CN114776422B - Three-way catalyst aging diagnosis method and device and computer readable storage medium thereof - Google Patents
Three-way catalyst aging diagnosis method and device and computer readable storage medium thereof Download PDFInfo
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- CN114776422B CN114776422B CN202210505445.XA CN202210505445A CN114776422B CN 114776422 B CN114776422 B CN 114776422B CN 202210505445 A CN202210505445 A CN 202210505445A CN 114776422 B CN114776422 B CN 114776422B
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- 239000003054 catalyst Substances 0.000 title claims abstract description 163
- 230000032683 aging Effects 0.000 title claims abstract description 75
- 238000000034 method Methods 0.000 title claims abstract description 45
- 238000003745 diagnosis Methods 0.000 title claims abstract description 26
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 188
- 239000001301 oxygen Substances 0.000 claims abstract description 188
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 188
- 238000012544 monitoring process Methods 0.000 claims abstract description 54
- 238000001514 detection method Methods 0.000 claims abstract description 31
- 230000015556 catabolic process Effects 0.000 claims description 14
- 238000006731 degradation reaction Methods 0.000 claims description 14
- 239000007789 gas Substances 0.000 claims description 14
- 238000005516 engineering process Methods 0.000 abstract description 6
- 230000008569 process Effects 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000002405 diagnostic procedure Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 230000001960 triggered effect Effects 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
- F01N2550/00—Monitoring or diagnosing the deterioration of exhaust systems
- F01N2550/02—Catalytic activity of catalytic converters
-
- 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
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/04—Methods of control or diagnosing
- F01N2900/0422—Methods of control or diagnosing measuring the elapsed time
-
- 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
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
- F01N2900/1624—Catalyst oxygen storage capacity
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The invention discloses a three-way catalyst aging diagnosis method and device and a computer readable storage medium. Wherein the method comprises the following steps: when the engine is determined to be in a reverse driving working condition, monitoring the actual oxygen storage amount in the target three-way catalyst to obtain a monitoring result; when the monitoring result shows that the actual oxygen storage amount reaches the oxygen content limit value, acquiring the actual time used when the actual oxygen storage amount reaches the oxygen content limit value; acquiring theoretical duration used when the theoretical oxygen storage amount of the target three-way catalyst reaches the oxygen content limit value; determining an aging coefficient of the target three-way catalyst based on the actual time length and the theoretical time length; the degree of aging of the three-way catalyst is determined based on the aging coefficient. The method solves the technical problem that the detection result is not accurate enough because the method for detecting the aging state of the three-way catalyst in the related technology can not detect frequently.
Description
Technical Field
The invention relates to the field of electronic devices, in particular to a three-way catalyst aging diagnosis method and device and a computer readable storage medium.
Background
Currently, a three-way catalyst is generally adopted for treating the generated tail gas of a natural gas engine, and the three-way catalyst can convert CO, HC and NOx into CO2, H2O and N2 through catalytic oxidation and reduction reactions; however, during long-term operation of natural gas engines, the three-way catalyst may undergo hydrothermal aging due to the long-term exposure of the three-way catalyst to high Wen Fushui vapor; therefore, the aging condition of the three-way catalyst needs to be judged, and the mode of actively filling and discharging oxygen to penetrate the three-way catalyst is generally adopted at present, so that the maximum oxygen storage amount of the three-way catalyst is measured, and the aging state of the current catalyst is judged; however, the active judgment method causes emission loss, so that the detection cannot be frequently performed, and the detection accuracy is reduced.
In view of the above problems, no effective solution has been proposed at present.
Disclosure of Invention
The embodiment of the invention provides a three-way catalyst aging diagnosis method, a device thereof and a computer readable storage medium, which at least solve the technical problem that the detection result accuracy is insufficient due to the fact that the method for detecting the aging state of the three-way catalyst in the related technology cannot be frequently detected.
According to an aspect of an embodiment of the present invention, there is provided a three-way catalyst aging diagnosis method including: when the engine is determined to be in a reverse driving working condition, monitoring the actual oxygen storage amount in the target three-way catalyst to obtain a monitoring result; when the monitoring result shows that the actual oxygen storage amount reaches the oxygen content limit value, acquiring the actual time length used when the actual oxygen storage amount reaches the oxygen content limit value; acquiring theoretical duration used when the theoretical oxygen storage amount of the target three-way catalyst reaches the oxygen content limit value; determining an aging coefficient of the target three-way catalyst based on the actual time length and the theoretical time length; and determining the aging degree of the three-way catalyst based on the aging coefficient.
Optionally, when the engine is determined to be in a reverse driving condition, monitoring the actual oxygen storage amount in the target three-way catalyst to obtain a monitoring result, including: when the engine is detected to be in an idle state, determining that the engine enters the reverse towing working condition, and generating a monitoring signal; and sending the monitoring signal to a switching oxygen sensor so as to trigger the switching oxygen sensor to monitor the actual oxygen storage amount of the three-way catalyst to obtain a monitoring result, wherein the switching oxygen sensor is arranged at a preset position at the downstream of the three-way catalyst.
Optionally, obtaining an actual duration of time used when the actual oxygen storage amount reaches the oxygen content limit value includes: when the engine is determined to be in the reverse driving working condition, detecting whether gas flows into the target three-way catalyst through the cylinder or not to obtain a detection result; and when the detection result shows that gas flows into the target three-way catalyst through the cylinder, triggering a timer to start timing until the monitoring result shows that the actual oxygen storage amount reaches the oxygen content limit value.
Optionally, obtaining an actual duration of time used when the actual oxygen storage amount reaches the oxygen content limit value includes: acquiring the real-time oxygen storage amount in the target three-way catalyst monitored by the switch oxygen sensor; converting the real-time oxygen storage amount into a real-time voltage value of the engine; determining a first moment when the real-time voltage value is lower than a voltage threshold value; and acquiring the actual duration used when the actual oxygen storage amount reaches the oxygen content limit value based on the second moment when the engine enters the reverse towing mode and the first moment.
Optionally, obtaining a theoretical duration used when the theoretical oxygen storage amount of the target three-way catalyst reaches the oxygen content limit value includes: acquiring a physical model of the target three-way catalyst, wherein the physical model is a model which is generated in advance based on structural information of the target three-way catalyst; determining an excess air ratio downstream of the target three-way catalyst based on the physical model; and acquiring the theoretical duration based on a third moment when the engine enters the reverse traction mode and a fourth moment when the excess air ratio is higher than a preset coefficient.
Optionally, before determining the aging coefficient of the target three-way catalyst based on the actual time period and the theoretical time period, the method further includes: and determining that the engine exits the reverse driving condition.
According to an aspect of the embodiment of the present invention, there is also provided a three-way catalyst aging diagnosis apparatus including: the detection module is used for monitoring the actual oxygen storage amount in the target three-way catalyst when the engine is determined to be in the reverse towing working condition, so as to obtain a monitoring result; the first acquisition module is used for acquiring the actual duration used when the actual oxygen storage amount reaches the oxygen content limit value when the monitoring result shows that the actual oxygen storage amount reaches the oxygen content limit value; the second acquisition module is used for acquiring theoretical duration used when the theoretical oxygen storage amount of the target three-way catalyst reaches the oxygen content limit value; the first determining module is used for determining the aging coefficient of the target three-way catalyst based on the actual time length and the theoretical time length; and the second determining module is used for determining the aging degree of the three-way catalyst based on the aging coefficient.
Optionally, the detection module includes: the first determining unit is used for determining that the engine enters the reverse driving working condition when the engine is detected to be in an idle state, and generating a monitoring signal; and the sending unit is used for sending the monitoring signal to the switch oxygen sensor so as to trigger the switch oxygen sensor to monitor the actual oxygen storage amount of the three-way catalyst to obtain a monitoring result, wherein the switch oxygen sensor is arranged at a preset position at the downstream of the three-way catalyst.
Optionally, the first acquisition module includes: the detection unit is used for detecting whether gas flows into the target three-way catalyst through the cylinder when the engine is determined to be in the reverse driving working condition, so as to obtain a detection result; and the triggering unit is used for triggering a timer to start timing when the detection result indicates that gas flows into the target three-way catalyst through the cylinder until the monitoring result indicates that the actual oxygen storage amount reaches the oxygen content limit value.
Optionally, the first acquisition module includes: the first acquisition unit is used for acquiring the real-time oxygen storage amount in the target three-way catalyst monitored by the switch oxygen sensor; the conversion unit is used for converting the real-time oxygen storage amount into a real-time voltage value of the engine; a second determining unit, configured to determine a first time when the real-time voltage value is lower than a voltage threshold; the second acquisition unit is used for acquiring the actual duration used when the actual oxygen storage amount reaches the oxygen content limit value based on the second moment when the engine enters the reverse towing mode and the first moment.
Optionally, the second acquisition module includes: a third obtaining unit, configured to obtain a physical model of the target three-way catalyst, where the physical model is a model that is generated in advance based on structural information of the target three-way catalyst; a third determination unit configured to determine an excess air ratio downstream of the target three-way catalyst based on the physical model; and a fourth acquisition unit configured to acquire the theoretical duration based on a third time at which the engine enters the reverse towing mode and a fourth time at which the excess air ratio is higher than a predetermined coefficient.
Optionally, the apparatus further comprises: and the fourth determining unit is used for determining that the engine exits the reverse driving condition before determining the aging coefficient of the target three-way catalyst based on the actual time length and the theoretical time length.
According to an aspect of the embodiment of the present invention, there is also provided a computer-readable storage medium including a stored program, wherein the program, when executed, controls a device in which the computer-readable storage medium is located to execute any one of the three-way catalyst degradation diagnosis methods.
According to an aspect of the embodiment of the present invention, there is also provided a processor for running a program, wherein the program runs to execute any one of the three-way catalyst degradation diagnosis methods.
In the embodiment of the invention, when the engine is determined to be in a reverse towing working condition, the actual oxygen storage amount in the target three-way catalyst is monitored to obtain a monitoring result; when the monitoring result shows that the actual oxygen storage amount reaches the oxygen content limit value, acquiring the actual time used when the actual oxygen storage amount reaches the oxygen content limit value; acquiring theoretical duration used when the theoretical oxygen storage amount of the target three-way catalyst reaches the oxygen content limit value; determining an aging coefficient of the target three-way catalyst based on the actual time length and the theoretical time length; the degree of aging of the three-way catalyst is determined based on the aging coefficient. According to the three-way catalyst aging diagnosis method provided by the embodiment of the invention, the purpose of determining the aging coefficient of the three-way catalyst based on the aging coefficient after the theoretical time length and the actual time length used when the theoretical oxygen storage amount of the three-way catalyst reaches the oxygen content limit value are achieved, and the aging degree of the three-way catalyst is determined based on the aging coefficient is achieved, so that the technical effect of improving the accuracy of detecting the aging degree of the three-way catalyst is achieved, and the technical problem that the detection result accuracy is insufficient due to the fact that the method for detecting the aging state of the three-way catalyst in the related technology cannot be frequently detected is solved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention. In the drawings:
FIG. 1 is a flow chart of a three-way catalyst degradation diagnostic method according to an embodiment of the present invention;
FIG. 2 is a flow chart of a TWC degradation diagnosis method according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a three-way catalyst degradation diagnosis apparatus according to an embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Example 1
In accordance with an embodiment of the present invention, a method embodiment of a TWC aging diagnostic method is provided, it being noted that the steps illustrated in the flowchart of the figures may be performed in a computer system, such as a set of computer executable instructions, and, although a logical sequence is illustrated in the flowchart, in some cases, the steps illustrated or described may be performed in a different order than that illustrated herein.
FIG. 1 is a flow chart of a three-way catalyst degradation diagnosis method according to an embodiment of the present invention, as shown in FIG. 1, the method including the steps of:
step S102, when the engine is determined to be in a reverse towing working condition, monitoring the actual oxygen storage amount in the target three-way catalyst to obtain a monitoring result;
optionally, when the transmitter is in a reverse towing condition, the actual oxygen storage amount in the three-way catalyst is detected to obtain a detection result.
Step S104, when the monitoring result shows that the actual oxygen storage amount reaches the oxygen content limit value, acquiring the actual time length used when the actual oxygen storage amount reaches the oxygen content limit value;
optionally, when the actual oxygen storage amount reaches the oxygen content threshold, an actual time period that is experienced when the actual oxygen storage amount reaches the oxygen content threshold is obtained.
Step S106, obtaining theoretical duration used when the theoretical oxygen storage amount of the target three-way catalyst reaches the oxygen content limit value;
alternatively, a theoretical duration is determined that is required for the theoretical oxygen storage capacity of the three-way catalyst to reach the oxygen content limit.
Step S108, determining an aging coefficient of the target three-way catalyst based on the actual time length and the theoretical time length;
optionally, the aging coefficient of the three-way catalyst is determined based on the relation between the two parameters of the actual time length and the theoretical time length.
Step S110, determining the aging degree of the three-way catalyst based on the aging coefficient.
It can be known from the above that, in the embodiment of the present invention, when it is determined that the engine is in the reverse-towing condition, the actual oxygen storage amount in the target three-way catalyst may be monitored to obtain a monitoring result; then, when the monitoring result shows that the actual oxygen storage amount reaches the oxygen content limit value, acquiring the actual time length used when the actual oxygen storage amount reaches the oxygen content limit value; then, the theoretical duration used when the theoretical oxygen storage amount of the target three-way catalyst reaches the oxygen content limit value can be obtained; then, the aging coefficient of the target three-way catalyst can be determined based on the actual time length and the theoretical time length; finally, the degree of aging of the three-way catalyst can be determined based on the aging coefficient. According to the three-way catalyst aging diagnosis method provided by the embodiment of the invention, the purpose of determining the aging coefficient of the three-way catalyst based on the aging coefficient after the theoretical time length and the actual time length used when the theoretical oxygen storage amount of the three-way catalyst reaches the oxygen content limit value are achieved, and the aging degree of the three-way catalyst is determined based on the aging coefficient is achieved, so that the technical effect of improving the accuracy of detecting the aging degree of the three-way catalyst is achieved, and the technical problem that the detection result accuracy is insufficient due to the fact that the method for detecting the aging state of the three-way catalyst in the related technology cannot be frequently detected is solved.
As an alternative embodiment, when the engine is determined to be in the reverse driving working condition, the actual oxygen storage amount in the target three-way catalyst is monitored to obtain a monitoring result, which comprises the following steps: when the engine is detected to be in an idle state, determining that the engine enters a reverse towing working condition, and generating a monitoring signal; and sending a monitoring signal to the switch oxygen sensor to trigger the switch oxygen sensor to monitor the actual oxygen storage amount of the three-way catalyst to obtain a monitoring result, wherein the switch oxygen sensor is arranged at a preset position at the downstream of the three-way catalyst.
In the above alternative embodiment, when the transmitter is detected to be in the idle state, it is determined that the transmitter enters the reverse driving condition, and a detection signal is generated and sent to the switching oxygen sensor, so that the switching oxygen sensor detects the actual oxygen storage amount of the three-way catalyst.
As an alternative embodiment, obtaining the actual time period used when the actual oxygen storage amount reaches the oxygen content limit value includes: when the engine is determined to be in a reverse towing working condition, detecting whether gas flows into a target three-way catalyst through a cylinder, and obtaining a detection result; and when the detection result shows that gas flows into the target three-way catalyst through the cylinder, triggering the timer to start timing until the monitoring result shows that the actual oxygen storage amount reaches the oxygen content limit value.
In the above alternative embodiment, it is first determined whether the engine is in a reverse towing condition, and when it is detected that gas flows into the three-way catalyst through the cylinder, a timer is triggered to start timing until the actual oxygen storage amount reaches the oxygen content limit.
As an alternative embodiment, obtaining the actual time period used when the actual oxygen storage amount reaches the oxygen content limit value includes: acquiring the real-time oxygen storage amount in the target three-way catalyst monitored by the switch oxygen sensor; converting the real-time oxygen storage amount into a real-time voltage value of the engine; determining a first moment when the real-time voltage value is lower than a voltage threshold value; and acquiring the actual duration used when the actual oxygen storage amount reaches the oxygen content limit value based on the second moment when the engine enters the reverse towing mode and the first moment.
In the above alternative embodiment, the real-time dynamic oxygen storage amount in the three-way catalyst detected by the switch oxygen sensor is firstly obtained, then the real-time dynamic oxygen storage amount is converted into the real-time voltage amount of the transmitter, and then when the real-time voltage amount is lower than the voltage threshold value, the actual time length required when the actual oxygen storage amount reaches the oxygen content limit value is determined based on the time and the time when the engine enters the reverse towing mode.
As an alternative embodiment, obtaining a theoretical duration of time for use when the theoretical oxygen storage amount of the target three-way catalyst reaches the oxygen content limit value includes: obtaining a physical model of a target three-way catalyst, wherein the physical model is a model which is generated in advance based on structural information of the target three-way catalyst; determining an excess air ratio of the downstream of the target three-way catalyst based on the physical model; the theoretical duration is acquired based on a third time at which the engine enters the reverse mode and a fourth time at which the excess air ratio is higher than a predetermined ratio.
In the above alternative embodiment, a physical model of the three-way catalyst that is generated in advance is first acquired, and then the excess air ratio (i.e., lambda) downstream of the three-way catalyst is determined based on the physical model.
As an alternative embodiment, before determining the aging coefficient of the target three-way catalyst based on the actual time period and the theoretical time period, the method further includes: and determining that the engine exits the reverse driving condition.
FIG. 2 is a flowchart of a TWC aging diagnosis method according to an embodiment of the present invention, as shown in FIG. 2, when an engine enters a reverse driving condition at a certain rotation speed, fuel gas injection is stopped, air directly flows into a three-way catalyst through a cylinder, oxygen storage amount in the three-way catalyst is gradually increased, during the process, oxygen content in tail gas downstream of the three-way catalyst is gradually increased until oxygen in the three-way catalyst is fully stored, and oxygen content in the downstream tail gas reaches a limit value; in the process, the voltage value measured by the switching oxygen sensor at the downstream of the three-way catalyst is gradually reduced until the voltage value is lower than the limit value, and the time from the start of reverse dragging to the time when the voltage value is lower than the limit value, namely the time from the reverse dragging to the oxygen storage of the three-way catalyst, reflects the actual oxygen storage capacity of the current catalyst; in the process, the lambda calculated by the TWC physical model reflects the theoretical oxygen storage capacity of the catalyst when the time from the backward dragging to the time higher than the limit value, namely the time from the backward dragging to the oxygen storage of the physical model; the ratio (actual time/theoretical time) of the two reflects the ratio of the current maximum oxygen storage capacity to the theoretical maximum oxygen storage capacity, namely the aging coefficient of the current catalyst.
From the above, the three-way catalyst aging diagnosis method provided by the embodiment of the invention can calculate based on the oxygen storage and chemical reaction process of the TWC physical model, and output the downstream lambda variation condition of the TWC; and when the engine enters a reverse towing working condition, calculating the time from the start of reverse towing to the time when the detection voltage of the switch oxygen sensor is lower than a certain value, and simultaneously calculating the time from the start of reverse towing to the time when the downstream lambda of the TWC physical model is higher than a certain value, wherein the ratio of the two is the TWC aging coefficient.
Example 2
According to an aspect of the embodiment of the present invention, there is also provided a three-way catalyst degradation diagnosis apparatus, fig. 3 is a schematic diagram of the three-way catalyst degradation diagnosis apparatus according to the embodiment of the present invention, as shown in fig. 3, including: the detection module 31, the first acquisition module 33, the second acquisition module 35, the first determination module 37 and the second determination module 39. The three-way catalyst degradation diagnosis device will be described in detail below.
The detection module 31 is used for monitoring the actual oxygen storage amount in the target three-way catalyst to obtain a monitoring result when the engine is determined to be in a reverse towing working condition;
a first obtaining module 33, configured to obtain an actual duration used when the actual oxygen storage amount reaches the oxygen content limit value when the monitoring result indicates that the actual oxygen storage amount reaches the oxygen content limit value;
a second obtaining module 35, configured to obtain a theoretical duration used when the theoretical oxygen storage amount of the target three-way catalyst reaches the oxygen content limit value;
a first determining module 37 for determining an aging coefficient of the target three-way catalyst based on the actual time period and the theoretical time period;
a second determination module 39 is configured to determine a degree of aging of the three-way catalyst based on the aging coefficient.
Here, the detection module 31, the first acquisition module 33, the second acquisition module 35, the first determination module 37, and the second determination module 39 correspond to steps S102 to S110 in embodiment 1, and the plurality of modules are the same as the examples and the application scenarios implemented by the corresponding steps, but are not limited to those disclosed in embodiment 1.
It can be seen from the above that, in the embodiment of the present invention, the detection module 31 may be used to monitor the actual oxygen storage amount in the target three-way catalyst when determining that the engine is in the reverse driving condition, so as to obtain a monitoring result; the first obtaining module 33 may then be used to obtain the actual time period used when the actual oxygen storage amount reaches the oxygen content limit value when the monitoring result indicates that the actual oxygen storage amount reaches the oxygen content limit value; the second acquisition module 35 can then be used to acquire the theoretical duration of time that the theoretical oxygen storage capacity of the target three-way catalyst has reached the oxygen content limit; the aging factor of the target three-way catalyst can then be determined by means of the first determination module 37 on the basis of the actual time period and the setpoint time period; finally, the degree of aging of the three-way catalyst can be determined by means of the second determination module 39 on the basis of the aging coefficient. According to the three-way catalyst aging diagnosis device provided by the embodiment of the invention, the purpose of determining the aging coefficient of the three-way catalyst based on the aging coefficient after the theoretical time length and the actual time length used when the theoretical oxygen storage amount of the three-way catalyst reaches the oxygen content limit value are achieved, and the aging degree of the three-way catalyst is determined based on the aging coefficient is achieved, so that the technical effect of improving the accuracy of detecting the aging degree of the three-way catalyst is achieved, and the technical problem that the accuracy of a detection result is insufficient due to the fact that the method for detecting the aging state of the three-way catalyst in the related technology cannot be frequently detected is solved.
Optionally, the detection module includes: the first determining unit is used for determining that the engine enters a reverse towing working condition when the engine is detected to be in an idle state, and generating a monitoring signal; and the sending unit is used for sending the monitoring signal to the switch oxygen sensor so as to trigger the switch oxygen sensor to monitor the actual oxygen storage amount of the three-way catalyst to obtain a monitoring result, wherein the switch oxygen sensor is arranged at a preset position at the downstream of the three-way catalyst.
Optionally, the first acquisition module includes: the detection unit is used for detecting whether gas flows into the target three-way catalyst through the cylinder when the engine is determined to be in a reverse-dragging working condition, so as to obtain a detection result; and the triggering unit is used for triggering the timer to start timing when the detection result indicates that gas flows into the target three-way catalyst through the cylinder until the monitoring result indicates that the actual oxygen storage amount reaches the oxygen content limit value.
Optionally, the first acquisition module includes: the first acquisition unit is used for acquiring the real-time oxygen storage amount in the target three-way catalyst monitored by the switch oxygen sensor; the conversion unit is used for converting the real-time oxygen storage amount into a real-time voltage value of the engine; a second determining unit, configured to determine a first time when the real-time voltage value is lower than the voltage threshold; the second acquisition unit is used for acquiring the actual duration used when the actual oxygen storage amount reaches the oxygen content limit value based on the second moment when the engine enters the reverse towing mode and the first moment.
Optionally, the second acquisition module includes: a third obtaining unit, configured to obtain a physical model of the target three-way catalyst, where the physical model is a model that is generated in advance based on structural information of the target three-way catalyst; a third determination unit for determining an excess air ratio downstream of the target three-way catalyst based on the physical model; and a fourth acquisition unit configured to acquire the theoretical duration based on a third timing at which the engine enters the reverse towing mode and a fourth timing at which the excess air ratio is higher than a predetermined coefficient.
Optionally, the apparatus further comprises: and the fourth determining unit is used for determining that the engine exits the reverse driving condition before determining the aging coefficient of the target three-way catalyst based on the actual time length and the theoretical time length.
Example 3
According to an aspect of the embodiment of the present invention, there is also provided a computer-readable storage medium, the computer-readable storage medium including a stored program, wherein the apparatus in which the computer-readable storage medium is controlled to execute any one of the three-way catalyst degradation diagnosis methods when the program is run.
Example 4
According to an aspect of the embodiment of the present invention, there is also provided a processor for running a program, wherein the program runs to execute any one of the three-way catalyst degradation diagnosis methods.
The foregoing embodiment numbers of the present invention are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.
In the foregoing embodiments of the present invention, the descriptions of the embodiments are emphasized, and for a portion of this disclosure that is not described in detail in this embodiment, reference is made to the related descriptions of other embodiments.
In the several embodiments provided in the present application, it should be understood that the disclosed technology content may be implemented in other manners. The above-described embodiments of the apparatus are merely exemplary, and the division of the units, for example, may be a logic function division, and may be implemented in another manner, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some interfaces, units or modules, or may be in electrical or other forms.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied essentially or in part or all of the technical solution or in part in the form of a software product stored in a storage medium, including instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a removable hard disk, a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (9)
1. A three-way catalyst aging diagnosis method, characterized by comprising:
when the engine is determined to be in a reverse driving working condition, monitoring the actual oxygen storage amount in the target three-way catalyst to obtain a monitoring result;
when the monitoring result shows that the actual oxygen storage amount reaches the oxygen content limit value, acquiring the actual time length used when the actual oxygen storage amount reaches the oxygen content limit value;
acquiring theoretical duration used when the theoretical oxygen storage amount of the target three-way catalyst reaches the oxygen content limit value;
determining an aging coefficient of the target three-way catalyst based on the actual time length and the theoretical time length;
determining a degree of aging of the three-way catalyst based on the aging coefficient;
the method for obtaining the theoretical duration used when the theoretical oxygen storage amount of the target three-way catalyst reaches the oxygen content limit value comprises the following steps:
acquiring a physical model of the target three-way catalyst, wherein the physical model is a model which is generated in advance based on structural information of the target three-way catalyst;
determining an excess air ratio downstream of the target three-way catalyst based on the physical model;
and acquiring the theoretical duration based on a third moment when the engine enters the reverse traction mode and a fourth moment when the excess air ratio is higher than a preset coefficient.
2. The method of claim 1, wherein monitoring the actual oxygen storage in the target three-way catalyst when the engine is determined to be in the reverse driving condition, comprises:
when the engine is detected to be in an idle state, determining that the engine enters the reverse towing working condition, and generating a monitoring signal;
and sending the monitoring signal to a switching oxygen sensor so as to trigger the switching oxygen sensor to monitor the actual oxygen storage amount of the three-way catalyst to obtain a monitoring result, wherein the switching oxygen sensor is arranged at a preset position at the downstream of the three-way catalyst.
3. The method of claim 1, wherein obtaining an actual length of time that the actual oxygen storage amount has reached the oxygen content limit comprises:
when the engine is determined to be in the reverse driving working condition, detecting whether gas flows into the target three-way catalyst through the cylinder or not to obtain a detection result;
and when the detection result shows that gas flows into the target three-way catalyst through the cylinder, triggering a timer to start timing until the monitoring result shows that the actual oxygen storage amount reaches the oxygen content limit value.
4. The method of claim 2, wherein obtaining an actual length of time that the actual oxygen storage amount has reached the oxygen content limit comprises:
acquiring the real-time oxygen storage amount in the target three-way catalyst monitored by the switch oxygen sensor;
converting the real-time oxygen storage amount into a real-time voltage value of the engine;
determining a first moment when the real-time voltage value is lower than a voltage threshold value;
and acquiring the actual duration used when the actual oxygen storage amount reaches the oxygen content limit value based on the second moment when the engine enters the reverse towing mode and the first moment.
5. The method according to any one of claims 1 to 4, characterized in that before determining the aging coefficient of the target three-way catalyst based on the actual time period and the theoretical time period, the method further comprises: and determining that the engine exits the reverse driving condition.
6. A three-way catalyst degradation diagnosis device, characterized by comprising:
the detection module is used for monitoring the actual oxygen storage amount in the target three-way catalyst when the engine is determined to be in the reverse towing working condition, so as to obtain a monitoring result;
the first acquisition module is used for acquiring the actual duration used when the actual oxygen storage amount reaches the oxygen content limit value when the monitoring result shows that the actual oxygen storage amount reaches the oxygen content limit value;
the second acquisition module is used for acquiring theoretical duration used when the theoretical oxygen storage amount of the target three-way catalyst reaches the oxygen content limit value;
the first determining module is used for determining the aging coefficient of the target three-way catalyst based on the actual time length and the theoretical time length;
a second determining module configured to determine a degree of aging of the three-way catalyst based on the aging coefficient;
the second acquisition module includes:
a third obtaining unit, configured to obtain a physical model of the target three-way catalyst, where the physical model is a model that is generated in advance based on structural information of the target three-way catalyst;
a third determination unit configured to determine an excess air ratio downstream of the target three-way catalyst based on the physical model;
and a fourth acquisition unit configured to acquire the theoretical duration based on a third time at which the engine enters the reverse towing mode and a fourth time at which the excess air ratio is higher than a predetermined coefficient.
7. The apparatus of claim 6, wherein the detection module comprises:
the first determining unit is used for determining that the engine enters the reverse driving working condition when the engine is detected to be in an idle state, and generating a monitoring signal;
and the sending unit is used for sending the monitoring signal to the switch oxygen sensor so as to trigger the switch oxygen sensor to monitor the actual oxygen storage amount of the three-way catalyst to obtain a monitoring result, wherein the switch oxygen sensor is arranged at a preset position at the downstream of the three-way catalyst.
8. A computer-readable storage medium, characterized in that the computer-readable storage medium includes a stored program, wherein the program, when run, controls a device in which the computer-readable storage medium is located to execute the three-way catalyst degradation diagnosis method according to any one of claims 1 to 5.
9. A processor for running a program, wherein the program runs to execute the three-way catalyst degradation diagnosis method according to any one of claims 1 to 5.
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