| 摘要 |
PURPOSE:To relax the generation of unevenness in a scavenge pressure by superchargers in the whole range of a load, by operating first the supercharger of small capacity next the supercharger of large capacity last simultaneously the both superchargers successively in accordance with the increase of an engine load. CONSTITUTION:An engine exhausts each exhaust gas from many cylinders 1 to be inducted to a common exhaust receiver 2 thereafter to each exhaust turbine 4 in two sets of superchargers A, B through each valve 3. Then the engine, compressing air to be fed to a scavenge air reservoir 6 through each valve 3' by each compressor 5 rotated by each turbine 4, supplies the compressed air to each cylinder 1 as scavenge air. Here the engine, in accordance with an increase of its operative load, operates first the small capacity supercharger A of displacement ratio 1 for the engine load, for instance, to 33% next the large capacity supercharger B of displacement ratio 2 for the load, for instance, from 33% to 66% last the both superchargers A, B for the load, for instance, in a stage exceeding 66%. |
