Motorola GM1200E Руководство по установке - Страница 27

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3.0

Operation of a Conventional Ignition System

To effectively reduce ignition interference in a vehicle, it is well to understand the operation of an

automobile ignition system.

Ignition is necessary in a gasoline engine to ignite the gasoline vapour and the air mixture in its

cylinders. The system is made up of the battery, distributor, breaker points, coil, condenser, and

spark plugs. The battery is the only electrical source of power in an automobile, so the lower battery

voltage must be stepped up to the high voltage necessary to arc across the spark plug electrodes.

This arc ignites the gas mixture.

In the conventional ignition system (Figures 2-2) a mechanical circuit breaker (the cam and points in

the distributor) opens the primary circuit of the ignition coil, and high voltage is developed at the

secondary. This high voltage is synchronized and applied to each spark plug by the distributor.

Ignition

Switch

Battery

Figure 2-2 Typical Vehicular Ignition System, Simpliﬁed Schematic Diagram.

The battery is connected to the primary winding of the coil through the ignition switch. The primary

circuit is returned to the battery through the breaker points, which are bypassed by the condenser.

The points are normally closed. As the cam shaft is rotated by the engine, its lobes or corners open

and close the points in proper synchronisation with the piston in each cylinder.

Reducing Noise Interference in Mobile Two-Way Radio Installations

Breaker

Points

Cam

Condenser

Breaker

Ignition

Points

Switch

Cam

Battery

Operation of a Conventional Ignition System

HV Lead

Distributor

Ignition

Coil

Rotor Gap

Ignition

Coil

Stray

Capacitance

Condenser

Spark plug

leads

Spark

plugs

Lead Inductance

Spark Plug Gap

2-3