CN103790684B - The fault detection method of a kind of oxidation catalyzer and device - Google Patents
The fault detection method of a kind of oxidation catalyzer and device Download PDFInfo
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- CN103790684B CN103790684B CN201410018968.7A CN201410018968A CN103790684B CN 103790684 B CN103790684 B CN 103790684B CN 201410018968 A CN201410018968 A CN 201410018968A CN 103790684 B CN103790684 B CN 103790684B
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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
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- Y02T10/10—Internal combustion engine [ICE] based vehicles
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Abstract
The invention discloses the fault detection method of a kind of oxidation catalyzer, comprising determining that the maximum differential pressure value at the maximum exhaust flow in oxidation catalyzer and oxidation catalyzer two ends, the described maximum differential pressure value determined is at the pressure difference detecting the described oxidation catalyzer two ends detected while described maximum exhaust flow；If the described maximum differential pressure value determined is less than the theoretical pressure difference at described oxidation catalyzer two ends, then determining that described oxidation catalyzer damages or is removed, described theoretical pressure difference is the pressure difference at described oxidation catalyzer two ends in the case of described oxidation catalyzer does not damages or is not removed.The invention also discloses the failure detector of a kind of oxidation catalyzer.
Description
Technical field
The present invention relates to technical field of engines, particularly relate to fault detection method and the device of a kind of oxidation catalyzer.
Background technology
Oxidation catalyzer (diesel oxidation catalyst is called for short DOC), plays the part of in exhaust after-treatment
Extremely important role, it is arranged in engine exhaust system.The installation site of oxidation catalyzer shown in Figure 1 is shown
Being intended to, oxidation catalyzer mainly has following effect.
First effect is: the waste gas that electromotor produces enters in oxidation catalyzer 2 by exhaustor 1, oxidation catalysis
Oxidant in device 2 is the NO(nitric oxide in portion) it is oxidized to NO2(nitrogen dioxide), NO2 can aoxidize
Fall the one that the part soot soot(soot in waste gas is granule, predominantly carbon granule and be wrapped in the Hydrocarbon of outer layer,
Can oxidized burn), reduce grain catcher (Diesel Particulate Fil by reducing the content of soot
Ter, is called for short DPF) frequency of 3 initiative regenerations；Second effect is, containing part soluble oil fraction (Solu in waste gas
Ble Organic Fractions, is called for short SOF), it mainly includes unburned hydrocarbon mixture, oxidation catalyzer
2 can oxidize away SOF, prevent it from entering in grain catcher 3, it is to avoid to cause quick-fried when grain catcher 3 initiative regeneration
Fire and burn out grain catcher 3；3rd effect is, when grain catcher 3 initiative regeneration, to be sent into by fuel nozzle 5
Fuel oil burns in oxidation catalyzer 2, and grain catcher 3 serves the effect of protection, prevents grain catcher 3 from being burnt
Bad；4th effect is, the carbon monoxide CO, hydrocarbon HC etc., it is possible to decrease tail gas in oxidation catalyzer 2 energy oxidation gaseous effluent
In the content of harmful gas.
Visible, oxidation catalyzer plays extremely important role in exhaust after-treatment, if oxidation catalyzer damages
Or be removed, then can accelerate the damage of grain catcher.
Summary of the invention
In view of this, the main purpose of the embodiment of the present invention be to provide the fault detection method of a kind of oxidation catalyzer and
Device, to realize the purpose whether detection oxidation catalyzer damages or whether be removed.
For achieving the above object, embodiments provide the fault detection method of a kind of oxidation catalyzer, including:
Determine the maximum differential pressure value at the maximum exhaust flow in oxidation catalyzer and oxidation catalyzer two ends, described determine
Maximum differential pressure value is in the pressure detecting the described oxidation catalyzer two ends detected while the described maximum exhaust flow determined
Difference；
If the described maximum differential pressure value determined is less than the theoretical pressure difference at described oxidation catalyzer two ends, it is determined that described
Oxidation catalyzer damages or is removed, and described theoretical pressure difference is the situation do not damaged at described oxidation catalyzer or be not removed
Under the pressure difference at described oxidation catalyzer two ends.
Preferably, in the above-mentioned methods, the described maximum exhaust flow determined in oxidation catalyzer and oxidation catalyzer two
The maximum differential pressure value of end, specifically includes:
Judge whether oxidation catalyzer is in stability of flow state and pressure reduction steady statue in setting duration, if it is,
Then recording the maximum exhaust flow in described setting duration and maximum differential pressure value, described stability of flow state is for entering oxidation catalysis
The exhaust gas flow of device sets in numerical range first, and described pressure reduction steady statue is that the pressure reduction at oxidation catalyzer two ends is second
In setting numerical range；
Judge the maximum exhaust flow whether maximum exhaust flow of described record determines more than the last time；
If it is, the maximum exhaust flow that the maximum exhaust flow of described record is defined as in oxidation catalyzer, and
The maximum differential pressure value of described record is defined as the maximum differential pressure value at oxidation catalyzer two ends, continues executing with described judgement oxidation and urge
Change whether device is in stability of flow state and the step of pressure reduction steady statue, until electronic control unit ECU power-off being detected
Till；
Described judge whether oxidation catalyzer is in stability of flow state and pressure reduction steady statue if it is not, then continue executing with
Step, until electronic control unit ECU power-off detected.
Preferably, in the above-mentioned methods, the described maximum exhaust flow determined in oxidation catalyzer and oxidation catalyzer two
After the maximum differential pressure value of end, also include:
If be detected that electronic control unit ECU power-off, then obtain the theoretical pressure at described oxidation catalyzer two ends
Difference.
Preferably, in the above-mentioned methods, the described maximum exhaust flow determined in oxidation catalyzer and oxidation catalyzer two
After the maximum differential pressure value of end, also include:
If be detected that electronic control unit ECU power-off and the maximum exhaust flow that currently determines are more than setting
Threshold value, then obtain the theoretical pressure difference at described oxidation catalyzer two ends.
Preferably, said method also includes:
While the maximum exhaust flow that detection currently determines, detect the temperature value in described oxidation catalyzer；
The theoretical pressure difference at described acquisition described oxidation catalyzer two ends, specifically includes:
Inquiry calibration maps, that has demarcated between exhaust gas flow value, temperature value and pressure difference in described calibration maps in advance is corresponding
Relation；
Obtain corresponding with the maximum exhaust flow currently determined and the described temperature value detected according to described corresponding relation
Theoretical pressure difference.
The embodiment of the present invention additionally provides the failure detector of a kind of oxidation catalyzer, including:
Maximum determines module, for determining that the maximum exhaust flow in oxidation catalyzer and oxidation catalyzer two ends are
Big pressure difference, the described maximum differential pressure value that determines be detect while detecting the described maximum exhaust flow determined described in
The pressure difference at oxidation catalyzer two ends；
When described maximum, fault determination module, for determining that the maximum differential pressure value that module determines is less than described oxidation catalysis
During the theoretical pressure difference at device two ends, determining that described oxidation catalyzer damages or is removed, described theoretical pressure difference is at described oxygen
Change the pressure difference at described oxidation catalyzer two ends in the case of catalyst converter does not damages or is not removed.
Preferably, in said apparatus, described maximum determines module, specifically includes:
First judging unit, is used for judging whether oxidation catalyzer is in stability of flow state and pressure reduction in setting duration
Steady statue, described stability of flow state is that the exhaust gas flow entering oxidation catalyzer sets in numerical range first, described
Pressure reduction steady statue is that the pressure reduction at oxidation catalyzer two ends sets in numerical range second；
When described first judging unit, data record unit, for judging that the oxidation catalyzer obtained is located in setting duration
When stability of flow state and pressure reduction steady statue, record the maximum exhaust flow in described setting duration and maximum differential pressure value；
Second judging unit, for judging that whether the maximum exhaust flow of described data record unit record is more than the last time
The maximum exhaust flow determined；
Maximum determines unit, for judging the maximum exhaust flow of the described record obtained when described second judging unit
During more than the last maximum exhaust flow determined, the maximum exhaust flow of described record is defined as in oxidation catalyzer
Big exhaust gas flow, and the maximum differential pressure value of described record is defined as the maximum differential pressure value at oxidation catalyzer two ends, continue with
Described first judging unit realizes described judging whether oxidation catalyzer is in stability of flow state and the merit of pressure reduction steady statue
Can, until electronic control unit ECU power-off being detected；
Continue detector unit, for judging that the maximum exhaust flow of described record that obtains is not when described second judging unit
During more than the last maximum exhaust flow determined, continue with described first judging unit and realize described judgement oxidation catalyzer
Whether it is in stability of flow state and the function of pressure reduction steady statue, until detecting that electronic control unit ECU power-off is
Only.
Preferably, said apparatus also includes: theoretical value acquisition module；
At described maximum, described theoretical value acquisition module, for determining that module determines the maximum waste gas in oxidation catalyzer
After the maximum differential pressure value at flow and oxidation catalyzer two ends, if be detected that electronic control unit ECU power-off, then
Obtain the theoretical pressure difference at described oxidation catalyzer two ends；Or, for determining that module determines oxidation catalyzer at described maximum
In maximum exhaust flow and oxidation catalyzer two ends maximum differential pressure value after, if be detected that electronic control unit ECU
Power-off and the maximum exhaust flow currently determined are pressed more than setting threshold value, the then theory obtaining described oxidation catalyzer two ends
Difference.
Preferably, said apparatus also includes:
Temperature detecting module, for, while the maximum exhaust flow that detection currently determines, detecting described oxidation catalysis
Temperature value in device；
Described theoretical value acquisition module, specifically includes:
Differential pressure query unit, is used for inquiring about calibration maps, described calibration maps has been demarcated in advance exhaust gas flow value, temperature value with
Corresponding relation between pressure difference；
Differential pressure acquiring unit, for obtaining and the maximum exhaust flow currently determined and described inspection according to described corresponding relation
The theoretical pressure difference that the temperature value that measures is corresponding.
The fault detection method of the oxidation catalyzer that the embodiment of the present invention provides and device, first, determine oxidation catalyzer
In maximum exhaust flow and the maximum differential pressure value at oxidation catalyzer two ends, the described maximum differential pressure value that determines is described in detection
The pressure difference at the described oxidation catalyzer two ends detected while maximum exhaust flow；Because described oxidation catalyzer damage or
Theoretical pressure reduction after being removed, when the pressure reduction at described oxidation catalyzer two ends can not damage than oxidation catalyzer or is not removed
It is worth little, so, if the described maximum differential pressure value determined is less than the theoretical pressure difference at described oxidation catalyzer two ends, then can determine that
Described oxidation catalyzer damages or is removed.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
In having technology to describe, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is the present invention
Some embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to according to
These accompanying drawings obtain other accompanying drawing.
Fig. 1 is the installation site schematic diagram of oxidation catalyzer in prior art；
The schematic flow sheet of the fault detection method of the oxidation catalyzer that Fig. 2 provides for the embodiment of the present invention；
Maximum exhaust flow that Fig. 3 provides for the embodiment of the present invention and the schematic flow sheet of the determination method of maximum differential pressure；
Another schematic flow sheet of the fault detection method of the oxidation catalyzer that Fig. 4 provides for the embodiment of the present invention；
The structural representation of the failure detector of the oxidation catalyzer that Fig. 5 provides for the embodiment of the present invention.
Detailed description of the invention
For making the purpose of the embodiment of the present invention, technical scheme and advantage clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
The a part of embodiment of the present invention rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment obtained under not making creative work premise, broadly falls into the scope of protection of the invention.
See Fig. 2, for the schematic flow sheet of fault detection method of the oxidation catalyzer that the embodiment of the present invention provides, specifically
Including:
Step 201: determine the maximum differential pressure value at the maximum exhaust flow in oxidation catalyzer and oxidation catalyzer two ends, institute
Stating the maximum differential pressure value determined is to detect the described oxidation catalyzer detected while the described maximum exhaust flow determined
The pressure difference at two ends.
In embodiments of the present invention, a preset time period in current driving cycle or current driving cycle can be made
It it is the detection cycle of an oxidation catalyzer DOC.Within this detection cycle, the exhaust gas flow in detection DOC and DOC two ends in real time
Pressure difference, to enter the maximum exhaust flow of DOC in obtaining this detection cycle, obtain with this maximum exhaust flow simultaneously simultaneously
The maximum differential pressure value at the DOC two ends detected.Wherein, exhaust gas flow can utilize flow transducer to detect, and pressure difference can be in order to
Detect with differential pressure pick-up.
Step 201, maximum exhaust flow shown in Figure 3 and the determination side of maximum differential pressure can be realized by the following method
The schematic flow sheet of method, specifically includes:
Step 301: judge whether oxidation catalyzer is in stability of flow state and pressure reduction steady statue in setting duration,
If it is, perform step 302, if it is not, then continue executing with step 301.
Wherein, described stability of flow state to be the exhaust gas flow entering oxidation catalyzer first set in numerical range and
Maintaining described setting duration, described pressure reduction steady statue is that the pressure reduction at oxidation catalyzer two ends sets in numerical range second
And maintain described setting duration.
Assume that current driving cycle is that a DOC detects the cycle, within this detection cycle, in real time in detection DOC
Exhaust gas flow and the pressure reduction at DOC two ends, when the exhaust gas flow in DOC sets in numerical range (such as: DO first
Exhaust gas flow Q in C is more than or equal to flow B and less than or equal to flow A, i.e. A >=Q >=B) and keep setting duration T,
Illustrate that DOC is in stability of flow state, when the pressure reduction at DOC two ends sets in numerical range (such as: DOC second
The pressure reduction F at two ends is more than or equal to pressure reduction D and less than or equal to pressure reduction C, i.e. C >=F >=D) and also maintain setting duration T,
Illustrate that DOC is in pressure reduction steady statue.It should be noted that setting duration T and pressure reduction under stability of flow state are stable
Setting duration under state refers to the same time period.
Step 302: record the maximum exhaust flow in described setting duration and maximum differential pressure value.
In order to avoid the flow caused because of reasons such as disturbances and the larger fluctuation of pressure difference signal, and the maximum obtained is given up
Throughput and maximum differential pressure are not reliable data, in embodiment of the present invention step 302, meet stability of flow at DOC
Under conditions of stable with pressure reduction (i.e. under the Rule of judgment in meeting step 301), detect in re-recording setting duration
Big exhaust gas flow and maximum differential pressure value, so can get a pair and effectively detect data, and then can improve follow-up to DO
The accuracy of the judgement that C damages or removes.
Step 303: judge the maximum exhaust flow whether maximum exhaust flow of described record determines more than the last time；As
Fruit is, then perform step 304；If it is not, then perform step 301, until electronic control unit ECU power-off detected.
Step 304: the maximum exhaust flow that the maximum exhaust flow of described record is defined as in oxidation catalyzer, and
The maximum differential pressure value of described record is defined as the maximum differential pressure value at oxidation catalyzer two ends, continues executing with step 301, until inspection
Till measuring electronic control unit ECU power-off.
In current driving cycle, as long as DOC maintains steady statue in setting duration, (described steady statue is i.e.
For the stability of flow state described in step 301 and pressure reduction steady statue), just record one-time detection data (described detection data
For the maximum exhaust flow described in step 302 and maximum differential pressure value).Specifically, when described steady statue occurs first, will
The detection data of first record are defined as maximum exhaust flow and the maximum differential pressure value of DOC, in the steady statue of follow-up appearance
In, if the maximum exhaust flow that the maximum exhaust flow of trailer record is more than the last DOC determined, just by follow-up note
The maximum exhaust flow of record and maximum differential pressure value are defined as maximum exhaust flow and the maximum differential pressure value of DOC, on replacing
The maximum exhaust flow once determined and maximum differential pressure value.Constantly circulate above-mentioned steps, to determine in current driving cycle
Big exhaust gas flow and maximum differential pressure value, until current driving cycle terminates i.e. to enter Afterrun state (fterrun shape
State, refers to that electronic control unit ECU is from down to the stage the most out of service) terminate afterwards.
Step 202: if the described maximum differential pressure value determined is less than the theoretical pressure difference at described oxidation catalyzer two ends, then
Determining that described oxidation catalyzer damages or is removed, described theoretical pressure difference is not damage at described oxidation catalyzer or do not moved
The pressure difference at described oxidation catalyzer two ends in the case of removing.
Owing to DOC damages or is removed, the pressure reduction at DOC two ends can be caused to diminish, so, when the maximum determining DOC two ends
When pressure difference is less than the DOC theoretical pressure difference under normal operating condition, just can determine that DOC damages or is removed.Need explanation
, when theoretical pressure difference is under DOC is in normal condition, detect while described maximum exhaust flow being detected
The normal pressure difference value at DOC two ends, this theoretical pressure difference can be in the case of DOC does not damages or is not removed, by many
The pressure difference that secondary test obtains in advance.
See Fig. 4, for another schematic flow sheet of fault detection method of the oxidation catalyzer that the embodiment of the present invention provides,
Specifically include:
Step 401: determine the maximum differential pressure value at the maximum exhaust flow in oxidation catalyzer and oxidation catalyzer two ends, institute
Stating the maximum differential pressure value determined is to detect the described oxidation catalyzer detected while the described maximum exhaust flow determined
The pressure difference at two ends.
Step 402: if be detected that electronic control unit ECU power-off, then obtain described oxidation catalyzer two ends
Theoretical pressure difference, described theoretical pressure difference is described oxygen in the case of described oxidation catalyzer does not damages or is not removed
Change the pressure difference at catalyst converter two ends.
In step 402, after electronic control unit ECU power-off being detected, it is also possible to determine whether current
Whether the maximum exhaust flow determined, more than setting threshold value, now, can replace with step 402: if be detected that Electronic Control
Unit ECU power-off and the maximum exhaust flow currently determined are more than setting threshold value, then obtain described oxidation catalyzer two
The theoretical pressure difference of end.
Wherein, increase the step of " judging that whether the maximum exhaust flow currently determined is more than setting threshold value ", its objective is
Ensure that the maximum exhaust flow currently determined is sufficiently large, during because maximum exhaust flow is sufficiently large, corresponding normal pressure difference
(i.e. theoretical pressure difference), also by sufficiently large, if DOC damages or is removed, the maximum differential pressure value the most currently determined must be bright
Aobvious less than theoretical pressure difference, so, increase this and judge that step can significantly improve detection DOC infringement or the accuracy being removed.
In step 402, in order to realize the step of " obtaining the theoretical pressure difference at described oxidation catalyzer two ends ", the present invention
Embodiment also includes: while the maximum exhaust flow that detection currently determines, detect the temperature value in described oxidation catalyzer.
Owing to the temperature in DOC can affect, the pressure reduction at DOC two ends, i.e. temperature are the highest, pressure reduction is the biggest, so available temperature value
(theoretical pressure difference refers to while the maximum exhaust flow that detection currently determines, the DOC detected to carry out revised theory pressure difference
The normal pressure difference value at two ends) so that theoretical pressure difference is more accurate.Specifically, whether damage at detection DOC or whether moved
Except front, (can not damage or be not removed) under DOC normal condition, by experiment, demarcate the waste gas stream in DOC
The relation between this three of temperature in amount, DOC two ends pressure reduction and DOC, to obtain a calibration maps.Based on this, can
The theoretical pressure difference at the described oxidation catalyzer two ends of employing following manner acquisition:
Inquiry calibration maps, that has demarcated between exhaust gas flow value, temperature value and pressure difference in described calibration maps in advance is corresponding
Relation；The reason corresponding with the maximum exhaust flow currently determined and the described temperature value detected is obtained according to described corresponding relation
Opinion pressure difference.
Step 403: if the maximum differential pressure value currently determined is less than described theoretical pressure difference, it is determined that described oxidation catalysis
Device damages or is removed, and utilizes fault diagnosis detecting system to report to the police.
The fault detection method of oxidation catalyzer that the embodiment of the present invention provides, first, determines in oxidation catalyzer
Big exhaust gas flow and the maximum differential pressure value at oxidation catalyzer two ends, the described maximum differential pressure value determined is to give up in the described maximum of detection
The pressure difference at the described oxidation catalyzer two ends detected while throughput；Because described oxidation catalyzer damages or is removed
After, the theoretical pressure difference when pressure reduction at described oxidation catalyzer two ends can not damage than oxidation catalyzer or is not removed is little, institute
With, if the described maximum differential pressure value determined is less than the theoretical pressure difference at described oxidation catalyzer two ends, then can determine that described oxygen
Change catalyst converter damage or be removed.
See Fig. 5, for the structural representation of failure detector of the oxidation catalyzer that the embodiment of the present invention provides, described
Device 500 specifically includes:
Maximum determines module 501, for determining the maximum exhaust flow in oxidation catalyzer and oxidation catalyzer two ends
Maximum differential pressure value, the described maximum differential pressure value that determines is to detect while detecting the described maximum exhaust flow determined
The pressure difference at described oxidation catalyzer two ends；
When described maximum, fault determination module 502, for determining that the maximum differential pressure value that module 501 determines is less than described oxygen
When changing the theoretical pressure difference at catalyst converter two ends, determine that described oxidation catalyzer damages or is removed, described theoretical pressure difference be
Described oxidation catalyzer is the pressure difference at described oxidation catalyzer two ends in the case of not damaging or not being removed.
Wherein, described maximum determines module 501, specifically includes:
First judging unit, is used for judging whether oxidation catalyzer is in stability of flow state and pressure reduction in setting duration
Steady statue, described stability of flow state is that the exhaust gas flow entering oxidation catalyzer sets in numerical range first, described
Pressure reduction steady statue is that the pressure reduction at oxidation catalyzer two ends sets in numerical range second；
When described first judging unit, data record unit, for judging that the oxidation catalyzer obtained is located in setting duration
When stability of flow state and pressure reduction steady statue, record the maximum exhaust flow in described setting duration and maximum differential pressure value；
Second judging unit, for judging that whether the maximum exhaust flow of described data record unit record is more than the last time
The maximum exhaust flow determined；
Maximum determines unit, for judging the maximum exhaust flow of the described record obtained when described second judging unit
During more than the last maximum exhaust flow determined, the maximum exhaust flow of described record is defined as in oxidation catalyzer
Big exhaust gas flow, and the maximum differential pressure value of described record is defined as the maximum differential pressure value at oxidation catalyzer two ends, continue with
Described first judging unit realizes described judging whether oxidation catalyzer is in stability of flow state and the merit of pressure reduction steady statue
Can, until electronic control unit ECU power-off being detected；
Continue detector unit, for judging that the maximum exhaust flow of described record that obtains is not when described second judging unit
During more than the last maximum exhaust flow determined, continue with described first judging unit and realize described judgement oxidation catalysis
Whether device is in stability of flow state and the function of pressure reduction steady statue, until detecting that electronic control unit ECU power-off is
Only.
Further, described device 500 also includes: theoretical value acquisition module；
At described maximum, described theoretical value acquisition module, for determining that module 501 determines in oxidation catalyzer
After the maximum differential pressure value at big exhaust gas flow and oxidation catalyzer two ends, if be detected that electronic control unit ECU has broken
Electricity, then obtain the theoretical pressure difference at described oxidation catalyzer two ends；Or, for determining that module 501 determines at described maximum
After maximum exhaust flow in oxidation catalyzer and the maximum differential pressure value at oxidation catalyzer two ends, if be detected that Electronic Control
Unit ECU power-off and the maximum exhaust flow currently determined are more than setting threshold value, then obtain described oxidation catalyzer two
The theoretical pressure difference of end.
Further, described device 500 also includes:
Temperature detecting module, for, while the maximum exhaust flow that detection currently determines, detecting described oxidation catalysis
Temperature value in device；
Wherein, described theoretical value acquisition module, specifically include:
Differential pressure query unit, is used for inquiring about calibration maps, described calibration maps has been demarcated in advance exhaust gas flow value, temperature value with
Corresponding relation between pressure difference；
Differential pressure acquiring unit, for obtaining and the maximum exhaust flow currently determined and described inspection according to described corresponding relation
The theoretical pressure difference that the temperature value that measures is corresponding.
The failure detector of oxidation catalyzer that the embodiment of the present invention provides, first, determines in oxidation catalyzer
Big exhaust gas flow and the maximum differential pressure value at oxidation catalyzer two ends, the described maximum differential pressure value determined is to give up in the described maximum of detection
The pressure difference at the described oxidation catalyzer two ends detected while throughput；Because described oxidation catalyzer damages or is removed
After, the theoretical pressure difference when pressure reduction at described oxidation catalyzer two ends can not damage than oxidation catalyzer or is not removed is little, institute
With, if the described maximum differential pressure value determined is less than the theoretical pressure difference at described oxidation catalyzer two ends, then can determine that described oxygen
Change catalyst converter damage or be removed.
As seen through the above description of the embodiments, those skilled in the art is it can be understood that arrive above-mentioned enforcement
All or part of step in example method can add the mode of required general hardware platform by software and realize.Based on such
Understanding, the part that prior art is contributed by technical scheme the most in other words can be with the form of software product
Embodying, this computer software product can be stored in storage medium, such as ROM/RAM, magnetic disc, CD etc., bag
Include some instructions with so that computer equipment (can be personal computer, server, or such as WMG etc.
Network communication equipment, etc.) perform each embodiment of the present invention or the method described in some part of embodiment.
It should be noted that each embodiment uses the mode gone forward one by one to describe in this specification, each embodiment emphasis is said
Bright is all the difference with other embodiments, and between each embodiment, identical similar portion sees mutually.For reality
For executing device disclosed in example, owing to it corresponds to the method disclosed in Example, so describe is fairly simple, relevant part
The method part of seeing illustrates.
Also, it should be noted in this article, the relational terms of such as first and second or the like is used merely to one
Entity or operation separate with another entity or operating space, and not necessarily require or imply between these entities or operation
There is relation or the order of any this reality.And, term " includes ", " comprising " or its any other variant are intended to contain
Comprising of lid nonexcludability, so that include that the process of a series of key element, method, article or equipment not only include that those are wanted
Element, but also include other key elements being not expressly set out, or also include for this process, method, article or equipment
Intrinsic key element.In the case of there is no more restriction, statement " including ... " key element limited, it is not excluded that
Including process, method, article or the equipment of described key element there is also other identical element.
Described above to the disclosed embodiments, makes professional and technical personnel in the field be capable of or uses the present invention.
Multiple amendment to these embodiments will be apparent from for those skilled in the art, as defined herein
General Principle can realize without departing from the spirit or scope of the present invention in other embodiments.Therefore, the present invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and principles disclosed herein and features of novelty phase one
The widest scope caused.
Claims (7)
1. the fault detection method of an oxidation catalyzer, it is characterised in that including:
Determine the maximum differential pressure value at the maximum exhaust flow in oxidation catalyzer and oxidation catalyzer two ends, the described maximum determined
Pressure difference is at the pressure difference detecting the described oxidation catalyzer two ends detected while the described maximum exhaust flow determined；
If the described maximum differential pressure value determined is less than the theoretical pressure difference at described oxidation catalyzer two ends, it is determined that described oxidation
Catalyst converter damages or is removed, and described theoretical pressure difference is institute in the case of described oxidation catalyzer does not damages or is not removed
State the pressure difference at oxidation catalyzer two ends；
Wherein, the described maximum exhaust flow determined in oxidation catalyzer and the maximum differential pressure value at oxidation catalyzer two ends, specifically
Including:
Judge whether oxidation catalyzer is in stability of flow state and pressure reduction steady statue in setting duration, if it is, note
Recording the maximum exhaust flow in described setting duration and maximum differential pressure value, described stability of flow state is to enter oxidation catalyzer
Exhaust gas flow sets in numerical range first, and described pressure reduction steady statue is that the pressure reduction at oxidation catalyzer two ends sets second
In numerical range；
Judge the maximum exhaust flow whether maximum exhaust flow of described record determines more than the last time；
If it is, the maximum exhaust flow that the maximum exhaust flow of described record is defined as in oxidation catalyzer, and by institute
The maximum differential pressure value stating record is defined as the maximum differential pressure value at oxidation catalyzer two ends, continues executing with described judgement oxidation catalyzer
Whether it is in stability of flow state and the step of pressure reduction steady statue, until electronic control unit ECU power-off being detected；
Described judge whether oxidation catalyzer is in stability of flow state and the step of pressure reduction steady statue if it is not, then continue executing with
Suddenly, until electronic control unit ECU power-off being detected.
Method the most according to claim 1, it is characterised in that the described maximum exhaust flow determined in oxidation catalyzer and
After the maximum differential pressure value at oxidation catalyzer two ends, also include:
If be detected that electronic control unit ECU power-off, then obtain the theoretical pressure difference at described oxidation catalyzer two ends.
Method the most according to claim 1, it is characterised in that the described maximum exhaust flow determined in oxidation catalyzer and
After the maximum differential pressure value at oxidation catalyzer two ends, also include:
If be detected that electronic control unit ECU power-off and the maximum exhaust flow that currently determines are more than setting threshold value, then
Obtain the theoretical pressure difference at described oxidation catalyzer two ends.
The most according to the method in claim 2 or 3, it is characterised in that described method also includes:
While the maximum exhaust flow that detection currently determines, detect the temperature value in described oxidation catalyzer；
The theoretical pressure difference at described acquisition described oxidation catalyzer two ends, specifically includes:
Inquiry calibration maps, has demarcated the corresponding relation between exhaust gas flow value, temperature value and pressure difference in advance in described calibration maps；
The reason corresponding with the maximum exhaust flow currently determined and the described temperature value detected is obtained according to described corresponding relation
Opinion pressure difference.
5. the failure detector of an oxidation catalyzer, it is characterised in that including:
Maximum determines module, for determining the maximum pressure of the maximum exhaust flow in oxidation catalyzer and oxidation catalyzer two ends
Difference, the described maximum differential pressure value determined is to detect the described oxidation detected while the described maximum exhaust flow determined
The pressure difference at catalyst converter two ends；
When described maximum, fault determination module, for determining that the maximum differential pressure value that module determines is less than described oxidation catalyzer two
During the theoretical pressure difference held, determining that described oxidation catalyzer damages or is removed, described theoretical pressure difference is to urge in described oxidation
Change the pressure difference at described oxidation catalyzer two ends in the case of device does not damages or is not removed；
Wherein, described maximum determines module, specifically includes:
First judging unit, is used for judging whether oxidation catalyzer is in stability of flow state in setting duration and pressure reduction is stable
State, described stability of flow state is that the exhaust gas flow entering oxidation catalyzer sets in numerical range first, described pressure reduction
Steady statue is that the pressure reduction at oxidation catalyzer two ends sets in numerical range second；
When described first judging unit, data record unit, for judging that the oxidation catalyzer obtained is in stream in setting duration
When amount steady statue and pressure reduction steady statue, record the maximum exhaust flow in described setting duration and maximum differential pressure value；
Second judging unit, for judging whether the maximum exhaust flow of described data record unit record determines more than the last time
Maximum exhaust flow；
Maximum determines unit, for judging that the maximum exhaust flow of the described record obtained is more than when described second judging unit
During the maximum exhaust flow that the last time determines, the maximum that the maximum exhaust flow of described record is defined as in oxidation catalyzer is given up
Throughput, and the maximum differential pressure value of described record is defined as the maximum differential pressure value at oxidation catalyzer two ends, continue with described
First judging unit realizes described judging whether oxidation catalyzer is in stability of flow state and the function of pressure reduction steady statue, directly
To electronic control unit ECU power-off being detected；
Continue detector unit, for judging that when described second judging unit the maximum exhaust flow of the described record obtained is not more than
During the maximum exhaust flow that the last time determines, continue with described first judging unit realizes described whether judging oxidation catalyzer
It is in stability of flow state and the function of pressure reduction steady statue, until electronic control unit ECU power-off being detected.
Device the most according to claim 5, it is characterised in that described device also includes: theoretical value acquisition module；
At described maximum, described theoretical value acquisition module, for determining that module determines the maximum exhaust flow in oxidation catalyzer
After the maximum differential pressure value at oxidation catalyzer two ends, if be detected that electronic control unit ECU power-off, then obtain described
The theoretical pressure difference at oxidation catalyzer two ends；Or, for determining that module determines the maximum in oxidation catalyzer at described maximum
After the maximum differential pressure value at exhaust gas flow and oxidation catalyzer two ends, if be detected that electronic control unit ECU power-off and
The maximum exhaust flow currently determined more than setting threshold value, then obtains the theoretical pressure difference at described oxidation catalyzer two ends.
Device the most according to claim 6, it is characterised in that described device also includes:
Temperature detecting module, for, while the maximum exhaust flow that detection currently determines, detecting in described oxidation catalyzer
Temperature value；
Described theoretical value acquisition module, specifically includes:
Differential pressure query unit, is used for inquiring about calibration maps, has demarcated exhaust gas flow value, temperature value and pressure reduction in described calibration maps in advance
Corresponding relation between value；
Differential pressure acquiring unit, for obtaining and the maximum exhaust flow currently determined and described detect according to described corresponding relation
Theoretical pressure difference corresponding to temperature value.
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| CN110552771B (en) * | 2019-09-19 | 2021-10-08 | 潍柴动力股份有限公司 | Oxidation catalyst fault detection method, device, equipment and storage medium |
| CN112211705B (en) * | 2020-09-10 | 2021-10-08 | 潍柴动力股份有限公司 | Method, device and system for monitoring DPF removal |
| CN112627955A (en) * | 2020-12-10 | 2021-04-09 | 潍柴动力股份有限公司 | SCR catalyst removal diagnosis method, device, equipment and storage medium |
| CN114087057B (en) * | 2022-01-10 | 2022-04-12 | 潍柴动力股份有限公司 | double-DPF removal monitoring method and device and engine |
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| CN101400876A (en) * | 2006-03-17 | 2009-04-01 | 丰田自动车株式会社 | Exhaust purification device of internal combustion engine, and control method thereof |
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| JP4424040B2 (en) * | 2004-04-05 | 2010-03-03 | 株式会社デンソー | Exhaust gas purification device for internal combustion engine |
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| JP5258319B2 (en) * | 2008-02-15 | 2013-08-07 | ボッシュ株式会社 | Failure diagnosis device for oxidation catalyst, failure diagnosis method for oxidation catalyst, and exhaust purification device for internal combustion engine |
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| US4492079A (en) * | 1981-03-30 | 1985-01-08 | Nippon Soken, Inc. | Method and apparatus for detecting degree of clogging in particle trapping member of internal combustion engine |
| CN101400876A (en) * | 2006-03-17 | 2009-04-01 | 丰田自动车株式会社 | Exhaust purification device of internal combustion engine, and control method thereof |
| CN102338137A (en) * | 2011-08-25 | 2012-02-01 | 中联重科股份有限公司 | Method for detecting hydraulic valve, controller and device, method for detecting malfunction of hydraulic loop and device and malfunction processing system |
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