Friday, 20 July 2018

Thursday, 19 July 2018

IGNITION SYSTEM

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Description of Ignition System

 The three basic elements in a gasoline engine are: a mixture of good fuel air, good compression, and a good spark.
The ignition system produces a strong spark through the correct ignition timing to ignite the fuel-air mixture.
1. A strong spark 
In an ignition system, sparks (sparks) are generated between spark plug electrodes and to burn the mixture. Because even air has resistance to electricity, when compressed strongly, tens of thousands of volts must be generated to ensure enough spark to ignite the fuel-air mixture.
2. Good ignition timing 
The ignition system should provide sufficient ignition time at all times to accommodate changes in machine and machine load. 
3. Adequate endurance 
The ignition system should be able to provide sufficient reliability to withstand vibrations and heat generated by the engine

The ignition system uses the high voltage generated by the ignition coil to produce sparks, to ignite the mixed air-fuel mixture.
The mixture is compressed and diba-kar inside the cylinder. This pemba karan resulted in the motion of the engine.
Through its own induction and mutual induction, the coil produces the high strain required for ignition. The pri-mer coil generates a few hundred volts and the coiled coil produces tens of thousands of volts.

Development of Ignition System

  Here are some types of ignition systems:
1. Breaker point type
This type of ignition system has the most basic construction.
 With this type, the primary current and ignition timing are mechanically controlled.
 The primary stream of the ignition coil is arranged to flow intermittently through a breaker point or platinum contact point (usually called platinum).
 Governor advancer and vacuum advancer control the ignition timing.
 Distributors distribute the high voltage generated by the secondary coil to the spark plugs. 

 HINT:
 In this type, the breaker point must be set or replaced periodically. 
External resistors are used to reduce the number of primary coil windings, improve the primary current increase, and minimize the reduction of secondary voltage at high speed.
 Reducing the number of primary coil windings means reducing the resistance, raising the primary current, and raising the heat generation. For this reason, external resistors are provided to prevent the mainstream from rising excessively.
2. Type of transistor
In this type, the transistor controls the primary current so that it flows intermittently in accordance with the electrical signals generated by the signal generator.
 The timing advance is mechanically controlled in the same way as in the breaker point type.
3. Type of Transistor with ESA (Electronic Spark Advance)
The use of mechanical advancer vacuum and governor advancer has been discontinued in this type. Furthermore, ESA plays together ECU machines controlling ignition timing.
4. DIS (Direct Ignition System)
This type uses multiple ignition coils to supply high voltage directly to the spark plugs. The ignition timing is controlled by the ESA function on the ECU engine. This system is dominating the current gasoline engine.


HINT:
Type 2 simulates two cylinders simultaneously.
 One spark jump appears in the compression step (compression stroke) and the other in the exhaust stroke (exhaust stroke).


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