| 摘要 |
<p>A device for controlling ignition and/or injection operations in a four-stroke internal combustion engine comprises a phase-locked loop (PLL) in which a frequency divider (14) divides the number of peaks of a triangular output waveform (w) by half the number of cylinders to produce a feedback signal which is compared in a phase comparator (10) with reference marks (BM) produced by a pulse generator associated on the engine crankshaft. The rotation of the crankshaft is thereby accurately divided into the required number of segments for the spark plugs of the individual cylinders. The speed-dependant capacitor (Cn) is charged or discharged upon an increase or decrease in speed (n) by means of a follower control (18), to adjust the output frequency of the waveform (w) so that it remains in synchronism with the reference marks (BM). The phase of the output waveform (w) is corrected upon an increase or decrease in speed (n) by means of the follower control (18) which either multiplies the current (iw) to charge the output capacitor (Cw) rapidly in a fraction of the period of the waveform upon an increase in speed (n) or sets the current (iw) at zero so that the output capacitor (Cw) temporarily holds its charge upon a decrease in speed (n).</p> |
