Systema de ignicion en ingles

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  • Publicado : 3 de mayo de 2010
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Three types of systems have been used in modern times:
We will discuss them all, but the one we will deal with in the greatest detail, is the breaker point system. The way they create the high voltage spark is the same in all types of systems, the only thing that differs is the way they are controlled.
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All ignition systems have two circuits;
The Primary Circuit
Theprimary circuit is the low voltage circuit that controls the ignition system.
The primary circuit consists of:
The Secondary Circuit
The secondary circuit is the circuit which converts magnetic induction into high voltage electricity to jump across the spark plug gap, firing the mixture at the right time.
The Secondary Circuit consists of:
Electrical Terms and Principles
Terms;A Circuit is the continuous path that the electricity goes through. It must be complete from the source, to the switch, to the load, and back to the source again.
Ground is the part of the circuit which is not wires, but a part of the car's metal body. This is almost always the negative side of the battery.
Voltage is the electrical pressure that makes electrons move through awire. High voltage requires lots of insulation to prevent electrons leaking to ground. An example of a high voltage circuit, is the secondary circuit. Voltage is measured in volts. An ignition system can produce as much as 45,000 volts, a battery, 12 volts.
Current is the actual amount of electrons flowing. Large amounts of current require lots of copper to travel through. An example of acircuit with a large amount of current, is the cables from the battery to the starter. Current is measured in amperes, or amps for short. A starter can draw 200 amps, an ignition system, less than 5 amps.
Resistance is the opposition to current flow, and is measured in ohms.
Magnetic Field can best be described by imaginary lines of force between one pole of the magnet and the other.{draw:frame}
Principles
When electricity flows through a wire, a magnetic field is built up around the wire.
When a wire passes through magnetic lines of force, cutting them, a voltage is induced in the wire.
Three things are needed to produce electricity:

Magnetic Field
2. Circuit - a path for the electricity to go through.
3. Motion - either the wire,or the magnetic field, has to move.
...So, How Does The Ignition System Work Anyway?
Electrons, supplied by the battery when the engine is starting, or by the alternator when the engine is running, are supplied to the primary circuit at about 12 volts electrical pressure. When the circuit is completed by turning on the ignition switch, and the breaker points are closed, those electronsflow through the primary coil, across the points to ground, and back to the battery again.
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When electrons flow through a wire, a magnetic field is built up around the wire. Make the wire into a coil, and the magnetic field increases by the number of loops in the coil. This magnetic field takes a relatively long period of time to build up. It isn't instantaneous. The time thecoil is charging up is called coil saturation, and is controlled by the amount of time the breaker points are closed, or "dwell". the longer the points are closed for, the longer the dwell, and the stronger the magnetic field becomes.
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The coil is actually named wrong. It shouldn't be called the coil. It should be called the "coilS". The primary coil is the one that builds up themagnetic field. It has a few hundred turns of relatively large wire in it.. The secondary coil has a few thousand turns of small diameter wire in it because it is the one that will make the high voltage, but low current, and fire the spark plugs.
So when the points are closed and the ignition switch is turned on, a magnetic field is built up around the coil. When the points are opened by the...
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