JPS6435017A - Supercharging pressure controller of engine - Google Patents

Abstract

PURPOSE:To obtain always proper supercharging pressure by detecting such situation that a car is running in the condition that a supercharging ability is required to be controlled and by changing the supercharging ability of a supercharger based on the detected value of frequency of the occurrence of such situation per unit time. CONSTITUTION:The mechanical supercharger 6 incorporated in the air-intake system 5 of an engine 4 is structured so as to be of an engine drive type through a supercharging ability changing means 8, whose belt type transmission mechanism 14 for transmitting the torque of a crank shaft 16 to the supercharger 6 is to be of a V belt type stepless speed change mechanism. The pulley ratio is adjusted by controlling a hydraulic oil pressure controller 26 through an operation controlling means 12 and the supply and discharge of pressured oil to and from a hydraulic actuator 24. At this time it is detected by a driving state detecting means 10 that a car is running in the driving state to be controlled the supercharging ability, and frequency of detection per unit time is accumulated. And the supercharging ability changing means 8 is controlled according to the accumulated frequency in the tendency to putting down supercharging ability down.