What Is Charged By The Exciter Coil In A Capacitor Discharge Ignition System

4 min read Jun 26, 2024
What Is Charged By The Exciter Coil In A Capacitor Discharge Ignition System

Capacitor Discharge Ignition System: Understanding the Role of the Exciter Coil

A capacitor discharge ignition (CDI) system is a type of ignition system commonly used in vehicles, particularly in two-wheelers and small engines. The system is known for its high voltage output, rapid spark generation, and improved engine performance. In this article, we will delve into the role of the exciter coil in a CDI system and explore what is charged by the exciter coil.

What is a Capacitor Discharge Ignition System?

A CDI system consists of several components, including a battery, a capacitor, an exciter coil, an igniter, and a spark plug. The system works by storing electrical energy in the capacitor and then discharging it rapidly to create a high-voltage spark in the spark plug, igniting the fuel mixture in the engine.

The Role of the Exciter Coil

The exciter coil is an essential component in a CDI system, responsible for generating a high-voltage pulse to charge the capacitor. The exciter coil is a type of transformer that steps up the voltage from the battery to a higher level, typically in the range of 300-400 volts.

How the Exciter Coil Works

The exciter coil works by using a low-voltage input from the battery to generate a high-voltage output. This is achieved through the principle of electromagnetic induction, where a changing magnetic field induces an electromotive force (EMF) in the coil.

When the ignition system is turned on, the exciter coil receives a low-voltage input from the battery. This input current flows through the primary winding of the coil, generating a magnetic field. The magnetic field then induces a high-voltage EMF in the secondary winding, which is connected to the capacitor.

What is Charged by the Exciter Coil?

The exciter coil charges the capacitor to a high voltage level, typically in the range of 300-400 volts. This high-voltage charge is stored in the capacitor until the ignition system is triggered, at which point the energy is rapidly discharged through the igniter and spark plug, creating a high-voltage spark that ignites the fuel mixture in the engine.

In summary, the exciter coil in a CDI system plays a critical role in generating a high-voltage pulse to charge the capacitor. The capacitor is then discharged rapidly to create a high-voltage spark in the spark plug, igniting the fuel mixture in the engine. The exciter coil is an essential component in the CDI system, enabling the system to generate the high-voltage output required for efficient engine operation.