Is the throttle valve an intake and exhaust valve?

The throttle controls the air intake in front of the intake valve and is connected with the accelerator pedal through a series of levers. The so-called stepping on the accelerator is to control the opening of the throttle, which can control the intake and carburetor intake. Now the electronically controlled injection system is simpler. It can control it by transmitting relevant information to ECU through a series of sensors according to the speed of engine crankshaft, etc ... That's probably it ... Hehe, I want to know more about the book of engine structure. ...