Electronic ignition. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Automobile. Ignition
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The proposed scheme (Fig. 1) is intended for installation on vehicles with a contact ignition system.
(click to enlarge)
It has the following advantages:
- spark power increased;
- breaker contacts do not burn;
- no resistor is needed in the ignition coil circuit;
- when the ignition is on, but the engine is not running, the circuit turns off smoothly, without a spark.
The power of the spark in this circuit depends on the temperature of VT2, and it decreases on a hot engine, and increases on a cold one, thereby facilitating starting.
When closing and opening the contacts of the breaker SK, the impulse passes through C1, briefly opening VT1 and VT2. When VT2 closes, a spark occurs. C2 smooths out the peak of the voltage pulse. R6 and R5 limit the maximum voltage on the VT2 collector. When the desired voltage is reached, VT2 opens slightly, limiting further voltage growth.
The opening voltage VT2 depends on the value of Ube which, in turn, depends on the temperature. When the contacts of the breaker are open, VT1 and VT2 are closed. With long-closed contacts, the current through C1 gradually decreases, respectively, and VT1 and VT2 close smoothly, protecting the ignition coil from overheating.
Details: C1 - type KM or K73. R6 provides output voltage stabilization. Its value is selected for a specific ignition coil. In the diagram, the value of R6 is indicated for the B115 coil. Its main parameters are: Ri=1.6 Ohm, I<8A, Ui<330 V. Transformation ratio K=68. For coil B116 (Ri=0,6 ohm, Ii<20 A, Ui<160 V, K=154) R6=11 k. For this coil, it is better to use KT2A transistors as VT898.
To improve the reliability of the circuit, it is better to use a composite transistor VT2, as shown in Fig. 2.
Author: P. Bryantsev, Tyumen region, Uvatsky district, village of Ivanovka; Publication: N. Bolshakov, rf.atnn.ru
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