Method and device for testing performance of three-way catalyst, terminal and storage medium

The invention discloses a method for testing the performance of a three-way catalyst. The method comprises the steps: adjusting the rotating speed and accelerator of an engine in real time, so as to control the gas flow at the inlet end of the engine within a preset range; adjusting excess air coefficient of the inlet end of the three-way catalyst to be increased and decreased progressively, and obtaining a post-oxygen voltage value in real time; calculating the oxygen storage time and the oxygen release time of a catalyst in the three-way catalyst according to the change rule of the excess air coefficient and the post-oxygen voltage value; and evaluating the performance of the three-way catalyst according to the oxygen storage time and the oxygen release time. According to the method, theparameter of the post-oxygen voltage value of the three-way catalyst is changed by controlling the excess air coefficient, so that the oxygen storage time and the oxygen release time of the catalystare measured, and the perf