The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 11, 2011
Filed:
Sep. 25, 2006
Naoya Ishikawa, Fujisawa, JP;
Junichiro Nitta, Fujisawa, JP;
Naoya Ishikawa, Fujisawa, JP;
Junichiro Nitta, Fujisawa, JP;
Isuzu Motors Limited, Tokyo, JP;
Abstract
A sequential-type, two-stage supercharging system () having a high-pressure-stage turbocharger () and a low-pressure-stage turbocharger (), in which high-pressure-stage exhaust gas bypass passages () for bypassing a high-pressure-stage turbine () is formed by both the first bypass passage () having a small-diameter valve () and the second bypass passage () having a large-diameter valve () with a diameter greater than that of the small-diameter valve (). The effective valve area of the small-diameter valve () 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.