Circuit of electronic ignition OEZ4 (OEZ43)

Electronic ignition OEZ4 (OEZ43) is determined for small four (three) cylinder motors without necessity to change set pre – ignition during motor operation (thus is fixed by DIP-switch) Detailed description of ignition OEZ43 can be found here.

Variant OEZ4 is determined only for four cylinderElektronické zapalování OEZ4 motors and has selectable re - phasing of outputs of 180°. As for variant OEZ43 it is possible to select number of cylinders of motor (4,3). We offer also ignition variant OEZ43VW determined for coils Bremi with integrated switch).

Basic features

  • Supplying voltage 12V, 2.5A
  • Number of switching coil outputs 4
  • Range of pre –ignition adjustment 90°
    (4-cylinders), 60° (3-cylinders)
  • adjustment step of required pre – ignition by DIP - switch (Range / 128) is 0.7° (4- cylinders), 0.47° (3- cylinders)
  • Number of input signals 2 (CLK, RES)
  • Output signal  with information about motor rotation (able to connect for example into rotation input of control system)
  • Selection of type of input sensors (Hall sensor unit, Induction sensor)

Process of signals

Ignition OEZ4 (OEZ43 as 4 - cylinders)

Ignition OEZ4 with re – phasing of outputs

Ignition OEZ43VW (three - cylinders)


Note: in variant OEZ43VW length of output impulses is shortened from 3,5ms to 2,5ms

Tester of ignition

For diagnostic purposes it is possible to deliver also tester of ignition, by which it is able to verify input signals partly by "oscilloscope" and by which it is also possible to simulate control signals.


Control element Possibilities Description
1 Display Res&Clk&12V Res&Clk Res Clk +12V +5V -5V Cycles Selection of measured and displayed signals. Number of measured processes effects speed of signal sampling (approx. 10kHz during 1 signal, 5kHz during 2 signals, 2.5kHz during three signals). Measurements of number of cycles are not in given tolerance.
2 Frequency 50Hz 25Hz Selection of frequency of generating additional signals Res and Clk on generator tester output.
3 Type Res Res/Induc. Res/Hall Selection of signal type Res of tester generator (simulation of induction sensor or Hall sensor unit)
4 Type Clk Clk/Induc. Clk/Hall Selection of signal type Clk of tester generator (simulation of induction sensor or Hall sensor unit)
5 Operation On/Off By pressing it is activated continuous operation of oscilloscope
6 Stop On/Off By pressing it is stopped continuous operation of oscilloscope, the last measured process remains on screen
7 Searching On/Off By pressing it is activated function of supplying voltage search. If this function is on and drop of supplying voltage is under 9V, oscilloscope is stopped (pressing of button Stop)

Control systems, measurement, regulation
CMS: Správce webu - Designed by advertising agency Yashica s.r.o. 2007