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. 03, 2015
Filed:
Jul. 23, 2014
Zhijian James Wu, Rochester Hills, MI (US);
Steven J Gorgas, Ortonville, MI (US);
Brian P Gebby, Macomb, MI (US);
Ethan E Bayer, Lake Orion, MI (US);
Kevin V Rafalo, Milford, MI (US);
Julian D John, Oakland, MI (US);
Jacob a Kohn, West Bloomfield, MI (US);
Zhijian James Wu, Rochester Hills, MI (US);
Steven J Gorgas, Ortonville, MI (US);
Brian P Gebby, Macomb, MI (US);
Ethan E Bayer, Lake Orion, MI (US);
Kevin V Rafalo, Milford, MI (US);
Julian D John, Oakland, MI (US);
Jacob A Kohn, West Bloomfield, MI (US);
FCA US LLC, Auburn Hills, MI (US);
Abstract
An engine system and method for variable valve lift (VVL) diagnostic techniques are provided. In one exemplary implementation, the techniques include receiving, at a controller, a camshaft position signal indicative of detected edges of teeth of a camshaft toothed member that is coupled to a camshaft of an engine. The camshaft is configured to actuate a VVL system, which is configured to control a lift of a valve of the engine. The techniques also include calculating, at the controller, a camshaft speed signal indicative of a rotational speed of the camshaft based on the camshaft position signal. A valve stuck index (VSI) value is then calculated, at the controller, based on the camshaft speed signal. The techniques also include determining, at the controller, whether the valve is stuck based on a comparison of the VSI value to a predetermined threshold.