IGNITION TIMING APPARATUS FOR INTERNAL-COMBUSTION ENGINES Russian patent published in 2000 - IPC

FIELD: electrical equipment of automobiles. SUBSTANCE: newly introduced in apparatus are comparator, pulse shaping circuit, pulse generator, NAND gate, counter, storage device, digital-to-analog converter, and controlled monostable multivibrator; output of engine shaft position sensor is coupled with input of comparator whose output is connected to input of controlled monostable multivibrator and to that of pulse shaping circuit; first output of the latter is coupled with first input of NAND gate, second output, with write input of storage device, and third input, with counter reset input. Pulse generator output is coupled with second input of NAND gate and output of the latter, with complementing input of counter; counter outputs are connected to storage device inputs and its outputs, to digital-to-analog converter circuit, converter output is coupled with control input of controlled monostable multivibrator whose output is connected to input of electronic igniter. EFFECT: improved precision of ignition timing responding to variations in engine speed. 3 dwg