Some cars have two cables on the accelerator. What are their functions?

One is the throttle line of the engine, and the throttle pedal pulls the throttle line of the engine to control the opening of the throttle valve, thus controlling the engine speed. The other is the oil valve pipeline of automatic transmission. The accelerator pedal pulls the accelerator line of the engine to control the throttle opening, and then synchronously pulls the oil valve line of the automatic transmission to control the opening of the oil valve inside the transmission, and controls the oil quantity of the automatic transmission oil under pressure entering the oil circuit board of the transmission, so as to synchronously control the upshift or downshift of the automatic transmission according to the engine speed.