CN111188670A - Three-way catalyst control method and device - Google Patents
Three-way catalyst control method and device Download PDFInfo
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- CN111188670A CN111188670A CN202010269739.8A CN202010269739A CN111188670A CN 111188670 A CN111188670 A CN 111188670A CN 202010269739 A CN202010269739 A CN 202010269739A CN 111188670 A CN111188670 A CN 111188670A
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- 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
- F01N3/18—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 characterised by methods of operation; Control
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Materials Engineering (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The invention provides a three-way catalyst control method and a device, which are applied to the technical field of engines. The oxygen storage threshold of the method is set based on the oxygen storage amount of the fresh three-way catalyst, if the current oxygen storage amount variation is larger than a preset correction threshold, the three-way catalyst is judged to be aged, namely, the modulation parameter of the excess air coefficient is corrected according to the current oxygen storage amount variation, so that the corrected modulation parameter is matched with the current oxygen storage capacity of the three-way catalyst, and the three-way catalyst can still work in a high conversion rate state.
Description
Technical Field
The invention belongs to the technical field of engines, and particularly relates to a three-way catalyst control method and device.
Background
The Three-Way Catalyst (Three-Way-Catalyst) can convert harmful gases such as CO, HC and NOx discharged by automobile exhaust into harmless carbon dioxide, water and nitrogen through oxidation and reduction, and is the most important external purifying device installed in an automobile exhaust system.
The excess air coefficient is an important factor influencing the conversion efficiency of the three-way catalyst, and the emission treatment effect of the automobile exhaust is directly influenced by the conversion efficiency of the three-way catalyst, so that in order to ensure that the three-way catalyst treats the automobile exhaust with high conversion rate as much as possible and improve the emission treatment effect, in actual use, the corresponding controller can adjust the excess air coefficient of the three-way catalyst according to preset modulation parameters.
The inventor researches and finds that when the excess air coefficient is adjusted according to the preset modulation parameters, the three-way catalyst is in a fresh state without problems, but the three-way catalyst is gradually aged along with the use of the three-way catalyst, and if the excess air coefficient is adjusted according to the preset modulation parameters, the three-way catalyst cannot work in a high conversion rate state, so that the treatment effect of automobile exhaust is reduced.
Disclosure of Invention
In view of the above, the present invention aims to provide a three-way catalyst control method and device, which corrects a modulation parameter of an excess air coefficient based on a change in oxygen storage capacity of the three-way catalyst, so that the three-way catalyst can work in a high conversion rate state as much as possible, and a treatment effect of automobile exhaust gas is ensured, and the specific scheme is as follows:
in a first aspect, the present invention provides a three-way catalyst control method, including:
calculating the current oxygen storage amount of the three-way catalyst;
calculating a difference value between a preset oxygen storage threshold and the current oxygen storage amount to obtain a current oxygen storage amount variation, wherein the oxygen storage threshold is set based on the oxygen storage amount of the fresh three-way catalyst;
if the current oxygen storage amount variation is larger than a preset correction threshold, correcting a modulation parameter of an excess air coefficient according to the current oxygen storage amount variation;
and adjusting the excess air coefficient of the three-way catalyst according to the corrected modulation parameter.
Optionally, the modifying the modulation parameter of the excess air coefficient according to the current oxygen storage amount variation includes:
correcting the modulation period of the excess air coefficient according to the current oxygen storage amount variation;
and correcting the modulation amplitude of the excess air coefficient according to the current oxygen storage amount variation.
Optionally, the modifying the modulation period of the excess air coefficient according to the current oxygen storage amount variation includes:
calling a first preset mapping relation, wherein the first preset mapping relation records the corresponding relation between the oxygen storage quantity variation and the modulation period;
and according to the first preset mapping relation, taking the modulation period corresponding to the current oxygen storage amount variation as the modified modulation period.
Optionally, the modifying the modulation amplitude of the excess air coefficient according to the current oxygen storage amount variation includes:
calling a second preset mapping relation, wherein the second preset mapping relation records the corresponding relation between the oxygen storage quantity variation and the modulation amplitude;
and according to the second preset mapping relation, taking the modulation amplitude corresponding to the current oxygen storage amount variation as the modified modulation amplitude.
Optionally, the calculating the current oxygen storage amount of the three-way catalyst comprises:
judging whether the three-way catalyst meets a preset detection condition or not;
and if the three-way catalyst meets the preset detection condition, calculating the current oxygen storage amount of the three-way catalyst.
Optionally, the calculating the current oxygen storage amount of the three-way catalyst includes:
calculating the current oxygen storage amount of the three-way catalyst according to the following formula:
wherein m represents the current oxygen storage amount of the three-way catalyst, mg;
t1represents the initial moment of oxygen consumption, s;
t2represents the oxygen consumption termination time, s;
lambda represents the excess air factor;
n represents the mass flow of the tail gas, mg/s;
p represents the mass fraction of oxygen in the air,%.
Optionally, the preset detection condition at least includes one of the following detection conditions:
setting the state quantity of the excess air coefficient closed-loop control;
the three-way catalyst works normally;
the rotating speed of the engine is within a preset rotating speed range;
the engine exhaust temperature is greater than a preset temperature threshold.
In a second aspect, the present invention provides a three-way catalyst control device including:
the first calculation unit is used for calculating the current oxygen storage amount of the three-way catalyst;
the second calculation unit is used for calculating a difference value between a preset oxygen storage amount threshold and the current oxygen storage amount to obtain a current oxygen storage amount variation, wherein the oxygen storage amount threshold is set based on the oxygen storage amount of the fresh three-way catalyst;
the correction unit is used for correcting the modulation parameter of the excess air coefficient according to the current oxygen storage amount variation if the current oxygen storage amount variation is larger than a preset correction threshold;
and the adjusting unit is used for adjusting the excess air coefficient of the three-way catalyst according to the corrected modulation parameter.
Optionally, the correcting unit, when being configured to correct the modulation parameter of the excess air coefficient according to the current oxygen storage amount variation, specifically includes:
correcting the modulation period of the excess air coefficient according to the current oxygen storage amount variation;
and correcting the modulation amplitude of the excess air coefficient according to the current oxygen storage amount variation.
Optionally, the correcting unit, when correcting the modulation period of the excess air coefficient according to the current oxygen storage amount variation, specifically includes:
calling a first preset mapping relation, wherein the first preset mapping relation records the corresponding relation between the oxygen storage quantity variation and the modulation period;
and according to the first preset mapping relation, taking the modulation period corresponding to the current oxygen storage amount variation as the modified modulation period.
The three-way catalyst control method provided by the invention comprises the steps of firstly calculating the current oxygen storage amount of the three-way catalyst, further calculating the difference value between the preset oxygen storage amount threshold and the current oxygen storage amount to obtain the current oxygen storage amount variation, correcting the modulation parameter of the excess air coefficient according to the current oxygen storage amount variation if the obtained current oxygen storage amount variation is larger than the preset correction threshold, and adjusting the excess air coefficient of the three-way catalyst according to the corrected modulation parameter. In the control method provided by the invention, the oxygen storage threshold is set based on the oxygen storage amount of the fresh three-way catalyst, if the three-way catalyst is aged, the oxygen storage amount is smaller than the oxygen storage amount threshold, therefore, if the current oxygen storage amount variation is larger than the preset correction threshold, the three-way catalyst is judged to be aged, under the condition, the modulation parameter of the excess air coefficient is corrected according to the current oxygen storage amount variation, so that the corrected modulation parameter is matched with the current oxygen storage capacity of the three-way catalyst, and the three-way catalyst can still work in a high conversion rate state, compared with the control method in the prior art which always adopts the preset modulation parameter, the control method corrects the modulation parameter according to the variation of the oxygen storage capacity of the three-way catalyst, changes the variation range of the excess air coefficient, and enables the three-way catalyst to work in a high conversion rate state as much as possible, the treatment effect of the automobile exhaust is ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a flowchart of a three-way catalyst control method provided in an embodiment of the present application;
FIG. 2 is a block diagram showing a three-way catalyst control device according to an embodiment of the present invention;
fig. 3 is a block diagram of a controller according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the control logic of a three-way catalyst, oxygen storage is often used to characterize the conversion efficiency of the three-way catalyst. The inventor researches and discovers that the oxygen storage amount of the fresh three-way catalyst is high, the range of the air excess coefficient lambda corresponding to the fresh three-way catalyst is large when the three-way catalyst works in a high conversion rate state, but the three-way catalyst inevitably and gradually ages along with the use of the three-way catalyst, and the oxygen storage amount is correspondingly reduced, in this case, the range of the air excess coefficient lambda corresponding to the three-way catalyst when the three-way catalyst works in the high conversion rate state is correspondingly changed, in this case, if the catalyst is still controlled according to the lambda range corresponding to the fresh three-way catalyst, the conversion efficiency of the three-way catalyst is obviously reduced, the emission treatment effect of a vehicle is influenced, and even relevant regulation requirements can not be met.
Based on the above premise, an embodiment of the present invention provides a three-way catalyst control method, and referring to fig. 1, fig. 1 is a flowchart of the three-way catalyst control method provided in the embodiment of the present invention, and the method may be applied to a controller corresponding to the three-way catalyst, and of course, may also be applied to a controller with data processing capability, such as a vehicle controller or other traveling computers installed in a vehicle; in some cases, the method can also be applied to a server on the network side. Referring to fig. 1, a flow of a three-way catalyst control method provided by an embodiment of the present invention may include:
s100, calculating the current oxygen storage amount of the three-way catalyst.
The three-way catalyst mainly depends on the oxygen absorbing and releasing capacity of the noble metal inside the device to maintain the conversion efficiency, and therefore, the conversion efficiency of the three-way catalyst is usually measured by the oxygen storage amount. Based on the basic principle of the three-way catalyst, the three-way catalyst control method provided by the embodiment of the invention firstly needs to calculate the current oxygen storage amount of the three-way catalyst in order to verify whether the three-way catalyst is aged or not.
Optionally, in order to ensure that the calculation result or the execution of the subsequent steps is effective, the control method provided in the embodiment of the present invention further sets some preset detection conditions, and if it is determined that the three-way catalyst meets the preset detection conditions, it is indicated that the three-way catalyst is currently operable normally, and further, other related systems on the vehicle do not affect the operation of the three-way catalyst, so that the calculation of the current oxygen storage amount and the execution of the subsequent steps have practical significance; on the contrary, if it is judged that the three-way catalyst does not satisfy the preset detection condition, the present step and the subsequent steps are not continuously performed.
Specifically, the preset detection conditions provided in the embodiment of the present invention at least include:
setting the state quantity of the excess air coefficient closed-loop control;
the three-way catalyst works normally;
the rotating speed of the engine is in a preset rotating speed range;
the engine exhaust temperature is greater than a preset temperature threshold.
In practical use, one or more of the detection conditions may be selected according to requirements, and the specific setting number of the preset detection conditions is not limited in the embodiment of the present invention.
In the preset detection condition, setting the state quantity of the closed-loop control of the excess air coefficient, presetting the state quantity of the closed-loop control of the excess air coefficient in the existing control logic, and setting the state quantity when the three-way catalyst successfully enters the closed-loop control of the excess air coefficient;
for a three-way catalyst to work properly, it means that no fault signal is detected regarding excess air ratio control and three-way catalyst diagnostics during the current control cycle.
Further, the engine speed is within a preset speed range, and the engine exhaust temperature is greater than a preset temperature threshold value, which are set based on the requirement of stable operation of the three-way catalyst.
Optionally, an embodiment of the present invention further provides a method for specifically calculating a current oxygen storage amount of a three-way catalyst, and specifically, the current oxygen storage amount of the three-way catalyst may be calculated according to the following formula.
Wherein m represents the current oxygen storage amount of the three-way catalyst, mg;
t1represents the initial moment of oxygen consumption, s;
t2represents the oxygen consumption termination time, s;
lambda represents the excess air factor;
n represents the mass flow of the tail gas, mg/s;
p represents the mass fraction of oxygen in the air,%.
It should be noted that, the oxygen consumption starting time and the oxygen consumption ending time of the three-way catalyst can be determined according to the methods in the prior art, the specific selection of the three-way catalyst and the oxygen consumption starting time is not limited in the invention, and the limiting methods in the prior art are optional.
And S110, calculating a difference value between a preset oxygen storage threshold and the current oxygen storage amount to obtain the current oxygen storage amount variation.
Optionally, the oxygen storage amount threshold is set based on the oxygen storage amount of the fresh three-way catalyst, and the threshold may be directly set to the maximum oxygen storage amount corresponding to the fresh three-way catalyst, and of course, a value slightly smaller than the maximum oxygen storage amount may be taken as the oxygen storage amount threshold according to the actual operation experience, or a value slightly larger than the maximum oxygen storage amount may be taken as the oxygen storage amount threshold.
And calculating the difference value between the preset oxygen storage amount threshold and the calculated current oxygen storage amount to obtain the current oxygen storage amount variation.
And S120, judging whether the current oxygen storage amount variation is larger than a preset correction threshold, if so, executing S130, otherwise, returning to execute S100.
And comparing the calculated current oxygen storage amount variation with a preset correction threshold, executing S130 if the current oxygen storage amount variation is larger than the preset correction threshold, and returning to execute S100 to perform the control process of the next period if the current oxygen storage amount variation is not larger than the preset correction threshold.
It should be noted that the setting of the preset correction threshold may be given manually according to actual design experience and use experience of the three-way catalyst, and the specific selection of the preset correction threshold is not limited in the present invention.
And S130, correcting the modulation parameter of the excess air coefficient according to the current oxygen storage amount variation.
When the three-way catalyst is controlled to be in a high-efficiency working state, the excess air coefficient needs to be controlled to change between rich and lean, and in practical application, the excess air coefficient is adjusted by adjusting the fuel gas injection quantity. The specific adjustment process can be controlled by two modulation parameters, namely modulation period and modulation amplitude.
Wherein, the modulation period determines the period of the excess air coefficient changing from lean to rich; the modulation amplitude determines a correction coefficient of the gas injection quantity, is a negative value when the excess air factor needs to be adjusted to be lean, and is a positive value when the excess air factor needs to be adjusted to be rich.
Based on the above situation, the step specifically needs to respectively correct the modulation period and the modulation amplitude of the excess air coefficient according to the current oxygen storage amount variation.
Optionally, an embodiment of the present invention provides a first preset mapping relationship, where a corresponding relationship between an oxygen storage amount variation and a modulation period is recorded in the first preset mapping relationship, and different oxygen storage amount variations correspond to different modulation periods.
And calling the first preset mapping relation, inquiring the corresponding relation recorded in the first preset mapping relation, determining a modulation period corresponding to the current oxygen storage amount variation obtained by current period calculation, and taking the modulation period as the modified modulation period.
Optionally, an embodiment of the present invention provides a second preset mapping relationship, where a corresponding relationship between an oxygen storage amount variation and a modulation amplitude is recorded in the second preset mapping relationship, and different oxygen storage amount variations correspond to different modulation amplitudes.
And calling a second preset mapping relation, inquiring the corresponding relation recorded in the second preset mapping relation, determining a modulation amplitude corresponding to the current oxygen storage amount variation obtained by current period calculation, and taking the modulation amplitude as the modified modulation amplitude.
It should be noted that, for the first preset mapping relationship and the second preset mapping relationship, the aged three-way catalyst may be used as a test object, and a variation range of the excess air coefficient corresponding to the aged three-way catalyst working in a high efficiency state is determined through continuous tests, so as to determine a modulation parameter of the excess air coefficient. Any method capable of establishing the first preset mapping relationship and the second preset mapping relationship is within the scope of the present invention without departing from the scope of the core idea of the present invention.
And S140, adjusting the excess air coefficient of the three-way catalyst according to the corrected modulation parameter.
After the corrected modulation parameters are obtained, the excess air coefficient of the three-way catalyst can be adjusted according to the corrected modulation parameters.
It is conceivable that the process of adjusting the three-way catalyst according to the modified modulation parameter is identical to the process of adjusting the three-way catalyst according to the preset modulation parameter, and the specific adjustment process can be realized by referring to the prior art, and is not described herein again.
In summary, in the control method provided by the present invention, the oxygen storage threshold is set based on the oxygen storage amount of the fresh three-way catalyst, and if the three-way catalyst is aged, the oxygen storage amount is smaller than the oxygen storage amount threshold, therefore, if the current oxygen storage amount variation is larger than the preset correction threshold, it is determined that the three-way catalyst is aged, in this case, the modulation parameter of the excess air coefficient is corrected according to the current oxygen storage amount variation, so that the corrected modulation parameter is adapted to the current oxygen storage capacity of the three-way catalyst, and further, the three-way catalyst can still work in the high conversion rate state, compared with the control method in the prior art that the preset modulation parameter is always adopted, the control method corrects the modulation parameter according to the variation of the oxygen storage capacity of the three-way catalyst, changes the variation range of the excess air coefficient, so that the three-way catalyst can work in the high conversion rate state as much as possible, the treatment effect of the automobile exhaust is ensured.
The three-way catalyst control device provided by the embodiment of the invention is introduced below, and the three-way catalyst control device described below can be regarded as a functional module architecture which needs to be arranged in central equipment for realizing the three-way catalyst control method provided by the embodiment of the invention; the following description may be cross-referenced with the above.
Fig. 3 is a block diagram of a three-way catalyst control device according to an embodiment of the present invention, and referring to fig. 3, the device may include:
a first calculation unit 10 for calculating the current oxygen storage amount of the three-way catalyst;
the second calculating unit 20 is configured to calculate a difference between a preset oxygen storage threshold and the current oxygen storage amount to obtain a current oxygen storage amount variation, where the oxygen storage threshold is set based on the oxygen storage amount of the fresh three-way catalyst;
the correction unit 30 is configured to correct a modulation parameter of the excess air coefficient according to the current oxygen storage amount variation if the current oxygen storage amount variation is larger than a preset correction threshold;
and an adjusting unit 40 for adjusting the excess air ratio of the three-way catalyst according to the corrected modulation parameter.
Optionally, the correcting unit 30 is configured to, when correcting the modulation parameter of the excess air coefficient according to the current oxygen storage amount variation, specifically include:
correcting the modulation period of the excess air coefficient according to the current oxygen storage amount variation;
and correcting the modulation amplitude of the excess air coefficient according to the current oxygen storage amount variation.
Optionally, the correcting unit 30 is configured to, when correcting the modulation period of the excess air coefficient according to the current oxygen storage amount variation, specifically include:
calling a first preset mapping relation, wherein the first preset mapping relation records the corresponding relation between the oxygen storage quantity variation and the modulation period;
and according to the first preset mapping relation, taking the modulation period corresponding to the current oxygen storage amount variation as the modified modulation period.
Optionally, the correcting unit 30 is configured to, when correcting the modulation amplitude of the excess air coefficient according to the current oxygen storage amount variation, specifically include:
calling a second preset mapping relation, wherein the second preset mapping relation records the corresponding relation between the oxygen storage quantity variation and the modulation amplitude;
and according to the second preset mapping relation, taking the modulation amplitude corresponding to the current oxygen storage amount variation as the modified modulation amplitude.
Optionally, the first calculating unit 10 is configured to, when calculating the current oxygen storage amount of the three-way catalyst, specifically include:
judging whether the three-way catalyst meets a preset detection condition or not;
and if the three-way catalyst meets the preset detection condition, calculating the current oxygen storage amount of the three-way catalyst.
Optionally, the first calculating unit 10 is configured to calculate a current oxygen storage amount of the three-way catalyst, and includes:
calculating the current oxygen storage amount of the three-way catalyst according to the following formula:
wherein m represents the current oxygen storage amount of the three-way catalyst, mg;
t1represents the initial moment of oxygen consumption, s;
t2represents the oxygen consumption termination time, s;
lambda represents the excess air factor;
n represents the mass flow of the tail gas, mg/s;
p represents the mass fraction of oxygen in the air,%.
Optionally, the preset detection condition at least includes one of the following detection conditions:
setting the state quantity of the excess air coefficient closed-loop control;
the three-way catalyst works normally;
the rotating speed of the engine is within a preset rotating speed range;
the engine exhaust temperature is greater than a preset temperature threshold.
Optionally, fig. 3 is a block diagram of a controller according to an embodiment of the present invention, and as shown in fig. 3, the block diagram may include: at least one processor 100, at least one communication interface 200, at least one memory 300, and at least one communication bus 400;
in the embodiment of the present invention, the number of the processor 100, the communication interface 200, the memory 300, and the communication bus 400 is at least one, and the processor 100, the communication interface 200, and the memory 300 complete the communication with each other through the communication bus 400; it is clear that the communication connections shown by the processor 100, the communication interface 200, the memory 300 and the communication bus 400 shown in fig. 3 are merely optional;
optionally, the communication interface 200 may be an interface of a communication module, such as an interface of a GSM module;
the processor 100 may be a central processing unit CPU or an application specific Integrated circuit asic or one or more Integrated circuits configured to implement embodiments of the present invention.
The memory 300, which stores application programs, may include a high-speed RAM memory, and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory.
The processor 100 is specifically configured to execute an application program in the memory to implement any of the embodiments of the three-way catalyst control method described above.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A three-way catalyst control method characterized by comprising:
calculating the current oxygen storage amount of the three-way catalyst;
calculating a difference value between a preset oxygen storage threshold and the current oxygen storage amount to obtain a current oxygen storage amount variation, wherein the oxygen storage threshold is set based on the oxygen storage amount of the fresh three-way catalyst;
if the current oxygen storage amount variation is larger than a preset correction threshold, correcting a modulation parameter of an excess air coefficient according to the current oxygen storage amount variation;
and adjusting the excess air coefficient of the three-way catalyst according to the corrected modulation parameter.
2. The three-way catalyst control method according to claim 1, wherein the correcting the modulation parameter of the excess air ratio according to the current oxygen storage amount change amount includes:
correcting the modulation period of the excess air coefficient according to the current oxygen storage amount variation;
and correcting the modulation amplitude of the excess air coefficient according to the current oxygen storage amount variation.
3. The three-way catalyst control method according to claim 2, wherein the correcting the modulation period of the excess air ratio according to the current oxygen storage amount change amount includes:
calling a first preset mapping relation, wherein the first preset mapping relation records the corresponding relation between the oxygen storage quantity variation and the modulation period;
and according to the first preset mapping relation, taking the modulation period corresponding to the current oxygen storage amount variation as the modified modulation period.
4. The three-way catalyst control method according to claim 2, wherein the correcting the modulation amplitude of the excess air ratio according to the current oxygen storage amount change amount includes:
calling a second preset mapping relation, wherein the second preset mapping relation records the corresponding relation between the oxygen storage quantity variation and the modulation amplitude;
and according to the second preset mapping relation, taking the modulation amplitude corresponding to the current oxygen storage amount variation as the modified modulation amplitude.
5. The three-way catalyst control method according to claim 1, wherein the calculating a current oxygen storage amount of the three-way catalyst includes:
judging whether the three-way catalyst meets a preset detection condition or not;
and if the three-way catalyst meets the preset detection condition, calculating the current oxygen storage amount of the three-way catalyst.
6. The three-way catalyst control method according to claim 5, wherein the calculating a current oxygen storage amount of the three-way catalyst includes:
calculating the current oxygen storage amount of the three-way catalyst according to the following formula:
wherein m represents the current oxygen storage amount of the three-way catalyst, mg;
t1represents the initial moment of oxygen consumption, s;
t2represents the oxygen consumption termination time, s;
lambda represents the excess air factor;
n represents the mass flow of the tail gas, mg/s;
p represents the mass fraction of oxygen in the air,%.
7. The three-way catalyst control method according to claim 5, characterized in that the preset detection condition includes at least one of the following detection conditions:
setting the state quantity of the excess air coefficient closed-loop control;
the three-way catalyst works normally;
the rotating speed of the engine is in a preset rotating speed range;
the engine exhaust temperature is greater than a preset temperature threshold.
8. A three-way catalyst control device characterized by comprising:
the first calculation unit is used for calculating the current oxygen storage amount of the three-way catalyst;
the second calculation unit is used for calculating a difference value between a preset oxygen storage amount threshold and the current oxygen storage amount to obtain a current oxygen storage amount variation, wherein the oxygen storage amount threshold is set based on the oxygen storage amount of the fresh three-way catalyst;
the correction unit is used for correcting the modulation parameter of the excess air coefficient according to the current oxygen storage amount variation if the current oxygen storage amount variation is larger than a preset correction threshold;
and the adjusting unit is used for adjusting the excess air coefficient of the three-way catalyst according to the corrected modulation parameter.
9. The three-way catalyst control device according to claim 8, wherein the correction unit, when correcting the modulation parameter of the excess air ratio based on the current oxygen storage amount change amount, specifically includes:
correcting the modulation period of the excess air coefficient according to the current oxygen storage amount variation;
and correcting the modulation amplitude of the excess air coefficient according to the current oxygen storage amount variation.
10. The three-way catalyst control device according to claim 9, wherein the correction unit, when correcting the modulation cycle of the excess air ratio based on the current amount of change in the oxygen storage amount, specifically includes:
calling a first preset mapping relation, wherein the first preset mapping relation records the corresponding relation between the oxygen storage quantity variation and the modulation period;
and according to the first preset mapping relation, taking the modulation period corresponding to the current oxygen storage amount variation as the modified modulation period.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111946472A (en) * | 2020-07-24 | 2020-11-17 | 东风汽车集团有限公司 | Exhaust temperature protection method based on air-fuel ratio and oxygen storage amount of catalyst |
| CN111997725A (en) * | 2020-09-09 | 2020-11-27 | 东风汽车有限公司 | Vehicle-mounted catalytic converter abnormity diagnosis and electronic equipment |
| CN112730568A (en) * | 2020-12-07 | 2021-04-30 | 潍柴动力股份有限公司 | Method, device, equipment and medium for verifying detection result of nitrogen oxide sensor |
| CN114810391A (en) * | 2022-04-29 | 2022-07-29 | 广西玉柴机器股份有限公司 | Control strategy for implementing oxygen storage compensation of degradation catalyst |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102322324A (en) * | 2011-07-27 | 2012-01-18 | 长安大学 | Vehicle-mounted monitoring system and method for three-way catalytic converter for vehicle |
| US9896988B2 (en) * | 2015-12-10 | 2018-02-20 | Hyundai Motor Company | Three way catalytic control method and system for decreasing fuel consumption and vehicle having the same |
| CN109937293A (en) * | 2016-11-10 | 2019-06-25 | 罗伯特·博世有限公司 | Method for adjusting the fuel/air rate of combustion motors |
| CN110284947A (en) * | 2019-06-28 | 2019-09-27 | 潍柴动力股份有限公司 | A kind of three-way catalytic converter aging detection method and device |
-
2020
- 2020-04-08 CN CN202010269739.8A patent/CN111188670A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102322324A (en) * | 2011-07-27 | 2012-01-18 | 长安大学 | Vehicle-mounted monitoring system and method for three-way catalytic converter for vehicle |
| US9896988B2 (en) * | 2015-12-10 | 2018-02-20 | Hyundai Motor Company | Three way catalytic control method and system for decreasing fuel consumption and vehicle having the same |
| CN109937293A (en) * | 2016-11-10 | 2019-06-25 | 罗伯特·博世有限公司 | Method for adjusting the fuel/air rate of combustion motors |
| CN110284947A (en) * | 2019-06-28 | 2019-09-27 | 潍柴动力股份有限公司 | A kind of three-way catalytic converter aging detection method and device |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111946472A (en) * | 2020-07-24 | 2020-11-17 | 东风汽车集团有限公司 | Exhaust temperature protection method based on air-fuel ratio and oxygen storage amount of catalyst |
| CN111946472B (en) * | 2020-07-24 | 2021-07-06 | 东风汽车集团有限公司 | Exhaust temperature protection method based on air-fuel ratio and oxygen storage amount of catalyst |
| CN111997725A (en) * | 2020-09-09 | 2020-11-27 | 东风汽车有限公司 | Vehicle-mounted catalytic converter abnormity diagnosis and electronic equipment |
| CN111997725B (en) * | 2020-09-09 | 2022-01-07 | 东风汽车有限公司 | Vehicle-mounted catalytic converter abnormity diagnosis and electronic equipment |
| CN112730568A (en) * | 2020-12-07 | 2021-04-30 | 潍柴动力股份有限公司 | Method, device, equipment and medium for verifying detection result of nitrogen oxide sensor |
| CN112730568B (en) * | 2020-12-07 | 2023-04-18 | 潍柴动力股份有限公司 | Method, device, equipment and medium for verifying detection result of nitrogen oxide sensor |
| CN114810391A (en) * | 2022-04-29 | 2022-07-29 | 广西玉柴机器股份有限公司 | Control strategy for implementing oxygen storage compensation of degradation catalyst |
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