DD229458A1 - CIRCUIT ARRANGEMENT OF AN ELECTRONIC SUPPLY SYSTEM FOR INTERNAL COMBUSTION ENGINES - Google Patents

Abstract

The invention relates to a switching arrangement of an electronic ignition system for internal combustion engines. The aim is to secure the economic operation of an internal combustion engine. The task is to facilitate the starting process of the machine by means of a short-stroke adjustment. This is achieved by means of the arrangement of a frequency-dependent switch, to which an AND element and an OR element are connected downstream, which influence the power parts for triggering ignition sparks. The arrangement processes provided square-wave signals which control the ignition timing as a function of speed. The invention is preferably applicable to two-cylinder two-stroke internal combustion engines. Fig. 1

Description

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Title of the invention:

"Switching arrangement of an electronic ignition system for Verbrennungskraftma machines"

Application of the invention:

The invention relates to a switching arrangement of an electronic ignition system for internal combustion engines for speed-dependent adjustment of the Zündseitpunktes, preferably in two-stroke internal combustion engines.

Characteristic of the known technical solutions: To realize ignition adjustments, circuits are known which initiate a switching operation as a function of the rotational speed or other engine parameters by means of electronic switching elements.

Thus, DE-OS 26 51 658 (F02P 5/00) known to induce by means of different length, offset by the displacement Magnetflußleitstücke two pulses and to use them by a threshold logic function of the speed for triggering the ignition. These devices with inductive sensor systems have not proven successful due to the speed dependence and require as large as possible angle differences between the ignition times.

By DE-OS 30 26 192 a device is known which provides signals for different ignition times. It requires a complex preparation of the encoder signal, a complicated delay device and further a Yorrangschaltung. It is used for idling stabilization and does not allow a narrow ignition timing.

Object of the invention:

The object of the invention is a switching arrangement that ensures economical operation of a two-stroke internal combustion engine with reasonable construction costs.

Explanation of the essence of the invention:

The object of the invention is to provide a switching arrangement that favors the starting process of a two-stroke internal combustion engine by a spark ignition at start speed is realized safely.

The object of the invention is achieved in that a power part are connected directly to a negative output of an AND gate and a second power section via a ETegator and a first input of the AND gate at the negative output of a second AND gate, while a second input the AND gate is at the output of an OR gate and a first input of the AND gate and a first input of the OR gate are together at the output of a frequency-dependent switch whose input is acted upon by a donor signal synchronized with the speed of the engine runs and that this signal is applied to the input of a Uegators whose output is connected to the second input of the OR gate and the second input of the AND gate is acted upon by a second encoder signal that is offset from the first signal by an angle.

The shift arrangement allows a jump adjustment of the ignition timing in response to a speed threshold by the ignition timing is advanced when exceeding the speed threshold. It can be realized with little effort in CMOS technology.

Embodiment:

The invention will be explained in more detail with reference to an exemplary embodiment:

Pig. 1 shows the switching arrangement

Pig. 2 shows the signal or. Switching state diagram

Two inputs 2 and 3 "which are each connected to a donor, not shown, carry signals A and B, the Y / incel- and drehzahlsyηehron run with an internal combustion engine and are mutually offset by an angle OC corresponding to the required ignition timing. The input 3 is followed by a hegator 4 whose output is connected to the inputs of a frequency-dependent switch 5 and an OR gate 6. The output of the frequency-dependent switch 5 is connected to the other input of the OR gate 6 and the input of an AND gate 7 in connection. The negating output of the AND gate 7 and the output of the OR gate 6 are located at the inputs of an AND gate 8, the negating output once applied directly to a power unit 9 for a cylinder of the internal combustion engine and a negator 10 at a second power unit 11 is applied for a second cylinder. The power parts 9 and 11 comprise a switching amplifier, ignition coil and spark plug in a known design.

The spark ignition adjustment below a fixed speed is effected as follows (FIG. 2 left signal representation):

The signal B, which is later by the angle OC than the signal A, passes through the input 3 to the inverter 4 and further to the input of the OR gate 6. This signal is at the same time at the frequency-dependent switch 5, at this low speed at the output a signal C with L-potential leads, which thus simultaneously applied to the other input of the OR gate 6, at whose output thus the negated signal B appears as a signal D. The signal C is at the same time with L potential on the AND gate 7 and thus blocks this for the signal A. At the output appears as a result of the alloy signal E with Η potential. The signals D and E are thus present at the inputs of the downstream AND element 8, as a result of which the signal F, which is identical to the signal B, appears at its negating output. The signal G is produced by the ignitor 10. The power elements 9 and 11 generate each at the transition from H to L-potential spark, in Fig. 2 with the arrow φ. are indicated and provided alternately for each cylinder of the internal combustion engine at each edge of the signal B.

When the speed threshold is exceeded, ie after the start of the internal combustion engine (FIG. 2 right signal representation), the frequency-dependent switch 5 generates at its output the signal C with Η-potential. This causes at the output of the OR gate 6, a signal D with a permanent Η potential. The negated signal B can thus not pass the OR gate 6. At the AND gate 7 causes the signal C with Η potential that the signal A negated happens and thus applied as • signal E at the AND gate 8 with the signal D. The signal F, which is identical here to the signal A, appears at its output. Since this is generated by the angle OC in front of the signal B, the ignition sparks of the power supply also arise.

Parts 9 and 11, earlier than the prescribed case at low speed. For each plank ides signal A now alternately creates a spark in the power parts 9 and 11th

Claims (1)

Claim: Switching arrangement of an electronic ignition system for internal combustion engines, which contains electronic components controlled by square-wave signals for adjusting the ignition time in dependence on a certain speed, characterized in that a negative output of an AND element (8) a power unit (9) directly and a second power part (11 ) are connected downstream via a negator (10) and a first input of the AND gate (8) at the negative output of a second Ünd element (7), while a second input of the AND gate (8) at the output of an OR gate (6) and a first input of the AND gate (7) and a first input of the OR gate (6) together at the output of a frequency-dependent switch (5), the input of which is acted upon by a transmitter signal (B) synchronously with the speed of the internal combustion engine and that this signal (B) at the input of an inverter (4) is applied, whose output to the second egg Input of the OR gate (6) is connected and the second input of the AND gate (7) with a second encoder signal (A) is applied, that the first signal (B) is offset by an angle (OC). (See 1 page drawings)