Lesson Notes By Weeks and Term v4 - SHS 3
INTRODUCTION TO VEHICLE TECHNOLOGY
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INTRODUCTION TO VEHICLE TECHNOLOGY
Download the Lessonotes Mobile Ghana app for faster lesson access on Android and iPhone.
Subject: Applied Technology
Class: SHS 3
Term: 1st Term
Week: 7
Grade code: 3.1.2.LI.3
Strand code: 1
Sub-strand code: 2
Content standard code: 3.1.2.CS.1
Indicator code: 3.1.2.LI.3
Theme: AUTOMOTIVE TECHNOLOGY
Subtheme: INTRODUCTION TO VEHICLE TECHNOLOGY
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Welcome, future technicians and engineers! Look at the cars on our roads today in Accra, Kumasi, or even your local town. They are very different from the cars our parents drove. They are no longer just simple machines of metal and rubber; they are smart machines controlled by computers. Understanding the basics of automotive electronics is like learning the language these modern cars speak. This knowledge is essential not just for fixing them, but for driving them efficiently, buying a good "home-used" car, and understanding the future of transportation in Ghana. Today, we will demystify the "brain" and "nerves" of a modern vehicle.
A. Introduction to Automotive Electronics
Think of a simple light switch in your house. That's an electrical circuit. It's either ON or OFF. Now think of your smartphone. It takes your touch (input), processes it, and opens an app (output). That is an electronic circuit. It makes decisions. Modern cars are full of electronic circuits that make them smarter, more efficient, and safer.
The key players in this system are: Sensors (The Nerves): These devices gather information about the car and its environment. They "feel," "see," and "hear" for the car's brain. Example 1: Coolant Temperature Sensor: Measures how hot or cold the engine's coolant is. This tells the brain if the engine is warmed up. Example 2: Crankshaft Position Sensor: This is one of the most important sensors. It tells the brain the exact position and rotational speed of the engine's crankshaft. Without this, the engine won't know when to create a spark or inject fuel. Example 3: Oxygen (O2) Sensor: Located in the exhaust pipe, it measures the amount of unburnt oxygen in the exhaust gas. This tells the brain how well the fuel is burning. Actuators (The Muscles): These devices receive commands from the brain and perform a physical action. Example 1: Fuel Injectors: These are electronically controlled valves that spray a precise amount of fuel into the engine, as commanded by the brain. Example 2: Ignition Coils: These receive a signal from the brain to generate a high-voltage spark at the spark plug at the exact right moment. Example 3: Idle Air Control (IAC) Valve: This small motor controls the amount of air entering the engine when your foot is off the accelerator pedal, keeping the engine from stalling at idle. Engine Control Unit (ECU) / Engine Control Module (ECM) (The Brain): This is a small but powerful computer, usually housed in a protective metal box. Its job is to: Receive signals from all the sensors. Process this information using pre-programmed logic (a map). Send precise commands to the actuators.
This entire network of the brain, nerves, and muscles working together is called the Engine Management System (EMS).