Discrete variable valve lift diagnostic control system

Details Discrete variable valve lift diagnostic control system Discrete variable valve lift diagnostic control system

2007-02-09

2008-10-28

Wolfe, Jr., Willis R (Department: 3747)

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

With indicator or control of power plant

C701S103000, C701S111000, C123S090150, C073S114790

Reexamination Certificate

active

07444236

ABSTRACT:
A diagnostic control system for an internal combustion engine including a discrete variable valve lift (DVVL) system includes a first module that determines a knock threshold value based on engine operating parameters and an engine knock sensor that generates a knock signal. A second module monitors a portion of the knock signal that is associated with a particular cylinder of the engine, selectively identifies a fault of at least one valve of the DVVL system associated with the particular cylinder based on the portion and the knock threshold, and outputs a fault signal corresponding to the particular cylinder.

REFERENCES:
patent: 6769404 (2004-08-01), Aoyama et al.
patent: 7063057 (2006-06-01), Waters et al.
patent: 7146851 (2006-12-01), Wakahara et al.
patent: 7387018 (2008-06-01), Wiles
patent: WO 01/59281 (2001-08-01), None

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