Satellite Aided Transmission (SAT)

Satellite Aided Transmission (SAT) is a predictive transmission control system in which the vehicle’s location is obtained via satellite and sent to the transmission control unit. This data is combined with detailed map information provided by HERE Technologies, which includes road elevation, curves, and other attributes preloaded into the vehicle’s navigation system. In addition, the system uses inputs from the vehicle speed sensor, which provides current speed, and the throttle position sensor, which reflects the driver’s input.

Based on this combined data, the system predicts the driver’s driving behavior and determines the most appropriate gear. By considering parameters such as road elevation, road curvature, vehicle speed, and throttle input, the vehicle’s computer selects the optimal gear to ensure smooth performance and prevent the engine from struggling for power.

For example, when a driver approaches a corner on an uphill section, the system evaluates throttle input, braking behavior, elevation, curvature, and vehicle location. It then predicts the required gear in advance to provide a seamless driving experience, avoiding jerky shifts and reducing strain on the vehicle.

Unlike conventional gearboxes, this system is proactive—it does not wait for the vehicle to demand power before shifting gears. It also does not require an internet connection.

However, automotive technology has since evolved, and sensor fusion systems are now the standard for predictive transmission control. These systems have largely replaced earlier predictive shifting methods, where gear decisions were influenced by satellite-based data. This earlier approach was known as SAT (Satellite Aided Transmission). These systems have largely replaced earlier predictive shifting methods, where the decision of gear shifts for the vehicle was made on the basis of signals coming from satellites somewhere outside the Earth and hence was known as SAT (Satellite Aided Transmission system).



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