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What is the logic behind automatic transmission gear shifting?

2 Answers

NovaLynn

07/28/25 11:27pm

Automatic transmission will shift gears up or down based on vehicle speed by accelerating or braking. Upshifting: First press the accelerator to increase speed, then fully depress the clutch while releasing the accelerator to shift to a higher gear. P—Parking: Parking gear, starting position. When the vehicle is parked and not in use, the gear is in this position, where the wheels are mechanically locked to prevent rolling. R—Reverse: Reverse gear. Used when backing up. N—Neutral: Neutral gear. Used when temporarily stopping (e.g., at a red light). Note that this gear indicates neutral; to prevent the vehicle from rolling on a slope, always keep the brake pedal depressed. D—Drive: Drive gear, also known as the driving gear. As the name suggests, this gear is used when moving forward. L—Low: Low gear. When going downhill or descending a long slope, placing the gear in this position limits the car to the lowest gear (equivalent to first gear in a manual transmission), allowing the engine to assist in braking. This prevents the danger of brake overheating from prolonged braking by the driver.

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LaCora

08/12/25 3:49am

After driving an automatic transmission car for a long time, I've found the throttle logic to be quite intelligent. When I press the accelerator deeply, the system understands I want to accelerate and delays upshifting or actively downshifts to increase torque, making the drive feel powerful and responsive. With light throttle input, it upshifts earlier to ensure smoothness and fuel efficiency, especially in traffic jams, reducing fatigue in my foot. When coasting by releasing the throttle, it may automatically downshift to prepare for deceleration, saving brake pads. This logic is controlled by the ECU, integrating factors like vehicle speed, engine RPM, and driving style. Over time, it adapts to my habits—for example, becoming more responsive if I frequently drive on highways. Related aspects include different driving modes affecting this logic: ECO mode upshifts quickly for fuel savings, while SPORT mode delays upshifting for more excitement. Maintaining the transmission well ensures this logic reduces jerks, extends lifespan, and makes daily driving more reassuring.

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