CN113586214B - Three-way catalyst monitoring method, vehicle exhaust system and vehicle - Google Patents
Three-way catalyst monitoring method, vehicle exhaust system and vehicle Download PDFInfo
- Publication number
- CN113586214B CN113586214B CN202111067121.4A CN202111067121A CN113586214B CN 113586214 B CN113586214 B CN 113586214B CN 202111067121 A CN202111067121 A CN 202111067121A CN 113586214 B CN113586214 B CN 113586214B
- Authority
- CN
- China
- Prior art keywords
- voltage
- preset
- way catalyst
- change rate
- oxygen sensor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
- 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
-
- 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
Abstract
The invention relates to the technical field of engines, and discloses a three-way catalyst monitoring method, a vehicle exhaust system and a vehicle. According to the three-way catalyst monitoring method, after the engine recovers fuel supply, the delay time of the voltage of the rear oxygen sensor rising to the first preset voltage and the voltage change rate of the voltage of the rear oxygen sensor increasing from the first preset voltage to the second preset voltage are obtained, whether the three-way catalyst is removed or not is confirmed based on the delay time and/or the voltage change rate, whether the three-way catalyst is removed or not and whether a cavity is installed in the rear oxygen sensor or not can be accurately and effectively judged, and therefore the probability of error judgment of the three-way catalyst is reduced.
Description
Technical Field
The invention relates to the technical field of engines, in particular to a three-way catalyst monitoring method, a vehicle exhaust system and a vehicle.
Background
The three-way catalyst is a device which is installed in an automobile exhaust emission system and is used for treating the emitted automobile exhaust so as to convert harmful gases such as nitrogen oxides, carbon monoxide and the like in the exhaust into water, carbon dioxide and nitrogen through oxidation-reduction reaction.
Because the price of the precious metal in the three-way catalyst is high, the three-way catalyst is often removed illegally without being known by a user, so that the tail gas emitted by an automobile is directly emitted into the atmosphere, and the environment is seriously polluted. In order to facilitate a user to know whether the three-way catalyst is illegally removed in time, in the prior art, active enrichment and dilution are usually performed on a mixed gas, a certain range of voltage of a later oxygen sensor is used as a condition for starting and stopping detection, and oxygen storage amount of the three-way catalyst is calculated.
However, if the three-way catalyst is cancelled and a cavity is added on the rear oxygen sensor, and the detection result is close to that of the three-way catalyst installed by adopting the method for detection, so that whether the three-way catalyst is removed cannot be effectively judged.
Disclosure of Invention
The invention aims to provide a three-way catalyst monitoring method, a vehicle exhaust system and a vehicle, which can accurately judge whether the three-way catalyst is removed and whether a cavity is arranged on a rear oxygen sensor.
In order to achieve the purpose, the invention adopts the following technical scheme:
a three-way catalyst monitoring method comprises the following steps:
after the engine recovers fuel supply, acquiring delay time of the voltage of the rear oxygen sensor rising to a first preset voltage and voltage change rate of the voltage of the rear oxygen sensor increasing from the first preset voltage to a second preset voltage;
confirming whether the three-way catalyst is removed based on the delay time and/or the voltage change rate.
As a preferable technical solution of the three-way catalyst monitoring method, after the fuel supply of the engine is resumed, if the delay time is longer than a preset time period and/or the voltage change rate is longer than a preset voltage change rate, the three-way catalyst is removed.
As a preferred technical solution of the three-way catalyst monitoring method, after the engine resumes fuel supply each time, recording a delay time for the voltage of the rear oxygen sensor to rise to a first preset voltage, and a voltage change rate for the voltage of the rear oxygen sensor to increase from the first preset voltage to a second preset voltage;
obtaining an average value of delay time of at least two continuous times and a corresponding average value of voltage change rate;
if the average value of the delay time is greater than the preset time length and/or the average value of the voltage change rate is greater than the preset voltage change rate, the three-way catalyst is removed.
As a preferred technical solution of the three-way catalyst monitoring method, after the engine resumes fuel supply each time, comparing the delay time for the voltage of the rear oxygen sensor to rise to the first preset voltage with the preset duration, and the voltage change rate for the voltage of the rear oxygen sensor to increase from the first preset voltage to the second preset voltage with the preset voltage change rate;
if the delay time is greater than the preset duration and/or the voltage change rate is greater than the preset voltage change rate continuously for at least two times, the three-way catalyst is removed.
As a preferred technical solution of the three-way catalyst monitoring method, after the engine resumes fuel supply each time, comparing the delay time of the voltage of the post-oxygen sensor rising to the first preset voltage with the preset duration, and the voltage change rate of the post-oxygen sensor increasing from the first preset voltage to the second preset voltage with the preset voltage change rate;
the number of times of engine fuel supply recovery is N, N is larger than or equal to 3, the comparison result is that the delay time is larger than the preset duration and/or the number of times of the voltage change rate is larger than the preset voltage change rate is M, and if M/N is larger than or equal to the preset ratio, the three-way catalyst is removed.
As a preferable aspect of the three-way catalyst monitoring method described above, the voltage change rate at which the voltage of the rear oxygen sensor is increased from the first preset voltage to the second preset voltage means a voltage average slope at which the voltage of the rear oxygen sensor is increased from the first preset voltage to the second preset voltage after the fuel supply is resumed for one engine.
As a preferred technical scheme of the three-way catalyst monitoring method, after the engine recovers air supply, whether the air inlet temperature of the three-way catalyst is higher than the ignition temperature of the three-way catalyst is judged;
and when the air inlet temperature of the three-way catalyst is higher than the light-off temperature of the three-way catalyst, starting timing until the voltage of the rear oxygen sensor rises to a first preset voltage, and stopping timing, wherein the time length from the timing starting time to the timing stopping time is delay time.
As a preferred technical scheme of the three-way catalyst monitoring method, after the air supply of the engine is recovered, whether the engine load is greater than or equal to a preset load is judged;
when the load of the engine is larger than or equal to the preset load, starting timing until the voltage of the rear oxygen sensor rises to the first preset voltage, and stopping timing, wherein the time length from the timing starting time to the timing stopping time is delay time.
The invention also provides a vehicle exhaust system which adopts the three-way catalyst monitoring method.
The invention also provides a vehicle comprising the vehicle exhaust system.
The invention has the beneficial effects that: according to the three-way catalyst monitoring method, the vehicle exhaust system and the vehicle, after the engine recovers fuel supply, the delay time of the voltage of the rear oxygen sensor rising to the first preset voltage and the voltage change rate of the voltage of the rear oxygen sensor increasing from the first preset voltage to the second preset voltage are obtained, whether the three-way catalyst is removed or not is confirmed based on the delay time and/or the voltage change rate, whether the three-way catalyst is removed or not and whether the rear oxygen sensor is provided with the cavity or not can be accurately and effectively judged, and therefore the probability of error judgment of the three-way catalyst fault is reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.
FIG. 1 is a flow chart of a three-way catalyst monitoring method provided by an embodiment of the invention;
FIG. 2 is a flowchart of a three-way catalyst monitoring method provided in accordance with a second embodiment of the present invention;
FIG. 3 is a flowchart of a three-way catalyst monitoring method according to a third embodiment of the invention.
Detailed Description
In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements associated with the present invention are shown in the drawings.
Example one
The embodiment provides a three-way catalyst monitoring method and a vehicle exhaust system, wherein the vehicle exhaust system comprises an exhaust pipe and a three-way catalyst, the exhaust pipe is communicated with an exhaust port of an engine, and the three-way catalyst is used for purifying high-temperature tail gas in the exhaust pipe so as to convert harmful gases such as carbon monoxide (CO), Hydrocarbon (HC) and nitrogen oxide (NOx) in the high-temperature tail gas into harmless carbon dioxide, water, nitrogen and the like through oxidation-reduction reaction.
A temperature sensor is installed at the air inlet of the three-way catalyst, and a rear oxygen sensor is installed at the air outlet of the three-way catalyst.
In a vehicle equipped with a three-way catalyst, after the engine resumes fueling, the rear oxygen sensor is delayed by about 1.5 seconds at about 0V, and then the voltage of the rear oxygen sensor slowly rises. For a vehicle with a three-way catalyst removed and a cavity added to the rear oxygen sensor, after the engine resumes fueling, the rear oxygen sensor will delay around 0V for around 8s, and then the voltage of the rear oxygen sensor will momentarily rise from 0V to 0.7V. Therefore, after the engine resumes fuel supply, the delay time of the rear oxygen sensor and the voltage change rate of the rear oxygen sensor can be detected, so as to accurately detect whether the three-way catalyst is removed and whether a cavity is added on the rear oxygen sensor.
Based on the above situation, the three-way catalyst monitoring method provided by the embodiment determines whether the rear oxygen sensor is removed and the cavity is added by detecting the voltage change of the rear oxygen sensor after the engine resumes fuel supply.
Fig. 1 is a flowchart of a three-way catalyst monitoring method provided in this embodiment, and as shown in fig. 1, the three-way catalyst monitoring method provided in this embodiment includes the steps of:
after the engine recovers fuel supply, acquiring delay time of the voltage of the rear oxygen sensor rising to a first preset voltage and voltage change rate of the voltage of the rear oxygen sensor increasing from the first preset voltage to a second preset voltage; whether the three-way catalyst is removed is confirmed based on the delay time and/or the voltage change rate.
Specifically, after the fuel supply of the engine is resumed once, if the delay time is longer than a preset time period and the voltage change rate is longer than a preset voltage change rate, the three-way catalyst is removed; if the delay time is not satisfied to be greater than the preset duration and the voltage change rate is greater than the preset voltage change rate, the three-way catalyst is not removed. In other embodiments, only the delay time greater than the preset duration or only the voltage change rate greater than the preset voltage change rate may be used as the criterion for determining that the three-way catalyst is removed, but compared with this embodiment, the accuracy of the fault determination of the three-way catalyst is lower.
For a gas engine, such as a natural gas engine, engine restoration fueling refers to engine restoration of natural gas supply; with respect to a fuel-powered engine, engine restoration of fueling refers to engine restoration of fueling.
The preset time period is a time period for the voltage of the rear oxygen sensor to reach the first preset voltage after the engine resumes fuel supply to the vehicle in which the three-way catalyst is installed. And determining the preset time length through repeated tests, wherein the value range of the preset time length is 7 s-9 s, and optionally, the preset time length can be 7s, 8s or 9 s. Preferably, the preset time period is 8 s.
The voltage change rate at which the voltage of the rear oxygen sensor is increased from the first preset voltage to the second preset voltage means a voltage average slope at which the voltage of the rear oxygen sensor is increased from the first preset voltage to the second preset voltage after the fuel supply is resumed from the engine once. The meaning expressed by the preset voltage change rate is the same as the meaning of the voltage average slope, and the preset voltage change rate can be determined through repeated tests. The first preset voltage is 0V-0.2V and does not include 0V. Alternatively, the first preset voltage may be 0.05V, 0.1V, 0.15V, or 0.2V. Preferably, the first preset voltage is 0.1V. The second preset voltage is 0.6V to 0.8V, and optionally, the second preset voltage may be 0.6V, 0.7V, or 0.8V. Preferably, the second preset voltage is 0.7V.
It should be noted that, in the three-way catalyst monitoring method provided in this embodiment, if the three-way catalyst is removed as a monitoring result, a cavity is simultaneously disposed on the rear oxygen sensor. For a vehicle with a three-way catalyst removed but no cavity added to the rear oxygen sensor, the above method is not applicable.
Further, in order to ensure that the rear oxygen sensor works normally, when the engine is in a working condition of cutting off fuel supply, the voltage of the rear oxygen sensor is obtained, and if the voltage of the rear oxygen sensor is zero, the rear oxygen sensor is normal.
Further, when the inlet temperature of the three-way catalyst does not reach the light-off temperature of the three-way catalyst, although air flows through the three-way catalyst, because the three-way catalyst does not work, the voltage change of the rear oxygen sensor is closer to the voltage change after the three-way catalyst is removed, so that whether the three-way catalyst is removed or not is difficult to accurately judge. Further, when the engine load is small, the air amount may be insufficient, so that it is difficult to find a timing at which the voltage of the rear oxygen sensor reaches the second preset voltage.
For this reason, in the present embodiment, when the intake air temperature of the three-way catalyst is greater than the light-off temperature of the three-way catalyst and the engine load is greater than the preset load, the timing is started until the timing is stopped when the voltage of the rear oxygen sensor rises to the first preset voltage, and the time period between the timing that is started and the timing that is stopped is the delay time.
Illustratively, the three-way catalyst monitoring method provided by the embodiment includes the steps of:
s11, after the fuel supply of the engine is recovered, when the inlet temperature of the three-way catalyst reaches the ignition temperature of the three-way catalyst and the load of the engine is greater than or equal to a preset load, obtaining the delay time of the voltage of the rear oxygen sensor rising to the first preset voltage and the voltage change rate of the voltage of the rear oxygen sensor increasing from the first preset voltage to the second preset voltage.
S12, judging whether the delay time is longer than the preset duration and the voltage change rate is larger than the preset voltage change rate or not, if so, removing the three-way catalyst; if not, the three-way catalyst is not removed.
According to the vehicle exhaust system provided by the embodiment, by adopting the three-way catalyst monitoring method, whether the three-way catalyst is removed or not and whether the cavity is arranged on the rear oxygen sensor or not can be accurately and effectively judged according to the voltage change of the rear oxygen sensor, so that the fault misjudgment probability of the three-way catalyst is reduced.
The embodiment also provides a vehicle which comprises the vehicle exhaust system, and the vehicle exhaust system can passively execute the three-way catalyst monitoring method and cannot affect the normal operation of the whole vehicle.
And an alarm device is arranged in the vehicle, and after the three-way catalytic converter is confirmed to be removed, the alarm device gives an alarm to remind a driver. The alarm device may be an acoustic and/or optical alarm, and may also be displayed through a display screen in the vehicle, which is not limited in this respect.
Example two
The present embodiment is different from the first embodiment in that, in order to improve the accuracy of the three-way catalyst malfunction determination, the present embodiment proposes to confirm whether the three-way catalyst is removed based on the average value of the delay time after the engine resumes the fuel supply N times in succession and the average value of the voltage change rate. N is equal to or greater than 2, illustratively, N ═ 3.
Fig. 2 is a flowchart of a three-way catalyst monitoring method provided in this embodiment, and as shown in fig. 2, the three-way catalyst monitoring method provided in this embodiment includes the following steps:
s21, after the primary engine recovers fuel supply, when the inlet temperature of the three-way catalyst reaches the ignition temperature of the three-way catalyst and the engine load is greater than or equal to a preset load, acquiring the delay time of the voltage of the rear oxygen sensor rising to a first preset voltage and the voltage change rate of the voltage of the rear oxygen sensor increasing from the first preset voltage to a second preset voltage;
s22, judging whether the number of times of engine fuel supply recovery reaches N times, if so, executing S23, if not, adding 1 to the number of times of engine fuel supply recovery, and returning to S21;
s23, obtaining the average value of the delay time of N times and the average value of the voltage change rate of N times;
s24, judging whether the average value of the delay time is larger than the preset duration and the average value of the voltage change rate is larger than the preset voltage change rate, if so, removing the three-way catalyst; if not, the three-way catalyst is not removed.
EXAMPLE III
The present embodiment is different from the first embodiment in that, in order to improve the accuracy of the three-way catalyst malfunction determination, the present embodiment proposes to confirm whether the three-way catalyst is removed based on the delay time and the voltage change rate after the engine resumes fuel supply N consecutive times. N is not less than 3.
Fig. 3 is a flowchart of a three-way catalyst monitoring method provided in this embodiment, and as shown in fig. 3, the three-way catalyst monitoring method provided in this embodiment includes the following steps:
s31, after the engine recovers fuel supply, when the inlet temperature of the three-way catalyst reaches the ignition temperature of the three-way catalyst and the engine load is greater than or equal to a preset load, acquiring the delay time of the voltage of the rear oxygen sensor rising to a first preset voltage and the voltage change rate of the voltage of the rear oxygen sensor increasing from the first preset voltage to a second preset voltage;
s32, judging whether the delay time is longer than the preset time and the voltage change rate is larger than the preset voltage change rate, if so, adding 1 to the number M of times that the delay time is longer than the preset time and the voltage change rate is larger than the preset voltage change rate, and executing S33; if not, adding 1 to the number n of times of engine fuel supply resuming, and returning to S31;
s33, judging whether the number N of times of engine fuel supply recovery is equal to N, if so, executing S34, if not, adding 1 to the number N of times of engine fuel supply recovery, and returning to S31;
s34, judging whether the M/N is larger than or equal to a preset ratio, and if so, removing the three-way catalyst; if not, the three-way catalyst is not removed.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Claims (7)
1. A three-way catalyst monitoring method, comprising the steps of:
after the engine recovers fuel supply, acquiring delay time of the voltage of the rear oxygen sensor rising to a first preset voltage and voltage change rate of the voltage of the rear oxygen sensor increasing from the first preset voltage to a second preset voltage;
confirming whether the three-way catalyst is removed based on the delay time and the voltage change rate;
after the engine recovers fuel supply, when the inlet temperature of the three-way catalyst reaches the ignition temperature of the three-way catalyst and the engine load is greater than or equal to a preset load, acquiring the delay time of the voltage of the rear oxygen sensor rising to a first preset voltage and the voltage change rate of the voltage of the rear oxygen sensor increasing from the first preset voltage to a second preset voltage;
judging whether the delay time is longer than the preset time and the voltage change rate is larger than the preset voltage change rate or not, if so, removing the three-way catalyst; if not, the three-way catalyst is not removed;
after the engine resumes fuel supply, when the intake air temperature of the three-way catalyst is greater than the light-off temperature of the three-way catalyst and the engine load is greater than a preset load, starting timing until the voltage of the rear oxygen sensor rises to a first preset voltage, and stopping timing, wherein the time length from the timing starting time to the timing stopping time is delay time.
2. The three-way catalyst monitoring method according to claim 1, characterized in that after each resumption of fuel supply to the engine, a delay time for the voltage of the rear oxygen sensor to rise to a first preset voltage and a voltage change rate for the voltage of the rear oxygen sensor to increase from the first preset voltage to a second preset voltage are recorded;
obtaining an average value of delay time of at least two continuous times and a corresponding average value of voltage change rate;
if the average value of the delay time is greater than the preset time length and the average value of the voltage change rate is greater than the preset voltage change rate, the three-way catalyst is removed.
3. The three-way catalyst monitoring method according to claim 1, wherein after each resumption of fuel supply to the engine, the magnitude of the delay time for the voltage of the post-oxygen sensor to rise to the first preset voltage and the magnitude of the preset time period are compared, and the magnitude of the voltage change rate for the voltage of the post-oxygen sensor to increase from the first preset voltage to the second preset voltage and the magnitude of the preset voltage change rate are compared;
and if the delay time is greater than the preset time length and the voltage change rate is greater than the preset voltage change rate continuously for at least two times, removing the three-way catalyst.
4. The three-way catalyst monitoring method according to claim 1, wherein after each resumption of fuel supply to the engine, the magnitude of the delay time for the voltage of the post-oxygen sensor to rise to the first preset voltage and the magnitude of the preset time period are compared, and the magnitude of the voltage change rate for the voltage of the post-oxygen sensor to increase from the first preset voltage to the second preset voltage and the magnitude of the preset voltage change rate are compared;
the number of times of engine fuel supply recovery is N, N is larger than or equal to 3, the comparison result shows that the delay time is larger than the preset time length and the number of times of the voltage change rate larger than the preset voltage change rate is M, and if the M/N is larger than or equal to the preset ratio, the three-way catalyst is removed.
5. The three-way catalyst monitoring method according to any one of claims 1 to 4, wherein the rate of change in the voltage at which the voltage of the rear oxygen sensor is increased from the first preset voltage to the second preset voltage means a voltage average slope at which the voltage of the rear oxygen sensor is increased from the first preset voltage to the second preset voltage after the resumption of the fuel supply to the engine once.
6. A vehicle exhaust system characterized by employing the three-way catalyst monitoring method of any one of claims 1 to 5.
7. A vehicle comprising the vehicle exhaust system of claim 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111067121.4A CN113586214B (en) | 2021-09-13 | 2021-09-13 | Three-way catalyst monitoring method, vehicle exhaust system and vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111067121.4A CN113586214B (en) | 2021-09-13 | 2021-09-13 | Three-way catalyst monitoring method, vehicle exhaust system and vehicle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113586214A CN113586214A (en) | 2021-11-02 |
| CN113586214B true CN113586214B (en) | 2022-08-23 |
Family
ID=78241959
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111067121.4A Active CN113586214B (en) | 2021-09-13 | 2021-09-13 | Three-way catalyst monitoring method, vehicle exhaust system and vehicle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113586214B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114215632B (en) * | 2021-12-16 | 2022-11-29 | 潍柴动力股份有限公司 | Three-way catalytic converter cheating diagnosis method and related device |
| CN114233449B (en) * | 2021-12-22 | 2022-10-25 | 潍柴动力股份有限公司 | Post-processing diagnosis method and device, electronic equipment and computer storage medium |
| CN115126584B (en) * | 2022-07-20 | 2024-04-16 | 潍柴动力股份有限公司 | Method and device for removing and detecting three-way catalyst |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5279116A (en) * | 1991-12-16 | 1994-01-18 | Toyota Jidosha Kabushiki Kaisha | Device for determining deterioration of a catalytic converter for an engine |
| JP2006112285A (en) * | 2004-10-14 | 2006-04-27 | Aisan Ind Co Ltd | Exhaust emission control device for internal combustion engine |
| CN101042093A (en) * | 2006-03-24 | 2007-09-26 | 本田技研工业株式会社 | Catalyst deterioration detecting apparatus |
| CN101042092A (en) * | 2006-03-24 | 2007-09-26 | 本田技研工业株式会社 | Catalyst deterioration detecting apparatus |
| CN104594986A (en) * | 2014-11-28 | 2015-05-06 | 东风汽车公司 | Degradation diagnostic method for engine catalyst |
| CN105673169A (en) * | 2016-01-27 | 2016-06-15 | 潍柴动力股份有限公司 | Method and device used for monitoring three-way catalyst in engine exhaust system |
| CN108150264A (en) * | 2017-12-26 | 2018-06-12 | 潍柴动力股份有限公司 | A kind of method and device for detecting ternary catalyzing unit failure |
-
2021
- 2021-09-13 CN CN202111067121.4A patent/CN113586214B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5279116A (en) * | 1991-12-16 | 1994-01-18 | Toyota Jidosha Kabushiki Kaisha | Device for determining deterioration of a catalytic converter for an engine |
| JP2006112285A (en) * | 2004-10-14 | 2006-04-27 | Aisan Ind Co Ltd | Exhaust emission control device for internal combustion engine |
| CN101042093A (en) * | 2006-03-24 | 2007-09-26 | 本田技研工业株式会社 | Catalyst deterioration detecting apparatus |
| CN101042092A (en) * | 2006-03-24 | 2007-09-26 | 本田技研工业株式会社 | Catalyst deterioration detecting apparatus |
| CN104594986A (en) * | 2014-11-28 | 2015-05-06 | 东风汽车公司 | Degradation diagnostic method for engine catalyst |
| CN105673169A (en) * | 2016-01-27 | 2016-06-15 | 潍柴动力股份有限公司 | Method and device used for monitoring three-way catalyst in engine exhaust system |
| CN108150264A (en) * | 2017-12-26 | 2018-06-12 | 潍柴动力股份有限公司 | A kind of method and device for detecting ternary catalyzing unit failure |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113586214A (en) | 2021-11-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113586214B (en) | Three-way catalyst monitoring method, vehicle exhaust system and vehicle | |
| US20120023911A1 (en) | Detection of exhaust particulate filter substrate failure | |
| CN101240751B (en) | Post catalyst oxygen sensor diagnosis | |
| CN113431668B (en) | Three-way catalyst monitoring method in engine exhaust system and vehicle | |
| CN113431669B (en) | Three-way catalyst monitoring method in engine exhaust system and vehicle | |
| EP3051085B1 (en) | Diagnostic device for exhaust-gas purification device | |
| US20140144220A1 (en) | Diagnostic operation strategy for diesel oxidation catalyst aging level determination using nox sensor no2 interference | |
| US20100037592A1 (en) | Method and device for diagnosing an exhaust gas catalytic converter | |
| US20040200208A1 (en) | Method and apparatus for monitoring catalyst efficiency and outlet oxygen sensor performance | |
| US7478553B2 (en) | Method for detecting excessive burn | |
| CN111140327B (en) | Method and device for detecting conversion efficiency of three-way catalyst | |
| CN114087056A (en) | Diesel oil sulfur content prediction method and device and engine | |
| JP2009138604A (en) | Catalyst deterioration diagnosis device for internal combustion engine | |
| CN108035789B (en) | Gasoline vehicle multi-stage three-way catalyst performance online monitoring system and method | |
| JP6520977B2 (en) | Abnormality diagnosis device for exhaust purification system | |
| KR101294051B1 (en) | System for desulfurization of oxidation catalyst and method thereof | |
| JP2012036835A (en) | Exhaust emission control device | |
| CN114458512B (en) | Control method and system based on fire diagnosis of gas engine and vehicle | |
| JPH09144531A (en) | Device and method for supervising exhaust emission control system | |
| CN111219235A (en) | Vehicle exhaust gas treatment method, device, storage medium and vehicle | |
| CN112267929B (en) | Method for saving precious metal consumption of three-way catalyst, tail gas treatment system and vehicle | |
| US11085848B2 (en) | Method of estimating oxygen storage capacity of catalyst | |
| CN114687842B (en) | Three-way catalyst failure diagnosis method | |
| CN115288832B (en) | Diagnostic method and diagnostic system for identifying DOC sulfur poisoning and aging | |
| KR100570049B1 (en) | Control method to remove particulate matter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |