CN112577751A - Model selection method of automobile exhaust three-way catalyst - Google Patents
Model selection method of automobile exhaust three-way catalyst Download PDFInfo
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Abstract
The invention discloses a model selection method of an automobile exhaust three-way catalyst, which comprises the following steps: 1) respectively preparing three-way catalyst sample pieces according to the content of noble metal uniformly specified by a host factory and a plurality of different coating formulas correspondingly provided by suppliers; 2) judging a sample piece with optimal comprehensive performance; 3) selecting the coating formula corresponding to the sample piece with the optimal comprehensive performance in the step 2) as an optimal coating formula: 4) respectively preparing a three-way catalyst sample piece according to the optimal coating formula and a plurality of gradient precious metal contents correspondingly provided by a supplier; 5) repeating the step 2); 6) selecting the target sample with the optimal comprehensive performance in the step 5). According to the invention, the scheme of determining the coating in advance through the work of the engine rack is adopted, the sample pieces with different noble metal gradients are prepared, and the noble metal content is selected and determined on the engine rack, so that the model selection period of the three-way catalyst on the whole vehicle is compressed, the whole vehicle volume production time can be advanced, and the time can be predicted to be advanced by 6 months.
Description
Technical Field
The invention relates to an automobile, in particular to a model selection method of an automobile exhaust three-way catalyst.
Background
The automobile emission performance is one of the key performance indexes of the whole automobile, and the emission performance is mainly related to automobile exhaust and is a national environmental protection mandatory requirement.
The three-way catalyst is the most central component for treating the automobile exhaust, and mainly comprises the following components: carrier, coating, noble metal. The production process mainly comprises the steps of uniformly distributing precious metals (platinum, rhodium and palladium) into coating slurry, and then coating the slurry on the surface of a carrier, wherein the coated carrier is called a three-way catalyst.
Three-way catalyst suppliers all have corresponding coating formulas, and different coating technologies of the same supplier are different in formula and are mainly distinguished by coating codes. The model selection development of the three-way catalyst mainly determines the coating technology and the content of noble metal, and the size selection of the carrier is mainly related to the arrangement of the whole vehicle.
At present, the model selection development test of the three-way catalyst is mainly characterized in that a three-way catalyst supplier formulates a corresponding scheme and prepares a sample according to original emission data of the whole vehicle, a host factory performs an emission test on the whole vehicle on a laboratory rotary drum after receiving the sample, selects the sample meeting the requirements, and determines the final technical scheme of the three-way catalyst. The existing model selection method has the following defects:
1. the method needs to be carried out on the whole vehicle, so that the model selection of the three-way catalyst can be started after a test vehicle of the whole vehicle is trial-produced in a development plan of the whole vehicle, and the whole vehicle production time is influenced by the model selection period of the three-way catalyst. Because the model selection period of the three-way catalyst is longer, the mass production time is later, and if the model selection period of the three-way catalyst can be compressed, the whole vehicle mass production time can be advanced;
2. both the coating and precious metal content are uncertain, but each three-way catalyst supplier typically provides samples for only two solutions, including both the coating and precious metal variables, among the limited solutions, and the supplier-provided samples do not necessarily contain the optimal solution, thus resulting in a final determined solution that is not necessarily the optimal solution.
Therefore, a model selection method of the automobile exhaust three-way catalyst, which has simple steps, is carried out on an engine bench and can compress the model selection period of the whole automobile, needs to be developed.
Disclosure of Invention
The invention aims to solve the defects of the background technology and provide a model selection method of an automobile exhaust three-way catalyst, which has simple steps, can be carried out on an engine rack and can compress the model selection period of the whole automobile.
The technical scheme of the invention is as follows: the model selection method of the automobile exhaust three-way catalyst is characterized by comprising the following steps of:
1) respectively preparing three-way catalyst sample pieces according to the content of noble metal uniformly specified by a host factory and a plurality of different coating formulas correspondingly provided by suppliers;
2) sample piece for judging optimal comprehensive performance
Mounting each three-way catalyst sample piece on an engine rack for tail gas emission test and converting the test result to obtain the emission mass M per kilometer corresponding to pollutants THC, NOX and COTHC、MNOX、MCOSelecting MTHC、MNOX、MCOCarrying out a light-off characteristic test and a conversion efficiency test on the three-way catalyst sample pieces which meet the emission standard to respectively obtain comprehensive light-off time T and comprehensive conversion efficiency N;
processing and judging the three-way catalyst sample piece meeting the emission standard according to the comprehensive ignition time T and the comprehensive conversion efficiency N to obtain a three-way catalyst sample piece with optimal comprehensive performance;
3) selecting the coating formula corresponding to the three-way catalyst sample piece with the optimal comprehensive performance in the step 2) as the optimal coating formula:
4) respectively preparing a three-way catalyst sample piece according to the optimal coating formula and a plurality of gradient precious metal contents correspondingly provided by a supplier;
5) repeating the step 2);
6) selecting the three-way catalyst sample piece with the optimal comprehensive performance in the step 5) as a target sample piece, wherein the corresponding noble metal content is the optimal noble metal content.
Preferably, the step 2) of processing and judging the three-way catalyst sample meeting the emission standard according to the comprehensive ignition time T and the comprehensive conversion efficiency N comprises the following steps:
and sequentially arranging the comprehensive ignition time T and the comprehensive conversion efficiency N from inferior to superior, continuously scoring positive integers from 1, adding the two test scores of each three-way catalyst sample to obtain a comprehensive fraction F, and selecting the three-way catalyst sample with the highest comprehensive fraction F as the three-way catalyst sample with the optimal comprehensive performance.
Further, if only one of the three-way catalyst samples with the highest comprehensive fraction F is available, the corresponding three-way catalyst sample is directly used as the three-way catalyst sample with the optimal comprehensive performance;
and if the number of the users with the highest comprehensive scores F is more than that of the users with the highest comprehensive scores F, comparing the costs of the three-way catalyst sample pieces of the users with the highest comprehensive scores F, and taking the user with the lowest cost as the three-way catalyst sample piece with the optimal comprehensive performance.
Preferably, the step 2) of performing the light-off characteristic test to obtain the comprehensive light-off time T includes the following steps:
installing each three-way catalyst sample to an engine rack to operate according to a preset working condition, and calculating the time T for the concentration of each pollutant THC, NOX and CO in the downstream tail gas of the three-way catalyst sample to correspondingly reduce to the concentration of the upstream tail gas 1/2THC、TNOX、TCOWill TTHC、TNOX、TCOAnd taking the average value to obtain the comprehensive ignition time T of the three-way catalyst sample.
Further, the preset working conditions in the ignition characteristic test are as follows:
starting the engine until the idling speed is reached;
keeping idle running for 12 s;
uniformly accelerating to 2000r/min from idle speed for 10 s;
the rotation speed is kept at 2000r/min for 24 s;
the operation is kept at the idle speed after the uniform deceleration from 2000r/min to the idle speed for 10 s.
Preferably, the step 2) of performing the conversion efficiency test to obtain the comprehensive conversion efficiency N includes the following steps:
the engine speed stably operates at 3000rpm, the average effective pressure is controlled at 20bar, the air-fuel ratio of the engine is adjusted according to the operation of a preset working condition, the concentrations of pollutants THC, NOX and CO at the upstream and downstream of a three-way catalyst sample piece under the condition of the air-fuel ratio of each engine are measured, and the corresponding conversion efficiency N is calculatedTHC、NNOX、NCOAnd averaging the conversion efficiencies of all pollutants under all air-fuel ratio conditions of the engine to obtain the comprehensive conversion efficiency N of the three-way catalyst sample.
Further, the preset working conditions in the conversion efficiency test include:
the preset working conditions in the conversion efficiency test comprise:
firstly, operating for 60s according to the air-fuel ratio of 14.6, then operating for 10s according to the air-fuel ratio of 14.4, and operating for 10s according to the air-fuel ratio of 14.8 for 4 cycles alternately;
then, the air-fuel ratio is operated for 60s according to 14.6, then the air-fuel ratio is operated for 10s for 14.1, and the air-fuel ratio is operated for 10s for 15.1, and the operation is carried out for 4 cycles alternately;
finally, the air-fuel ratio is operated for 60s at 14.6, then the air-fuel ratio is operated for 10s at 13.6, and the air-fuel ratio is operated for 10s at 15.6, and the operation is carried out for 4 cycles alternately.
Further, conversion efficiency NTHC、NNOX、NCOThe concentration of the pollutants THC, NOX and CO in the upstream and downstream of the three-way catalyst sample is calculated according to the percentage of the difference in the upstream concentration.
Further, the conversion of the tail gas emission test and the test result in the step 2) comprises the following steps:
installing a three-way catalyst sample on an engine dynamic bench to run according to a preset automobile test cycle, and acquiring the instantaneous exhaust mass flow q of the tail gas and the pollutant concentration C corresponding to each pollutant in the tail gas in real time within the time from a to bTHC、CNOX、CCOThe conversion is carried out according to the formula I,
mi-emission mass of pollutant i in g/km, i is THC or NOX or CO, Ci-concentration of pollutant i in exhaust gas in ppm, i is THC or NOX or CO,
ρ i-the density of contaminant i at standard temperature and pressure, in g/L, i being THC or NOx or CO,
ρ -the density of air at standard temperature and pressure, in g/L,
d-the actual distance travelled for the test cycle, in km,
q is the instantaneous exhaust mass flow rate, with the unit being g/s,
a, collecting the initial time of tail gas, the unit is s,
b, tail gas collection ending time, wherein the unit is s.
Preferably, the preset vehicle test cycle in the exhaust emission test is a light vehicle test cycle in GB18352.6-2016 standard.
The invention has the beneficial effects that:
1. the model selection development of the three-way catalyst scheme is carried out on the engine rack, compared with the traditional model selection method, the model selection test of the three-way catalyst can be carried out only after the whole vehicle is trial-manufactured, the model selection work of the three-way catalyst is started in advance, the scheme of the coating is determined in advance through the work of the engine rack, samples with different precious metal gradients are prepared, and the selection determination of the precious metal content is carried out on the engine rack, so that the model selection period of the three-way catalyst on the whole vehicle is compressed, the whole vehicle production time can be advanced, and the time of 6 months can be predicted.
2. The method comprises the steps of selecting a coating on an engine rack, having sufficient time to carry out performance verification of the coating, selecting a coating technology which is most matched with an engine through comparison tests of ignition performance, conversion efficiency and tail gas comprehensive treatment capacity, selecting a variable of the content of the noble metal after the coating technology is determined, making sample pieces with different noble metal gradients for testing, and selecting a scheme which meets the requirements of regulations and has the optimal cost.
3. In the tail gas emission, the pollutant concentration can be converted into a g/km result through a formula in the method, the g/km result is directly compared with the national regulation limit value, and whether the technical scheme of the three-way catalyst can meet the regulation requirement or not is judged in advance.
Drawings
FIG. 1 is a schematic diagram of the preset conditions of the ignition characteristic test
FIG. 2 is a schematic diagram of the predetermined conditions of the conversion efficiency test
FIG. 3 is a schematic diagram of the results of the exhaust emission test
Detailed Description
The following specific examples further illustrate the invention in detail.
The invention provides a model selection method of an automobile exhaust three-way catalyst, which comprises the following steps:
1) respectively preparing three-way catalyst sample pieces according to the content of noble metal uniformly specified by a host factory and a plurality of different coating formulas correspondingly provided by suppliers;
2) sample piece for judging optimal comprehensive performance
2.1) exhaust emission test
Mounting each three-way catalyst sample piece on an engine rack for tail gas emission test and converting the test result to obtain the emission mass M per kilometer corresponding to pollutants THC, NOX and COTHC、MNOX、MCOThe method comprises the following specific steps:
installing a three-way catalyst sample on an engine dynamic bench according to a preset automobile test cycleRunning a loop (a light vehicle test cycle in GB18352.6-2016 standard, WLTC cycle for short), and collecting the instantaneous exhaust mass flow q of the tail gas and the pollutant concentration C corresponding to each pollutant in the tail gas in real time within the time from a to bTHC、CNOX、CCOThe data are shown in FIG. 3 (lower curve C)THCThe instantaneous curve, the upper curve is the WLTC cycle instantaneous speed), is converted according to the formula I,
mi-emission mass of pollutant i in g/km, i is THC or NOX or CO, Ci-concentration of pollutant i in exhaust gas in ppm, i is THC or NOX or CO,
ρ i-the density of contaminant i at standard temperature and pressure, in g/L, i being THC or NOx or CO,
ρ -the density of air at standard temperature and pressure, in g/L,
d-the actual distance travelled for the test cycle, in km,
q is the instantaneous exhaust mass flow rate, with the unit being g/s,
a-start time of tail gas collection (WLTC cycle start time) in units of s,
b-end time of tail gas collection (WLTC cycle end time), in units of s,
the WLTC cycles for 1800s in this embodiment.
2.2) test of ignition characteristics
Selection of MTHC、MNOX、MCOCarrying out ignition characteristic test on three-way catalyst samples which both meet the emission standard GB18352.6-2016 light automobile pollutant emission limit value and a measurement method (the sixth stage in China) to obtain respective comprehensive ignition time T, and specifically comprising the following steps:
installing each three-way catalyst sample to an engine rack to operate according to a preset working condition, and calculating the time T for the concentration of each pollutant THC, NOX and CO in the downstream tail gas of the three-way catalyst sample to correspondingly reduce to the concentration of the upstream tail gas 1/2THC、TNOX、TCOWill TTHC、TNOX、TCOAnd taking the average value to obtain the comprehensive ignition time T of the three-way catalyst sample.
The preset working conditions in the ignition characteristic test are the operating conditions 1-5 which are sequentially operated in the figure 1:
the operation working condition 1: after the engine is kept stand for at least 6 hours, the engine is started uniformly until the idling speed is reached;
the operation working condition 2: keeping idle running for 12 s;
operating condition 3: uniformly accelerating to 2000r/min from idle speed for 10 s;
the operation condition 4 is as follows: the running speed is kept at 2000r/min for 24s, and the exhaust heat end component local cooling fan is in a 'closed' state from the starting of the engine to the moment;
the operation condition is 5: and turning on the exhaust heat end component local cooling fan, uniformly decelerating from 2000r/min to idling for 10s, and keeping running at the idling speed.
2.3) measurement of conversion efficiency
Selection of MTHC、MNOX、MCOAnd then carrying out conversion efficiency test on the three-way catalyst sample pieces which all meet the six national emission standards to obtain respective comprehensive conversion efficiency N, wherein the method comprises the following specific steps:
the engine speed stably runs at 3000rpm, the average effective pressure is controlled at 20bar, the air-fuel ratio of the engine is adjusted according to the operation of a preset working condition, the concentrations of pollutants THC, NOX and CO at the upstream and downstream of a three-way catalyst sample piece under the condition of the air-fuel ratio of each engine are measured, and the conversion efficiency N of each pollutant is calculated by calculating the percentage of the difference of the concentrations of the pollutants THC, NOX and CO at the upstream and downstream of the three-way catalyst sample piece to the upstream concentrationTHC、NNOX、NCOAnd averaging the conversion efficiencies of all pollutants under all air-fuel ratio conditions of the engine to obtain the comprehensive conversion efficiency N of the three-way catalyst sample.
The preset working conditions in the conversion efficiency test are the operating conditions 1-3 which are sequentially operated in the figure 2:
the operation working condition 1: firstly, operating for 60s according to the air-fuel ratio of 14.6, then operating for 10s according to the air-fuel ratio of 14.4, and operating for 10s according to the air-fuel ratio of 14.8 for 4 cycles alternately;
then, the air-fuel ratio is operated for 60s according to 14.6, then the air-fuel ratio is operated for 10s for 14.1, and the air-fuel ratio is operated for 10s for 15.1, and the operation is carried out for 4 cycles alternately;
operating condition 3: and finally, operating for 60s according to the air-fuel ratio of 14.6, operating for 10s according to the air-fuel ratio of 13.6, and operating for 10s according to the air-fuel ratio of 15.6, and alternately operating for 4 cycles to finish the operation.
In the above working conditions: the stages of 14.6 air-fuel ratios, 14.4 air-fuel ratios and 14.8 air-fuel ratios of 4 in the operation condition 1 respectively need to calculate the conversion efficiency NTHC、NNOX、NCO(ii) a The stages of 14.6 air-fuel ratios, 14.1 air-fuel ratios and 15.1 air-fuel ratios of 4 in the operating condition 2 need to respectively calculate the conversion efficiency NTHC、NNOX、NCO(ii) a The air-fuel ratio 14.6, the air-fuel ratio 4 13.6 and the air-fuel ratio 4 15.6 in the operation condition 3 need to be respectively calculated to obtain the conversion efficiency NTHC、NNOX、NCO. Can be controlled by all N in the preset working conditionTHCTaking the mean value NTHC', all of NNOXTaking the mean value NNOX', all of NCOTaking the mean value NCO', then NTHC’、NNOX’、NCO' average value is taken to obtain the comprehensive conversion efficiency N.
2.4) determination of the comprehensive Properties
The method for processing and judging the three-way catalyst sample piece meeting the emission standard according to the comprehensive ignition time T and the comprehensive conversion efficiency N comprises the following steps:
and sequentially arranging the comprehensive ignition time T and the comprehensive conversion efficiency N from inferior to superior, continuously scoring positive integers from 1, adding the scores of two tests (the comprehensive ignition time T and the comprehensive conversion efficiency N) of each three-way catalyst sample to obtain a comprehensive fraction F, and selecting the three-way catalyst sample with the highest comprehensive fraction F as the three-way catalyst sample with the optimal comprehensive performance.
If only one of the three-way catalyst sample pieces with the highest comprehensive fraction F is available, the corresponding three-way catalyst sample piece is directly used as the three-way catalyst sample piece with the optimal comprehensive performance;
and if the number of the users with the highest comprehensive scores F is more than that of the users with the highest comprehensive scores F, comparing the costs of the three-way catalyst sample pieces of the users with the highest comprehensive scores F, and taking the user with the lowest cost as the three-way catalyst sample piece with the optimal comprehensive performance.
3) Selecting the coating formula corresponding to the three-way catalyst sample piece with the optimal comprehensive performance in the step 2) as the optimal coating formula:
4) respectively preparing a three-way catalyst sample piece according to the optimal coating formula and a plurality of gradient precious metal contents correspondingly provided by a supplier;
5) repeating the step 2);
6) selecting the three-way catalyst sample piece with the optimal comprehensive performance in the step 5) as a target sample piece, wherein the corresponding noble metal content is the optimal noble metal content.
Claims (10)
1. The model selection method of the automobile exhaust three-way catalyst is characterized by comprising the following steps of:
1) respectively preparing three-way catalyst sample pieces according to the content of noble metal uniformly specified by a host factory and a plurality of different coating formulas correspondingly provided by suppliers;
2) sample piece for judging optimal comprehensive performance
Mounting each three-way catalyst sample piece on an engine rack for tail gas emission test and converting the test result to obtain the emission mass M per kilometer corresponding to pollutants THC, NOX and COTHC、MNOX、MCOSelecting MTHC、MNOX、MCOCarrying out a light-off characteristic test and a conversion efficiency test on the three-way catalyst sample pieces which meet the emission standard to respectively obtain comprehensive light-off time T and comprehensive conversion efficiency N;
processing and judging the three-way catalyst sample piece meeting the emission standard according to the comprehensive ignition time T and the comprehensive conversion efficiency N to obtain a three-way catalyst sample piece with optimal comprehensive performance;
3) selecting the coating formula corresponding to the three-way catalyst sample piece with the optimal comprehensive performance in the step 2) as the optimal coating formula:
4) respectively preparing a three-way catalyst sample piece according to the optimal coating formula and a plurality of gradient precious metal contents correspondingly provided by a supplier;
5) repeating the step 2);
6) selecting the three-way catalyst sample piece with the optimal comprehensive performance in the step 5) as a target sample piece, wherein the corresponding noble metal content is the optimal noble metal content.
2. The model selection method of the automobile exhaust three-way catalyst according to claim 1, wherein the step 2) of processing and judging the three-way catalyst sample meeting the emission standard according to the comprehensive ignition time T and the comprehensive conversion efficiency N comprises the following steps:
and sequentially arranging the comprehensive ignition time T and the comprehensive conversion efficiency N from inferior to superior, continuously scoring positive integers from 1, adding the two test scores of each three-way catalyst sample to obtain a comprehensive fraction F, and selecting the three-way catalyst sample with the highest comprehensive fraction F as the three-way catalyst sample with the optimal comprehensive performance.
3. The model selection method of the automobile exhaust three-way catalyst according to claim 2, characterized in that if only one of the three-way catalyst samples with the highest comprehensive fraction F is available, the corresponding three-way catalyst sample is directly used as the three-way catalyst sample with the optimal comprehensive performance;
and if the number of the users with the highest comprehensive scores F is more than that of the users with the highest comprehensive scores F, comparing the costs of the three-way catalyst sample pieces of the users with the highest comprehensive scores F, and taking the user with the lowest cost as the three-way catalyst sample piece with the optimal comprehensive performance.
4. The model selection method of the automobile exhaust three-way catalyst according to claim 1, wherein the step 2) of performing the ignition characteristic test to obtain the comprehensive ignition time T comprises the following steps:
installing each three-way catalyst sample to an engine rack to operate according to a preset working condition, and calculating the time T for the concentration of each pollutant THC, NOX and CO in the downstream tail gas of the three-way catalyst sample to correspondingly reduce to the concentration of the upstream tail gas 1/2THC、TNOX、TCOWill TTHC、TNOX、TCOAnd taking the average value to obtain the comprehensive ignition time T of the three-way catalyst sample.
5. The model selection method of the automobile exhaust three-way catalyst according to claim 4, characterized in that the preset working conditions in the ignition characteristic test are as follows:
starting the engine until the idling speed is reached;
keeping idle running for 12 s;
uniformly accelerating to 2000r/min from idle speed for 10 s;
the rotation speed is kept at 2000r/min for 24 s;
the operation is kept at the idle speed after the uniform deceleration from 2000r/min to the idle speed for 10 s.
6. The model selection method of the automobile exhaust three-way catalyst according to claim 1, wherein the conversion efficiency test in the step 2) is performed to obtain the comprehensive conversion efficiency N, and the method comprises the following steps:
the engine speed stably operates at 3000rpm, the average effective pressure is controlled at 20bar, the air-fuel ratio of the engine is adjusted according to the operation of a preset working condition, the concentrations of pollutants THC, NOX and CO at the upstream and downstream of a three-way catalyst sample piece under the condition of the air-fuel ratio of each engine are measured, and the corresponding conversion efficiency N is calculatedTHC、NNOX、NCOAnd averaging the conversion efficiencies of all pollutants under all air-fuel ratio conditions of the engine to obtain the comprehensive conversion efficiency N of the three-way catalyst sample.
7. The model selection method of the automobile exhaust three-way catalyst according to claim 6, wherein the preset working conditions in the conversion efficiency test comprise:
firstly, operating for 60s according to the air-fuel ratio of 14.6, then operating for 10s according to the air-fuel ratio of 14.4, and operating for 10s according to the air-fuel ratio of 14.8 for 4 cycles alternately;
then, the air-fuel ratio is operated for 60s according to 14.6, then the air-fuel ratio is operated for 10s for 14.1, and the air-fuel ratio is operated for 10s for 15.1, and the operation is carried out for 4 cycles alternately;
finally, the air-fuel ratio is operated for 60s at 14.6, then the air-fuel ratio is operated for 10s at 13.6, and the air-fuel ratio is operated for 10s at 15.6, and the operation is carried out for 4 cycles alternately.
8. The method for selecting the type of the three-way catalyst for automobile exhaust according to claim 6, wherein the conversion efficiency N isTHC、NNOX、NCOThe concentration of the pollutants THC, NOX and CO in the upstream and downstream of the three-way catalyst sample is calculated according to the percentage of the difference in the upstream concentration.
9. The model selection method of the automobile exhaust three-way catalyst according to claim 1, wherein the conversion of the exhaust emission test and the test result in the step 2) comprises the following steps:
installing a three-way catalyst sample on an engine dynamic bench to run according to a preset automobile test cycle, and acquiring the instantaneous exhaust mass flow q of the tail gas and the pollutant concentration C corresponding to each pollutant in the tail gas in real time within the time from a to bTHC、CNOX、CCOThe conversion is carried out according to the formula I,
mi-emission mass of pollutant i in g/km, i is THC or NOX or CO,
ci-concentration of pollutant i in the exhaust gas, in ppm, i being THC or NOX or CO,
ρ i-the density of contaminant i at standard temperature and pressure, in g/L, i being THC or NOx or CO,
ρ -the density of air at standard temperature and pressure, in g/L,
d-the actual distance travelled for the test cycle, in km,
q is the instantaneous exhaust mass flow rate, with the unit being g/s,
a, collecting the initial time of tail gas, the unit is s,
b, tail gas collection ending time, wherein the unit is s.
10. The model selection method of the automobile exhaust three-way catalyst according to claim 9, wherein the preset automobile test cycle in the exhaust emission test is a light automobile test cycle in the GB18352.6-2016 standard.
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|---|---|---|---|
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