SUCTION DEVICE OF ENGINE WITH SUPERCHARGER

摘要

PURPOSE:To prevent a back-flow of a compressed gas in a combustion chamber into an auxiliary suction system at the initial stage within a supercharging range by providing a controller which controls the auxiliary suction valve such that its lift may be increased according to the increase of a load within said range. CONSTITUTION:In addition to a main suction system 2, an auxiliary suction system 5 is provided and a supercharger 8 is incorporated therein. A controller 31 detects a supercharged pressure in an auxiliary suction passage 19 and adjusts a timing cam 17 on the basis of the detection for controlling a lift of an auxiliary suction valve 16 to be increased according to the increase of a load in the supercharging range. The controlling that the lift of the auxiliary suction valve 16 is reduced at the initial stage within said range where a supercharged pressure is low may prevent a compressed gas in a combustion chamber from being blown back into the auxiliary suction passage 19.