DE1639124A1 - Spark ignition device for internal combustion engines - Google Patents

Description

Joseph ItUOSkQ (industries) ■. ifilQt ^ A

limited:. . ·. ⁹ ": - ***

Birmingham (England) 'Great King Street

IHmkenzünd device for internal combustion engines

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The invention relates to a limb ignition device for internal combustion engines *

The point ignition device according to the invention contains an ignition coil for the generation of! "Tokens * which are applied sequentially to the spark plugs of an internal combustion engine, and is characterized by ^: ' that a semiconductor switch is connected in the circuit of the ignition coil's ignition coil, each of which, ^v . wönn the semiconductor switch is switched off, a JHxüke is generated that a bias circuit is also provided that turns on the switch _f and a contact breaker is provided ^ de | γόη of the internal combustion engine is driven, and a coupling device for Kappein the contact breaker with the semiconductor switch and with the Torspaftnungaatromkreis is provided, wherein the semiconductor switch is abeaohauLtffc each time the contact breaker closes or opens,.

The fact that a spark'jtäeanal when the Contact cup opens or aphiiesgt, is generated, is for internal combustion engines with a larger number of cylinders particularly advantageous »

The attached drawing shows a wiring diagram

shown showing an execution.

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) Example of the invention

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In the drawing there is shown a positive and a negative supply line 11, 12 which, in operation, are connected to the battery of a motor vehicle via an ignition switch. The lines 11, 12 are bridged by means of a capacitor 13, and a resistor 14 and a contact breaker 15 are connected in parallel with the capacitor 13, the contact breaker 15 being driven in a known manner by the internal combustion engine. Me connection-

P between the resistor 14 and the contact breaker 15 is connected to the line 11 via a diode 16 connected in Heihe with a resistor 17 and is also through a capacitor 18 to the base of a n-p-n * transistor 19 connected, the base of which is also connected the line 12 via a diode 21 and a V / resistance 20 is applied in series. The emitter of transistor 19 is on line 12, during which Kolleleto :? is connected to the emitter of a second n-p-n transistor 22, the collector of which via a resistor i3 is applied to the line 11, and the base of which is applied to the line 11 via a resistor 24 and further • via a capacitor 25 to the junction of the

"Resistor 17 and the diode 16 is connected.

The collector of transistor 19 is also connected to the The base of an n-p-rn transistor 26 connected to its base also on line 12 via a resistor 27 to * - lies. The emitter of transistor 26 is connected to the ■ ■■■ - ■ 'line 12, would be its collector with the line Via a resistor 28 in series with the primary winding 29 of an ignition coil 31, the secondary winduhg 32 via a distributor with the spark plugs of the Internal combustion engine is connected in sequence. the

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The collector-emitter path of the transistor 26 is by means of a s spam-related resistance s 33 bridged,

The mode of operation of the spark ignition device is as follows: Assume that an ignition spark has just been generated, and the function; is again in a stable 'state, current flows through the resistor 24 to the Baoi.5 of the transistor 22, which is turned on and turns on the transistor 26, "ac -Jout .jtrom in the primary winding 29 flows. Ange · ios ^r i, en that at this moment the iContaktunterorecher 15 is closed, Ltrom also flows iiiio .. through the iderotand 14 and the contact breaker 15, the capacitor 18 is discharged üuce.-Blick, in which the contact breaker 15 opens, current flows through the resistor 14, the B-onden- £:. 'it'-r lb .i: id the base-iilfiitter-Btröi.kreis des Transistor I ;, Bu da.3H, the transistor 19 in the conductive state vux'aetz "· .vii'd, and the base current which is derived to the transistor 26 'i'üieööt,. Via the transistor 19. The transistor 26 is consequently in the non-conductive

u31; and networkedj. and the fall of the ilussefs-in the Z- '. iiya coil 31 produces an ignition spark. Me time constant άβο rfidür itrinäe.s ■ 14 and des - »ondensators Itj iat ä-erar-t. >: fv, - ^; ia.j3 the .raiisistor 19 for a predetermined 1. sL tai aiiiie'i · .. conductive states; remains and at the end of the 5ieöer.-eit.it: ar> ne .is switched off, so that the current, 3er to uei · -lasie of the transistor 1.6 flows again,.,. hi-end this. Step the Lünäensator is charged, - and ea flows again in the primary winding 29 3trcm. ·. ..

During the contact breaker 15 open. is, flows Strom ausa-erde ^ i through resistor 17, so that: kondenn-Ator 25 is charged. When the contact breaker 15 is closed again, the discharges

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Capacitor 18 through the contact breaker 15 and the diode 21. At the same time discharges, the capacitor 25 and is then in the opposite direction via the counter stand 24-, the diode 16 and the contact breaker 15 charged. This charging current derives the current from the base of transistor 22, which is thus placed in the non-conductive state and interrupts the base current to transistor 26, so that again the current flow in the ignition tank drops and an ignition spark is generated. The previous charging of the capacitor 25 via the resistor 17 results in a larger initial current and makes it possible / a smaller capacitor 25 to be used than would otherwise be required to achieve a given "switch-off time ^11" for the transistor.

The transistor 22 is after a certain period of time turned on again by the resistor 24 and the capacitor 25 is given, and this period is also chosen so that the current in connection 29 can be rebuilt before the contact breaker 15 again opens.

The capacitor 13 is provided to absorb transient voltages, and the voltage-dependent resistor Γ5 is provided to protect the transistor 26. The resistance 20 reduces the risk of the circuit becoming unwolit as a result of a contact impact. takes effect.

Claims;

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Claims (3)

T639124 1. Spark device for internal combustion engines with an ignition coil for generating sparks, -the the Sequentially applied to the spark plugs, characterized in that a semiconductor switch (26) in the circuit of the primary winding (29) of the Ignition coil (31) is switched, each time / when the semiconductor switch (26) is switched off, an ignition spark is generated that further a bias circuit is provided that the switch (26) switches on, furthermore a contact breaker (15) » which is driven by the internal combustion engine, and a coupling device for coupling the contact breaker (15) with the semiconductor switch (26) and with the bias circuit, the semiconductor switch (26) being switched off each time, when the contact breaker (15) closes or opens. ' 2. Device according to Anspruoii 1, characterized in that that the semiconductor switch (26) is a transistor, The (& ollektor-emitter track is connected in series with the primary winding (29) of the ignition coil (31) * 3. Device according to claim 2, _r characterized in that the bias circuit includes a second semiconductor (22) having a collector-emitter path has in the conductive state, in series with the base of the -first! Translators (26) in such a way 00988570610 _ ₆ _ BAD ORKSfNAIi - D - is connected so that both transistors (22, 26) are conductive are, where the IContact breaker (15) "when changing one of each of the two states (open or closed) serves to reduce the collector-emitter current of the second transistor (22) momentarily, so that the first transistor (26) is turned off, and the Contact breaker when changing its state (closed or open). serves to keep the basic current from the second transistor (22) to turn off both transistors (22, 24). 009885/0610 BAD ORlGiNAU