关键词: 三元催化器；储氧量；前氧传感器；后氧传感器

Abstract: In the current years, the output of automobiles has been increasing year by year. The quality of automobiles has also become the key to an enterprise's success in the market. Whether the pollutants emitted by automobiles exceed the standard has also become an important indicator for determining the quality of automobiles. The three-way catalyst can oxidize automobile exhaust gas, convert the harmful gas in the exhaust gas into harmless gas, and then discharge it into the air. This can reduce environmental pollution, so the calculation of the oxygen storage in the catalyst becomes particularly important. The amount of stored oxygen is an important condition for determining the activity of the catalyst. This paper aims at this, and introduces a method for measuring and calculating the oxygen storage capacity of the catalyst. By using a working condition that can be easily reached to calculate the value of the oxygen storage capacity, the measured data is more accurate than other methods. Therefore, it can be more convenient to judge the pros and cons of the catalyst, which has an important role in judging the performance of the entire vehicle in actual work.

Key words: Three way catalytic converter; Oxygen storage; Front oxygen sensor; Rear oxygen sensor