Method and apparatus for controlling spark timing in an internal combustion engine
AssigneeGM Global Technology Operations LLC
InventorsXiaofeng Yang, Wenbo Wang, Tang-Wei Kuo, Jeffrey M. Kaiser, Chao F. Daniels
Life of this patent
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Abstract
A method for operating a spark-ignition internal combustion engine includes controlling spark ignition timing responsive to a combustion charge flame speed corresponding to an engine operating point and a commanded air/fuel ratio associated with an operator torque request.
Claims13
A method for operating a spark-ignition internal combustion engine comprises controlling spark ignition timing by determining an initial spark timing corresponding to an engine operating point, and adjusting the initial spark timing using a spark timing compensation, where the spark timing compensation is determined by a change in combustion charge flame speed corresponding to the engine operating point and a commanded air/fuel ratio associated with an operator torque request.
Method for operating a spark-ignition internal combustion engine, comprising:
- determining an initial spark timing corresponding to an engine operating point;
- determining a commanded air/fuel ratio corresponding to an engine load;
- determining a change in a combustion charge flame speed corresponding to the commanded air/fuel ratio;
- determining a change in a combustion timing corresponding to the change in the combustion charge flame speed;
- determining a spark timing compensation corresponding to the change in the combustion timing;
- and
- adjusting the initial spark timing using the spark timing compensation.
Method for controlling a spark timing in a spark-ignition internal combustion engine, comprising:
- determining a commanded air/fuel ratio corresponding to an operator torque request;
- determining a change in a combustion charge flame speed corresponding to the commanded air/fuel ratio;
- determining a change in a combustion timing corresponding to the change in the combustion charge flame speed;
- determining a spark timing compensation corresponding to the change in the combustion timing;
- and
- adjusting the spark timing for an engine operating point using the spark timing compensation.
Dependencies are inferred from the claim text.