DE3341214A1 - MAGNET HIGH VOLTAGE CAPACITOR IGNITION SYSTEM FOR INTERNAL COMBUSTION ENGINES - Google Patents

Description

Title of the invention.

Magnetic high-voltage capacitor ignition system for internal combustion engines

Field of application of the invention:

The invention relates to a magnetic high-voltage capacitor ignition system for internal combustion engines consisting of one excited by means of permanent magnets of alternating polarity Generator with a winding for charging a capacitance and a control winding which is solely responsible for controlling a Semiconductor switch at the ignition point is used to discharge the capacitance to an ignition coil.

Characteristic of the known technical solutions: It is purely certain applications of internal combustion engines required, exceeding a specified speed to prevent. This is often done by turning off the ignition by charging the capacity above the set Speed is suppressed (DB - OS 26 06 824; 24 19 776). Additional semiconductor switches are used for this purpose, further control pulses are to be provided for their activation. This leads to increased construction costs. .

V / pus is known to be certain by a separate signal Duration to prevent the control pulse from affecting the semiconductor switch (DE-OS 26 30 261). The signal will

33412H

. Generated by means of a flip-flop circuit, which is suitable for this area of application is too expensive.

Additional conductor elements always require one certain limitation of reliability.

Aim of the invention:

The invention aims to simplify operation an internal combustion engine and the protection of the driven Units with reasonable effort and high reliability.

Explain the essence of the invention:

The object of the invention is the creation of an ignition spark Above a specified limiting speed to prevent without additional generator windings and semiconductor switches with simple connection to existing systems,

The problem is solved by connecting a capacitance in parallel to the control winding, the size of which is dimensioned is that the induced control voltage at the limiting speed the control threshold of the semiconductor switch no longer reached. By connecting or disconnecting additional capacities, the limiting speed can be changed in stages will be realized. It is also advantageous to connect a thermistor to the control winding in parallel. The use of passive components enables the unproblematic construction of an easily connectable to existing ignition system, reliable facility.

EXAMPLE OF EXECUTION:

The drawing shows the circuit diagram of an example, which is explained in more detail:

The shaft of an internal combustion engine, not shown, drives a pole wheel 1- in the direction of the arrow, which has several permanent magnets 2 with alternating polarity N (north pole) and S (south pole) of the adjacent permanent magnets 2 contains. A charging winding 3 is via diode 4 with a capacitance and the anode of a thyristor 6 as a semiconductor switch tied together. The capacitance 5 is the primary winding of a Downstream of the ignition coil 7, the secondary winding of which is connected to a spark plug 8. The steering committee exists from a control winding 9, which via a resistor network 10 and a diode 11 to the control terminal of the Thyristor 6 is connected. Capacities 12; 13 and a thermistor 14 are connected to the control winding 9 in parallel. The capacitor 12 is a switch 15 in series.

With the rotation of the pole wheel 1, a voltage is continuously induced in the charging winding 3, its positive half-waves Charge capacity 5 via diode 4. In the control winding 9 certain permanent magnets are designed accordingly 2 induces voltage pulses at the ignition point of the internal combustion engine, which are applied to the resistor network 10, which loads the control winding 9 in a defined manner to ensure an interference-free control function. The positive ones Control pulses reach the control terminal of the thyristor 6 via diode 11 and switch it on. Through this the capacitance 5 can discharge through the primary winding of the ignition coil 7 and the known process of Sparking on the spark plug 8.

The control winding 9 is now additionally loaded by the capacitance 13, this loading with increasing frequency

33412H

the control impulses d. H. rait stoning speed of the internal combustion engine increases until the control pulses are reduced to such an extent that they no longer meet the necessary control threshold to turn on the thyristor 6 reach. This means that there is no longer any spark formation on the spark plug 8 comes about and the speed of the combustion engine drops to values below the specified limit speed. the The size of the capacitance 13 depends on the complex resistance of the control circuit and the limiting speed to be defined. Its smaller capacity results in a higher limiting speed. By connecting or disconnecting additional capacitors 12 by means of a switch 15, it is thus possible a lower or higher limiting speed can be set. This is for applications of the internal combustion engine advantageous where different limiting speeds are required.

The thermistor 14 takes lower resistance values with heating and thus compensates for temperature influences in the entire control circuit, so that the change in the limiting speed is restricted with the heating.

■ 3341 * 14

List of the reference symbols used

for registration "Magnet high voltage capacitor ignition for internal combustion engines "

1 Pole wheel 2 Permanent magnets 3 Charging winding 4th diode 5 capacity 6th Thyristor 7th ignition coil 8th spark plug 9 Control winding 10 Resistor network 11th diode 12th capacity 13th capacity 14th Thermistor 15th counter N Polarity (Word) S. Polarity (south)

Claims (3)

Invention claim: 1 ,) Magnetic high-voltage capacitor ignition system for internal combustion engines consisting of a generator excited by permanent magnets of alternating polarity with a winding to charge a capacitance and a control winding which is used solely to control a semiconductor switch to discharge the capacitance to an ignition coil characterized in that the control winding (9) is connected in parallel with a capacitance (13) whose size is dimensioned so that the control pulses induced in the control winding (9) no longer reach the control threshold of a thyristor (6) at a fixed limiting speed. 2. Magnetic high-voltage capacitor ignition system for internal combustion engines characterized, that the control winding (9) in addition to the capacitance (13), the series connection of a capacitance (12) and one Switch (15) is connected in parallel. 3. Magnetic high-voltage capacitor ignition system for internal combustion engines characterized, that the control winding (9) a thermistor (14) is connected in parallel.