EXHAUST BYPASS DEVICE OF TURBO SUPERCHARGED ENGINE

摘要

PROBLEM TO BE SOLVED: To prevent exhaustion interference in the upstream side of a turbine impeller so as to effectively utilize exhaust pulsation by providing first and second bypass passages branching from first and second exhaust passages and connecting the exit of each bypass passage to an exhaust exit passage facing the exhaust port of the turbine impeller. SOLUTION: An exhaust manifold 4 collects the exits of exhaust ports #1 to #3 and #4 to #6. Two rooms 6 and 7 are formed by a partition wall 5 and the rooms 6 and 7 are communicated with first and second scroll rooms inside a turbine house via the exhaust exit ports 6a and 7a. The exhaust manifold 4 includes an exhaust taking out part 25, first and second exhaust taking-out passages 26 and 27 are formed in this part and the passages 26 and 27 are opened/closed by opening/closing valves 29 and 30. During the opening of the opening/closing valves 29 and 30, the exhausts of the rooms 6 and 7 are sent out through first and second bypass piping lines 37 and 38 to the exhaust exit passage 21 and the turbine impeller is bypassed.