CN115126584A - Removal detection method and device for three-way catalytic converter - Google Patents
Removal detection method and device for three-way catalytic converter Download PDFInfo
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- CN115126584A CN115126584A CN202210854171.5A CN202210854171A CN115126584A CN 115126584 A CN115126584 A CN 115126584A CN 202210854171 A CN202210854171 A CN 202210854171A CN 115126584 A CN115126584 A CN 115126584A
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- 238000001514 detection method Methods 0.000 title claims abstract description 178
- 230000003197 catalytic effect Effects 0.000 title claims abstract description 12
- 239000001301 oxygen Substances 0.000 claims abstract description 180
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 180
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 137
- 239000003054 catalyst Substances 0.000 claims abstract description 124
- 230000008859 change Effects 0.000 claims abstract description 66
- 238000000034 method Methods 0.000 claims abstract description 30
- 230000008569 process Effects 0.000 claims abstract description 16
- 239000000446 fuel Substances 0.000 claims abstract description 14
- 230000000630 rising effect Effects 0.000 claims description 22
- 238000006392 deoxygenation reaction Methods 0.000 claims description 6
- 230000001174 ascending effect Effects 0.000 claims description 5
- 230000002159 abnormal effect Effects 0.000 abstract description 6
- 238000002407 reforming Methods 0.000 abstract description 4
- 238000006243 chemical reaction Methods 0.000 description 8
- 239000007789 gas Substances 0.000 description 8
- 230000007423 decrease Effects 0.000 description 4
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 239000010970 precious metal Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
- F01N11/007—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring oxygen or air concentration downstream of the exhaust apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—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
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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
- F01N2550/24—Determining the presence or absence of an exhaust treating device
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
- F01N2560/025—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting O2, e.g. lambda sensors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
- F01N2570/10—Carbon or carbon oxides
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
- F01N2570/12—Hydrocarbons
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
- F01N2570/14—Nitrogen oxides
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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 application discloses a removal detection method and device of a three-way catalytic converter. The method comprises the following steps: controlling the engine to recover to supply fuel so as to deoxidize the three-way catalyst; in the process of deoxidizing the three-way catalyst, determining the change trend of the detection value of the rear oxygen sensor according to the detection values of the rear oxygen sensor at a plurality of different moments; when the trend of change indicates that there is an inflection point detection value among the post-oxygen-sensor detection values at a plurality of different times, it is determined that the three-way catalyst is removed. In the three-way catalyst deoxidization process, the removal detection of three-way catalyst is carried out in combination with back oxygen sensor detected value, if there is the inflection point detected value in the trend of change that back oxygen sensor detected value corresponds, then can characterize back oxygen sensor through reforming transform, this abnormal conditions of three-way catalyst removal to realize the accurate judgement that whether three-way catalyst was removed.
Description
Technical Field
The application relates to the technical field of automobile engineering, in particular to a removal detection method and device for a three-way catalytic converter.
Background
The three-way catalyst is an exhaust gas treatment device installed in an exhaust gas emission system of an engine, and can convert harmful gases such as carbon monoxide, hydrocarbons, nitrogen oxides and the like in exhaust gas into harmless carbon dioxide, water and nitrogen through oxidation-reduction reaction. However, since the three-way catalyst contains precious metals, the three-way catalyst is often removed by people and the precious metals are stolen, so that the tail gas cannot be normally treated, and environmental pollution is caused.
In response to this problem, whether the three-way catalyst is removed can generally be determined by detecting the conversion efficiency of the three-way catalyst. When the conversion efficiency of the three-way catalyst decreases, it is determined that the three-way catalyst is removed. However, in the case where the three-way catalyst is removed, if the rear oxygen sensor is modified, that is, a cavity is added to the rear oxygen sensor, the conversion efficiency of the three-way catalyst detected thereafter may be similar to the conversion efficiency when the three-way catalyst is installed, so that it is impossible to efficiently and accurately determine whether the three-way catalyst is removed.
Disclosure of Invention
The embodiment of the application provides a removal detection method and device of a three-way catalytic converter, so that whether the three-way catalytic converter is removed or not can be accurately and effectively judged.
In a first aspect, an embodiment of the present application provides a removal detection method for a three-way catalyst, including:
controlling the engine to recover the supply of fuel so as to deoxidize the three-way catalyst;
in the process of deoxidizing the three-way catalyst, determining the change trend of the detection value of the rear oxygen sensor according to the detection values of the rear oxygen sensor at a plurality of different moments;
determining that the three-way catalyst is removed when the trend of change indicates that there is an inflection point detection value among the post-oxygen-sensor detection values at the plurality of different times.
Optionally, determining a trend of change of the post-oxygen sensor detection value according to post-oxygen sensor detection values at a plurality of different moments in time includes:
determining an average value of the post-oxygen sensor detection values at the plurality of different moments according to the post-oxygen sensor detection values at the plurality of different moments;
and determining the change trend according to the average value and a preset reference average value when the three-way catalyst is not removed.
Optionally, the determining the trend of change according to the average value and a preset reference average value when the three-way catalyst is not removed includes:
when the average value is matched with the preset reference average value, determining the variation trend as a steady ascending trend; the stationary rising tendency is used to indicate that the inflection point detection value does not exist in the post-oxygen sensor detection values at the plurality of different times;
when the average value is not matched with the preset reference average value, determining the variation trend as a fluctuation rising trend; the fluctuation rising tendency is used to indicate that the inflection point detection value exists in the post-oxygen sensor detection values at the plurality of different timings.
Optionally, before controlling the engine to resume supplying fuel, the method further comprises:
and controlling the engine to enter a towing working condition so as to store oxygen for the three-way catalytic converter until the detection value of the front oxygen sensor is equal to the preset detection value of the front oxygen sensor.
Optionally, the method further comprises:
and when the detected value of the rear oxygen sensor is greater than or equal to the preset detected value of the rear oxygen sensor, and/or the change trend of the detected value of the front oxygen sensor does not accord with the preset change trend, stopping collecting the detected value of the rear oxygen sensor.
In a second aspect, an embodiment of the present application provides a removal detection device for a three-way catalyst, including:
the deoxygenation control module is used for controlling the engine to recover to supply fuel so as to deoxygenate the three-way catalyst;
the change trend determining module is used for determining the change trend of the detection value of the rear oxygen sensor according to the detection values of the rear oxygen sensor at a plurality of different moments in the oxygen removing process of the three-way catalyst;
a removal detection module that determines that the three-way catalyst is removed when the trend of change indicates that there is an inflection point detection value among the post-oxygen-sensor detection values at the plurality of different times.
Optionally, the change trend determining module specifically includes:
the first determination module is used for determining the average value of the post-oxygen sensor detection values at the different moments according to the post-oxygen sensor detection values at the different moments;
and the second determination module is used for determining the change trend according to the average value and a preset reference average value when the three-way catalyst is not removed.
Optionally, the second determining module is specifically configured to:
when the average value is matched with the preset reference average value, determining the change trend as a steady ascending trend; the stationary rising tendency is used to indicate that the inflection point detection value does not exist in the post-oxygen sensor detection values at the plurality of different times;
when the average value is not matched with the preset reference average value, determining the variation trend as a fluctuation rising trend; the fluctuation rising tendency is used to indicate that the inflection point detection value exists in the post-oxygen sensor detection values at the plurality of different timings.
Optionally, the apparatus further comprises:
and the oxygen storage control module is used for controlling the engine to enter a towing working condition so as to store oxygen for the three-way catalytic converter until the detection value of the front oxygen sensor is equal to the preset detection value of the front oxygen sensor.
Optionally, the apparatus further comprises:
and the data processing module is used for stopping collecting the detection value of the rear oxygen sensor when the detection value of the rear oxygen sensor is greater than or equal to the preset detection value of the rear oxygen sensor and/or the change trend of the detection value of the front oxygen sensor does not accord with the preset change trend.
According to the technical scheme, the embodiment of the application has the following advantages:
in the embodiment of the application, the engine can be controlled to recover the supply of fuel firstly so as to remove oxygen from the three-way catalyst, and then the change trend of the detection value of the rear oxygen sensor is determined according to the detection values of the rear oxygen sensor at a plurality of different moments in the oxygen removing process of the three-way catalyst. In this way, when the trend of change indicates that there is an inflection point detection value among the post-oxygen sensor detection values at a plurality of different times, it can be determined that the three-way catalyst is removed. Because the oxygen content in the tail gas after three way catalyst converter processing can be monitored to back oxygen sensor to the condition that back oxygen sensor is reformed transform can lead to the change of back oxygen sensor detection value to take place to delay, consequently, can be in three way catalyst converter deoxidization in-process, combine back oxygen sensor detection value to carry out removing of three way catalyst converter and detect, if there is the inflection point detected value in the trend of change that back oxygen sensor detection value corresponds, then can characterize back oxygen sensor through reforming transform, this abnormal conditions is removed to three way catalyst converter, thereby realize the accurate judgement that three way catalyst converter was removed.
Drawings
FIG. 1 is a flow chart of a method for detecting removal of a three-way catalyst according to an embodiment of the present disclosure;
FIG. 2 is a flow chart of one implementation of determining a vehicle speed threshold provided by an embodiment of the present application;
fig. 3 is a schematic structural diagram of a removal detection device for a three-way catalyst according to an embodiment of the present disclosure.
Detailed Description
As described hereinbefore, the inventors found in the research for the three-way catalyst that: in order to detect whether the three-way catalyst is manually removed and prevent the precious metal from being stolen, it is generally possible to determine whether the three-way catalyst is removed by detecting the conversion efficiency of the three-way catalyst. When the conversion efficiency of the three-way catalyst decreases, it is determined that the three-way catalyst is removed. However, in the case where the three-way catalyst is removed, if the rear oxygen sensor is modified, that is, a cavity is added to the rear oxygen sensor, the conversion efficiency of the three-way catalyst detected thereafter may be similar to the conversion efficiency when the three-way catalyst is installed, so that it is impossible to efficiently and accurately determine whether the three-way catalyst is removed.
In order to solve the above problem, embodiments of the present application provide a removal detection method of a three-way catalyst. The method can comprise the following steps: the method comprises the steps of firstly controlling an engine to recover to supply fuel so as to remove oxygen from a three-way catalyst, and then determining the change trend of the detection value of a rear oxygen sensor according to the detection values of the rear oxygen sensor at a plurality of different moments in the oxygen removing process of the three-way catalyst. In this way, when the trend of change indicates that there is an inflection point detection value among the post-oxygen sensor detection values at a plurality of different times, it can be determined that the three-way catalyst is removed.
Because the oxygen content in the tail gas after the back oxygen sensor can monitor through three way catalyst converter processing to the condition that back oxygen sensor is reformed transform can lead to the change of back oxygen sensor detection value to take place to delay, consequently, can combine back oxygen sensor detection value to carry out removing of three way catalyst converter and detect, if there is the inflection point detected value in the change trend that back oxygen sensor detection value corresponds, then can characterize back oxygen sensor through reforming transform, this abnormal conditions of three way catalyst converter removal, thereby realize the accurate judgement that three way catalyst converter was removed.
In order to make the technical solutions of the present invention better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Fig. 1 is a flowchart of a removal detection method for a three-way catalyst according to an embodiment of the present disclosure.
Referring to fig. 1, a method for detecting removal of a three-way catalyst provided in an embodiment of the present application may include:
s101: the engine is controlled to resume fueling to deoxygenate the three-way catalyst.
In the embodiment of the application, before the engine is controlled to recover to supply fuel, the engine can be controlled to enter the dragging-backward working condition to store oxygen for the three-way catalytic converter until the detection value of the front oxygen sensor is equal to the detection value of the preset front oxygen sensor. The back-dragging working condition refers to a working condition that the engine of the vehicle has no power demand when the engine runs to a road condition such as a downhill and a slide. When the engine enters the reverse dragging working condition, the engine does not spray oil and does not burn in the engine cylinder, so that air can enter the exhaust pipe, and the catalyst in the three-way catalyst absorbs oxygen to finish oxygen storage. Generally, when the oxygen in the three-way catalyst is in a saturated state, the front oxygen sensor detection value may reach a preset front oxygen sensor detection value, for example, the front oxygen sensor λ value (excess air ratio) may be equal to the preset front oxygen sensor λ value 16.
When the engine is controlled to recover to supply fuel, oxygen in the three-way catalyst can be removed firstly, and the change condition of the detection value of the oxygen sensor is detected in the oxygen removing process, so that the removal detection of the three-way catalyst is completed in the oxygen removing process of the three-way catalyst, and whether the three-way catalyst is removed or not can be accurately and effectively judged on the premise of not influencing the normal operation of the engine.
S102: in the process of removing oxygen by the three-way catalyst, the change trend of the detection value of the rear oxygen sensor is determined according to the detection values of the rear oxygen sensor at a plurality of different moments.
Here, the rear oxygen sensor detection value may be embodied as a rear oxygen voltage. The embodiment of the present application may not be particularly limited with respect to the selection condition of the acquisition time of the detected value of the post-oxygen sensor. For example, the detected values of the rear oxygen sensors at 5 different times may be collected at will from when the detected value of the front oxygen sensor starts to decrease until the detected value of the rear oxygen sensor is greater than or equal to the preset detected value of the rear oxygen sensor.
In addition, for the determination process of the variation trend of the detected value of the post-oxygen sensor, the embodiment of the present application may not be specifically limited. To facilitate understanding, the embodiments of the present application may provide an illustration of many possible implementations.
In one possible implementation, the post-oxygen-sensor detection values at a plurality of different times may be converted into a variation trend of the post-oxygen-sensor detection values by plotting a trend graph. Wherein, the trend chart can be embodied as one or more of a line chart, a graph and a bar chart. In the line graph and the graph, the rising or falling of the line graph and the curve can represent the increasing and decreasing changes of the detected value of the rear oxygen sensor at a plurality of different moments; in the histogram, the increase and decrease of the post-oxygen sensor detection value at a plurality of different times are represented by the length of the bar. Therefore, the change trend of the detection value of the rear oxygen sensor can be intuitively and clearly obtained, and whether the three-way catalyst is removed or not can be conveniently determined subsequently.
In another possible embodiment, the variation trend of the post-oxygen sensor detection value can be analyzed through the average value of the post-oxygen sensor detection values at a plurality of different moments. Thus, a trend graph does not need to be drawn, and the complexity of removal detection of the three-way catalyst is reduced. For technical details, reference is made to the description below.
In addition, in order to improve the accuracy of the detection value of the rear oxygen sensor and further accurately and effectively judge whether the three-way catalyst is removed, the acquisition of the detection value of the rear oxygen sensor can be stopped when the detection value of the rear oxygen sensor is greater than or equal to the preset detection value of the rear oxygen sensor and/or the variation trend of the detection value of the front oxygen sensor does not accord with the preset variation trend. The change trend of the rear oxygen sensor detection value can be influenced by the fact that the rear oxygen sensor detection value is larger than or equal to the preset rear oxygen sensor detection value and the change trend of the front oxygen sensor detection value does not accord with the preset change trend, and therefore when the two conditions occur, the collection of the rear oxygen sensor detection value can be stopped. Further, if the two conditions occur, the collected post-oxygen sensor detection values at a plurality of different times can be cleared after the change trend of the post-oxygen sensor detection values is determined.
S103: when the trend of change indicates that there is an inflection point detection value among the post-oxygen-sensor detection values at a plurality of different times, it is determined that the three-way catalyst is removed.
In the case where the three-way catalyst is mounted, the change in the detected value of the rear oxygen sensor during the engine resumes the supply of fuel to deoxygenate the three-way catalyst will exhibit a tendency to rise smoothly. In the case that the three-way catalyst is removed and a cavity is additionally formed in the rear oxygen sensor, the change of the detection value of the rear oxygen sensor is delayed and instantly rises after the delay in the process of restoring fuel supply to the three-way catalyst to remove oxygen from the three-way catalyst, and the trend of fluctuation is shown. Therefore, if inflection point detection values exist in the detection values of the rear oxygen sensor at different moments, the abnormal condition that the rear oxygen sensor is modified and the three-way catalyst is removed can be represented, and therefore whether the three-way catalyst is removed or not can be accurately judged.
In the embodiment of the present application, the engine may be controlled to resume supplying fuel to deoxygenate the three-way catalyst, and then the variation trend of the detected value of the back oxygen sensor may be determined according to the detected values of the back oxygen sensor at a plurality of different times during the deoxygenation process of the three-way catalyst. In this way, when the trend of change indicates that there is an inflection point detection value among the post-oxygen sensor detection values at a plurality of different times, it can be determined that the three-way catalyst is removed. Because the oxygen content in the tail gas after three way catalyst converter processing can be monitored to back oxygen sensor to the condition that back oxygen sensor is reformed transform can lead to the change of back oxygen sensor detection value to take place to delay, consequently, can be in three way catalyst converter deoxidization in-process, combine back oxygen sensor detection value to carry out removing of three way catalyst converter and detect, if there is the inflection point detected value in the trend of change that back oxygen sensor detection value corresponds, then can characterize back oxygen sensor through reforming transform, this abnormal conditions is removed to three way catalyst converter, thereby realize the accurate judgement that three way catalyst converter was removed.
To facilitate determining whether the three-way catalyst is removed and to reduce the complexity of the removal detection of the three-way catalyst, the embodiments of the present application may provide one possible implementation of determining the change trend of the detected value of the post-oxygen sensor, which may specifically include S201-S202. S201 and S202 are described below with reference to the embodiments and the drawings, respectively.
FIG. 2 is a flowchart of an implementation of determining a vehicle speed threshold according to an embodiment of the present disclosure. As shown in fig. 2, S201 to S202 may specifically include:
s201: an average value of the post-oxygen sensor detection values at a plurality of different times is determined based on the post-oxygen sensor detection values at the plurality of different times.
S202: and determining the variation trend according to the average value and a preset reference average value when the three-way catalyst is not removed.
For the implementation of determining the trend of change, the present application may not be limited in particular, and for the convenience of understanding, the following description is made in conjunction with one possible implementation.
In a possible implementation manner, S202 may specifically include: when the average value is matched with a preset reference average value, determining the variation trend as a stable rising trend; and when the average value does not match with the preset reference average value, determining the variation trend as a fluctuation rising trend. Wherein the steady rising tendency is used to indicate that there is no inflection point detection value among the post-oxygen sensor detection values at a plurality of different times; the fluctuation rising tendency is used to indicate that an inflection point detection value exists in the post-oxygen sensor detection values at a plurality of different timings. In addition, the average value is matched with the preset reference average value, and may be embodied as that the average value is equal to the preset reference average value, or may be embodied as that a negligible error exists between the average value and the preset reference average value; if the average value does not match the preset reference average value, it may be represented that the difference between the preset average values of the average values is large. Since the preset reference average value when the three-way catalyst is not removed is set in advance, when the actual average value matches the preset reference average value, it can be considered that there is no inflection point detection value in the detected values of the rear oxygen sensor at a plurality of different times, that is, the detection trend of the detected value of the rear oxygen sensor is a steady rising trend. When the average value does not match the preset reference average value, it can be considered that there is an inflection point detection value among the post-oxygen sensor detection values at a plurality of different times, that is, the detection trend of the post-oxygen sensor detection value is a rising trend of fluctuation.
It can be known from the above related contents of S201 to S202 that, in the embodiment of the present application, whether the three-way catalyst is removed or not can be conveniently determined by the average value of the detected values of the post-oxygen sensors at a plurality of different times and the preset reference average value when the three-way catalyst is not removed, and a trend graph is not required to be drawn, so that the complexity of the removal detection of the three-way catalyst is reduced.
Based on the removal detection method of the three-way catalyst provided by the embodiment, the embodiment of the application also provides a removal detection device of the three-way catalyst. The removal detection device of the three-way catalyst will be described below with reference to the embodiments and the drawings, respectively.
Fig. 3 is a schematic structural diagram of a removal detection device for a three-way catalyst according to an embodiment of the present disclosure. Referring to fig. 3, a three-way catalyst removal detection apparatus 300 according to an embodiment of the present disclosure may include:
the deoxygenation control module 301 is used for controlling the engine to recover to supply fuel so as to deoxygenate the three-way catalyst;
the change trend determination module 302 is used for determining the change trend of the detection value of the rear oxygen sensor according to the detection values of the rear oxygen sensor at a plurality of different moments in the oxygen removing process of the three-way catalyst;
a removal detection module 303 for determining that the three-way catalyst is removed when the trend of change indicates that there is an inflection point detection value in the post-oxygen sensor detection values at a plurality of different times.
In the embodiment of the application, through the cooperation of the deoxygenation control module 301, the trend change determination module 302 and the removal detection module 303, the removal detection of the three-way catalyst can be performed in combination with the detection value of the rear oxygen sensor during the deoxygenation process of the three-way catalyst, and if an inflection point detection value exists in the change trend corresponding to the detection value of the rear oxygen sensor, the abnormal condition that the rear oxygen sensor is transformed and the three-way catalyst is removed can be represented, so that whether the three-way catalyst is removed or not can be accurately judged.
As an embodiment, in order to accurately and effectively determine whether the three-way catalyst is removed, the trend determining module 302 specifically includes:
the first determination module is used for determining the average value of the post-oxygen sensor detection values at a plurality of different moments according to the post-oxygen sensor detection values at the plurality of different moments;
and the second determining module is used for determining the change trend according to the average value and a preset reference average value when the three-way catalyst is not removed.
As an embodiment, in order to accurately and efficiently determine whether the three-way catalyst is removed, the second determination module is specifically configured to:
when the average value is matched with a preset reference average value, determining the variation trend as a stable ascending trend; the steady rising trend is used for representing that inflection point detection values do not exist in the post-oxygen sensor detection values at a plurality of different moments;
when the average value is not matched with the preset reference average value, determining the variation trend as a fluctuation rising trend; the fluctuation rising tendency is used to indicate that an inflection point detection value exists in the post-oxygen sensor detection values at a plurality of different timings.
As an embodiment, in order to accurately and effectively determine whether the three-way catalyst is removed, the three-way catalyst removal detection apparatus 300 may further include:
and the oxygen storage control module is used for controlling the engine to enter a towing working condition so as to store oxygen for the three-way catalytic converter until the detection value of the front oxygen sensor is equal to the preset detection value of the front oxygen sensor.
As an embodiment, in order to accurately and efficiently determine whether the three-way catalyst is removed, the three-way catalyst removal detection apparatus 300 may further include:
and the data processing module is used for stopping collecting the detection value of the rear oxygen sensor when the detection value of the rear oxygen sensor is greater than or equal to the preset detection value of the rear oxygen sensor and/or the change trend of the detection value of the front oxygen sensor does not accord with the preset change trend.
The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (10)
1. A removal detection method of a three-way catalyst, characterized by comprising:
controlling the engine to recover the supply of fuel so as to deoxidize the three-way catalyst;
in the process of deoxidizing the three-way catalyst, determining the change trend of the detection value of the rear oxygen sensor according to the detection values of the rear oxygen sensor at a plurality of different moments;
determining that the three-way catalyst is removed when the trend of change indicates that there is an inflection point detection value among the post-oxygen-sensor detection values at the plurality of different times.
2. The method of claim 1, wherein determining a trend of the change in the post-oxygen sensor detection value based on post-oxygen sensor detection values at a plurality of different times comprises:
determining an average value of the post-oxygen sensor detection values at the different moments according to the post-oxygen sensor detection values at the different moments;
and determining the change trend according to the average value and a preset reference average value when the three-way catalyst is not removed.
3. The method according to claim 2, wherein the determining the trend of change from the average value and a preset reference average value when the three-way catalyst is not removed comprises:
when the average value is matched with the preset reference average value, determining the change trend as a steady ascending trend; the steady rising tendency is used to indicate that the inflection point detection value is not present in the post-oxygen sensor detection values at the plurality of different times;
when the average value is not matched with the preset reference average value, determining the change trend as a fluctuation rising trend; the rising trend of the fluctuation is used to indicate that the inflection point detection value exists in the post-oxygen sensor detection values at the plurality of different times.
4. The method of any of claims 1-3, wherein before controlling the engine to resume fueling, the method further comprises:
and controlling the engine to enter a towing working condition so as to store oxygen for the three-way catalytic converter until the detection value of the front oxygen sensor is equal to the preset detection value of the front oxygen sensor.
5. The method according to any one of claims 1 to 3, further comprising:
and when the detection value of the rear oxygen sensor is greater than or equal to the preset detection value of the rear oxygen sensor, and/or the change trend of the detection value of the front oxygen sensor does not accord with the preset change trend, stopping collecting the detection value of the rear oxygen sensor.
6. A removal detection device of a three-way catalyst, characterized by comprising:
the deoxygenation control module is used for controlling the engine to recover to supply fuel so as to deoxygenate the three-way catalyst;
the change trend determining module is used for determining the change trend of the detection value of the rear oxygen sensor according to the detection values of the rear oxygen sensor at a plurality of different moments in the oxygen removing process of the three-way catalyst;
a removal detection module that determines that the three-way catalyst is removed when the trend of change indicates that there is an inflection point detection value among the post-oxygen-sensor detection values at the plurality of different times.
7. The apparatus according to claim 6, wherein the trend determining module specifically includes:
the first determination module is used for determining the average value of the post-oxygen sensor detection values at the different moments according to the post-oxygen sensor detection values at the different moments;
and the second determination module is used for determining the change trend according to the average value and a preset reference average value when the three-way catalyst is not removed.
8. The apparatus of claim 7, wherein the second determining module is specifically configured to:
when the average value is matched with the preset reference average value, determining the change trend as a steady ascending trend; the steady rising tendency is used to indicate that the inflection point detection value is not present in the post-oxygen sensor detection values at the plurality of different times;
when the average value is not matched with the preset reference average value, determining the change trend as a fluctuation rising trend; the fluctuation rising tendency is used to indicate that the inflection point detection value exists in the post-oxygen sensor detection values at the plurality of different timings.
9. The apparatus of any one of claims 6 to 8, further comprising:
and the oxygen storage control module is used for controlling the engine to enter a towing working condition so as to store oxygen for the three-way catalytic converter until the detection value of the front oxygen sensor is equal to the preset detection value of the front oxygen sensor.
10. The apparatus of any one of claims 6 to 8, further comprising:
and the data processing module is used for stopping collecting the detection value of the rear oxygen sensor when the detection value of the rear oxygen sensor is greater than or equal to the preset detection value of the rear oxygen sensor and/or the change trend of the detection value of the front oxygen sensor does not accord with the preset change trend.
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