Understanding Car Charging System

Contents

Recap

A charging system delivers electrical energy to power the vehicle while it is running and sustains the battery’s charge. It consists of three main parts: battery, alternator, and the voltage regulator. The battery supplies the necessary electrical power to start the engine.

The alternator generates the electrical currents required to run each and every electrical component in the car, while the regulator controls the currents’ voltage. The voltage regulator also keeps the battery charged to its maximum capacity. When the battery is running low, the voltage regulator will signal the alternator to begin charging the battery.

Let’s get into more details!

What is a charging system in a car?

The car charging system is a set of components working to keep a charge and provide electrical energy for the vehicle’s electrical devices. Modern vehicles are now designed with many electrical parts, which makes them require a large amount of electrical energy. The charging system powers the headlights, dashboard indicators, light or warning lamps, fuses, relays, engine plugs, brainbox, ECU, radio, control screen, fuel injector system, sensors, etc. All these components are connected to the car battery which is charged by the alternator.

Functions of Charging System

Below are the functions of the charging system in automobile engines:

  • The primary purpose of the charging system is to provide power to all electrical components in a vehicle.
  • It comprises an alternator that maintains and keeps the vehicle’s battery charged.
  • The charging system supplies electrical current to fire the spark plugs, which ignite the air/fuel mixture in the combustion chamber,
  • Alternators help to charge dead batteries, while the engine is running.
  • The charging system help to send the engine’s mechanical issue to the engine’s ECU using a sensing device.
  • Vehicles’ electrical components are powered when the engine is not running.

More functions will be covered as we explain the components of the charging system.

Components of Engine Charging System

Below are the major parts of the charging system in automobile engines:

Alternator:

An alternator is one of the major and inevitable parts of an automobile charging system as it plays the best role. The electrical power that charges the battery is from the alternator, but the current produced is alternating current (AC).

This AC power is immediately converted to direct current (DC) because automobiles use a 12-volt DC electrical system. A dead battery does not mean there is something wrong with it. it is just that being deprived of charge, this is why the alternator is also checked if a car is not starting.

Voltage Regulator:

The voltage regulator controls the alternator’s power output. Though this device is often located in the alternator, as it regulates the charging voltage that the alternator produces. It keeps the voltage between 13.5 and 14.5 volts to protect the electrical parts in the vehicle.

In modern vehicles that use ECU to sense when the battery needs to be charged as controls the volt supplied. The warning lamp in the dashboard indicates something is wrong with the charging system. Often time the warning lamp is indicating a faulty alternator, resulting in an uncharged battery.

Battery:

The battery is another essential of the automobile charging system, as it serves as a reservoir of electrical power. the engine’s starter motor is directly connected to the positive terminal. It helps to crank the component making the engine start. As the engine is running, the alternator directly charges the battery. The battery can also supply power to the electrical components when the engine isn’t running.

Charging System Diagram:

charging system components

Working Principle

A car charging system begins working when the starter key is in the ignition, at the point the vehicle’s electrical components rely on the battery. As soon as the engine begins working alternator starts supplying power to the components and battery. This is why the battery is charged when the engine is running.

The alternator voltage is less than the battery voltage when the engine is not running. This is because the current from the battery is used to power the vehicle loads and not the alternator. The alternator contains diodes that prevent current from flowing into the alternator.

In a situation where the engine is running, the alternator current output is greater than the battery voltage. The current flow from the alternator to the electrical load in the vehicle and the battery to charge it up. Conventionally, the alternator’s output voltage is above the battery voltage when the engine is working.

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Symptoms of Bad and Failing Charging System

As time goes on you can experience failure in your charging which can be often time caused by its components. below are the symptoms of bad charging in an automobile engine:

Bad Alternator

If the alternator goes bad, the complete charging system won’t work as well. Most time, the voltage regulator is always affected inside the alternator, since it controls the amount of current that flows to the car’s electrical part. Alternators can offer higher voltage output if the regulator fails which can cause a problem to the car battery and components that rely on it. This is because the alternator has no power over the car’s 12-volt system.

On the other hand, a bad voltage regulator can send low voltage output to the car battery and electrical components. with this, the battery is prevented from charging fully and the parts won’t be properly powered. if care is not taken when the alternator goes wrong, the car’s electrical system will be powered by the battery and drain off.

Worn or Broken Belt:

A broken alternator belt causes the system not to work well and the worn belt will often slip. This will cause the voltage regulator to send a low charge to the battery and the electrical system since the alternator is not spinning fast enough.

Bad Battery:

A bad battery is another big cause of a bad and failing battery, a few years of the used battery will stop holding charge. Automobile batteries can normally last two to five years, so you can try remembering how long you’ve used them.

Well, you can get the battery tested which is done for free in some automobile workshops, if it works fine then you can consider checking the connection between the alternator and the battery. Corrosion on the terminals can reduce the conductivity, so consider crabbing off.

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That is all for this article, in which we’ve discussed about a car’s charging system. I hope you enjoyed the reading, if so, kindly comment, share, and recommend this site to other auto students. Thanks!

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