Lesson 2:Starting system baSIc fundamentals
Lesson 2:Starting system baSIc fundamentals
Embedded Files
Learning objectives:
Learning objectives:
at the end of the lesson you must be able to:
at the end of the lesson you must be able to:
Define the purpose and function of the starting system in an internal combustion engine.
Value the importance of safety procedures when handling electrical components.
STARTING SYSTEM
STARTING SYSTEM
Battery provides the current to turn the starter motor.
Fuse protects the circuit.
Ignition switch closes the circuit
Relay uses small amount of current to control large amount
Neutral safety switch opens the circuit until the vehicle is in neutral
(manual transmission), or park (Automatic). (Can be adjusted)
Solenoid does the same thing as relay, but performs
mechanical operation. It is an electromagnetic switch.
Starter motor engages pinion gear to ring gear (mounted on flywheel,
Or torque converter).
Starting system uses battery power and an electric DC motor to turn
engine crankshaft for engine starting.
Changes electrical energy to mechanical
Provides gear reduction/torque multiplication (16:1 to 20:1).
When the ignition key is turned on the current flows through the
solenoid coil. This closes the contacts, connecting battery to the
starter motor.
COMMUTATOR sliding electrical connection between the motor
windings and the brushes.
Several loops of wire and a
commutator with many segments
are used to increase motor power
and smoothness.
Insulated from each other
Insulated from each other
BRUSHES ride on top of the commutator to carry battery current
to spinning windings.
Replaced during starter rebuilding
Replaced during starter rebuilding
Starter Armature consists of the armature shaft, armature core,
commutator and armature windings.
Armature must produce high torque and high speeds
Field winding is a stationary insulated wire wrapped in a circular
shape. It creates a strong magnetic field around the motor armature.
Pinion Gear is attached to the starter drive and when starting the vehicle the pinion gear engages with flywheel or ring gear. It is moved by the YOKE.
SUMMARY oF THE TOPIC
SUMMARY oF THE TOPIC
The starting system is an essential component of a vehicle that enables the engine to begin operating. Its basic function is to convert electrical energy from the battery into mechanical energy to crank the engine. When the ignition switch is turned to the "start" position, it activates the starter solenoid or relay, allowing current to flow to the starter motor. The starter motor then engages the flywheel, which is connected to the engine’s crankshaft, causing it to rotate and initiate the combustion process. Once the engine starts running on its own, the starting system disengages automatically. To ensure safety, features like a neutral safety switch are included to prevent the vehicle from starting while in gear. Overall, the system operates through the coordinated function of components such as the battery, ignition switch, starter motor, solenoid, and flywheel.
Basic Starting system fundamentals
Basic Starting system fundamentals
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