Adaptive Automatic Transmission Control

53OiA, 53OiA Touring, and 540iA (SOP 9/93)

Adaptive transmission control has been developed to more closely match the shifting behavior of the 5-speed automatic transmission to the driver's individual style. The adaptive automatic transmission control (AGS) takes various environmental conditions into consideration (car being driven uphill/ downhill, slippery road surface, etc.) as well as an assessment of the current driving style (aggressive or economical) before signaling a gear change. By evaluation of both the current environmental conditions and driving style the AGS system ensures the appropriate response from the automatic transmission yielding the following advantages:

- fuel consumption is lower if the car is driven calmly and smoothly

- reduction in the number of gearshifts that take place

- maximize traction and stability on slippery surfaces

- improved driver convenience through the reduction of unnecessary driver inputs (automatic program selection).

Fundamental Logic of the Adaptive Transmission Control System

- if the accelerator pedal is depressed rapidly, a downshift normally takes place

- if the accelerator pedal is released suddenly, the present gear is usually retained

- maintaining a constant speed and accelerator pedal position will automatically select an economy shift program after not more than 10 seconds.