Control system for categorized engine conditions

An adaptive control system for categorized engine conditions is disclosed in which the engine conditions to be controlled are discrimated and classified in accordance with the driver's intent ( theta ac, theta br) and the vehicle operating conditions (v, N). It is decided that a given engine control condition (m = 1, 2, 3, 4) is continued or the transition is under way between different control conditions as a history judgement ( l , m, i, n ( l , m)), and a vehicle operation parameter (NIDL, Gf, Ig) is determined in accordance with the determined history (m, l ). At the same time, in accordance with the control condition decided and classified, an operating signal (INJ, IGN) is applied to the engine with an operating parameter thus determined and the result of engine control response is observed to update the adaptive parameter (K( l )).