Ignition timing control system for internal combustion engine

Details Ignition timing control system for internal combustion engine Ignition timing control system for internal combustion engine

1991-07-29

1992-07-21

Argenbright, Tony M.

Internal-combustion engines

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

F02D 515

Patent

active

051313707

ABSTRACT:
A system for controlling ignition timing of a vehicle internal combustion engine, in which a plurality of sets of ignition timing control characteristics are established in response to the octane numbers of different kinds of fuel which may intentionally or unintentionally be used in the vehicle. The system infers the octane number of the fuel being used from the occurrence state of knock and selects the set of control characteristics corresponding to the selected fuel octane number, whereafter it determines the ignition timing based on the selected set of control characteristics. The system overcomes the problem of unnecessarily reduced torque occurring when the set of characteristics for low octane number fuel is misselected when the vehicle is running on high octane number fuel, as may happen particularly at the time of engine cold start, since during warmup the engine is apt to produce mechanical noise resulting in spurious knock detection. Upon completion of engine warmup, the system concerned advances the ignition timing by unit amounts if no knock occurs in the course of the advancement, forcibly shifts from retarded to advanced characteristics.

REFERENCES:
patent: 4630584 (1986-12-01), Higashiyama et al.
patent: 4854286 (1989-08-01), Chemnitzer
patent: 4913116 (1990-04-01), Katogi et al.
patent: 4947817 (1990-08-01), Ido

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