SU855245A1 - Electronic ignition system - Google Patents

Description

one

j The invention relates to electrical equipment for internal combustion engines operating without self-ignition, and, in particular, to the ignition systems of automobile engines.

Electronic burning systems are known for internal combustion engines, comprising a ignition coil, plugs, a chopper contacts, a storage capacitor, a discharge thyristor, and an auxiliary device for charging the storage capacitor. A high voltage pulse in systems of this type is formed when the storage capacitor is discharged through the ignition coil and the discharge thyristor. L The main disadvantage of electronic ignition systems containing an autogenerator as an auxiliary device is low efficiency, since the consumption of energy consumed from the battery occurs continuously except for the time of discharge of the cumulative capacitor to the ignition coil. The disadvantage can also be attributed to the absence of stabilization of the charging voltage of the storage capacitor, which depends on the voltage of the power supply {{n}. .

A known electronic ignition system comprising, as an auxiliary device, a trigger circuit, comprising a switching transistor operating in a pulsed mode, as well as a pulse transformer, a storage capacitor, a rectifier, and a chopper contact. In these systems, the voltage on the storage capacitor at the time of its discharge and the ignition coil reaches a certain constant value dependent on the voltage of the power source 2.

However, the charge of the storage capacitor occurs once during the operation of the chopper coitacts.

namely, when the breaker contacts open. In addition to TOio, there is no smooth adjustment of the storage capacitor charge and the energy of sparking.

The purpose of the inventions. - improving the efficiency and reliability of the ignition system.

The goal is achieved by the fact that in an electronic ignition system for internal combustion engines containing a composite transistor switch, in the output stage of which the primary winding of the pulse transformer is turned on, the secondary winding of which is connected to the primary winding of the ignition coil, interrupter contacts connected to the control electrode of the discharge thyristor through an RC-circuit and a diode, the discharge thyristor being connected in parallel to the output of the rectifier, and in The output transistor of the composite transistor switch and the thyristor are equipped with measuring resistors connected in series with the collector and cathode, the chopper contacts together with the additional thyristor form an asymmetrical inverter with a resistive load and a switching capacitor connected between its arms, and the anode of the additional thyristor is connected to the composite a transistor switch, and the cathode and the control electrode are parallel to the input of the variable resistor, the output of which is connected to the connection point of the collector of the output transistor of the composite transistor switch and the cathode of the discharge thyristor.

An additional transistor is connected in series with the additional thyristor of the unbalanced inverter, the emitter of which is connected directly to the anode of the additional thyristor, the base is connected to the switching capacitor and through the limiting resistor to the midpoint of the active load of the asymmetric inverter, and the collector with zener diodes.

FIG. 1 shows a circuit diagram of an electronic ignition system; in fig. 2 — voltage curves; in fig. 3 - a modified version of the inverter cxeNM.

The electronic ignition system consists of an ignition coil 1, a storage capacitor 2, a thyristor 3, a pulse transformer 4, a composite switching transistor switch on transistors 5 and 6, a measuring resistor 7, a measuring resistor 8 and an asymmetric inverter 9 with a resistive load used to control .

The power to the inverter 9 is supplied through a resistive load slider with resistors 10 and II as its arms.

The inverter contains as the active elements in one shoulder the contacts of the chopper 12, in the other - the thyristor 13

Claims (2)

1. US patent 9 3677255, cl. 123-148 E, published. 1977. 2. Authors certificate of the USSR 56601.6, cl. F 02 R 3/04, published. 1977. ABOUT T / 2 about g / g Og 2 Uf -E Ua well g / .2