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Title: Diagnostic for two-mode variable valve activation device

A method is provided for diagnosing a multi-mode valve train device which selectively provides high lift and low lift to a combustion valve of an internal combustion engine having a camshaft phaser actuated by an electric motor. The method includes applying a variable electric current to the electric motor to achieve a desired camshaft phaser operational mode and commanding the multi-mode valve train device to a desired valve train device operational mode selected from a high lift mode and a low lift mode. The method also includes monitoring the variable electric current and calculating a first characteristic of the parameter. The method also includes comparing the calculated first characteristic against a predetermined value of the first characteristic measured when the multi-mode valve train device is known to be in the desired valve train device operational mode.
Authors:
Publication Date:
OSTI Identifier:
1117647
Report Number(s):
8,621,917
13/315,566
DOE Contract Number:
EE0003258
Resource Type:
Patent
Resource Relation:
Patent File Date: 2011 Dec 09
Research Org:
DOEEE (USDOE Office of Energy Efficiency and Renewable Energy (EE) (United States))
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING