| 摘要 |
<p>The system comprises at least one spark plug (SP). at least one ignition coil (10) whose secondary winding (12) is connectible to the at least one plug (SP) to generate a spark, at least one controlled commutator device (13) adapted to assume first and second conditions to permit and to interrupt respectively the flow of a current (I) in the primary winding (11) of the at least one ignition coil (10), a device (15-17) for monitoring the intensity of the current (I) flowing in the primary winding (11) of the ignition coil (10), electrical sensors (3-6) which provide signals indicative of the operating conditions of the engine, and an electronic control unit (7) arranged to pilot the commutator device (13) in a predetermined manner according to the signals provided by the sensors (3-6) and by the device (15-17) monitoring the current (I) in the primary winding (11) of the ignition coil (10). The control unit (7) is provided with memory devices (8) in which there are stored data indicative of predetermined, final values (Ifi) for the current (I) in the primary winding (11) of the ignition coil (10), associated with various operating conditions of the engine identifiable from the signals provided by the sensor (3-6). The control unit (7) is also arranged to pilot the commutator device (13) so that, each time a spark needs to be generated, the flow of current in the primary winding (11) of the ignition coil (10) is stopped when the magnitude of this current has reached the value (Ifi) which is associated in the memory devices (8) with the prevailing operating conditions of the engine, indicated by the sensors (3-6). The ignition system is thus able to "modulate" the energy of the spark, adjusting it to the operating conditions of the engine.</p> |
