What does automatic transmission mean in a car?

[RileyFitz]

An automatic transmission car generally refers to a vehicle that uses an automatic transmission (AT) to regulate speed. While driving, the control system of the automatic transmission automatically selects the appropriate gear based on the engine's speed and load, replacing the driver's subjective judgment of timing and gear-shifting operations. Below is relevant information about automatic transmission cars: 1. Automatic transmission cars typically use a hydraulic transmission device to replace the mechanical clutch in manual transmission cars, hence there is no clutch pedal. When the engine speed is low, the torque transmitted by the fluid is limited and insufficient to propel the car forward. When the gear lever is placed in the drive position and the brake pedal is released, as the accelerator is pressed and the engine speed increases, the transmitted torque increases, pushing the car forward. 2. In modern automatic transmission cars, the driver only needs to control the accelerator pedal. The computer analyzes signals such as engine throttle opening and vehicle speed collected by sensors, automatically controlling the transmission or shifting the transmission into different gears.