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Discrete variable valve lift diagnostic systems and methods

A diagnostic system, valve lift technology, applied in the direction of valve device, electrical control, machine/engine, etc.

Inactive Publication Date: 2008-05-21
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, when the switchable roller finger follower SRFF of the DVVL system switches from low-lift (LL) valve scheduling to high-lift (HL) valve scheduling, thereby preventing one or more valves from LL scheduling Switch to HL progress

Method used

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  • Discrete variable valve lift diagnostic systems and methods
  • Discrete variable valve lift diagnostic systems and methods
  • Discrete variable valve lift diagnostic systems and methods

Examples

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Embodiment Construction

[0020] The following description is merely exemplary in nature and is not intended to limit the disclosure, its application or uses. As used herein, the term module refers to an application-specific integrated circuit (ASIC), electronic circuit, processor (shared, dedicated, or grouped) and memory, combined logic, and / or or other suitable components that provide the described functionality.

[0021] Referring now to FIG. 1 , an engine system 10 includes an engine 12 that combusts an air / fuel mixture to produce drive torque. Air is drawn into an intake manifold 14 through a throttle valve 16 . A throttle valve 16 regulates air flow into the intake manifold 14 . Air within the intake manifold 14 is distributed into the cylinders 18 . Although six cylinders are shown, the engine 12 may include additional or fewer cylinders 18 . For example, engines with 2, 3, 4, 5, 8, 10 and 12 cylinders are contemplated. Although FIG. 1 depicts the cylinders in a V-shaped configuration, it ...

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Abstract

A diagnostic system for a discrete variable valve lift system of an internal combustion engine is provided. The system includes: a Fast Fourier Transform (FFT) module that generates a frequency content signal based on a FFT method and a valve impact sensor signal; and a malfunction module that selectively diagnoses a malfunction of a discrete variable valve lift system based on the frequency content signal.

Description

technical field [0001] The present disclosure relates to vehicle diagnostic systems, and more particularly to diagnostic systems that detect failure of components in discrete variable lift valvetrains of internal combustion engines. Background technique [0002] Common modes of vehicular transportation may include internal combustion engines that generate drive torque on a two- or four-stroke basis. These internal combustion engines generally have poppet valve arrangements to facilitate the introduction and subsequent exhaust of combustion air and fuel. [0003] For example, the engine can operate a real working fluid according to the Otto air standard thermodynamic cycle. The engine includes a poppet valve system coupled to a slider crank mechanism that creates a variable volume in the rotating domain. The piston comes to rest at the top of travel (top dead center - TDC) and starts to travel down. The intake valve is selectively opened so that air can be drawn into the c...

Claims

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Application Information

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IPC IPC(8): F02D41/22F02D41/00F02D9/02F02D45/00
CPCF02D13/0211F02D2041/288F01L1/34F01L2001/0537F02D2041/001F01L2800/11F02D41/221F01L13/0036F01L1/18F01L1/022F01L2105/00Y02T10/18F02D2041/1432Y02T10/40F02D35/027F01L2820/01F02D13/0219F01L2305/00Y02T10/12
Inventor M·A·威尔斯
Owner GM GLOBAL TECH OPERATIONS LLC
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