Internal-combustion engines – Combustion chamber means combined with air-fuel mixture...
Patent
1989-08-15
1991-05-07
Nelli, Raymond A.
Internal-combustion engines
Combustion chamber means combined with air-fuel mixture...
F02P 518
Patent
active
050127829
ABSTRACT:
An engine control system for an internal combustion system changes an initially set control value either to a specified control value suitable for a grade of gasoline having a low octane rating when an engine operating condition is in a first operating zone for knocking detection ranging over a specific engine load and under a specific engine speed or to another specified value suitable for another grade of gasoline having a high octane rating when an engine operating condition is in a second operating zone for knocking detection ranging over the specific engine speed. Grades of gasoline delivered to the internal combustion engine are discriminated based on the frequency of knockings continually detected by a knock sensor. Gasoline delivered to the internal combustion engine is regarded as having a high octane rating when the frequency of knockings is at low level or as having a low octane rating when when the frequency of knockings is at a high level.
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Mazda Motor Corporation
Nelli Raymond A.
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