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:
Jul. 26, 2005
Filed:
Sep. 18, 2003
Jeremy M. Plenzler, Royal Oak, MI (US);
Liyun Zheng, Troy, MI (US);
Jeremy M. Plenzler, Royal Oak, MI (US);
Liyun Zheng, Troy, MI (US);
General Motors Corporation, Detroit, MI (US);
Abstract
A lubrication system for an internal combustion engine having a pressure increasing valve and a pressure regulator valve to optimize oil flow through an engine to increase engine efficiency. The lubrication system includes an engine driven oil pump connected to supply pressurized oil through a main oil feed to a main bearing gallery, a cam gallery, a cam phaser and switching valve lifters. The pressure increasing valve connected between the main bearing gallery and the cam gallery restricts oil flow to the cam gallery to raise oil pressure supplied to the cam phaser. The pressure regulator valve connected between the pressure increasing valve and the cam gallery to control oil pressure supplied to the switching lifters for cylinder deactivation or stepping valve train operation. The optimization of oil flow allows the engine to use a smaller oil pump and thereby increase engine efficiency while providing for actuation of the cam phaser or the switching lifters over the full engine speed range.