Electronic ignition system. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Electronic ignition system. 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 electronic ignition system is designed for installation on cars with a contact ignition system. It has the following advantages: spark power is 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 smoothly turns off without a spark.

The power of the spark in this circuit depends on the temperature of the transistor VT2: it decreases on a hot engine, increases on a cold one, making it easier to start.

Electronic ignition system

When opening and closing the contacts of the breaker SK, the pulse passes through C1, briefly opening VT1 and VT2. When VT2 is closed, a spark occurs. Capacitor C2 smooths out the peak of the voltage pulse. Resistors R6 and R5 limit the maximum voltage at the collector VT2. When the contacts of the breaker are open, VT1 and VT2 are closed, with permanently closed contacts, the current through C1 gradually decreases, VT1 and VT2 close smoothly, protecting the ignition coil from overheating.

The R6 value is selected for a specific ignition coil (in the diagram it is indicated for the B115 coil), for B116 the value of R6 \u11d XNUMX kOhm.

For this coil, it is better to use the KT2A transistor as VT898.

See other articles Section Automobile. Ignition.

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