METHOD FOR OPTIMIZING ENGINE PERFORMANCE FOR DIFFERENT BLENDS OF FUEL

Engine performance is optimized by storing a plurality of engine strategy maps (A, B, etc.), each such map containing desired engine performance characteristics, and selecting one such map by using fuzzy logic techniques to evaluate selected engine sensor output signals. Preferably, a new engine strategy map is not selected unless (1) additional fuel has been added to the vehicle's fuel tank; and (2) selected sensor output signals have experienced at least a minimum deviation from their nominal values, thus indicating that a different blend of fuel is being supplied to the engine.