CN106762053A - A kind of optimal control method of plug and play urea injection system OBD monitoring - Google Patents

A kind of optimal control method of plug and play urea injection system OBD monitoring Download PDF

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Publication number
CN106762053A
CN106762053A CN201611227564.4A CN201611227564A CN106762053A CN 106762053 A CN106762053 A CN 106762053A CN 201611227564 A CN201611227564 A CN 201611227564A CN 106762053 A CN106762053 A CN 106762053A
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Prior art keywords
ecu
steps
urea
fid
triggering
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CN201611227564.4A
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CN106762053B (en
Inventor
安丽花
王孝莉
王军
刘正锐
李国朋
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Weichai Power Co Ltd
Weichai Power Emission Solutions Technology Co Ltd
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Weichai Power Emission Solutions Technology Co Ltd
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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
    • F01N3/24—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 constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • 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
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N9/00—Electrical control of exhaust gas treating apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
    • F01N2610/146—Control thereof, e.g. control of injectors or injection valves
    • 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

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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

The present invention proposes a kind of optimal control method of plug and play urea injection system OBD monitoring, methods described is under conditions of plug and play system can not receive the working condition of pump and be pumped and process, by the trigger request for changing DCU ends fault code indications and ECU ends, increase a SPN1 and the failure that urea pump is not attempting building always pressure in spray regime, system is made a definite diagnosis into process, be processed as not associating bright light and triggering ECU not entering line efficiency diagnosis.Increasing another SPN2 causes pump to stop and limited after 50 hours to turn round urea pump failure, is processed as associating bright light and triggering ECU not entering line efficiency diagnosis, so as to more meet laws and regulations requirement.

Description

A kind of optimal control method of plug and play urea injection system OBD monitoring
Technical field
The invention belongs to technical field of engines, more particularly to engine exhaust post-processing technology field.
Background technology
At present, that diesel engine vent gas post-processing technology most main flow is SCR technology (SCR), SCR technology Cardinal principle is that to spraying urea in tail gas, hydrolysis of urea is anti-with nitrogen oxides in tail gas in the presence of catalyst into ammonia Should, by the nitrogen of its reproducibility environmental sound.
SCR spraying systems are the diesel emission key components and parts used during upgrading, and the OBD monitoring of SCR spraying systems is It is no to meet laws and regulations requirement, and it is to ensure the SCR normal premises of spraying system trouble shooting that can be accurately judged to failure.
For the OBD monitoring of Non-Plug and Play, normal ECU is 1 (FID, functional label by the mark position that efficiency is diagnosed Symbol), diagnosis of having ready conditions is carried out, and in the case where the state of pump and pump pressure normal condition is monitored, just enter line efficiency diagnosis.
But the ECU of plug and play spraying system can not process the urea pump state and pump pressure sent by message.So working as The flag bit of preceding plug and play system efficiency diagnosis is 0, or flag bit is 1 but when state machine is input into by the state mark of urea pump It is set to spray regime, all the period of time enters line efficiency diagnosis.It can be seen that, existing plug and play OBD monitoring strategies have the disadvantage that：
(1) cause the pump stopping time when urea pump breaks down, but fault level is that ECU ends are still being entered when limiting to turn round after 50 hours Line efficiency is diagnosed, and to be surpassed five surpass seven failures and can stop failure than pump and is first quoted, and is caused engine to limit and is turned round, and this is not meet laws and regulations requirement 's；
(2) when urea pump makes a definite diagnosis process in failure, pipeline heating is such as carried out, trial is built and presses unsuccessful, continues to attempt to During process, although ECU ends have emitted dose to ask, and DCU ends are not carried out, and are at this time still entering line efficiency diagnosis, surpass and five surpass seven events Hinder and be likely to quote, cause engine to limit and turn round, this is also not meet laws and regulations requirement, and easily cause frequently limit torsion, cause visitor It is discontented with family.
The content of the invention
For the drawbacks described above of prior art, the present invention provides a kind of the excellent of plug and play urea injection system OBD monitoring Change method, the method can by changing the trigger request of DCU ends fault code indications and ECU ends, reduce because urea pump pump stops or Failure makes a definite diagnosis the efficiency diagnosis limit for causing and turns round risk.
Term of the present invention and abbreviation are explained as follows：
SCR urea injection systems：That is urea pump, function is to measure and spray urea, is that one kind presses urea (reducing agent) Specified amount is ejected into the device in reactor.
ECU：Engine electronic control unit (Electronic Control Unit), in engine operation process, ECU carries out calculation process to various sensor signals, then output order, and control fuel injector and urea injection system etc. are performed Device.
DCU：Urea sprays electronic control unit (Dosing Control Unit), receives the demand emitted dose that ECU sends Deng signal, by driving urea pump to be measured and sprayed aqueous solution of urea after calculation process.
SPN：Constant array of DCU suspect parameter numbers causing DFC, triggering The DCU fault diagnosis sequence numbers of DFC.
DFC：Diagnostic Fault Check, trouble shooting.
FID：Function Identifier, functional label symbol.
The purpose of the present invention is achieved through the following technical solutions.
A kind of optimal control method of plug and play urea injection system OBD monitoring, methods described comprises the following steps：
S1：DCU judges urea pump working condition, and result of determination then terminates flow if normal injection state；
S2：If S1 steps result of determination is improper spray regime, DCU sends triggering trouble shooting (DFC) DCU fault diagnosises sequence number (SPN) give ECU；
S3：ECU triggers trouble shooting (DFC) after receiving SPN；
S4：DFC correlation function marker characters FID；
S5：FID association ECU ends, make it not carry out NOx emission efficiency and diagnose and associate corresponding warning light request.
Further, when the improper spray regime of S2 steps be in failure make a definite diagnosis during state；Now work as urea When pump is non-ejection state, further judge whether urea tube or urea box are in just in heated condition, if it is decided that result is It is no, then terminate flow；If it is determined that result is yes, then the DCU fault diagnosis sequence numbers of the triggering DFC for sending are defined as SPN1； Also, triggering trouble shooting (DFC) is defined as trouble shooting 1 (DFC1) after ECU receives SPN1 in S3 steps；DFC1 in S4 steps Correlation function marker character FID；FID association ECU ends in S5 steps, make it not carry out NOx emission efficiency diagnosis, and the police for associating The request of report lamp is not bright light request.
Further, when the improper spray regime of S2 steps causes termination of pumping, and fault level for urea pump breaks down To limit the state of torsion after 50 hours；The DCU fault diagnosis sequence numbers of the triggering DFC for then sending are defined as SPN2；Also, S3 steps Triggering trouble shooting (DFC) is defined as trouble shooting 2 (DFC2) after middle ECU receives SPN2；DFC2 correlation functions mark in S4 steps Note symbol FID；FID association ECU ends in S5 steps, make it not carry out NOx emission efficiency diagnosis, and the warning light request for associating is The bright light request of torsion is limited after 50 hours.
Further, DFC1 associates a FID with DFC2, and the ECU actions of triggering surpass not carry out NOx emission efficiency and five surpass seven Diagnosis.
The advantage of the invention is that：
(1) hardware design and arrangement need not be changed, and urea pump state and pump pressure receiving area can not be carried out at ECU ends In the case of reason, you can reach optimization plug and play urea injection system OBD monitoring purposes；
(2) by changing the trigger request of DCU ends fault code indications and ECU ends, reduce because urea pump pump stops or failure Make a definite diagnosis the efficiency diagnosis limit for causing and turn round risk so that the diagnosis of urea pump is more more reasonable.
Brief description of the drawings
By reading the detailed description of hereafter preferred embodiment, various other advantages and benefit is common for this area Technical staff will be clear understanding.Accompanying drawing is only used for showing the purpose of preferred embodiment, and is not considered as to the present invention Limitation.And in whole accompanying drawing, identical part is denoted by the same reference numerals.In the accompanying drawings：
Fig. 1 show according to the urea pump of embodiment of the present invention be in fault recognition during in the state of optimization control Method processed.
Fig. 2 shows and stopped in pump according to the urea pump of embodiment of the present invention and fault level is to limit what is turned round after 50 hours Optimal control method under state.
Specific embodiment
The illustrative embodiments of the disclosure are more fully described below with reference to accompanying drawings.Although showing this public affairs in accompanying drawing The illustrative embodiments opened, it being understood, however, that may be realized in various forms the disclosure without the reality that should be illustrated here The mode of applying is limited.Conversely, there is provided these implementation methods are able to be best understood from the disclosure, and can be by this public affairs The scope opened it is complete convey to those skilled in the art.
According to the embodiment of the present invention, a SPN is increased by urea pump not in spray regime, system is being attempted building always Pressure, failure makes a definite diagnosis process, is processed as not associating bright light and triggering ECU not entering line efficiency diagnosis.Specifically, with reference to Fig. 1, it is described Optimal control method comprises the following steps：
S1：DCU judges whether urea pump is in non-ejection state, and result of determination if NO, then terminates flow；If sentenced It is yes to determine result, then further judge whether urea tube or urea box are in just in heated condition；If it is determined that result is no, then Terminate flow；If it is determined that result is yes, then S2 steps are performed；
S2：DCU sends a DCU fault diagnosises sequence number 1 (SPN1) for triggering trouble shooting (DFC) to ECU；
S3：ECU triggers trouble shooting 1 (DFC1) after receiving SPN1；
S4：DFC1 correlation function marker characters FID；
S5：FID association ECU ends, make it not carry out NOx emission efficiency diagnosis, and the warning light request for associating not work Lamp is asked.
Cause pump to stop additionally, increasing another SPN and urea pump breaking down, and torsion is limited after 50 hours, be processed as association Bright light and trigger ECU do not enter line efficiency diagnosis.Specifically, with reference to Fig. 2, the optimal control method comprises the following steps：
S1′：DCU judges whether urea pump breaks down in urea pump causes termination of pumping, and fault level is 50 hours The state of torsion is limited afterwards, and result of determination if NO, then terminates flow；If it is determined that result is yes, then S2 ' steps are performed；
S2′：DCU sends a DCU fault diagnosises sequence number 2 (SPN2) of triggering DFC to ECU；
S3′：ECU triggers trouble shooting 2 (DFC2) after receiving SPN2；
S4′：DFC2 correlation function marker characters FID；
S5′：FID association ECU ends, make it not carry out NOx emission efficiency diagnosis, and the warning light request for associating for 50 is small When after limit torsion bright light request.
Wherein, DFC1 associates a FID with DFC2, and the ECU actions of triggering surpass not carry out NOx emission efficiency and five surpass seven and examine It is disconnected.
The above, the only present invention preferably specific embodiment, but protection scope of the present invention is not limited thereto, Any one skilled in the art the invention discloses technical scope in, the change or replacement that can be readily occurred in, Should all be included within the scope of the present invention.Therefore, protection scope of the present invention should be with the protection model of the claim Enclose and be defined.

Claims (5)

1. the optimal control method that a kind of plug and play urea injection system OBD is monitored, it is characterised in that methods described is included such as Lower step：
S1：DCU judges urea pump working condition, and result of determination then terminates flow if normal injection state；
S2：If S1 steps result of determination is improper spray regime, DCU sends a DCU for triggering trouble shooting (DFC) Fault diagnosis sequence number (SPN) gives ECU；
S3：ECU triggers trouble shooting (DFC) after receiving SPN；
S4：DFC correlation function marker characters FID；
S5：FID association ECU ends, make it not carry out NOxDischarge efficiency is diagnosed and associates corresponding warning light request.
2. the optimal control method that plug and play urea injection system OBD as claimed in claim 1 is monitored, it is characterised in that When the improper spray regime of S2 steps be in failure make a definite diagnosis during state；Now when urea pump is non-ejection state When, further judge whether urea tube or urea box are in just in heated condition, if it is decided that result is no, then terminate flow； If it is determined that result is yes, then the DCU fault diagnosis sequence numbers of the triggering DFC for sending are defined as SPN1；Also, in S3 steps Triggering trouble shooting (DFC) is defined as trouble shooting 1 (DFC1) after ECU receives SPN1；DFC1 correlation functions mark in S4 steps Symbol FID；FID association ECU ends, make it not carry out NO in S5 stepsxDischarge efficiency is diagnosed, and the warning light request for associating is not for Bright light is asked.
3. the optimal control method that plug and play urea injection system OBD as claimed in claim 1 is monitored, it is characterised in that Limit is turned round after the improper spray regime of S2 steps causes termination of pumping for urea pump breaks down and fault level is 50 hours State；The DCU fault diagnosis sequence numbers of the triggering DFC for then sending are defined as SPN2；Also, after ECU receives SPN2 in S3 steps Triggering trouble shooting (DFC) is defined as trouble shooting 2 (DFC2)；DFC2 correlation functions marker character FID in S4 steps；In S5 steps FID association ECU ends, make it not carry out NOxDischarge efficiency is diagnosed, and the warning light request for associating after 50 hours to limit the bright of torsion Lamp is asked.
4. the optimal control method that plug and play urea injection system OBD as claimed in claim 2 is monitored, it is characterised in that When the improper spray regime of S2 steps causes termination of pumping for urea pump breaks down, and fault level is to limit what is turned round after 50 hours State；The DCU fault diagnosis sequence numbers of the triggering DFC for then sending are defined as SPN2；Also, after ECU receives SPN2 in S3 steps Triggering trouble shooting (DFC) is defined as trouble shooting 2 (DFC2)；DFC2 correlation functions marker character FID in S4 steps；In S5 steps FID association ECU ends, make it not carry out NOxDischarge efficiency is diagnosed, and the warning light request for associating after 50 hours to limit the bright of torsion Lamp is asked.
5. the optimal control method that plug and play urea injection system OBD as claimed in claim 4 is monitored, it is characterised in that DFC1 associates a FID with DFC2, and the ECU actions of triggering are not carry out NOxDischarge efficiency surpasses and five surpass seven diagnosis.
CN201611227564.4A 2016-12-27 2016-12-27 A kind of optimal control method of plug and play urea injection system OBD monitoring Active CN106762053B (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107942998A (en) * 2017-11-22 2018-04-20 潍柴动力股份有限公司 A kind of urea consumption deviation fault simulator and analogy method
CN111794836A (en) * 2020-07-06 2020-10-20 无锡沃尔福汽车技术有限公司 Control device capable of being compatible with electric-driven urea pump and air-assisted urea pump
CN116291831A (en) * 2023-04-19 2023-06-23 卓品智能科技无锡股份有限公司 Method and system for preventing false alarm of urea pump driving diagnosis fault

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CN204024774U (en) * 2014-04-16 2014-12-17 浙江海洋学院 A kind of SCR waste gas row controlled based on PLC subtracts device
CN104405484A (en) * 2014-10-24 2015-03-11 上汽依维柯红岩商用车有限公司 Relatively independent selective catalytic reduction system
EP2894310A1 (en) * 2012-08-10 2015-07-15 Toyota Jidosha Kabushiki Kaisha Additive supply device for internal combustion engines
US20150322835A1 (en) * 2014-05-09 2015-11-12 Hyundai Motor Company Urea solution after-treatment system, and method and controller for warning of urea solution state using touch
CN105298606A (en) * 2015-11-12 2016-02-03 潍柴动力股份有限公司 On-off electromagnetic valve failure warning method and device

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2894310A1 (en) * 2012-08-10 2015-07-15 Toyota Jidosha Kabushiki Kaisha Additive supply device for internal combustion engines
CN204024774U (en) * 2014-04-16 2014-12-17 浙江海洋学院 A kind of SCR waste gas row controlled based on PLC subtracts device
US20150322835A1 (en) * 2014-05-09 2015-11-12 Hyundai Motor Company Urea solution after-treatment system, and method and controller for warning of urea solution state using touch
CN104405484A (en) * 2014-10-24 2015-03-11 上汽依维柯红岩商用车有限公司 Relatively independent selective catalytic reduction system
CN105298606A (en) * 2015-11-12 2016-02-03 潍柴动力股份有限公司 On-off electromagnetic valve failure warning method and device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107942998A (en) * 2017-11-22 2018-04-20 潍柴动力股份有限公司 A kind of urea consumption deviation fault simulator and analogy method
CN111794836A (en) * 2020-07-06 2020-10-20 无锡沃尔福汽车技术有限公司 Control device capable of being compatible with electric-driven urea pump and air-assisted urea pump
CN116291831A (en) * 2023-04-19 2023-06-23 卓品智能科技无锡股份有限公司 Method and system for preventing false alarm of urea pump driving diagnosis fault
CN116291831B (en) * 2023-04-19 2023-10-10 卓品智能科技无锡股份有限公司 Method and system for preventing false alarm of urea pump driving diagnosis fault

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