The working principle of the transmission piston: When the car's engine is started, the piston moves up and down in the cylinder, completing the four basic processes of suction, compression, deflagration and exhaust. When the piston moves downward, the pressure in the cylinder decreases, the valve opens, and the piston slowly moves downward from the top of the cylinder, reducing the pressure in the cylinder, and the gasoline and air mixture is sucked into the cylinder. After the suction stroke is completed, the piston begins to move upward, the valve closes, and the gasoline and air mixture in the cylinder is compressed. During this process, the pressure and temperature inside the cylinder increase, making the mixture more susceptible to combustion. When the piston reaches its highest point, the ignition system emits electric sparks to the mixture in the cylinder, igniting combustion of the mixture, producing high-temperature and high-pressure gas, and pushing th…