CN104832305A - Oxygen storage capacity detection method and system for automobile catalyst converter and vehicle - Google Patents
Oxygen storage capacity detection method and system for automobile catalyst converter and vehicle Download PDFInfo
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- CN104832305A CN104832305A CN201410783791.XA CN201410783791A CN104832305A CN 104832305 A CN104832305 A CN 104832305A CN 201410783791 A CN201410783791 A CN 201410783791A CN 104832305 A CN104832305 A CN 104832305A
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- storage capacity
- oxygen storage
- catalytic device
- automobile catalytic
- excess air
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 133
- 239000001301 oxygen Substances 0.000 title claims abstract description 133
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 133
- 238000001514 detection method Methods 0.000 title claims abstract description 23
- 239000003054 catalyst Substances 0.000 title abstract description 18
- 239000007789 gas Substances 0.000 claims abstract description 80
- 238000002347 injection Methods 0.000 claims abstract description 47
- 239000007924 injection Substances 0.000 claims abstract description 47
- 238000000034 method Methods 0.000 claims abstract description 38
- 230000003197 catalytic effect Effects 0.000 claims description 103
- 239000000446 fuel Substances 0.000 claims description 44
- 238000005259 measurement Methods 0.000 claims description 23
- 230000015556 catabolic process Effects 0.000 claims description 7
- 238000006731 degradation reaction Methods 0.000 claims description 7
- 238000012937 correction Methods 0.000 claims description 5
- 230000008901 benefit Effects 0.000 abstract description 5
- 239000000203 mixture Substances 0.000 abstract 2
- 230000008859 change Effects 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000012512 characterization method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
Classifications
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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
Abstract
The invention provides an oxygen storage capacity detection method for an automobile catalyst converter. The method comprises the following steps: after gas mixture closed-loop control is closed, an excess air coefficient of an initial gas mixture is obtained; whether the excess air coefficient is within a preset standard range is judged; if not, the current oil injection amount is judged, and the excess air coefficient is amended; and after the excess air coefficient is amended to the preset standard range, the oxygen storage capacity of the automobile catalyst converter is obtained by utilizing the oxygen storage capacity detection method. According to the oxygen storage capacity detection method of the automobile catalyst converter, the oxygen storage capacity detection method has the advantages that the detection precision of the oxygen storage capacity of the automobile catalyst converter is high. The invention also provides an oxygen storage capacity detection system for the automobile catalyst converter and a vehicle.
Description
Technical field
The present invention relates to automobile technical field, particularly a kind of oxygen storage capacity detecting method of automobile catalytic device, system and vehicle.
Background technique
Oxygen storage capacity is an important indicator of automobile catalytic device.In automotive development work, needing the oxygen storage capacity by measuring catalyst converter, judging the degradation of catalyst converter according to oxygen storage capacity.
After the method for measurement of the oxygen storage capacity of the catalyst converter in correlation technique does not consider that closing mixed gas closed loop control enters opened loop control, because engine control system is insufficient to mixed gas self study, initial excess air coefficient may be caused to exceed the scope of permission, thus causing the measurement result of the oxygen storage capacity of catalyst converter inaccurate, reference value is lower.
Summary of the invention
The present invention is intended at least one of solve the problems of the technologies described above.
For this reason, one object of the present invention is the oxygen storage capacity detecting method proposing a kind of automobile catalytic device.The method has the high advantage of the testing precision of the oxygen storage capacity of automobile catalytic device.
Another object of the present invention is the oxygen storage capacity detection system proposing a kind of automobile catalytic device.
Another object of the present invention is to propose a kind of vehicle.
To achieve these goals, the embodiment of a first aspect of the present invention discloses a kind of oxygen storage capacity detecting method of automobile catalytic device, the front and back of described automobile catalytic device are respectively equipped with front lambda sensor and post oxygen sensor, describedly to comprise the following steps: after the closed loop control of closedown mixed gas, obtain the excess air coefficient of initial mixing gas; Judge whether the excess air coefficient of described initial mixing gas is positioned at preset standard scope; If not, then regulate current fuel injection quantity, described excess air coefficient is revised; And when after described excess air coefficient correction to described preset standard scope, utilize oxygen storage capacity method of measurement to obtain the oxygen storage capacity of described automobile catalytic device further.
Owing to closing after mixed gas closed loop control enters opened loop control, engine control system is insufficient to mixed gas self study, the excess air coefficient of initial mixing gas likely exceeds the scope of permission, thus causes the measurement result of the oxygen storage capacity of automobile catalytic device inaccurate.Therefore, the oxygen storage capacity detecting method of the automobile catalytic device of the embodiment of the present invention, after the closed loop control of closedown mixed gas enters opened loop control, by judging the excess air coefficient of initial mixing gas and revising, make after the excess air coefficient of initial mixing gas adjusts to the scope of permission, carry out the measurement of the oxygen storage capacity of automobile catalytic device again, thus effectively can improve the measuring accuracy of the oxygen storage capacity of automobile catalytic device.
In addition, the oxygen storage capacity detecting method of automobile catalytic device according to the above embodiment of the present invention can also have following additional technical characteristics:
In some instances, described oxygen storage capacity method of measurement, comprising: increase current fuel injection quantity to the first and preset fuel injection quantity, delay predetermined time is until the magnitude of voltage of described post oxygen sensor rises to first threshold; Reduce current fuel injection quantity to the second and preset fuel injection quantity until the magnitude of voltage of described post oxygen sensor drops to Second Threshold, and to record excess air coefficient be reach the moment of 1 and drop to the moment of predetermined coefficient value, wherein, described Second Threshold is less than described first threshold, and described predetermined coefficient value is less than described 1; Obtain the flow of mixed gas; Be the oxygen storage capacity that the moment reaching 1 and the moment dropping to predetermined coefficient value obtain described automobile catalytic device according to the flow of described mixed gas, described excess air coefficient.
In some instances, obtained the oxygen storage capacity of described automobile catalytic device by following formula, wherein, described formula is:
Wherein, described OSC is the oxygen storage capacity of described automobile catalytic device, described t1 to be described excess air coefficient be reach 1 moment, described t2 is the moment that described excess air coefficient drops to predetermined coefficient value, described MAF is the flow of described mixed gas, described △ λ presets after fuel injection quantity to described second for reducing fuel injection quantity, the excess air coefficient of described automobile catalytic device forward slip value gas stablize after value and 1 difference.
In some instances, also comprise: the degradation judging described automobile catalytic device according to the oxygen storage capacity of described automobile catalytic device.
The embodiment of second aspect present invention discloses a kind of oxygen storage capacity detection system of automobile catalytic device, comprising: be arranged on the front lambda sensor before automobile catalytic device and the post oxygen sensor after being arranged on described automobile catalytic device; Processor, described processor is used for after the closed loop control of cut out mixed gas, obtain the excess air coefficient of initial mixing gas, and judge whether the excess air coefficient of described initial mixing gas is positioned at preset standard scope, if not, then regulate current fuel injection quantity, described excess air coefficient is revised, and when after described excess air coefficient correction to described preset standard scope, utilize oxygen storage capacity method of measurement to obtain the oxygen storage capacity of described automobile catalytic device further.
The oxygen storage capacity detection system of the automobile catalytic device of the embodiment of the present invention, after the closed loop control of closedown mixed gas enters opened loop control, by judging the excess air coefficient of initial mixing gas and revising, make after the excess air coefficient of initial mixing gas adjusts to the scope of permission, carry out the measurement of the oxygen storage capacity of automobile catalytic device again, thus effectively can improve the measuring accuracy of the oxygen storage capacity of automobile catalytic device.
In addition, the oxygen storage capacity detection system of automobile catalytic device according to the above embodiment of the present invention can also have following additional technical characteristics:
In some instances, described oxygen storage capacity method of measurement, comprising: increase current fuel injection quantity to the first and preset fuel injection quantity, delay predetermined time is until the magnitude of voltage of described post oxygen sensor rises to first threshold; Reduce current fuel injection quantity to the second and preset fuel injection quantity until the magnitude of voltage of described post oxygen sensor drops to Second Threshold, and to record excess air coefficient be reach the moment of 1 and drop to the moment of predetermined coefficient value, wherein, described Second Threshold is less than described first threshold, and described predetermined coefficient value is less than described 1; Obtain the flow of mixed gas; Be the oxygen storage capacity that the moment reaching 1 and the moment dropping to predetermined coefficient value obtain described automobile catalytic device according to the flow of described mixed gas, described excess air coefficient.
In some instances, obtained the oxygen storage capacity of described automobile catalytic device by following formula, wherein, described formula is:
Wherein, described OSC is the oxygen storage capacity of described automobile catalytic device, described t1 to be described excess air coefficient be reach 1 moment, described t2 is the moment that described excess air coefficient drops to predetermined coefficient value, described MAF is the flow of described mixed gas, described △ λ presets after fuel injection quantity to described second for reducing fuel injection quantity, the excess air coefficient of described automobile catalytic device forward slip value gas stablize after value and 1 difference.
In some instances, described processor is also for judging the degradation of described automobile catalytic device according to the oxygen storage capacity of described automobile catalytic device.
The embodiment of third aspect present invention discloses a kind of vehicle, comprising: the oxygen storage capacity detection system of the automobile catalytic device according to above-described embodiment.This vehicle effectively can improve the measuring accuracy of the oxygen storage capacity of automobile catalytic device.
Additional aspect of the present invention and advantage will part provide in the following description, and part will become obvious from the following description, or be recognized by practice of the present invention.
Accompanying drawing explanation
Above-mentioned and/or additional aspect of the present invention and advantage will become obvious and easy understand from accompanying drawing below combining to the description of embodiment, wherein:
Fig. 1 is the flow chart of the oxygen storage capacity detecting method of automobile catalytic device according to an embodiment of the invention;
Fig. 2 is the flow chart of oxygen storage capacity method of measurement in the oxygen storage capacity detecting method of automobile catalytic device according to an embodiment of the invention; And
Fig. 3 is the structured flowchart of the oxygen storage capacity detection system of automobile catalytic device according to an embodiment of the invention.
Embodiment
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Being exemplary below by the embodiment be described with reference to the drawings, only for explaining the present invention, and can not limitation of the present invention being interpreted as.
In describing the invention, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end ", " interior ", orientation or the position relationship of the instruction such as " outward " are based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore limitation of the present invention can not be interpreted as.In addition, term " first ", " second " only for describing object, and can not be interpreted as instruction or hint relative importance.
In describing the invention, it should be noted that, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or connect integratedly; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals.For the ordinary skill in the art, concrete condition above-mentioned term concrete meaning in the present invention can be understood.
Below in conjunction with accompanying drawing, oxygen storage capacity detecting method, system and the vehicle according to the automobile catalytic device of the embodiment of the present invention is described.
Fig. 1 is the flow chart of the oxygen storage capacity detecting method of automobile catalytic device according to an embodiment of the invention.Wherein, the front and back of automobile catalytic device are respectively equipped with front lambda sensor and post oxygen sensor.As shown in Figure 1, the oxygen storage capacity detecting method of automobile catalytic device, comprises the steps: according to an embodiment of the invention
Step S101: after the closed loop control of closedown mixed gas, obtain the excess air coefficient of initial mixing gas.Namely, after the closed loop control of closedown mixed gas, first measure the gas excess air coefficient of initial mixing, be designated as λ 0.
Step S102: judge whether the air excess factor 0 of initial mixing gas is positioned at preset standard scope.Specifically, process of measurement can be utilized to judge, and whether the air excess factor 0 of initial mixing gas is positioned at the scope (i.e. preset standard scope) of 1 ± Δ k.Wherein, the scope that the Range Representation of 1 ± Δ k allows excess air coefficient to float, Δ k is allowable offset, can determine according to professional standard or empirical value.
Step S103: if not (if namely judging that the air excess factor 0 of initial mixing gas is not positioned at preset standard scope), then regulate current fuel injection quantity, excess air coefficient is revised.Specifically, regulate Injection Control variable FIC to change the concentration of initial mixing gas, thus air excess factor 0 is entered in the scope of 1 ± Δ k.
Step S104: when air excess factor 0 is revised to preset standard scope, utilize oxygen storage capacity method of measurement to obtain the oxygen storage capacity of automobile catalytic device further.
Owing to closing after mixed gas closed loop control enters opened loop control, engine control system is insufficient to mixed gas self study, the excess air coefficient of initial mixing gas likely exceeds the scope of permission, thus causes the measurement result of the oxygen storage capacity of automobile catalytic device inaccurate.Therefore, the oxygen storage capacity detecting method of the automobile catalytic device of the embodiment of the present invention, after the closed loop control of closedown mixed gas enters opened loop control, by judging the excess air coefficient of initial mixing gas and revising, make after the excess air coefficient of initial mixing gas adjusts to the scope of permission, carry out the measurement of the oxygen storage capacity of automobile catalytic device again, thus effectively can improve the measuring accuracy of the oxygen storage capacity of automobile catalytic device.
In one embodiment of the invention, oxygen storage capacity method of measurement, comprising:
Step S201: increase current fuel injection quantity to the first and preset fuel injection quantity, delay predetermined time is until the magnitude of voltage of post oxygen sensor rises to first threshold.Such as: on the basic value F0 of Injection Control variable FIC, increase Δ f measure, mixed gas is thickened, after a period of time (i.e. the scheduled time) when the magnitude of voltage RO2SV of post oxygen sensor rises to first threshold V_h, think that catalyst converter is taken by dense mixed gas completely.Wherein, V_h can demarcate in advance and obtain.
Step S202: reduce current fuel injection quantity to the second and preset fuel injection quantity until the magnitude of voltage of post oxygen sensor drops to Second Threshold, and to record excess air coefficient be reach the moment of 1 and drop to the moment of predetermined coefficient value, wherein, Second Threshold is less than first threshold, and predetermined coefficient value is less than 1.Namely, on the basis of F0+ Δ f, reduce 2* Δ f amount, make lean out, treat that the magnitude of voltage RO2SV of post oxygen sensor drops to V_l after a period of time, during record, excess air coefficient is reach the moment t1 of 1 and drop to the moment t2 of predetermined coefficient value.Wherein, V_l can demarcate in advance and obtain.
Step S203: the flow obtaining mixed gas, is designated as MAF.
Step S204: be the oxygen storage capacity OSC that the moment t1 reaching 1 and the moment t2 dropping to predetermined coefficient value obtain automobile catalytic device according to the flow MAF of mixed gas, excess air coefficient.
Further, be the oxygen storage capacity OSC that the moment t1 reaching 1 and the moment t2 dropping to predetermined coefficient value obtain automobile catalytic device according to the flow MAF of mixed gas, excess air coefficient, realize by following formula, wherein, described formula is:
Wherein, OSC is the oxygen storage capacity of automobile catalytic device, t1 to be excess air coefficient be reach 1 moment, t2 is the moment that excess air coefficient drops to predetermined coefficient value, MAF is the flow of mixed gas, △ λ presets after fuel injection quantity to described second for reducing fuel injection quantity, the excess air coefficient of described automobile catalytic device forward slip value gas stablize after value and 1 difference.
That is, OSC is the oxygen storage capacity of catalyst converter, unit is mg, 0.23 is the mass percent of oxygen in air, t1 is the start time of integration, refer to the moment of catalyst converter forward slip value gas saltus step from dense to rare just, be defined as this moment of the air excess factor 1=1 when catalyst converter forward slip value gas, t2 is the finish time of integration, refer to that the mixed gas after catalyst converter jumps to rare moment from dense just, namely when this moment of the air excess factor 2 just <1 of mixed gas after catalyst converter, be defined as when post oxygen sensor voltage signal RO2SV is down to moment of threshold values V_l just.MAF is air mass flow, and unit is kg/h.△ λ presets after fuel injection quantity to described second for reducing fuel injection quantity, the excess air coefficient of described automobile catalytic device forward slip value gas stablize after the difference of value and 1 (i.e. stoichiometric proportion).Record t1 value and △ λ according to front oxygen sensor signal, record t2 value according to RO2SV, read MAF, substitute into the oxygen storage capacity OSC that above-mentioned formulae discovery obtains catalyst converter.
Further, after the oxygen storage capacity OSC obtaining catalyst converter, the degradation of described automobile catalytic device can be judged according to the oxygen storage capacity of automobile catalytic device.
According to the oxygen storage capacity detecting method of the automobile catalytic device of the embodiment of the present invention, there is the advantage that the testing precision of the oxygen storage capacity of automobile catalytic device is high.
Fig. 3 is the structured flowchart of the oxygen storage capacity detection system of automobile catalytic device according to an embodiment of the invention, as shown in Figure 3, the oxygen storage capacity detection system 300 of automobile catalytic device according to an embodiment of the invention, comprising: front lambda sensor 310, post oxygen sensor 320 and processor 330.
Wherein, before front lambda sensor 310 is arranged on automobile catalytic device, after post oxygen sensor 320 is arranged on automobile catalytic device.Processor 330 is for after the closed loop control of cut out mixed gas, obtain the excess air coefficient of initial mixing gas, and judge whether the excess air coefficient of initial mixing gas is positioned at preset standard scope, if not, then regulate current fuel injection quantity, excess air coefficient is revised, and when after excess air coefficient correction to preset standard scope, utilizes oxygen storage capacity method of measurement to obtain the oxygen storage capacity of automobile catalytic device further.
In one embodiment of the invention, oxygen storage capacity method of measurement, comprising: increase current fuel injection quantity to the first and preset fuel injection quantity, delay predetermined time is until the magnitude of voltage of described post oxygen sensor rises to first threshold; Reduce current fuel injection quantity to the second and preset fuel injection quantity until the magnitude of voltage of described post oxygen sensor drops to Second Threshold, and to record excess air coefficient be reach the moment of 1 and drop to the moment of predetermined coefficient value, wherein, described Second Threshold is less than described first threshold, and described predetermined coefficient value is less than described 1; Obtain the flow of mixed gas; Be the oxygen storage capacity that the moment reaching 1 and the moment dropping to predetermined coefficient value obtain described automobile catalytic device according to the flow of described mixed gas, described excess air coefficient.
Further, can be obtained the oxygen storage capacity of described automobile catalytic device by following formula, wherein, formula is:
Wherein, described OSC is the oxygen storage capacity of described automobile catalytic device, described t1 to be described excess air coefficient be reach 1 moment, described t2 is the moment that described excess air coefficient drops to predetermined coefficient value, described MAF is the flow of described mixed gas, described △ λ presets after fuel injection quantity to described second for reducing fuel injection quantity, the excess air coefficient of described automobile catalytic device forward slip value gas stablize after value and 1 difference.
In one embodiment of the invention, after the oxygen storage capacity calculating automobile catalytic device, processor 330 is also for judging the degradation of automobile catalytic device according to the oxygen storage capacity of automobile catalytic device.
Owing to closing after mixed gas closed loop control enters opened loop control, engine control system is insufficient to mixed gas self study, the excess air coefficient of initial mixing gas likely exceeds the scope of permission, thus causes the measurement result of the oxygen storage capacity of automobile catalytic device inaccurate.Therefore, the oxygen storage capacity detection system of the automobile catalytic device of the embodiment of the present invention, after the closed loop control of closedown mixed gas enters opened loop control, by judging the excess air coefficient of initial mixing gas and revising, make after the excess air coefficient of initial mixing gas adjusts to the scope of permission, carry out the measurement of the oxygen storage capacity of automobile catalytic device again, thus effectively can improve the measuring accuracy of the oxygen storage capacity of automobile catalytic device.
It should be noted that, the specific implementation of the specific implementation of oxygen storage capacity detection system of the automobile catalytic device of the embodiment of the present invention and the oxygen storage capacity detecting method of the automobile catalytic device of the embodiment of the present invention is similar, specifically referring to the description of method part, in order to reduce redundancy, not repeating.
Embodiments of the invention further disclose a kind of vehicle, comprising: the oxygen storage capacity detection system of the automobile catalytic device according to any one embodiment above-mentioned.This vehicle effectively can improve the measuring accuracy of the oxygen storage capacity of automobile catalytic device.
In addition, according to the vehicle of the embodiment of the present invention other form and effect be all known for the ordinary skill in the art, in order to reduce redundancy, do not repeat herein.
In the description of this specification, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, identical embodiment or example are not necessarily referred to the schematic representation of above-mentioned term.And the specific features of description, structure, material or feature can combine in an appropriate manner in any one or more embodiment or example.
Although illustrate and describe embodiments of the invention, those having ordinary skill in the art will appreciate that: can carry out multiple change, amendment, replacement and modification to these embodiments when not departing from principle of the present invention and aim, scope of the present invention is by claim and equivalency thereof.
Claims (9)
1. an oxygen storage capacity detecting method for automobile catalytic device, is characterized in that, the front and back of described automobile catalytic device are respectively equipped with front lambda sensor and post oxygen sensor, described in comprise the following steps:
After the closed loop control of closedown mixed gas, obtain the excess air coefficient of initial mixing gas;
Judge whether the excess air coefficient of described initial mixing gas is positioned at preset standard scope;
If not, then regulate current fuel injection quantity, described excess air coefficient is revised; And
When after described excess air coefficient correction to described preset standard scope, oxygen storage capacity method of measurement is utilized to obtain the oxygen storage capacity of described automobile catalytic device further.
2. the oxygen storage capacity detecting method of automobile catalytic device according to claim 1, is characterized in that, described oxygen storage capacity method of measurement, comprising:
Increase current fuel injection quantity to the first and preset fuel injection quantity, delay predetermined time is until the magnitude of voltage of described post oxygen sensor rises to first threshold;
Reduce current fuel injection quantity to the second and preset fuel injection quantity until the magnitude of voltage of described post oxygen sensor drops to Second Threshold, and to record excess air coefficient be reach the moment of 1 and drop to the moment of predetermined coefficient value, wherein, described Second Threshold is less than described first threshold, and described predetermined coefficient value is less than described 1;
Obtain the flow of mixed gas;
Be the oxygen storage capacity that the moment reaching 1 and the moment dropping to predetermined coefficient value obtain described automobile catalytic device according to the flow of described mixed gas, described excess air coefficient.
3. the oxygen storage capacity detecting method of automobile catalytic device according to claim 2, is characterized in that, is obtained the oxygen storage capacity of described automobile catalytic device by following formula, and wherein, described formula is:
Wherein, described OSC is the oxygen storage capacity of described automobile catalytic device, described t1 to be described excess air coefficient be reach 1 moment, described t2 is the moment that described excess air coefficient drops to predetermined coefficient value, described MAF is the flow of described mixed gas, described △ λ presets after fuel injection quantity to described second for reducing fuel injection quantity, the excess air coefficient of described automobile catalytic device forward slip value gas stablize after value and 1 difference.
4. the oxygen storage capacity detecting method of the automobile catalytic device according to any one of claim 1-3, is characterized in that, also comprise: the degradation judging described automobile catalytic device according to the oxygen storage capacity of described automobile catalytic device.
5. an oxygen storage capacity detection system for automobile catalytic device, is characterized in that, comprising:
Be arranged on the front lambda sensor before automobile catalytic device and the post oxygen sensor after being arranged on described automobile catalytic device;
Processor, described processor is used for after the closed loop control of cut out mixed gas, obtain the excess air coefficient of initial mixing gas, and judge whether the excess air coefficient of described initial mixing gas is positioned at preset standard scope, if not, then regulate current fuel injection quantity, described excess air coefficient is revised, and when after described excess air coefficient correction to described preset standard scope, utilize oxygen storage capacity method of measurement to obtain the oxygen storage capacity of described automobile catalytic device further.
6. the oxygen storage capacity detection system of automobile catalytic device according to claim 5, is characterized in that, described oxygen storage capacity method of measurement, comprising:
Increase current fuel injection quantity to the first and preset fuel injection quantity, delay predetermined time is until the magnitude of voltage of described post oxygen sensor rises to first threshold;
Reduce current fuel injection quantity to the second and preset fuel injection quantity until the magnitude of voltage of described post oxygen sensor drops to Second Threshold, and to record excess air coefficient be reach the moment of 1 and drop to the moment of predetermined coefficient value, wherein, described Second Threshold is less than described first threshold, and described predetermined coefficient value is less than described 1;
Obtain the flow of mixed gas;
Be the oxygen storage capacity that the moment reaching 1 and the moment dropping to predetermined coefficient value obtain described automobile catalytic device according to the flow of described mixed gas, described excess air coefficient.
7. the oxygen storage capacity detection system of automobile catalytic device according to claim 6, is characterized in that, is obtained the oxygen storage capacity of described automobile catalytic device by following formula, and wherein, described formula is:
Wherein, described OSC is the oxygen storage capacity of described automobile catalytic device, described t1 to be described excess air coefficient be reach 1 moment, described t2 is the moment that described excess air coefficient drops to predetermined coefficient value, described MAF is the flow of described mixed gas, described △ λ presets after fuel injection quantity to described second for reducing fuel injection quantity, the excess air coefficient of described automobile catalytic device forward slip value gas stablize after value and 1 difference.
8. the oxygen storage capacity detection system of the automobile catalytic device according to any one of claim 4-7, is characterized in that, described processor is also for judging the degradation of described automobile catalytic device according to the oxygen storage capacity of described automobile catalytic device.
9. a vehicle, is characterized in that, comprising: the oxygen storage capacity detection system of the automobile catalytic device according to any one of claim 4-8.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109057927A (en) * | 2018-08-01 | 2018-12-21 | 奇瑞汽车股份有限公司 | A kind of calculation method of catalyst converter oxygen storage capacity |
| CN110259553A (en) * | 2019-06-28 | 2019-09-20 | 潍柴动力股份有限公司 | A kind of calculation method, device and the electronic equipment of ternary catalyzing unit oxygen storage capacity |
| CN111691959A (en) * | 2020-06-23 | 2020-09-22 | 东风柳州汽车有限公司 | Method and device for detecting oxygen storage amount of automobile catalyst, storage medium and device |
| CN112196683A (en) * | 2020-09-01 | 2021-01-08 | 东风商用车有限公司 | Method and system for diagnosing reasonability of air flow of diesel engine |
| CN112664342A (en) * | 2020-12-29 | 2021-04-16 | 东风汽车集团有限公司 | Three-way catalyst control method and system |
| CN112983610A (en) * | 2019-12-12 | 2021-06-18 | 北京车和家信息技术有限公司 | Catalyst detection method and hybrid vehicle |
| CN115217659A (en) * | 2022-06-17 | 2022-10-21 | 天津大学 | Gasoline engine fuel injection quantity control method based on three-way catalyst oxygen storage state monitoring result |
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| CN112664342A (en) * | 2020-12-29 | 2021-04-16 | 东风汽车集团有限公司 | Three-way catalyst control method and system |
| CN115217659A (en) * | 2022-06-17 | 2022-10-21 | 天津大学 | Gasoline engine fuel injection quantity control method based on three-way catalyst oxygen storage state monitoring result |
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