Sylvie Willis
Cars are machines that convert the energy locked in fuel into mechanical energy to power wheels and gears. This process is known as internal combustion. During combustion, the fuel is ignited and converted into exhaust, which is released through the exhaust outlet. The exhaust gases produced contain carbon dioxide, which is a major cause of global pollution.
| Characteristics | Values |
|---|---|
| Energy released | Mechanical energy, kinetic energy |
| Fuel used | Gasoline/petrol, diesel, biofuel, electricity |
| By-products | Exhaust, carbon dioxide, heat |
| Fuel system components | Fuel pump, fuel tank, fuel filter, fuel injectors, spark plugs |
| Combustion cycle | Intake, compression, combustion, exhaust |
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What You'll Learn
Carbon dioxide is released
The internal combustion process involves bringing air and fuel into the engine, where it is compressed and ignited by a spark plug. The resulting explosion forces the piston down, and the exhaust valve opens to release the waste gases. These gases are cleaned by a catalytic converter before exiting the vehicle through the tailpipe.
The fuel itself is typically gasoline, also known as petrol, which is a blend of hydrocarbons refined from crude oil. Gasoline is a clear, flammable liquid that powers the majority of cars, trucks, vans, SUVs, boats, and motorcycles. Diesel is the second most common type of vehicle fuel and is also derived from crude oil.
The process of converting gasoline into motion involves releasing energy from the fuel, which is then converted into mechanical energy to power the wheels and gears of a vehicle. This energy conversion allows a car to move forward and can be thought of as similar to how the human body converts food into energy for movement.
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Energy is converted to motion
The internal combustion process in a car engine consists of four strokes: intake, compression, combustion, and exhaust. During the intake stroke, the intake valve opens, allowing air and fuel to enter the engine. The piston then moves up during the compression stroke, pushing the air and fuel mixture into a smaller space. This creates a more powerful explosion.
In the combustion stroke, a spark plug ignites the fuel-air mixture, creating an explosion that forces the piston back down. The energy from this explosion is harnessed and used to propel the car. As the crankshaft turns, the piston is forced back up the cylinder, releasing exhaust gases through the exhaust outlet during the exhaust stroke.
The whole cycle then repeats, with the crankshaft continuously powered by the cylinders. Cars typically have multiple cylinders arranged to fire out of step with one another, ensuring that at least one cylinder is always powering the crankshaft and maintaining a constant power output. This conversion of energy from the fuel into motion enables the car to move forward, converting the chemical energy stored in the fuel into kinetic energy that propels the vehicle.
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Fuel is mixed with air
In a car's combustion engine, fuel is mixed with air in the piston chambers. This mixture is then ignited, either by a spark plug or by the piston compressing the chamber. This combustion process converts the fuel to energy, which is used to propel the vehicle. The exhaust gases produced are then forced out through the exhaust outlet.
The process of mixing fuel with air differs depending on the type of engine. In the past, vehicles used carburetors to create the right mixture of air and fuel for combustion. Carburetors use the pressure created by the suction of the engine to bring in air. However, this method was not entirely reliable with fluctuating RPMs.
Today, most vehicles use electronic fuel injection, which is controlled by the Electronic Control Unit (ECU). This system uses a fuel pressure regulator to maintain a specified amount of fuel pressure. The injectors, based on calculations from the Mass Air Flow (MAF) sensor, observe how much air enters the engine. This allows the ECU to calculate and determine the optimal fuel-to-air ratio. The fuel is then injected into the combustion chamber in the form of a mist.
It is important to ensure that the fuel entering the engine is uncontaminated and free from dirt or particulates. A fuel filter helps to remove these impurities, and it should be replaced every 60,000 miles to maintain optimal performance. Additionally, a fuel system cleaning is recommended every 30,000 miles to ensure the vehicle continues to burn fuel properly.
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Fuel is ignited
For a car to run, its engine needs a few things: fuel, air, spark, and compression. The fuel, usually gasoline, is mixed with air in the engine's cylinders. Air is necessary for the engine to run as it helps ignite the fuel. The spark, created by the ignition system, ignites the air-fuel mixture in the cylinders and starts the engine's pistons moving.
The ignition system creates the spark needed to start the engine. It comprises components like spark plugs and coils, generating high voltage to spark combustion. The spark plugs are situated in each cylinder of the engine and are responsible for setting fire to the fuel and air mixture inside the cylinder. The ignition coil takes the low voltage from the battery and transforms it into the high voltage necessary to produce a spark. The ignition coil consists of two coils of wire wrapped around an iron core. The high voltage from the ignition coil is sent to the spark plugs, creating a spark that ignites the fuel and air mixture.
The engine's combustion chamber must be airtight and open enough to allow for the release of air and fuel. The fuel is combusted in the cylinder to create energy. The expanding gases from the burning mixture push the pistons, which in turn rotate the crankshaft.
Pre-ignition in a spark-ignition engine describes when the air-fuel mixture in the cylinder ignites before the spark plug fires. This can be caused by an ignition source other than the spark, such as hot spots in the combustion chamber, a spark plug that is too hot, or carbon deposits in the combustion chamber heated by previous engine combustion events. Pre-ignition can also be caused by too much air or too little fuel, which can lead to the spark plug electrode and other components becoming very hot and eventually causing pre-ignition.
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Fuel is injected
Fuel is essential to a car's engine and is vital to the combustion process. The process of converting gasoline into motion is called "internal combustion". During this process, fuel is injected into the combustion chamber, where it is combined with air and ignited by a spark plug, creating an explosion. This releases energy that powers the crankshaft, which in turn powers the car's wheels and gears.
In the past, vehicles used carburetors to create the right mixture of air and fuel for combustion. However, this method was not entirely reliable with fluctuating RPMs. Today, most vehicles use electronic fuel injection, which is controlled by the Electronic Control Unit (ECU). This system uses a fuel pressure regulator to maintain a specified amount of fuel pressure, allowing the injectors to spray a mist of fuel into the combustion chamber. The ECU calculates how much fuel is needed based on data from the Mass Air Flow (MAF) sensor, which measures the amount of air entering the engine. This ensures an optimal fuel-to-air ratio, improving fuel efficiency and performance.
The fuel injection system requires regular maintenance to keep the vehicle running optimally. It is recommended to replace the fuel filter every 60,000 miles and to perform a fuel system cleaning every 30,000 miles. This includes an engine de-carbon process, which breaks up the varnish in the engine, improving the atomization of fuel. Additionally, cleaning the needle of the injector and removing any pooled or puddled fuel collected on the tops of injectors can enhance the spray pattern, resulting in better fuel utilisation.
The combustion of fuel in car engines releases energy, powering the vehicle, but it also produces exhaust gases and waste products like carbon dioxide (CO2). The challenge in designing car engines is to maximise the energy extracted from each drop of fuel, improving efficiency and reducing the environmental impact of the carbon emissions produced.
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Frequently asked questions
A car releases carbon dioxide when it burns fuel.
Fuel is converted to energy to propel the vehicle.
The process is called "internal combustion".
The fuel tank stores fuel until it is needed by the engine.
Gasoline is the most common type of vehicle fuel.
