CN102155276A - Tail gas emission purification system of diesel engine - Google Patents

Tail gas emission purification system of diesel engine Download PDF

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Publication number
CN102155276A
CN102155276A CN2011100273819A CN201110027381A CN102155276A CN 102155276 A CN102155276 A CN 102155276A CN 2011100273819 A CN2011100273819 A CN 2011100273819A CN 201110027381 A CN201110027381 A CN 201110027381A CN 102155276 A CN102155276 A CN 102155276A
Authority
CN
China
Prior art keywords
urea
diesel engine
oxynitrides
oxynitride
tail gas
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN2011100273819A
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Chinese (zh)
Inventor
齐芳
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
YANTAI HUALONG BUSINESS MACHINE CO Ltd
Original Assignee
YANTAI HUALONG BUSINESS MACHINE CO Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by YANTAI HUALONG BUSINESS MACHINE CO Ltd filed Critical YANTAI HUALONG BUSINESS MACHINE CO Ltd
Priority to CN2011100273819A priority Critical patent/CN102155276A/en
Publication of CN102155276A publication Critical patent/CN102155276A/en
Pending legal-status Critical Current

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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
    • Y02T10/40—Engine management systems

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  • Exhaust Gas After Treatment (AREA)

Abstract

The invention discloses a method for controlling oxynitride NOX during tail gas emission of a diesel engine. A tail gas emission purification system of the diesel engine mainly comprises an electronic control unit, an oxynitride NOX sensor, a urea ejection unit, a urea box, a pipeline related to the urea box and a packaged carrier which is arranged in an exhaust pipeline and is coated with a selective catalyst. The system is characterized in that: the concentration of the oxynitride in exhaust gas is measured by the oxynitride NOX sensor (6) which is arranged in front of the carrier coated with a selective catalysis reducing agent, and is fed back to the electronic control unit so as to calculate the required ejection amount of urea, and ejection is performed by the urea ejection unit. Compared with the prior art, the system has the characteristics that: the emission condition of the engine under different vehicle conditions can be actually reflected through the feedback of the oxynitride NOX sensor, and the ejection amount of the urea is further controlled accurately, but is not only determined in an engine calibration mode, so that control accuracy is greatly improved, and the oxynitride NOX during the tail gas emission of the diesel engine is more effectively reduced.

Description

Diesel engine exhaust emission purifying system
Technical field:
The present invention relates to a kind of control diesel engine exhaust emission system, particularly have oxynitrides NO XThe exhaust emissions of diesel engine cleaning system of sensor feedback control.
Background technique:
Diesel engine is because of its good dynamic property, and oil consumption is low, and good reliability has obtained application more and more widely in the modern society of energy growing tension.Compare with petrol engine, harmful gas HC that diesel engine produces and the discharge amount of CO are quite low.The high-pressure common rail motor can be reduced to the granular material discharged of diesel engine below the national legislation limit value, but while oxynitrides NO XThe discharging height is one of key factor of restriction diesel engine development.Therefore, diesel engine oxynitrides NO XThe discharging post-processing technology is paid close attention to by people for many years always.The SCR technology that extensively adopts is to solve diesel engine oxynitrides NO at present XOne of major technique of emission problem.In this SCR system, the control modes that adopt MAP figure, characteristics are in that transformation efficiency is higher at ordinary times near output water, but along with the continuous increase of Vehicle-Miles of Travel in engine condition more, the situation of motor constantly worsens, and great changes have just taken place in the original discharging of motor.In this case, existing open-loop control system just can not satisfy usage requirement, bigger variation takes place when making emission of diesel engine and new car, even arrived uncontrollable stage.
Summary of the invention:
The object of the present invention is to provide a kind of oxynitrides NO that has XThe exhaust emissions of diesel engine cleaning system of sensor feedback control.
For reaching this purpose, the present invention adopts following technological scheme: the cleaning system that the present invention relates to a kind of diesel engine exhaust emission, be by urea box assembly (1), metered injection unit (2) has applied the catalytic converter (3) of selective catalytic reducing agent, electronic control unit (4), oxynitrides NOx sensor (7), temperature transducer (8,9), urea-spray head (10) is formed.Feature of the present invention is the preceding oxynitrides NOx sensor (6) of installing again of the urea-spray head (10) in the diesel engine exhaust emission pipeline, real-time collects oxynitrides NO in the exhaust XConcentration signal be transferred to electronic control unit (4).According to oxynitrides NO in the exhaust that collects in real time XConcentration calculate the amount of the urea liquid that need to spray, spray more exactly, thereby really reach the oxynitrides NO that under different operating modes, reduces diesel engine emissions XEffect.
For selective catalytic reduction (SCR) technology can normally be worked, the present invention has installed oxynitrides NO at the catalytic converter front end XSensor, like this can be real-time collect oxynitrides NO in the exhaust XConcentration, compare with traditional control mode, the present invention is by reflecting the motor operation conditions truly, according to collecting oxynitrides NO in the exhaust in real time XConcentration calculate the amount of the urea liquid that need to spray, spray more exactly, thereby really reach the oxynitrides NO that reduces diesel engine emissions XEffect.
Description of drawings:
Figure of description 1 is a system schematic of the present invention
Embodiment:
Further describe the present invention below in conjunction with accompanying drawing.
The present invention uses selective catalytic reduction (SCR) technology, utilizes urea liquid that the nitrogen oxide in the tail gas is handled.Usually the material of catalytic converter (3) is the cordierite carrier that has applied selective catalytic reducing agent.Be installed in the oxynitrides NO of catalytic converter (3) front end XSensor (6) constantly transmits oxynitrides NO in the diesel engine exhaust can for electronic control unit ECU (4) XThe live signal of concentration, electronic control unit ECU (4) is according to the signal of receiving, and in conjunction with a series of corrected signals such as temperature signal of temperature transducer (8, the 9) feedback of the rotating speed that obtains with the communication of control unit of engine (5) and torque signal and collection, through calculating the amount that needs the urea liquid that sprays.Electronic control unit ECU (4) can send injection signal to injection unit (2), this injection signal is the amount of calculating through accurately, injection unit (2) can be made action, spray corresponding urea liquid, spray to the catalytic converter that has applied selective catalytic reducing agent (3) front end by the urea solution jet head (10) that is installed on the engine exhaust pipe, catalytic converter (3) is with oxynitrides NO in the diesel engine exhaust emission XReduction is removed oxynitrides NO thereby reach XPurpose.In the rear end of selective catalytic reduction (SCR) purifier (3), an oxynitrides NO has been installed XSensor (7) is used to monitor the working condition of this cleaning system, in case it is undesired to detect system works, to report to the police by various forms, remind the user that system is safeguarded, fault data that simultaneously can scoring system has played the effect of self diagnosis (OBD).And play the effect of a feedback control.

Claims (1)

1. diesel engine exhaust emission purifying system, be by urea box assembly (1), metered injection unit (2), applied the catalytic converter (3) of selective catalytic reducing agent, electronic control unit (4), oxynitrides NOx sensor (7), temperature transducer (8,9), urea-spray head (10) is formed, feature of the present invention is the preceding oxynitrides NOx sensor (6) of installing again of the urea-spray head (10) in the diesel engine exhaust emission pipeline, collects oxynitrides NO in the exhaust in real time XConcentration signal be transferred to electronic control unit (4), according to oxynitrides NO in the exhaust that collects in real time XConcentration calculate the amount of the urea liquid that need to spray, spray more exactly, thereby really reach the oxynitrides NO that under different operating modes, reduces diesel engine emissions XEffect.
CN2011100273819A 2011-01-26 2011-01-26 Tail gas emission purification system of diesel engine Pending CN102155276A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2011100273819A CN102155276A (en) 2011-01-26 2011-01-26 Tail gas emission purification system of diesel engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2011100273819A CN102155276A (en) 2011-01-26 2011-01-26 Tail gas emission purification system of diesel engine

Publications (1)

Publication Number Publication Date
CN102155276A true CN102155276A (en) 2011-08-17

Family

ID=44436919

Family Applications (1)

Application Number Title Priority Date Filing Date
CN2011100273819A Pending CN102155276A (en) 2011-01-26 2011-01-26 Tail gas emission purification system of diesel engine

Country Status (1)

Country Link
CN (1) CN102155276A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114278413A (en) * 2020-09-28 2022-04-05 长城汽车股份有限公司 Urea injection system, method and vehicle
CN114475605A (en) * 2022-02-16 2022-05-13 东风商用车有限公司 Double-layer prediction control method for energy conservation of heavy truck based on internet connection information
CN115791911A (en) * 2022-11-28 2023-03-14 徐州芯源诚达传感科技有限公司 Binary channels nitrogen oxygen sensor of six tail gas processing system in diesel vehicle state is exclusively used in

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000282942A (en) * 1999-03-29 2000-10-10 Toyota Motor Corp Exhaust emission control device of internal-combustion engine
CN101074620A (en) * 2006-05-19 2007-11-21 J.埃贝斯佩歇合资公司 Exhausting back treating device for internal combustion engine
US20080134670A1 (en) * 2006-12-07 2008-06-12 Avl List Gmbh Internal combustion engine with an exhaust emission control system
US20090100827A1 (en) * 2007-10-17 2009-04-23 Mitsubishi Fuso Truck And Bus Corporation Exhaust gas purification apparatus for internal combustion engine
CN101598057A (en) * 2008-06-06 2009-12-09 德尔菲技术公司 Sosimetric system decided by reagent and reagent is decided dosage method
CN101845982A (en) * 2009-03-02 2010-09-29 通用汽车环球科技运作公司 Select the NO of catalyst reduction system XThe diagnosis based on model of sensor fault

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000282942A (en) * 1999-03-29 2000-10-10 Toyota Motor Corp Exhaust emission control device of internal-combustion engine
CN101074620A (en) * 2006-05-19 2007-11-21 J.埃贝斯佩歇合资公司 Exhausting back treating device for internal combustion engine
US20080134670A1 (en) * 2006-12-07 2008-06-12 Avl List Gmbh Internal combustion engine with an exhaust emission control system
US20090100827A1 (en) * 2007-10-17 2009-04-23 Mitsubishi Fuso Truck And Bus Corporation Exhaust gas purification apparatus for internal combustion engine
CN101598057A (en) * 2008-06-06 2009-12-09 德尔菲技术公司 Sosimetric system decided by reagent and reagent is decided dosage method
CN101845982A (en) * 2009-03-02 2010-09-29 通用汽车环球科技运作公司 Select the NO of catalyst reduction system XThe diagnosis based on model of sensor fault

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114278413A (en) * 2020-09-28 2022-04-05 长城汽车股份有限公司 Urea injection system, method and vehicle
CN114278413B (en) * 2020-09-28 2022-11-29 长城汽车股份有限公司 Urea injection system, method and vehicle
CN114475605A (en) * 2022-02-16 2022-05-13 东风商用车有限公司 Double-layer prediction control method for energy conservation of heavy truck based on internet connection information
CN114475605B (en) * 2022-02-16 2024-01-19 东风商用车有限公司 Double-layer prediction control method for energy conservation of heavy truck based on internet connection information
CN115791911A (en) * 2022-11-28 2023-03-14 徐州芯源诚达传感科技有限公司 Binary channels nitrogen oxygen sensor of six tail gas processing system in diesel vehicle state is exclusively used in

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Application publication date: 20110817