CN112267929B - Method for saving precious metal consumption of three-way catalyst, tail gas treatment system and vehicle - Google Patents
Method for saving precious metal consumption of three-way catalyst, tail gas treatment system and vehicle Download PDFInfo
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- CN112267929B CN112267929B CN202011110648.6A CN202011110648A CN112267929B CN 112267929 B CN112267929 B CN 112267929B CN 202011110648 A CN202011110648 A CN 202011110648A CN 112267929 B CN112267929 B CN 112267929B
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- 239000003054 catalyst Substances 0.000 title claims abstract description 128
- 238000000034 method Methods 0.000 title claims abstract description 30
- 239000010970 precious metal Substances 0.000 title claims abstract description 13
- 239000007789 gas Substances 0.000 claims description 41
- 230000032683 aging Effects 0.000 claims description 36
- 238000010438 heat treatment Methods 0.000 claims description 21
- 229910000510 noble metal Inorganic materials 0.000 claims description 20
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical group [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 9
- 239000001301 oxygen Substances 0.000 claims description 9
- 229910052760 oxygen Inorganic materials 0.000 claims description 9
- 230000008859 change Effects 0.000 claims description 8
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 6
- 239000000243 solution Substances 0.000 description 6
- 239000003921 oil Substances 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 229910002092 carbon dioxide Inorganic materials 0.000 description 3
- 239000001569 carbon dioxide Substances 0.000 description 3
- 230000003197 catalytic effect Effects 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910001868 water Inorganic materials 0.000 description 2
- 206010008428 Chemical poisoning Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 230000033116 oxidation-reduction process Effects 0.000 description 1
- 230000036284 oxygen consumption Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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Classifications
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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
- F01N3/20—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 specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
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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
- F01N11/002—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus
-
- 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
- F01N3/20—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 specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
- F01N3/2013—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using electric or magnetic heating means
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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
-
- 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)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The invention relates to the technical field of tail gas treatment, and particularly discloses a method for saving the precious metal consumption of a three-way catalyst, a tail gas treatment system and a vehicle.
Description
Technical Field
The invention relates to the technical field of tail gas treatment, in particular to a method for saving the consumption of noble metal of a three-way catalyst, a tail gas treatment system and a vehicle.
Background
The three-way catalyst is the most important external purifying device installed in the automobile exhaust system, and can convert harmful gases such as CO, HC and NOx discharged by automobile exhaust into harmless carbon dioxide, water and nitrogen by using a noble metal catalyst. When high-temperature gas tail gas passes through the purification device, the activity of three gases of CO, HC and NOx is enhanced by the noble metal catalyst in the three-way catalyst, so that the three gases are promoted to carry out certain oxidation-reduction chemical reaction, wherein CO is oxidized into colorless and nontoxic carbon dioxide gas at high temperature; HC compounds are oxidized at high temperature to water and carbon dioxide; NOx is reduced to nitrogen and oxygen. Three kinds of harmful gases are changed into harmless gases, so that the automobile exhaust can be purified.
In the use process of the noble metal catalyst, due to high-temperature fire, chemical poisoning, coking and blockage, the phenomena of catalyst energy efficiency deviation and degradation, namely the catalyst aging phenomenon, can occur. At present, the phenomenon of catalyst aging is not specially treated, and the catalytic capability is greatly reduced after the catalyst is aged, so that the emission standard can be met before the catalyst is aged under the same condition, and the emission exceeds the standard after the catalyst is aged. In this regard, in order to improve the durability of the three-way catalyst in the prior art, it is common to increase the amount of noble metal used. This method is much less effective and the cost increases greatly because more noble metals are simultaneously impacted by high temperature.
Disclosure of Invention
The invention aims to: the method for saving the precious metal consumption of the three-way catalyst, the tail gas treatment system and the vehicle are provided, so that the durability of the three-way catalyst is improved, and the precious metal consumption is not required to be increased.
In one aspect, the invention provides a method for saving the amount of noble metal used for a three-way catalyst, which comprises the following steps:
determining that the engine is in a preset working condition;
acquiring an aging coefficient of the three-way catalyst;
determining the lowest required temperature of normal operation of the three-way catalyst based on the aging coefficient according to the aging coefficient of the three-way catalyst and a relation curve between the aging coefficient of the three-way catalyst and the lowest required temperature of normal operation of the three-way catalyst;
acquiring and judging the inlet temperature of the three-way catalyst and the minimum required temperature;
if the inlet temperature of the three-way catalyst is less than the minimum required temperature; the heating assembly is controlled to operate to raise the temperature of the exhaust gas entering the three-way catalyst to the minimum required temperature.
As a preferred technical solution of the method for saving the amount of precious metal used in the three-way catalyst, the determining that the engine is in the preset working condition includes:
acquiring an ambient temperature T1, acquiring the rotating speed R of an engine, acquiring the intake pressure P of the engine, acquiring the torque request M of the engine, and acquiring the inlet temperature T2 of a three-way catalyst;
if the intake pressure P is greater than the preset pressure P1, the T1 is less than the first preset temperature T11, the R is greater than the preset rotating speed R1, and the T2 is less than the second preset temperature T12, the engine is judged to be in a preset working condition; or,
if the torque request is greater than the preset torque M1, T1 is less than a first preset temperature T11, R is greater than a preset rotation speed R1, and T2 is less than a second preset temperature T12, the engine is judged to be in a preset working condition.
As a preferable technical solution of the method for saving the amount of the noble metal used in the three-way catalyst, the obtaining the aging factor of the three-way catalyst includes:
acquiring parameters capable of causing the three-way catalyst to age, and acquiring an aging coefficient of the three-way catalyst based on the parameters according to the parameters and a relation curve of the parameters and the aging coefficient.
As a preferable technical scheme of the method for saving the consumption of the noble metal of the three-way catalyst, the parameter is the oxygen storage amount of the three-way catalyst.
As a preferred technical scheme of the method for saving the consumption of the noble metal of the three-way catalyst, the parameters are the accumulated running time of the engine, the accumulated exhaust temperature integral of the engine, the accumulated total mileage of the engine or the accumulated total oil consumption of the engine.
As a preferable technical solution of the method of saving the amount of noble metal used for the three-way catalyst, the operation is stopped if the inlet temperature of the three-way catalyst is greater than or equal to the minimum required temperature.
As a preferable technical solution of the method for saving the amount of precious metal used in the three-way catalyst, the controlling the operation of the heating assembly to raise the temperature of the exhaust gas entering the three-way catalyst to the minimum required temperature includes:
s1: acquiring a temperature parameter of the three-way catalyst;
if the temperature parameter is greater than or equal to the preset temperature parameter, executing S2;
s2: controlling the heating assembly to stop working, and returning to S1;
if the temperature parameter is less than the preset temperature parameter, executing S3;
s3: the heating assembly is controlled to operate, and returns to S1.
As a preferable technical solution of the method of saving the amount of noble metal used for the three-way catalyst, the temperature parameter includes any one of an inlet temperature, an outlet temperature, a rate of change in the inlet temperature, and a rate of change in the outlet temperature of the three-way catalyst.
In another aspect, the present invention provides an exhaust gas treatment system for implementing the method for saving precious metal consumption of a three-way catalyst in any of the above schemes, where the exhaust gas treatment system includes an exhaust gas pipeline connected to an engine, a three-way catalyst and a heating assembly disposed in the exhaust gas pipeline, and a controller.
In yet another aspect, the present disclosure provides a vehicle including the exhaust treatment system described above.
The invention has the beneficial effects that:
the invention provides a method for saving the precious metal consumption of a three-way catalyst, an exhaust gas treatment system and a vehicle.
Drawings
FIG. 1 is a schematic diagram of a method for saving the amount of noble metal used in a three-way catalyst in an embodiment of the invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood 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 description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Where the terms "first position" and "second position" are two different positions, and where a first feature is "over", "above" and "on" a second feature, it is intended that the first feature is directly over and obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
As shown in FIG. 1, the present embodiment provides a method for saving the amount of noble metal used in a three-way catalyst, which comprises
S100: and determining that the engine is in a preset working condition.
Specifically, the ambient temperature T1, the rotating speed R of the engine, the intake pressure P of the engine, the torque request M of the engine and the inlet temperature T2 of the three-way catalyst are obtained; if the intake pressure P is greater than the preset pressure P1, the T1 is less than the first preset temperature T11, the R is greater than the preset rotating speed R1, and the T2 is less than the second preset temperature T12, the engine is judged to be in a preset working condition; alternatively, if the torque request is greater than the preset torque M1, and T1 is less than the first preset temperature T11, and R is greater than the preset rotation speed R1, and T2 is less than the second preset temperature T12, it is determined that the engine is in the preset operating condition. Among them, the present embodiment exemplarily gives T11 ═ 25 ℃, R1 ═ 800R/min, P1 ═ 100 Kpa; t12 ═ 500 ℃ regime, and in other embodiments, the values of T11, R1, P1, M1, and T12 may also be set as desired. It is understood that when any one of the acquired ambient temperature T1, the engine speed R, and the three-way catalyst inlet temperature T2 does not satisfy the above-described condition, and the intake pressure P and the torque request M do not satisfy the above-described condition at the same time, the engine is considered to have not reached the preset condition. Accessible ambient temperature sensor measures ambient temperature, measures engine speed through speed sensor, detects the atmospheric pressure of engine air inlet pipeline through pressure sensor that admits air, detects the inlet temperature of three way catalyst converter through the temperature sensor who sets up in three way catalyst converter entrance.
S200: and acquiring the aging coefficient of the three-way catalyst.
The aging coefficient of the three-way catalyst can be used for evaluating the conversion performance of the three-way catalyst, when the aging coefficient of the three-way catalyst exceeds a set limit value, the three-way catalyst needs to be replaced in time to ensure that the emission of an engine does not exceed the standard, the aging degree of the catalyst can be monitored through the OBD, and the equivalent running time can be calculated.
Specifically, the equivalent runtime calculation method provided by this embodiment includes: the method comprises the steps of obtaining parameters capable of causing the three-way catalyst to age, and obtaining an aging coefficient of the three-way catalyst based on the parameters according to the parameters and a relation curve of the parameters and the aging coefficient.
Wherein the parameter can be the oxygen storage amount of the three-way catalyst and can be measured by a free oxygen sensor. The relation curve of the oxygen storage amount and the aging coefficient can be obtained through a large number of bench tests, and different model data and different working conditions are calibrated. When the engine stops oil injection/air injection, the air intake of the engine is pure air, correspondingly, the exhaust gas flowing through the three-way catalyst is relatively dilute (mainly air), and the three-way catalyst is in the state of storing oxygen; when the engine is out of the back-dragging working condition, the air inlet of the engine is recovered to be the mixed gas of fuel oil/fuel gas and air, the engine enters a normal working state, correspondingly, the three-way catalyst is in an oxygen consumption state, and the actual oxygen storage amount of the three-way catalyst can be obtained through calculation on the premise that the engine is fully stored with oxygen under the back-dragging working condition.
The parameter may also be an accumulated operating time of the engine, an accumulated exhaust temperature integral of the engine, an accumulated total mileage of the engine or an accumulated total oil consumption of the engine. The accumulated exhaust temperature integral of the engine refers to accumulated summation of the exhaust temperature before the catalyst at each operating point of the engine so as to reflect the loss condition of the catalyst. The accumulated running time of the engine can be simply obtained through the timer, the accumulated total oil consumption of the engine can be obtained through a bench test, the accumulated total mileage of the engine can be directly obtained through the odometer, the accumulated exhaust temperature integral of the engine can be obtained through directly summing the exhaust temperature, the obtained value is large, a corresponding small coefficient can be obtained according to the exhaust temperature of each working condition in the actual operation according to the direct proportion relation, then the coefficient is accumulated and summed, and finally the accumulated exhaust temperature integral of the engine can be obtained. The relationship curve of the accumulated running time of the engine and the aging coefficient, the relationship curve of the accumulated exhaust temperature integral of the engine and the aging coefficient, the relationship curve of the accumulated total mileage of the engine and the aging coefficient, and the relationship curve of the accumulated total oil consumption of the engine and the aging coefficient can be obtained by calibrating different model data and different working conditions through a large number of bench tests.
S300: and determining the lowest required temperature of the normal operation of the three-way catalyst based on the aging coefficient according to the aging coefficient of the three-way catalyst and a relation curve between the aging coefficient of the three-way catalyst and the lowest required temperature of the normal operation of the three-way catalyst.
The relation curve between the aging coefficient of the three-way catalyst and the minimum required temperature for normal operation of the three-way catalyst can be obtained by calibrating different model data and different working conditions through a large number of bench tests. The minimum required temperature refers to the temperature at which the three-way catalyst just can completely convert the tail gas entering the three-way catalyst into harmless gas under the current aging degree.
S400: and acquiring and judging the inlet temperature and the minimum required temperature of the three-way catalyst.
The temperature of the exhaust gas passing through the inlet of the three-way catalyst may be detected by a temperature sensor provided at the inlet of the three-way catalyst.
S500: if the inlet temperature of the three-way catalyst is less than the minimum required temperature; the heating assembly is controlled to operate to raise the temperature of exhaust gas entering the three-way catalyst to the minimum required temperature.
The minimum required temperature may be set as required, and generally, the minimum required temperature is greater than the inlet temperature of the three-way catalyst, and may be, for example, 500 ℃, 550 ℃, or 600 ℃.
Controlling the operation of the heating assembly to raise the temperature of exhaust entering the three-way catalyst to the minimum required temperature includes the following steps.
S1: acquiring a temperature parameter of the three-way catalyst;
if the temperature parameter is greater than or equal to the preset temperature parameter, executing S2;
s2: controlling the heating assembly to stop working, and returning to S1;
if the temperature parameter is less than the preset temperature parameter, executing S3;
s3: the heating assembly is controlled to operate, and returns to S1.
Based on the steps S1 to S3, closed-loop control of the heating temperature of the heating assembly through the temperature parameters of the three-way catalyst can be achieved, and the temperature of the tail gas entering the three-way catalyst is prevented from being lower than the minimum required temperature. The temperature parameter of the three-way catalyst may include any one of an inlet temperature, an outlet temperature, a rate of change of the inlet temperature, and a rate of change of the outlet temperature of the three-way catalyst. The temperature detection may be performed by temperature sensors provided at the inlet and outlet of the three-way catalyst. It can be understood that, on the premise that the aging coefficient of the three-way catalyst is fixed, the minimum required temperature of the three-way catalyst and the temperature parameter of the three-way catalyst have corresponding relations, and the relation curves of the minimum required temperature of the three-way catalyst and any one temperature parameter of the inlet temperature, the outlet temperature, the inlet temperature change rate and the outlet temperature change rate of the three-way catalyst can be obtained under the condition that the aging coefficients are preset in the controller, so that table look-up conversion is facilitated.
The heating component is arranged at the upstream of the three-way catalyst, and the heating component can comprise an electric control exhaust valve, an electric control air release valve, an electric heating grid and the like which are arranged on a tail gas pipeline.
S600: if it is determined that the inlet temperature of the three-way catalyst is greater than or equal to the minimum required temperature, stopping.
The temperature of the tail gas entering the three-way catalytic converter can meet the lowest temperature requirement of the three-way catalytic converter, and the tail gas treatment requirement can be met.
According to the method for saving the precious metal consumption of the three-way catalyst, when an engine is in a preset working condition, the current aging coefficient of the three-way catalyst is evaluated, the minimum required temperature corresponding to the current aging coefficient of the three-way catalyst is obtained, the temperature of tail gas entering the three-way catalyst can reach the minimum required temperature of the aged three-way catalyst through heating of the heating assembly, the conversion efficiency and the durability of the three-way catalyst are guaranteed, the precious metal consumption can be prevented from being increased, and the cost can be effectively reduced.
The embodiment also provides an exhaust gas treatment system which is characterized by being used for implementing the method for saving the precious metal consumption of the three-way catalyst in the scheme. The tail gas treatment system comprises a tail gas pipeline connected with the engine, a three-way catalyst and a heating assembly which are arranged on the tail gas pipeline, and a controller. Among them, the engine is preferably a natural gas engine.
The embodiment also provides a vehicle, which comprises the exhaust gas treatment system in the scheme.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (8)
1. A method for saving the consumption of noble metal of a three-way catalyst is characterized in that:
determining that the engine is in a preset working condition;
acquiring an aging coefficient of the three-way catalyst;
determining the lowest required temperature of normal operation of the three-way catalyst based on the aging coefficient according to the aging coefficient of the three-way catalyst and a relation curve between the aging coefficient of the three-way catalyst and the lowest required temperature of normal operation of the three-way catalyst;
acquiring and judging the inlet temperature of the three-way catalyst and the minimum required temperature;
if the inlet temperature of the three-way catalyst is less than the minimum required temperature; controlling the heating component to work so as to raise the temperature of the tail gas entering the three-way catalyst to reach the minimum required temperature;
the determining that the engine is in the preset operating condition comprises:
acquiring an ambient temperature T1, acquiring the rotating speed R of an engine, acquiring the intake pressure P of the engine, acquiring the torque request M of the engine, and acquiring the inlet temperature T2 of a three-way catalyst;
if the intake pressure P is greater than the preset pressure P1, the T1 is less than the first preset temperature T11, the R is greater than the preset rotating speed R1, and the T2 is less than the second preset temperature T12, the engine is judged to be in a preset working condition; or,
if the torque request is greater than a preset torque M1, T1 is less than a first preset temperature T11, R is greater than a preset rotating speed R1, and T2 is less than a second preset temperature T12, the engine is judged to be in a preset working condition;
the acquiring of the aging factor of the three-way catalyst includes:
acquiring parameters capable of causing the three-way catalyst to age, and acquiring an aging coefficient of the three-way catalyst based on the parameters according to the parameters and a relation curve of the parameters and the aging coefficient.
2. The method for saving noble metal dosage of a three-way catalyst according to claim 1, wherein the parameter is oxygen storage amount of the three-way catalyst.
3. The method for saving the consumption of the noble metal of the three-way catalyst according to claim 1, wherein the parameter is the accumulated running time of the engine, the accumulated exhaust temperature integral of the engine, the accumulated total mileage of the engine or the accumulated total oil consumption of the engine.
4. The method for saving noble metal dosage for a three-way catalyst according to claim 1, characterized in that the method is stopped if the inlet temperature of the three-way catalyst is greater than or equal to the minimum required temperature.
5. The method of saving precious metal from a three-way catalyst according to claim 1, wherein controlling the heating assembly to operate to raise the temperature of exhaust entering the three-way catalyst to the minimum required temperature comprises:
s1: acquiring a temperature parameter of the three-way catalyst;
if the temperature parameter is greater than or equal to the preset temperature parameter, executing S2;
s2: controlling the heating assembly to stop working, and returning to S1;
if the temperature parameter is less than the preset temperature parameter, executing S3;
s3: the heating assembly is controlled to operate, and returns to S1.
6. The method for saving noble metal dosage of a three-way catalyst according to claim 5, wherein the temperature parameter comprises any one of an inlet temperature, an outlet temperature, a rate of change of the inlet temperature and a rate of change of the outlet temperature of the three-way catalyst.
7. An exhaust gas treatment system for implementing the method for saving noble metal content of a three-way catalyst according to any one of claims 1 to 6, the exhaust gas treatment system comprising an exhaust gas pipeline connected with an engine, the three-way catalyst and a heating assembly arranged on the exhaust gas pipeline, and a controller.
8. A vehicle comprising the exhaust gas treatment system of claim 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011110648.6A CN112267929B (en) | 2020-10-16 | 2020-10-16 | Method for saving precious metal consumption of three-way catalyst, tail gas treatment system and vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011110648.6A CN112267929B (en) | 2020-10-16 | 2020-10-16 | Method for saving precious metal consumption of three-way catalyst, tail gas treatment system and vehicle |
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