Electronic Ignition System is a advance ignition system, it produces higher voltage than the conventional ignition system.this system generate much stronger sparks which is needed to spark the lean mixture . conventional ignition system produces 10-15 kv to ignite the mixture. But now a days the scenario has been changed,modern high speed engine needed 15-30 kv to ignite the mixture .
In this system the transistor play very important role. A transistor has ability to switch large amount of current without the use of moving parts.The transistor make use of semi conductor and the most common material used for semi conductor is germanium (antimony material added) because its border line acts as good insulator.
Usually PNP transistor is used in the automotive ignition system.If the transistor is consist of 2 section of "P"and one section"N", then it is called PNP transistor.
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| AutoExpose |
The basic parts of transistor are , Base,Emitter and Collector,denoted by B,E and C respectively.
The electronic ignition system have two circuit, primary circuit and secondary circuit , secondary circuit is same as that of the conventional ignition system.
Electric source is supplied to the E-B circuit and E-C circuit. The base current is only a fraction of the collector current, but the collector current can not exist without the base current.if the current flow in the base circuit is interrupted , causes disturbance of large current flow in the collector circuit.
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| Chevythunder |
The collector is connected to primary winding in the ignition coil and the emitter is grounded. when the cam operates,the primary circuit current is disturbed , thereby induces high voltage in the secondary voltage that is used to ignite the lean mixture at the right time in combustion chamber.
Advantages
- System can work with or without condenser.
- smooth engine operation.
- More horse power.
- There is no wear on contact set and no points bounce.
- Reduce power loss and fuel consumption.
- Contact points carry small amount of current compare to conventional ignition system.
Disadvantages
- Require regular adjustment to compensate wear.
Also Read How Magneto Ignition System works
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