Engine idle stabilization timing circuit

Details Engine idle stabilization timing circuit Engine idle stabilization timing circuit

F - Mech Eng,Light,Heat,Weapons

02

P

341/94

F02P 5/155 (2006.01)

Patent

CA 1307838

Abstract A timing circuit is provided for stabilizing idling of an internal combustion engine, particularly marine racing applications where idle speed must be reduced to enable gear engagement, notwithstanding the use of a racing cam otherwise requiring higher idlinq speed. Delay means provides a radical reduction in spark timing along a negative slope relative to a baseline curve up to a predetermined speed such as 900 rpm at which there is maximum relative timing delay . As speed increases in this range, there is more retard because of the negative slope, which further retarded timing slows engine speed, hence providing self-stabilization. As engine speed decreases in such range, there is less retard, and the advanced timing increases engine speed, again providing self- stabilization, At engine speed increases above the predetermined speed such as 900 rpm, there is a rapid advance in timing along a steeper positive slope to merge with the baseline curve . Cranking and warm-up control circuitry and acceleration detec- tion circuitry are also provided for eliminating or reducing the relative timing delay under conditions where maximum spark advance is desired.

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