WO2021213093A1 - Procédé de diagnostic d'anomalie pour appareil d'injection d'urée scr - Google Patents

Procédé de diagnostic d'anomalie pour appareil d'injection d'urée scr Download PDF

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Publication number
WO2021213093A1
WO2021213093A1 PCT/CN2021/081603 CN2021081603W WO2021213093A1 WO 2021213093 A1 WO2021213093 A1 WO 2021213093A1 CN 2021081603 W CN2021081603 W CN 2021081603W WO 2021213093 A1 WO2021213093 A1 WO 2021213093A1
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WO
WIPO (PCT)
Prior art keywords
value
urea
pressure
scr
time interval
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PCT/CN2021/081603
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English (en)
Chinese (zh)
Inventor
陈一平
何家明
蔡继业
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上海星融汽车科技有限公司
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Application filed by 上海星融汽车科技有限公司 filed Critical 上海星融汽车科技有限公司
Priority to CA3131581A priority Critical patent/CA3131581A1/fr
Priority to AU2021236547A priority patent/AU2021236547A1/en
Publication of WO2021213093A1 publication Critical patent/WO2021213093A1/fr

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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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/148—Arrangement of sensors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

Definitions

  • the invention relates to a fault diagnosis method for an SCR urea spraying device, and belongs to the technical field of vehicle-mounted equipment detection.
  • the technical principle of SCR is to use a reducing agent to selectively reduce nitrogen oxides to nitrogen and water in an oxygen-rich environment under the action of a catalyst.
  • the reducing agent currently used is urea solution (for example, a urea solution with a mass concentration of 32.5%).
  • the urea solution decomposes into NH 3 and CO 2 at high temperature, and chemically reacts with NO and NO 2 in the exhaust gas of diesel vehicles to produce nitrogen. And water, meet the requirements of emission regulations.
  • the reducing agent urea solution is sprayed after being pressurized by the urea pump and atomized by the urea nozzle.
  • the urea pump builds pressure.
  • the pressure in the urea tank is slowly increased and then maintained at about normal working pressure (the pressure is maintained at the normal working pressure after the device is built); when the injection conditions are met,
  • the engine control unit or DCU issues a command to open the urea nozzle; when the engine is finished, the key switch is turned off, and the urea pump enters the reverse pumping phase.
  • the pump will pump the remaining urea in the pipeline and nozzles back into the urea box.
  • the opening of the nozzle periodically changes with time to realize the urea solution spraying cycle one after another.
  • the urea solution is sprayed, and the pressure in the outlet pipe drops.
  • the urea When the pump receives a signal that the pressure of the urea solution in the outlet pipe is insufficient, it will increase the duty cycle to supplement more urea solution into the outlet pipe to stabilize the pressure.
  • one aspect of the present invention provides a fault diagnosis method for SCR urea spraying device, wherein:
  • the fault diagnosis method includes the following steps:
  • Step 1) Obtain the pressure value of the urea solution in the outlet pipe of the SCR urea spraying device in real time;
  • Step 2) Define a detection period T, and divide one detection period T into n time intervals t i (t 1 , t 2 & t n ) according to time sequence; when the detection period T is initially The cumulative value of abnormal conditions is set to zero;
  • Step 3) t i sequentially urea solution and the corresponding pressure values are plotted in FIG box, and the box plot analysis, it is determined whether the time interval t i abnormal situation of the time interval; if abnormal In case, the cumulative value of abnormal conditions increases by 1, otherwise, the cumulative value of abnormal conditions does not increase;
  • the method for judging the abnormal situation is: obtaining the corresponding upper quartile and lower quartile according to the maximum pressure value and the minimum pressure value in the box chart, and calculating the The difference between the upper quartile and the lower quartile is counted as the interquartile difference of the time interval; the interquartile difference of the time interval is compared with the pre-measured standard interquartile difference, if If it is greater than the standard interquartile range, it is judged that there is an abnormal situation;
  • Step 4) If the abnormality cumulative value reaches a threshold value, a fault alarm, end detection; abnormality if the cumulative value does not reach the threshold value, the time interval T i of the number i is incremented by one;
  • Step 5) If the value of the serial number i is less than or equal to n, return to step 3); if the value of the serial number i is greater than n, return to step 2) to enter the next detection cycle.
  • the numerical value of the standard interquartile range and the threshold value are obtained in advance through simulation analysis in a laboratory.
  • the pressure value of the urea solution in the outlet pipe of the SCR urea spraying device is obtained in real time through a pressure sensor arranged on the outlet pipe of the SCR urea spraying device, and the data Transfer to the controller.
  • the present invention provides a fault diagnosis method for the SCR urea spraying device; when the car is driving, the method can monitor and extract the pressure of the urea solution in the outlet pipe of the SCR urea spraying device in real time. Compare the deviation of the urea solution pressure interquartile range with the standard interquartile range within a certain detection period.
  • real-time fault diagnosis of the SCR urea spraying device can be realized, and under fault conditions, the The diagnosis results are promptly provided to the driver in order to prevent the unbalanced discharge of the urea solution and unstable pressure from affecting the safety and stability of driving.
  • FIG. 1 is a schematic flowchart of a specific embodiment of the fault diagnosis method for the SCR urea spraying device of the present invention
  • Figure 2 is a schematic diagram of the simple structure of the SCR urea spraying device
  • Figure 3 is a set of box diagrams in Example 1;
  • Figure 4 is another set of box diagrams in Example 1.
  • Fig. 2 which mainly includes a urea tank 1, a urea pump 2, a liquid outlet pipe 3, a liquid outlet 4, a nozzle 5, a pressure sensor 6 and a controller 7.
  • the urea tank 1 stores the urea solution; the urea pump 2 draws or pours the urea solution from the urea tank 1.
  • the urea tank 1 and the urea pump 2 are connected through the extraction pipeline 12 and the return pipeline 21, and the extraction pipeline 12 is provided with The liquid inlet 120 and its filtering, and the return pipe 21 is provided with a liquid return port 210; the urea solution drawn from the urea tank 1 by the urea pump 2 through the extraction pipe 12 enters the liquid outlet pipe 3, and then passes through the liquid outlet 4 Reaching the nozzle 5, when the switch on the nozzle 5 is turned on, the urea solution is sprayed from the nozzle 5.
  • the outlet pipe 3 is provided with a pressure sensor 6 that monitors the pressure of the urea solution in the outlet pipe 3 in real time, and the pressure sensor 6 transmits the pressure value of the urea solution obtained in real time to the controller 7.
  • the controller 7 controls the operation of the urea pump 2, the pressure sensor 6 and the nozzle 5.
  • the controller 7 analyzes and obtains the inside of the outlet pipe 3. A signal of insufficient pressure of the urea solution, and at the same time instructs the urea pump 2 to draw the urea solution into the outlet pipe 3 to stabilize the pressure.
  • the urea pump 2 is aging in its SCR urea spraying device, the inlet 120 and its filter are blocked, it will be difficult for the urea pump 2 to replenish the pressure in the outlet pipe 3, which will cause the nozzle 5 to open after the nozzle 5 is turned on. It is more difficult to replenish the pressure of the urea solution in the liquid outlet pipe 3 in time, resulting in more obvious pressure fluctuations, and the resulting imbalance and instability of the urea solution will also affect the operation of the SCR post-processing system.
  • a fault diagnosis method for SCR urea spraying device which includes the following steps:
  • Step 1) Obtain the pressure value of the urea solution in the outlet pipe of the SCR urea spraying device in real time.
  • the pressure sensor 6 on the liquid outlet pipe 3 in the device obtains the pressure value of the urea solution in the liquid outlet pipe 3 in real time, and transmits the data to the controller 7.
  • Step 2) Define the detection period T, and divide a detection period T into n time intervals t i (t 1 , t 2 &t n ) according to the time sequence; the abnormal situation at the beginning of the detection period T is accumulated The value is set to zero;
  • Step 3) sequentially time interval t i corresponding to the urea solution and the pressure values are plotted in FIG box, and the box plot analysis, the time interval is determined whether the i t abnormality occurs; if an abnormal condition occurs, The cumulative value of abnormal conditions increases by 1, otherwise, the cumulative value of abnormal conditions does not increase.
  • step 2) the method of judging abnormal situations is: obtain the corresponding upper quartile and lower quartile according to the maximum pressure value and minimum pressure value in the box chart, and calculate the upper quartile and the lower quartile The difference of the quantile is counted as the interquartile difference of the time interval; the interquartile difference of the time interval is compared with the standard interquartile difference measured in advance, if it is greater than the standard interquartile difference, it is judged as An abnormal situation occurred.
  • Step 4) If the abnormality cumulative value reaches a threshold value, a fault alarm, end detection; abnormality if the cumulative value does not reach the threshold value, the time interval T i of the number i is incremented by one;
  • Step 5) If the value of the sequence number i is less than or equal to n, return to step 3); if the value of the sequence number i is greater than n, then return to step 2) to enter the next detection cycle.
  • T is the detection period.
  • a detection period T is divided into n time intervals t i (t 1 , t 2 ??t n ) according to time sequence; t i is any one of the time intervals.
  • the detection period T is set by the user according to the current actual usage and requirements. Those skilled in the art can select an appropriate value according to the specific situation and give feedback on the state of the SCR urea spraying device, so as to efficiently and accurately identify its fault, and to meet the requirements of no false alarms or underreports.
  • P represents the pressure value of the urea solution in the liquid pipe 3.
  • the standard interquartile range of the test cycle (expressed as ⁇ P0) is obtained in advance through simulation analysis in the laboratory; for example, the pressure value P of the urea solution in the outlet pipe 3 is used as the judgment data source, and a complete set of SCR is used in advance
  • the system conducts the experiment, extracts the real-time urea solution pressure value P data and divides into groups according to the detection period T to make a box diagram and extracts the parameters to calculate the interquartile range.
  • the interquartile range of multiple sets of standard data is averaged, which is the above The standard interquartile difference ⁇ P0.
  • threshold C max of the cumulative value of abnormal conditions also called warning count, is also obtained in advance through simulation analysis in the laboratory.
  • abnormality cumulative value reaches a threshold value (warning count C max)
  • step 3 If the value of sequence number i is less than or equal to n, then return to step 3), that is, analyze and judge the next time interval; if the value of sequence number i is greater than n, it means that the entire detection period T has ended, and the entire detection period T If the cumulative value of abnormal conditions is less than the threshold C max , return to step 2) for the next detection cycle. The cumulative value of abnormal conditions in the next detection cycle is reset to zero (ie, C is cleared).
  • the controller 7 issues a fault alarm, for example, to remind the driver that the pressure of the urea solution in the SCR system fluctuates greatly. Failure; end of detection.
  • the time interval sequentially detected time interval t 1 to t 100, the entire detection period T are all finished, and the abnormality detection period T is the entire accumulation value is smaller than the threshold value C max, the increased index i 1.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

L'invention concerne un procédé de diagnostic d'anomalie pour appareil d'injection d'urée à réduction catalytique sélective (SCR), appartenant au domaine technique de la détection de dispositif monté sur véhicule; lorsqu'un véhicule automobile se déplace, le procédé peut surveiller et reproduire en temps réel la pression de la solution d'urée dans un tube de sortie de liquide d'un appareil de pulvérisation d'urée SCR, et comparer en temps réel l'écart entre la plage interquartile de pression de solution d'urée et la plage interquartile standard dans une période de détection donnée; au moyen du procédé statistique, il est possible d'obtenir un diagnostic d'anomalie en temps réel de l'appareil de pulvérisation d'urée à SCR, et, dans un état d'anomalie, signaler à un conducteur un résultat de diagnostic d'une manière repide, afin d'empêcher que la solution d'urée n'affecte la sécurité et la stabilité de déplacement du véhicule automobile en raison d'un déséquilibre de la solution d'urée et d'une pression instable.
PCT/CN2021/081603 2020-09-10 2021-03-18 Procédé de diagnostic d'anomalie pour appareil d'injection d'urée scr WO2021213093A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CA3131581A CA3131581A1 (fr) 2020-09-10 2021-03-18 Methode de detection des defaillances dans les dispositifs d'injection d'uree a reduction catalytique selective
AU2021236547A AU2021236547A1 (en) 2020-09-10 2021-03-18 Failure detection method for SCR urea injection devices

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CN202010945468.3A CN112031903B (zh) 2020-09-10 2020-09-10 一种针对scr尿素喷射装置的故障诊断方法
CN202010945468.3 2020-09-10

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CN114607494A (zh) * 2022-03-04 2022-06-10 潍柴动力股份有限公司 一种监测尿素箱加热电磁阀故障的方法及装置
CN114673581A (zh) * 2022-03-22 2022-06-28 潍柴动力股份有限公司 一种确定尿素泵是否处于待保养状态的方法及装置

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CN112031903B (zh) * 2020-09-10 2021-04-02 上海星融汽车科技有限公司 一种针对scr尿素喷射装置的故障诊断方法
CN114251165B (zh) * 2021-12-08 2023-03-21 潍柴动力股份有限公司 压力管功率检测方法、装置、存储介质和车辆

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US20090217644A1 (en) * 2008-03-03 2009-09-03 Hyundai Motor Company Urea-SCR System and Control Method Thereof
CN102052133A (zh) * 2009-11-06 2011-05-11 博世株式会社 还原剂喷射阀的异常检测装置及异常检测方法
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CN114607494A (zh) * 2022-03-04 2022-06-10 潍柴动力股份有限公司 一种监测尿素箱加热电磁阀故障的方法及装置
CN114673581A (zh) * 2022-03-22 2022-06-28 潍柴动力股份有限公司 一种确定尿素泵是否处于待保养状态的方法及装置
CN114673581B (zh) * 2022-03-22 2023-01-24 潍柴动力股份有限公司 一种确定尿素泵是否处于待保养状态的方法及装置

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CN112031903A (zh) 2020-12-04
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