초록 ▼

An ignition timing control system for internal combustion engines includes a knock detecting circuit for determining the presence or absence of the knocking in response to a signal from a knock detector, and includes a correction advance computing circuit for computing a correction value of ignition

An ignition timing control system for internal combustion engines includes a knock detecting circuit for determining the presence or absence of the knocking in response to a signal from a knock detector, and includes a correction advance computing circuit for computing a correction value of ignition advance thereby to retard the ignition timing by a predetermined angle when the knock is present and to advance the ignition timing when the knock is absent. A further battery is provided to supply electric power to the correction advance computing circuit even after a key switch associated with a main battery for supplying power to the ignition timing control system has been turned off. Hence, the correction advance computing circuit memorizes the computed advance correction value corresponding to a knock condition of the engine just prior to the turn-off of the key switch and the memorized advance correction value is made available in a subsequent operation of the ignition timing control system.

대표청구항 ▼

An ignition timing control system for an internal combustion engine comprising: a knock detector for sensing vibrations of said engine; a knock detecting circuit for comparing an output signal of said knock detector with a predetermined threshold level and for generating a knock detection signal ind

An ignition timing control system for an internal combustion engine comprising: a knock detector for sensing vibrations of said engine; a knock detecting circuit for comparing an output signal of said knock detector with a predetermined threshold level and for generating a knock detection signal indicating when said output signal is above said predetermined threshold level; correction advance computing means, responsive to said knock detection signal, for computing an advance correction angle and generating an ignition advance correcting signal related thereto, said advance computing means comprising: counter means for counting said knock detection signal to determine the number n of knocks occurring within a predetermined number of engine ignitions; and comparator and computing means for (i) comparing the counted number n with upper and lower limits (a) and (b), respectively; (ii) producing said ignition advance correcting signal effective to retard ignition timing when n≥a; (iii) producing said ignition advance correcting signal effective to not alter ignition timing when b