Abstract: An automotive engine has a turbocharger including a turbine, a compressor driven by the turbine, and a wastegate valve provided in a bypass around the turbine, and an actuator for operating the wastegate valve so as to prevent intake pressure from becoming extremely high. The system has an intake pressure sensor for detecting the intake pressure and a throttle position sensor for detecting a throttle position. A basic control value is determined in accordance with driving conditions of the engine, and a feedback control value is calculated in accordance with the difference between the intake pressure detected by the intake pressure sensor and a limit value. When a peak of the intake pressure is detected in the acceleration state of the engine, the basic control value and the feedback control value are combined, and the actuator is driven in accordance with the combined control value.

Abstract: A fuel evaporation quantity is estimated based on engine speed and opening degree of a throttle valve. The quantity of fuel to be injected is provided based on the estimated fuel evaporation quantity. A weight for a weighted mean is changed in accordance with the engine operating condition. A smoothed fuel injection quantity is provided by the weighted mean with the weight.

Abstract: A fuel injection control device is provided for a flexible fuel vehicle alcohol engine to be driven with a mixed fuel consisting of gasoline and alcohol. The engine includes a port injector provided at each cylinder and an intake pipe assembly portion injector commonly provided for all the cylinders. The control device defines such a fuel injection pulse width as enabling the operation of the injector in dependency on the alcohol density and the engine state. It drives only the intake pipe assembly portion injector to inject the fuel if the pulse width is smaller than a predetermined value or adds the fuel injection of the port injector to that if it is larger.