To understand the construction and working of a battery ignition
To locate and identify parts of a battery ignition system.
To know the application, merits and demerits of a battery ignition
It consists of the following parts:
Battery(Lead Acid type)
Stores the Electrical Energy.
Charges using the Dynamo
driven by the engine
Helps in turning the
system ON or OFF
Under prolonged conditions it
helps to maintain the
temperature of Ignition Coil
Steps up the Low Voltage to High
Voltage to induce an electric spark
in the spark plug.
Making and breaking
the primary circuit.
Prevents the burning and possible
welding of metal points.
Distributes the Ignition surge to
individual spark plugs.
Creates the spark
due to ionisation
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
Due to this, the condenser then discharges into the battery, thus
reversing the direction of both primary current and magnetic
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.
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
More power output.
More fuel efficiency
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
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.
It is used in all S.I. engines used in modern vehicles.
It is used in engines in industries which requires sparking for
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