Method for diagnosing, evaluating and testing oxygen storage amount state of three-way catalytic rack of passenger car engine

The invention discloses a method for diagnosing, evaluating and testing the oxygen storage capacity state of a three-way catalytic rack of a passenger car engine, relates to the technical field of automobile engines, and aims to better control the influence of a test sample due to different environments by utilizing more accurate fixed rotating speed, accelerator opening, torque, power, exhaust temperature and environment temperature of the engine rack and adopt ECU (Electronic Control Unit) measurement software to measure the oxygen storage capacity state of the three-way catalytic rack of the passenger car engine. The dynamic numerical value of the oxygen sensor can be measured and recorded by connecting an ECU, the oxygen storage amount is calculated through a formula, the oxygen storage amount numerical value of the catalyst can be read more clearly in any state, the existing states of the catalysts carried by different whole vehicles are compared, and the difference of the catalysts of different whole ve