Method of controlling transmission for reducing clutch abrasion and automatic transmission controlled by method

A method for controlling an automatic transmission of a hybrid vehicle, wherein an independent flow control valve for controlling a flow of fluid and an engine clutch cooling channel for cooling of an engine clutch have been mounted on the automatic transmission, the method comprising:

• a hybrid starter generator (HSG) state determination step of determining, by a controller of the automatic transmission, a state of the HSG;
• a power increase cranking determination step of determining, by the controller of the automatic transmission, when the engine is cranked due to an increase in power required by a driver, in a case that the state of the HSG is a state in which the HSG does not operate in the HSG state determination step;
• a power reduction stop determination step of determining, by the controller of the automatic transmission, when the engine is stopped due to a reduction in power required by the driver, in the case that the state of the HSG is the state in which the HSG does not operate in the HSG state determination step;
• a driving motor cranking execution step of cranking, by the controller of the automatic transmission, an engine using a driving motor in the case that the state of the HSG is the state in which the HSG does not operate in the HSG state determination step;
• a cooling execution step of supplying, by the controller of the automatic transmission, an additional flow of the fluid to the engine clutch cooling channel by controlling the independent flow control valve, wherein the cooling execution step is performed simultaneously with the driving motor cranking execution step.