CN115126584B - Method and device for removing and detecting three-way catalyst - Google Patents
Method and device for removing and detecting three-way catalyst Download PDFInfo
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- CN115126584B CN115126584B CN202210854171.5A CN202210854171A CN115126584B CN 115126584 B CN115126584 B CN 115126584B CN 202210854171 A CN202210854171 A CN 202210854171A CN 115126584 B CN115126584 B CN 115126584B
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- 239000003054 catalyst Substances 0.000 title claims abstract description 135
- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000001514 detection method Methods 0.000 claims abstract description 180
- 239000001301 oxygen Substances 0.000 claims abstract description 177
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 177
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 124
- 230000008859 change Effects 0.000 claims abstract description 79
- 230000008569 process Effects 0.000 claims abstract description 17
- 239000000446 fuel Substances 0.000 claims abstract description 16
- 230000000630 rising effect Effects 0.000 claims description 22
- 238000006392 deoxygenation reaction Methods 0.000 claims description 8
- 230000002159 abnormal effect Effects 0.000 abstract description 5
- 239000007789 gas Substances 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 6
- 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
- 230000001174 ascending effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 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
- 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
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- 238000002407 reforming Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910001868 water Inorganic materials 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- 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
-
- 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
- F01N2550/00—Monitoring or diagnosing the deterioration of exhaust systems
- F01N2550/24—Determining the presence or absence of an exhaust treating device
-
- 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
-
- 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 method and a device for detecting removal of a three-way catalyst. The method comprises the following steps: controlling the engine to resume supplying fuel to deoxidize the three-way catalyst; in the deoxidation process of 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 change trend 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 deoxidizing process of the three-way catalyst, the removal detection of the three-way catalyst is carried out by combining the detection value of the rear oxygen sensor, if the inflection point detection value exists in the change trend corresponding to the detection value of the rear oxygen sensor, the three-way catalyst is removed under the abnormal condition that the rear oxygen sensor is transformed can be represented, so that the accurate judgment of whether the three-way catalyst is removed or not is realized.
Description
Technical Field
The application relates to the technical field of automobile engineering, in particular to a method and a device for removing and detecting a three-way catalyst.
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, hydrocarbon, nitrogen oxides and the like in the 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 to steal precious metals, so that the tail gas cannot be treated normally, and environmental pollution is caused.
For this problem, 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 is lowered, it is determined that the three-way catalyst is removed. However, in the case where the three-way catalyst is removed, if the post-oxygen sensor is modified, that is, a cavity is added to the post-oxygen sensor, the conversion efficiency of the three-way catalyst detected thereafter may be similar to that when the three-way catalyst is mounted, resulting in an inability to effectively and accurately determine whether the three-way catalyst is removed.
Disclosure of Invention
The embodiment of the application provides a method and a device for detecting removal of a three-way catalyst, so as to accurately and effectively judge whether the three-way catalyst is removed.
In a first aspect, an embodiment of the present application provides a removal detection method of a three-way catalyst, including:
Controlling the engine to resume supplying fuel to deoxidize the three-way catalyst;
In the deoxidation process of 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;
And determining that the three-way catalyst is removed when the change trend indicates that an inflection point detection value exists in the post-oxygen sensor detection values at the plurality of different moments.
Optionally, determining the trend of change of the post-oxygen sensor detection value according to the post-oxygen sensor detection values at a plurality of different moments includes:
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.
Optionally, the determining the change trend 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 change trend as a stable rising trend; the stationary upward trend is used for indicating that the inflection point detection value does not exist in the post-oxygen sensor detection values at the plurality of different moments;
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 for indicating that the inflection point detection value exists in the post-oxygen sensor detection values at the plurality of different moments.
Optionally, before the controlling the engine resumes supplying fuel, the method further comprises:
And controlling the engine to enter a reverse-dragging working condition so as to store oxygen for the three-way catalyst until the detection value of the front oxygen sensor is equal to the detection value of the preset front oxygen sensor.
Optionally, the method further comprises:
and stopping collecting the detection value of the rear oxygen sensor when the detection value of the rear oxygen sensor is larger than or equal to a 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.
In a second aspect, an embodiment of the present application provides a removal detection device of a three-way catalyst, including:
the deoxygenation control module is used for controlling the engine to resume supplying 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 deoxidation process of the three-way catalyst;
And the removal detection module is used for determining that the three-way catalyst is removed when the change trend indicates that inflection point detection values exist in the detection values of the rear oxygen sensors at the plurality of different moments.
Optionally, the change trend determining module specifically includes:
the first determining module is used for 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 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.
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 stable rising trend; the stationary upward trend is used for indicating that the inflection point detection value does not exist in the post-oxygen sensor detection values at the plurality of different moments;
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 for indicating that the inflection point detection value exists in the post-oxygen sensor detection values at the plurality of different moments.
Optionally, the apparatus further comprises:
and the oxygen storage control module is used for controlling the engine to enter a reverse-dragging working condition so as to store oxygen for the three-way catalyst until the detection value of the front oxygen sensor is equal to the detection value of the preset 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 larger 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.
From the above technical solutions, the embodiment of the present application has the following advantages:
In the embodiment of the application, the engine can be controlled to resume supplying fuel so as to deoxidize the three-way catalyst, and then in the deoxidizing process of 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. In this way, when the change trend 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 three-way catalyst treatment can be monitored to the back oxygen sensor to the condition that the back oxygen sensor was reformed 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 three-way catalyst's removal detection in three-way catalyst deoxidization in-process, if there is inflection point detection value in the change trend that the back oxygen sensor detection value corresponds, can characterize back oxygen sensor and pass through the transformation, this abnormal condition of three-way catalyst removal to realize whether three-way catalyst is removed accurate judgement.
Drawings
FIG. 1 is a flowchart of a method for detecting removal of a three-way catalyst according to an embodiment of the present application;
FIG. 2 is a flow chart of an implementation of determining a vehicle speed threshold according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a removal detection device of a three-way catalyst according to an embodiment of the present application.
Detailed Description
As described above, the inventors found in the study on the three-way catalyst that: in order to detect whether the three-way catalyst is manually removed or not, precious metals are prevented from being stolen, it is generally possible to determine whether the three-way catalyst is removed or not by detecting the conversion efficiency of the three-way catalyst. When the conversion efficiency of the three-way catalyst is lowered, it is determined that the three-way catalyst is removed. However, in the case where the three-way catalyst is removed, if the post-oxygen sensor is modified, that is, a cavity is added to the post-oxygen sensor, the conversion efficiency of the three-way catalyst detected thereafter may be similar to that when the three-way catalyst is mounted, resulting in an inability to effectively and accurately determine whether the three-way catalyst is removed.
In order to solve the above problems, an embodiment of the present application provides a removal detection method of a three-way catalyst. The method may include: the engine is controlled to resume supplying fuel so as to deoxidize the three-way catalyst, and then in the deoxidizing process of 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. In this way, when the change trend 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 three-way catalyst treatment can be monitored to the back oxygen sensor to the condition that the back oxygen sensor was reformed can lead to the change of back oxygen sensor detected value to take place to delay, consequently, can combine back oxygen sensor detected value to carry out three-way catalyst's removal detection, if there is inflection point detected value in the change trend that the back oxygen sensor detected value corresponds, can characterize that the back oxygen sensor passes through reforming transform, and this abnormal condition of three-way catalyst removal to realize whether three-way catalyst is removed accurate judgement.
In order to make the present application better understood by those skilled in the art, the following description will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Fig. 1 is a flowchart of a method for detecting removal of a three-way catalyst according to an embodiment of the present application.
Referring to fig. 1, the method for detecting removal of a three-way catalyst according to the embodiment of the present application may include:
S101: the engine is controlled to resume supplying fuel to deoxygenate the three-way catalyst.
In the embodiment of the application, before the engine is controlled to resume supplying fuel, the engine can be controlled to enter a reverse-dragging working condition so as to store oxygen for the three-way catalyst until the detection value of the front oxygen sensor is equal to the detection value of the preset front oxygen sensor. The reverse towing working condition refers to a working condition that the vehicle engine does not have power requirements when running to downhill, coasting and other road conditions. When the engine enters the reverse towing working condition, the engine does not spray oil and the engine cylinder does not burn, so air can enter the exhaust pipe, the catalyst in the three-way catalyst adsorbs oxygen, and oxygen storage is completed. In general, when 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 lambda value (excess air ratio) may be equal to the preset front oxygen sensor lambda value 16.
When the engine is controlled to resume supplying 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 deoxygenation process, so that the removal detection of the three-way catalyst is finished in the deoxygenation process of the three-way catalyst, and whether the three-way catalyst is removed can be accurately and effectively judged on the premise that the normal operation of the engine is not influenced.
S102: in the deoxidizing process of 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 post-oxygen sensor detection value may be embodied as a post-oxygen voltage. The conditions for selecting the collection time of the detection value of the post-oxygen sensor are not particularly limited. For example, from the time when the detected value of the front oxygen sensor starts to decrease, the detected values of the rear oxygen sensor at 5 different times may be collected at will 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, the embodiment of the present application may not be particularly limited as to the determination process of the trend of the change in the detection value of the post-oxygen sensor. For ease of understanding, embodiments of the present application may be provided to illustrate a variety of possible implementations.
In one possible embodiment, the post-oxygen sensor detection values at a plurality of different times may be converted into the trend of the variation of the post-oxygen sensor detection values by means of a trend chart. The trend graph can be embodied as one or more of a line graph, a graph and a bar graph. In the line graph and the graph, the rising or falling of the line graph and the graph can represent the increase or decrease of the detection value of the post-oxygen sensor at a plurality of different moments; in the histogram, the length of the column represents the increase or decrease in the detected value of the post-oxygen sensor at a plurality of different times. Therefore, the change trend of the detection value of the rear oxygen sensor can be intuitively and clearly obtained, and the follow-up convenient determination of whether the three-way catalyst is removed is facilitated.
In another possible embodiment, the trend of the detected value of the post-oxygen sensor may be obtained by analyzing an average value of the detected values of the post-oxygen sensor at a plurality of different times. In this way, no trend graph is required to be drawn, which is helpful for reducing the complexity of removal detection of the three-way catalyst. For technical details, see 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 collection 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 a 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. Because the detected value of the rear oxygen sensor is larger than or equal to the preset detected value of the rear oxygen sensor, and the change trend of the detected value of the front oxygen sensor does not accord with the preset change trend, the change trend of the detected value of the rear oxygen sensor can be influenced, and therefore, the detected value of the rear oxygen sensor can be stopped from being acquired when the two conditions occur. Further, if the two conditions occur, the collected detection values of the post-oxygen sensor at a plurality of different moments may be cleared after the change trend of the detection values of the post-oxygen sensor is determined.
S103: when the change trend 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 installed, the engine resumes the supply of fuel, and the change in the detection value of the post-oxygen sensor tends to rise smoothly in the process of deoxidizing the three-way catalyst. And for the situation that the three-way catalyst is removed and the cavity is added on the post-oxygen sensor, the engine resumes to supply fuel, so that in the process of deoxidizing the three-way catalyst, the change of the detection value of the post-oxygen sensor can be delayed and instantly rises after the delay, and the fluctuation rising trend is presented. Therefore, if the inflection point detection values exist in the detection values of the rear oxygen sensor at a plurality of different moments, the abnormal condition that the three-way catalyst is removed after the rear oxygen sensor is transformed can be represented, and therefore whether the three-way catalyst is removed or not can be accurately judged.
In combination with the above related content of S101 to S103, in the embodiment of the present application, the engine may be controlled to resume supplying fuel first to deoxidize the three-way catalyst, and then in the deoxidizing process of 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 sensors at a plurality of different moments. In this way, when the change trend 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 three-way catalyst treatment can be monitored to the back oxygen sensor to the condition that the back oxygen sensor was reformed 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 three-way catalyst's removal detection in three-way catalyst deoxidization in-process, if there is inflection point detection value in the change trend that the back oxygen sensor detection value corresponds, can characterize back oxygen sensor and pass through the transformation, this abnormal condition of three-way catalyst removal to realize whether three-way catalyst is removed accurate judgement.
In order to conveniently determine whether the three-way catalyst is removed and reduce the complexity of the removal detection of the three-way catalyst, embodiments of the present application may provide a possible implementation of determining the trend of change in the detection value of the post-oxygen sensor, which may specifically include S201-S202. S201 and S202 are described below with reference to the embodiments and drawings, respectively.
Fig. 2 is a flowchart of an implementation manner of determining a vehicle speed threshold according to an embodiment of the present application. Referring to fig. 2, S201 to S202 may specifically include:
s201: and determining an 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.
S202: and determining the change trend according to the average value and a preset reference average value when the three-way catalyst is not removed.
The embodiment of the present application may not be limited to a specific manner for determining the trend of variation, and for convenience of understanding, the following description will be made with reference to one possible embodiment.
In one possible implementation, S202 may specifically include: when the average value is matched with a preset reference average value, determining the change trend as a stable rising trend; and when the average value is not matched with the preset reference average value, determining the change trend as a fluctuation rising trend. Wherein the steady ascending trend is used for indicating that inflection point detection values do not exist in the detection values of the rear oxygen sensor at a plurality of different moments; the rising trend of the fluctuation is used for indicating the existence of an inflection point detection value in the post-oxygen sensor detection values at a plurality of different moments. In addition, the average value is matched with the preset reference average value, which can be represented by the fact that the average value is equal to the preset reference average value or a negligible error exists between the average value and the preset reference average value; the average value is not matched with the preset reference average value, and the difference between the preset average values of the average values is larger. Since the preset reference average value when the three-way catalyst is not removed is preset, when the actual average value is matched with the preset reference average value, it can be considered that the inflection point detection value does not exist in the post-oxygen sensor detection values at a plurality of different moments, that is, the detection trend of the post-oxygen sensor detection value is a stable rising trend. And when the average value is not matched with the preset reference average value, the inflection point detection values exist in the detection values of the rear oxygen sensors at different moments, namely the detection trend of the detection values of the rear oxygen sensors is a fluctuation rising trend.
In combination with the above related content of S201-S202, 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 detection values of the post-oxygen sensors at a plurality of different moments and the preset reference average value when the three-way catalyst is not removed, and trend drawing is not required, so that the complexity of removal detection of the three-way catalyst is reduced.
Based on the method for detecting removal of the three-way catalyst provided by the embodiment, the embodiment of the application also provides a device for detecting removal 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 of a three-way catalyst according to an embodiment of the present application. Referring to fig. 3, a removal detection device 300 for a three-way catalyst according to an embodiment of the present application may include:
The deoxygenation control module 301 is used for controlling the engine to resume supplying fuel so as to deoxygenate the three-way catalyst;
The change trend determining module 302 is configured to determine a 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 deoxygenation process of the three-way catalyst;
the removal detection module 303 is configured to determine that the three-way catalyst is removed when the change trend indicates that there are inflection point detection values 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 change trend determination module 302 and the removal detection module 303, the removal detection of the three-way catalyst can be performed by combining the detection value of the rear oxygen sensor in the deoxygenation process of the three-way catalyst, if the inflection point detection value exists in the change trend corresponding to the detection value of the rear oxygen sensor, the situation that the rear oxygen sensor is transformed and the three-way catalyst is removed can be represented, so that the accurate judgment of whether the three-way catalyst is removed or not is realized.
As one embodiment, in order to accurately and effectively determine whether the three-way catalyst is removed, the change trend determining module 302 specifically includes:
The first determining module is used for determining an average value of the detection values of the rear oxygen sensors at different moments according to the detection values of the rear oxygen sensors at 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, to accurately and effectively determine whether the three-way catalyst is removed, the second determining module is specifically configured to:
When the average value is matched with a preset reference average value, determining the change trend as a stable rising trend; the steady ascending trend is used for indicating that inflection point detection values do not exist in the detection values of the rear oxygen sensor at a plurality of different moments;
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 for indicating the existence of an inflection point detection value in the post-oxygen sensor detection values at a plurality of different moments.
As an embodiment, in order to accurately and effectively determine whether the three-way catalyst is removed, the removal detection device 300 of the three-way catalyst may further include:
And the oxygen storage control module is used for controlling the engine to enter a reverse-dragging working condition so as to store oxygen for the three-way catalyst until the detection value of the front oxygen sensor is equal to the detection value of the preset front oxygen sensor.
As an embodiment, in order to accurately and effectively determine whether the three-way catalyst is removed, the removal detection device 300 of the three-way catalyst 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 larger 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 for illustrating the technical solution of the present application, and are not limiting; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application.
Claims (8)
1. A method of detecting removal of a three-way catalyst, comprising:
Controlling the engine to resume supplying fuel to deoxidize the three-way catalyst;
In the deoxidation process of 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 change trend indicates that an inflection point detection value exists in the post-oxygen sensor detection values at the plurality of different moments;
wherein, according to the back oxygen sensor detection value of a plurality of different moments, confirm the change trend of back oxygen sensor detection value includes:
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.
2. The method of claim 1, wherein the determining the trend of change based on 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 stable rising trend; the stationary upward trend is used for indicating that the inflection point detection value does not exist in the post-oxygen sensor detection values at the plurality of different moments;
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 for indicating that the inflection point detection value exists in the post-oxygen sensor detection values at the plurality of different moments.
3. The method of claim 1 or 2, wherein the method further comprises, prior to the controlling the engine to resume supplying fuel:
And controlling the engine to enter a reverse-dragging working condition so as to store oxygen for the three-way catalyst until the detection value of the front oxygen sensor is equal to the detection value of the preset front oxygen sensor.
4. The method according to claim 1 or 2, characterized in that the method further comprises:
And stopping collecting the detection value of the rear oxygen sensor when the detection value of the rear oxygen sensor is larger 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.
5. A removal detection device of a three-way catalyst, characterized by comprising:
the deoxygenation control module is used for controlling the engine to resume supplying 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 deoxidation process of the three-way catalyst;
The removal detection module is used for determining that the three-way catalyst is removed when the change trend indicates that inflection point detection values exist in the detection values of the rear oxygen sensors at the plurality of different moments;
The change trend determining module specifically comprises:
the first determining module is used for 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 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.
6. The apparatus of claim 5, 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 stable rising trend; the stationary upward trend is used for indicating that the inflection point detection value does not exist in the post-oxygen sensor detection values at the plurality of different moments;
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 for indicating that the inflection point detection value exists in the post-oxygen sensor detection values at the plurality of different moments.
7. The apparatus according to claim 5 or 6, characterized in that the apparatus further comprises:
and the oxygen storage control module is used for controlling the engine to enter a reverse-dragging working condition so as to store oxygen for the three-way catalyst until the detection value of the front oxygen sensor is equal to the detection value of the preset front oxygen sensor.
8. The apparatus according to claim 5 or 6, characterized in that 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 larger 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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