Will an Automatic Transmission Car Move When the Brake is Released Without Pressing the Accelerator?

[DeJesse]

The car will indeed move without pressing the accelerator. This is because automatic transmission vehicles do not have a clutch pedal. When the gear is shifted into a driving position, the clutch is already in a connected state. Without the resistance from the brake, the car will naturally move forward slowly. This convenience is achieved through a special power transmission device in the automatic transmission called the torque converter. Releasing the brake in an automatic transmission vehicle is generally referred to as the automatic transmission's creep function. Regardless of the speed at which you release the brake when starting, the vehicle will not stall. Torque Converter: The torque converter is a mechanism that transmits power through transmission fluid. The engine drives the pump impeller to rotate, which flings the transmission fluid outward. The fluid then impacts the turbine, causing it to rotate. The higher the rotational speed, the more power is transmitted. The turbine is connected to the transmission input shaft, thus transferring power to the drive wheels. When the gear is shifted into 'D' (Drive), the engine rotates the turbine, and the transmission fluid continuously impacts the turbine, allowing the drive wheels to receive this power. At this point, as long as the driving force exceeds the vehicle's resistance, the car will move forward when the brake is released. Since the torque converter continuously transmits power to the transmission whenever the engine is running, power is transmitted as soon as the gear is engaged. AT transmissions and some CVT transmissions use torque converters to transmit engine power, which is why these vehicles start to receive power at the drive wheels once the gear is engaged.