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:
Dec. 02, 2003
Filed:
May. 14, 2002
James Joseph Faletti, Spring Valley, IL (US);
Caterpillar Inc, Peoria, IL (US);
Abstract
An airflow system for an engine includes first and second turbines coupled with first and second compressors, respectively. The first turbine receives exhaust from an exhaust manifold, and the first compressor supplies compressed air to an intake manifold. A wastegate valve, fluidly coupled with the exhaust manifold, is movable between a first position allowing exhaust to bypass at least one of the turbines and a second position restricting exhaust from bypassing. A controller restricts the supply of pressurized air to the wastegate valve such that the wastegate is in the second position when at least one of (i) a load of the engine is less than or equal to a predetermined load, (ii) a speed of the engine is less than or equal to a predetermined speed, and (iii) a temperature of air leaving the first compressor is less than or equal to a predetermined temperature.