SU603765A2 - Contactless ignition system for two-stroke internal combustion engines - Google Patents

Description

FIG. 1 is a diagram of this ignition system: in FIG. 2 - oscillogram of the EMF of the first generating winding per revolution of the rotor of the magneto: in FIG. 3 - os1shlogramma EMF second generation generating winding per revolution of the magneto rotor; in fig. 4 - oscillogram of the EMF of the control winding per revolution of the magneto rotor; in fig. 5 - oscillogram of voltage on thyristor (total voltage across storage capacitors).

The ignition system contains a flywheel magneto with generating 1,2 and controlling 3 windings, storage capacitors 4 and 5 connected between themselves in series through the primary winding of ignition coil 6, charging diodes 7 and 8, thyristor 9, the control electrode of which is connected through a diode Yus obmotksy 3, magnets 11 and 12, built-in engine flywheel.;

A diode 13 is connected between the potential ends of the windings 1.2, dp increasing the charging voltage of the capacitors 4, 5 and, thus, to expand the range of sparking rates of the cHcs system.

This ignition system works as follows.

During rotation, a motor wheel with magnets 11, 12 in a generating 1.2 and controlling 3 windings of magneto-induced emf, shifted one relative to the other in time.

A positive half-wave EMF of the generating winding 1 charges the capacitor 4 through diode 7. Negative half-waves EMF winding 1 Presses the capacitor 5 through diodes 13.8 and the primary winding of the coil, 6. The negative half-wave EMF of the winding 2 charges the capacitor 5 through the diode 8 and the primary winding of the coil 6.

The positive half-waves of the EDB winding „2“ recharge the capacitor 4 through diodes 13 and 7.

The voltage on the thyristor (Fig. 5) remains unchanged until the arrival of the control signal (4 mg. 4) from the winding 3 through the diode 10 to the control electrode of the thyristor 9. At the same time, the thyristor 9 opens and the capacitors 4 and 5, being connected in series, discharged to the primary winding of the coil b. The discharge of capacitors 4 and 5 to the primary winding of coil 6 causes a high voltage to the secondary winding, which is supplied to the spark plug of the motor.

As can be seen from FIG. 5, additional charging of capacitors 4.5 from generating windings 1.2 by switching diode 13 between their potential ends.

increases the voltage on the capacitors used to create the high voltage of the ignition coil.

Due to the increased natf on capacitors 4 and 5, it significantly expands

with a speed range in which the ignition system provides sparking on the engine spark plug.

Claims (1)

1. USSR author's certificate No. 524OO4, cl. F O2 P 1 / O2, 1973, V / h L L level unlocks thyristor L / g. 2 (at ig. 3 TO U) t V v Ll