CN108930578B - DOC poisoning detection and protection method - Google Patents
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- CN108930578B CN108930578B CN201810680127.0A CN201810680127A CN108930578B CN 108930578 B CN108930578 B CN 108930578B CN 201810680127 A CN201810680127 A CN 201810680127A CN 108930578 B CN108930578 B CN 108930578B
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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
- F01N2550/00—Monitoring or diagnosing the deterioration of exhaust systems
- F01N2550/02—Catalytic activity of catalytic converters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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Abstract
The invention relates to the technical field of aftertreatment of engine tail gas, in particular to a DOC poisoning detection and protection method. The invention aims to solve the technical problem that the use safety of an engine is damaged after DOC poisoning. To this end, the invention provides a DOC poisoning detection and protection method, which comprises the following steps: s12: spraying a preset amount of diesel oil into the DOC to enable the preset amount of diesel oil to be combusted in the DOC; s13: detecting an actual heat value generated after a preset amount of diesel oil is combusted in a DOC; s14: and comparing the actual heat value with a theoretical heat value generated after diesel oil with a preset amount is combusted in the DOC, and determining that the DOC is poisoned when the actual heat value is smaller than the theoretical heat value and the difference value between the theoretical heat value and the actual heat value is larger than a preset difference value, or determining that the DOC is normal. The method determines whether the preset amount of diesel oil can be completely combusted in the DOC or not through an actual calorific value generated by combustion of the preset amount of diesel oil in the DOC, and determines that the DOC is poisoned when the preset amount of diesel oil cannot be completely combusted in the DOC.
Description
Technical Field
The invention relates to the technical field of aftertreatment of engine tail gas, in particular to a DOC poisoning detection and protection method.
Background
This section provides background information related to the present disclosure only and is not necessarily prior art.
In large and medium-sized cities in China, automobile exhaust emission becomes a main air pollution source, in order to reduce the influence of automobile exhaust on the environment, exhaust discharged by an engine can be discharged into the atmosphere after sequentially passing through a Diesel Oxidation Catalyst (DOC), a Diesel Particulate Filter (DPF) and a Selective Catalytic Reduction (SCR) Catalyst, so that the influence of the automobile exhaust on the environment is reduced, wherein the DOC is placed in front of the DPF and the SCR Catalyst and used for converting carbon monoxide (CO) and Hydrocarbon (HC) in the exhaust into harmless water (H)20) And carbon dioxide (CO)2) And oxidizing nitrogen monoxide (NO) in the exhaust gas to nitrogen dioxide (NO)2) Accelerating the conversion speed and efficiency of the subsequent SCR to nitrogen oxides (NOx), and catalytically oxidizing fuel injected to the DOC, and increasing the temperature in the DOC by combustion of the fuel, thereby making early preparation for regeneration of the DOC, but if the engine is usedThe long-term use of diesel oil and engine oil with high sulfur content can lead to SO in tail gas2SO formation catalyzed by platinum, palladium, etc. in DOC3，SO3Production of H by reaction with water2SO4，H2SO4With NH3Reaction to produce (NH) which is not readily decomposed4)2SO4，(NH4)2SO4Attach to and lead to DOC to appear "poisoning" phenomenon in the DOC, make catalytic efficiency such as platinum in the DOC, palladium descend, catalytic efficiency such as platinum, palladium descend and lead to diesel oil can not fully burn in the DOC, thereby cause DOC aftertreatment efficiency to descend, long-time back still can cause aftertreatment blocking phenomenon, threaten the safety in utilization of engine, and current technique is only to DOC carry out the detection whether "poisoning", it carries out desulfurization treatment and carries out effectual safeguard measure to the engine to DOC after "poisoning", consequently, the potential safety hazard that aftertreatment blocking phenomenon and engine exist after DOC "poisoning" that causes is got rid of to the DOC.
Disclosure of Invention
The present invention is directed to solving at least one of the problems set forth above, and the object is achieved by the following means.
The invention provides a DOC poisoning detection and protection method, which comprises the following steps: s12: spraying a preset amount of diesel oil into the DOC to enable the preset amount of diesel oil to be combusted in the DOC; s13: detecting an actual heat value generated after a preset amount of diesel oil is combusted in a DOC; s14: and comparing the actual heat value with a theoretical heat value generated after diesel oil with a preset amount is combusted in the DOC, and determining that the DOC is poisoned when the actual heat value is smaller than the theoretical heat value and the difference value between the theoretical heat value and the actual heat value is larger than a preset difference value, or determining that the DOC is normal.
Preferably, step S12 is preceded by: s11: calibrating a preset time interval or a preset mileage interval for detecting the DOC, and executing step S12 after every preset time interval or preset mileage interval.
Preferably, step S14 is followed by: s15: reporting a DOC inefficiency fault after determining that the DOC is poisoned and triggering a DOC inefficiency alarm.
Preferably, step S15 is followed by: s16: and when the DOC low-efficiency alarm is triggered, performing active regeneration treatment on the DOC, and performing desulfurization treatment on the DOC through active regeneration.
Preferably, step S16 is followed by: s17: after the DOC finishes desulfurization treatment, the efficiency value of the DOC is detected, and when the efficiency value of the DOC does not reach a first preset efficiency value, the DOC is judged to fail desulfurization treatment and trigger failure alarm of desulfurization treatment.
Preferably, an SCR is provided after the DOC, and after the step S16, the method further includes: s18: after DOC accomplished desulfurization treatment, detect SCR's efficiency value, when SCR's efficiency value did not reach the second and predetermine the efficiency value, judge the desulfurization treatment failure that goes on DOC and trigger desulfurization treatment failure alarm.
Preferably, detecting the efficiency value of the SCR comprises: when the SCR carries out aftertreatment on engine exhaust, the amount of nitrogen oxide actually participating in reaction in the SCR is detected, and the efficiency value of the SCR is determined according to the ratio of the amount of nitrogen oxide actually participating in reaction to the amount of nitrogen oxide theoretically participating in reaction.
Preferably, a DPF is further disposed between the DOC and the SCR, and after step S16, the method further includes: s19: after the DOC finishes desulfurization treatment, detecting the upstream temperature value of the DPF, and when the upstream temperature value of the DPF does not reach the preset temperature value, judging that the desulfurization treatment performed on the DOC fails and triggering a desulfurization treatment failure alarm.
Preferably, step S16 is followed by: s20: after the DOC finishes desulfurization treatment, when the efficiency value of the DOC reaches a first preset efficiency value and the efficiency value of the SCR reaches a second preset efficiency value and the upstream temperature value of the DPF reaches a preset temperature value, determining that desulfurization treatment carried out on the DOC is successful, and otherwise, determining that desulfurization treatment carried out on the DOC is failed and triggering desulfurization treatment failure alarm.
Preferably, step S20 is followed by: s21: and when the alarm of desulfurization treatment failure is triggered, carrying out torque limiting operation on the engine after a preset time, and sending out an alarm for maintaining or replacing the DOC.
As can be understood by those skilled in the art, in the technical scheme of the invention, a preset amount of diesel oil is injected into the DOC to be combusted in the DOC, whether the preset amount of diesel oil can be completely combusted in the DOC is determined according to an actual calorific value generated by combustion of the preset amount of diesel oil in the DOC, and when the preset amount of diesel oil cannot be completely combusted in the DOC, the DOC is determined to have a poisoning phenomenon. Specifically, the invention triggers the active detection of the DOC once every a preset time interval or a preset mileage interval, injects a preset amount of diesel oil into the DOC through a rear injection of an engine or a seventh oil injection nozzle to be combusted in the DOC, detects an actual heat value generated by the combustion of the preset amount of diesel oil in the DOC through a temperature sensor in the DOC after the combustion of the preset amount of diesel oil in the DOC, compares the actual heat value with a theoretical heat value generated theoretically by the combustion of the preset amount of diesel oil in the DOC, determines that the DOC is poisoned to cause that the preset amount of diesel oil can not be completely combusted in the DOC when the actual heat value is smaller than the theoretical heat value and the difference between the theoretical heat value and the actual heat value is larger than a preset difference, determines that the DOC is poisoned to cause that the preset amount of diesel oil can not be completely combusted in the DOC, and reports a low-efficiency fault of the DOC, and sends an instruction of the active regeneration treatment of the, the DOC is actively regenerated to realize the desulfurization treatment of the DOC, so that the harm to the engine caused by the reduction of the aftertreatment efficiency of the engine due to DOC poisoning is reduced.
Further, after the DOC finishes the active regeneration treatment, the desulfurization effect of the DOC is detected, if the efficiency of the DOC and the efficiency of the SCR meet the requirements and the upstream temperature of the DPF can meet the preset temperature value in the regeneration treatment process of the DOC, the DOC is determined to be successfully desulfurized through the active regeneration treatment, if the efficiency of the DOC or the efficiency of the SCR does not meet the requirements or the upstream temperature of the DPF in the regeneration treatment process of the DOC does not meet the preset temperature value, the DOC is determined to fail desulfurization through the active regeneration treatment and trigger desulfurization failure alarm, and the controller sends a torque limiting instruction to the engine after the preset time and prompts a driver to a specified service station to further maintain or replace the DOC.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 is a schematic flow chart of a DOC poisoning detection and protection method according to an embodiment of the present invention.
Fig. 2 is a schematic flow chart of a DOC poisoning detection and protection method according to another embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that the description of the invention by applying the DOC poisoning detection and protection method to the diesel engine is only a preferred embodiment, and does not limit the application scope of the DOC poisoning detection and protection method of the invention, for example, the DOC poisoning detection and protection method of the invention may also be applied to other engines with similar structures, and such changes do not depart from the application scope of the DOC poisoning detection and protection method of the invention.
Fig. 1 is a schematic flow chart of a DOC poisoning detection and protection method according to an embodiment of the present invention.
As shown in fig. 1, the present invention provides a method for detecting and protecting DOC poisoning, which comprises the following steps: s12: spraying a preset amount of diesel oil into the DOC to enable the preset amount of diesel oil to be combusted with oxygen in the DOC; s13: detecting an actual heat value generated after a preset amount of diesel oil is combusted in a DOC; s14: and comparing the actual heat value with a theoretical heat value generated after diesel oil with a preset amount is combusted in the DOC, and determining that the DOC is poisoned when the actual heat value is smaller than the theoretical heat value and the difference value between the theoretical heat value and the actual heat value is larger than a preset difference value, or determining that the DOC is normal. According to the technical scheme, the diesel oil with the preset amount is sprayed into the DOC to be combusted in the DOC, whether the diesel oil with the preset amount can be completely combusted in the DOC is determined according to an actual heat value generated by combustion of the diesel oil with the preset amount in the DOC, and when the diesel oil with the preset amount cannot be completely combusted in the DOC, the DOC is determined to have a poisoning phenomenon. Specifically, the method comprises the steps of triggering active detection on the DOC once every preset time interval or preset mileage interval, injecting preset amount of diesel oil into the DOC through a rear injection of an engine or a seventh oil injection nozzle to be combusted in the DOC, detecting an actual heat value generated by combustion of the preset amount of diesel oil in the DOC through a temperature sensor in the DOC after the preset amount of diesel oil is combusted in the DOC, comparing the actual heat value with a theoretical heat value generated by combustion of the preset amount of diesel oil in the DOC theoretically, and determining that the DOC is poisoned to cause that the preset amount of diesel oil cannot be completely combusted in the DOC when the actual heat value is smaller than the theoretical heat value and a difference value between the theoretical heat value and the actual heat value is larger than a preset difference value, wherein the controller determines that the DOC is poisoned.
Fig. 2 is a schematic flow chart of a DOC poisoning detection and protection method according to another embodiment of the present invention.
As shown in fig. 2, according to an embodiment of the present invention, a method for detecting and protecting DOC poisoning includes the following steps: s11: calibrating a preset time interval or a preset mileage interval for detecting the DOC, wherein the preset time interval or the preset mileage interval can be calibrated according to the performance parameters of the DOC and the engine and by referring to the past experience data, or the preset time interval and the preset mileage interval are obtained through a simulation experiment, specific data are not repeated here, and the step S12 is executed after every preset time interval or preset mileage interval: injecting a preset amount of diesel oil into the DOC to enable the preset amount of diesel oil to be combusted in the DOC, wherein the step can adopt an active regeneration treatment step in the prior art, that is, injecting the preset amount of diesel oil into the DOC through an engine post injection or a seventh oil injection nozzle to enable the diesel oil to be combusted in the DOC, and after the preset amount of diesel oil is combusted in the DOC, executing the step S13: detecting an actual heat value generated by combustion of a preset amount of diesel oil in the DOC through a temperature sensor in the DOC; controller rootAnd executing step S14 after detecting the actual calorific value generated by combustion of a preset amount of diesel oil in the DOC according to the temperature sensor in the DOC, wherein the step S14 specifically comprises the step S141: comparing whether the actual heat value is smaller than a theoretical heat value generated by combustion of diesel oil with a preset amount in the DOC, and executing the step S143 when the actual heat value is larger than or equal to the theoretical heat value: determining that the DOC is normal and re-performing step S11, performing step S142 when the actual calorific value is less than the theoretical calorific value: comparing whether the difference value between the theoretical heat value and the actual heat value is greater than a preset difference value, wherein the preset difference value can be obtained according to past empirical data or through a simulation experiment, and executing the step S143 when the difference value between the theoretical heat value and the actual heat value is less than or equal to the preset difference value: determining that the DOC is normal and re-executing step S11; when the difference between the theoretical calorific value and the actual calorific value is greater than a preset difference, step S15 is performed: determining DOC faults, reporting efficiency faults of the DOC and triggering efficiency alarm of the DOC, wherein the efficiency faults of the DOC and the efficiency alarm of the DOC can be displayed through a control panel or played through a vehicle-mounted sound device; when the DOC inefficiency alarm is triggered, the step S16 is executed: when the DOC low-efficiency alarm is triggered, the DOC is subjected to active regeneration treatment, and the DOC is subjected to desulfurization treatment through active regeneration, specifically, the temperature in the DOC is increased through active regeneration, and (NH4)2SO4 attached to catalysts such as platinum, palladium and the like in the DOC is decomposed and falls off through high temperature, SO that the catalytic efficiency of the catalysts such as platinum, palladium and the like in the DOC is improved, and the desulfurization treatment of the DOC is completed; when the DOC completes the active regeneration and desulfurization processes, step S17 is executed: after the DOC finishes desulfurization treatment, detecting the efficiency value of the DOC, and when the efficiency value of the DOC does not reach a first preset efficiency value, judging that the desulfurization treatment on the DOC fails and triggering a desulfurization treatment failure alarm, wherein the efficiency value of the DOC is detected to be determined by the actual heat value generated in the DOC by the preset amount of diesel oil, the first preset efficiency value is determined by the theoretical heat value generated in the DOC by the preset amount of diesel oil, and whether the preset amount of diesel oil can be sufficiently combusted in the DOC is determined according to the actual heat value so as to detect whether the DOC is successfully desulfurized; the desulfurization of DOC is detected by the step S17 and the desulfurization is performed simultaneously or after the desulfurization of DOC is detected by the step S17Step S18: after the DOC finishes desulfurization treatment, the efficiency value of the SCR is detected, when the efficiency value of the SCR does not reach a second preset efficiency value, the failure of desulfurization treatment on the DOC is judged, and a failure alarm of desulfurization treatment is triggered, wherein the DOC is mainly used for converting carbon monoxide (CO) and Hydrocarbon (HC) in exhaust gas into harmless water (H)20) And carbon dioxide (CO)2) And oxidizing nitrogen oxides such as Nitric Oxide (NO) in the exhaust gas to nitrogen dioxide (NO)2) Therefore, detecting the amount of the nitrogen oxide actually participating in the reaction in the SCR can indirectly react the efficiency value of the SCR when the SCR carries out aftertreatment on the engine exhaust, determining the efficiency value of the SCR according to the amount of the nitrogen oxide actually participating in the reaction, determining a second preset efficiency value according to the amount of the nitrogen oxide theoretically participating in the reaction, determining the efficiency value of the SCR according to the ratio of the amount of the nitrogen oxide actually participating in the reaction to the amount of the nitrogen oxide theoretically participating in the reaction, specifically, arranging nitrogen oxide sensors at the front end and the rear end of the SCR, detecting the amount of the nitrogen oxide passing through the front end and the rear end of the SCR through the nitrogen oxide sensors, and determining the amount of the nitrogen oxide actually participating in the reaction in the SCR according to the amount of the nitrogen oxide passing through the front end and the rear; simultaneously with the detection of whether the DOC desulfurization is successful or not through the steps S17 and S18, or after the detection of the DOC desulfurization success through the steps S17 and S18, the step S19 is executed: detecting an upstream temperature value of the DPF by the DOC after the DOC finishes desulfurization treatment, and when the upstream temperature value of the DPF does not reach a preset temperature value, judging that the desulfurization treatment on the DOC fails and triggering a desulfurization treatment failure alarm; when the step S17, the step S18, and the step S19 complete the detection of the success or failure of DOC desulfurization, the step S20 includes the step S201 of performing the step S20: when the DOC finishes the desulfurization treatment, the efficiency value of the DOC reaches the second valueWhen the efficiency value of a preset efficiency value and the SCR reaches a second preset efficiency value and the upstream temperature value of the DPF reaches a preset temperature value, it is determined that the desulfurization treatment performed on the DOC is successful, and the execution step S11 is returned, otherwise, the step S202 is executed: determining that the desulfurization treatment performed on the DOC fails and triggering a desulfurization treatment failure alarm; when the desulfurization process failure alarm for DOC is triggered, step S21 is executed: and when the alarm of desulfurization treatment failure is triggered, carrying out torque limiting operation on the engine after a preset time, sending out an alarm for testing or replacing the DOC, and prompting a driver to go to a specified service station to further maintain or replace the DOC.
It should be noted that, in the DOC poisoning detection and protection method of the present invention, step S17, step S18, and step S19 may be arranged in parallel after step S16, that is, after the DOC completes the desulfurization process of step S16, step S17, step S18, and step S19 detect the desulfurization effect of the DOC at the same time, when at least one of step S17, step S18, and step S19 detects the DOC desulfurization failure, it is determined that the DOC desulfurization has failed, when step S17, step S18, and step S19 all detect that the DOC desulfurization has succeeded, further, step S17, step S18, and step S19 may be arranged in sequence after step S16, that is, after the DOC completes the desulfurization process of step S16, the desulfurization effect of the DOC is detected first by step S17, when step S17 detects the DOC desulfurization failure, when step S17 detects the DOC desulfurization failure, step S18 continues to detect the DOC desulfurization failure, and step S18 determines that the DOC desulfurization has failed, and step S18 detects the DOC desulfurization failure, continuing to execute the step S19 after the DOC desulfurization is successfully detected in the step S18, determining that the DOC desulfurization is failed after the DOC desulfurization is failed in the step S19, determining that the DOC desulfurization is successful after the DOC desulfurization is successfully detected in the step S19, and then returning to execute the step S11 again: and detecting whether the DOC is poisoned or not at preset time intervals or preset mileage intervals.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (3)
1. The DOC poisoning detection and protection method is characterized in that an SCR is arranged behind the DOC, a DPF is further arranged between the DOC and the SCR, and the DOC poisoning detection and protection method comprises the following steps:
s11: calibrating a preset time interval or a preset mileage interval for detecting the DOC, and executing the step S12 after every other preset time interval or preset mileage interval;
s12: injecting a preset amount of diesel into the DOC so that the preset amount of diesel is combusted in the DOC;
s13: detecting an actual calorific value generated after the preset amount of diesel oil is combusted in the DOC;
s14: comparing the actual heat value with a theoretical heat value generated after the diesel oil with the preset amount is combusted in the DOC, and determining that the DOC is poisoned when the actual heat value is smaller than the theoretical heat value and the difference value between the theoretical heat value and the actual heat value is larger than a preset difference value, otherwise, determining that the DOC is normal;
s15: reporting a low efficiency fault of the DOC and triggering a low efficiency alarm of the DOC after the DOC is determined to be poisoned;
s16: performing active regeneration treatment on the DOC after the inefficiency alarm of the DOC is triggered, and performing desulfurization treatment on the DOC through active regeneration;
s17: after the DOC completes desulfurization treatment, detecting the efficiency value of the DOC, and when the efficiency value of the DOC does not reach a first preset efficiency value, judging that the desulfurization treatment on the DOC fails and triggering a desulfurization treatment failure alarm;
s18: after DOC accomplished desulfurization treatment, detect SCR's efficiency value works as SCR's efficiency value does not reach the second when predetermineeing efficiency value, judges right the desulfurization treatment failure that DOC goes on triggers desulfurization treatment failure alarm detects SCR's efficiency value includes: detecting the amount of nitrogen oxide actually participating in reaction in the SCR when the SCR carries out aftertreatment on the engine tail gas, and determining the efficiency value of the SCR according to the ratio of the amount of nitrogen oxide actually participating in reaction to the amount of nitrogen oxide theoretically participating in reaction;
s19: after the DOC finishes desulfurization treatment, detecting an upstream temperature value of the DPF, and when the upstream temperature value of the DPF does not reach a preset temperature value, judging that desulfurization treatment carried out by the DOC fails and triggering a desulfurization treatment failure alarm.
2. The method for detecting and protecting against DOC poisoning according to claim 1, further comprising after step S16:
s20: after the desulfurization treatment was accomplished to DOC, the efficiency value of DOC reaches first predetermine efficiency value just SCR's efficiency value reaches the second predetermines efficiency value just DPF the upstream temperature value reaches when predetermineeing the temperature value, it is right to judge the desulfurization treatment that DOC goes on succeeds, otherwise, judges right the desulfurization treatment that DOC goes on fails and triggers desulfurization treatment failure alarm.
3. The DOC poisoning detection and protection method according to claim 2, further comprising, after step S20:
s21: and when the alarm of the desulfurization treatment failure is triggered, performing torque limiting operation on the engine after a preset time, and sending an alarm for maintaining or replacing the DOC.
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| US7591132B2 (en) * | 2006-09-20 | 2009-09-22 | Gm Global Technology Operations, Inc. | Apparatus and method to inject a reductant into an exhaust gas feedstream |
| US7469531B2 (en) * | 2006-09-20 | 2008-12-30 | Gm Global Technology Operations, Inc. | Method and apparatus to control injection of a reductant into an exhaust gas feedstream |
| EP2625397A1 (en) * | 2010-10-04 | 2013-08-14 | International Engine Intellectual Property Company, LLC | Diagnostics for hydrocarbon injection for filter regeneration |
| JP5760423B2 (en) * | 2010-12-16 | 2015-08-12 | いすゞ自動車株式会社 | NOx purification rate reduction cause diagnosis device |
| EP2681422B1 (en) * | 2011-03-02 | 2015-06-03 | Peugeot Citroën Automobiles SA | Method for running diagnostics on an oxidation catalyst by measuring the level of nitrogen oxides downstream of a selective catalytic reduction member |
| EP2861840B1 (en) * | 2012-06-13 | 2018-08-01 | Mack Trucks, Inc. | Method for monitoring components in an exhaust after treatment system, an exhaust after treatment system, and a controller for an exhaust after treatment system |
| EP2864601B1 (en) * | 2012-06-21 | 2020-09-16 | Mack Trucks, Inc. | Method for detecting abnormally frequent diesel particulate filter regeneration, engine and exhaust after treatment system, and warning system and method |
| KR101406419B1 (en) * | 2012-08-22 | 2014-06-13 | 현대자동차주식회사 | Determination of doc regeneration cycle |
| JP6213118B2 (en) * | 2013-10-04 | 2017-10-18 | いすゞ自動車株式会社 | Diagnostic equipment |
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| US9784166B2 (en) * | 2014-12-30 | 2017-10-10 | Cummins Inc. | NOx sensor diagnostic for an exhaust aftertreatment system |
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| EP3067526B1 (en) * | 2015-11-25 | 2018-09-12 | Komatsu Ltd. | Exhaust gas purification device |
| CN107044325B (en) * | 2017-06-15 | 2019-06-28 | 无锡威孚力达催化净化器有限责任公司 | The monitoring method, monitoring device and system of DOC temperature rise model in diesel engine after treatment |
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