Electronic ignition timing advance circuit

Details Electronic ignition timing advance circuit Electronic ignition timing advance circuit

F - Mech Eng,Light,Heat,Weapons

02

P

317/5.3

F02P 5/155 (2006.01)

Patent

CA 1083659

AN ELECTRONIC IGNITION TIMING ADVANCE CIRCUIT ABSTRACT An electronic ignition circuit is disclosed which produces a spark timing signal for controlling the firing of the cylinders of an internal combustion engine. A sensor produced input signal having a frequency proportional to engine speed is coupled to an ignition timing means which produces a spark timing signal by controlling the charging and discharging of a capacitor. The produced spark timing signal differs in phase from the input signal as a pre- determined function of engine speed and the phase difference preferrably varies as function of speed according to a plurality of different slope line segments over a range of engine speeds. An advance means also receives the sensor input signal and produces a digital output signal for the timing means comprising a series of pulses synchronized with the input signal and having predetermined pulse widths related to the magnitude of the vacuum pressure produced by the engine. The ignition timing means charges a capacitor at a first rate during a portion of the period of the input signal, maintains the discharge on the capacitor at a constant level during the existence of the advance pulse and discharges the capacitor at a second rate after the occurrence of the advance pulse, This results in adding a predeter- mined amount of phase, determined by the magnitude of the vacuum pressure produced by the engine, to the speed depen- dent phase versus engine speed relationship produced by the ignition timing means.

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