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ASEMINAR ON
BATTERY IGNITION SYSTEM
Index
Objective Construction Working Advantages Disadvantages Applications Conclusion
Objectives
To understand the construction and working of a battery ignition
system.
To locate and identify parts of a battery ignition system.
To know the application, merits and demerits of a battery ignition
system.
Construction
It consists of the following parts:Battery(Lead Acid type) Stores the Electrical Energy. Charges using the Dynamo
driven by the engine
Ignition switch Helps in turning the
system ON or OFF
Ballast Resistor Under prolonged conditions it
helps to maintain the temperature of Ignition Coil
Ignition coil Steps up the Low Voltage to High
Voltage to induce an electric spark in the spark plug.
Contact breaker Making and breaking
the primary circuit.
Capacitor Prevents the burning and possible
welding of metal points.
Distributor Distributes the Ignition surge to
individual spark plugs.
Spark plug Creates the
spark due to ionisation of gap
Working Ignition switch is turned on, the current starts flowing through
primary circuit. This current sets up a magnetic field around the soft iron core of the ignition coil.
When the breaker points opens, the current which was flowing through the contact breaker starts flowing through the condenser
As the condenser charges, the primary current falls and the magnetic field collapses.
This change in the magnetic field induces a current in the primary winding which flows in the same direction as the primary current and changes the condenser to a voltage much higher than battery voltage thus stooping the current flow from the battery.
Due to this, the condenser then discharges into the battery, thus
reversing the direction of both primary current and magnetic
field.
This rapid collapse and reversal of the magnetic field induces a
very high voltage in the secondary winding of the ignition coil.
This high voltage is then carried through the high tension
wires to the distributor rotor, where it passes through one of
the ignition harnesses into the spark plug and produces a spark.
CONTINUED..
Advantages Moving parts are absent-so no maintenance. Contact breaker points are absent-so no arcing. Spark plug life increases by 50% and they can be used for about
60000 km without any problem. Better combustion in combustion chamber, about 90-95% of air fuel
mixture is burnt compared with 70-75% with conventional ignition system.
More power output. More fuel efficiency
Disadvantages Because of arcing, pitting of contact breaker point and which will
lead to regular maintenance problems.
Poor starting: After few thousands of kilometres of running, the
timing becomes inaccurate, which results into poor starting (Starting
trouble).
At very high engine speed, performance is poor because of inertia
effects of the moving parts in the system
Sometimes it is not possible to produce spark properly in fouled
spark Ignition Systems plugs.
Application
It is used in all S.I. engines used in modern vehicles.
It is used in engines in industries which requires sparking for
combustion.
Conclusion
Ignition system is very important component of a vehicle.
It harnesses the energy of collapsing magnetic field.
Condenser is used to create voltage much higher tan the
battery voltage.
ANY QUESTIONS?