Gm Global Technolgoy Operations, Inc.

Turgay Bengisu

Kenneth C Tesner

Victor A Fiorini

Pradheep C Velusamy

Michael Duva

A diagnostic system for a vehicle includes a difference module, a Fourier module, and a fault module. The difference module determines pressure differences for a camshaft revolution based on differences between: first pressures within first chambers of a camshaft phaser measured during the camshaft revolution, wherein the first pressures within the first chamber control advancement of the camshaft relative to a crankshaft of an engine; and second pressures within second chambers of the camshaft phaser measured during the camshaft revolution, wherein the second pressures within the second chamber control retardation of the camshaft relative to the crankshaft of the engine. The Fourier module performs a Fourier Transform (FT) based on the pressure differences to produce FT data. The fault module, based on the FT data, selectively indicates that a fault is present in a variable valve lift mechanism that is actuated by the camshaft.

Variable valve lift diagnostic systems and methods using cam phaser differential oil pressure

A damper for a linear element of a motor vehicle drivetrain such as a cable, a transmission oil fill tube or an engine oil dipstick tube constitutes a loose fitting sleeve or annulus disposed about the linear component. The damper may be positioned on a substantially vertical tube by a stop which may be any device such as a sleeve of material having an outside diameter larger than the inside diameter of the damper that is clamped or secured to the tube. Alternatively, the damper may be of sufficient length that one end may be clamped to the tube while the other end, which loosely fits on the tube, acts as a damper. The damper may be fabricated of a material such as closed cell foam or other relatively lightweight, resilient and compressible material.

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West Bloomfield, MI, United States of America

Turgay Bengisu