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Modern Ignition System: Modern ignition systems use electronic circuits. The ability of a transis tor to interrupt a circuit carrying a relatively high current makes it an ideal  replacement for the breaker points and condenser. In modern automobiles the following two types are in  common use. (i) Transistorized coil ignition system (TCI system) (ii) Capacitive discharge ignition system (CDI system) Transistorized Coil Ignition (TCI) System: In automotive applications, the transistorized coil ignition systems which pro vide a higher output voltage and use electronic triggering to maintain the  required timing are fast replacing the conventional ignition systems. These  systems are also called high energy electronic ignition systems .  When the transistor is ON, current passes through the primary side of the ignition coil (coil hereinafter) from the battery to store the energy. And when the transistor is OFF, the current is shut off causing a sudden change in ...

  Comparison between battery ignition and magneto ignition system: Battery Ignition System Magneto Ignition System Battery is necessary. Difficult to start  the engine when battery is discharged. No battery is needed and there- fore there is  no problem of battery  discharge. Maintenance problems are more due  to battery. Maintenance problems are less, since  there is no battery. Current for primary circuit is ob tained from the battery The required electric current is gener ated by the magneto. Commonly employed in cars and light  commercial vehicles. Mainly used in racing cars and two  wheelers. A good spark is available at the spark  plug even at          low  speed. During starting, quality of spark is  poor due to low speed.  Efficiency of the system decreases  with the reduction in spark intensity  as engine speed rises. Efficiency of the system improves as ...

MAGNETO IGNITION SYSTEM Magneto is a special type of ignition system with its own electric generator to provide the necessary energy for the system. It is mounted on the engine and replaces all the components of the coil ignition system except the spark plug. A magneto when rotated by the engine is capable of producing a very high voltage and it does not need a battery as a source of external energy. The high tension magneto incorporates the windings to generate the primary voltage as well as to step up the voltage and thus does not require a separate coil to boost up the voltage required to operate the spark plug. Magneto can be either rotating armature type or rotating magnet type. In the first type, the armature consisting of the primary and secondary windings all rotate between the poles of a stationary magnet. whilst, in the second type the magnet revolves and the windings are kept stationary. A third type of magnet to called the polar inductor type is also in use. In the polar in...

Components of Battery Ignition System: (i) battery (ii) ignition switch (iii) ballast resistor (iv) ignition coil (v) contact breaker (vi) capacitor (vii) distributor (viii) spark plug (1.)  Battery: To provide electrical energy for ignition, a storage battery is used. It is charged  by a dynamo driven by the engine. Owing to the electro-chemical reactions, it is able to convert the chemical energy into electrical energy.   Two years or more trouble- free life may be obtained from a battery. A lead acid battery consists of a number of cells connected together in  series and each having a nominal potential of 2 volts when fully charged. A  six volt battery has three such cells and a 12 volt battery has six. how six cells are coupled together to form a 12 volt battery and  shows that for this coupling in series the positive of one cell is connected to  the negative of the next in Figure. Two types of batteries are used for spark-ignition engines, ...

  Battery ignition system Most of the modern spark-ignition engines use battery ignition system. In this system, the energy required for producing spark is obtained from a 6 or 12 volt battery.  The construction of a battery ignition system is extremely varied.  It depends on the type of ignition energy storage as well as on the ignition performance which is required by the particular engine.  The reason for this is that an ignition system is not an autonomous machine, that is, it does not operate completely by itself, but instead it is but one part of the internal combustion engine, the heart of the engine. Passenger cars, light trucks, some motorcycles and large stationary engines are fitted with battery ignition systems.  The components of the system are: (i) battery (ii) ignition switch (iii) ballast resistor (iv) ignition coil (v) contact breaker (vi) capacitor (vii) distributor (viii) spark plug WORKING OF A BATTERY IGNITION SYSTEM:   The source of th...