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

1991-07-30

1992-11-24

Neill, Raymond A.

Internal-combustion engines

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

F02P 514

Patent

active

051653788

ABSTRACT:
An ignition timing control system for vehicle internal combustion engines, in which the basic ignition timing is determined for a detected engine speed and load and when knock occurs, the basic ignition timing is retarded by a unit amount. A counter is provided for determining the occurrence rate of knock, the value of which is incremented each time knock occurs and is decrement if no knock occurs within a predetermined number of firings. Based on the counter values, a period is determined. When knock occurs, the retard adjustment is started and is continued for the period even when knock has ceased in the course of retard adjustment. The predetermined number of firings for defining a wait period before the counter value is decremented is set to equal the number of cylinders of the engine concerned. Alternatively, the predetermined number of firings can be varied with the knock occurrence rate counter value.

REFERENCES:
patent: 4892074 (1990-01-01), Iriyama
patent: 4896642 (1990-01-01), Washino et al.
patent: 4971007 (1990-11-01), Gopp et al.
patent: 4981124 (1991-01-01), Sellnar et al.
patent: 4991554 (1991-02-01), Wataya
patent: 5038735 (1991-08-01), Nosoyo et al.
patent: 5038736 (1991-08-01), Ohkume et al.

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