Method, equipment and device for detecting oxygen storage amount of automobile catalyst, and storage medium

The invention discloses a method, equipment and device for detecting an oxygen storage amount of an automobile catalyst, and a storage medium, and relates to the technical field of vehicle diagnosis.The method comprises the steps of adjusting the concentration of mixed gas in the automobile catalyst; detecting a filtered air mass flow parameter and an excess air coefficient of the automobile catalyst and a voltage value of a rear oxygen sensor in the automobile catalyst in real time while the concentration of the mixed gas is adjusted; when it is detected that a target excess air coefficientmeeting a first preset condition exists, determining a first oxygen storage amount value according to a first filtered air mass flow parameter corresponding to the target excess air coefficient; whenit is detected that a target voltage value meeting a second preset condition exists, determining a second oxygen storage amount value according to a second filtered air mass flow parameter corresponding to the target voltage va