Constant energy electronic ignition system

Details Constant energy electronic ignition system Constant energy electronic ignition system

F - Mech Eng,Light,Heat,Weapons

02

P

317/5.3

F02P 3/04 (2006.01) F02P 3/045 (2006.01) F02P 5/15 (2006.01)

Patent

CA 1051509

CONSTANT ENERGY ELECTRONIC IGNITION SYSTEM ABSTRACT A first sensor couples to an internal combustion engine and generates a first set of pulses suitable for ignition firing. A second sensor operates in synchronism to the first sensor produc- ing a second set of multiple pulses, during the interval between a first set of pulses, whose occurrence corresponds to specified angles of engine revolution and whose time duration is inversely related to engine RPM. The second pulse set is processed through a digital to analog converter having a staircase output voltage which is representative of instantaneous engine position. The second pulse set is further processed through an inte- grator, modified to produce an output approximating an inverse, or hyperbolic, functional relationship to the input, whereby output pulses are generated whose peak amplitude is representa- tive of instantaneous engine speed, i.e. RPM. Comparator circuitry produces a trigger signal corresponding to a predetermined relationship between the position voltage signal and speed pulses. The trigger signal activates-a-switch which initiates ignition coil dwell time such that the time in- terval from initiation of dwell time for recharging the coil to the next ignition firing is constant over substantially the en- tire range of operating RPM's thereby always recharging the coil to the same energy level between firings.

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