SUPERCHARGING PRESSURE CONTROLLER FOR ENGINE WITH SUPERCHARGER

摘要

PURPOSE:To prevent a decrease in supercharging pressure caused by an insufficient bleeding quantity at the initial stage of supercharging of an actuator for controlling a supercharging pressure in a high land. CONSTITUTION:In a supercharging pressure controller for an engine with a supercharger, a supercharging air introduced into a diaphragm chamber disposed in a diaphragm actuator 42 is bled to the exterior through a solenoid (fifth solenoid) 32 which is duty-controlled so that an opening degree of a supercharging pressure control valve 41 for bypassing a turbine of the supercharger is regulated, thus controlling a supercharging pressure. An initial duty value of the solenoid 32 for bleeding the supercharging air introduced into the diaphragm actuator 42 is corrected by an initial duty value corrector 61 in such a manner as to become higher as an atmospheric pressure detected by an atmospheric pressure detector 60 becomes lower.