When the throttle is increased, the engine speed will increase. How is this achieved?

Throttle control throttle. It's a switch that blocks the intake of the engine. When you step on the accelerator, you just need to turn up the valve. The piston movement of the engine sucks in air, and the bigger the impact, the more air it sucks in. The mixture of fuel and air and more natural combustion products entering the air chamber will increase, just like putting wood into a stove.