PI control-based roller segmented cooling control method

The invention relates to the technical field of strip steel production, in particular to a roller segmented cooling control method based on PI control, which specifically comprises the following steps: step 1, determining segmented cooling input parameters; secondly, the relation between the cooling liquid spraying variable quantity and the plate type deviation value is established, and the plate type deviation value is converted into the cooling liquid spraying variable quantity of a spray head; 3, limiting the maximum and minimum cooling liquid injection variable quantities; 4, regulating and controlling the cooling liquid spraying variable quantity by using PI control; 5, a manual control and PI automatic control switching program is added, and the basic cooling liquid injection amount and the cooling liquid injection variable quantity controlled by PI or the cooling liquid injection variable quantity controlled by manual control are added to form the cooling liquid injection amount actually output by each