| 摘要 |
The ignition system for internal combustion engines comprises a rotor and an armature provided with an ignition coil in which voltage signals, each having pulses of opposite polarities are cyclically induced during each revolution of the rotor; a control unit for the ignition current comprises a current-control switch which can be triggered during a positive pulse of the voltage signals, to cut off the current in the primary winding and generate a high voltage on the secondary winding of the ignition coil. A second control switch has the control electrode connected both to a current-control resistor in series with the current-control switch, and to the outlet of a voltage comparator connected to a timing circuit enabling the sparking within a pre-established time interval, during a positive pulse of each voltage signal, preventing the sparking when the engine is running below a minimum rotational speed, during the forward rotation and at the reverse rotation of the same engine.
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