Discrete variable valve lift diagnostic control system
AssigneeGM Global Technology Operations LLC
InventorMatthew A. Wiles
Life of this patent
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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.
Claims22
A diagnostic control system for an internal combustion engine including a discrete variable valve lift (DVVL) system, comprising:
- a first module that determines a knock threshold value based on engine operating parameters;
- an engine knock sensor that generates a knock signal;
- and
- a second module that monitors a portion of said knock signal that is associated with a particular cylinder of said engine, that selectively identifies a fault of at least one valve of said DVVL system associated with said particular cylinder based on said portion and said knock threshold and that outputs a fault signal corresponding to said particular cylinder.
A method of inhibiting improper operation of an internal combustion engine including a discrete variable valve lift (DVVL) system, comprising:
- determining a knock threshold value based on engine operating parameters;
- generating a knock signal using an engine knock sensor;
- monitoring a portion of said knock signal that is associated with a particular cylinder of said engine;
- selectively identifying a fault of at least one valve of said DVVL system associated with said particular cylinder based on said portion and said knock threshold;
- and
- outputting a fault signal corresponding to said particular cylinder.
A method of operating an internal combustion engine including a plurality of cylinders and a discrete variable valve lift (DVVL) system, comprising:
- initiating a valve operating mode of said DVVL system;
- generating a knock signal using an engine knock sensor;
- monitoring a plurality of portions of said knock signal, each of which correspond to a particular cylinder of said engine;
- selectively identifying a fault of at least one valve of said DVVL system associated with one of said plurality of cylinders based on said portion corresponding to said one of said plurality of cylinders;
- and
- outputting a fault signal corresponding to said one of said plurality of cylinders.
Dependencies are inferred from the claim text.