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Originally, the gasoline engine used solely to prepare the carburettor mixture of air and gas. However, the relative imprecision This method has led to the development of direct fuel injection, resulting in more efficient combustion and lower emissions. Below I will explain how the system works as well as its advantages and disadvantages. It is likely that more vehicles will be built with this type of engine in the future, it is helpful to understand its operation.
How to Direct Fuel Injection Works
In most cars gasoline engine operates on a four-stroke cycle. In a four-stroke engine, during the first stage of the intake valve opens and the cylinder is filled with a mixture of gas and air. Then close the valves and the piston rises, compressing the mixture. After this happens, the ignition is triggered, sending down the piston in what is known as stroke. Finally, the exhaust valve opens and the piston moves upwards, forcing the fumes of the waste.
In a carbureted vehicle, the fuel mixture are mixed before entering in the cylinder on the first shot. With direct injection gas is sprayed into the cylinder while the air enters through the intake manifold.
Benefits
There are a number of advantages to a direct injection engine. The main advantages associated improved fuel economy and greater power output. Each burst of fuel is precisely measured and timed by the onboard computer, resulting in greater efficiency and less pollution. In addition, the ultra-fine droplets and even dispersion created by the system has a cooling effect on the engine which increases the power of the whole band system of the engine.
When it works, the computer continuously varies between the different air ratios gas to ensure optimum performance. The three modes are "full powers", "ultra-lean burn" and "equivalence". In a full to burn the mixture is richer, allowing the car to accelerate more quickly and prevent knock. Ultra lean burn "pushes rates as high as 65:1, that cutting emissions under situations of low stress. "Stoichometric mode turns the engine a 14.7:1 mixture, the optimum combination that guarantees 100% burn, used for situations of moderate stress.
Disadvantages
Unfortunately, direct injection systems are more expensive and complicated to build, resulting in a concentration among high performance cars and trucks. Another disadvantage of these systems is the durability of components. The Assembly should be able to handle gasoline high pressure and heat and cylinder pressure for long periods of time. In addition, the meeting must be very precise to guide the spray correctly. This tight tolerance can also be assembled unreliable, especially if the engine is routinely placed in situations of high stress or driven long distances.
Even if current prices remain relatively high for these systems, their performance and efficiency of fuel is likely to encourage their adoption in additional models of cars. Before long, the carburetors will be a distant memory.
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