Automobiles are vehicles that use an internal combustion engine to move. They are made of many systems that work together to make the car run smoothly and safely.

The engine is the heart of an automobile, and it is comprised of pistons, cylinders, tubes to deliver fuel to the cylinders, and other components. The engine makes the car move, and it helps to reduce noise and pollution by circulating coolant fluid (mostly water), lubricating oil, and fuel.

Another important system is the transmission, which moves the power from the engine to the wheels. This system includes gears, which change the speed and torque of the engine.

There are several types of transmissions, including fluid coupling. A fluid coupling is similar to a clutch, and it uses a working fluid to transmit motion between the driving shaft and the driven shaft.

Besides the engine, other systems of an automobile include a battery ignition system, a spark plug, a radiator for cooling the engine, a clutch, and a gear shift. Some of these systems are very complicated, and it is necessary for an auto engineer to understand them before designing a vehicle.

The first car was invented in 1885 by Karl Benz. He built a car with a gasoline-fueled engine and patented it on 29 January 1886. Benz also invented a car accelerator for speed regulation and a battery ignition system. He started selling his cars in 1888. Eventually, other engineers in Germany and France began building cars with their own designs and patented them.