CN-115931364-B - Manufacturing method of aging catalyst based on engine bench

CN115931364BCN 115931364 BCN115931364 BCN 115931364BCN-115931364-B

Abstract

The invention provides a manufacturing method of an aging catalyst based on an engine bench, which comprises the steps of 1, carrying out a state test and an aging test on a new catalyst on the engine bench, 2, comparing whether the state of test parameters in the step 1 meets the requirement, if not, returning to the step 1 for carrying out the aging test, if yes, carrying out an emission test on a vehicle, and 3, if not, returning to the step 1 for continuing the aging test, and if yes, ending the test, wherein the state test comprises a combination or any one of an oxygen storage test in a catalyst ignition stage, an emission test in a catalyst ignition stage and an oxygen storage test in a catalyst thermal state. The manufacturing method of the invention ensures that the engine integrally runs in an enrichment state, the combustion of the engine is more stable, the aging time is shortened, and more mixed gas is mixed and combusted at the front part of the catalyst in the process of working condition change, thereby controlling the aging degree in the catalyst carrier and leading the catalyst carrier to be closer to the real situation.

Inventors

ZHOU XIE
REN JIANG
DUAN CHUANKAI
ZHOU FENG
YE MING
LIANG XUN
CHEN JUN
WU XIAODONG
DAI JIANFEI
CHENG YAN
SONG JUN
GUAN YIFENG

Assignees

上汽大众汽车有限公司

Dates

Publication Date: 20260505
Application Date: 20221222

Claims (7)

1. The manufacturing method of the aging catalyst based on the engine bench is characterized by comprising the following steps of: step 1, performing a state test and an aging test on a new catalyst on an engine bench; Step 2, comparing whether the test parameter state in the step 1 meets the requirement, if not, returning to the step 1 for performing an aging test, and if so, installing the test device on a vehicle for performing an emission test; step3, if the emission test result does not meet the requirement, returning to the step 1 to continue the aging test, and if the emission test result meets the end test; wherein the condition test comprises a combination of an oxygen storage amount test at a catalyst light-off stage, an emission test at the catalyst light-off stage and an oxygen storage amount test at a catalyst thermal state, and the method of the condition test comprises the following steps: step 11, selecting a bypass passage of an exhaust system; Step 12, starting the engine and warming up; step 13, adjusting the rotation speed and load of the engine to reach a specified working condition, and maintaining the working condition for a certain time to stabilize the exhaust flow and the exhaust temperature of the engine; Step 14, selecting a main channel of the exhaust system to diagnose the engine; when the method is applied to manufacturing a cloned catalyst from a real aged catalyst, wherein the step 1 includes performing a state test on the real aged catalyst on an engine bench as a reference, performing a state test on the cloned catalyst, and performing an aging test on the cloned catalyst; The step 2 includes comparing the state test results of the cloned catalyst and the real aging catalyst in the step 1, when the positive-negative deviation between the state of the cloned catalyst and the state of the real aging catalyst is 0-10%, loading the cloned catalyst to a vehicle, otherwise, returning to the step 1 to continue the aging test; And step3, when the positive and negative deviation between the emission result of the vehicle with the cloned catalyst and the emission result of the vehicle with the real aging catalyst is 0-10%, the test is completed, otherwise, the step 1 is returned to continue the aging test.
2. The method for manufacturing an engine-rack-based aging catalyst according to claim 1, wherein when the method is applied to manufacturing an extreme catalyst, The step 1 comprises the steps of performing a state test on the limit catalyst on the engine bench, and then performing a state test after an aging test; The step 2 includes comparing a state test result of the limit catalyst with a project experience value, if the positive and negative deviation between the state of the limit catalyst and the experience value is 0-10%, mounting the limit catalyst to a vehicle, otherwise, returning to the ageing test of the step 1, and then performing a state test; Wherein said step 3 comprises, when the emission results of a vehicle equipped with said limit catalyst meet the requirement that "the OBD system should detect a catalyst failure before the reduction of the catalyst conversion capability such that the nmhc+nox emission of the vehicle exceeds the OBD threshold", completing the test, otherwise returning to said step 1 to continue said ageing test.
3. The method for manufacturing an aging catalyst based on an engine bench according to claim 2, wherein the oxygen storage amount test at the light-off stage of the catalyst is included after said step 14, Step 15, when changing the channel of the exhaust system, changing the calibration of engine software, making the engine continuously perform parallel diagnosis, and measuring and recording the oxygen storage value of the catalyst obtained in the period of time; step 16, recovering all engine software calibration; And step 17, reducing the rotation speed and the load of the engine, and finally stopping the engine to finish the test.
4. The engine-stand-based burn-in catalyst manufacturing method according to claim 2, wherein the emissions test of the catalyst light-off phase after said step 14 comprises, Step 15, back blowing of the discharge recording equipment is completed, the measurement initial state is restored, and the equipment is closed; step 16, recovering all engine software calibration; And step 17, reducing the rotation speed and the load of the engine, and finally stopping the engine to finish the test.
5. The method for manufacturing an aging catalyst based on an engine bench according to claim 2, wherein the oxygen storage amount test in the thermal state of the catalyst further comprises, after step 14: step 15, changing the software calibration of the engine to enable the engine to continuously perform parallel diagnosis; Step 16, maintaining the engine speed unchanged, regulating the engine load to slowly rise from the lowest load to the highest load, slowly returning to the lowest load, and measuring and recording the oxygen storage value of the catalyst obtained in the period; and step 17, after the recording is finished, recovering all engine software calibration, reducing the engine speed and load, and finally stopping to finish the test.
6. The method for manufacturing an aging catalyst based on an engine bench according to claim 1, wherein, The combination of the status tests includes a cooling process, which is disposed between the two tests, including normal cooling, or rapid cooling.
7. The method for manufacturing an aging catalyst based on an engine bench according to claim 1, wherein, In the step 12, the engine is started and warmed up to an engine coolant temperature and an engine oil temperature above 85 ℃.

Description

Manufacturing method of aging catalyst based on engine bench Technical Field The invention mainly relates to a manufacturing method of an aging catalyst based on an engine bench. Background According to the requirements of national light automobile pollutant emission limit value and measuring method (Chinese sixth stage) GB 18352.6-2016, the on-service compliance of all vehicles needs to be checked in normal service life, and for this purpose, the main components related to emission, namely a catalyst, are required to be subjected to engine emission calibration and aging diagnosis so as to meet the requirement that the emissions are still within the limit value required by regulations when the vehicles reach the regulated durable mileage. In order to quickly acquire the aging catalyst when the vehicle reaches the durable mileage, so that the aging catalyst is used for the power assembly emission calibration and the national authentication test, a real aging catalyst or a clone catalyst which is related to the catalyst and used for the power assembly emission calibration when the durable mileage is reached needs to be provided, and a limit catalyst is used for the national authentication test. How to quickly obtain a real aging catalyst, a cloning catalyst or a limit catalyst when a vehicle prescribes a durable mileage, so that the real aging catalyst, the cloning catalyst or the limit catalyst can be used for powertrain emission calibration and national authentication tests, three main methods exist: The method comprises the steps of carrying out a whole vehicle aging test on a chassis dynamometer, wherein the test period is long and generally needs about 4-7 months, firing a catalyst by using other heating devices, the conversion efficiency of the fired catalyst is unstable, and carrying out a bench aging test on an engine bench and the SBC test needs about 4 weeks. And the manufacturing time of the limit catalyst for the OBD admission demonstration test is longer. The three methods have the defects that the first method has long test period, the vehicle is required to be arranged for the endurance test, the cost is high, the second method has the defect that the conversion efficiency of the newly manufactured catalyst is unstable, and the third method has the problem that the test period is long and no direct method is used for judging the aging degree. Disclosure of Invention In order to solve the problems, the invention provides a manufacturing method of an aging catalyst based on an engine bench, which is applied to a manufacturing system of the aging catalyst based on the engine bench, wherein the manufacturing system is specially arranged with an exhaust system and comprises an automatic program. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the disclosure. In order to solve the technical problems, the invention provides a manufacturing method of an aging catalyst based on an engine bench, which is characterized by comprising the following steps: step 1, performing a state test and an aging test on a new catalyst on an engine bench; Step 2, comparing whether the test parameter state in the step 1 meets the requirement, if not, returning to the step 1 for performing an aging test, and if so, installing a vehicle for performing an emission test; step3, if the emission test result does not meet the requirement, returning to the step 1 to continue the aging test, and if the emission test result meets the end test; Wherein the state test comprises a combination or any one of an oxygen storage amount test in a catalyst light-off stage, an emission test in the catalyst light-off stage and an oxygen storage amount test in a catalyst thermal state, and the method of the state test comprises the following steps: step 11, selecting a bypass passage of an exhaust system; Step 12, starting the engine and warming up; step 13, adjusting the rotation speed and load of the engine to reach a specified working condition, and maintaining the working condition for a certain time to stabilize the exhaust flow and the exhaust temperature of the engine; And 14, selecting a main channel of the exhaust system to diagnose the engine. Preferably, the present invention further provides a method for manufacturing an aging catalyst based on an engine bench, characterized in that, when the method is applied to manufacturing a cloned catalyst from a real aging catalyst, Wherein the step 1 comprises performing a state test on the real aging catalyst on an engine bench as a reference, performing a state test on the cloned catalyst, and performing an aging test on the cloned catalyst; The step 2 includes comparing the state test results of the cloned catalyst and the real aging catalyst in the step 1, when the positive-negative deviation between the state of the cloned catalyst and the state of th