Internal-combustion engines – Combustion chamber means combined with air-fuel mixture...
Patent
1986-10-27
1987-12-08
Nelli, Raymond A.
Internal-combustion engines
Combustion chamber means combined with air-fuel mixture...
123417, F02P 515
Patent
active
047112158
ABSTRACT:
An LLP ignition timing control for an internal combustion engine periodically senses LPP in an engine combustion chamber and generates an average LPP value. A DLPP value indicating a desired LPP is generated; and ignition timing is periodically adjusted. The apparatus advances ignition timing if the average LPP value is retarded with respect to the DLPP value. The ignition timing is maintained in the same direction as the previous adjustment if the average LPP is advanced and becoming less advanced with respect to the DLPP value, but is reversed to the opposite direction from that of the previous adjustment if the average LPP is advanced and becoming more advanced with respect to the DLPP value. The amount of adjustment is proportional to the product of the difference between the average LPP value and DLPP value and the rate of change in the average LPP value. Thus, MBT is maintained in spite of the foldover effect in the LPP vs. spark advance curve produced by abnormal combustion modes without the need for independently sensing the abnormal combustion modes themselves.
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General Motors Corporation
Nelli Raymond A.
Sigler Robert M.
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