Octane corrector - ignition unit. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Octane corrector - ignition unit. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Automobile. Ignition

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The octane corrector described by V. Sidorchuk in [1], with subsequent modifications [2, 3], is still well-deservedly popular among car radio amateurs due to its simplicity, extremely high reliability in operation, and excellent repeatability. Analyzing (as the author of improvements) the numerous journal mail on this topic, I came to the conclusion that the main difficulty lies in ensuring the normal operation of the octane corrector with ignition units of various types.

For example, in [2, 3], a design is considered that is designed to work together with block 3620.3734. However, by now it has been discontinued, and in connection with this, in different regions there are problems with its acquisition. Also, readers often have questions about connecting an octane corrector to various industrial ignition systems of the "Iskra", "Electronics" series, etc.

Octane corrector - ignition unit

The purpose of this article is to help those who, for one reason or another, cannot equip their cars with V. Sidorchuk's octane corrector.

The tests of the octane corrector with the indicated modifications showed that the device described in [2, 3] can be successfully used as a transistor ignition system (i.e., the electronic ignition unit available on the car becomes unnecessary). To do this, it only needs to be supplemented with an output current amplifier based on KT315B and KT898A1 transistors. The figure shows a diagram of the output stage of such a block to the octane corrector (Fig. 1 in [3]).

The octane corrector is assembled on a printed circuit board, the drawing of which is shown in fig. 2 in [2] It is very convenient to place the complete ignition system in the housing from the KET-1A motorcycle ignition unit. Transistor VT4, resistor R10 are soldered to the octane corrector board from the printed conductors side. The Zener diode VD3 is installed in the finished threaded hole M4 inside the case, and the transistor VT5 is installed on the bottom, for which it is necessary to drill a hole and cut the M8 thread in it. The surface of the bottom of the case in this place should be cleaned with fine-grained sandpaper. Before installing the transistor, its surface adjacent to the bottom is covered with KPT-24 heat-conducting paste or LITOL-11 grease. Resistor RXNUMX is conveniently soldered by surface mounting to the block at the same time as installing the final adjusted octane corrector board.

The establishment of an octane corrector in this embodiment is no different from that described earlier. Jumpers should be installed according to option B (VAZ-2108) for use with a contact ignition system, resistor R1 with a resistance of 510 Ohm, the input of the device should be connected to the breaker terminal, or according to option A (VAZ-2106) for use with a contactless ignition system type VAZ-2108 , resistor R1 with a resistance of 2.7 kOhm.

It should be noted that if the described system is used in vehicles of the VAZ-2108 and VAZ-2109 groups, it is necessary to replace the ignition coil 27.3705 with B117A. A slight decrease in the energy of the spark in this case is partially offset by a long energy accumulation time due to an increase in the duty cycle (3 versus 2,57 for the VAZ-2106). On vehicles with a contact ignition system and with an additional resistor in the primary circuit of the coil, the positive wire should be connected to the VK-B terminal (with M4 thread) of the coil.

Literature

Sidorchuk V. Electronic octane corrector. - Radio, 1991, No. 11, p. 25,26.
Adigamov E. Refinement of the octane corrector. - Radio, 1994, No. 10. p. 30, 31.
Adigamov E. Improvement of the octane corrector. - Radio, 2000, No. 9, p. 44,45.

Author: E.Adigamov, Tashkent, Uzbekistan

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