SU667682A1 - Contact-thyristor ignition system - Google Patents

Description

(54) CONTACT-THYRISTOR IGNITION SYSTEM

one

The invention relates to a pulse technique and can be used in internal combustion engines.

An ignition system is known in which the contact of the chopper 1 is used as a command element.

The disadvantage of this system is the possibility of false positives.

The closest technical solution to this invention is a contact thyristor ignition system for internal combustion engines containing a transistor voltage converter with a mass and potential terminals, the output of which is connected to a storage capacitor connected in series with the primary winding of the ignition coil and parallel to the circuit formed by the capacitor and the primary winding of the ignition coil, a thyristor is connected, the control electrode, whose electrode is connected to the interrupter contacts l through an amplifier-shaper with a delay circuit formed by an input transistor, a trigger on transistors of different conductivity and an output transistor 2.

However, this system has a low reliability.

The purpose of the invention is to increase the reliability of the ignition system.

For this, in a contact-thyristor ignition system for internal combustion engines, which contains a transistor voltage converter with a mass and potential terminals, the output of which is connected to a storage capacitor connected in series with the primary winding of the ignition coil and parallel to the circuit formed by the capacitor and the primary winding of the coil ignition, a thyristor is connected, the control electrode of which is connected to the contacts

Claims (2)

a chopper through an amplifier-shaper with a delay circuit formed by an input transistor, a trigger for transistors of different conductivity and an output transistor, a delayed-circuit capacitor connected in parallel to the trigger input through a chopper contacts, and through a resistive divider to the emitter of the output transistor of the amplifier-transformer, the output transistor base connected through a resistor to the collector of the input transistor. Ma drawing shows a conceptual electrical scheme of the ignition circuit. The contact-receiver system of the ignition for internal engines contains a transistor voltage converter 1. Its output is connected to a storage capacitor 2 connected in series with the primary winding 3 of the ignition coil 4, and in parallel with the circuit formed by the capacitor 2 and the primary winding 3 of the ignition coil 4 is connected thyristor 5, the control electrode of which is connected to the contacts of the chopper 6 through the amplifier-shaper 7 formed by the input transistor 8, the trigger 9 on the transistors 10, 1 1 of different conductivity and the output transistor 12. The capacitor 13 and the resistor 14 play the role of a delay element (circuit). The capacitor 13 is connected through the contacts of the chopper 6 parallel to the input of the trigger 9, and through a resistive divider of resistors 15, 16 - to the emitter of the output transistor 12 of the amplifier-former 7. The base of the output transistor 12 through the resistor 17 is connected to the collector of the input transistor 8. Contact-transmitter system Ignition works in the following way. Before the opening of the contacts of the chopper 6, the state of the circuit is as follows: transistors 8 and 12 are closed, and transistors 10, 11 are open, capacitor 13 is discharged, and capacitor 18 is charged. When the contacts of the breaker 6 are opened, the transistor 8 opens, and through it the resistor 19 starts charging the capacitor 13. At this point, a voltage drop occurs on the resistor 19, which opens the transistor 12 through the resistor 17. The capacitor 18 is discharged to the control of the thyristor 5 electrode and opens it. When the potential on the capacitor 13 is compared with the emitter potential of the transistor 12, the transistors 10, 11, 12 are closed, and the potential on the capacitor 13 continues to grow until it is comparable to the potential of the positive pole of the power supply. In this position, the circuit is located until the contacts of the chopper 6 are closed. In this case, the transistor 8 is closed. Since the potential on the capacitor 13 is higher than the emitter potential of the transistor 12, the transistors 10 and 11 are closed, and the capacitor 13 is discharged through resistors 14 and 19. As long as the potential on the capacitor 13 is higher than the emitter potential of transistor 12, when the contacts of the chopper 6 are opened, transistor 8 opens, and transistor 12 does not open, thereby excluding the supply of spurious pulses to the control of the thyristor electrode 5 (nl 11 | 1). The first electrode of the thyristor 5 pulse) l is lost when switching the circuit from the initial state, when the contacts of the breaker 6 are opened, and the return of the circuit to the initial state after closing the contacts of the breaker 6 occurs after some time, determined by the delay of the circuit holders (capacitor 13 and pc n yr 14), longer than the time of chattering of the chopper 6. When the potential on the capacitor 1 is reduced to the emitter potential of transistor 12, transistors 1 1 and 12 begin to open, an avalanche-like opener of transistors 10, 11, capacitor 13 occurs the circuit is quickly discharged, and the circuit is ready to issue the next control pulse. Claims of contact-ignition system for internal combustion engines, comprising a transistor voltage converter with a mass and potential terminals, the output of which is connected to a storage capacitor connected in series with the primary winding of the ignition coil and parallel to the circuit formed by the capacitor and the primary winding of the ignition coil, a thyristor is connected, the control electrode of which is connected to the contacts of the chopper through an amplifier-shaper with a set circuit Ledge formed by an input thyristor, a trigger on transistors of different conductivity and an output transistor, characterized in that, in order to increase reliability, the delay circuit capacitor is connected in parallel to the trigger input through the breaker contacts, and through a resistive divider to the emitter of the output transistor of the forcing amplifier, and The base of the output transistor is connected through a resistor to the collector of the input transistor. Sources of information taken into account in the examination 1. Japanese Patent No. 50-14303, cl. 51 G 22, publ. 1975. 2. The patent of Japan L 48-32523. cl. 51 G 22, publ. 1973.