| 摘要 |
<P>PROBLEM TO BE SOLVED: To restrain deterioration of fuel economy when a plurality of superchargers are provided. <P>SOLUTION: An HP-side exhaust passage 216 provided with an HP-side turbine 218, and an exhaust switch passage 227 provided with an exhaust air switch valve 228 are connected to an exhaust manifold 207 of an engine 200 having two kinds of exhaust air drive type superchargers, an LP-side compressor 213 (second supercharger) and an HP-side compressor 221 (first supercharger), and is converged with it at an exhaust converging part 222. An LP-side turbine 210 is installed to an exhaust passage 208 on a downstream side of the exhaust converging part 222. An ECU 100 normally fetches a target opening degree of the exhaust air switch valve 228 from a supercharging map based on an engine rotation speed NE and a fuel injection amount Q and controls the exhaust air switch valve 228. When variation between an exhaust pressure Pex and a supercharging pressure Pin exceeds a reference value ΔPt, the exhaust air switch valve 228 is opened. <P>COPYRIGHT: (C)2010,JPO&INPIT |
