CN114776422A - Three-way catalyst aging diagnosis method and device and computer readable storage medium - Google Patents
Three-way catalyst aging diagnosis method and device and computer readable storage medium Download PDFInfo
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- 230000032683 aging Effects 0.000 title claims abstract description 80
- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000003745 diagnosis Methods 0.000 title abstract description 18
- 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 28
- 230000003197 catalytic effect Effects 0.000 claims abstract description 10
- 239000007789 gas Substances 0.000 claims description 14
- 238000002405 diagnostic procedure Methods 0.000 claims description 6
- 238000005516 engineering process Methods 0.000 abstract description 5
- 230000015556 catabolic process Effects 0.000 description 6
- 238000006731 degradation reaction Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 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
- 230000008878 coupling Effects 0.000 description 3
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2550/00—Monitoring or diagnosing the deterioration of exhaust systems
- F01N2550/02—Catalytic activity of catalytic converters
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- 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
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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
- 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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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 drag-down working condition, monitoring the actual oxygen storage amount in the target three-way catalytic converter 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; obtaining the theoretical time 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 invention solves the technical problem of insufficient accuracy of detection results caused by the fact that the method for detecting the aging state of the three-way catalyst in the related technology cannot frequently detect.
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
At present, a natural gas engine generally adopts a three-way catalyst to treat generated tail gas, and the three-way catalyst can convert CO, HC and NOx into CO2, H2O and N2 through catalytic oxidation and reduction reactions; however, in the long-time running process of the natural gas engine, the three-way catalyst is in a high-temperature water-rich vapor environment for a long time, so that the three-way catalyst is subjected to hydrothermal aging; therefore, the aging condition of the three-way catalyst needs to be judged, and the maximum oxygen storage amount of the three-way catalyst is measured by adopting a mode of actively charging and discharging oxygen to penetrate through the three-way catalyst so as to judge the aging state of the current catalyst; however, the active determination method results in emission loss, and thus cannot detect frequently, resulting in a decrease in detection accuracy.
In view of the above problems, no effective solution has been proposed.
Disclosure of Invention
The embodiment of the invention provides a three-way catalyst aging diagnosis method and device and a computer readable storage medium thereof, which at least solve the technical problem that the method for detecting the aging state of the three-way catalyst in the related technology cannot frequently detect and results in insufficient accuracy of detection results.
According to an aspect of an embodiment of the present invention, there is provided a three-way catalyst aging diagnostic method including: when the engine is determined to be in the back-dragging 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; obtaining the theoretical time 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.
Optionally, when it is determined that the engine is in the reverse-dragging operating condition, monitoring an actual oxygen storage amount in the target three-way catalyst to obtain a monitoring result, comprising: when the engine is detected to be in an idle state, determining that the engine enters the reverse dragging working condition, and generating a monitoring signal; and sending the monitoring signal to a 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 the downstream preset position of the three-way catalyst.
Optionally, obtaining the actual time duration used when the actual oxygen storage amount reaches the oxygen content limit value comprises: when the engine is determined to be in the reverse dragging working condition, detecting whether gas flows into the target three-way catalytic converter through the cylinder or not to obtain a detection result; and triggering a timer to start timing when the detection result shows that gas flows into the target three-way catalytic converter through the cylinder 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 comprises: acquiring 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 time used when the actual oxygen storage amount reaches the oxygen content limit value based on the second moment when the engine enters the drag-down mode and the first moment.
Optionally, obtaining a theoretical duration for use when the theoretical oxygen storage amount of the target three-way catalyst reaches the oxygen content limit value comprises: acquiring a physical model of the target three-way catalyst, wherein the physical model is a model 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; the theoretical period is obtained based on a third timing at which the engine enters the tow-back mode and a fourth timing at which the excess air factor is higher than a predetermined factor.
Optionally, before determining the aging factor of the target three-way catalyst based on the actual duration and the theoretical duration, the method further comprises: determining that the engine is exiting the tow-back condition.
According to an aspect of an 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 to obtain a monitoring result when the engine is determined to be in the reverse dragging working condition; the first obtaining module is used for obtaining the actual time 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 the theoretical time used when the theoretical oxygen storage amount of the target three-way catalyst reaches the oxygen content limit value; a first determination module to determine an aging coefficient of the target three-way catalyst based on the actual time length and the theoretical time length; a second determination module to determine a degree of aging of the three-way catalyst based on the aging factor.
Optionally, the detection module includes: the first determination unit is used for determining that the engine enters the towing working condition and generating a monitoring signal when the engine is detected to be in an idle state; 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 the downstream preset position of the three-way catalyst.
Optionally, the first obtaining module includes: the detection unit is used for detecting whether gas flows into the target three-way catalyst through the cylinder or not to obtain a detection result when the engine is determined to be in the reverse dragging working condition; and the triggering unit is used for triggering a timer to start timing when the detection result shows that gas flows into the target three-way catalytic converter through the cylinder until the monitoring result shows that the actual oxygen storage amount reaches the oxygen content limit value.
Optionally, the first obtaining 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; the second determining unit is used for determining a first moment when the real-time voltage value is lower than a voltage threshold value; and the second acquisition unit is used for acquiring the actual time used when the actual oxygen storage amount reaches the oxygen content limit value based on the second moment when the engine enters the towing mode and the first moment.
Optionally, the second obtaining 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 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; a fourth acquisition unit configured to acquire the theoretical period based on a third timing at which the engine enters the tow-back mode and a fourth timing at which the excess air factor is higher than a predetermined factor.
Optionally, the apparatus further comprises: a fourth determination unit that determines that the engine is exiting the reverse dragging operation condition before determining an aging factor of the target three-way catalyst based on the actual time period and the theoretical time period.
According to an aspect of the embodiments of the present invention, there is also provided a computer-readable storage medium including a stored program, wherein the program, when executed, controls an apparatus in which the computer-readable storage medium is located to perform any one of the three-way catalyst aging diagnosis methods.
According to an aspect of the embodiment of the invention, a processor is further provided, and the processor is used for running a program, wherein the program is used for executing any one of the three-way catalyst aging diagnosis methods during running.
In the embodiment of the invention, when the engine is determined to be in the back-dragging 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; obtaining the theoretical time 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 aging diagnosis method for the three-way catalyst, provided by the embodiment of the invention, the purposes of obtaining the theoretical time and the actual time used when the theoretical oxygen storage amount of the three-way catalyst reaches the oxygen content limit value, determining the aging coefficient of the three-way catalyst by using the obtained theoretical time and the actual time, and determining the aging degree of the three-way catalyst based on the aging coefficient are achieved, so that the technical effect of improving the accuracy of detecting the aging degree of the three-way catalyst is realized, and the technical problem of insufficient accuracy of a detection result caused by the fact that the method for detecting the aging state of the three-way catalyst in the related technology cannot frequently detect 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 embodiment(s) of the invention and together with the description serve to explain the invention without limiting 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 invention;
FIG. 2 is a flow chart of a TWC aging diagnostic method according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a three-way catalyst degradation diagnostic apparatus according to an embodiment of the invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in other sequences than those illustrated or described herein. Moreover, 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
According to an embodiment of the present invention, there is provided a method embodiment of a TWC aging diagnosis method, it is noted that the steps illustrated in the flowcharts of the figures may be executed in a computer system such as a set of computer executable instructions, and that while a logical order is illustrated in the flowcharts, in some cases, the steps illustrated or described may be executed in an order different from that herein.
Fig. 1 is a flowchart of a three-way catalyst degradation diagnosis method according to an embodiment of the invention, which includes the steps of, as shown in fig. 1:
step S102, when the engine is determined to be in a back-dragging 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 drag-down working 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 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, the actual time length that elapses when the actual oxygen storage amount reaches the oxygen content threshold is obtained.
Step S106, obtaining the theoretical time used when the theoretical oxygen storage amount of the target three-way catalyst reaches the oxygen content limit value;
alternatively, the theoretical length of time required for the theoretical oxygen storage capacity of the three-way catalyst to reach the oxygen content limit is determined.
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 judged based on the relationship between the two parameters of the actual duration and the theoretical duration.
Step S110, the aging degree of the three-way catalyst is determined based on the aging coefficient.
Therefore, in the embodiment of the invention, the actual oxygen storage amount in the target three-way catalyst can be monitored to obtain the monitoring result when the engine is determined to be in the reverse dragging working condition; then, 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; then, the theoretical time 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 duration and the theoretical duration; finally, the degree of aging of the three-way catalyst may be determined based on the aging factor. According to the aging diagnosis method for the three-way catalyst, provided by the embodiment of the invention, the purposes of obtaining the theoretical time and the actual time used when the theoretical oxygen storage amount of the three-way catalyst reaches the oxygen content limit value, determining the aging coefficient of the three-way catalyst by using the obtained theoretical time and the actual time, and determining the aging degree of the three-way catalyst based on the aging coefficient are achieved, so that the technical effect of improving the accuracy of detecting the aging degree of the three-way catalyst is realized, and the technical problem of insufficient accuracy of a detection result caused by the fact that the method for detecting the aging state of the three-way catalyst in the related technology cannot frequently detect is solved.
As an alternative embodiment, when it is determined that the engine is in the reverse-dragging operating condition, the actual oxygen storage amount in the target three-way catalyst is monitored, and the monitoring result is obtained, including: when the engine is detected to be in an idle state, determining that the engine enters a towing working condition, and generating a monitoring signal; and sending a monitoring signal to a 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 downstream preset position of the three-way catalyst.
In the above optional embodiment, when it is detected that the transmitter is in an idle state, it is determined that the transmitter enters a drag-down working condition, a detection signal is generated and sent to the switch oxygen sensor, so that the switch oxygen sensor detects an actual oxygen storage amount of the three-way catalyst.
As an alternative embodiment, the actual time period used when the actual oxygen storage amount reaches the oxygen content limit value is obtained, which includes: when the engine is determined to be in a back-dragging working condition, detecting whether gas flows into a target three-way catalyst through a cylinder or not to obtain a detection result; and triggering a 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-dragging condition, and when it is detected that gas is flowing 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, the actual time period used when the actual oxygen storage amount reaches the oxygen content limit value is obtained, which includes: acquiring real-time oxygen storage amount in a target three-way catalyst monitored by a 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 the voltage threshold; and acquiring the actual time used when the actual oxygen storage amount reaches the oxygen content limit value based on the second moment when the engine enters the drag-down 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 switching 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, 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 drag-down mode.
As an alternative example, obtaining the theoretical time 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 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; the theoretical period is obtained based on a third timing at which the engine enters the reverse-towing mode and a fourth timing at which the excess air factor is higher than a predetermined factor.
In the above-described alternative embodiment, the physical model of the three-way catalyst that is generated in advance is first obtained, 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 factor of the target three-way catalyst based on the actual time length and the theoretical time length, the method further includes: and determining that the engine is out of the reverse dragging working condition.
FIG. 2 is a flowchart of a TWC aging diagnosis method according to an embodiment of the invention, as shown in FIG. 2, when the engine enters a drag-down condition within a certain rotation speed, the gas injection is stopped, air directly flows into the three-way catalyst through the cylinder, the oxygen storage amount in the three-way catalyst gradually increases, and in the process, the oxygen content in the tail gas downstream of the three-way catalyst gradually increases until the oxygen storage in the three-way catalyst is full, and the oxygen content in the tail gas downstream reaches a limit value; in the process, the voltage value measured by the downstream switch oxygen sensor 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 dragging to the time when the voltage value is lower than the limit value, namely the time from the dragging to the full oxygen storage of the three-way catalyst reflects the actual oxygen storage capacity of the current catalyst; in the process, the time from the start of dragging to the time when lambda is higher than the limit value, which is calculated by the TWC physical model, is the time from the start of dragging to the full oxygen storage of the physical model, and reflects the theoretical oxygen storage capacity of the catalyst; the ratio of the two (actual time/theoretical time) 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 output the change condition of the downstream lambda of the TWC based on the oxygen storage and chemical reaction process calculation of the TWC physical model; and calculating the time from the start of dragging to the time that the detection voltage of the switch oxygen sensor is lower than a certain value after the engine enters the dragging working condition, and simultaneously calculating the time from the start of dragging to the time that the downstream lambda of the TWC physical model is higher than a certain value, wherein the ratio of the two is the aging coefficient of the TWC.
Example 2
According to an aspect of an embodiment of the present invention, there is also provided a three-way catalyst degradation diagnostic apparatus, and fig. 3 is a schematic diagram of the three-way catalyst degradation diagnostic apparatus according to the embodiment of the present invention, as shown in fig. 3, including: a detection module 31, a first acquisition module 33, a second acquisition module 35, a first determination module 37, and a 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 the dragging working condition;
the first obtaining module 33 is configured to obtain an actual time 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 obtaining module 35 is configured to obtain a theoretical duration used when the theoretical oxygen storage amount of the target three-way catalyst reaches an oxygen content limit value;
a first determination module 37 for determining an aging coefficient of the target three-way catalyst based on the actual time length and the theoretical time length;
a second determination module 39 determines a degree of aging of the three-way catalyst based on the aging factor.
It should be noted here that the detecting module 31, the first obtaining module 33, the second obtaining module 35, the first determining module 37, and the second determining module 39 correspond to steps S102 to S110 in embodiment 1, and a plurality of modules are the same as examples and application scenarios realized by the corresponding steps, but are not limited to what is disclosed in embodiment 1.
As can be seen from the above, 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 it is determined that the engine is in the drag-down condition, so as to obtain the monitoring result; then, when the monitoring result shows that the actual oxygen storage amount reaches the oxygen content limit value, the first obtaining module 33 may be used to obtain 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 by means of the second obtaining module 35; 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 length and the theoretical time length; finally, the aging degree of the three-way catalyst can be determined by means of the second determination module 39 on the basis of the aging factor. According to the aging diagnosis device for the three-way catalyst, provided by the embodiment of the invention, the purposes of obtaining the theoretical time and the actual time used when the theoretical oxygen storage amount of the three-way catalyst reaches the oxygen content limit value, determining the aging coefficient of the three-way catalyst by using the obtained theoretical time and the actual time, and determining the aging degree of the three-way catalyst based on the aging coefficient are achieved, so that the technical effect of improving the accuracy of detecting the aging degree of the three-way catalyst is realized, and the technical problem of insufficient accuracy of a detection result caused by the fact that a method for detecting the aging state of the three-way catalyst in the related technology cannot frequently detect is solved.
Optionally, the detection module comprises: the first determining unit is used for determining that the engine enters a dragging working condition and generating a monitoring signal when the engine is detected to be in an idle state; 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, and obtain a monitoring result, wherein the switch oxygen sensor is arranged at a downstream preset position of the three-way catalyst.
Optionally, the first obtaining module includes: the detection unit is used for detecting whether gas flows into the target three-way catalytic converter through the cylinder or not 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 shows that gas flows into the target three-way catalytic converter through the cylinder until the monitoring result shows that the actual oxygen storage amount reaches the oxygen content limit value.
Optionally, the first obtaining 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; the second determining unit is used for determining a first moment when the real-time voltage value is lower than the voltage threshold; and the second acquisition unit is used for acquiring the actual time used when the actual oxygen storage amount reaches the oxygen content limit value based on the second moment when the engine enters the drag-down mode and the first moment.
Optionally, the second obtaining 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 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; a fourth acquisition unit configured to acquire the theoretical period based on a third timing at which the engine enters the reverse towing mode and a fourth timing at which the excess air factor is higher than a predetermined factor.
Optionally, the apparatus further comprises: and the fourth determination unit is used for determining that the engine is out of the reverse dragging working condition before determining the aging coefficient of the target three-way catalytic converter based on the actual time length and the theoretical time length.
Example 3
According to an aspect of the embodiments of the present invention, there is also provided a computer-readable storage medium including a stored program, wherein when the program is executed, the apparatus in which the computer-readable storage medium is located is controlled to perform any one of the three-way catalyst aging diagnosis methods.
Example 4
According to an aspect of the embodiment of the invention, a processor is further provided, and the processor is used for running the program, wherein the program executes any one of the three-way catalyst aging diagnosis methods during running.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
In the above embodiments of the present invention, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In the embodiments provided in the present application, it should be understood that the disclosed technical content can be implemented in other manners. The above-described apparatus embodiments are merely illustrative, and for example, the division of the units may be a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or may be integrated into another system, or some features may be omitted, or may not be executed. In addition, the shown or discussed coupling or direct coupling or communication connection between each other may be an indirect coupling or communication connection through some interfaces, units or modules, and may be electrical or in 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 can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit may be implemented in the form of hardware, or may also be implemented in the form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute 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), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A three-way catalyst aging diagnostic method, characterized by comprising:
when the engine is determined to be in a drag-down working condition, monitoring the actual oxygen storage amount in the target three-way catalytic converter 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;
obtaining the theoretical time 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.
2. The method of claim 1, wherein monitoring the actual amount of oxygen stored within the target three-way catalyst to obtain a monitored result when the engine is determined to be in a tow-over condition comprises:
when the engine is detected to be in an idle state, determining that the engine enters the reverse dragging working condition, and generating a monitoring signal;
and sending the monitoring signal to a 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 the downstream preset position of the three-way catalyst.
3. The method of claim 1, wherein obtaining the actual length of time used when the actual oxygen storage amount reaches the oxygen content limit comprises:
when the engine is determined to be in the reverse dragging working condition, detecting whether gas flows into the target three-way catalyst through the cylinder or not to obtain a detection result;
and triggering a timer to start timing until the monitoring result shows that the actual oxygen storage amount reaches the oxygen content limit value when the detection result shows that gas flows into the target three-way catalytic converter through the cylinder.
4. The method of claim 2, wherein obtaining the actual length of time used when the actual oxygen storage amount reaches the oxygen content limit comprises:
acquiring 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 time used when the actual oxygen storage amount reaches the oxygen content limit value based on the second moment when the engine enters the drag-down mode and the first moment.
5. The method of claim 1, wherein obtaining a theoretical length of time for use when a theoretical oxygen storage amount of the target three-way catalyst reaches the oxygen content limit comprises:
acquiring a physical model of the target three-way catalyst, wherein the physical model is a model 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;
the theoretical period is obtained based on a third timing at which the engine enters the towing mode and a fourth timing at which the excess air factor is higher than a predetermined factor.
6. The method according to any one of claims 1 to 5, characterized in that, before determining the aging coefficient of the target three-way catalyst based on the actual time length and the theoretical time length, the method further comprises: determining that the engine is exiting the tow-back condition.
7. A three-way catalyst aging diagnostic apparatus, characterized by comprising:
the detection module 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 the reverse dragging working condition;
the first obtaining module is used for obtaining the actual time 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 the theoretical time used when the theoretical oxygen storage amount of the target three-way catalyst reaches the oxygen content limit value;
a first determination module to determine an aging coefficient of the target three-way catalyst based on the actual time length and the theoretical time length;
a second determination module to determine a degree of aging of the three-way catalyst based on the aging factor.
8. The apparatus of claim 7, wherein the detection module comprises:
the first determination unit is used for determining that the engine enters the towing working condition and generating a monitoring signal when the engine is detected to be in an idle state;
and the sending unit is used for sending the 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 the downstream preset position of the three-way catalyst.
9. A computer-readable storage medium, characterized in that the computer-readable storage medium includes a stored program, wherein the computer-readable storage medium controls an apparatus on which the computer-readable storage medium is stored to execute the three-way catalyst aging diagnostic method according to any one of claims 1 to 6 when the program is executed.
10. A processor configured to execute a program, wherein the program executes to perform the three-way catalyst aging diagnostic method according to any one of claims 1 to 6.
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