What is the Difference Between Automatic and Semi-Automatic Transmission?

[VanElizabeth]

Automatic and semi-automatic transmissions differ in their modes: automatic transmission only has an automatic mode, while semi-automatic transmission includes both automatic and manual modes. Automatic transmission typically refers to a car's automatic gear-shifting mechanism, where the control system of the automatic transmission selects the appropriate gear based on the engine's speed and load during driving. A standard automatic transmission car has six gear positions, from top to bottom: P (Park), R (Reverse), N (Neutral), D (Drive), S (Sport), and L (Low). The commonly used automatic gear positions are P (Park), R (Reverse), N (Neutral), and D (Drive). Semi-automatic transmission combines manual and automatic gear-shifting methods. This type of transmission allows high-performance sports cars to break free from the constraints of traditional automatic transmissions, enabling drivers to enjoy the fun of manual shifting. These cars have '+' and '-' gear selection options. When in D (Drive) mode, drivers can freely shift down (-) or up (+), similar to a manual transmission.