INTAKE DEVICE OF DIRECT INJECTION TYPE DIESEL ENGINE WITH SUPERCHARGER

摘要

PURPOSE:To prevent intense of swirl from being attenuated and avoid engine power from being reduced by providing swirl variable means, which intensifies the swirl in accordance with increase in supercharging pressure, at a point more downstream than an intake timing valve closed at an earlier timing in response to increase in supercharging pressure. CONSTITUTION:When an engine is kept at a running speed within a low or a middle range, a rotary valve 7 is not closed at an earlier timing so that suction period will be prolonged. And a throttle valve 23 is kept open, on account of which intake gas will flow into a combustion chamber 1a via both helical ports 21 and directional ports 22. When the running speed of the engine is within a high range, supercharging pressure will be increased and act on an actuator 16 so that when the rotary valve 7 is opened, the rotary valve is shifted to advance an ignition timing and closed at an earlier timing. On the other hand, the throttle valve 23 is closed so that intake gas flows into the combustion chamber 1a from a helical port 21 only.