Why Buy a Hybrid?

Today people are not concerned about environmental issues. The campaign for global warming has made it clear that the planet can retaliate due to mankind's abuse. Science and technology have greatly developed over the years at the expense of the earth's natural resources and environment. Pollution is one of the major causes and with the continuing growth of the population; scientists are finding ways to save what is left.

Apart from environmental factors pollution can also greatly affect the health of the general public especially in the suburbs. Gas prices have also soared. Due to this people have turned to hybrid vehicles instead of the conventional four-door and SUV. Hybrid technology has developed greatly in the recent years.

The Hybrid

Hybrid vehicles work primarily by an electric motor powered by a rechargeable battery. It is coupled with an internal combustion engine to help it at high speeds. It also has the ability to recapture energy made from braking.

Full hybrid vehicles have computers on board to determine the best way to conserve energy and fuel. They can move using their batteries alone for power. When the vehicle is idling or coasting the engine is turned off. They can also use a combination of these power sources for efficiency. They split power paths that enable them to switch between using mechanical or electrical power.

Apart from using a different power source these vehicles can also use different fuels. They can use a mixture of petroleum and biofuels. Other hybrid vehicles can also be recharged through a standard electric wall socket.

Hybrid vehicles save on gas which leads to less greenhouse emissions. They have also been noted to reduce noise emissions. The use of electrical power decreases the wear on the engine. Contrary to what some believe their batteries are not hazardous materials and can be recycled. These batteries are also durable and rarely need replacement.

Hybrids are perfect for the suburbs. In this area you don't really need horsepower but gas mileage. Hybrids can recharge themselves when braking and only use the needed power in idle periods such as traffic. In reality you don't really need a huge amount of horsepower when driving around in the city traffic.

These vehicles also contribute to the general health of the public. Emissions don't only contribute to the greenhouse effect but also to respiratory diseases. For now, hybrid vehicles are expensive. The technology is still fairly new in the fuel dependent automobile industry.

The Internal Combustion Engine

Internal Combustion Engine

The engines in vehicles is a rather broad but interesting subject. People may be amazed to know that the ones currently in use today were drawn on several hundreds of blueprints before they were distributed to the market. The present models are the result of over a century worth of brainstorming and experience and will further influence the models of the future.

What is the ICE (Internal Combustion Engine)?

ICE stands for internal combustion engine wherein the combustion of fuel and an oxidizer occurs. The combustion chamber is the space where everything happens causing an exothermic reaction that produces gas at a high pressure and temperature. The expanding hot gases will directly put pressure on solid engine parts causing them to move. Pistons, rotors or the engine itself then begins movement which propels the entire vehicle.

The very first models of the ICE ran on an air/fuel mixture rather than compression. The initial part of the intake stroke sucks or blows in the mixture. Modern ICEs already incorporates in-cylinder compression. The engines were used in a variety of methods and industries like generators, boats, aircrafts and most particularly, automobiles.

The Operation

The internal combustion engine operates using a four-stroke cycle or the Otto cycle. The cycle involves four phases namely: induction, compression, power and exhaust. All of these aim to create an exothermic chemical process to start vehicle propulsion. During induction, oxygen or other oxidizers are introduced into the cylinder to act with the fuel. Compression then begins as the gases start a reaction that continuously increase temperature and pressure within the cylinder.

When enough pressure is applied on the corresponding engine parts, the engine begins to gain power through movement coming from direct force application. The aftermath of the entire compression process will lead to exhaustion of byproducts like carbon monoxide, carbon dioxide and nitrogen wastes. These gases are freely emitted into the atmosphere. The combustion process is started through engine ignition using the spark ignition method or the compression ignition system.

Where Does Gasoline Come In?

There are electric/gasoline-type systems that use a combination of lead-acid battery plus an induction coil to create a high-voltage electrical spark. The spark will then ignite the mix of air and fuel within the cylinder. The battery is rechargeable even during operation through an alternator or generator driven by the engine itself. Gasoline engines get an air and gasoline mixture to be compressed to less than 185 psi. The spark plug ignites the mixture during compression within the cylinder.

As for diesel engines, these require only heat and pressure produced by the engine during the compression process for ignition. Diesel compression is approximately three times higher compared to a gasoline engine. Diesel engines use air only. Some diesel fuel is sprayed into the cylinder with the use of a fuel injector just before peak compression to start ignition immediately. HCCI engines also require only heat and pressure but take in air and fuel. This process makes diesel and HCCI engines more prone to cold starts.

The Polluting Effects

Combustion products or the hot gases ignited and burnt inside the engine will have higher amounts of energy compared to the compressed fuel and air mixture. After available energy are used up to drive the engine pistons, remaining combustion products will be vented or exhausted through a valve or the exhaust outlet to bring back the piston in its original state also called TDC. Any heat which is not used up will become a waste product due to be removed from the engine via a liquid or air cooling system.

Air pollution emissions then result from incomplete combustion of carbonaceous fuel. Examples of engine byproducts are carbon monoxide, soot, nitrogen wastes, sulfur and uncombusted hydrocarbons. These also result if the products did not operate near the stoichiometric ratio required for effective combustion. The fuel would not have burnt very well due to factors like cool cylinder walls or lack of air. This is also known as quenching of the flame.

Both gasoline and diesel engines emit harmful gases that can be dangerous to humans as well as the environment. The greenhouse gases start trapping hot air within the atmosphere instead of allowing them to exit to space leading to global warming. The rise of the ICE or internal combustion engine finally showed its major flaw which is pollution.