What is the difference between semi-automatic and fully automatic cars?

[LaFinn]

The main difference between semi-automatic and fully automatic cars is: an automatic transmission means the car shifts gears up and down by itself. In a semi-automatic (AMT), the gears do not change automatically; you must shift up and down manually, but there is no clutch. F1 racing cars are basically this type. Relevant information about the auto-hold function is as follows: 1. Introduction: Auto-hold, also known as AUTO-HOLD, refers to an automatic braking function. After activating this function, for example, when stopping at a red light, you don't need to pull the handbrake, which simplifies the operation by avoiding the use of the handbrake or electronic handbrake. For automatic transmission models, there's no need to frequently switch between D to N or D to P. 2. Working principle: The AUTO-HOLD function provides accurate parking force through a slope sensor controlled by the system. During startup, the parking control unit calculates information provided by the clutch distance sensor, clutch engagement speed sensor, throttle pedal sensor, etc. When the driving force exceeds the running resistance, the parking brake is automatically released, allowing the car to start smoothly.