Corrected SCR efficiency model, correction method and vehicle

The invention belongs to the technical field of tail gas aftertreatment, and particularly relates to a corrected SCR efficiency model, a correction method and a vehicle. The correction method comprises the steps that the actual efficiency of an SCR model and the conversion efficiency of different measuring points of a section are calculated; classifying the measuring points according to the deviation between the conversion efficiency of each point and the actual efficiency so as to obtain a plurality of branch models, and sequentially calculating the area proportion and the efficiency correction coefficient of each branch model; correcting the efficiency coefficient of each branch model based on the temperature and the airspeed to form an efficiency correction coefficient map; and calculating the flow rate and conversion efficiency of NOx and ammonia flowing into each branch model based on the area ratio and the efficiency correction factor, and calculating the efficiency of the corrected SCR efficiency model