Two-stage supercharging system for internal combustion engine

Details Two-stage supercharging system for internal combustion engine Two-stage supercharging system for internal combustion engine

2006-09-25

2011-10-11

Davis, Mary A (Department: 3748)

Power plants

Fluid motor means driven by waste heat or by exhaust energy...

With supercharging means for engine

C060S612000, C123S562000

Reexamination Certificate

active

08033108

ABSTRACT:
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.

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International Search Report mailed Oct. 17, 2006 in connection with the International application PCT/JP2006/318933.
Extended European Search Report dated Oct. 4, 2010 in Appln. No. 06810501.4.

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