 times, fluid path plugging fault, system stalls, trouble light are reported
It is bright.
Reveal fault detect in step 23, gas-liquid road：System is built and is pressed into after work(, and controller ECU closes intake valve and exhaust
Valve, monitors airline pressure sensor signal P5 and fluid path pressure sensor signal P6.
a）If airline pressure sensor signal P5 pressure drops in time T5 are less than Ph, and the preferred value of Ph≤Pg, Ph is
100KPa；Then judge that system gas circuit is working properly.
b）If airline pressure sensor signal P5 pressure drops in time T5 are more than or equal to Ph, the preferred values of T5 are 1s, then
Reporting system gas-path leakage failure, system stalls, trouble light is bright.
c）If fluid path pressure sensor signal P6 pressure drops in time T6 are less than Pi, and Pi<Pe, then judge that system fluid path works
Normally.Wherein, the preferred values of T6 are 1s, and the preferred values of Pi are 20KPa.
d）If fluid path pressure sensor signal P6 pressure drops in time T6 are more than or equal to Pi, the leakage event of reporting system fluid path
Barrier.
Step 24, urea nozzle fault detect：After judging that system fluid path and gas circuit are normal in step 23, controller
ECU is controlled urea nozzle and is opened once with 0.05s durations, monitoring gas-liquid road pressure differential Pd, sets Pd ranges of normal value as Pj<
Pd<Pk, and Pk≤Pe, wherein, the preferred values of Pj are 15KPa, and the preferred values of Pk are 50KPa.Work as Pd<Pj, then report urea nozzle
Plugging fault, system stalls, trouble light is bright；Work as Pd>Pk, then report urea nozzle leakage failure, system stalls, failure
Lamp is bright.
After the diagnosis of above urea nozzle working condition all judges normally, system enters normal operating conditions.System is normal
It is monitored in real time still according to step 21 to step 24 in the course of work, it is ensured that system gas circuit, fluid path are unimpeded, urea nozzle spray
The amount of penetrating is normal, and urea filter core resistance is in setting range.
The preferred embodiment of the present invention described in detail above, but, the present invention is not limited in above-mentioned embodiment
Detail, the present invention range of the technology design in, various equivalents can be carried out to technical scheme, this
A little equivalents belong to protection scope of the present invention.
Claims (8)
1. a kind of dual pressure sensor formula gas drive urea injection system, including urea tank, urea cleaner, source of the gas, urea nozzle
With controller ECU；Intake valve and air bleeding valve are provided with urea tank, the inlet end of intake valve is connected with source of the gas；In urea tank
It is additionally provided with airline pressure sensor；The input of urea cleaner is connected with urea tank, the output end of urea cleaner with
Urea nozzle is connected；Intake valve, air bleeding valve, airline pressure sensor and urea nozzle are connected with controller ECU；It is special
Levy and be：The fluid path pressure sensor being connected with controller ECU is provided between urea cleaner and urea nozzle；The liquid
Road pressure sensor includes control chip, sensor connector, conducting strip and electrical heating urea tube；
Sensor connector is fixedly installed on the two ends of control chip, and in each sensor connector fluid course is provided with, each
The internal face of fluid course is provided with conducting strip；The periphery of each sensor connector is set with electrical heating urea tube.
2. dual pressure sensor formula gas drive urea injection system according to claim 1, it is characterised in that：The control core
Contact with the urea periphery of part of piece is coated with freeze protected rubber.
3. dual pressure sensor formula gas drive urea injection system according to claim 1, it is characterised in that：Each sensor
Joint is using the quick connector of SAEJ2044 standards.
4. dual pressure sensor formula gas drive urea injection system according to claim 1, it is characterised in that：Urea tank it is resistance to
Pressure energy power is more than 12bar.
5. a kind of control method of dual pressure sensor formula gas drive urea injection system, it is characterised in that：Airline pressure sensor
Urea pressure inside the tank is detected, fluid path pressure sensor is detected to the injection pressure of urea nozzle；Controller ECU leads to
The comprehensive analysis to airline pressure sensor and fluid path pressure sensor detection data is crossed, can be realized to urea injection system pressure
Control；Urea injection system Stress control comprises the steps：
Step 11, urea tank Stress control：Controller ECU makes urea by the control to intake valve and exhaust valve opening opportunity
Gas pressure in tank is maintained within the scope of Pa ~ Pb；
Step 12, the control of urea nozzle parameter：Urea nozzle is opened according to the injection frequency of 1Hz, and controller ECU is by controlling urine
Plain nozzle unlatching duration T1 control urea injecting quantities per second；
Step 13, urea nozzle parameter control when gas-liquid road pressure differential is abnormal：When urea nozzle is opened, urea fluid path pressure
Decline, therefore fluid path pressure sensor signal is less than airline pressure sensor signal, gas-liquid road pressure differential is assumed to be Pd, and Pe is urea
The higher limit of gas-liquid road pressure differential during normal injection；Work as Pd>Pe, is to ensure that vehicle is normally used during urea abnormal injection, will be urinated
Plain nozzle parameter is adjusted as follows control：
Step 131：Work as Pe<Pd<During Pf, the injection duration T2 per second of urea nozzle is adjusted to T2=k*T1 by controller ECU, its
In, k is injection time scale modification coefficient, k=1+Pd/（Pa+Pb）/ 2, Pf span is 1.5Pe ~ 2Pe；
Step 132：Work as Pf<Pd<During Pg, when urea nozzle injection frequency is improved to 2Hz by 1Hz, gas-liquid road pressure differential Pd is made
Decline；Wherein, Pg spans are 2Pe ~ 3Pe；
Step 133：As Pd ＞ Pg, controller ECU is adjusted to the pressure limit of urea tank（Pa+Pd/2）~（Pb+Pd/2）；
Meanwhile, controller ECU alarms need to change urea filter element.
6. the control method of dual pressure sensor formula gas drive urea injection system according to claim 5, it is characterised in that：
Controller ECU is by the comprehensive analysis to airline pressure sensor and fluid path pressure sensor detection data, moreover it is possible to realize urea
The diagnosis of nozzle operation state, urea nozzle working condition diagnosis comprises the steps：
Step 21, the fault detect of system electrical part：Vehicle electrifying startup, circuits of the controller ECU to system electrical part
Break-make and resistance whether there is and are detected, system electrical part includes intake valve, air bleeding valve, airline pressure sensor, fluid path pressure
Sensor and urea nozzle；Judge that system electrical part is normal if normal, be otherwise judged as the electrical component failures of correlation；
Step 22, system builds pressure：After step 21 judges that system electrical component working is normal, controller ECU control intake valves are beaten
Opening rises urea pressure inside the tank, if airline pressure sensor signal P5 and fluid path pressure sensor signal P6 are equal in time T3
Pb is reached, is then judged that system is built and is pressed into work(；If airline pressure sensor signal P5 is not up to Pb, syndicate construction in a systematic way within the T3 times
Pressure failure failure；If P6 is not up to Pb within the T3 times, fluid path plugging fault is reported；
Reveal fault detect in step 23, gas-liquid road：System is built and is pressed into after work(, and controller ECU closes intake valve and air bleeding valve, prison
Survey airline pressure sensor signal P5 and fluid path pressure sensor signal P6；
a）If airline pressure sensor signal P5 pressure drops in time T5 are less than Ph, and Ph≤Pg, then system gas circuit work is judged
Make normal；
b）If airline pressure sensor signal P5 pressure drops in time T5 are more than or equal to Ph, reporting system gas-path leakage failure；
c）If fluid path pressure sensor signal P6 pressure drops in time T6 are less than Pi, and Pi<Pe, then judge that system fluid path works
Normally；
d）If fluid path pressure sensor signal P6 pressure drops in time T6 are more than or equal to Pi, reporting system fluid path leakage failure；
Step 24, urea nozzle fault detect：After judging that system fluid path and gas circuit are normal in step 23, controller ECU controls
Urea nozzle processed is opened once with 0.05s durations, monitoring gas-liquid road pressure differential Pd, sets Pd ranges of normal value as Pj<Pd<Pk,
And Pk≤Pe, work as Pd<Pj, then report urea nozzle plugging fault；Work as Pd>Pk, then report urea nozzle leakage failure.
7. the control method of dual pressure sensor formula gas drive urea injection system according to claim 6, it is characterised in that：
In the urea nozzle parameter adjustment control process, Pa values are 670KPa, and Pb values are 730KPa, and Pe values are 50KPa, Pf
Value is 75KPa, and Pg values are 100KPa.
8. the control method of dual pressure sensor formula gas drive urea injection system according to claim 6, it is characterised in that：
During the urea nozzle working condition diagnosis, Pi values are 20KPa, and Ph values are 100KPa, and Pj values are 15KPa, Pk
Value is 50KPa, and T3 values 10s, the equal values of T5 and T6 are 1s.
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| CN114483267B (en) * | 2022-02-23 | 2023-03-10 | 一汽解放汽车有限公司 | Supply device and control method for SCR (selective catalytic reduction) dual-injection urea for vehicle |
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