Abstract: In a vehicle provided with an automatic transmission, gear-shifting shock is suppressed by changing the engine output power in response to a gear-shifting. The change in the engine output power is terminated when the actual engine speed reaches a completion decision engine speed, which is determined so that it corresponds to the time when the gear-shifting is completed, which is based on the fact that the engine speed changes according to a certain characteristic curve during the gear-shifting. The engine speed at which the gear-shifting is actually completed is detected for each gear-shifting according to the change in the rotational speed of the engine during the gear-shifting, and the completion decision rotational speed for each gear-shifting is set through learning on the basis of the preceding engine speed at which the gear shifting was actually completed.

Abstract: A supercharging pressure control system for an automotive engine with a supercharger controlling a pressure of incoming supercharging air into the automotive engine. The pressure of the incoming supercharging air is feedback-controlled so as to reach a target pressure of supercharging air which is determined depending upon engine operating conditions. A feedback control gain is varied higher when the incoming supercharging air pressure is higher than the target supercharging air pressure when compared to being lower than the target supercharging air pressure.