- 专利标题： Two-Stage Supercharging System for Internal Combustion Engine
- 专利标题（中）： 内燃机二级增压系统
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申请号： US12084877申请日： 2006-09-25
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公开(公告)号： US20090255517A1公开(公告)日： 2009-10-15
- 发明人: Naoya Ishikawa , Junichiro Nitta
- 申请人： Naoya Ishikawa , Junichiro Nitta
- 优先权： JP2005-334343 20051118
- 国际申请： PCT/JP2006/318933 WO 20060925
- 主分类号： F02B33/00
- IPC分类号： F02B33/00 ; F02B33/44
摘要：
A sequential-type, two-stage supercharging system (1) having a high-pressure-stage turbocharger (6) and a low-pressure-stage turbocharger (5), in which high-pressure-stage exhaust gas bypass passages (6d, 6e) for bypassing a high-pressure-stage turbine (6t) is formed by both the first bypass passage (6d) having a small-diameter valve (6f) and the second bypass passage (6e) having a large-diameter valve (6g) with a diameter greater than that of the small-diameter valve (6f). The effective valve area of the small-diameter valve (6f) is set to 9.5%-26.5% of the passage cross-sectional area required when exhaust gas is at its maximum total flow rate. This allows, in medium speed/medium load operation, fine EGR rate control and air-fuel ratio control.