Automobile starting System: Self start system [with Pdf]

What is Self start system?

Self Start System is the method of rotating the crankshaft with the help of a starter motor to start the engine. The Starter motor helps to rotate the crankshaft, which allows to reciprocate the piston inside the cylinder to start Engine.

In this system, less effort requires to start the engine as compared to the kick start system.

Starting system diagram:

Self start system

Construction:-

Self Start System is consists of a starter motor, Ignition Switch, Solenoid, Plunger, Lever Fork, Battery and Solenoid.

1) BATTERY:- Battery supplies the power to the Starter Motor.

2) IGNITION SWITCH:- Ignition switch is used to Connect or Disconnect the Connection between Battery & Solenoid.

Therefore When Ignition Switch is on, The Current flows from the Battery to Solenoid therefore Solenoid gets energized.

3) PLUNGER:- It is located inside the Solenoid.   When Current flows from Battery to Solenoid Creates the magnetic field, Solenoid pushes the Plunger from Left to Right.

The plunger has a contact point on the Right end. Therefore, When Plunger moves from Left to Right, Contact mades between Contact Point & Point 1 & Point 2. Therefore the current flows from the Battery to Motor.

4) LEVER FORK:- One end of the Lever fork is connected to the Plunger & Another end is Connected to the Motor Shaft.  Liver Fork is Pivoted at the middle part.

Therefore, Due to Plunger movement from Left to Right, Liver Fork pushes the Pinion to Forward to mesh with the Flywheel.

5) SOLENOID:- It is Electromagnet, Winding is used inside the Solenoid. When Current passes through the winding, it generates a Magnetic field.

Therefore When flows from the battery to Solenoid, Solenoid pushes the piston Left to Right.   Return spring is used inside the Solenoid. therefore when the ignition switch gets off, Plunger comes to its original position.

6) STARTING MOTOR:- It is DC Motor, has Pinion on the Motor shaft End to mesh with Flywheel.   The battery supplies the current to the Motor.  

How self start system works?

1) When the driver switches on the ignition switch, First Current flows from the Battery to Solenoid therefore Solenoid gets Energized & Push Plunger from Left to Right.

2) Then, Due to Plunger movement from Left to Right, Liver Fork pushes the Pinion to Forward & Contact mades between Contact Point & Point 1 & Point 2. Therefore the current flows from the Battery to the Motor.

3) Hence, the Motor Starts Rotating. Resulting in Pinion Starts Rotating & Rotates the Flywheel.

Advantage of self start system:

  • Less Effort Required.

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