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:
Nov. 11, 2014
Filed:
Feb. 07, 2013
Ford Global Technologies, Llc, Dearborn, MI (US);
Jeremy Walter Church, Belleville, MI (US);
Ford Global Technologies, LLC, Dearborn, MI (US);
Abstract
A method of controlling a spool valve through feedback and feedforward mechanisms is described. In one example, a method includes actuating a spool valve via a solenoid to advance and retard a hydraulic variable cam timing actuator coupled to a camshaft, and while commanded to a null position to maintain current cam timing, modulating the solenoid with a component at a frequency synchronous to engine firing frequency to counteract cam torque oscillations. In this way, a spool valve may be maintained in a null position despite high cam torque oscillation frequency, thereby retaining oil in a solenoid assembly and improving can timing position.