Driverless cars Main article: Driverless car Fully autonomous vehicles, also known as robotic cars, or driverless cars, already exist in prototype, and are expected to be commercially available around 2020. According to urban designer and futurist Michael E. Arth, driverless electric free articles directory vehicles'in conjunction with the increased use of virtual reality for work, travel, and pleasure'could reduce the world's 800,000,000 vehicles to a fraction of that number within a few ...
Transportation is a major contributor to air pollution in most industrialised nations. According to the American Surface Transportation Policy Project nearly half of all Americans are breathing unhealthy air. Their study showed air quality in dozens of metropolitan areas has got worse over the last decade.[32] In the United States the average passenger car emits 11,450 lbs (5 tonnes) of carbon dioxide, along with smaller amounts of carbon monoxide, hydrocarbons, and nitrogen.[33] free articles
...
CostDue to the high compression ratios and resultinghigh cylinder pressure in diesel engines, theymust be built to withstand a lot more punishmentthan gas engines. The parts that are spruced upinclude a thicker block and cylinder heads, pistons, crankshaft, and valves, which can bevery costly indeed.When it comes to the price, gas wins this one byfar. Diesel costs a lot more to own than gas,which is one of the main reasons why people tendto choose gas over diesel.Fuel costDiesel fuel is ...
Gas engines are known as internal combustion enginesand are divided into two general classes, specificallytwo cycle and four cycle engines. A cycle of an engine represents one stroke of the piston or one half revolution of the crank shaft, as a completerevolution represents two cycles. With a two cycleengine, the power impulse occurs at each revolution,while with four cycle engines it occurs at everyother revolution, hence the terms two and four cycleengines.Both classes have their own ...
Diesel engines offer the lowest specific fuel usage of any other large internal combustion engine. Thefact remains, two-stroke diesels with high pressureforced induction, particularly turbo charging, make up a large percentage of the largest diesel engines.Throughout North America, diesel engines are generallyused in larger trucks, where the low stress, highefficiency cycle will lead to a much longer enginelife and lower costs to operate. These advantagesalso help to make the diesel engine ...
When gas is compressed, the temperature of it will rise,with diesel engines using this very property to ignitethe fuel. Air is then drawn into the cylinder andcompressed by the rising piston at a much highcompression ratio than gas engines, up to 25:1, withthe air temperature reaching 700 - 900 degrees C.At the top of the piston stroke, the diesel fuel isinjected into the combustion chamber at high pressure,then through an atomizing nozzle, it mixes with thehot high pressured air. The ...
With diesel engines, the compression ratio is higher and there is more power. From a technical point, thecompression ratio of an engine is the comparison of thetotal volume of the cylinder at the bottom of the piston's stroke divided by the volume of the cylinderremaining at the top of the stroke.Gasoline ratiosSerious damage to gas engines can occur if you attemptto run a high compression ratio with a low octane typeof fuel. Detonation is the ignition of the fuel dueto the high temperature ...
The major distinction between diesel and gas lies inthe type of ignition. While gas engines operate onspark ignition, diesel engines employ compressionignition for igniting the fuel. With compression, theair is drawn into the engine and subjected to highcompression that heats it up. The result is a veryhigh temperature in the engine, much high than thatof gas engines. In diesel engines, air and fuel are both infused intothe engine at different stages, as opposed to gas where a mixture ...
If you've owned a diesel powered vehicle in thepast or if you own one now, you no doubt appreciatethe qualities this engine provides you with. Moretorque, better fuel economy, and easier maintenanceare but a few of the attributes of owning dieselpowered vehicles. However, there are some motorists that stillcomplain about the engine's weak power, especiallywhen accelerating from a full stop. What youmay not be aware of is the fact that a diesel engine can be tweaked to give more power ...
