device for electronic instellning of tendtidpunkt and utlosning of tendforlopp at a tendanleggning for a forbrenningsmotor

摘要

To accurately control the instant of ignition in internal combustion engines, a rapidly following sequence of pulses are generated, as the engine rotates; further, a single pulse is generated at a predetermined angular position of the engine crankshaft, which triggers an accumulator to count the number of pulses after that trigger pulse, and derive an analog, value representative, at any instant of time, of the angular position of the crankshaft. When this value is equal to a command value, a trigger pulse is generated which triggers the ignition system. The accumulator may be an integator which integrates an analog voltage. The trigger circuit then may include a comparator to which a voltage is applied representative of at least one parameter of operation of the engine so that the ignition timing can be varied in dependence on this parameter.