In addition to the above control devices, the electronic technologies used in the engine part include: throttle valve timing, secondary air injection, engine boosting, oil and gas evaporation, combustion chamber volume, compression ratio, etc., and have been obtained on some models. application.
Generally speaking, the rotational speed and torque required by the driving wheels of the car are quite different from the rotational speed and torque that the engine can provide. Therefore, the transmission system is required to change the transmission ratio from the engine to the driving wheels, so that the Power is sent to the drive wheels to be able to adapt to changing external loads and road conditions.