초록 ▼

A control circuit which includes a circuit for regulating the time taken to desaturate the switching transistor. This regulating circuit is arranged to control the time for which the transistor is conductive, so that the desaturation time of the transistor is substantially nil when the rate of rotat

A control circuit which includes a circuit for regulating the time taken to desaturate the switching transistor. This regulating circuit is arranged to control the time for which the transistor is conductive, so that the desaturation time of the transistor is substantially nil when the rate of rotation of the engine is greater than a predetermined value.

대표청구항 ▼

An electronic system for controlling the ignition of an internal combustion engine, comprising: a magnetic pulse generator (1 to 3) for outputting a signal (A) having a frequency and amplitude substantially proportional to the rate of rotation (n) of the engine, an ignition coil (4 to 6) the seconda

An electronic system for controlling the ignition of an internal combustion engine, comprising: a magnetic pulse generator (1 to 3) for outputting a signal (A) having a frequency and amplitude substantially proportional to the rate of rotation (n) of the engine, an ignition coil (4 to 6) the secondary winding (6) of which can be coupled selectively and cyclically to the plugs (SP) of the engine to generate the spark, a switching transistor (7) connected to the primary winding (5) of the coil (4 to 6), and an electronic control circuit (8 to 34) which is connected to the pulse generator (1 to 3) and to the switching transistor (7) and which, in order to cause a spark to be generated, is arranged to cause a. the transistor (7) to become saturated at a first moment determined by the characteristics of the signal (A) from the pulse generator (1 to 3) to allow current to pass through the primary winding (5) of the ignition coil (4 to 6), b. the transistor (7) to be desaturated immediately the current (I) has reached a predetermined value in order to limit the intensity of the current, and c. the transistor (7) to be cut off at a second moment determined by the characteristics of the signal (A) from the pulse generator (1 to 3) to interrupt the current (I), characterised in that the control circuit (8 to 34) includes: electrical sensor means (14) for providing a signal (Vip) indicative of the rate of rotation of the engine, and a circuit (C2, 20 to 23) for regulating the desaturation time of the transistor (7), coupled to the electrical sensor means (14) and arranged to control the time for which the transistor (7) is conductive so that the length of the desaturation time of the transistor (7) is substantially nil when the rate of rotation of the engine is greater than the predetermined value (n0).