System and method for controlling fuel combustion for an interna

Details System and method for controlling fuel combustion for an interna System and method for controlling fuel combustion for an interna

1989-01-13

1990-08-14

Nelli, Raymond A.

Internal-combustion engines

Combustion chamber means combined with air-fuel mixture...

123486, 123179R, F02P 504

Patent

active

049478176

ABSTRACT:
A system and method for controlling fuel combustion for an internal combustion engine in which one of a plurality of maps representing basic control values derived according to the engine operating condition which corresponds to fuel having a high octane number is first and always selected and used for combustion control at an initial state of the engine whenever the engine is started. When the engine is transferred into a predetermined area of the engine operating condition during the use of the map, the ignition timing angle is retarded by a retardation amount upon detection of occurrence of engine knocking and the map is switched to another map which corresponds to fuel having a low octane number. A control value (e.g., ignition timing angle value) is set which controls the combustion state and a parameter associated with the engine combustion state is operated to control the combustion state on the basis of the control value. Therefore, the situation of being unable to use the map for high-octane gasoline can be avoided

REFERENCES:
patent: 4677878 (1987-07-01), Yamamori et al.
patent: 4715342 (1987-12-01), Nagai
patent: 4729358 (1988-03-01), Morita et al.
patent: 4821697 (1989-04-01), McDougal

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