CN110284947A - A kind of three-way catalytic converter aging detection method and device - Google Patents
A kind of three-way catalytic converter aging detection method and device Download PDFInfo
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- CN110284947A CN110284947A CN201910577957.5A CN201910577957A CN110284947A CN 110284947 A CN110284947 A CN 110284947A CN 201910577957 A CN201910577957 A CN 201910577957A CN 110284947 A CN110284947 A CN 110284947A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
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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
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/101—Three-way catalysts
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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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
- Y02T10/12—Improving ICE efficiencies
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
Three-way catalytic converter aging detection method and device provided by the invention, applied to technical field of engines, this method is after engine exits towing astern operating condition, obtain the default parameter for influencing ternary catalyzing unit bed temperature, if gained is preset parameter and is in preset range, the oxygen storage amount of ternary catalyzing unit is calculated, further compares the size relation of gained oxygen storage amount and default oxygen storage capacity threshold value, if the oxygen storage amount being calculated is lower than default oxygen storage capacity threshold value, three-way catalytic converter aging is determined.Three-way catalytic converter aging detection method and device provided by the invention, obtain the oxygen storage amount under ternary catalyzing unit normal operating conditions, and ageing management is carried out by judgment basis of the oxygen storage amount, entire detection process can be completed in the case where not influencing ternary catalyzing unit actual working state, and then avoid influencing the disposed of in its entirety effect of Vehicular exhaust.
Description
Technical field
The invention belongs to technical field of engines more particularly to a kind of three-way catalytic converter aging detection method and device.
Background technique
The pernicious gases such as CO, HC and NOx that vehicle exhaust can be discharged for ternary catalyzing unit (Three-Way-Catalyst)
It is changed into harmless carbon dioxide, water and nitrogen by oxidation and reduction, is mounted in most important in automobile exhaust system
Outer purifier, if ternary catalyzing unit occur aging, will seriously affect the treatment effect of vehicle exhaust, cause vehicle without
Method meets increasingly strict emission regulation demands.
In view of the important function of ternary catalyzing unit in practical applications, how the ageing state of ternary catalyzing unit is examined
It surveys, to replace the ternary catalyzing unit of aging in time, becomes those skilled in the art's technical problem urgently to be resolved.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of three-way catalytic converter aging detection method and device, to ternary
Whether aging is detected catalyst converter, facilitates the ternary catalyzing unit that driver replaces aging in time, it is ensured that at the tail gas of vehicle
Effect is managed, concrete scheme is as follows:
In a first aspect, the present invention provides a kind of three-way catalytic converter aging detection method, it is applied to Vehicle Controller, the side
Method includes:
After engine exits towing astern operating condition, the default parameter for influencing ternary catalyzing unit bed temperature is obtained；
If the default parameter meets preset condition, the oxygen storage amount of the ternary catalyzing unit is calculated；
If the oxygen storage amount is lower than default oxygen storage capacity threshold value, the three-way catalytic converter aging is determined.
Optionally, the oxygen storage amount for calculating the ternary catalyzing unit, comprising:
It determines at the time of the engine exits towing astern operating condition as oxygen consumption initial time；
It is oxygen consumption end time at the time of the oxygen for determining that the ternary catalyzing unit is stored is exhausted；
The oxygen consumption initial time and the oxygen consumption end time are substituted into following formula, the three-element catalytic is calculated
The oxygen storage amount of device:
Wherein, m indicates the oxygen storage amount of the ternary catalyzing unit, mg；
t1Indicate the oxygen consumption initial time, s；
t2Indicate the oxygen consumption end time, s；
Lambda indicates excess air coefficient；
N indicates the exhaust gas mass flow, mg/s；
P indicates the mass fraction of oxygen duty gas, %.
Optionally, lambda sensor is arranged in the ternary catalyzing unit outlet end, and the determination ternary catalyzing unit is stored
Oxygen be oxygen consumption end time at the time of be exhausted, comprising:
Monitor the voltage value of the lambda sensor；
Determine at the time of correspondence when the voltage value of the lambda sensor is greater than predetermined voltage threshold to be the ternary catalyzing unit
The oxygen consumption end time that the oxygen stored is exhausted.
Optionally, the three-way catalytic converter aging detection method that first aspect present invention provides, further includes:
After the engine exits towing astern operating condition, the lambda < 1 is maintained.
Optionally, described after the engine exits towing astern operating condition if the default parameter meets preset condition, it maintains
The lambda < 1, comprising:
Towing astern operating condition is exited from the engine, until described in maintaining in duration corresponding to the oxygen consumption end time
Lambda < 1.
Optionally, described after the engine exits towing astern operating condition if the default parameter is unsatisfactory for preset condition, dimension
Hold the lambda < 1, comprising:
Towing astern operating condition is exited from the engine, until the oxygen consumption of the ternary catalyzing unit reaches with reference to oxygen storage capacity
In duration corresponding to preset ratio, the lambda < 1 is maintained.
Optionally, if the default parameter includes engine coolant temperature, the preset condition includes the engine
Coolant temperature is within the scope of default coolant temperature；
If the default parameter includes Engine Inlet Temperature, the preset condition includes at the Engine Inlet Temperature
In within the scope of default intake air temperature；
If the default parameter includes the ternary catalyzing unit temperature, the preset condition includes the ternary catalyzing unit temperature
Degree is within the scope of default catalyst temperature；
If the default parameter includes engine speed, the preset condition includes that the engine speed is in default turn
In fast range；
If the default parameter includes the storage oxygen duration that engine is in towing astern operating condition, the preset condition includes the storage
Oxygen duration is within the scope of default storage oxygen duration；
If the default parameter includes the air mass that engine is in towing astern operating condition, the preset condition include it is described into
Makings amount is within the scope of default air mass.
Optionally, the method for the air mass is calculated, comprising:
The storage oxygen initial time that the engine enters towing astern operating condition is obtained, and, the engine, which exits, holds in the palm operating condition
Storage oxygen end time；
It calculates in duration corresponding to the storage oxygen initial time to the storage oxygen end time, flows through the engine
The integrated value of exhaust flow obtains the air mass that the engine is in towing astern operating condition.
Optionally, when electric under the Vehicle Controller, the oxygen storage amount is stored.
Second aspect, the present invention provide a kind of three-way catalytic converter aging detection device, comprising:
Acquiring unit, for obtaining the default parameter for influencing ternary catalyzing unit bed temperature after engine exits towing astern operating condition；
Computing unit calculates the oxygen storage of the ternary catalyzing unit if meeting preset condition for the default parameter
Amount；
Judging unit determines that the ternary catalyzing unit is old if being lower than default oxygen storage capacity threshold value for the oxygen storage amount
Change.
Based on the three-way catalytic converter aging detection method and device that aforementioned present invention provides, towing astern operating condition is exited in engine
Afterwards, the default parameter for influencing ternary catalyzing unit bed temperature is obtained, if gained is preset parameter and is in preset range, calculates three-element catalytic
The oxygen storage amount of device further compares the size relation of gained oxygen storage amount and default oxygen storage capacity threshold value, if calculated
The oxygen storage amount arrived is lower than default oxygen storage capacity threshold value, then determines three-way catalytic converter aging.Ternary catalyzing unit provided by the invention
Degradation detecting method and device obtain the oxygen storage amount under ternary catalyzing unit normal operating conditions, and with the oxygen storage amount
Ageing management is carried out for judgment basis, entire detection process can be in the case where not influencing ternary catalyzing unit actual working state
It completes, and then avoids influencing the disposed of in its entirety effect of Vehicular exhaust.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is the present invention
Some embodiments for those of ordinary skill in the art without creative efforts, can also basis
These attached drawings obtain other attached drawings.
Fig. 1 is a kind of flow chart for three-way catalytic converter aging detection method that the present patent application embodiment provides；
Fig. 2 is a kind of structural block diagram for three-way catalytic converter aging detection device that the present patent application embodiment provides.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
When engine enters towing astern operating condition, engine stop oil spout/jet, engine charge is pure air, correspondingly,
The exhaust gas for flowing through ternary catalyzing unit is diluter (predominantly air), and ternary catalyzing unit is in the state of storage oxygen；It is moved back in engine
Out when towing astern operating condition, engine charge reverts to the gaseous mixture of oil and gas and air, and engine enters normal operating conditions,
Correspondingly, ternary catalyzing unit is in the state of consumption oxygen, condition premised on storing up full oxygen when engine is in towing astern operating condition, i.e.,
The practical oxygen storage amount of ternary catalyzing unit can be calculated.
Based on above-mentioned premise, the present patent application embodiment provides a kind of three-way catalytic converter aging detection method, referring to Fig. 1,
Fig. 1 is the flow chart of three-way catalytic converter aging detection method provided in an embodiment of the present invention, and this method can be applied to vehicle setting
The controller of entire car controller or car running computer etc. with data-handling capacity；Referring to Fig.1, provided in an embodiment of the present invention three
First catalyst converter degradation detecting method may include:
Step S100, after engine exits towing astern operating condition, the default parameter for influencing ternary catalyzing unit bed temperature is obtained.
The oxygen storage capacity of ternary catalyzing unit is affected by bed temperature and catalyst converter aging action, therefore, is urged to ternary
Change device when whether aging is detected, the bed temperature of ternary catalyzing unit should be limited in a certain range, avoid bed temperature factor to inspection
Result is surveyed to interfere.
After engine exits towing astern operating condition, the default parameter for influencing ternary catalyzing unit bed temperature is obtained.Under normal circumstances, three
The bed temperature of first catalyst converter is mainly turned by engine coolant temperature, Engine Inlet Temperature, ternary catalyzing unit temperature, engine
Speed, engine are in the air mass of towing astern operating condition, engine is in the influence of the factors such as the storage oxygen duration of towing astern operating condition, therefore,
Before carrying out subsequent decision process, it can according to need one or more be used as chosen in above-mentioned default parameter and judge ternary
The standard of catalyst converter bed temperature.
It is contemplated that correct, effective acquisition in order to guarantee above-mentioned each default parameter, it is also necessary to which detection is to inductive sensing
Device, such as temperature sensor, if break down, in the case where respective sensor works normally, obtain corresponding default ginseng
Amount.Certainly, any parameter that can be used for judging ternary catalyzing unit bed temperature is all optional, without departing from core concept of the present invention
Under the premise of range, the range of the present patent application protection is equally belonged to.
Step S110, judge whether default parameter meets preset condition, if so, executing step S120.
The foregoing default parameter for influencing ternary catalyzing unit bed temperature, if default parameter includes engine coolant temperature
Degree, preset condition includes that engine coolant temperature is within the scope of default coolant temperature, if default parameter includes engine
Intake air temperature, preset condition includes that Engine Inlet Temperature is within the scope of default intake air temperature, if default parameter includes ternary
Catalyst temperature, preset condition includes that ternary catalyzing unit temperature is within the scope of default catalyst temperature, if default parameter includes
Engine speed, preset condition includes that engine speed is within the scope of preset rotation speed, if default parameter includes that engine is in
The storage oxygen duration of towing astern operating condition, preset condition includes that storage oxygen duration is within the scope of default storage oxygen duration, if default parameter includes
Engine is in the air mass of towing astern operating condition, and preset condition includes that air mass is within the scope of default air mass.
Judgement range corresponding to above-mentioned each default parameter, can according to the characteristic of ternary catalyzing unit, and, rack examination
The test result tested is formulated, and details are not described herein again.
Optionally, the calculating of the storage oxygen duration of towing astern operating condition is in for engine, it is first determined engine enters towing astern
At the time of corresponding when operating condition, at the time of then further determining that engine exits towing astern operating condition, then engine enters towing astern work
Duration between at the time of exiting corresponding to towing astern operating condition at the time of corresponding to condition to engine, as engine are in towing astern work
The storage oxygen duration of condition.
The calculating of the air mass of towing astern operating condition is in for engine, likewise, firstly the need of engine entrance is determined
The storage oxygen initial time of towing astern operating condition, and, engine exits down the storage oxygen end time of support operating condition, then calculates storage oxygen starting
In duration corresponding to moment to storage oxygen end time, the integrated value of the exhaust flow of engine is flowed through, engine is obtained and is in
The air mass of towing astern operating condition.
It should be noted that it is of the present invention and engine enter towing astern operating condition and exit the judgement of towing astern operating condition,
It can be realized using determination method in the prior art, the present patent application does not limit this.
If the default parameter obtained meets corresponding preset condition, S120 is thened follow the steps, ternary catalyzing unit is calculated
Oxygen storage amount, correspondingly, exiting this detection process if the default parameter obtained is unsatisfactory for corresponding preset condition.
Step S120, the oxygen storage amount of ternary catalyzing unit is calculated.
Ternary catalyzing unit stores oxygen in engine towing astern operating condition, and oxygen will be consumed after exiting, and is urged by calculating ternary
Change oxygen emission of the device after engine exits towing astern operating condition, the oxygen storage amount of ternary catalyzing unit can be obtained.
Optionally, it as oxygen consumption initial time t1 at the time of exiting towing astern operating condition using engine, is stored with ternary catalyzing unit
Oxygen be oxygen consumption end time t2 at the time of be exhausted, oxygen consumption initial time t1 is calculated to oxygen consumption using following formula (1)
The oxygen storage amount of ternary catalyzing unit in the corresponding duration of end time t2.
Wherein, m indicates the oxygen storage amount of the ternary catalyzing unit, mg；
t1Indicate the oxygen consumption initial time, s；
t2Indicate the oxygen consumption end time, s；
Lambda indicates excess air coefficient；
N indicates the exhaust gas mass flow, mg/s；
P indicates the mass fraction of oxygen duty gas, %.
Optionally, lambda sensor is set in the output end of ternary catalyzing unit, specifically, narrow lambda sensor can be selected
(switching mode lambda sensor), acquires the voltage change of lambda sensor, and then judges the dense dilute variation of ternary catalyzing unit output end tail gas.
Specifically, the voltage value of lambda sensor is detected after engine exits towing astern operating condition, if monitoring the voltage value of lambda sensor
Greater than predetermined voltage threshold, it is determined that the voltage value of lambda sensor is urged at the time of corresponding when being greater than predetermined voltage threshold for ternary
Change the oxygen consumption end time that the oxygen that device is stored is exhausted.
Optionally, it is contemplated that be delayed, sending out between the intrinsic response time and progress oxygen storage amount calculating of lambda sensor
After motivation exits towing astern operating condition, the calculating that preset duration carries out oxygen storage amount again later can be postponed, to improve calculated result
Accuracy.
Step S130, judge whether oxygen storage amount is lower than default oxygen storage capacity threshold value, if so, step S140 is executed, if it is not,
Execute step S150.
It is calculated after the oxygen storage amount of ternary catalyzing unit, oxygen storage amount and default storage oxygen threshold value can be carried out
Comparison determines that aging occurs for ternary catalyzing unit if oxygen storage amount is lower than default oxygen storage capacity threshold value, on the contrary, if oxygen
Gas amount of storage is not less than default oxygen storage capacity threshold value, then determines that aging does not occur for ternary catalyzing unit generation.
Step S140 determines three-way catalytic converter aging.
Oxygen storage amount is lower than default oxygen storage capacity threshold value, determines that aging occurs for ternary catalyzing unit.
Optionally, after determining three-way catalytic converter aging, corresponding prompting message can be sent to driver, driven with reminding
The person of sailing replaces ternary catalyzing unit in time.
Step S150 determines that ternary catalyzing unit is unaged.
Oxygen storage amount is not less than default oxygen storage capacity threshold value, determines that aging does not occur for ternary catalyzing unit.
Optionally, it in the not aged situation of ternary catalyzing unit, can be exported without any information, ternary catalyzing unit is just
It is often used, it is of course also possible to export corresponding testing result to driver, informs driver by this detection, ternary
Catalyst converter is still within normal operating conditions.
In conclusion three-way catalytic converter aging detection method and device provided by the invention, it is normal to obtain ternary catalyzing unit
Oxygen storage amount under working condition, and ageing management is carried out by judgment basis of the oxygen storage amount, entire detection process can
To complete in the case where not influencing ternary catalyzing unit actual working state, and then avoid influencing the disposed of in its entirety effect of Vehicular exhaust
Fruit.
Optionally, it is the accuracy for further increasing testing result, in a driving cycle, generates final detection knot
Before fruit, the detection method that can be provided using aforementioned embodiment illustrated in fig. 1 or aforementioned embodiment illustrated in fig. 2, to three-element catalytic
Device carries out the calculating of multiple oxygen storage amount, and the multiple oxygen storage amounts of gained are weighted, and will finally obtain oxygen and deposits
Reserves as judge ternary catalyzing unit whether the judgment basis of aging.
Optionally, it can select following formula (2) that multiple oxygen storage amounts are weighted.
Out=m* (InValue-OldValue)+OldValue (2)
Wherein, out indicates the weighted calculation value of current oxygen storage amount；
InValue indicates the calculated value for the current oxygen storage amount being calculated using aforementioned integral formula；
OldValue indicates that last oxygen storage amount obtains oxygen storage amount weighted value in calculating；
M is weighted factor, i.e. InValue accounts for the weight of OldValue.
Optionally, it is contemplated that when engine is in towing astern operating condition, ternary catalyzing unit is in storage oxygen state for a long time,
After engine exits towing astern operating condition, if do not intervened the course of work of ternary catalyzing unit, Vehicular exhaust processing will be imitated
Fruit causes to seriously affect, and therefore, the embodiment of the present invention also provides a kind of method, after engine exits towing astern operating condition, thickens three
The air inlet of first catalyst converter maintains aforementioned 1 a period of time of excess air coefficient lambda <, ternary catalyzing unit is accelerated to store oxygen
Consumption, while improving the vent gas treatment effect of ternary catalyzing unit.
Specifically, towing astern operating condition is exited from engine if aforementioned default parameter meets preset condition, until when oxygen consumption terminates
It carves and maintains lambda < 1 in corresponding duration.If immediately beginning to ternary catalyzing unit oxygen when engine exits towing astern operating condition
The calculating of gas amount of storage, then entirely calculating ternary catalyzing unit in the case where aforementioned default parameter meets preset condition
During oxygen storage amount, all maintenance lambda < 1.
If aforementioned default parameter is unsatisfactory for preset condition, towing astern operating condition is exited from engine, until the oxygen of ternary catalyzing unit
Gas consumption reaches in the duration with reference to corresponding to the preset ratio of oxygen storage capacity, maintains the lambda < 1.
It should be noted that for ternary catalyzing unit in the case where aforementioned default parameter is unsatisfactory for preset condition, oxygen
The calculating of consumption can realize that it is not limited in the embodiment of the present invention using calculation in the prior art.
Explanation is needed further exist for, resulting ternary is calculated when can select last towing astern operating condition with reference to oxygen storage capacity and is urged
The oxygen storage amount for changing device can also equally be selected and calculate gained oxygen storage capacity weighted calculation value using above-mentioned formula (2).To realize
This purpose when electric under Vehicle Controller, be required to storage and calculate resulting oxygen storage amount.Oxygen storage amount is added
What power calculated, it can also save and calculate resulting oxygen storage capacity weighted calculation value.Further, for first experience towing astern operating condition
It, can be with preset calibration value with reference to oxygen storage capacity for unit catalyst converter.
Three-way catalytic converter aging detection device provided in an embodiment of the present invention is introduced below, ternary described below
Catalyst converter degradation detecting device may be considered the three-way catalytic converter aging detection method that embodiment provides to realize the present invention,
The functional module framework of setting is needed in central equipment；Be described below content can with above it is cross-referenced.
Fig. 2 is a kind of structural block diagram for three-way catalytic converter aging detection device that the present patent application embodiment provides, reference
Fig. 2, the apparatus may include:
Acquiring unit 10, for obtaining the default ginseng for influencing ternary catalyzing unit bed temperature after engine exits towing astern operating condition
Amount；
Computing unit 20, if meeting preset condition for the default parameter, the oxygen for calculating the ternary catalyzing unit is deposited
Reserves；
Judging unit 30 determines the ternary catalyzing unit if being lower than default oxygen storage capacity threshold value for the oxygen storage amount
Aging.
Professional further appreciates that, unit described in conjunction with the examples disclosed in the embodiments of the present disclosure
And algorithm steps, can be realized with electronic hardware, computer software, or a combination of the two, in order to clearly demonstrate hardware and
The interchangeability of software generally describes each exemplary composition and step according to function in the above description.These
Function is implemented in hardware or software actually, the specific application and design constraint depending on technical solution.Profession
Technical staff can use different methods to achieve the described function each specific application, but this realization is not answered
Think beyond the scope of this invention.
The step of method described in conjunction with the examples disclosed in this document or algorithm, can directly be held with hardware, processor
The combination of capable software module or the two is implemented.Software module can be placed in random access memory (RAM), memory, read-only deposit
Reservoir (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or technology
In any other form of storage medium well known in field.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments in the case where not departing from core of the invention thought or scope.Therefore, originally
Invention is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein
Consistent widest scope.
Claims (10)
1. a kind of three-way catalytic converter aging detection method, which is characterized in that be applied to Vehicle Controller, which comprises
After engine exits towing astern operating condition, the default parameter for influencing ternary catalyzing unit bed temperature is obtained；
If the default parameter meets preset condition, the oxygen storage amount of the ternary catalyzing unit is calculated；
If the oxygen storage amount is lower than default oxygen storage capacity threshold value, the three-way catalytic converter aging is determined.
2. three-way catalytic converter aging detection method according to claim 1, which is characterized in that the calculating ternary is urged
Change the oxygen storage amount of device, comprising:
It determines at the time of the engine exits towing astern operating condition as oxygen consumption initial time；
It is oxygen consumption end time at the time of the oxygen for determining that the ternary catalyzing unit is stored is exhausted；
The oxygen consumption initial time and the oxygen consumption end time are substituted into following formula, the ternary catalyzing unit is calculated
Oxygen storage amount:
Wherein, m indicates the oxygen storage amount of the ternary catalyzing unit, mg；
t1Indicate the oxygen consumption initial time, s；
t2Indicate the oxygen consumption end time, s；
Lambda indicates excess air coefficient；
N indicates the exhaust gas mass flow, mg/s；
P indicates the mass fraction of oxygen duty gas, %.
3. three-way catalytic converter aging detection method according to claim 2, which is characterized in that the ternary catalyzing unit outlet
End setting lambda sensor, when being terminated at the time of the oxygen that the determination ternary catalyzing unit is stored is exhausted for oxygen consumption
It carves, comprising:
Monitor the voltage value of the lambda sensor；
It determines and is deposited at the time of correspondence when the voltage value of the lambda sensor is greater than predetermined voltage threshold by the ternary catalyzing unit
The oxygen consumption end time that the oxygen of storage is exhausted.
4. three-way catalytic converter aging detection method according to claim 2, which is characterized in that further include:
After the engine exits towing astern operating condition, the lambda < 1 is maintained.
5. three-way catalytic converter aging detection method according to claim 4, which is characterized in that if the default parameter meets
Preset condition, it is described after the engine exits towing astern operating condition, maintain the lambda < 1, comprising:
Towing astern operating condition is exited from the engine, until maintaining the lambda < in duration corresponding to the oxygen consumption end time
1。
6. three-way catalytic converter aging detection method according to claim 4, which is characterized in that if the default parameter is discontented
Sufficient preset condition, it is described after the engine exits towing astern operating condition, maintain the lambda < 1, comprising:
Towing astern operating condition is exited from the engine, until the oxygen consumption of the ternary catalyzing unit reaches with reference to the default of oxygen storage capacity
In duration corresponding to ratio, the lambda < 1 is maintained.
7. three-way catalytic converter aging detection method according to claim 1-6, which is characterized in that if described default
Parameter includes engine coolant temperature, and the preset condition includes that the engine coolant temperature is in default coolant liquid temperature
It spends in range；
If the default parameter includes Engine Inlet Temperature, the preset condition includes that the Engine Inlet Temperature is in pre-
If within the scope of intake air temperature；
If the default parameter includes the ternary catalyzing unit temperature, the preset condition includes at the ternary catalyzing unit temperature
In within the scope of default catalyst temperature；
If the default parameter includes engine speed, the preset condition includes that the engine speed is in preset rotation speed model
In enclosing；
If the default parameter includes the storage oxygen duration that engine is in towing astern operating condition, when the preset condition includes the storage oxygen
It is long to be stored up within the scope of oxygen duration in default；
If the default parameter includes the air mass that engine is in towing astern operating condition, the preset condition includes the air inlet matter
Amount is within the scope of default air mass.
8. three-way catalytic converter aging detection method according to claim 7, which is characterized in that calculate the air mass
Method, comprising:
The storage oxygen initial time that the engine enters towing astern operating condition is obtained, and, the engine exits down the storage of support operating condition
Oxygen end time；
It calculates in duration corresponding to the storage oxygen initial time to the storage oxygen end time, flows through the tail gas of the engine
The integrated value of flow obtains the air mass that the engine is in towing astern operating condition.
9. three-way catalytic converter aging detection method according to claim 1-6, which is characterized in that the vehicle-mounted control
When electric under device processed, the oxygen storage amount is stored.
10. a kind of three-way catalytic converter aging detection device characterized by comprising
Acquiring unit, for obtaining the default parameter for influencing ternary catalyzing unit bed temperature after engine exits towing astern operating condition；
Computing unit calculates the oxygen storage amount of the ternary catalyzing unit if meeting preset condition for the default parameter；
Judging unit determines the three-way catalytic converter aging if being lower than default oxygen storage capacity threshold value for the oxygen storage amount.
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| CN111188670A (en) * | 2020-04-08 | 2020-05-22 | 潍柴动力股份有限公司 | Three-way catalyst control method and device |
| 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 |
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