Car Systems Overview

Overview

This lecture provides an overview of the major systems and components that make up a car, explaining the function and structure of each.

Main vehicle systems include body and frame, engine, transmission, suspension, wheels and tires, control systems, and electrical systems.
Climatic equipment and other engine subsystems are also parts of a car.

The body provides space for the driver, passengers, and cargo.
The frame is the supporting structure for all other components.
Unibody construction combines body and frame; most modern cars use this, while body-on-frame is rare and seen mainly in SUVs.

The engine converts fuel into mechanical energy to propel the car.
The internal combustion engine (ICE) is common; it uses gasoline or diesel and operates through intake, compression, power, and exhaust strokes.
Engine subsystems include intake, exhaust, fuel supply, and cooling systems.
Engine power is sent to the transmission system via a flywheel.

The transmission connects the engine to the drive wheels and manages torque transfer.
Manual transmissions require gear shifting by the driver; automatic transmissions shift gears automatically.
Types of drive: front-wheel drive (FWD), rear-wheel drive (RWD), and all-wheel drive (AWD).
FWD transmissions include clutch, gearbox, final drive, and differential in one housing.
RWD uses a propeller shaft; AWD includes a transfer case and duplicated differentials.

Suspension, wheels, and tires absorb road bumps and improve safety and comfort.
Wheels are made from various materials and paired with air-filled tires.
Suspension includes wheel hub, coil spring, shock absorbers, arms, anti-roll bar, subframe, and bushings.
Common front suspension: MacPherson struts; rear: semi-independent with torsion bar.

Control systems include steering (changes direction), braking (slows/stops car), engine control (alters torque), and transmission control (disconnects/selects gears).
Modern cars feature various mechanical and electronic controls.

Electrical systems store, generate, transmit, and use electricity.
Divided into power sources (battery, generator), power consumers (headlights, starter, control unit), wiring, and auxiliary elements (relays, fuses, switches).

Unibody — construction integrating body and frame into one structure.
Internal Combustion Engine (ICE) — engine using fuel combustion to create mechanical energy.
Transmission — system transferring power from engine to drive wheels.
MacPherson Strut — a common front suspension design using a combined shock absorber and coil spring.
Control Systems — systems for steering, braking, and managing engine/transmission operations.