Engine spark timing system and method with supplementary...

Details Engine spark timing system and method with supplementary... Engine spark timing system and method with supplementary...

F - Mech Eng,Light,Heat,Weapons

02

P

317/5.35

F02P 3/04 (2006.01) F02P 3/02 (2006.01) F02P 5/155 (2006.01)

Patent

CA 1105986

C-2859 D-1,098 ENGINE SPARK TIMING SYSTEM AND METHOD WITH SUPPLEMENTARY RETARD IN NORMAL AND STARTING MODES Abstract of the Disclosure An engine spark timing system includes pulse gener- ating apparatus effective to generate conventional spark timing pulses, apparatus, including a first capacitor, effective to vary the voltage across the first capacitor in one direction at a first rate toward a reference voltage and generate a retarded spark timing pulse when the first voltage is reached, apparatus initiated at the time the retarded spark timing pulse is generated to vary the voltage across the capacitor in the opposite direction at a second rate until the next conventional spark timing pulse and apparatus responsive to engine start and one or more other engine operating con- ditions to substitute selected retarded spark timing pulses for the corresponding conventional spark timing pulses in the firing of the engine spark plugs. In order that the capacitor voltage not reach its maximum value and clip during the slower engine speeds typical of engine start, apparatus responsive to the actuation of engine cranking means is effective to insert a second capacitor parallel with the first capacitor to slow the rates of voltage change across the capacitor in both directions in the same proportion.

304819

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